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Samaddar S, Rolandelli A, O'Neal AJ, Laukaitis-Yousey HJ, Marnin L, Singh N, Wang X, Butler LR, Rangghran P, Kitsou C, Cabrera Paz FE, Valencia L, R Ferraz C, Munderloh UG, Khoo B, Cull B, Rosche KL, Shaw DK, Oliver J, Narasimhan S, Fikrig E, Pal U, Fiskum GM, Polster BM, Pedra JHF. Bacterial reprogramming of tick metabolism impacts vector fitness and susceptibility to infection. Nat Microbiol 2024; 9:2278-2291. [PMID: 38997520 DOI: 10.1038/s41564-024-01756-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 06/11/2024] [Indexed: 07/14/2024]
Abstract
Arthropod-borne pathogens are responsible for hundreds of millions of infections in humans each year. The blacklegged tick, Ixodes scapularis, is the predominant arthropod vector in the United States and is responsible for transmitting several human pathogens, including the Lyme disease spirochete Borrelia burgdorferi and the obligate intracellular rickettsial bacterium Anaplasma phagocytophilum, which causes human granulocytic anaplasmosis. However, tick metabolic response to microbes and whether metabolite allocation occurs upon infection remain unknown. Here we investigated metabolic reprogramming in the tick ectoparasite I. scapularis and determined that the rickettsial bacterium A. phagocytophilum and the spirochete B. burgdorferi induced glycolysis in tick cells. Surprisingly, the endosymbiont Rickettsia buchneri had a minimal effect on bioenergetics. An unbiased metabolomics approach following A. phagocytophilum infection of tick cells showed alterations in carbohydrate, lipid, nucleotide and protein metabolism, including elevated levels of the pleiotropic metabolite β-aminoisobutyric acid. We manipulated the expression of genes associated with β-aminoisobutyric acid metabolism in I. scapularis, resulting in feeding impairment, diminished survival and reduced bacterial acquisition post haematophagy. Collectively, we discovered that metabolic reprogramming affects interspecies relationships and fitness in the clinically relevant tick I. scapularis.
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Affiliation(s)
- Sourabh Samaddar
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Agustin Rolandelli
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Anya J O'Neal
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
- Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Hanna J Laukaitis-Yousey
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Liron Marnin
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Nisha Singh
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
- Department of Biotechnology, School of Energy Technology, Pandit Deendayal Energy University; Knowledge Corridor, Gandhinagar, India
| | - Xiaowei Wang
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
- MP Biomedicals, Solon, OH, USA
| | - L Rainer Butler
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
- Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA
| | - Parisa Rangghran
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Chrysoula Kitsou
- Department of Veterinary Medicine, University of Maryland, College Park, MD, USA
| | - Francy E Cabrera Paz
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Luisa Valencia
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Camila R Ferraz
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | | | - Benedict Khoo
- Division of Environmental Health Sciences, University of Minnesota, Minneapolis, MN, USA
| | - Benjamin Cull
- Department of Entomology, University of Minnesota, Saint Paul, MN, USA
| | - Kristin L Rosche
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, USA
| | - Dana K Shaw
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, USA
| | - Jonathan Oliver
- Division of Environmental Health Sciences, University of Minnesota, Minneapolis, MN, USA
| | - Sukanya Narasimhan
- Department of Internal Medicine, Section of Infectious Diseases, Yale University School of Medicine, New Haven, CT, USA
| | - Erol Fikrig
- Department of Internal Medicine, Section of Infectious Diseases, Yale University School of Medicine, New Haven, CT, USA
| | - Utpal Pal
- Department of Veterinary Medicine, University of Maryland, College Park, MD, USA
| | - Gary M Fiskum
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Brian M Polster
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Joao H F Pedra
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD, USA.
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2
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Schulz NK, Asgari D, Liu S, Birnbaum SS, Williams AM, Prakash A, Tate AT. Resources modulate developmental shifts but not infection tolerance upon coinfection in an insect system. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.08.01.606236. [PMID: 39149267 PMCID: PMC11326177 DOI: 10.1101/2024.08.01.606236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
Energetic resources fuel immune responses and parasite growth within organisms, but it is unclear whether energy allocation is sufficient to explain changes in infection outcomes under the threat of multiple parasites. We manipulated diet in flour beetles (Tribolium confusum) infected with two natural parasites to investigate the role of resources in shifting metabolic and immune responses after single and co-infection. Our results suggest that gregarine parasites alter the within-host energetic environment, and by extension juvenile development time, in a diet-dependent manner. Gregarines do not affect host resistance to acute bacterial infection but do stimulate the expression of an alternative set of immune genes and promote damage to the gut, ultimately contributing to reduced survival regardless of diet. Thus, energy allocation is not sufficient to explain the immunological contribution to coinfection outcomes, emphasizing the importance of mechanistic insight for predicting the impact of coinfection across levels of biological organization.
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Affiliation(s)
- Nora K.E. Schulz
- Department of Biological Sciences, Vanderbilt University, Nashville TN 37232
| | - Danial Asgari
- Department of Biological Sciences, Vanderbilt University, Nashville TN 37232
| | - Siqin Liu
- Department of Biological Sciences, Vanderbilt University, Nashville TN 37232
| | | | - Alissa M. Williams
- Department of Biological Sciences, Vanderbilt University, Nashville TN 37232
| | - Arun Prakash
- Department of Biological Sciences, Vanderbilt University, Nashville TN 37232
| | - Ann T. Tate
- Department of Biological Sciences, Vanderbilt University, Nashville TN 37232
- Evolutionary Studies Initiative, Vanderbilt University, Nashville TN 37232
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3
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Dean AD, Childs DZ, Corripio‐Miyar Y, Evans M, Hayward A, Kenyon F, McNally L, McNeilly TN, Pakeman RJ, Sweeny AR, Nussey DH, Pedersen AB, Fenton A. Host resources and parasite traits interact to determine the optimal combination of host parasite-mitigation strategies. Ecol Evol 2024; 14:e11310. [PMID: 38903143 PMCID: PMC11187858 DOI: 10.1002/ece3.11310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 03/29/2024] [Accepted: 04/03/2024] [Indexed: 06/22/2024] Open
Abstract
Organisms have evolved diverse strategies to manage parasite infections. Broadly, hosts may avoid infection by altering behaviour, resist infection by targeting parasites or tolerate infection by repairing associated damage. The effectiveness of a strategy depends on interactions between, for example, resource availability, parasite traits (virulence, life-history) and the host itself (nutritional status, immunopathology). To understand how these factors shape host parasite-mitigation strategies, we developed a mathematical model of within-host, parasite-immune dynamics in the context of helminth infections. The model incorporated host nutrition and resource allocation to different mechanisms of immune response: larval parasite prevention; adult parasite clearance; damage repair (tolerance). We also considered a non-immune strategy: avoidance via anorexia, reducing intake of infective stages. Resources not allocated to immune processes promoted host condition, whereas harm due to parasites and immunopathology diminished it. Maximising condition (a proxy for fitness), we determined optimal host investment for each parasite-mitigation strategy, singly and combined, across different environmental resource levels and parasite trait values. Which strategy was optimal varied with scenario. Tolerance generally performed well, especially with high resources. Success of the different resistance strategies (larval prevention or adult clearance) tracked relative virulence of larval and adult parasites: slowly maturing, highly damaging larvae favoured prevention; rapidly maturing, less harmful larvae favoured clearance. Anorexia was viable only in the short term, due to reduced host nutrition. Combined strategies always outperformed any lone strategy: these were dominated by tolerance, with some investment in resistance. Choice of parasite mitigation strategy has profound consequences for hosts, impacting their condition, survival and reproductive success. We show that the efficacy of different strategies is highly dependent on timescale, parasite traits and resource availability. Models that integrate such factors can inform the collection and interpretation of empirical data, to understand how those drivers interact to shape host immune responses in natural systems.
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Affiliation(s)
- Andrew D. Dean
- Institute of Infection, Veterinary and Ecological SciencesUniversity of LiverpoolLiverpoolUK
| | | | | | - Mike Evans
- Department for Disease ControlMoredun Research InstitutePenicuikUK
- The University of Edinburgh Royal (Dick) School of Veterinary StudiesRoslinUK
- Institute of Ecology and Evolution, School of Biological SciencesUniversity of EdinburghEdinburghUK
| | - Adam Hayward
- Department for Disease ControlMoredun Research InstitutePenicuikUK
| | - Fiona Kenyon
- Department for Disease ControlMoredun Research InstitutePenicuikUK
| | - Luke McNally
- Institute of Ecology and Evolution, School of Biological SciencesUniversity of EdinburghEdinburghUK
| | - Tom N. McNeilly
- Department for Disease ControlMoredun Research InstitutePenicuikUK
| | | | - Amy R. Sweeny
- School of BiosciencesThe University of SheffieldSheffieldUK
- Institute of Ecology and Evolution, School of Biological SciencesUniversity of EdinburghEdinburghUK
| | - Daniel H. Nussey
- Institute of Ecology and Evolution, School of Biological SciencesUniversity of EdinburghEdinburghUK
| | - Amy B. Pedersen
- Institute of Ecology and Evolution, School of Biological SciencesUniversity of EdinburghEdinburghUK
| | - Andy Fenton
- Institute of Infection, Veterinary and Ecological SciencesUniversity of LiverpoolLiverpoolUK
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4
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Liao A, Cavigliasso F, Savary L, Kawecki TJ. Effects of an entomopathogenic fungus on the reproductive potential of Drosophila males. Ecol Evol 2024; 14:e11242. [PMID: 38590549 PMCID: PMC10999951 DOI: 10.1002/ece3.11242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 03/20/2024] [Accepted: 03/25/2024] [Indexed: 04/10/2024] Open
Abstract
While mortality is often the primary focus of pathogen virulence, non-lethal consequences, particularly for male reproductive fitness, are less understood; however, they are essential for understanding how sexual selection contributes to promoting resistance. We investigated how the fungal pathogen Metarhizium brunneum affects mating ability, fertility, and seminal fluid protein (SFP) expression of male Drosophila melanogaster paired with highly receptive virgin females in non-competitive settings. Depending on sex and dose, there was a 3-6-day incubation period after infection, followed by an abrupt onset of mortality. Meanwhile, the immune response was strongly induced already 38 h after infection and continued to increase as infection progressed. Latency to mate somewhat increased during the incubation period compared to sham-treated males, but even on Day 5 post infection >90% of infected males mated within 2 h. During the incubation period, M. brunneum infection reduced male reproductive potential (the number of offspring sired without mate limitation) by 11%, with no clear increase over time. Approaching the end of the incubation period, infected males had lower ability to convert number of mating opportunities into number of offspring. After repeated mating, infected males had lower SFP expression than sham controls, more so in males that mated with few mates 24 h earlier. Overall, despite strong activation of the immune response, males' mating ability and fertility remained surprisingly little affected by the fungal infection, even shortly before the onset of mortality. This suggests that the selection for resistance acts mainly through mortality, and the scope for fertility selection to enhance resistance in non-competing settings is rather limited.
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Affiliation(s)
- Aijuan Liao
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
| | - Fanny Cavigliasso
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
| | - Loriane Savary
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
| | - Tadeusz J. Kawecki
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
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5
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Perlmutter JI, Chapman JR, Wilkinson MC, Nevarez-Saenz I, Unckless RL. A single amino acid polymorphism in natural Metchnikowin alleles of Drosophila results in systemic immunity and life history tradeoffs. PLoS Genet 2024; 20:e1011155. [PMID: 38466751 PMCID: PMC10957085 DOI: 10.1371/journal.pgen.1011155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 03/21/2024] [Accepted: 01/26/2024] [Indexed: 03/13/2024] Open
Abstract
Antimicrobial peptides (AMPs) are at the interface of interactions between hosts and microbes and are therefore expected to be rapidly evolving in a coevolutionary arms race with pathogens. In contrast, previous work demonstrated that insect AMPs tend to evolve more slowly than the genome average. Metchikowin (Mtk) is a Drosophila AMP that has a single amino acid residue that segregates as either proline (P) or arginine (R) in populations of four different species, some of which diverged more than 10 million years ago. These results suggest that there is a distinct functional importance to each allele. The most likely hypotheses are driven by two main questions: does each allele have a different efficacy against different specific pathogens (specificity hypothesis)? Or, is one allele a more potent antimicrobial, but with a host fitness cost (autoimmune hypothesis)? To assess their functional differences, we created D. melanogaster lines with the P allele, R allele, or Mtk null mutation using CRISPR/Cas9 genome editing and performed a series of life history and infection assays to assess them. In males, testing of systemic immune responses to a repertoire of bacteria and fungi demonstrated that the R allele performs as well or better than the P and null alleles with most infections. Females show some results that contrast with males, with Mtk alleles either not contributing to survival or with the P allele outperforming the R allele. In addition, measurements of life history traits demonstrate that the R allele is more costly in the absence of infection for both sexes. These results are consistent with both the specificity hypothesis (either allele can perform better against certain pathogens depending on context), and the autoimmune hypothesis (the R allele is generally the more potent antimicrobial in males, and carries a fitness cost). These results provide strong in vivo evidence that differential fitness with or without infection and sex-based functional differences in alleles may be adaptive mechanisms of maintaining immune gene polymorphisms in contrast with expectations of rapid evolution. Therefore, a complex interplay of forces including pathogen species and host sex may lead to balancing selection for immune genotypes. Strikingly, this selection may act on even a single amino acid polymorphism in an AMP.
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Affiliation(s)
- Jessamyn I. Perlmutter
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Joanne R. Chapman
- Institute of Environmental and Scientific Research (ESR), Christchurch, New Zealand
| | - Mason C. Wilkinson
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Isaac Nevarez-Saenz
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Robert L. Unckless
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
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Hammel M, Touchard F, Burioli EAV, Paradis L, Cerqueira F, Chailler E, Bernard I, Cochet H, Simon A, Thomas F, Destoumieux-Garzón D, Charrière GM, Bierne N. Marine transmissible cancer navigates urbanized waters, threatening spillover. Proc Biol Sci 2024; 291:20232541. [PMID: 38378149 PMCID: PMC10878816 DOI: 10.1098/rspb.2023.2541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 01/22/2024] [Indexed: 02/22/2024] Open
Abstract
Inter-individual transmission of cancer cells represents a unique form of microparasites increasingly reported in marine bivalves. In this study, we sought to understand the ecology of the propagation of Mytilus trossulus Bivalve Transmissible Neoplasia 2 (MtrBTN2), a transmissible cancer affecting four Mytilus mussel species worldwide. We investigated the prevalence of MtrBTN2 in the mosaic hybrid zone of M. edulis and M. galloprovincialis along the French Atlantic coast, sampling contrasting natural and anthropogenic habitats. We observed a similar prevalence in both species, probably due to the spatial proximity of the two species in this region. Our results showed that ports had higher prevalence of MtrBTN2, with a possible hotspot observed at a shuttle landing dock. No cancer was found in natural beds except for two sites close to the hotspot, suggesting spillover. Ports may provide favourable conditions for the transmission of MtrBTN2, such as high mussel density, stressful conditions, sheltered and confined shores or buffered temperatures. Ships may also spread the disease through biofouling. Our results suggest ports may serve as epidemiological hubs, with maritime routes providing artificial gateways for MtrBTN2 propagation. This highlights the importance of preventing biofouling on docks and ship hulls to limit the spread of marine pathogens hosted by fouling species.
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Affiliation(s)
- M. Hammel
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - F. Touchard
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - E. A. V. Burioli
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - L. Paradis
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - F. Cerqueira
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - E. Chailler
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | | | - H. Cochet
- Cochet Environnement, 56550 Locoal, France
| | - A. Simon
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - F. Thomas
- CREEC/CANECEV (CREES), MIVEGEC, Unité Mixte de Recherches, IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
| | - D. Destoumieux-Garzón
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - G. M. Charrière
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - N. Bierne
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
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7
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Robison-Smith C, Masud N, Tarring EC, Ward BD, Cable J. A class of their own? Water-soluble polymer pollution impacting a freshwater host-pathogen system. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:168086. [PMID: 37890633 DOI: 10.1016/j.scitotenv.2023.168086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/29/2023] [Accepted: 10/22/2023] [Indexed: 10/29/2023]
Abstract
While the inclusion of synthetic polymers such as primary microplastics within personal care products have been widely restricted under EU/UK Law, water-soluble polymers (WSPs) have so far slipped the net of global chemical regulation despite evidence that these could be polluting wastewater effluents at concentrations greatly exceeding those of microplastics. Polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) represent WSPs with common industry and household uses, down-the-drain disposal and a direct route to wastewater treatment plants, conveying high risk of environmental leaching into freshwater ecosystems. The current study is the first investigating the impacts of predicted environmental concentrations of these WSPs on life-history traits of two freshwater species also constituting a disease model (fish - Poecilia reticulata and parasite - Gyrodactylus turnbulli). Single effects of WSPs on fish as well as their interactive effects with infection of the ectoparasite were determined over a 45-day exposure. Generally, WSPs reduced fish growth and increased routine metabolic rate of fish implying a depleted energetic budget, however these effects were dose, exposure time and polymer dependent. Parasitic infection alone caused a significant reduction in fish growth and enhanced fish routine metabolic rate. In contrast, a non-additive effect on metabolic rate was evident in fish experiencing simultaneous infection and WSP exposure, suggesting a protective effect of the two WSPs for fish also exposed to a metazoan ectoparasite. Off-host parasite survival was significantly lowered by both WSPs; however, parasite counts of infected fish also exposed to WSP were not significantly different from the control, implying more complex mechanisms may underpin this stressor interaction. Distinct detrimental impacts were inflicted on both organisms implying environmental leaching of WSPs may be causing significant disruption to interspecies interactions within freshwater ecosystems. Additionally, these results could contribute to sustainable development in industry, as we conclude PVA represents a less harmful alternative to PVP.
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Affiliation(s)
| | - Numair Masud
- School of Biosciences, Cardiff University, CF10 3AX, UK
| | - Eve C Tarring
- School of Chemistry, Cardiff University, CF10 3AT, UK
| | | | - Jo Cable
- School of Biosciences, Cardiff University, CF10 3AX, UK
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8
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Van de Waal DB, White LA, Everett R, Asik L, Borer ET, Frenken T, González AL, Paseka R, Seabloom EW, Strauss AT, Peace A. Reconciling contrasting effects of nitrogen on host immunity and pathogen transmission using stoichiometric models. Ecology 2023; 104:e4170. [PMID: 37755721 DOI: 10.1002/ecy.4170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 06/10/2023] [Accepted: 07/29/2023] [Indexed: 09/28/2023]
Abstract
Hosts rely on the availability of nutrients for growth, and for defense against pathogens. At the same time, changes in host nutrition can alter the dynamics of pathogens that rely on their host for reproduction. For primary producer hosts, enhanced nutrient loads may increase host biomass or pathogen reproduction, promoting faster density-dependent pathogen transmission. However, the effect of elevated nutrients may be reduced if hosts allocate a growth-limiting nutrient to pathogen defense. In canonical disease models, transmission is not a function of nutrient availability. Yet, including nutrient availability is necessary to mechanistically understand the response of infection to changes in the environment. Here, we explore the implications of nutrient-mediated pathogen infectivity and host immunity on infection outcomes. We developed a stoichiometric disease model that explicitly integrates the contrasting dependencies of pathogen infectivity and host immunity on nitrogen (N) and parameterized it for an algal-host system. Our findings reveal dynamic shifts in host biomass build-up, pathogen prevalence, and the force of infection along N supply gradients with N-mediated host infectivity and immunity, compared with a model in which the transmission rate was fixed. We show contrasting responses in pathogen performance with increasing N supply between N-mediated infectivity and N-mediated immunity, revealing an optimum for pathogen transmission at intermediate N supply. This was caused by N limitation of the pathogen at a low N supply and by pathogen suppression via enhanced host immunity at a high N supply. By integrating both nutrient-mediated pathogen infectivity and host immunity into a stoichiometric model, we provide a theoretical framework that is a first step in reconciling the contrasting role nutrients can have on host-pathogen dynamics.
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Affiliation(s)
- Dedmer B Van de Waal
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
- Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands
| | - Lauren A White
- National Socio-Environmental Synthesis Center (SESYNC), University of Maryland, Annapolis, Maryland, USA
| | - Rebecca Everett
- Department of Mathematics and Statistics, Haverford College, Haverford, Pennsylvania, USA
| | - Lale Asik
- Department of Mathematics and Statistics, University of the Incarnate Word, San Antonio, Texas, USA
- Department of Mathematics and Statistics, Texas Tech University, Lubbock, Texas, USA
| | - Elizabeth T Borer
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, USA
| | - Thijs Frenken
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
- Great Lakes Institute for Environmental Research (GLIER), University of Windsor, Windsor, Ontario, Canada
| | - Angélica L González
- Department of Biology and Center for Computational and Integrative Biology, Rutgers University, Camden, New Jersey, USA
| | - Rachel Paseka
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, USA
| | - Eric W Seabloom
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, USA
| | - Alexander T Strauss
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, USA
- Odum School of Ecology, University of Georgia, Athens, Georgia, USA
- River Basin Center, University of Georgia, Athens, Georgia, USA
- Center for the Ecology of Infectious Diseases, University of Georgia, Athens, Georgia, USA
| | - Angela Peace
- Department of Mathematics and Statistics, Texas Tech University, Lubbock, Texas, USA
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9
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Vicente-Santos A, Willink B, Nowak K, Civitello DJ, Gillespie TR. Host-pathogen interactions under pressure: A review and meta-analysis of stress-mediated effects on disease dynamics. Ecol Lett 2023; 26:2003-2020. [PMID: 37804128 PMCID: PMC10874615 DOI: 10.1111/ele.14319] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 09/07/2023] [Accepted: 09/12/2023] [Indexed: 10/08/2023]
Abstract
Human activities have increased the intensity and frequency of natural stressors and created novel stressors, altering host-pathogen interactions and changing the risk of emerging infectious diseases. Despite the ubiquity of such anthropogenic impacts, predicting the directionality of outcomes has proven challenging. Here, we conduct a review and meta-analysis to determine the primary mechanisms through which stressors affect host-pathogen interactions and to evaluate the impacts stress has on host fitness (survival and fecundity) and pathogen infectivity (prevalence and intensity). We assessed 891 effect sizes from 71 host species (representing seven taxonomic groups) and 78 parasite taxa from 98 studies. We found that infected and uninfected hosts had similar sensitivity to stressors and that responses varied according to stressor type. Specifically, limited resources compromised host fecundity and decreased pathogen intensity, while abiotic environmental stressors (e.g., temperature and salinity) decreased host survivorship and increased pathogen intensity, and pollution increased mortality but decreased pathogen prevalence. We then used our meta-analysis results to develop susceptible-infected theoretical models to illustrate scenarios where infection rates are expected to increase or decrease in response to resource limitations or environmental stress gradients. Our results carry implications for conservation and disease emergence and reveal areas for future work.
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Affiliation(s)
- Amanda Vicente-Santos
- Population Biology, Ecology, and Evolution Program, Emory University, Atlanta, GA 30322, USA
| | - Beatriz Willink
- Department of Zoology, Stockholm University, Stockholm 106-91, Sweden
- Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore
- School of Biology, University of Costa Rica, San José 11501-2060, Costa Rica
| | - Kacy Nowak
- Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
| | - David J. Civitello
- Population Biology, Ecology, and Evolution Program, Emory University, Atlanta, GA 30322, USA
- Department of Biology, Emory University, Atlanta, GA 30322, USA
| | - Thomas R. Gillespie
- Population Biology, Ecology, and Evolution Program, Emory University, Atlanta, GA 30322, USA
- Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
- Department of Environmental Sciences, Emory University, Atlanta, GA 30322, USA
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10
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Krichel L, Kirk D, Pencer C, Hönig M, Wadhawan K, Krkošek M. Short-term temperature fluctuations increase disease in a Daphnia-parasite infectious disease system. PLoS Biol 2023; 21:e3002260. [PMID: 37683040 PMCID: PMC10491407 DOI: 10.1371/journal.pbio.3002260] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 07/18/2023] [Indexed: 09/10/2023] Open
Abstract
Climate change has profound effects on infectious disease dynamics, yet the impacts of increased short-term temperature fluctuations on disease spread remain poorly understood. We empirically tested the theoretical prediction that short-term thermal fluctuations suppress endemic infection prevalence at the pathogen's thermal optimum. This prediction follows from a mechanistic disease transmission model analyzed using stochastic simulations of the model parameterized with thermal performance curves (TPCs) from metabolic scaling theory and using nonlinear averaging, which predicts ecological outcomes consistent with Jensen's inequality (i.e., reduced performance around concave-down portions of a thermal response curve). Experimental observations of replicated epidemics of the microparasite Ordospora colligata in Daphnia magna populations indicate that temperature variability had the opposite effect of our theoretical predictions and instead increase endemic infection prevalence. This positive effect of temperature variability is qualitatively consistent with a published hypothesis that parasites may acclimate more rapidly to fluctuating temperatures than their hosts; however, incorporating hypothetical effects of delayed host acclimation into the mechanistic transmission model did not fully account for the observed pattern. The experimental data indicate that shifts in the distribution of infection burden underlie the positive effect of temperature fluctuations on endemic prevalence. The increase in disease risk associated with climate fluctuations may therefore result from disease processes interacting across scales, particularly within-host dynamics, that are not captured by combining standard transmission models with metabolic scaling theory.
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Affiliation(s)
- Leila Krichel
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada
| | - Devin Kirk
- Department of Biology, Stanford University, Stanford, California, United States of America
| | - Clara Pencer
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada
| | - Madison Hönig
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada
- Department of Anthropology, Washington State University, Pullman, Washington, United States of America
| | - Kiran Wadhawan
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada
- School of Biological Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Martin Krkošek
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada
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11
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Tang R, Tan H, Dai Y, Li L, Huang Y, Yao H, Cai Y, Yu G. Application of antimicrobial peptides in plant protection: making use of the overlooked merits. FRONTIERS IN PLANT SCIENCE 2023; 14:1139539. [PMID: 37538059 PMCID: PMC10394246 DOI: 10.3389/fpls.2023.1139539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 04/07/2023] [Indexed: 08/05/2023]
Abstract
Pathogen infection is one of the major causes of yield loss in the crop field. The rapid increase of antimicrobial resistance in plant pathogens has urged researchers to develop both new pesticides and management strategies for plant protection. The antimicrobial peptides (AMPs) showed potential on eliminating plant pathogenic fungi and bacteria. Here, we first summarize several overlooked advantages and merits of AMPs, which includes the steep dose-response relations, fast killing ability, broad synergism, slow resistance selection. We then discuss the possible application of AMPs for plant protection with above merits, and highlight how AMPs can be incorporated into a more efficient integrated management system that both increases the crop yield and reduce resistance evolution of pathogens.
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12
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Douchet P, Gourbal B, Loker ES, Rey O. Schistosoma transmission: scaling-up competence from hosts to ecosystems. Trends Parasitol 2023; 39:563-574. [PMID: 37120369 PMCID: PMC10880732 DOI: 10.1016/j.pt.2023.04.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/28/2023] [Accepted: 04/04/2023] [Indexed: 05/01/2023]
Abstract
In a One-Health context, it is urgent to establish the links between environmental degradation, biodiversity loss, and the circulation of pathogens. Here we review and literally draw a general vision of aquatic environmental factors that interface with Schistosoma species, agents of schistosomiasis, and ultimately modulate their transmission at the ecosystem scale. From this synthesis, we introduce the concept of ecosystem competence defined as 'the propensity of an ecosystem to amplify or mitigate an incoming quantity of a given pathogen that can be ultimately transmitted to their definitive hosts'. Ecosystem competence integrates all mechanisms at the ecosystem scale underlying the transmission risk of a given pathogen and offers a promising measure for operationalizing the One-Health concept.
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Affiliation(s)
- Philippe Douchet
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Perpignan, France
| | - Benjamin Gourbal
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Perpignan, France
| | - Eric S Loker
- Center for Evolutionary and Theoretical Immunology (CETI), Parasite Division - Museum of Southwestern Biology, Department of Biology, University of New Mexico, Albuquerque, NM, USA
| | - Olivier Rey
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Perpignan, France.
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13
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Borer ET, Kendig AE, Holt RD. Feeding the fever: Complex host-pathogen dynamics along continuous resource gradients. Ecol Evol 2023; 13:e10315. [PMID: 37502304 PMCID: PMC10368943 DOI: 10.1002/ece3.10315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Accepted: 07/04/2023] [Indexed: 07/29/2023] Open
Abstract
Food has long been known to perform dual functions of nutrition and medicine, but mounting evidence suggests that complex host-pathogen dynamics can emerge along continuous resource gradients. Empirical examples of nonmonotonic responses of infection with increasing host resources (e.g., low prevalence at low and high resource supply but high prevalence at intermediate resources) have been documented across the tree of life, but these dynamics, when observed, often are interpreted as nonintuitive, idiosyncratic features of pathogen and host biology. Here, by developing generalized versions of existing models of resource dependence for within- and among-host infection dynamics, we provide a synthetic view of nonmonotonic infection dynamics. We demonstrate that where resources jointly impact two (or more) processes (e.g., growth, defense, transmission, mortality, predation), nonmonotonic infection dynamics, including alternative states, can emerge across a continuous resource supply gradient. We review the few empirical examples that concurrently measured resource effects on multiple rates and pair this with a wide range of examples in which resource dependence of multiple rates could generate nonmonotonic infection outcomes under realistic conditions. This review and generalized framework highlight the likely generality of such resource effects in natural systems and point to opportunities ripe for future empirical and theoretical work.
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Affiliation(s)
- Elizabeth T. Borer
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSaint PaulMinnesotaUSA
| | - Amy E. Kendig
- Agronomy DepartmentUniversity of FloridaGainesvilleFloridaUSA
- Minnesota Department of Natural ResourcesMinnesota Biological SurveySaint PaulMinnesotaUSA
| | - Robert D. Holt
- Department of BiologyUniversity of FloridaGainesvilleFloridaUSA
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14
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Samaddar S, O’Neal AJ, Marnin L, Rolandelli A, Singh N, Wang X, Butler LR, Rangghran P, Laukaitis HJ, Cabrera Paz FE, Fiskum GM, Polster BM, Pedra JHF. Metabolic disruption impacts tick fitness and microbial relationships. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.26.542501. [PMID: 37292783 PMCID: PMC10245996 DOI: 10.1101/2023.05.26.542501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Arthropod-borne microbes rely on the metabolic state of a host to cycle between evolutionarily distant species. For instance, arthropod tolerance to infection may be due to redistribution of metabolic resources, often leading to microbial transmission to mammals. Conversely, metabolic alterations aids in pathogen elimination in humans, who do not ordinarily harbor arthropod-borne microbes. To ascertain the effect of metabolism on interspecies relationships, we engineered a system to evaluate glycolysis and oxidative phosphorylation in the tick Ixodes scapularis. Using a metabolic flux assay, we determined that the rickettsial bacterium Anaplasma phagocytophilum and the Lyme disease spirochete Borrelia burgdorferi, which are transstadially transmitted in nature, induced glycolysis in ticks. On the other hand, the endosymbiont Rickettsia buchneri, which is transovarially maintained, had a minimal effect on I. scapularis bioenergetics. Importantly, the metabolite β-aminoisobutyric acid (BAIBA) was elevated during A. phagocytophilum infection of tick cells following an unbiased metabolomics approach. Thus, we manipulated the expression of genes associated with the catabolism and anabolism of BAIBA in I. scapularis and detected impaired feeding on mammals, reduced bacterial acquisition, and decreased tick survival. Collectively, we reveal the importance of metabolism for tick-microbe relationships and unveil a valuable metabolite for I. scapularis fitness.
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Affiliation(s)
- Sourabh Samaddar
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Anya J. O’Neal
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Liron Marnin
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Agustin Rolandelli
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Nisha Singh
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Xiaowei Wang
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - L. Rainer Butler
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Parisa Rangghran
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, MD 21201, USA
| | - Hanna J. Laukaitis
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Francy E. Cabrera Paz
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
| | - Gary M. Fiskum
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, MD 21201, USA
| | - Brian M. Polster
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research, School of Medicine, University of Maryland, Baltimore, MD 21201, USA
| | - Joao H. F. Pedra
- Department of Microbiology and Immunology, University of Maryland, School of Medicine, Baltimore, Maryland 21201, USA
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15
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Imrie RM, Walsh SK, Roberts KE, Lello J, Longdon B. Investigating the outcomes of virus coinfection within and across host species. PLoS Pathog 2023; 19:e1011044. [PMID: 37216391 DOI: 10.1371/journal.ppat.1011044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 05/02/2023] [Indexed: 05/24/2023] Open
Abstract
Interactions between coinfecting pathogens have the potential to alter the course of infection and can act as a source of phenotypic variation in susceptibility between hosts. This phenotypic variation may influence the evolution of host-pathogen interactions within host species and interfere with patterns in the outcomes of infection across host species. Here, we examine experimental coinfections of two Cripaviruses-Cricket Paralysis Virus (CrPV), and Drosophila C Virus (DCV)-across a panel of 25 Drosophila melanogaster inbred lines and 47 Drosophilidae host species. We find that interactions between these viruses alter viral loads across D. melanogaster genotypes, with a ~3 fold increase in the viral load of DCV and a ~2.5 fold decrease in CrPV in coinfection compared to single infection, but we find little evidence of a host genetic basis for these effects. Across host species, we find no evidence of systematic changes in susceptibility during coinfection, with no interaction between DCV and CrPV detected in the majority of host species. These results suggest that phenotypic variation in coinfection interactions within host species can occur independently of natural host genetic variation in susceptibility, and that patterns of susceptibility across host species to single infections can be robust to the added complexity of coinfection.
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Affiliation(s)
- Ryan M Imrie
- Centre for Ecology & Conservation, Faculty of Environment, Science, and Economy, Biosciences, University of Exeter, Penryn Campus, Penryn, United Kingdom
| | - Sarah K Walsh
- Centre for Ecology & Conservation, Faculty of Environment, Science, and Economy, Biosciences, University of Exeter, Penryn Campus, Penryn, United Kingdom
| | - Katherine E Roberts
- Centre for Ecology & Conservation, Faculty of Environment, Science, and Economy, Biosciences, University of Exeter, Penryn Campus, Penryn, United Kingdom
| | - Joanne Lello
- School of Biosciences, Cardiff University, Cardiff, United Kingdom
| | - Ben Longdon
- Centre for Ecology & Conservation, Faculty of Environment, Science, and Economy, Biosciences, University of Exeter, Penryn Campus, Penryn, United Kingdom
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16
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King KC, Hall MD, Wolinska J. Infectious disease ecology and evolution in a changing world. Philos Trans R Soc Lond B Biol Sci 2023; 378:20220002. [PMID: 36744560 PMCID: PMC9900701 DOI: 10.1098/rstb.2022.0002] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 01/13/2023] [Indexed: 02/07/2023] Open
Affiliation(s)
- Kayla C. King
- Department of Biology, University of Oxford, Oxford OX1 3SZ, UK
| | - Matthew D. Hall
- School of Biological Sciences, Monash University, Melbourne 3800, Australia
| | - Justyna Wolinska
- Department of Evolutionary and Integrative Ecology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), 12587 Berlin, Germany
- Department of Biology, Chemistry, and Pharmacy, Institute of Biology, Freie Universität Berlin (FU), 14195 Berlin, Germany
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17
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Ramesh A, Hall SR. Niche theory for within-host parasite dynamics: Analogies to food web modules via feedback loops. Ecol Lett 2023; 26:351-368. [PMID: 36632705 DOI: 10.1111/ele.14142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 03/14/2022] [Accepted: 03/18/2022] [Indexed: 01/13/2023]
Abstract
Why do parasites exhibit a wide dynamical range within their hosts? For instance, why does infecting dose either lead to infection or immune clearance? Why do some parasites exhibit boom-bust, oscillatory dynamics? What maintains parasite diversity, that is coinfection v single infection due to exclusion or priority effects? For insights on parasite dose, dynamics and diversity governing within-host infection, we turn to niche models. An omnivory food web model (IGP) blueprints one parasite competing with immune cells for host energy (PIE). Similarly, a competition model (keystone predation, KP) mirrors a new coinfection model (2PIE). We then drew analogies between models using feedback loops. The following three points arise: first, like in IGP, parasites oscillate when longer loops through parasites, immune cells and resource regulate parasite growth. Shorter, self-limitation loops (involving resources and enemies) stabilise those oscillations. Second, IGP can produce priority effects that resemble immune clearance. But, despite comparable loop structure, PIE cannot due to constraints imposed by production of immune cells. Third, despite somewhat different loop structure, KP and 2PIE share apparent and resource competition mechanisms that produce coexistence (coinfection) or priority effects of prey or parasites. Together, this mechanistic niche framework for within-host dynamics offers new perspective to improve individual health.
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18
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Perlmutter JI, Chapman JR, Wilkinson MC, Nevarez-Saenz I, Unckless RL. A single amino acid polymorphism in natural Metchnikowin alleles of Drosophila results in systemic immunity and life history tradeoffs. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.16.524277. [PMID: 36712113 PMCID: PMC9882182 DOI: 10.1101/2023.01.16.524277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Antimicrobial peptides (AMPs) are at the interface of interactions between hosts and microbes and are therefore expected to be fast evolving in a coevolutionary arms race with pathogens. In contrast, previous work demonstrated that one AMP, Metchikowin (Mtk), has a single residue that segregates as either proline (P) or arginine (R) in populations of four different Drosophila species, some of which diverged more than 10 million years ago. The recurrent finding of this polymorphism regardless of geography or host species, coupled with evidence of balancing selection in Drosophila AMPs, suggest there is a distinct functional importance to each allele. The most likely hypotheses involve alleles having specificity to different pathogens or the more potent allele conferring a cost on the host. To assess their functional differences, we created D. melanogaster lines with the P allele, R allele, or Mtk null mutation using CRISPR/Cas9 genome editing. Here, we report results from experiments assessing the two hypotheses using these lines. In males, testing of systemic immune responses to a repertoire of bacteria and fungi demonstrated that the R allele performs as well or better than the P and null alleles with most infections. With some pathogens, however, females show results in contrast with males where Mtk alleles either do not contribute to survival or where the P allele outperforms the R allele. In addition, measurements of life history traits demonstrate that the R allele is more costly in the absence of infection for both sexes. These results provide strong in vivo evidence that differential fitness with or without infection and sex-based functional differences in alleles may be adaptive mechanisms of maintaining immune gene polymorphisms in contrast with expectations of rapid evolution. Therefore, a complex interplay of forces including pathogen species and host sex may lead to balancing selection for immune genotypes. Strikingly, this selection may act on even a single amino acid polymorphism in an AMP.
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Affiliation(s)
| | - Joanne R. Chapman
- Institute of Environmental and Scientific Research (ESR), Christchurch, New Zealand
| | - Mason C. Wilkinson
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Isaac Nevarez-Saenz
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
| | - Robert L. Unckless
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, USA
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19
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Westphal GH, Stewart Merrill TE. Partitioning variance in immune traits in a zooplankton host-Fungal parasite system. Ecol Evol 2022; 12:e9640. [PMID: 36545366 PMCID: PMC9763022 DOI: 10.1002/ece3.9640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 11/21/2022] [Accepted: 11/29/2022] [Indexed: 12/24/2022] Open
Abstract
Host immune traits arise from both genetic and environmental sources of variation. When immune traits have a strong genetic basis, the presence and severity of disease in a population may influence the distribution of those traits. Our study addressed how two immune-related traits (gut penetrability and the hemocyte response) are shaped by genetic and environmental sources of variation, and how the presence of a virulent disease altered the relative frequency of these traits in natural populations. Daphnia dentifera hosts were sampled from five Indiana lakes between June and December 2017 before and during epidemics of their fungal pathogen, Metschnikowia bicuspidata. Collected Daphnia were experimentally exposed to Metschnikowia and assayed for their gut penetrability, hemocyte response, and multi-locus genotype. Mixed-effects models were constructed to partition variance in immune traits between genetic and environmental sources. We then isolated the genetic sources to produce genotype-specific estimates of immune traits for each multi-locus genotype. Finally, we assessed the relative frequency and dynamics of genotypes during epidemics and asked whether genotypes with more robust immune responses increased in frequency during epidemics. Although genotype was an important source of variation for both gut penetrability and the hemocyte response, environmental factors (e.g., resource availability, Metschnikowia prevalence, and co-infection) still explained a large portion of observed variation, suggesting a high degree of flexibility in Daphnia immune traits. Additionally, no significant associations were detected between a genotype's immune traits and its frequency in a population. Our study highlights the power of variance partitioning in understanding the factors driving variation in Daphnia traits and motivates further research on immunological flexibility and the ecological drivers of immune variation.
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Affiliation(s)
- Grace H. Westphal
- School of Integrative BiologyUniversity of Illinois Urbana‐ChampaignChampaignIllinoisUSA,Department of Biological ScienceFlorida State UniversityTallahasseeFloridaUSA
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20
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Dai D, Yang J, Wu Y, Zhang W, Wu X, Liu Y, Xing H, Liu Y. Correlation between fine root traits and pathogen richness depends on plant mycorrhizal types. OIKOS 2022. [DOI: 10.1111/oik.09354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dong Dai
- ECNU‐Alberta Joint Lab for Biodiversity Study, Tiantong Forest Ecosystem National Observation and Research Station, School of Ecology and Environmental Sciences, East China Normal Univ. Shanghai China
| | - Jiarong Yang
- ECNU‐Alberta Joint Lab for Biodiversity Study, Tiantong Forest Ecosystem National Observation and Research Station, School of Ecology and Environmental Sciences, East China Normal Univ. Shanghai China
| | - Yougui Wu
- Fengyangshan‐Baishanzu National Nature Reserve Zhejiang Province China
| | - Wenhua Zhang
- ECNU‐Alberta Joint Lab for Biodiversity Study, Tiantong Forest Ecosystem National Observation and Research Station, School of Ecology and Environmental Sciences, East China Normal Univ. Shanghai China
| | - Xian Wu
- ECNU‐Alberta Joint Lab for Biodiversity Study, Tiantong Forest Ecosystem National Observation and Research Station, School of Ecology and Environmental Sciences, East China Normal Univ. Shanghai China
| | - Yajing Liu
- ECNU‐Alberta Joint Lab for Biodiversity Study, Tiantong Forest Ecosystem National Observation and Research Station, School of Ecology and Environmental Sciences, East China Normal Univ. Shanghai China
| | - Hua Xing
- ECNU‐Alberta Joint Lab for Biodiversity Study, Tiantong Forest Ecosystem National Observation and Research Station, School of Ecology and Environmental Sciences, East China Normal Univ. Shanghai China
| | - Yu Liu
- ECNU‐Alberta Joint Lab for Biodiversity Study, Tiantong Forest Ecosystem National Observation and Research Station, School of Ecology and Environmental Sciences, East China Normal Univ. Shanghai China
- Shanghai Inst. of Pollution Control and Ecological Security Shanghai China
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21
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Starkloff NC, Hartman RB, Civitello DJ. Snail juvenile growth rate as a rapid predictor of the transmission potential of parasitizing human schistosomes. Exp Parasitol 2022; 242:108378. [PMID: 36096192 DOI: 10.1016/j.exppara.2022.108378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 08/24/2022] [Accepted: 09/06/2022] [Indexed: 11/04/2022]
Abstract
Host and parasite traits that are sensitive to environmental perturbations merit special attention in the mitigation of diseases. While life table experiments allow a practical evaluation of variability of these traits with environmental change, they are cost and resource intensive. Here, we use a model snail host-trematode parasite system to test the efficacy of an expeditious alternative. Rapidly changing host traits (such as juvenile growth rate) can be used as effective predictors of parasite transmission potential across a range of environmental factors. This approach can be applied to anticipate epidemiological changes under diverse environmental scenarios.
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Affiliation(s)
| | - Rachel B Hartman
- Department of Biology, Emory University, Atlanta, GA, 30322, USA
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22
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Douhard F, Doeschl‐Wilson AB, Corbishley A, Hayward AD, Marcon D, Weisbecker J, Aguerre S, Bordes L, Jacquiet P, McNeilly TN, Sallé G, Moreno‐Romieux C. The cost of host genetic resistance on body condition: Evidence from divergently selected sheep. Evol Appl 2022; 15:1374-1389. [PMID: 36187187 PMCID: PMC9488686 DOI: 10.1111/eva.13442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/16/2022] [Accepted: 06/19/2022] [Indexed: 11/26/2022] Open
Abstract
Trade-offs between host resistance to parasites and host growth or reproduction can occur due to allocation of limited available resources between competing demands. To predict potential trade-offs arising from genetic selection for host resistance, a better understanding of the associated nutritional costs is required. Here, we studied resistance costs by using sheep from lines divergently selected on their resistance to a common blood-feeding gastro-intestinal parasite (Haemonchus contortus). First, we assessed the effects of selection for high or low host resistance on condition traits (body weight, back fat, and muscle thickness) and infection traits (parasite fecal egg excretion and loss in blood haematocrit) at various life stages, in particular during the periparturient period when resource allocation to immunity may limit host resistance. Second, we analysed the condition-infection relationship to detect a possible trade-off, in particular during the periparturient period. We experimentally infected young females in four stages over their first 2 years of life, including twice around parturition (at 1 year and at 2 years of age). Linear mixed-model analyses revealed a large and consistent between-line difference in infection traits during growth and outside of the periparturient period, whereas this difference was strongly attenuated during the periparturient period. Despite their different responses to infection, lines had similar body condition traits. Using covariance decomposition, we then found that the phenotypic relationship between infection and condition was dominated by direct infection costs arising from parasite development within the host. Accounting for these within-individual effects, a cost of resistance on body weight was detected among ewes during their first reproduction. Although this cost and the reproductive constraint on resistance are unlikely to represent a major concern for animal breeding in nutrient-rich environments, this study provides important new insights regarding the nutritional costs of parasite resistance at different lifestages and how these may affect response to selection.
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Affiliation(s)
- Frédéric Douhard
- GenPhySEUniversité de Toulouse, INRAE, ENVTCastanet‐TolosanFrance
| | - Andrea B. Doeschl‐Wilson
- The Roslin Institute and Royal (Dick) School of Veterinary StudiesUniversity of EdinburghEdinburghUK
| | - Alexander Corbishley
- The Roslin Institute and Royal (Dick) School of Veterinary StudiesUniversity of EdinburghEdinburghUK
| | | | | | | | - Sophie Aguerre
- GenPhySEUniversité de Toulouse, INRAE, ENVTCastanet‐TolosanFrance
| | - Léa Bordes
- UMR INRAE/ENVT 1225 IHAP, UMT Santé des Petits RuminantsEcole Nationale Vétérinaire de ToulouseToulouse cedex 03France
| | - Philippe Jacquiet
- UMR INRAE/ENVT 1225 IHAP, UMT Santé des Petits RuminantsEcole Nationale Vétérinaire de ToulouseToulouse cedex 03France
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23
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Erazo D, Pedersen AB, Fenton A. The predicted impact of resource provisioning on the epidemiological responses of different parasites. J Anim Ecol 2022; 91:1719-1730. [PMID: 35643978 PMCID: PMC9546467 DOI: 10.1111/1365-2656.13751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 05/07/2022] [Indexed: 11/27/2022]
Abstract
Anthropogenic activities and natural events such as periodic tree masting can alter resource provisioning in the environment, directly affecting animals, and potentially impacting the spread of infectious diseases in wildlife. The impact of these additional resources on infectious diseases can manifest through different pathways, affecting host susceptibility, contact rate and host demography. To date however, empirical research has tended to examine these different pathways in isolation, for example by quantifying the effects of provisioning on host behaviour in the wild or changes in immune responses in controlled laboratory studies. Furthermore, while theory has investigated the interactions between these pathways, this work has focussed on a narrow subset of pathogen types, typically directly transmitted microparasites. Given the diverse ways that provisioning can affect host susceptibility, contact patterns or host demography, we may expect the epidemiological consequences of provisioning to vary among different parasite types, dependent on key aspects of parasite life history, such as the duration of infection and transmission mode. Focusing on an exemplar empirical system, the wood mouse Apodemus sylvaticus, and its diverse parasite community, we developed a suite of epidemiological models to compare how resource provisioning alters responses for a range of these parasites that vary in their biology (microparasite and macroparasite), transmission mode (direct, environmental and vector transmitted) and duration of infection (acute, latent and chronic) within the same host population. We show there are common epidemiological responses to host resource provisioning across all parasite types examined. In particular, the epidemiological impact of provisioning could be driven in opposite directions, depending on which host pathways (contact rate, susceptibility or host demography) are most altered by the addition of resources to the environment. Broadly, these responses were qualitatively consistent across all parasite types, emphasising the importance of identifying general trade-offs between provisioning-altered parameters. Despite the qualitative consistency in responses to provisioning across parasite types, we predicted notable quantitative differences between parasites, with directly transmitted parasites (those conforming to SIR and SIS frameworks) predicted to show the strongest responses to provisioning among those examined, whereas the vector-borne parasites showed negligible responses to provisioning. As such, these analyses suggest that different parasites may show different scales of response to the same provisioning scenario, even within the same host population. This highlights the importance of knowing key aspects of host-parasite biology, to understand and predict epidemiological responses to provisioning for any specific host-parasite system.
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Affiliation(s)
- Diana Erazo
- Spatial Epidemiology Lab (SpELL)Université Libre de BruxellesBruxellesBelgium
- Institute of Infection, Veterinary & Ecological SciencesUniversity of LiverpoolLiverpoolUK
| | - Amy B. Pedersen
- Institute of Evolutionary BiologySchool of Biological SciencesUniversity of EdinburghEdinburghUK
| | - Andy Fenton
- Institute of Infection, Veterinary & Ecological SciencesUniversity of LiverpoolLiverpoolUK
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24
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Dinh H, Lundbäck I, Kumar S, Than AT, Morimoto J, Ponton F. Sugar-rich larval diet promotes lower adult pathogen load and higher survival after infection in a polyphagous fly. J Exp Biol 2022; 225:276376. [PMID: 35904096 DOI: 10.1242/jeb.243910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 07/19/2022] [Indexed: 11/20/2022]
Abstract
Nutrition is a central factor influencing immunity and resistance to infection, but the extent to which nutrition during development affects adult responses to infections is poorly understood. Our study investigated how the nutritional composition of the larval diet affects the survival, pathogen load, and food intake of adult fruit flies, Bactrocera tryoni, after septic bacterial infection. We found a sex-specific effect of larval diet composition on survival post-infection: survival rate was higher and bacterial load was lower for infected females fed sugar-rich larval diet compared with females fed protein-rich larval diet, an effect that was absent in males. Both males and females were heavier when fed a balanced larval diet compared to protein- or sugar-rich diet, while body lipid reserves were higher in the sugar-rich larval diet compared with other diets. Body protein reserve was lower for sugar-rich larval diets compared to other diets in males, but not females. Both females and males shifted their nutrient intake to ingest a sugar-rich diet when infected compared with sham-infected flies without any effect of the larval diet, suggesting that sugar-rich diets can be beneficial to fight off bacterial infection as shown in previous literature. Overall, our findings show that nutrition during early life can shape individual fitness in adulthood.
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Affiliation(s)
- Hue Dinh
- School of Natural Sciences, Macquarie University, Australia
| | - Ida Lundbäck
- School of Natural Sciences, Macquarie University, Australia
| | - Sheemal Kumar
- School of Natural Sciences, Macquarie University, Australia
| | - Anh The Than
- School of Natural Sciences, Macquarie University, Australia.,Department of Entomology, Vietnam National University of Agriculture, Vietnam
| | - Juliano Morimoto
- School of Natural Sciences, Macquarie University, Australia.,School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Ave, Aberdeen AB24 2TZ, UK.,Programa de Pós-graduação em Ecologia e Conservação, Universidade Federal do Paraná, Curitiba, 82590-300, Brazil
| | - Fleur Ponton
- School of Natural Sciences, Macquarie University, Australia
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25
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Hu YW, Wang SH, Tang Y, Xie GQ, Ding YJ, Xu QY, Tang B, Zhang L, Wang SG. Suppression of yolk formation, oviposition and egg quality of locust (Locusta migratoria manilensis) infected by Paranosema locustae. Front Immunol 2022; 13:848267. [PMID: 35935997 PMCID: PMC9352533 DOI: 10.3389/fimmu.2022.848267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 06/27/2022] [Indexed: 11/13/2022] Open
Abstract
Locusta migratoria manilensis is one of the most important agricultural pests in China. The locust has high fecundity and consumes large quantities of food, causing severe damage to diverse crops such as corn, sorghum, and rice. Immunity against pathogens and reproductive success are two important components of individual fitness, and many insects have a trade-off between reproduction and immunity when resources are limited, which may be an important target for pest control. In this study, adult females L. migratoria manilensis were treated with different concentrations (5 × 106 spores/mL or 2 × 107 spores/mL) of the entomopathogenic fungus Paranosema locustae. Effects of input to immunity on reproduction were studied by measuring feeding amount, enzyme activity, vitellogenin (Vg) and vitellogenin receptor (VgR) production, ovary development, and oviposition amount. When infected by P. locustae, feeding rate and phenol oxidase and lysozyme activities increased, mRNA expression of Vg and VgR genes decreased, and yolk deposition was blocked. Weight of ovaries decreased, with significant decreases in egg, length and weight.Thus, locusts used nutritive input required for reproduction to resist invasion by microsporidia. This leads to a decrease in expression of Vg and VgR genes inhibited ovarian development, and greatly decreased total fecundity. P. locustae at 2 × 107 spores/mL had a more obvious inhibitory effect on the ovarian development in migratory locusts. This study provides a detailed trade-off between reproduction and immune input of the female, which provides a reliable basis to find pest targets for biological control from those trade-off processes.
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Affiliation(s)
- Yao-Wen Hu
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Shao-Hua Wang
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Ya Tang
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Guo-Qiang Xie
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Yan-Juan Ding
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Qing-Ye Xu
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Bin Tang
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Long Zhang
- Department of Entomology, China Agricultural University, Beijing, China
| | - Shi-Gui Wang
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
- *Correspondence: Shi-Gui Wang,
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26
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Sieben AJ, Mihaljevic JR, Shoemaker LG. Quantifying mechanisms of coexistence in disease ecology. Ecology 2022; 103:e3819. [PMID: 35855596 DOI: 10.1002/ecy.3819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/22/2022] [Accepted: 04/20/2022] [Indexed: 11/06/2022]
Abstract
Pathogen coexistence depends on ecological processes operating at both within and between-host scales, making it difficult to quantify which processes may promote or prevent coexistence. Here, we propose that adapting modern coexistence theory-traditionally applied in plant communities-to pathogen systems provides an exciting approach for examining mechanisms of coexistence operating across different spatial scales. We first overview modern coexistence theory and its mechanistic decomposition; we subsequently adapt the framework to quantify how spatial variation in pathogen density, host resources and immunity, and their interaction may promote pathogen coexistence. We apply this derivation to an example two pathogen, multi-scale model comparing two scenarios with generalist and strain-specific immunity: one with demographic equivalency among pathogens and one with demographic trade-offs among pathogens. We then show how host-pathogen feedbacks generate spatial heterogeneity that promote pathogen coexistence and decompose those mechanisms to quantify how each spatial heterogeneity contributes to that coexistence. Specifically, coexistence of demographically equivalent pathogens occurs due to spatial variation in host resources, immune responses, and pathogen aggregation. With a competition-colonization trade-off, the superior colonizer requires spatial heterogeneity to coexist, whereas the superior competitor does not. Finally, we suggest ways forward for linking theory and empirical tests of coexistence in disease systems.
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Affiliation(s)
- Andrew J Sieben
- Department of Botany, University of Wyoming, Laramie, WY.,School of Medicine, Emory University, Atlanta, GA
| | - Joseph R Mihaljevic
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ
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27
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Zilio G, Kaltz O, Koella JC. Resource availability for the mosquito Aedes aegypti affects the transmission mode evolution of a microsporidian parasite. Evol Ecol 2022. [DOI: 10.1007/s10682-022-10184-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractEcological conditions may greatly affect the relative importance of vertical and horizontal transmission, in particular for parasites with a mixed mode of transmission. Resource availability is one important environmental factor, affecting host growth and fecundity, but also the parasite’s own development. The consequences for the potential of vertical and horizontal transmission and for the evolution of transmission mode are largely unknown. We let the mixed-mode microsporidian parasite Edhazardia aedis evolve on its mosquito host Aedes aegypti under high-food or low-food conditions, representing permissive and restricted conditions. These alter the timing of development of infected larvae and thereby the probabilities for the parasites to enter the vertical or horizontal transmission pathways. After 10 generations, evolved parasites were assayed under the two food levels. There was an ecological trade-off between transmission modes, mediated by nutrient effects on host development, resulting in a higher vertical transmission (VT) potential under high-food and a higher horizontal transmission (HT) potential under low-food test conditions. Evolution under high food increased the VT potential of the parasite, particularly if it was tested at low food. This involved higher probability of carrying binucleate spores for the emerging females, greater fecundity and a longer life compared to parasites that were tested in the same conditions but had evolved under low food. The changes are related to the developmental regulation and switch in the production of two spore types, affecting investment in VT or HT. In contrast, the HT potential remained relatively unaffected by the parasite’s evolutionary history, suggesting that, within our experiential design, the VT mode evolved independently of the HT mode. Our work illustrates the possible links between resource availability, within-host developmental processes and the evolution of parasite transmission investment. Future work, theoretical and experimental, should scale up from within-host to between-host levels, including eco-evolutionary and epidemiological dynamics.
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28
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Hamilton PT, Anholt BR, Nelson BH. Tumour immunotherapy: lessons from predator-prey theory. Nat Rev Immunol 2022; 22:765-775. [PMID: 35513493 DOI: 10.1038/s41577-022-00719-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/04/2022] [Indexed: 12/15/2022]
Abstract
With the burgeoning use of immune-based treatments for cancer, never has there been a greater need to understand the tumour microenvironment within which immune cells function and how it can be perturbed to inhibit tumour growth. Yet, current challenges in identifying optimal combinations of immunotherapies and engineering new cell-based therapies highlight the limitations of conventional paradigms for the study of the tumour microenvironment. Ecology has a rich history of studying predator-prey dynamics to discern factors that drive prey to extinction. Here, we describe the basic tenets of predator-prey theory as applied to 'predation' by immune cells and the 'extinction' of cancer cells. Our synthesis reveals fundamental mechanisms by which antitumour immunity might fail in sometimes counterintuitive ways and provides a fresh yet evidence-based framework to better understand and therapeutically target the immune-cancer interface.
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Affiliation(s)
| | - Bradley R Anholt
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
| | - Brad H Nelson
- Deeley Research Centre, BC Cancer, Victoria, British Columbia, Canada. .,Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, Canada. .,Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada.
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29
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Affiliation(s)
- Amy R. Sweeny
- Institute of Evolutionary Biology University of Edinburgh Edinburgh Scotland
| | - Gregory F. Albery
- Department of Biology Georgetown University Washington DC USA
- Wissenschaftskolleg zu Berlin Berlin Germany
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30
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Cotter SC, Al Shareefi E. Nutritional ecology, infection and immune defence - exploring the mechanisms. CURRENT OPINION IN INSECT SCIENCE 2022; 50:100862. [PMID: 34952240 DOI: 10.1016/j.cois.2021.12.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 12/01/2021] [Accepted: 12/10/2021] [Indexed: 06/14/2023]
Abstract
Diet can impact the outcome of parasitic infection in three, non-mutually exclusive ways: 1) by changing the physiological environment of the host, such as the availability of key nutritional resources, the presence of toxic dietary chemicals, the pH or osmolality of the blood or gut, 2) by enhancing the immune response and 3) by altering the presence of host microbiota, which help to digest nutrients and are a potential source of antibiotics. We show that there are no clear patterns in the effects of diet across taxa and that good evidence for the mechanisms by which diet exerts its effects are often lacking. More studies are required to understand the mechanisms of action if we are to discern patterns that can be generalised across host and parasite taxa.
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Affiliation(s)
- Sheena C Cotter
- School of Life Sciences, University of Lincoln, Brayford Pool, Lincoln LN6 7TS, UK.
| | - Ekhlas Al Shareefi
- Dept of Biology, College of Science for Women, University of Babylon, Hillah-Babil, Iraq
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31
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Paraskevopoulou S, Gattis S, Ben-Ami F. Parasite resistance and parasite tolerance: insights into transgenerational immune priming in an invertebrate host. Biol Lett 2022; 18:20220018. [PMID: 35382587 PMCID: PMC8984330 DOI: 10.1098/rsbl.2022.0018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 03/08/2022] [Indexed: 01/04/2023] Open
Abstract
Parasites impose different selection regimes on their hosts, which respond by increasing their resistance and/or tolerance. Parental challenge with parasites can enhance the immune response of their offspring, a phenomenon documented in invertebrates and termed transgenerational immune priming. We exposed two parental generations of the model organism Daphnia magna to the horizontally transmitted parasitic yeast Metschnikowia bicuspidata and recorded resistance- and tolerance-related traits in the offspring generation. We hypothesized that parentally primed offspring will increase either their resistance or their tolerance to the parasite. Our susceptibility assays revealed no impact of parental exposure on offspring resistance. Nonetheless, different fitness-related traits, which are indicative of tolerance, were altered. Specifically, maternal priming increased offspring production and decreased survival. Grandmaternal priming positively affected age at first reproduction and negatively affected brood size at first reproduction. Interestingly, both maternal and grandmaternal priming significantly reduced within-host-parasite proliferation. Nevertheless, Daphnia primed for two consecutive generations had no competitive advantage in comparison to unprimed ones, implying additive maternal and grandmaternal effects. Our findings do not support evidence of transgenerational immune priming from bacterial infections in the same host species, thus, emphasizing that transgenerational immune responses may not be consistent even within the same host species.
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Affiliation(s)
- Sofia Paraskevopoulou
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 6997801, Israel
| | - Sabrina Gattis
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 6997801, Israel
| | - Frida Ben-Ami
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 6997801, Israel
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32
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Deschodt PS, Cory JS. Resource limitation has a limited impact on the outcome of virus-fungus co-infection in an insect host. Ecol Evol 2022; 12:e8707. [PMID: 35342581 PMCID: PMC8928876 DOI: 10.1002/ece3.8707] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 02/11/2022] [Accepted: 02/14/2022] [Indexed: 11/10/2022] Open
Abstract
Infection by pathogens is strongly affected by the diet or condition of the prospective host. Studies that examine the impact of diet have mainly focused on single pathogens; however, co-infections within a single host are thought to be common. Different pathogen groups might respond differently to resource availability and diverse infections could increase the costs of host defense, meaning the outcome of mixed infections under varying dietary regimes is likely to be hard to predict. We used the generalist cabbage looper, Trichoplusia ni and two of its pathogens, the DNA virus T. ni nucleopolyhedrovirus (TniSNPV) and the entomopathogenic fungus, Beauveria bassiana to examine how nutrient reduction affected the outcome of mixed pathogen infection. We challenged insects with a low or high effective dose of virus, alone or combined with a single dose of fungus. We manipulated food availability after pathogen challenge by diluting artificial diet with cellulose, a non-nutritious bulking agent, and examined its impact on host and pathogen fitness. Reducing diet quantity did not alter overall or pathogen-specific mortality. In all cases, TniSNPV-induced mortality was negatively affected by fungus challenge. Similarly, B. bassiana-induced mortality was negatively affected by TniSNPV challenge, but only at the higher virus dose. Dietary dilution mainly affected B. bassiana speed of kill when mixed with a high dose of TniSNPV, with an increase in the duration of fungal infection when cellulose was low (high quantity). One pathogen dominated the production of transmission stages in the cadavers and co-infection did not affect the yield of either pathogen. There was no evidence that co-infections were more costly to the survivors of pathogen challenge. In conclusion, dietary dilution did not determine the outcome of mixed pathogen infection, but it had more subtle effects, that differed between the two pathogens and could potentially alter pathogen recycling and host-pathogen dynamics.
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Affiliation(s)
- Pauline S. Deschodt
- Department of Biological SciencesSimon Fraser UniversityBurnabyBritish ColumbiaCanada
| | - Jenny S. Cory
- Department of Biological SciencesSimon Fraser UniversityBurnabyBritish ColumbiaCanada
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33
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Lin YP, Tufts DM, Combs M, Dupuis AP, Marcinkiewicz AL, Hirsbrunner AD, Diaz AJ, Stout JL, Blom AM, Strle K, Davis AD, Kramer LD, Kolokotronis SO, Diuk-Wasser MA. Cellular and immunological mechanisms influence host-adapted phenotypes in a vector-borne microparasite. Proc Biol Sci 2022; 289:20212087. [PMID: 35193398 PMCID: PMC8864362 DOI: 10.1098/rspb.2021.2087] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 01/18/2022] [Indexed: 01/15/2023] Open
Abstract
Predicting pathogen emergence and spillover risk requires understanding the determinants of a pathogens' host range and the traits involved in host competence. While host competence is often considered a fixed species-specific trait, it may be variable if pathogens diversify across hosts. Balancing selection can lead to maintenance of pathogen polymorphisms (multiple-niche-polymorphism; MNP). The causative agent of Lyme disease, Borrelia burgdorferi (Bb), provides a model to study the evolution of host adaptation, as some Bb strains defined by their outer surface protein C (ospC) genotype, are widespread in white-footed mice and others are associated with non-rodent vertebrates (e.g. birds). To identify the mechanisms underlying potential strain × host adaptation, we infected American robins and white-footed mice, with three Bb strains of different ospC genotypes. Bb burdens varied by strain in a host-dependent fashion, and strain persistence in hosts largely corresponded to Bb survival at early infection stages and with transmission to larvae (i.e. fitness). Early survival phenotypes are associated with cell adhesion, complement evasion and/or inflammatory and antibody-mediated removal of Bb, suggesting directional selective pressure for host adaptation and the potential role of MNP in maintaining OspC diversity. Our findings will guide future investigations to inform eco-evolutionary models of host adaptation for microparasites.
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Affiliation(s)
- Yi-Pin Lin
- Division of Infectious Diseases, Wadsworth Center, NYSDOH, Albany, NY, USA
- Department of Biomedical Sciences, SUNY Albany, Albany, NY, USA
| | - Danielle M. Tufts
- Department of Ecology, Evolution, and Environmental Biology, Columbia University, New York, NY, USA
- Infectious Diseases and Microbiology Department, University of Pittsburgh, Pittsburgh, PA, USA
| | - Matthew Combs
- Department of Ecology, Evolution, and Environmental Biology, Columbia University, New York, NY, USA
| | - Alan P. Dupuis
- Division of Infectious Diseases, Wadsworth Center, NYSDOH, Albany, NY, USA
| | | | | | - Alexander J. Diaz
- Division of Infectious Diseases, Wadsworth Center, NYSDOH, Albany, NY, USA
| | - Jessica L. Stout
- Division of Infectious Diseases, Wadsworth Center, NYSDOH, Albany, NY, USA
| | - Anna M. Blom
- Division of Medical Protein Chemistry, Department of Translational Medicine, Lund University, Malmo, Sweden
| | - Klemen Strle
- Division of Infectious Diseases, Wadsworth Center, NYSDOH, Albany, NY, USA
- Department of Biomedical Sciences, SUNY Albany, Albany, NY, USA
| | - April D. Davis
- Division of Infectious Diseases, Wadsworth Center, NYSDOH, Albany, NY, USA
| | - Laura D. Kramer
- Division of Infectious Diseases, Wadsworth Center, NYSDOH, Albany, NY, USA
- Department of Biomedical Sciences, SUNY Albany, Albany, NY, USA
| | - Sergios-Orestis Kolokotronis
- Department of Epidemiology and Biostatistics, School of Public Health, College of Medicine, SUNY Downstate Health Sciences University, Brooklyn, NY, USA
- Institute for Genomic Health, College of Medicine, SUNY Downstate Health Sciences University, Brooklyn, NY, USA
- Division of Infectious Diseases, Department of Medicine, College of Medicine, SUNY Downstate Health Sciences University, Brooklyn, NY, USA
| | - Maria A. Diuk-Wasser
- Department of Ecology, Evolution, and Environmental Biology, Columbia University, New York, NY, USA
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34
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Loo SL, Tanaka MM. The role of a programmatic immune response on the evolution of pathogen traits. J Theor Biol 2022; 534:110962. [PMID: 34822803 DOI: 10.1016/j.jtbi.2021.110962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 11/07/2021] [Accepted: 11/11/2021] [Indexed: 11/26/2022]
Abstract
In modelling pathogen evolution during epidemics, it is important to understand the interactions between within-host infection dynamics and between-host pathogen transmission. Multiscale models often assume an immune response that is highly responsive to pathogen dynamics. Empirical evidence, however, suggests that the immune response in acute infections is triggered and programmatic. This leads to somewhat more predictable infection trajectories where transition times and, consequently, the infectious window are non-exponentially distributed. Here, we develop a within-host model where the immune response is triggered by pathogen growth but otherwise develops independently, and use this to obtain analytic expressions for the infectious period and peak pathogen load. This allows us to model the basic reproductive number in terms of explicit functional relationships among within-host traits including the growth rate of the pathogen. We find that the dependence of pathogen load and the infectious window on within-host parameters constrains the evolution of the pathogen growth rate. At low growth rate, selection favours a higher pathogen load and therefore increasing pathogen growth rate. At high growth rates, selection for a longer infectious window trades off against selection against the effects of virulence. At intermediate growth rates the basic reproductive number is relatively insensitive to changes in the growth rate. The resulting "flat" region of the pathogen fitness landscape is due to the stability of the programmatic immune response in clearing the infection.
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Affiliation(s)
- Sara L Loo
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Evolution & Ecology Research Centre, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Mark M Tanaka
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Evolution & Ecology Research Centre, University of New South Wales, Sydney, NSW 2052, Australia
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35
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Tate AT, Schulz NK. The within-host ecology of insects and their parasites: integrating experiments and mathematical models. CURRENT OPINION IN INSECT SCIENCE 2022; 49:37-41. [PMID: 34793990 DOI: 10.1016/j.cois.2021.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 11/03/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
The within-host ecology of hosts and their microbes involves complex feedbacks between the host immune system, energetic resources, and microbial growth and virulence, which in turn affect the probability of transmission to new hosts. This complexity can be challenging to address with experiments alone, and mathematical models have traditionally played an essential role in disentangling these processes, making new predictions, and bridging gaps across biological scales. Insect hosts serve as uniquely powerful systems for the integration of experiments and theory in disease biology. In this review, we highlight recent studies in fruit flies, moths, beetles and other invertebrates that have inspired important mathematical models, and present open questions arising from recent modeling efforts that are ripe for testing in insects.
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Affiliation(s)
- Ann T Tate
- Department of Biological Sciences, Vanderbilt University, 465 21(st) Ave S., Nashville, TN, USA.
| | - Nora Ke Schulz
- Department of Biological Sciences, Vanderbilt University, 465 21(st) Ave S., Nashville, TN, USA
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36
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Elderd BD, Mideo N, Duffy MA. Looking across Scales in Disease Ecology and Evolution. Am Nat 2022; 199:51-58. [DOI: 10.1086/717176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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37
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Rovenolt FH, Tate AT. The Impact of Coinfection Dynamics on Host Competition and Coexistence. Am Nat 2022; 199:91-107. [DOI: 10.1086/717180] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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38
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Brandell EE, Becker DJ, Sampson L, Forbes KM. Demography, education, and research trends in the interdisciplinary field of disease ecology. Ecol Evol 2021; 11:17581-17592. [PMID: 35003624 PMCID: PMC8717357 DOI: 10.1002/ece3.8466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 11/30/2021] [Accepted: 12/02/2021] [Indexed: 11/06/2022] Open
Abstract
Micro- and macroparasites are a leading cause of mortality for humans, animals, and plants, and there is great need to understand their origins, transmission dynamics, and impacts. Disease ecology formed as an interdisciplinary field in the 1970s to fill this need and has recently rapidly grown in size and influence. Because interdisciplinary fields integrate diverse scientific expertise and training experiences, understanding their composition and research priorities is often difficult. Here, for the first time, we quantify the composition and educational experiences of a subset of disease ecology practitioners and identify topical trends in published research. We combined a large survey of self-declared disease ecologists with a literature synthesis involving machine-learning topic detection of over 18,500 disease ecology research articles. The number of graduate degrees earned by disease ecology practitioners has grown dramatically since the early 2000s. Similar to other science fields, we show that practitioners in disease ecology have diversified in the last decade in terms of gender identity and institution, with weaker diversification in race and ethnicity. Topic detection analysis revealed how the frequency of publications on certain topics has declined (e.g., HIV, serology), increased (e.g., the dilution effect, infectious disease in bats), remained relatively common (e.g., malaria ecology, influenza, vaccine research and development), or have consistently remained relatively infrequent (e.g., theoretical models, field experiments). Other topics, such as climate change, superspreading, emerging infectious diseases, and network analyses, have recently come to prominence. This study helps identify the major themes of disease ecology and demonstrates how publication frequency corresponds to emergent health and environmental threats. More broadly, our approach provides a framework to examine the composition and publication trends of other major research fields that cross traditional disciplinary boundaries.
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Affiliation(s)
- Ellen E. Brandell
- Department of BiologyCenter for Infectious Disease DynamicsHuck Institute of the Life SciencesPennsylvania State UniversityUniversity ParkPennsylvaniaUSA
| | | | - Laura Sampson
- Department of BiologyCenter for Infectious Disease DynamicsHuck Institute of the Life SciencesPennsylvania State UniversityUniversity ParkPennsylvaniaUSA
| | - Kristian M. Forbes
- Department of Biological SciencesUniversity of ArkansasFayettevilleArkansasUSA
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Rogalski MA, Stewart Merrill T, Gowler CD, Cáceres CE, Duffy MA. Context-Dependent Host-Symbiont Interactions: Shifts along the Parasitism-Mutualism Continuum. Am Nat 2021; 198:563-575. [PMID: 34648395 DOI: 10.1086/716635] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractSymbiotic interactions can shift along a mutualism-parasitism continuum. While there are many studies examining dynamics typically considered to be mutualistic that sometimes shift toward parasitism, little is known about conditions underlying shifts from parasitism toward mutualism. In lake populations, we observed that infection by a microsporidian gut symbiont sometimes conferred a reproductive advantage and other times a disadvantage to its Daphnia host. We hypothesized that the microsporidian might benefit its host by reducing infection by more virulent parasites, which attack via the gut. In a laboratory study using field-collected animals, we found that spores of a virulent fungal parasite were much less capable of penetrating the guts of Daphnia harboring the microsporidian gut symbiont. We predicted that this altered gut penetrability could cause differential impacts on host fitness depending on ecological context. Field survey data revealed that microsporidian-infected Daphnia hosts experienced a reproductive advantage when virulent parasites were common while resource scarcity led to a reproductive disadvantage, but only in lakes where virulent parasites were relatively rare. Our findings highlight the importance of considering multiparasite community context and resource availability in host-parasite studies and open the door for future research into conditions driving shifts along parasitism to mutualism gradients.
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Strauss AT, Bowerman L, Porath‐Krause A, Seabloom EW, Borer ET. Mixed infection, risk projection, and misdirection: Interactions among pathogens alter links between host resources and disease. Ecol Evol 2021; 11:9599-9609. [PMID: 34306646 PMCID: PMC8293790 DOI: 10.1002/ece3.7781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 05/18/2021] [Indexed: 11/27/2022] Open
Abstract
A growing body of literature links resources of hosts to their risk of infectious disease. Yet most hosts encounter multiple pathogens, and projections of disease risk based on resource availability could be fundamentally wrong if they do not account for interactions among pathogens within hosts. Here, we measured infection risk of grass hosts (Avena sativa) exposed to three naturally co-occurring viruses either singly or jointly (barley and cereal yellow dwarf viruses [B/CYDVs]: CYDV-RPV, BYDV-PAV, and BYDV-SGV) along experimental gradients of nitrogen and phosphorus supply. We asked whether disease risk (i.e., infection prevalence) differed in single versus co-inoculations, and whether these differences varied with rates and ratios of nitrogen and phosphorus supply. In single inoculations, the viruses did not respond strongly to nitrogen or phosphorus. However, in co-inoculations, we detected illustrative cases of 1) resource-dependent antagonism (lower prevalence of RPV with increasing N; possibly due to competition), 2) resource-dependent facilitation (higher prevalence of SGV with decreasing N:P; possibly due to immunosuppression), and 3) weak or no interactions within hosts (for PAV). Together, these within-host interactions created emergent patterns for co-inoculated hosts, with both infection prevalence and viral richness increasing with the combination of low nitrogen and high phosphorus supply. We demonstrate that knowledge of multiple pathogens is essential for predicting disease risk from host resources and that projections of risk that fail to acknowledge resource-dependent interactions within hosts could be qualitatively wrong. Expansions of theory from community ecology theory may help anticipate such relationships by linking host resources to diverse pathogen communities.
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Affiliation(s)
- Alexander T. Strauss
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSt. PaulMNUSA
- Odum School of EcologyUniversity of GeorgiaAthensGAUSA
| | - Lucas Bowerman
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSt. PaulMNUSA
| | - Anita Porath‐Krause
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSt. PaulMNUSA
| | - Eric W. Seabloom
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSt. PaulMNUSA
| | - Elizabeth T. Borer
- Department of Ecology, Evolution, and BehaviorUniversity of MinnesotaSt. PaulMNUSA
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Civitello DJ, Hartman RB. Size-asymmetric competition among snails disrupts production of human-infectious Schistosoma mansoni cercariae. Ecology 2021; 102:e03383. [PMID: 33950517 PMCID: PMC8249335 DOI: 10.1002/ecy.3383] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/15/2021] [Indexed: 01/17/2023]
Abstract
Parasites can harm hosts and influence populations, communities, and ecosystems. However, parasites are reciprocally affected by population- and community-level dynamics. Understanding feedbacks between infection dynamics and larger-scale epidemiological and ecological processes could improve predictions and reveal novel control methods. We evaluated how exploitative resource competition among hosts, a fundamental aspect of population biology, influences within-host infection dynamics of the widespread human parasite Schistosoma mansoni in its intermediate host, Biomphalaria glabrata. We added size-dependent consumption of shared resources to a parameterized bioenergetics model to predict a priori the growth, parasite production, and survival of an infected focal host coexisting with an uninfected conspecific competitor in an experiment that varied competitor size. The model quantitatively anticipated that competitors disrupt growth and parasite production and that these effects increase with competitor size. Fitting the model to these data improved its match to host survivorship. Thus, resource competition alters infection dynamics, there are strong size asymmetries in these effects, and size-asymmetric resource competition effects on infection dynamics can be accurately predicted by bioenergetics theory. More broadly, this framework can assess parasite transmission and control in other contexts, such as in resource competitive host communities, or in response to eutrophication, food supplementation, or culling.
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Affiliation(s)
- David J. Civitello
- Department of Biology, Emory University, 1510 Clifton Rd NE, Atlanta, GA 30322
| | - Rachel B. Hartman
- Department of Biology, Emory University, 1510 Clifton Rd NE, Atlanta, GA 30322
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Bourgoin G, Portanier E, Poirel MT, Itty C, Duhayer J, Benabed S, Cockenpot A, Callait-Cardinal MP, Garel M. Reproductive females and young mouflon ( Ovis gmelini musimon × Ovis sp.) in poor body condition are the main spreaders of gastrointestinal parasites. Parasitology 2021; 148:809-818. [PMID: 33593470 PMCID: PMC11010168 DOI: 10.1017/s0031182021000329] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 02/11/2021] [Accepted: 02/13/2021] [Indexed: 11/07/2022]
Abstract
Several individual, environmental and parasitic factors can influence the impacts of parasites on host's fitness and on host's ability to transmit these parasites to new hosts. Identifying these factors and the individuals who play a greater role in parasite transmission is of main concern for the development of parasite control strategies. In the present study, we aimed to describe the diversity of gastrointestinal parasites and to identify the individual factors influencing the faecal spreading of parasites in a free-ranging population of Mediterranean mouflon. From the analysis of 433 faecal samples, we found Eimeria spp. and gastrointestinal strongyles (GIS) were the most common parasites (>94%). The faecal oocyst counts of Eimeria spp. were the highest during the first years of life. It was 1.6 times higher in females than in males and 2.5 times higher in individuals in poor than in good body condition. Similarly, the faecal egg count of GIS was higher in females and decreased with age, but only in males. Finally, reproductive females had GIS faecal egg count values 2.6 times higher than non-reproductive females. Management strategies of parasites should thus primarily focus on reproductive females and young individuals in poor body condition as they represent the main contamination source of the environment.
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Affiliation(s)
- Gilles Bourgoin
- Laboratoire de parasitologie vétérinaire, Université de Lyon, VetAgro Sup – Campus Vétérinaire de Lyon, 1 avenue Bourgelat, BP 83, F-69280 Marcy l'Etoile, France
- Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, CNRS, UMR 5558, F-69622Villeurbanne, France
| | - Elodie Portanier
- Laboratoire de parasitologie vétérinaire, Université de Lyon, VetAgro Sup – Campus Vétérinaire de Lyon, 1 avenue Bourgelat, BP 83, F-69280 Marcy l'Etoile, France
- Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, CNRS, UMR 5558, F-69622Villeurbanne, France
| | - Marie-Thérèse Poirel
- Laboratoire de parasitologie vétérinaire, Université de Lyon, VetAgro Sup – Campus Vétérinaire de Lyon, 1 avenue Bourgelat, BP 83, F-69280 Marcy l'Etoile, France
- Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, CNRS, UMR 5558, F-69622Villeurbanne, France
| | - Christian Itty
- Office Français de la Biodiversité, Unité Ongulés Sauvages, 5 allée de Bethléem, Z.I. Mayencin, F-38610Gières, France
| | - Jeanne Duhayer
- Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, CNRS, UMR 5558, F-69622Villeurbanne, France
| | - Slimania Benabed
- Laboratoire de parasitologie vétérinaire, Université de Lyon, VetAgro Sup – Campus Vétérinaire de Lyon, 1 avenue Bourgelat, BP 83, F-69280 Marcy l'Etoile, France
- Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, CNRS, UMR 5558, F-69622Villeurbanne, France
| | - Anne Cockenpot
- Laboratoire de parasitologie vétérinaire, Université de Lyon, VetAgro Sup – Campus Vétérinaire de Lyon, 1 avenue Bourgelat, BP 83, F-69280 Marcy l'Etoile, France
| | - Marie-Pierre Callait-Cardinal
- Laboratoire de parasitologie vétérinaire, Université de Lyon, VetAgro Sup – Campus Vétérinaire de Lyon, 1 avenue Bourgelat, BP 83, F-69280 Marcy l'Etoile, France
- Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, Université Lyon 1, CNRS, UMR 5558, F-69622Villeurbanne, France
| | - Mathieu Garel
- Office Français de la Biodiversité, Unité Ongulés Sauvages, 5 allée de Bethléem, Z.I. Mayencin, F-38610Gières, France
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Ferreira SCM, Veiga MM, Hofer H, East ML, Czirják GÁ. Noninvasively measured immune responses reflect current parasite infections in a wild carnivore and are linked to longevity. Ecol Evol 2021; 11:7685-7699. [PMID: 34188844 PMCID: PMC8216923 DOI: 10.1002/ece3.7602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 04/02/2021] [Accepted: 04/06/2021] [Indexed: 01/03/2023] Open
Abstract
Host immune defenses are important components of host-parasite interactions that affect the outcome of infection and may have fitness consequences for hosts when increased allocation of resources to immune responses undermines other essential life processes. Research on host-parasite interactions in large free-ranging wild mammals is currently hampered by a lack of verified noninvasive assays. We successfully adapted existing assays to measure innate and adaptive immune responses produced by the gastrointestinal mucosa in spotted hyena (Crocuta crocuta) feces, including enzyme-linked immunosorbent assays (ELISAs), to quantify fecal immunoglobulins (total IgA, total IgG) and total fecal O-linked oligosaccharides (mucin). We investigated the effect of infection load by an energetically costly hookworm (Ancylostoma), parasite richness, host age, sex, year of sampling, and clan membership on immune responses and asked whether high investment in immune responses during early life affects longevity in individually known spotted hyenas in the Serengeti National Park, Tanzania. Fecal concentrations of IgA, IgG, and mucin increased with Ancylostoma egg load and were higher in juveniles than in adults. Females had higher mucin concentrations than males. Juvenile females had higher IgG concentrations than juvenile males, whereas adult females had lower IgG concentrations than adult males. High IgA concentrations during the first year of life were linked to reduced longevity after controlling for age at sampling and Ancylostoma egg load. Our study demonstrates that the use of noninvasive methods can increase knowledge on the complex relationship between gastrointestinal parasites and host local immune responses in wild large mammals and reveal fitness-relevant effects of these responses.
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Affiliation(s)
- Susana C. M. Ferreira
- Department of Ecological DynamicsLeibniz Institute for Zoo and Wildlife ResearchBerlinGermany
- Present address:
Division of Computational Systems BiologyCentre for Microbiology and Environmental Systems ScienceViennaAustria
| | - Miguel M. Veiga
- Department of Ecological DynamicsLeibniz Institute for Zoo and Wildlife ResearchBerlinGermany
| | - Heribert Hofer
- Department of Ecological DynamicsLeibniz Institute for Zoo and Wildlife ResearchBerlinGermany
- Department of Veterinary MedicineFreie Universität BerlinBerlinGermany
- Department of Biology, Chemistry and PharmacyFreie Universität BerlinBerlinGermany
| | - Marion L. East
- Department of Ecological DynamicsLeibniz Institute for Zoo and Wildlife ResearchBerlinGermany
| | - Gábor Á. Czirják
- Department of Wildlife DiseasesLeibniz Institute for Zoo and Wildlife ResearchBerlinGermany
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Tao Y, Hite JL, Lafferty KD, Earn DJD, Bharti N. Transient disease dynamics across ecological scales. THEOR ECOL-NETH 2021; 14:625-640. [PMID: 34075317 PMCID: PMC8156581 DOI: 10.1007/s12080-021-00514-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 05/04/2021] [Indexed: 11/25/2022]
Abstract
Analyses of transient dynamics are critical to understanding infectious disease transmission and persistence. Identifying and predicting transients across scales, from within-host to community-level patterns, plays an important role in combating ongoing epidemics and mitigating the risk of future outbreaks. Moreover, greater emphases on non-asymptotic processes will enable timely evaluations of wildlife and human diseases and lead to improved surveillance efforts, preventive responses, and intervention strategies. Here, we explore the contributions of transient analyses in recent models spanning the fields of epidemiology, movement ecology, and parasitology. In addition to their roles in predicting epidemic patterns and endemic outbreaks, we explore transients in the contexts of pathogen transmission, resistance, and avoidance at various scales of the ecological hierarchy. Examples illustrate how (i) transient movement dynamics at the individual host level can modify opportunities for transmission events over time; (ii) within-host energetic processes often lead to transient dynamics in immunity, pathogen load, and transmission potential; (iii) transient connectivity between discrete populations in response to environmental factors and outbreak dynamics can affect disease spread across spatial networks; and (iv) increasing species richness in a community can provide transient protection to individuals against infection. Ultimately, we suggest that transient analyses offer deeper insights and raise new, interdisciplinary questions for disease research, consequently broadening the applications of dynamical models for outbreak preparedness and management. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s12080-021-00514-w.
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Affiliation(s)
- Yun Tao
- Intelligence Community Postdoctoral Research Fellowship Program, Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106 USA
| | - Jessica L. Hite
- School of Veterinary Medicine, Department of Pathobiological Sciences, University of Wisconsin, Madison, WI 53706 USA
| | - Kevin D. Lafferty
- Western Ecological Research Center at UCSB Marine Science Institute, U.S. Geological Survey, CA 93106 Santa Barbara, USA
| | - David J. D. Earn
- Department of Mathematics and Statistics, McMaster University, Hamilton, ON L8S 4K1 Canada
| | - Nita Bharti
- Department of Biology Center for Infectious Disease Dynamics, Penn State University, University Park, PA 16802 USA
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45
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Using ecological coexistence theory to understand antibiotic resistance and microbial competition. Nat Ecol Evol 2021; 5:431-441. [PMID: 33526890 DOI: 10.1038/s41559-020-01385-w] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 12/11/2020] [Indexed: 01/30/2023]
Abstract
Tackling antibiotic resistance necessitates deep understanding of how resource competition within and between species modulates the fitness of resistant microbes. Recent advances in ecological coexistence theory offer a powerful framework to probe the mechanisms regulating intra- and interspecific competition, but the significance of this body of theory to the problem of antibiotic resistance has been largely overlooked. In this Perspective, we draw on emerging ecological theory to illustrate how changes in resource niche overlap can be equally important as changes in competitive ability for understanding costs of resistance and the persistence of resistant pathogens in microbial communities. We then show how different temporal patterns of resource and antibiotic supply, alongside trade-offs in competitive ability at high and low resource concentrations, can have diametrically opposing consequences for the coexistence and exclusion of resistant and susceptible strains. These insights highlight numerous opportunities for innovative experimental and theoretical research into the ecological dimensions of antibiotic resistance.
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Ohmer MEB, Costantini D, Czirják GÁ, Downs CJ, Ferguson LV, Flies A, Franklin CE, Kayigwe AN, Knutie S, Richards-Zawacki CL, Cramp RL. Applied ecoimmunology: using immunological tools to improve conservation efforts in a changing world. CONSERVATION PHYSIOLOGY 2021; 9:coab074. [PMID: 34512994 PMCID: PMC8422949 DOI: 10.1093/conphys/coab074] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 07/27/2021] [Accepted: 08/09/2021] [Indexed: 05/11/2023]
Abstract
Ecoimmunology is a rapidly developing field that explores how the environment shapes immune function, which in turn influences host-parasite relationships and disease outcomes. Host immune defence is a key fitness determinant because it underlies the capacity of animals to resist or tolerate potential infections. Importantly, immune function can be suppressed, depressed, reconfigured or stimulated by exposure to rapidly changing environmental drivers like temperature, pollutants and food availability. Thus, hosts may experience trade-offs resulting from altered investment in immune function under environmental stressors. As such, approaches in ecoimmunology can provide powerful tools to assist in the conservation of wildlife. Here, we provide case studies that explore the diverse ways that ecoimmunology can inform and advance conservation efforts, from understanding how Galapagos finches will fare with introduced parasites, to using methods from human oncology to design vaccines against a transmissible cancer in Tasmanian devils. In addition, we discuss the future of ecoimmunology and present 10 questions that can help guide this emerging field to better inform conservation decisions and biodiversity protection. From better linking changes in immune function to disease outcomes under different environmental conditions, to understanding how individual variation contributes to disease dynamics in wild populations, there is immense potential for ecoimmunology to inform the conservation of imperilled hosts in the face of new and re-emerging pathogens, in addition to improving the detection and management of emerging potential zoonoses.
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Affiliation(s)
- Michel E B Ohmer
- Living Earth Collaborative, Washington University in St. Louis, MO 63130, USA
| | - David Costantini
- Unité Physiologie Moléculaire et Adaptation (PhyMA), Muséum National d’Histoire Naturelle, CNRS, 57 Rue Cuvier, CP32, 75005, Paris, France
| | - Gábor Á Czirják
- Department of Wildlife Diseases, Leibniz Institute for Zoo and Wildlife Research, 10315 Berlin, Germany
| | - Cynthia J Downs
- Department of Environmental Biology, SUNY College of Environmental Science and Forestry, Syracuse, NY 13210, USA
| | - Laura V Ferguson
- Department of Psychology and Neuroscience, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Andy Flies
- Menzies Institute for Medical Research, University of Tasmania, Tasmania 7001, Australia
| | - Craig E Franklin
- School of Biological Sciences, The University of Queensland, Queensland 4072, Australia
| | - Ahab N Kayigwe
- Menzies Institute for Medical Research, University of Tasmania, Tasmania 7001, Australia
| | - Sarah Knutie
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06268, USA
- Institute for Systems Genomics, University of Connecticut, Storrs, CT 06268, USA
| | | | - Rebecca L Cramp
- School of Biological Sciences, The University of Queensland, Queensland 4072, Australia
- Corresponding author: School of Biological Sciences, The University of Queensland, Queensland 4072, Australia.
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Nørgaard LS, Ghedini G, Phillips BL, Hall MD. Energetic scaling across different host densities and its consequences for pathogen proliferation. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13721] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Louise Solveig Nørgaard
- School of Biological Sciences and Centre for Geometric Biology Monash University Melbourne Vic. Australia
| | - Giulia Ghedini
- School of Biological Sciences and Centre for Geometric Biology Monash University Melbourne Vic. Australia
| | - Ben L. Phillips
- Department of Biosciences University of Melbourne Parkville Vic. Australia
| | - Matthew D. Hall
- School of Biological Sciences and Centre for Geometric Biology Monash University Melbourne Vic. Australia
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OneHealth implications of infectious diseases of wild and managed bees. J Invertebr Pathol 2020; 186:107506. [PMID: 33249062 DOI: 10.1016/j.jip.2020.107506] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 10/27/2020] [Accepted: 11/20/2020] [Indexed: 01/23/2023]
Abstract
The OneHealth approach aims to further our understanding of the drivers of human, animal and environmental health, and, ultimately, to improve them by combining approaches and knowledge from medicine, biology and fields beyond. Wild and managed bees are essential pollinators of crops and wild flowers. Their health thus directly impacts on human and environmental health. At the same time, these bee species represent highly amenable and relevant model organisms for a OneHealth approach that aims to study fundamental epidemiological questions. In this review, we focus on how infectious diseases of wild and managed bees can be used as a OneHealth model system, informing fundamental questions on ecological immunology and disease transmission, while addressing how this knowledge can be used to tackle the issues facing pollinator health.
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Malishev M, Civitello DJ. Modelling how resource competition among snail hosts affects the mollusciciding frequency and intensity needed to control human schistosomes. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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50
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Timi JT, Poulin R. Why ignoring parasites in fish ecology is a mistake. Int J Parasitol 2020; 50:755-761. [PMID: 32592807 DOI: 10.1016/j.ijpara.2020.04.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 04/08/2020] [Accepted: 04/18/2020] [Indexed: 12/14/2022]
Abstract
Parasites are ubiquitous components of biological systems that have evolved in multiple independent lineages during the history of life, resulting in a diversity of taxa greater than that of their free-living counterparts. Extant host-parasite associations are the result of tight reciprocal adaptations that allow parasites to exploit specific biological features of their hosts to ensure their transmission, survival, and maintenance of viable populations. As a result, parasites may affect host physiology, morphology, reproduction or behaviour, and they are increasingly recognized as having significant impacts on host individuals, populations, communities and even ecosystems. Although this is usually acknowledged by parasite ecologists, fish ecologists often ignore parasitism in their studies, often acting as though their systems are free of parasites. However, the effects of parasites on their hosts can alter variables routinely used in fish ecology, ranging from the level of individual fish (e.g. condition factors) to populations (e.g. estimates of mortality and reproductive success) or communities (e.g. measures of interspecific competition or the structure and functioning of food webs). By affecting fish physiology, parasites can also interfere with measurements of trophic levels by means of stable isotope composition, or have antagonistic or synergistic effects with host parameters normally used as indicators of different sources of pollution. Changes in host behaviour induced by parasites can also modify host distribution patterns, habitat selection, diet composition, sexual behaviour, etc., with implications for the ecology of fish and of their predators and prey. In this review, we summarise and illustrate the likely biases and erroneous conclusions that one may expect from studies of fish ecology that ignore parasites, from the individual to the community level. Given the impact of parasites across all levels of biological organisation, we show that their omission from the design and analyses of ecological studies poses real risks of flawed interpretations for those patterns and processes that ecologists seek to uncover.
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Affiliation(s)
- Juan T Timi
- Laboratorio de Ictioparasitología, Instituto de Investigaciones Marinas y Costeras (IIMyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Funes 3350, (7600) Mar del Plata, Argentina.
| | - Robert Poulin
- Zoology Department, University of Otago, PO Box 56, Dunedin 9054, New Zealand
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