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Shaw AK, Bisesi AT, Wojan C, Kim D, Torstenson M, Naven Narayanan, Lutz P, Ales R, Shao C. Six personas to adopt when framing theoretical research questions in biology. Proc Biol Sci 2024; 291:20240803. [PMID: 39288809 PMCID: PMC11407860 DOI: 10.1098/rspb.2024.0803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 06/03/2024] [Accepted: 07/29/2024] [Indexed: 09/19/2024] Open
Abstract
Theory is a critical component of the biological research process, and complements observational and experimental approaches. However, most biologists receive little training on how to frame a theoretical question and, thus, how to evaluate when theory has successfully answered the research question. Here, we develop a guide with six verbal framings for theoretical models in biology. These correspond to different personas one might adopt as a theorist: 'Advocate', 'Explainer', 'Instigator', 'Mediator', 'Semantician' and 'Tinkerer'. These personas are drawn from combinations of two starting points (pattern or mechanism) and three foci (novelty, robustness or conflict). We illustrate each of these framings with examples of specific theoretical questions, by drawing on recent theoretical papers in the fields of ecology and evolutionary biology. We show how the same research topic can be approached from slightly different perspectives, using different framings. We show how clarifying a model's framing can debunk common misconceptions of theory: that simplifying assumptions are bad, more detail is always better, models show anything you want and modelling requires substantial maths knowledge. Finally, we provide a roadmap that researchers new to theoretical research can use to identify a framing to serve as a blueprint for their own theoretical research projects.
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Affiliation(s)
- Allison K Shaw
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
| | - Ave T Bisesi
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
| | - Chris Wojan
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
| | - Dongmin Kim
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
| | - Martha Torstenson
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
| | - Naven Narayanan
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
| | - Peter Lutz
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
- Department of Computer Science, University of Minnesota , Minneapolis, MN 55455, USA
| | - Ruby Ales
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
- Department of Mathematics, University of Minnesota , Minneapolis, MN 55455, USA
| | - Cynthia Shao
- Department of Ecology, Evolution and Behavior, University of Minnesota , St Paul, MN 55108, USA
- Department of Mathematics, University of Minnesota , Minneapolis, MN 55455, USA
- Department of Biochemistry, University of Minnesota , Minneapolis, MN 55455, USA
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2
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Shaw AK, Levet M, Binning SA. A unified evolutionary framework for understanding parasite infection and host migratory behaviour. Ecol Lett 2023; 26:1987-2002. [PMID: 37706582 DOI: 10.1111/ele.14301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 08/09/2023] [Accepted: 08/12/2023] [Indexed: 09/15/2023]
Abstract
Animal migration impacts organismal health and parasite transmission: migrants are simultaneously exposed to parasites and able to reduce infection for both individuals and populations. However, these dynamics are difficult to study; empirical studies reveal disparate results while existing theory makes assumptions that simplify natural complexity. Here, we systematically review empirical studies of migration and infection across taxa, highlighting key gaps in our understanding. Next, we develop a unified evolutionary framework incorporating different selective pressures of parasite-migration interactions while accounting for ecological complexity that goes beyond previous theory. Our framework generates diverse migration-infection patterns paralleling those seen in empirical systems, including partial and differential migration. Finally, we generate predictions about which mechanisms dominate which empirical systems to guide future studies. Our framework provides an overarching understanding of selective pressures shaping migration patterns in the context of animal health and disease, which is critical for predicting how environmental change may threaten migration.
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Affiliation(s)
- Allison K Shaw
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, USA
| | - Marie Levet
- Département de Sciences Biologiques, Université de Montréal, Montréal, Québec, Canada
| | - Sandra A Binning
- Département de Sciences Biologiques, Université de Montréal, Montréal, Québec, Canada
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3
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MacDonald H, Brisson D. Parasite-mediated selection on host phenology. Ecol Evol 2023; 13:e10107. [PMID: 37214617 PMCID: PMC10199498 DOI: 10.1002/ece3.10107] [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: 01/13/2023] [Revised: 04/30/2023] [Accepted: 05/05/2023] [Indexed: 05/24/2023] Open
Abstract
The timing of seasonal activity, or phenology, is an adaptive trait that maximizes individual fitness by timing key life events to coincide with favorable abiotic factors and biotic interactions. Studies on the biotic interactions that determine optimal phenology have focused on temporal overlaps among positively-interacting species such as mutualisms. Less well understood is the extent that negative interactions such as parasitism impact the evolution of host phenology. Here, we present a mathematical model demonstrating the evolution of host phenological patterns in response to sterilizing parasites. Environments with parasites favor hosts with shortened activity periods or greater distributions in emergence timing, both of which reduce the temporal overlap between hosts and parasites and thus reduce infection risk. Although host populations with these altered phenological patterns are less likely to mature and reproduce, the fitness advantage of parasite avoidance can be greater than the cost of reduced reproduction. These results illustrate the impact of parasitism on the evolution of host phenology and suggest that shifts in host phenology could serve as a strategy to mitigate the risk of infection.
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Affiliation(s)
| | - Dustin Brisson
- Department of BiologyUniversity of PennsylvaniaPhiladelphiaPennsylvaniaUSA
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4
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Vaughan DB, Saunders RJ, Hutson KS. How do fishes manage disease? Trends Ecol Evol 2023; 38:396-398. [PMID: 36775796 DOI: 10.1016/j.tree.2023.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/19/2023] [Accepted: 01/27/2023] [Indexed: 02/13/2023]
Abstract
Disease drives the evolution of proactive and reactive mitigation behaviours in fishes as for terrestrial animals. Understanding fish self-remedy behaviours could discover algal bioactives, reveal novel strategies for disease management, identify new habitats or ecosystems critical to population health and conservation, and enhance knowledge of interspecific evolutionary relationships and communication.
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Affiliation(s)
| | - Richard J Saunders
- University of Tasmania, Hobart, Australia; James Cook University, Townsville, Australia
| | - Kate S Hutson
- James Cook University, Townsville, Australia; Cawthron Institute, Nelson, New Zealand.
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5
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Wilkinson BP, Jodice PGR. Support for the fasting endurance hypothesis of partial migration in a nearshore seabird. Ecosphere 2023. [DOI: 10.1002/ecs2.4365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Affiliation(s)
- Bradley P. Wilkinson
- Department of Forestry and Environmental Conservation, South Carolina Cooperative Fish and Wildlife Research Unit Clemson University Clemson South Carolina USA
| | - Patrick G. R. Jodice
- U.S. Geological Survey South Carolina Cooperative Fish and Wildlife Research Unit, Department of Forestry and Environmental Conservation Clemson University Clemson South Carolina USA
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6
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Yan R, Lu M, Zhang L, Yao J, Li S, Jiang Y. Effect of sex on the gut microbiota characteristics of passerine migratory birds. Front Microbiol 2022; 13:917373. [PMID: 36118231 PMCID: PMC9478027 DOI: 10.3389/fmicb.2022.917373] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 08/05/2022] [Indexed: 11/23/2022] Open
Abstract
The gut microbiota, considered the “invisible organ” in the host animal, has been extensively studied recently. However, knowledge about the gut microbiota characteristics of passerine migratory birds during migration is limited. This study investigated the gut microbiota characteristics of three dominant migratory bird species (namely orange-flanked bluetail Tarsiger cyanurus, yellow-throated bunting Emberiza elegans, and black-faced bunting Emberiza spodocephala) in the same niche during spring migration and whether they were bird sex-specific. The compositions of gut microbiota species in these three migratory bird species and their male and female individuals were found to be similar. The main bacterial phyla were Proteobacteria, Firmicutes, Actinobacteria, and Bacteroidetes, and the main genera were Lactobacillus, Acinetobacter, Rickettsiella, and Mycobacterium; however, their relative abundance was different. Moreover, some potential pathogens and beneficial bacteria were found in all the three bird species. Alpha diversity analysis showed that in T. cyanurus, the richness and diversity of the gut microbiota were higher in male individuals than in female individuals, while the opposite was true for E. elegans and E. spodocephala. The alpha diversity analysis showed significant differences between male and female individuals of E. elegans (p < 0.05). The beta diversity analysis also revealed that the gut microbial community structure differed significantly between the male and female individuals of the three migratory bird species.
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Affiliation(s)
- Rongfei Yan
- College of Animal Science and Technology, College of Veterinary Medicine, Jilin Agricultural University, Changchun, China
| | - Meixia Lu
- School of Life Sciences, Jilin Agricultural University, Changchun, China
| | - Lishi Zhang
- College of Animal Science and Technology, College of Veterinary Medicine, Jilin Agricultural University, Changchun, China
| | - Jiyuan Yao
- College of Animal Science and Technology, College of Veterinary Medicine, Jilin Agricultural University, Changchun, China
| | - Shi Li
- College of Animal Science and Technology, College of Veterinary Medicine, Jilin Agricultural University, Changchun, China
| | - Yunlei Jiang
- College of Animal Science and Technology, College of Veterinary Medicine, Jilin Agricultural University, Changchun, China
- *Correspondence: Yunlei Jiang,
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Peacock SJ, Kutz SJ, Hoar BM, Molnár PK. Behaviour is more important than thermal performance for an Arctic host-parasite system under climate change. ROYAL SOCIETY OPEN SCIENCE 2022; 9:220060. [PMID: 36016913 PMCID: PMC9399711 DOI: 10.1098/rsos.220060] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 08/02/2022] [Indexed: 05/10/2023]
Abstract
Climate change is affecting Arctic ecosystems, including parasites. Predicting outcomes for host-parasite systems is challenging due to the complexity of multi-species interactions and the numerous, interacting pathways by which climate change can alter dynamics. Increasing temperatures may lead to faster development of free-living parasite stages but also higher mortality. Interactions between behavioural plasticity of hosts and parasites will also influence transmission processes. We combined laboratory experiments and population modelling to understand the impacts of changing temperatures on barren-ground caribou (Rangifer tarandus) and their common helminth (Ostertagia gruehneri). We experimentally determined the thermal performance curves for mortality and development of free-living parasite stages and applied them in a spatial host-parasite model that also included behaviour of the parasite (propensity for arrested development in the host) and host (long-distance migration). Sensitivity analyses showed that thermal responses had less of an impact on simulated parasite burdens than expected, and the effect differed depending on parasite behaviour. The propensity for arrested development and host migration led to distinct spatio-temporal patterns in infection. These results emphasize the importance of considering behaviour-and behavioural plasticity-when projecting climate-change impacts on host-parasite systems.
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Affiliation(s)
- Stephanie J. Peacock
- Department of Ecosystem and Public Health, University of Calgary, 3280 Hospital Drive NW, Calgary, AB Canada, T2N 4Z6
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON Canada, M1C 1A4
| | - Susan J. Kutz
- Department of Ecosystem and Public Health, University of Calgary, 3280 Hospital Drive NW, Calgary, AB Canada, T2N 4Z6
| | - Bryanne M. Hoar
- Department of Ecosystem and Public Health, University of Calgary, 3280 Hospital Drive NW, Calgary, AB Canada, T2N 4Z6
| | - Péter K. Molnár
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON Canada, M1C 1A4
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON Canada, M5S 3B2
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8
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Jithila PJ, Abaunza P, Prasadan PK. Distribution of different species of metacercariae in two freshwater fishes: Haludaria fasciata (Teleostei: Cyprinidae) and Pseudosphromenus cupanus (Teleostei: Osphromenidae). J Parasit Dis 2022; 46:113-123. [PMID: 35299924 PMCID: PMC8901812 DOI: 10.1007/s12639-021-01421-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 07/18/2021] [Indexed: 11/29/2022] Open
Abstract
Information on the distribution and abundance patterns of trematodes are essential to reveal the ecology of host-parasite interactions. The Western Ghats of India, a biodiversity hotspot, is rich in freshwater fish diversity and endemism. Though there are several studies on various other aspects of fish ecology, studies on their parasitic fauna is meager. The objective of the present study is to explore the distribution and infection patterns of metacercariae of five species of trematodes in the freshwater fishes, Haludaria fasciata and Pseudosphromenus cupanus. The infection parameters were analyzed for each host and CART model was applied to analyze the environmental factors affecting parasite distribution patterns. All species of metacercariae showed an over-dispersed aggregate distributions. The classification tree models indicated that among the environmental factors considered, differences in host locality was the most influential factor in both fishes, followed at a greater distance by the factor seasonality. The parasite communities exhibited temporal and spatial differences in the infection pattern in response to seasonal and locational variations.
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Affiliation(s)
- P. J. Jithila
- Ecological Parasitology and Tropical Biodiversity Laboratory, Department of Zoology, Kannur University, Mananthavady Campus, Wayanad, Kerala 670645 India
| | - P. Abaunza
- Instituto Español de Oceanografía (IEO), C.O. de Santander, Promontorio San Martín s/n, 39004 Santander, Cantabria Spain
| | - P. K. Prasadan
- Ecological Parasitology and Tropical Biodiversity Laboratory, Department of Zoology, Kannur University, Mananthavady Campus, Wayanad, Kerala 670645 India
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9
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Binning SA, Craft ME, Zuk M, Shaw AK. How to study parasites and host migration: a roadmap for empiricists. Biol Rev Camb Philos Soc 2022; 97:1161-1178. [DOI: 10.1111/brv.12835] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 01/15/2022] [Accepted: 01/17/2022] [Indexed: 12/15/2022]
Affiliation(s)
- Sandra A. Binning
- Département de sciences biologiques Université de Montréal 1375 Ave. Thérèse‐Lavoie‐Roux Montréal QC H2V 0B3 Canada
| | - Meggan E. Craft
- Department of Ecology, Evolution, and Behavior University of Minnesota 1479 Gortner Ave St. Paul MN 55108 U.S.A
| | - Marlene Zuk
- Department of Ecology, Evolution, and Behavior University of Minnesota 1479 Gortner Ave St. Paul MN 55108 U.S.A
| | - Allison K. Shaw
- Department of Ecology, Evolution, and Behavior University of Minnesota 1479 Gortner Ave St. Paul MN 55108 U.S.A
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10
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Cruz OMS, do Val HGP, Alves PV, de Lima GMN, de P Zucherato MC, de S Sá F, Barreto C, Teixeira ÉPT, Stehling TL, Martins NRS, Pinto HA. NEW RECORDS OF NEMATODES IN THE YELLOW-BILLED CUCKOO COCCYZUS AMERICANUS (CUCULIFORMES: CUCULIDAE) BASED ON A MIGRANT SPECIMEN FOUND IN BRAZIL. J Parasitol 2021; 107:855-862. [PMID: 34757428 DOI: 10.1645/21-35] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The yellow-billed cuckoo, Coccyzus americanus, is a threatened passerine bird native to North America that migrates to overwinter in South America. Although migratory birds have drawn broad attention, given their assumed role in the long-distance dispersal of parasites, studies on the helminth fauna of this cuculid are scarce. In the present study, nematodes found in the gastrointestinal tract of a specimen of C. americanus found in Belo Horizonte, State of Minas Gerais, southeastern Brazil, were characterized morphologically. Five species of gastrointestinal nematodes belonging to 4 families were identified: Synhimantus (Dispharynx) nasuta (Rudolphi, 1819) and Synhimantus (Dispharynx) resticulaCanavan, 1929 (Acuariidae), Microtetrameres sp. (Tetrameridae), and Cyrnea piayaeSandground, 1929 (Habronematidae) and Subulura halli Barreto, 1918 (Subuluridae). Except for Microtetrameres sp., all other nematodes are reported in this host for the first time. Although it is difficult to accurately determine the geographical origin of infections, it is important to note that Sy. (D.) resticula and Su. halli are reported for the first time in Brazil. Additionally, the absence of the former species infecting hosts where the widespread and generalist Sy. (D.) nasuta was found may indicate that Sy. (D.) resticula have either been overlooked in previous studies or that this nematode is rare indeed. Finally, the geographical distribution of Su. halli is greatly expanded and now includes the Americas. Aspects related to the dispersion of these parasites, both in migrating and native hosts, are briefly discussed.
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Affiliation(s)
- Olivia M S Cruz
- Department of Parasitology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, P.O. Box 486, Av. Pres. Antônio Carlos, 6627, Pampulha, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Helena G P do Val
- Graduate Program in Ecology, Conservation and Handling of Wildlife, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Pampulha, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Philippe V Alves
- Department of Parasitology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, P.O. Box 486, Av. Pres. Antônio Carlos, 6627, Pampulha, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Grécia M N de Lima
- Graduate Program in Genetics, Ecology and Evolution, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Pampulha, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Maria Clara de P Zucherato
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Fernanda de S Sá
- ONG WAITA Research and Conservation, Av. Waldomiro Lobo, 86, Guarani, 31814-620, Belo Horizonte, Minas Gerais, Brazil
| | - Cecília Barreto
- Brazilian Institute of the Environment and Renewable Natural Resources, Av. do Contorno, 8121, Lourdes, 30110-051, Belo Horizonte, Minas Gerais, Brazil
| | - Érika P T Teixeira
- State Forestry Institute, Cidade Administrativa Presidente Tancredo Neves - Rod. Papa João Paulo II, 4143, Serra Verde, 31630-900, Belo Horizonte, Minas Gerais, Brazil
| | - Thiago L Stehling
- State Forestry Institute, Cidade Administrativa Presidente Tancredo Neves - Rod. Papa João Paulo II, 4143, Serra Verde, 31630-900, Belo Horizonte, Minas Gerais, Brazil
| | - Nelson R S Martins
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Hudson A Pinto
- Department of Parasitology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, P.O. Box 486, Av. Pres. Antônio Carlos, 6627, Pampulha, 31270-901, Belo Horizonte, Minas Gerais, Brazil
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11
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Paterson RA, Berntsen HH, Naesje TF, Berg M, Finstad B. Factors influencing return rate and marine residence duration in sea trout populations in Central Norway. JOURNAL OF FISH BIOLOGY 2021; 99:875-887. [PMID: 33942297 DOI: 10.1111/jfb.14770] [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: 01/04/2021] [Revised: 04/14/2021] [Accepted: 04/28/2021] [Indexed: 06/12/2023]
Abstract
Brown trout (Salmo trutta) display extensive plasticity in marine migratory behaviours, with marine migrations considered to be an adaptive strategy which enables sea trout to maximize growth and reproductive potential. However, marine migrations are not without associated costs, including threats posed by ever-increasing salmon lice (Lepeophtheirus salmonis) infestations. In the present study, we used passive integrated transponder technology to characterize variability in sea trout migration behaviour amongst three catchments situated in a region of intensive salmon farming in central Norway. Specifically, we investigate how lice infestation, out-migration date and body size alter sea trout return rate and marine residence duration during the first out-migration to sea from each catchment. Distinct catchment-specific differences in sea trout out-migration size and the number of cohorts were observed, but larger body size did not guarantee the successful return of migrating trout. The marine residence duration of individuals that successfully returned to freshwater was positively correlated with lice infestation risk, suggesting for these individuals the lethal infestation threshold had not been reached. Our results also suggest that sea trout populations from lotic-dominated catchments are potentially at greater risk from size-related threats to their survival encountered during their marine migrations than sea trout from lentic-dominated catchments. The variability in sea trout migratory behaviour amongst catchments observed here emphasizes the challenges fisheries managers face when deciding the best actions to take to protect the anadromous portion of brown trout populations.
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Affiliation(s)
| | | | - Tor F Naesje
- The Norwegian Institute for Nature Research, Trondheim, Norway
| | - Marius Berg
- The Norwegian Institute for Nature Research, Trondheim, Norway
| | - Bengt Finstad
- The Norwegian Institute for Nature Research, Trondheim, Norway
- Department of Biology, NTNU Centre of Fisheries and Aquaculture, Trondheim, Norway
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12
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Conspecific migration and environmental setting determine parasite infracommunities of non-migratory individual fish. Parasitology 2021; 148:1057-1066. [PMID: 34027845 PMCID: PMC8273861 DOI: 10.1017/s0031182021000780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Parasite infracommunities tend to be stochastic in nature, although environmental characteristics such as the type of water source in streams and host traits can have an effect on the biotic assemblages and by extension the parasite fauna. We examined the effect of water source and the rate of adult fish migration on the metazoan parasite infracommunities of conspecific juvenile brown trout, Salmo trutta L. among streams flowing into Lake Lucerne (Switzerland). Juvenile (1 to 2-year old) fish harboured higher parasite species richness in groundwater-fed than in surface water-fed streams, whereas the rate of fish migration did not affect infracommunity richness. Heteroxenous species were more common in groundwater-fed streams with high and medium rates of trout migration, whereas infracommunities in surface water-fed streams and streams with low rates of fish migration were dominated by one monoxenous parasite or lacked infections. Similarity in the parasite infracommunity composition of juvenile trout across streams was explained by the interaction between type of water source and adult migration rates. Our conclusions support that similarity in the parasite composition of resident freshwater conspecifics can be predicted by the local environmental settings and host migratory behaviour, whereas parasite richness is mainly influenced by the environmental characteristics.
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de Angeli Dutra D, Fecchio A, Martins Braga É, Poulin R. Migratory birds have higher prevalence and richness of avian haemosporidian parasites than residents. Int J Parasitol 2021; 51:877-882. [PMID: 33848498 DOI: 10.1016/j.ijpara.2021.03.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 03/02/2021] [Indexed: 02/06/2023]
Abstract
Individuals of migratory species may be more likely to become infected by parasites because they cross different regions along their route, thereby being exposed to a wider range of parasites during their annual cycle. Conversely, migration may have a protective effect since migratory behaviour allows hosts to escape environments presenting a high risk of infection. Haemosporidians are one of the best studied, most prevalent and diverse groups of avian parasites, however the impact of avian host migration on infection by these parasites remains controversial. We tested whether migratory behaviour influenced the prevalence and richness of avian haemosporidian parasites among South American birds. We used a dataset comprising ~ 11,000 bird blood samples representing 260 bird species from 63 localities and Bayesian multi-level models to test the impact of migratory behaviour on prevalence and lineage richness of two avian haemosporidian genera (Plasmodium and Haemoproteus). We found that fully migratory species present higher parasite prevalence and higher richness of haemosporidian lineages. However, we found no difference between migratory and non-migratory species when evaluating prevalence separately for Plasmodium and Haemoproteus, or for the richness of Plasmodium lineages. Nevertheless, our results indicate that migratory behaviour is associated with an infection cost, namely a higher prevalence and greater variety of haemosporidian parasites.
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Affiliation(s)
| | - Alan Fecchio
- Programa de Pós-graduação em Ecologia e Conservação da Biodiversidade, Universidade Federal de Mato Grosso, Cuiabá, MT 78060-900, Brazil
| | - Érika Martins Braga
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Brazil
| | - Robert Poulin
- Department of Zoology, University of Otago, Dunedin, New Zealand
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14
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de Angeli Dutra D, Filion A, Fecchio A, Braga ÉM, Poulin R. Migrant birds disperse haemosporidian parasites and affect their transmission in avian communities. OIKOS 2021. [DOI: 10.1111/oik.08199] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
| | | | - Alan Fecchio
- Programa de Pós‐graduação em Ecologia e Conservação da Biodiversidade, Univ. Federal de Mato Grosso Cuiabá Brazil
| | - Érika Martins Braga
- Depto de Parasitologia, Inst. de Ciências Biológicas, Univ. Federal de Minas Gerais Brazil
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15
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Poulin R, de Angeli Dutra D. Animal migrations and parasitism: reciprocal effects within a unified framework. Biol Rev Camb Philos Soc 2021; 96:1331-1348. [PMID: 33663012 DOI: 10.1111/brv.12704] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 02/22/2021] [Accepted: 02/23/2021] [Indexed: 12/28/2022]
Abstract
Migrations, i.e. the recurring, roundtrip movement of animals between distant and distinct habitats, occur among diverse metazoan taxa. Although traditionally linked to avoidance of food shortages, predators or harsh abiotic conditions, there is increasing evidence that parasites may have played a role in the evolution of migration. On the one hand, selective pressures from parasites can favour migratory strategies that allow either avoidance of infections or recovery from them. On the other hand, infected animals incur physiological costs that may limit their migratory abilities, affecting their speed, the timing of their departure or arrival, and/or their condition upon reaching their destination. During migration, reduced immunocompetence as well as exposure to different external conditions and parasite infective stages can influence infection dynamics. Here, we first explore whether parasites represent extra costs for their hosts during migration. We then review how infection dynamics and infection risk are affected by host migration, thereby considering parasites as both causes and consequences of migration. We also evaluate the comparative evidence testing the hypothesis that migratory species harbour a richer parasite fauna than their closest free-living relatives, finding general support for the hypothesis. Then we consider the implications of host migratory behaviour for parasite ecology and evolution, which have received much less attention. Parasites of migratory hosts may achieve much greater spatial dispersal than those of non-migratory hosts, expanding their geographical range, and providing more opportunities for host-switching. Exploiting migratory hosts also exerts pressures on the parasite to adapt its phenology and life-cycle duration, including the timing of major developmental, reproduction and transmission events. Natural selection may even favour parasites that manipulate their host's migratory strategy in ways that can enhance parasite transmission. Finally, we propose a simple integrated framework based on eco-evolutionary feedbacks to consider the reciprocal selection pressures acting on migratory hosts and their parasites. Host migratory strategies and parasite traits evolve in tandem, each acting on the other along two-way causal paths and feedback loops. Their likely adjustments to predicted climate change will be understood best from this coevolutionary perspective.
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Affiliation(s)
- Robert Poulin
- Department of Zoology, University of Otago, P.O. Box 56, Dunedin, New Zealand
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16
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Rayl ND, Merkle JA, Proffitt KM, Almberg ES, Jones JD, Gude JA, Cross PC. Elk migration influences the risk of disease spillover in the Greater Yellowstone Ecosystem. J Anim Ecol 2021; 90:1264-1275. [PMID: 33630313 PMCID: PMC8251637 DOI: 10.1111/1365-2656.13452] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Accepted: 11/16/2020] [Indexed: 11/30/2022]
Abstract
Wildlife migrations provide important ecosystem services, but they are declining. Within the Greater Yellowstone Ecosystem (GYE), some elk Cervus canadensis herds are losing migratory tendencies, which may increase spatiotemporal overlap between elk and livestock (domestic bison Bison bison and cattle Bos taurus), potentially exacerbating pathogen transmission risk. We combined disease, movement, demographic and environmental data from eight elk herds in the GYE to examine the differential risk of brucellosis transmission (through aborted foetuses) from migrant and resident elk to livestock. For both migrants and residents, we found that transmission risk from elk to livestock occurred almost exclusively on private ranchlands as opposed to state or federal grazing allotments. Weather variability affected the estimated distribution of spillover risk from migrant elk to livestock, with a 7%–12% increase in migrant abortions on private ranchlands during years with heavier snowfall. In contrast, weather variability did not affect spillover risk from resident elk. Migrant elk were responsible for the majority (68%) of disease spillover risk to livestock because they occurred in greater numbers than resident elk. On a per‐capita basis, however, our analyses suggested that resident elk disproportionately contributed to spillover risk. In five of seven herds, we estimated that the per‐capita spillover risk was greater from residents than from migrants. Averaged across herds, an individual resident elk was 23% more likely than an individual migrant elk to abort on private ranchlands. Our results demonstrate links between migration behaviour, spillover risk and environmental variability, and highlight the utility of integrating models of pathogen transmission and host movement to generate new insights about the role of migration in disease spillover risk. Furthermore, they add to the accumulating body of evidence across taxa that suggests that migrants and residents should be considered separately during investigations of wildlife disease ecology. Finally, our findings have applied implications for elk and brucellosis in the GYE. They suggest that managers should prioritize actions that maintain spatial separation of elk and livestock on private ranchlands during years when snowpack persists into the risk period.
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Affiliation(s)
- Nathaniel D Rayl
- Colorado Parks and Wildlife, Grand Junction, CO, USA.,U.S. Geological Survey, Northern Rocky Mountain Science Center, Bozeman, MT, USA
| | - Jerod A Merkle
- Department of Zoology and Physiology, University of Wyoming, Laramie, WY, USA
| | | | | | | | | | - Paul C Cross
- U.S. Geological Survey, Northern Rocky Mountain Science Center, Bozeman, MT, USA
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17
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Abstract
The COVID-19 pandemic imposed new norms on human interactions, perhaps best reflected in the widespread application of social distancing. But social distancing is not a human invention and has evolved independently in species as dissimilar as apes and lobsters. Epidemics are common in the wild, where their spread is enhanced by animal movement and sociality while curtailed by population fragmentation, host behavior, and the immune systems of hosts. In the present article, we explore the phenomenon of behavioral immunity in wild animals as compared with humans and its relevance to the control of disease in nature. We start by explaining the evolutionary benefits and risks of sociality, look at how pathogens have shaped animal evolution, and provide examples of pandemics in wild animal populations. Then we review the known occurrences of social distancing in wild animals, the cues used to enforce it, and its efficacy in controlling the spread of diseases in nature.
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Affiliation(s)
- Mark J Butler
- Institute of Environment and Department of Biological Sciences, Florida International University, Miami, Florida, United States
| | - Donald C Behringer
- Emerging Pathogens Institute and Fisheries and Aquatic Sciences Program, University of Florida, Gainesville, Florida, United States
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18
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Balstad LJ, Binning SA, Craft ME, Zuk M, Shaw AK. Parasite intensity and the evolution of migratory behavior. Ecology 2020; 102:e03229. [PMID: 33098657 DOI: 10.1002/ecy.3229] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 07/23/2020] [Accepted: 08/17/2020] [Indexed: 11/11/2022]
Abstract
Migration can allow individuals to escape parasite infection, which can lead to a lower infection probability (prevalence) in a population and/or fewer parasites per individual (intensity). Because individuals with more parasites often have lower survival and/or fecundity, infection intensity shapes the life-history trade-offs determining when migration is favored as a strategy to escape infection. Yet, most theory relies on susceptible-infected (SI) modeling frameworks, defining individuals as either healthy or infected, ignoring details of infection intensity. Here, we develop a novel modeling approach that captures infection intensity as a spectrum, and ask under what conditions migration evolves as function of how infection intensity changes over time. We show that relative timescales of migration and infection accumulation determine when migration is favored. We also find that population-level heterogeneity in infection intensity can lead to partial migration, where less-infected individuals migrate while more infected individuals remain resident. Our model is one of the first to consider how infection intensity can lead to migration. Our results frame migratory escape in light of infection intensity rather than prevalence, thus demonstrating that decreased infection intensity should be considered a benefit of migration, alongside other typical drivers of migration.
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Affiliation(s)
- Laurinne J Balstad
- Department of Mathematics and Department of Biology, St. Olaf College, Northfield, Minnesota, 55057, USA
| | - Sandra A Binning
- Département de sciences biologiques, Université de Montréal, Montréal, Québec, Canada
| | - Meggan E Craft
- Department of Veterinary Population Medicine, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Marlene Zuk
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul,, Minnesota, 55108, USA
| | - Allison K Shaw
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul,, Minnesota, 55108, USA
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19
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Zamora-Mejías D, Morales-Malacara JB, Rodríguez-Herrera B, Ojeda M, Medellín RA. Does latitudinal migration represent an advantage in the decrease of ectoparasitic loads in Leptonycteris yerbabuenae (Chiroptera)? J Mammal 2020. [DOI: 10.1093/jmammal/gyaa075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Latitudinal migration increases fitness of migrants by allowing them to exploit favorable conditions in nonadjacent geographic regions. Other consequences also may follow, such as interactions with parasites. Migrants may have lower parasite prevalence and abundance than resident individuals because of their ability to abandon infested areas or due to mortality of highly infested hosts. To further understand whether variation in ectoparasite loads is influenced by migration, we investigated whether prevalence and abundance of two species of obligate ectoparasites, the wing mite Periglischrus paracaligus (Mesostigmata: Spinturnicidae) and the bat fly Nycterophilia coxata (Diptera: Streblidae, Nycterophiliinae), of the lesser long-nosed bat, Leptonycteris yerbabuenae, varied between migratory and resident populations throughout their range in Mexico. We examined the presence or absence of migratory behavior, as well as sex and reproductive status of the host because ectoparasitism differentially affects the sexes. Our results showed that the prevalence of both ectoparasites did not vary between migrant and resident females or males, but abundance of the wing mite P. paracaligus was lower in migrant females compared with resident females, with an important influence from the reproductive status of the host. A partial negative relationship between ectoparasite loads and latitudinal migration therefore was demonstrated.
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Affiliation(s)
- Daniel Zamora-Mejías
- Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, México D.F., México
- Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad Universitaria, México
| | - Juan B Morales-Malacara
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Campus Juriquilla, Universidad Nacional Autónoma de México, Querétaro, México
| | | | - Margarita Ojeda
- Laboratorio de Ecología y Sistemática de Microartrópodos, Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, Coyoacán, Ciudad Universitaria, Ciudad de México, México
| | - Rodrigo A Medellín
- Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad Universitaria, México
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20
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Naven Narayanan, Binning SA, Shaw AK. Infection state can affect host migratory decisions. OIKOS 2020. [DOI: 10.1111/oik.07188] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Naven Narayanan
- Ecology, Evolution and Behavior, Ecology Building, Univ. of Minnesota Twin Cities‐ E 1987 Upper Buford Cir Saint Paul MN 55108 USA
| | | | - Allison K. Shaw
- Ecology, Evolution and Behavior, Ecology Building, Univ. of Minnesota Twin Cities‐ E 1987 Upper Buford Cir Saint Paul MN 55108 USA
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21
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Poulin R, Bennett J, de Angeli Dutra D, Doherty JF, Filion A, Park E, Ruehle B. Evolutionary Signature of Ancient Parasite Pressures, or the Ghost of Parasitism Past. Front Ecol Evol 2020. [DOI: 10.3389/fevo.2020.00195] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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22
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A unifying framework for the transient parasite dynamics of migratory hosts. Proc Natl Acad Sci U S A 2020; 117:10897-10903. [PMID: 32358200 DOI: 10.1073/pnas.1908777117] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Migrations allow animals to track seasonal changes in resources, find mates, and avoid harsh climates, but these regular, long-distance movements also have implications for parasite dynamics and animal health. Migratory animals have been dubbed "superspreaders" of infection, but migration can also reduce parasite burdens within host populations via migratory escape from contaminated habitats and transmission hotspots, migratory recovery due to parasite mortality, and migratory culling of infected individuals. Here, we show that a single migratory host-macroparasite model can give rise to these different phenomena under different parametrizations, providing a unifying framework for a mechanistic understanding of the parasite dynamics of migratory animals. Importantly, our model includes the impact of parasite burden on host movement capability during migration, which can lead to "parasite-induced migratory stalling" due to a positive feedback between increasing parasite burdens and reduced movement. Our results provide general insight into the conditions leading to different health outcomes in migratory wildlife. Our approach lays the foundation for tactical models that can help understand, predict, and mitigate future changes of disease risk in migratory wildlife that may arise from shifting migratory patterns, loss of migratory behavior, or climate effects on parasite development, mortality, and transmission.
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23
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Shaw AK, Binning SA. Recovery from infection is more likely to favour the evolution of migration than social escape from infection. J Anim Ecol 2020; 89:1448-1457. [PMID: 32115700 DOI: 10.1111/1365-2656.13195] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 01/17/2020] [Indexed: 12/24/2022]
Abstract
Pathogen and parasite infections are increasingly recognized as powerful drivers of animal movement, including migration. Yet, infection-related migration benefits can result from a combination of environmental and/or social conditions, which can be difficult to disentangle. Here, we focus on two infection-related mechanisms that can favour migration: moving to escape versus recover from infection. By directly comparing the evolution of migration in response to each mechanism, we can evaluate the likely importance of changing abiotic conditions (linked to migratory recovery) with changing social conditions (linked to migratory escape) in terms of infection-driven migration. We built a mathematical model and analysed it using numerically simulated adaptive dynamics to determine when migration should evolve for each migratory recovery and social migratory escape. We found that a higher fraction of the population migrated under migratory recovery than under social migratory escape. We also found that two distinct migratory strategies (e.g. some individuals always migrate and others only occasionally migrate) sometimes coexisted within populations with social migratory escape, but never with migratory recovery. Our results suggest that migratory recovery is more likely to promote the evolution of migratory behaviour, rather than escape from infected conspecifics (social migratory escape).
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Affiliation(s)
- Allison K Shaw
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, USA
| | - Sandra A Binning
- Département de sciences biologiques, Université de Montréal, Montréal, QC, Canada
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24
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Saboret G, Ingram T. Carryover effects of larval environment on individual variation in a facultatively diadromous fish. Ecol Evol 2019; 9:10630-10643. [PMID: 31624571 PMCID: PMC6787821 DOI: 10.1002/ece3.5582] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 07/11/2019] [Accepted: 07/22/2019] [Indexed: 01/04/2023] Open
Abstract
Intraspecific trait variation may result from "carryover effects" of variability of environments experienced at an earlier life stage. This phenomenon is particularly relevant in partially migrating populations composed of individuals with divergent early life histories. While many studies have addressed the causes of partial migration, few have investigated the consequences for between-individual variability later in life.We studied carryover effects of larval environment in a facultatively diadromous New Zealand fish, Gobiomorphus cotidianus, along an estuarine salinity gradient. We investigated the implications of varying environmental conditions during this critical stage of ontogeny for adult phenotype.We inferred past environmental history of wild-caught adult fish using otolith microchemistry (Sr/Ca) as a proxy for salinity. We tested for main and interactive effects of larval and adult environment on a suite of traits, including growth rates, behavior (exploration and activity), parasite load, and diet (stable isotopes and gut contents).We found a Sr/Ca consistent with a continuum from freshwater to brackish environments, and with different trajectories from juvenile to adult habitat. Fish with Sr/Ca indicating upstream migration were more vulnerable to trematode infection, suggesting a mismatch to freshwater habitat. Diet analysis suggested an interactive effect of larval and adult environments on trophic position and diet preference, while behavioral traits were unrelated to environment at any life stage. Growth rates did not seem to be affected by past environment.Overall, we show that early life environment can have multiple effects on adult performance and ecology, with the potential for lifetime fitness trade-offs associated with life history. Our study highlights that even relatively minor variation in rearing conditions may be enough to generate individual variation in natural populations.
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Affiliation(s)
- Grégoire Saboret
- Département de Biologie, Master BiosciencesENS de LyonLyonFrance
| | - Travis Ingram
- Department of ZoologyUniversity of OtagoDunedinNew Zealand
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25
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Shaw AK, Craft ME, Zuk M, Binning SA. Host migration strategy is shaped by forms of parasite transmission and infection cost. J Anim Ecol 2019; 88:1601-1612. [PMID: 31220346 DOI: 10.1111/1365-2656.13050] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 05/10/2019] [Indexed: 01/01/2023]
Abstract
Most studies on the evolution of migration focus on food, mates and/or climate as factors influencing these movements, whereas negative species interactions such as predators, parasites and pathogens are often ignored. Although infection and its associated costs clearly have the potential to influence migration, thoroughly studying these interactions is challenging without a solid theoretical framework from which to develop testable predictions in natural systems. Here, we aim to understand when parasites favour the evolution of migration. We develop a general model which enables us to explore a broad range of biological conditions and to capture population and infection dynamics over both ecological and evolutionary time-scales. We show that when migration evolves depends on whether the costs of migration and infection are paid in reduced fecundity or survival. Also important are the parasite transmission mode and spatiotemporal dynamics of infection and recovery (if it occurs). Finally, we find that partial migration (where only a fraction of the population migrates) can evolve but only when parasite transmission is density-dependent. Our results highlight the critical, if overlooked, role of parasites in shaping long-distance movement patterns, and suggest that infection should be considered alongside more traditional drivers of migration in both empirical and theoretical studies.
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Affiliation(s)
- Allison K Shaw
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota
| | - Meggan E Craft
- Department of Veterinary Population Medicine, University of Minnesota, St. Paul, Minnesota
| | - Marlene Zuk
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota
| | - Sandra A Binning
- Département de Sciences Biologiques, Université de Montréal, Montréal, Quebec, Canada
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26
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Behringer DC, Karvonen A, Bojko J. Parasite avoidance behaviours in aquatic environments. Philos Trans R Soc Lond B Biol Sci 2019; 373:rstb.2017.0202. [PMID: 29866915 DOI: 10.1098/rstb.2017.0202] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2018] [Indexed: 02/05/2023] Open
Abstract
Parasites, including macroparasites, protists, fungi, bacteria and viruses, can impose a heavy burden upon host animals. However, hosts are not without defences. One aspect of host defence, behavioural avoidance, has been studied in the terrestrial realm for over 50 years, but was first reported from the aquatic environment approximately 20 years ago. Evidence has mounted on the importance of parasite avoidance behaviours and it is increasingly apparent that there are core similarities in the function and benefit of this defence mechanism between terrestrial and aquatic systems. However, there are also stark differences driven by the unique biotic and abiotic characteristics of terrestrial and aquatic (marine and freshwater) environments. Here, we review avoidance behaviours in a comparative framework and highlight the characteristics of each environment that drive differences in the suite of mechanisms and cues that animals use to avoid parasites. We then explore trade-offs, potential negative effects of avoidance behaviour and the influence of human activities on avoidance behaviours. We conclude that avoidance behaviours are understudied in aquatic environments but can have significant implications for disease ecology and epidemiology, especially considering the accelerating emergence and re-emergence of parasites.This article is part of the Theo Murphy meeting issue 'Evolution of pathogen and parasite avoidance behaviours'.
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Affiliation(s)
- Donald C Behringer
- School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, University of Florida, Gainesville, FL, USA .,Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
| | - Anssi Karvonen
- Department of Biological and Environmental Science, University of Jyvaskyla, PO Box 35, 40014 Jyvaskyla, Finland
| | - Jamie Bojko
- School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, University of Florida, Gainesville, FL, USA.,Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
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27
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Bush SE, Clayton DH. Anti-parasite behaviour of birds. Philos Trans R Soc Lond B Biol Sci 2019; 373:rstb.2017.0196. [PMID: 29866911 DOI: 10.1098/rstb.2017.0196] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/02/2018] [Indexed: 11/12/2022] Open
Abstract
Birds have many kinds of internal and external parasites, including viruses, bacteria and fungi, as well as protozoa, helminths and arthropods. Because parasites have negative effects on host fitness, selection favours the evolution of anti-parasite defences, many of which involve behaviour. We provide a brief review of anti-parasite behaviours in birds, divided into five major categories: (i) body maintenance, (ii) nest maintenance, (iii) avoidance of parasitized prey, (iv) migration and (v) tolerance. We evaluate the adaptive significance of the different behaviours and note cases in which additional research is particularly needed. We briefly consider the interaction of different behaviours, such as sunning and preening, and how behavioural defences may interact with other forms of defence, such as immune responses. We conclude by suggesting some general questions that need to be addressed concerning the nature of anti-parasite behaviour in birds.This article is part of the Theo Murphy meeting issue 'Evolution of pathogen and parasite avoidance behaviours'.
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Affiliation(s)
- Sarah E Bush
- Department of Biology, University of Utah, Salt Lake City, UT 84112, USA
| | - Dale H Clayton
- Department of Biology, University of Utah, Salt Lake City, UT 84112, USA
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28
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Shaw AK, Sherman J, Barker FK, Zuk M. Metrics matter: the effect of parasite richness, intensity and prevalence on the evolution of host migration. Proc Biol Sci 2018; 285:rspb.2018.2147. [PMID: 30429312 DOI: 10.1098/rspb.2018.2147] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 10/26/2018] [Indexed: 12/25/2022] Open
Abstract
Parasites have long been thought to influence the evolution of migration, but precisely determining the conditions under which this occurs by quantifying costs of infection remains a challenge. Here we developed a model that demonstrates how the metric used to describe infection (richness/diversity, prevalence or intensity) shapes the prediction of whether migration will evolve. The model shows that predictions based on minimizing richness yield opposite results compared to those based on minimizing prevalence, with migration only selected for when minimizing prevalence. Consistent with these findings, empirical studies that measure parasite diversity typically find that migrants are worse off than residents, while those measuring prevalence or intensity find the opposite. Our own empirical analysis of fish parasite data finds that migrants (of all types) have higher parasite richness than residents, but with no significant difference in either prevalence or intensity.
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Affiliation(s)
- Allison K Shaw
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN 55108, USA
| | - Julie Sherman
- Department of Mathematics, University of Minnesota, Minneapolis, MN 55455, USA
| | - F Keith Barker
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN 55108, USA.,Bell Museum of Natural History, University of Minnesota, St Paul, MN 55108, USA
| | - Marlene Zuk
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN 55108, USA
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29
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Satterfield DA, Maerz JC, Hunter MD, Flockhart DTT, Hobson KA, Norris DR, Streit H, de Roode JC, Altizer S. Migratory monarchs that encounter resident monarchs show life-history differences and higher rates of parasite infection. Ecol Lett 2018; 21:1670-1680. [PMID: 30152196 DOI: 10.1111/ele.13144] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 07/27/2018] [Indexed: 01/24/2023]
Abstract
Environmental change induces some wildlife populations to shift from migratory to resident behaviours. Newly formed resident populations could influence the health and behaviour of remaining migrants. We investigated migrant-resident interactions among monarch butterflies and consequences for life history and parasitism. Eastern North American monarchs migrate annually to Mexico, but some now breed year-round on exotic milkweed in the southern US and experience high infection prevalence of protozoan parasites. Using stable isotopes (δ2 H, δ13 C) and cardenolide profiles to estimate natal origins, we show that migrant and resident monarchs overlap during fall and spring migration. Migrants at sites with residents were 13 times more likely to have infections and three times more likely to be reproductive (outside normal breeding season) compared to other migrants. Exotic milkweed might either attract migrants that are already infected or reproductive, or alternatively, induce these states. Increased migrant-resident interactions could affect monarch parasitism, migratory success and long-term conservation.
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Affiliation(s)
| | - John C Maerz
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, 30602, USA
| | - Mark D Hunter
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - D T Tyler Flockhart
- Departmment of Integrative Biology, University of Guelph, Guelph, ON, N1G2W1, Canada
| | - Keith A Hobson
- Department of Biology, Western University, London, ON, N6A5B7, Canada
| | - D Ryan Norris
- Departmment of Integrative Biology, University of Guelph, Guelph, ON, N1G2W1, Canada
| | - Hillary Streit
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | | | - Sonia Altizer
- Odum School of Ecology, University of Georgia, Athens, GA, 30602, USA
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30
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Slowinski SP, Fudickar AM, Hughes AM, Mettler RD, Gorbatenko OV, Spellman GM, Ketterson ED, Atwell JW. Sedentary songbirds maintain higher prevalence of haemosporidian parasite infections than migratory conspecifics during seasonal sympatry. PLoS One 2018; 13:e0201563. [PMID: 30133475 PMCID: PMC6104930 DOI: 10.1371/journal.pone.0201563] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Accepted: 07/17/2018] [Indexed: 01/01/2023] Open
Abstract
Long-distance migrations influence the physiology, behavior, and fitness of migratory animals throughout their annual cycles, and fundamentally alter their interactions with parasites. Several hypotheses relating migratory behavior to the likelihood of parasitism have entered the literature, making conflicting, testable predictions. To assess how migratory behavior of hosts is associated with parasitism, we compared haemosporidian parasite infections between two closely related populations of a common North American sparrow, the dark-eyed junco, that co-occur in shared habitats during the non-breeding season. One population is sedentary and winters and breeds in the Appalachian Mountains. The other population is migratory and is found in seasonal sympatry with the sedentary population from October through April, but then flies (≥ 900 km) northwards to breed. The populations were sampled in the wild on the shared montane habitat at the beginning of winter and again after confining them in a captive common environment until the spring. We found significantly higher prevalence of haemosporidian parasite infections in the sedentary population. Among infected juncos, we found no difference in parasite densities (parasitemias) between the sedentary and migrant populations and no evidence for winter dormancy of the parasites. Our results suggest that long-distance migration may reduce the prevalence of parasite infections at the population level. Our results are inconsistent with the migratory exposure hypothesis, which posits that long-distance migration increases exposure of hosts to diverse parasites, and with the migratory susceptibility hypothesis, which posits that trade-offs between immune function and migration increase host susceptibility to parasites. However, our results are consistent with the migratory culling hypothesis, which posits that heavily infected animals are less likely to survive long-distance migration, and with the migratory escape hypothesis, which posits that long-distance migration allows host populations to seasonally escape areas of high infection risk.
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Affiliation(s)
- Samuel P. Slowinski
- Department of Biology, Indiana University, Bloomington, IN, United States of America
- * E-mail:
| | - Adam M. Fudickar
- Environmental Resilience Institute, Indiana University, Bloomington, IN, United States of America
| | - Alex M. Hughes
- Department of Biology, Indiana University, Bloomington, IN, United States of America
| | - Raeann D. Mettler
- School of Natural Sciences, Black Hills State University, Spearfish, SD, United States of America
| | - Oxana V. Gorbatenko
- School of Natural Sciences, Black Hills State University, Spearfish, SD, United States of America
| | - Garth M. Spellman
- Zoology Department, Denver Museum of Nature and Science, Denver, CO, United States of America
| | - Ellen D. Ketterson
- Department of Biology, Indiana University, Bloomington, IN, United States of America
- Environmental Resilience Institute, Indiana University, Bloomington, IN, United States of America
| | - Jonathan W. Atwell
- Department of Biology, Indiana University, Bloomington, IN, United States of America
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31
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Daversa DR, Fenton A, Dell AI, Garner TWJ, Manica A. Infections on the move: how transient phases of host movement influence disease spread. Proc Biol Sci 2018; 284:rspb.2017.1807. [PMID: 29263283 PMCID: PMC5745403 DOI: 10.1098/rspb.2017.1807] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 11/20/2017] [Indexed: 11/12/2022] Open
Abstract
Animal movement impacts the spread of human and wildlife diseases, and there is significant interest in understanding the role of migrations, biological invasions and other wildlife movements in spatial infection dynamics. However, the influence of processes acting on infections during transient phases of host movement is poorly understood. We propose a conceptual framework that explicitly considers infection dynamics during transient phases of host movement to better predict infection spread through spatial host networks. Accounting for host transient movement captures key processes that occur while hosts move between locations, which together determine the rate at which hosts spread infections through networks. We review theoretical and empirical studies of host movement and infection spread, highlighting the multiple factors that impact the infection status of hosts. We then outline characteristics of hosts, parasites and the environment that influence these dynamics. Recent technological advances provide disease ecologists unprecedented ability to track the fine-scale movement of organisms. These, in conjunction with experimental testing of the factors driving infection dynamics during host movement, can inform models of infection spread based on constituent biological processes.
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Affiliation(s)
- D R Daversa
- Institute of Integrative Biology, Biosciences Building, University of Liverpool, Crown Street, Liverpool L69 7ZB, UK .,Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, UK.,Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK
| | - A Fenton
- Institute of Integrative Biology, Biosciences Building, University of Liverpool, Crown Street, Liverpool L69 7ZB, UK
| | - A I Dell
- National Great Rivers Research and Education Centre (NGRREC), East Alton, IL 62024, USA.,Department of Biology, Washington University in St Louis, 1 Brookings Dr, St Louis, MO 63130, USA
| | - T W J Garner
- Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, UK
| | - A Manica
- Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK
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32
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Christie MR, Searle CL. Evolutionary rescue in a host-pathogen system results in coexistence not clearance. Evol Appl 2018; 11:681-693. [PMID: 29875810 PMCID: PMC5979755 DOI: 10.1111/eva.12568] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 10/17/2017] [Indexed: 01/14/2023] Open
Abstract
The evolutionary rescue of host populations may prevent extinction from novel pathogens. However, the conditions that facilitate rapid evolution of hosts, in particular the population variation in host susceptibility, and the effects of host evolution in response to pathogens on population outcomes remain largely unknown. We constructed an individual-based model to determine the relationships between genetic variation in host susceptibility and population persistence in an amphibian-fungal pathogen (Batrachochytrium dendrobatidis) system. We found that host populations can rapidly evolve reduced susceptibility to a novel pathogen and that this rapid evolution led to a 71-fold increase in the likelihood of host-pathogen coexistence. However, the increased rates of coexistence came at a cost to host populations; fewer populations cleared infection, population sizes were depressed, and neutral genetic diversity was lost. Larger adult host population sizes and greater adaptive genetic variation prior to the onset of pathogen introduction led to substantially reduced rates of extinction, suggesting that populations with these characteristics should be prioritized for conservation when species are threatened by novel infectious diseases.
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Affiliation(s)
- Mark Redpath Christie
- Department of Biological SciencesPurdue UniversityWest LafayetteINUSA
- Department of Forestry and Natural ResourcesPurdue UniversityWest LafayetteINUSA
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33
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Padrós F, Knudsen R, Blasco-Costa I. Histopathological characterisation of retinal lesions associated to Diplostomum species (Platyhelminthes: Trematoda) infection in polymorphic Arctic charr Salvelinus alpinus. INTERNATIONAL JOURNAL FOR PARASITOLOGY-PARASITES AND WILDLIFE 2018; 7:68-74. [PMID: 29988817 PMCID: PMC6032039 DOI: 10.1016/j.ijppaw.2018.01.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 01/12/2018] [Accepted: 01/20/2018] [Indexed: 01/01/2023]
Abstract
The eye represents an immune privileged organ where parasites can escape host reactions. This study provides the first systematic evidence of the pathology associated with Diplostomum sp. infection in the eye retina of fish (i.e. Arctic charr). Histological sections showed that the trematodes caused mechanical disengagement between the retinal pigmentary epithelium and the neurosensory retina, with damaged cones and rods in the outer segment and epithelium reduced to a single layer of pigmentary cells. The metacercariae were “floating” in possibly fluid-filled vesicles together with several round cells, mostly located in the anterio-dorsal and anterio-ventral areas of the eye near the iris. The round cells may indicate internal retinal damage repair mechanisms, without connections to the general immune system. Metacercariae intestines contained pigmented cellular debris indicating that they feed on retinal epithelium. These retinal lesions may have similar vision effects as focal retinal detachment in vertebrates. Diplostomum metacercaria alters fish visual acuity but may in a lesser degree lead to a severe or total visual impairment because of repairing mechanisms. The pathology in the retina seems thereby to be dependent on fish size, age and dose. Histological description of the distribution of Diplostomum in the eye of Arctic charr Salvelinus alpinus. Metacercaria specifically located in spaces formed between the retinal pigmentary epithelium and the neurosensory retina. Lesions display closer similarities with those observed in retinal detachment in other species. Changes in the frequency and distribution of the lesions between morphs are suggested.
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Affiliation(s)
- F Padrós
- Fish Diseases Diagnostic Service, BAVE, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Barcelona, Spain
| | - R Knudsen
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Langnes, P.O. Box 6050, 9037 Tromsø, Norway
| | - I Blasco-Costa
- Natural History Museum of Geneva, PO Box 6434, CH-1211 Geneva 6, Switzerland
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Fritzsche McKay A, Hoye BJ. Are Migratory Animals Superspreaders of Infection? Integr Comp Biol 2017; 56:260-7. [PMID: 27462034 DOI: 10.1093/icb/icw054] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Migratory animals are simultaneously challenged by the physiological demands of long-distance movements and the need to avoid natural enemies including parasites and pathogens. The potential for animal migrations to disperse pathogens across large geographic areas has prompted a growing body of research investigating the interactions between migration and infection. However, the phenomenon of animal migration is yet to be incorporated into broader theories in disease ecology. Because migrations may expose animals to a greater number and diversity of pathogens, increase contact rates between hosts, and render them more susceptible to infection via changes to immune function, migration has the potential to generate both "superspreader species" and infection "hotspots". However, migration has also been shown to reduce transmission in some species, by facilitating parasite avoidance ("migratory escape") and weeding out infected individuals ("migratory culling"). This symposium was convened in an effort to characterize more broadly the role that animal migrations play in the dynamics of infectious disease, by integrating a range of approaches and scales across host taxa. We began with questions related to within-host processes, focusing on the consequences of nutritional constraints and strenuous movement for individual immune capability, and of parasite infection for movement capacity. We then scaled-up to between-host processes to identify what types, distances, or patterns of host movements are associated with the spread of infectious agents. Finally, we discussed landscape-scale relationships between migration and infectious disease, and how these may be altered as a result of anthropogenic changes to climate and land use. We are just beginning to scratch the surface of the interactions between infection and animal migrations; yet, with so many migrations now under threat, there is an urgent need to develop a holistic understanding of the potential for migrations to both increase and reduce infection risk.
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Affiliation(s)
| | - Bethany J Hoye
- †School of Life & Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Victoria 3220, Australia
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35
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Johnson PTJ, Stanton DE, Forshay KJ, Calhoun DM. Vertically challenged: How disease suppresses Daphnia vertical migration behavior. LIMNOLOGY AND OCEANOGRAPHY 2017; 63:886-896. [PMID: 32704187 PMCID: PMC7377221 DOI: 10.1002/lno.10676] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Parasitic infections are increasingly recognized as influential forces in the migratory behaviors of hosts ranging from butterflies to whales. In aquatic zooplankton, diel vertical migrations (DVMs) are among the most recurrent behaviors with implications for predator-prey interactions, nutrient cycling, and energy flow, yet how parasitism affects such migrations remains an open question. Here, we tested the effects of sporangia cluster disease (SCD) on DVM of the large-bodied Daphnia pulicaria, which is often considered a key component of lake food webs. By collecting depth-specific zooplankton samples across diel cycles, between years, and among lakes, we show that infection is associated with strong inhibition of host DVM; while all Daphnia tended to occur deeper during the day, uninfected Daphnia and especially gravid individuals migrated to shallower waters at night. In contrast, infected hosts-which could comprise 40% of the population-were more likely to remain deep regardless of time of day. Among infected hosts, the intensity of SCD (sporangia count per host) predicted the degree of DVM inhibition. These observations-coupled with lab-based assays showing that infected hosts exhibited fewer swimming movements and persisted at lower depths than uninfected conspecifics-suggest that parasite-induced inhibition of DVM is a "sickness behavior" resulting from increasing morbidity and energy depletion as the infection intensifies toward host death. Considering the importance of large-bodied Daphnia as regulators of water clarity and prey for fishes, parasite-induced alterations of host migratory behavior have broad potential to affect the redistribution of energy and nutrients within lake ecosystems.
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Affiliation(s)
- Pieter T J Johnson
- Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado
| | - Daniel E Stanton
- Ecology, Evolution and Behavior, University of Minnesota, Minneapolis, Minnesota
| | - Kenneth J Forshay
- Groundwater and Ecosystem Restoration Division, U.S. Environmental Protection Agency, Ada, Oklahoma
| | - Dana M Calhoun
- Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado
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36
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Abstract
The extent of New Zealand's freshwater fish-parasite diversity has yet to be fully revealed, with host-parasite relationships still to be described from nearly half the known fish community. While advances in the number of fish species examined and parasite taxa described are being made, some parasite groups, such as nematodes, remain poorly understood. In the present study we combined morphological and molecular analyses to characterize a capillariid nematode found infecting the swim bladder of the brown mudfish Neochanna apoda, an endemic New Zealand fish from peat-swamp-forests. Morphologically, the studied nematodes are distinct from other Capillariinae taxa by the features of the male posterior end, namely the shape of the bursa lobes, and shape of spicule distal end. Male specimens were classified into three different types according to differences in the shape of the bursa lobes at the posterior end, but only one was successfully characterized molecularly. Molecular analysis indicated that the studied capillariid is distinct from other genera. However, inferences about the phylogenetic position of the capillariid reported here will remain uncertain, due to the limited number of Capillariinae taxa characterized molecularly. The discovery of this new capillariid, which atypically infects the swim bladder of its host, which itself inhabits a very unique ecosystem, underlines the very interesting evolutionary history of this parasite, which for now will remain unresolved.
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37
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38
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Clark NJ, Wells K, Dimitrov D, Clegg SM. Co-infections and environmental conditions drive the distributions of blood parasites in wild birds. J Anim Ecol 2016; 85:1461-1470. [DOI: 10.1111/1365-2656.12578] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 07/17/2016] [Indexed: 11/29/2022]
Affiliation(s)
- Nicholas J. Clark
- Environmental Futures Research Institute; School of Environment; Griffith University; Gold Coast Qld 4111 Australia
- Natural Environments Program; Queensland Museum; Institute of Biodiversity and Ecosystem Research; P.O. Box 3300 South Brisbane Qld 4101 Australia
| | - Konstans Wells
- Environmental Futures Research Institute; School of Environment; Griffith University; Gold Coast Qld 4111 Australia
| | - Dimitar Dimitrov
- Institute of Biodiversity and Ecosystem Research at the Bulgarian Academy of Sciences; 2 Gagarin Street Sofia 1113 Bulgaria
| | - Sonya M. Clegg
- Environmental Futures Research Institute; School of Environment; Griffith University; Gold Coast Qld 4111 Australia
- Department of Zoology; Edward Grey Institute of Field Ornithology; University of Oxford; Oxford OX1 3PS UK
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Satterfield DA, Villablanca FX, Maerz JC, Altizer S. Migratory monarchs wintering in California experience low infection risk compared to monarchs breeding year-round on non-native milkweed. Integr Comp Biol 2016; 56:343-52. [PMID: 27252207 DOI: 10.1093/icb/icw030] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Long-distance migration can lower infection risk for animal populations by removing infected individuals during strenuous journeys, spatially separating susceptible age classes, or allowing migrants to periodically escape from contaminated habitats. Many seasonal migrations are changing due to human activities including climate change and habitat alteration. Moreover, for some migratory populations, sedentary behaviors are becoming more common as migrants abandon or shorten their journeys in response to supplemental feeding or warming temperatures. Exploring the consequences of reduced movement for host-parasite interactions is needed to predict future responses of animal pathogens to anthropogenic change. Monarch butterflies (Danaus plexippus) and their specialist protozoan parasite Ophryocystis elektroscirrha (OE) provide a model system for examining how long-distance migration affects infectious disease processes in a rapidly changing world. Annual monarch migration from eastern North America to Mexico is known to reduce protozoan infection prevalence, and more recent work suggests that monarchs that forego migration to breed year-round on non-native milkweeds in the southeastern and south central Unites States face extremely high risk of infection. Here, we examined the prevalence of OE infection from 2013 to 2016 in western North America, and compared monarchs exhibiting migratory behavior (overwintering annually along the California coast) with those that exhibit year-round breeding. Data from field collections and a joint citizen science program of Monarch Health and Monarch Alert showed that infection frequency was over nine times higher for monarchs sampled in gardens with year-round milkweed as compared to migratory monarchs sampled at overwintering sites. Results here underscore the importance of animal migrations for lowering infection risk and motivate future studies of pathogen transmission in migratory species affected by environmental change.
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Affiliation(s)
| | - Francis X Villablanca
- Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA
| | - John C Maerz
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA 30602, USA
| | - Sonia Altizer
- *Odum School of Ecology, University of Georgia, Athens, GA 30602, USA
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40
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Shaw AK, Binning SA. Migratory Recovery from Infection as a Selective Pressure for the Evolution of Migration. Am Nat 2016; 187:491-501. [PMID: 27028077 DOI: 10.1086/685386] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Migration, a widespread animal behavior, can influence how individuals acquire and transmit pathogens. Past work has demonstrated that migration can reduce the costs of pathogen or parasite infection through two processes: migratory escape from infected areas or individuals and migratory culling of infected individuals. Here, we propose a third process: migratory recovery, where infected individuals lose their parasites and recover from infection during migration. Recovery can occur when parasites and/or their intermediate hosts cannot support changes in the migratory host's internal or external environment during migration. Thus, parasite mortality increases with migration. Although migratory recovery is likely widespread across species, it remains challenging to empirically test it as a selective force promoting migration. We develop a model and determine the conditions under which migratory recovery theoretically favors the evolution of migration. We show that incorporating migratory recovery into a model of migratory escape increases the range of biologically realistic conditions favoring migration and leads to scenarios where partial migration can evolve. Motivated by empirical estimates of infection costs, our model shows how recovery from infection could drive the evolution of migration. We suggest a number of future directions for both theoretical and empirical research in this area.
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41
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42
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Decreased movement related to parasite infection in a diel migratory coral reef fish. Behav Ecol Sociobiol 2015. [DOI: 10.1007/s00265-015-1956-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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43
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Koprivnikar J, Leung TLF. Flying with diverse passengers: greater richness of parasitic nematodes in migratory birds. OIKOS 2014. [DOI: 10.1111/oik.01799] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Janet Koprivnikar
- Dept of Chemistry and Biology; Ryerson Univ.; 350 Victoria Street Toronto, ON M5B 2K3 Canada
| | - Tommy L. F. Leung
- Centre for Behavioural and Physiological Ecology, Zoology, Univ. of New England; Armidale, New South Wales 2351 Australia
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