51
|
Connelly SJ, Stoeckel JA, Gitzen RA, Williamson CE, González MJ. Effect of Clonal Selection on Daphnia Tolerance to Dark Experimental Conditions. PLoS One 2016; 11:e0159628. [PMID: 27434210 PMCID: PMC4951146 DOI: 10.1371/journal.pone.0159628] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 07/06/2016] [Indexed: 11/18/2022] Open
Abstract
Recent studies have demonstrated substantial effects of environmental stress that vary among clones. Exposure to ultraviolet radiation (UV) is an important abiotic stressor that is highly variable in aquatic ecosystems due to diel and seasonal variations in incident sunlight as well as to differences in the UV transparency of water among water bodies, the depth distribution of organisms, and the ability of organisms to detect and respond to UV. In contrast to the convention that all UV is damaging, evidence is accumulating for the beneficial effects of exposure to low levels of UV radiation. Whereas UV has been frequently observed as the primary light-related stressor, herein we present evidence that dark conditions may be similarly “stressful” (reduction of overall fitness), and stress responses vary among clones of the freshwater crustacean Daphnia parvula. We have identified a significant relationship between survivorship and reduced fecundity of clones maintained in dark conditions, but no correlation between tolerance of the clones to dark and UV radiation. Low tolerance to dark conditions can have negative effects not only on accumulated stresses in organisms (e.g. the repair of UV-induced damage in organisms with photolyase), but potentially on the overall physiology and fitness of organisms. Our results support recent evidence of the beneficial effects of low-level UV exposure for some organisms.
Collapse
Affiliation(s)
- Sandra J. Connelly
- Thomas H. Gosnell School of Life Sciences, Rochester Institute of Technology, Rochester, NY 14623, United States of America
- * E-mail:
| | - James A. Stoeckel
- School of Fisheries, Aquaculture and Aquatic Sciences, College of Agriculture, Auburn University, Auburn, AL 36849, United States of America
- Department of Biology, Miami University, Oxford, OH 45056, United States of America
| | - Robert A. Gitzen
- School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, United States of America
| | - Craig E. Williamson
- Department of Biology, Miami University, Oxford, OH 45056, United States of America
| | - Maria J. González
- Department of Biology, Miami University, Oxford, OH 45056, United States of America
| |
Collapse
|
52
|
Calhoun DM, Woodhams D, Howard C, LaFonte BE, Gregory JR, Johnson PTJ. Role of Antimicrobial Peptides in Amphibian Defense Against Trematode Infection. ECOHEALTH 2016; 13:383-91. [PMID: 26911920 PMCID: PMC4996749 DOI: 10.1007/s10393-016-1102-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 01/11/2016] [Accepted: 01/13/2016] [Indexed: 05/18/2023]
Abstract
Antimicrobial peptides (AMPs) contribute to the immune defenses of many vertebrates, including amphibians. As larvae, amphibians are often exposed to the infectious stages of trematode parasites, many of which must penetrate the host's skin, potentially interacting with host AMPs. We tested the effects of the natural AMPs repertoires on both the survival of trematode infectious stages as well as their ability to infect larval amphibians. All five trematode species exhibited decreased survival of cercariae in response to higher concentrations of adult bullfrog AMPs, but no effect when exposed to AMPs from larval bullfrogs. Similarly, the use of norepinephrine to remove AMPs from larval bullfrogs, Pacific chorus frogs, and gray treefrogs had only weak (gray treefrogs) or non-significant (other tested species) effects on infection success by Ribeiroia ondatrae. We nonetheless observed strong differences in parasite infection as a function of both host stage (first- versus second-year bullfrogs) and host species (Pacific chorus frogs versus gray treefrogs) that were apparently unrelated to AMPs. Taken together, our results suggest that AMPs do not play a significant role in defending larval amphibians against trematode cercariae, but that they could be one mechanism helping to prevent infection of post-metamorphic amphibians, particularly for highly aquatic species.
Collapse
Affiliation(s)
- Dana M Calhoun
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Ramaley N122 CB334, Boulder, CO, 80309, USA.
| | - Doug Woodhams
- Department of Biology, University of Massachusetts Boston, 100 Morrissey Blvd., Boston, MA, 02125, USA
| | - Cierra Howard
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Ramaley N122 CB334, Boulder, CO, 80309, USA
| | - Bryan E LaFonte
- George Washington University Law School, George Washington University, 2000 H St NW, Washington, DC, 20052, USA
| | - Jacklyn R Gregory
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Ramaley N122 CB334, Boulder, CO, 80309, USA
| | - Pieter T J Johnson
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Ramaley N122 CB334, Boulder, CO, 80309, USA
| |
Collapse
|
53
|
Barber I, Berkhout BW, Ismail Z. Thermal Change and the Dynamics of Multi-Host Parasite Life Cycles in Aquatic Ecosystems. Integr Comp Biol 2016; 56:561-72. [PMID: 27252219 PMCID: PMC5035383 DOI: 10.1093/icb/icw025] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Altered thermal regimes associated with climate change are impacting significantly on the physical, chemical, and biological characteristics of the Earth's natural ecosystems, with important implications for the biology of aquatic organisms. As well as impacting the biology of individual species, changing thermal regimes have the capacity to mediate ecological interactions between species, and the potential for climate change to impact host-parasite interactions in aquatic ecosystems is now well recognized. Predicting what will happen to the prevalence and intensity of infection of parasites with multiple hosts in their life cycles is especially challenging because the addition of each additional host dramatically increases the potential permutations of response. In this short review, we provide an overview of the diverse routes by which altered thermal regimes can impact the dynamics of multi-host parasite life cycles in aquatic ecosystems. In addition, we examine how experimentally amenable host-parasite systems are being used to determine the consequences of changing environmental temperatures for these different types of mechanism. Our overarching aim is to examine the potential of changing thermal regimes to alter not only the biology of hosts and parasites, but also the biology of interactions between hosts and parasites. We also hope to illustrate the complexity that is likely to be involved in making predictions about the dynamics of infection by multi-host parasites in thermally challenged aquatic ecosystems.
Collapse
Affiliation(s)
- Iain Barber
- Department of Neuroscience, Psychology & Behaviour, College of Medicine, Biological Sciences and Psychology, University of Leicester, Leicester, LE1 7RH, UK
| | - Boris W Berkhout
- Department of Neuroscience, Psychology & Behaviour, College of Medicine, Biological Sciences and Psychology, University of Leicester, Leicester, LE1 7RH, UK
| | - Zalina Ismail
- Department of Neuroscience, Psychology & Behaviour, College of Medicine, Biological Sciences and Psychology, University of Leicester, Leicester, LE1 7RH, UK
| |
Collapse
|
54
|
Mignatti A, Boag B, Cattadori IM. Host immunity shapes the impact of climate changes on the dynamics of parasite infections. Proc Natl Acad Sci U S A 2016; 113:2970-5. [PMID: 26884194 PMCID: PMC4801268 DOI: 10.1073/pnas.1501193113] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Global climate change is predicted to alter the distribution and dynamics of soil-transmitted helminth infections, and yet host immunity can also influence the impact of warming on host-parasite interactions and mitigate the long-term effects. We used time-series data from two helminth species of a natural herbivore and investigated the contribution of climate change and immunity on the long-term and seasonal dynamics of infection. We provide evidence that climate warming increases the availability of infective stages of both helminth species and the proportional increase in the intensity of infection for the helminth not regulated by immunity. In contrast, there is no significant long-term positive trend in the intensity for the immune-controlled helminth, as immunity reduces the net outcome of climate on parasite dynamics. Even so, hosts experienced higher infections of this helminth at an earlier age during critical months in the warmer years. Immunity can alleviate the expected long-term effect of climate on parasite infections but can also shift the seasonal peak of infection toward the younger individuals.
Collapse
MESH Headings
- Aging/immunology
- Animal Distribution
- Animals
- Global Warming
- Helminthiasis, Animal/epidemiology
- Helminthiasis, Animal/immunology
- Helminthiasis, Animal/parasitology
- Helminthiasis, Animal/transmission
- Host-Parasite Interactions/immunology
- Humidity
- Intestinal Diseases, Parasitic/epidemiology
- Intestinal Diseases, Parasitic/immunology
- Intestinal Diseases, Parasitic/parasitology
- Intestinal Diseases, Parasitic/veterinary
- Intestine, Small/immunology
- Intestine, Small/parasitology
- Larva/physiology
- Life Cycle Stages
- Ovum/physiology
- Population Dynamics
- Rabbits/immunology
- Rabbits/parasitology
- Scotland/epidemiology
- Seasons
- Soil/parasitology
- Stomach/immunology
- Stomach/parasitology
- Stomach Diseases/epidemiology
- Stomach Diseases/immunology
- Stomach Diseases/parasitology
- Stomach Diseases/veterinary
- Temperature
- Trichostrongyloidea/growth & development
- Trichostrongyloidea/physiology
- Trichostrongyloidiasis/epidemiology
- Trichostrongyloidiasis/immunology
- Trichostrongyloidiasis/parasitology
- Trichostrongyloidiasis/transmission
- Trichostrongyloidiasis/veterinary
- Trichostrongylosis/epidemiology
- Trichostrongylosis/immunology
- Trichostrongylosis/parasitology
- Trichostrongylosis/transmission
- Trichostrongylosis/veterinary
- Trichostrongylus/growth & development
- Trichostrongylus/physiology
Collapse
Affiliation(s)
- Andrea Mignatti
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano, Italy; Center for Infectious Disease Dynamics and Department of Biology, The Pennsylvania State University, University Park, PA 16082
| | - Brian Boag
- The James Hutton Institute, DD2 5DA Invergowrie, United Kingdom
| | - Isabella M Cattadori
- Center for Infectious Disease Dynamics and Department of Biology, The Pennsylvania State University, University Park, PA 16082;
| |
Collapse
|
55
|
Asynchrony in host and parasite phenology may decrease disease risk in livestock under climate warming: Nematodirus battus in lambs as a case study. Parasitology 2015; 142:1306-17. [PMID: 26091257 DOI: 10.1017/s0031182015000633] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Mismatch in the phenology of trophically linked species as a result of climate warming has been shown to have far-reaching effects on animal communities, but implications for disease have so far received limited attention. This paper presents evidence suggestive of phenological asynchrony in a host-parasite system arising from climate change, with impacts on transmission. Diagnostic laboratory data on outbreaks of infection with the pathogenic nematode Nematodirus battus in sheep flocks in the UK were used to validate region-specific models of the effect of spring temperature on parasite transmission. The hatching of parasite eggs to produce infective larvae is driven by temperature, while the availability of susceptible hosts depends on lambing date, which is relatively insensitive to inter-annual variation in spring temperature. In southern areas and in warmer years, earlier emergence of infective larvae in spring was predicted, with decline through mortality before peak availability of susceptible lambs. Data confirmed model predictions, with fewer outbreaks recorded in those years and regions. Overlap between larval peaks and lamb availability was not reduced in northern areas, which experienced no decreases in the number of reported outbreaks. Results suggest that phenological asynchrony arising from climate warming may affect parasite transmission, with non-linear but predictable impacts on disease burden. Improved understanding of complex responses of host-parasite systems to climate change can contribute to effective adaptation of parasite control strategies.
Collapse
|
56
|
Hoiss B, Krauss J, Steffan-Dewenter I. Interactive effects of elevation, species richness and extreme climatic events on plant-pollinator networks. GLOBAL CHANGE BIOLOGY 2015; 21:4086-97. [PMID: 26332102 DOI: 10.1111/gcb.12968] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 04/28/2015] [Accepted: 04/29/2015] [Indexed: 05/09/2023]
Abstract
Plant-pollinator interactions are essential for the functioning of terrestrial ecosystems, but are increasingly affected by global change. The risks to such mutualistic interactions from increasing temperature and more frequent extreme climatic events such as drought or advanced snow melt are assumed to depend on network specialization, species richness, local climate and associated parameters such as the amplitude of extreme events. Even though elevational gradients provide valuable model systems for climate change and are accompanied by changes in species richness, responses of plant-pollinator networks to climatic extreme events under different environmental and biotic conditions are currently unknown. Here, we show that elevational climatic gradients, species richness and experimentally simulated extreme events interactively change the structure of mutualistic networks in alpine grasslands. We found that the degree of specialization in plant-pollinator networks (H2') decreased with elevation. Nonetheless, network specialization increased after advanced snow melt at high elevations, whereas changes in network specialization after drought were most pronounced at sites with low species richness. Thus, changes in network specialization after extreme climatic events depended on climatic context and were buffered by high species richness. In our experiment, only generalized plant-pollinator networks changed in their degree of specialization after climatic extreme events. This indicates that contrary to our assumptions, network generalization may not always foster stability of mutualistic interaction networks.
Collapse
Affiliation(s)
- Bernhard Hoiss
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Jochen Krauss
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Ingolf Steffan-Dewenter
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany
| |
Collapse
|
57
|
Pastok D, Hoare MJ, Ryder JJ, Boots M, Knell RJ, Atkinson D, Hurst GDD. The role of host phenology in determining the incidence of an insect sexually transmitted infection. OIKOS 2015. [DOI: 10.1111/oik.02478] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daria Pastok
- Inst. of Integrative Biology, Univ. of Liverpool; Crown Street Liverpool L69 7ZB UK
| | - Mary-Jo Hoare
- Inst. of Integrative Biology, Univ. of Liverpool; Crown Street Liverpool L69 7ZB UK
| | - Jon J. Ryder
- Inst. of Integrative Biology, Univ. of Liverpool; Crown Street Liverpool L69 7ZB UK
- Centre for Ecology and Conservation, Biosciences, College of Life and Environmental Sciences, Univ. of Exeter; TR10 9EZ UK
| | - Mike Boots
- Centre for Ecology and Conservation, Biosciences, College of Life and Environmental Sciences, Univ. of Exeter; TR10 9EZ UK
| | - Rob J. Knell
- School of Biological and Chemical Sciences, Queen Mary, Univ. of London; Mile End Road London E1 4NS UK
| | - David Atkinson
- Inst. of Integrative Biology, Univ. of Liverpool; Crown Street Liverpool L69 7ZB UK
| | - Gregory D. D. Hurst
- Inst. of Integrative Biology, Univ. of Liverpool; Crown Street Liverpool L69 7ZB UK
| |
Collapse
|
58
|
Martinez-Bakker M, Helm B. The influence of biological rhythms on host-parasite interactions. Trends Ecol Evol 2015; 30:314-26. [PMID: 25907430 DOI: 10.1016/j.tree.2015.03.012] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 02/22/2015] [Accepted: 03/12/2015] [Indexed: 01/09/2023]
Abstract
Biological rhythms, from circadian control of cellular processes to annual cycles in life history, are a main structural element of biology. Biological rhythms are considered adaptive because they enable organisms to partition activities to cope with, and take advantage of, predictable fluctuations in environmental conditions. A flourishing area of immunology is uncovering rhythms in the immune system of animals, including humans. Given the temporal structure of immunity, and rhythms in parasite activity and disease incidence, we propose that the intersection of chronobiology, disease ecology, and evolutionary biology holds the key to understanding host-parasite interactions. Here, we review host-parasite interactions while explicitly considering biological rhythms, and propose that rhythms: influence within-host infection dynamics and transmission between hosts, might account for diel and annual periodicity in host-parasite systems, and can lead to a host-parasite arms race in the temporal domain.
Collapse
Affiliation(s)
- Micaela Martinez-Bakker
- Department of Ecology & Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA.
| | - Barbara Helm
- Institute for Biodiversity, Animal Health, and Comparative Medicine, University of Glasgow, Glasgow, UK
| |
Collapse
|