1
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Ma L, Wu DY, Wang Y, Hall JM, Mi CR, Xie HX, Tao WJ, Hou C, Cheng KM, Zhang YP, Wang JC, Lu HL, Du WG, Sun BJ. Collective effects of rising average temperatures and heat events on oviparous embryos. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2024; 38:e14266. [PMID: 38578127 DOI: 10.1111/cobi.14266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 01/23/2024] [Accepted: 01/29/2024] [Indexed: 04/06/2024]
Abstract
Survival of the immobile embryo in response to rising temperature is important to determine a species' vulnerability to climate change. However, the collective effects of 2 key thermal characteristics associated with climate change (i.e., rising average temperature and acute heat events) on embryonic survival remain largely unexplored. We used empirical measurements and niche modeling to investigate how chronic and acute heat stress independently and collectively influence the embryonic survival of lizards across latitudes. We collected and bred lizards from 5 latitudes and incubated their eggs across a range of temperatures to quantify population-specific responses to chronic and acute heat stress. Using an embryonic development model parameterized with measured embryonic heat tolerances, we further identified a collective impact of embryonic chronic and acute heat tolerances on embryonic survival. We also incorporated embryonic chronic and acute heat tolerance in hybrid species distribution models to determine species' range shifts under climate change. Embryos' tolerance of chronic heat (T-chronic) remained consistent across latitudes, whereas their tolerance of acute heat (T-acute) was higher at high latitudes than at low latitudes. Tolerance of acute heat exerted a more pronounced influence than tolerance of chronic heat. In species distribution models, climate change led to the most significant habitat loss for each population and species in its low-latitude distribution. Consequently, habitat for populations across all latitudes will shift toward high latitudes. Our study also highlights the importance of considering embryonic survival under chronic and acute heat stresses to predict species' vulnerability to climate change.
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Affiliation(s)
- Liang Ma
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- School of Ecology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Dan-Yang Wu
- College of Life and Environmental Sciences, Minzu University of China, Beijing, China
| | - Yang Wang
- School of Biological Sciences, Hebei Normal University, Shijiazhuang, China
| | - Joshua M Hall
- Department of Biology, Tennessee Technological University, Cookeville, Tennessee, USA
| | - Chun-Rong Mi
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Hong-Xin Xie
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Wei-Jie Tao
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Chao Hou
- School of Science, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Kun-Ming Cheng
- Key Laboratory for Ecology of Tropical Islands, College of Life Sciences, Ministry of Education, Hainan Normal University, Haikou, China
| | - Yong-Pu Zhang
- College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Ji-Chao Wang
- Key Laboratory for Ecology of Tropical Islands, College of Life Sciences, Ministry of Education, Hainan Normal University, Haikou, China
| | - Hong-Liang Lu
- Hangzhou Key Laboratory of Animal Adaptation and Evolution, Hangzhou Normal University, Hangzhou, China
| | - Wei-Guo Du
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Bao-Jun Sun
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
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2
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Jreidini N, Green DM. Study methodology impacts density-dependent dispersal observations: a systematic review. MOVEMENT ECOLOGY 2024; 12:39. [PMID: 38773669 PMCID: PMC11107046 DOI: 10.1186/s40462-024-00478-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 05/08/2024] [Indexed: 05/24/2024]
Abstract
The relationship between animal dispersal and conspecific density has been explored in various study systems but results in terms of both the magnitude and the direction of density dependence are inconsistent. We conducted a thorough review of the literature (2000-2023) and found k = 97 empirical studies of birds, fishes, herpetofauna (amphibians and reptiles), invertebrates, or mammals that had tested for a correlation between conspecific density and animal dispersal. We extracted categorical variables for taxonomic group, sex, age, migratory behavior, study design, dispersal metric, density metric and variable type, as well as temporal and spatial scale, to test each of their correlation with the effect of density on dispersal (Pearson's r) using linear regressions and multilevel mixed-effect modelling. We found certain biases in the published literature, highlighting that the impact of conspecific density on dispersal is not as widespread as it is thought to be. We also found no predominant trend for density-dependent dispersal across taxonomic groups. Instead, results show that the scale and metrics of empirical observations significantly affected analytical results, and heterogeneity measures were high within taxonomic groups. Therefore, the direction and magnitude of the interaction between density and dispersal in empirical studies could partially be attributed to the data collection method involved. We suggest that the contradictory observations for density-dependent dispersal could be explained by dispersal-dependent density, where density is driven by movement instead, and urge researchers to either test this interaction when applicable or consider this perspective when reporting results.
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Affiliation(s)
| | - David M Green
- Redpath Museum, McGill University, Montreal, QC, Canada
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3
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Acevedo MA, Fankhauser C, González L, Quigg M, Gonzalez B, Papa R. Recolonization of secondary forests by a locally extinct Caribbean anole through the lens of range expansion theory. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2024; 34:e2960. [PMID: 38425089 DOI: 10.1002/eap.2960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 01/10/2024] [Indexed: 03/02/2024]
Abstract
Disturbance and recovery dynamics are characteristic features of many ecosystems. Disturbance dynamics are widely studied in ecology and conservation biology. Still, we know less about the ecological processes that drive ecosystem recovery. The ecological processes that mediate ecosystem recovery stand at the intersection of many theoretical frameworks. Range expansion theory is one of these complementary frameworks that can provide unique insights into the population-level processes that mediate ecosystem recovery, particularly fauna recolonization. Although the biodiversity patterns that follow the fauna recolonization of recovering forests have been well described in the literature, the ecological processes at the population level that drive these patterns remain conspicuously unknown. In this study, we tested three fundamental predictions of range expansion theory during the recolonization of recovering forests in Puerto Rico by a shade specialist anole, Anolis gundlachi. Range expansion theory predicts that individuals at the early stages of recolonization (i.e., younger forests) would have a high prevalence of dispersive traits, experience less density dependence, and suffer less parasitism. To test these predictions, we conducted a chronosequence study applying space-for-time substitution where we compared phenotypic traits (i.e., body size, body condition, and relative limb size), population density, population growth rates, and Plasmodium parasitism rates among lizard populations living in young (<30 years), mid (~40-70 years), and old-growth forests (>75 years). Lizard populations in younger forests had lower densities, higher population growth rates, and lower rates of Plasmodium parasitism compared with old-growth forests. Still, while we found that individuals had larger body sizes, and longer forelimbs in young forests in one site, this result was not consistent among sites. This suggests a potential trade-off between the traits that provide a dispersal advantage during the initial stages of recolonization and those that are advantageous to establish in novel environmental conditions. Overall, our study emphasizes the suitability of range expansion theory to describe fauna recolonization but also highlights that the ecological processes that drive recolonization are time-dependent, complex, and nuanced.
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Affiliation(s)
- Miguel A Acevedo
- Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, Florida, USA
| | - Carly Fankhauser
- Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, Florida, USA
| | - Luis González
- Department of Biology, University of Puerto Rico-Mayagüez, Mayagüez, Puerto Rico
| | - Marné Quigg
- Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, Florida, USA
| | - Bella Gonzalez
- Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, Florida, USA
| | - Riccardo Papa
- Department of Biology, University of Puerto Rico-Río Piedras, San Juan, Puerto Rico
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4
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Jiang ZW, Ma L, Mi CR, Tao SA, Guo F, Du WG. Distinct responses and range shifts of lizard populations across an elevational gradient under climate change. GLOBAL CHANGE BIOLOGY 2023; 29:2669-2680. [PMID: 36843496 DOI: 10.1111/gcb.16656] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 02/22/2023] [Indexed: 05/31/2023]
Abstract
Ongoing climate change has profoundly affected global biodiversity, but its impacts on populations across elevations remain understudied. Using mechanistic niche models incorporating species traits, we predicted ecophysiological responses (activity times, oxygen consumption and evaporative water loss) for lizard populations at high-elevation (<3600 m asl) and extra-high-elevation (≥3600 m asl) under recent (1970-2000) and future (2081-2100) climates. Compared with their high-elevation counterparts, lizards from extra-high-elevation are predicted to experience a greater increase in activity time and oxygen consumption. By integrating these ecophysiological responses into hybrid species distribution models (HSDMs), we were able to make the following predictions under two warming scenarios (SSP1-2.6, SSP5-8.5). By 2081-2100, we predict that lizards at both high- and extra-high-elevation will shift upslope; lizards at extra-high-elevation will gain more and lose less habitat than will their high-elevation congeners. We therefore advocate the conservation of high-elevation species in the context of climate change, especially for those populations living close to their lower elevational range limits. In addition, by comparing the results from HSDMs and traditional species distribution models, we highlight the importance of considering intraspecific variation and local adaptation in physiological traits along elevational gradients when forecasting species' future distributions under climate change.
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Affiliation(s)
- Zhong-Wen Jiang
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Liang Ma
- School of Ecology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, People's Republic of China
| | - Chun-Rong Mi
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Shi-Ang Tao
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Fengyi Guo
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA
| | - Wei-Guo Du
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, People's Republic of China
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5
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Jreidini N, Green DM. Dispersal without drivers: Intrinsic and extrinsic variables have no impact on movement distances in a terrestrial amphibian. Ecol Evol 2022; 12:e9368. [PMID: 36203625 PMCID: PMC9526034 DOI: 10.1002/ece3.9368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 09/09/2022] [Accepted: 09/12/2022] [Indexed: 11/07/2022] Open
Abstract
Dispersive movements are often thought to be multicausal and driven by individual body size, sex, conspecific density, environmental variation, personality, and/or other variables. Yet such variables often do not account for most of the variation among dispersive movements in nature, leaving open the possibility that dispersion may be indeterministic. We assessed the amount of variation in 24 h movement distances that could be accounted for by potential drivers of displacement with a large empirical dataset of movement distances performed by Fowler's Toads (Anaxyrus fowleri) on the northern shore of Lake Erie at Long Point, Ontario (2002-2021, incl.). These toads are easy to sample repeatedly, can be identified individually and move parallel to the shoreline as they forage at night, potentially dispersing to new refuge sites. Using a linear mixed-effect model that incorporated random effect terms to account for sampling variance and inter-annual variation, we found that all potential intrinsic and extrinsic drivers of movement accounted for virtually none of the variation observed among 24 h distances moved by these animals, whether over short or large spatial scales. We examined the idea of movement personality by testing variance per individual toad and found no evidence of individuality in movement distances. We conclude that deterministic variables, whether intrinsic or extrinsic, neither can be shown to nor are necessary to drive movements in this population over all spatial scales. Stochastic, short time-scale movements, such as daily foraging movements, can instead accumulate over time to produce large spatial-scale movements that are dispersive in nature.
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6
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Fargevieille A, Reedy AM, Kahrl AF, Mitchell TS, Durso AM, Delaney DM, Pearson PR, Cox RM, Warner DA. Propagule size and sex ratio influence colonisation dynamics after introduction of a non-native lizard. J Anim Ecol 2022; 91:845-857. [PMID: 35114034 DOI: 10.1111/1365-2656.13671] [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: 10/15/2021] [Accepted: 01/23/2022] [Indexed: 11/28/2022]
Abstract
The composition of founding populations plays an important role in colonisation dynamics and can influence population growth during early stages of biological invasion. Specifically, founding populations with small propagules (i.e., low number of founders) are vulnerable to the Allee effect and have reduced likelihood of establishment compared to those with large propagules. The founding sex ratio can also impact establishment via its influence on mating success and offspring production. Our goal was to test the effects of propagule size and sex ratio on offspring production and annual population growth following introductions of a non-native lizard species (Anolis sagrei). We manipulated propagule composition on nine small islands, then examined offspring production, population growth, and survival rate of founders and their descendants encompassing three generations. By the third reproductive season, per capita offspring production was higher on islands seeded with a relatively large propagule size, but population growth was not associated with propagule size. Propagule sex ratio did not affect offspring production, but populations with a female-biased propagule had positive growth, whereas those with a male-biased propagule had negative growth in the first year. Populations were not affected by propagule sex ratio in subsequent years, possibly due to rapid shifts towards balanced (or slightly female-biased) population sex ratios. Overall, we show that different components of population fitness have different responses to propagule size and sex ratio in ways that could affect early stages of biological invasion. Despite these effects, the short lifespan and high fecundity of A. sagrei likely helped small populations to overcome Allee effects and enabled all populations to successfully establish. Our rare experimental manipulation of propagule size and sex ratio can inform predictions of colonisation dynamics in response to different compositions of founding populations, which is critical in the context of population ecology and invasion dynamics.
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Affiliation(s)
- Amélie Fargevieille
- Department of Biological Sciences, Auburn University, Auburn, AL, 36849, USA.,Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - Aaron M Reedy
- Department of Biological Sciences, Auburn University, Auburn, AL, 36849, USA.,Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA
| | - Ariel F Kahrl
- Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA.,Department of Zoology/Ethology, Stockholm University, Svante Arrhenius väg, 18B SE-10691, Stockholm, Sweden
| | - Timothy S Mitchell
- Department of Biological Sciences, Auburn University, Auburn, AL, 36849, USA.,Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA, 50011, USA.,Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Andrew M Durso
- Department of Biological Sciences, Florida Gulf Coast University, Fort Myers, FL, 33965, USA
| | - David M Delaney
- Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA, 50011, USA.,Department of Biology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA.,Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, Colorado, 80302, USA
| | - Phillip R Pearson
- Department of Biological Sciences, Auburn University, Auburn, AL, 36849, USA.,Department of Biology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA.,Centre for Conservation, Ecology and Genomics, University of Canberra, Bruce, ACT, 2617, Australia
| | - Robert M Cox
- Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA
| | - Daniel A Warner
- Department of Biological Sciences, Auburn University, Auburn, AL, 36849, USA.,Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA, 50011, USA.,Department of Biology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
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7
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Sun B, Ma L, Wang Y, Mi C, Buckley LB, Levy O, Lu H, Du W. Latitudinal embryonic thermal tolerance and plasticity shape the vulnerability of oviparous species to climate change. ECOL MONOGR 2021. [DOI: 10.1002/ecm.1468] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bao‐jun Sun
- Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 China
| | - Liang Ma
- Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 China
| | - Yang Wang
- School of Biological Sciences Hebei Normal University Shijiazhuang China
| | - Chun‐rong Mi
- Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 China
| | - Lauren B. Buckley
- Department of Biology University of Washington Seattle Washington USA
| | - Ofir Levy
- School of Zoology Tel Aviv University Tel Aviv 6997801 Israel
| | - Hong‐liang Lu
- Hangzhou Key Laboratory for Animal Adaptation and Evolution School of Life and Environmental Sciences Hangzhou Normal University Hangzhou Zhejiang 310036 China
| | - Wei‐Guo Du
- Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 China
- Center for Excellence in Animal Evolution and Genetics Chinese Academy of Sciences Kunming 650223 China
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8
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Weber WD, Anthony NM, Lailvaux SP. Size but not relatedness drives the spatial distribution of males within an urban population of Anolis carolinensis lizards. Ecol Evol 2021; 11:2886-2898. [PMID: 33767844 PMCID: PMC7981233 DOI: 10.1002/ece3.7248] [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] [Received: 10/10/2020] [Revised: 01/05/2021] [Accepted: 01/08/2021] [Indexed: 11/10/2022] Open
Abstract
The way that individuals are spatially organized in their environment is a fundamental population characteristic affecting social structure, mating system, and reproductive ecology. However, for many small or cryptic species, the factors driving the spatial distribution of individuals within a population are poorly understood and difficult to quantify. We combined microsatellite data, remote sensing, and mark-recapture techniques to test the relative importance of body size and relatedness in determining the spatial distribution of male Anolis carolinensis individuals within a focal population over a five-year period. We found that males maintain smaller home ranges than females. We found no relationship between male body size and home range size, nor any substantial impact of relatedness on the geographic proximity. Instead, the main driver of male spatial distribution in this population was differences in body size. We also found no evidence for offspring inheritance of their parent's territories. Males were never sampled within their father's territory providing strong support for male-biased dispersal. This study introduces a novel approach by combining standard mark release capture data with measures of pairwise relatedness, body size, and GPS locations to better understand the factors that drive the spatial distribution of individuals within a population.
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Affiliation(s)
- William David Weber
- Department of Biological SciencesUniversity of NewOrleans, New OrleansLAUSA
- Department of BiologyUniversity of MarylandCollege ParkMDUSA
| | - Nicola M. Anthony
- Department of Biological SciencesUniversity of NewOrleans, New OrleansLAUSA
| | - Simon P. Lailvaux
- Department of Biological SciencesUniversity of NewOrleans, New OrleansLAUSA
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9
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Logan ML, Neel LK, Nicholson DJ, Stokes AJ, Miller CL, Chung AK, Curlis JD, Keegan KM, Rosso AA, Maayan I, Folfas E, Williams CE, Casement B, Gallegos Koyner MA, Padilla Perez DJ, Falvey CH, Alexander SM, Charles KL, Graham ZA, McMillan WO, Losos JB, Cox CL. Sex-specific microhabitat use is associated with sex-biased thermal physiology in Anolis lizards. J Exp Biol 2021; 224:jeb235697. [PMID: 33328289 DOI: 10.1242/jeb.235697] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 12/07/2020] [Indexed: 08/25/2023]
Abstract
If fitness optima for a given trait differ between males and females in a population, sexual dimorphism may evolve. Sex-biased trait variation may affect patterns of habitat use, and if the microhabitats used by each sex have dissimilar microclimates, this can drive sex-specific selection on thermal physiology. Nevertheless, tests of differences between the sexes in thermal physiology are uncommon, and studies linking these differences to microhabitat use or behavior are even rarer. We examined microhabitat use and thermal physiology in two ectothermic congeners that are ecologically similar but differ in their degree of sexual size dimorphism. Brown anoles (Anolis sagrei) exhibit male-biased sexual size dimorphism and live in thermally heterogeneous habitats, whereas slender anoles (Anolis apletophallus) are sexually monomorphic in body size and live in thermally homogeneous habitats. We hypothesized that differences in habitat use between the sexes would drive sexual divergence in thermal physiology in brown anoles, but not slender anoles, because male and female brown anoles may be exposed to divergent microclimates. We found that male and female brown anoles, but not slender anoles, used perches with different thermal characteristics and were sexually dimorphic in thermal tolerance traits. However, field-active body temperatures and behavior in a laboratory thermal arena did not differ between females and males in either species. Our results suggest that sexual dimorphism in thermal physiology can arise from phenotypic plasticity or sex-specific selection on traits that are linked to thermal tolerance, rather than from direct effects of thermal environments experienced by males and females.
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Affiliation(s)
- Michael L Logan
- Department of Biology, University of Nevada, Reno, NV 89557, USA
- Smithsonian Tropical Research Institute, Panamá City, Panamá
| | - Lauren K Neel
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - Daniel J Nicholson
- School of Biological and Chemical Sciences, Queen Mary University, London, E1 4NS, UK
- Zoological Society of London, London, NW1 4RY, UK
| | - Andrew J Stokes
- Department of Environmental Studies, University of Illinois Springfield, Springfield, IL 62703, USA
| | - Christina L Miller
- Department of Biological Sciences, University of Queensland, Queensland, Australia
| | - Albert K Chung
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA 90095, USA
- Department of Biology, Georgia Southern University, Statesboro, GA 30460, USA
| | - John David Curlis
- Department of Biology, Georgia Southern University, Statesboro, GA 30460, USA
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kaitlin M Keegan
- Department of Geological Sciences and Engineering, University of Nevada, Reno, NV 89557, USA
| | - Adam A Rosso
- Department of Biology, Georgia Southern University, Statesboro, GA 30460, USA
| | - Inbar Maayan
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
| | - Edite Folfas
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada, M5S 3B2
| | - Claire E Williams
- Department of Biology, Northeastern University, Boston, MA 02115, USA
| | - Brianna Casement
- Department of Biology and Environmental Science, Heidelberg University, Tiffin, OH 44883, USA
| | - Maria A Gallegos Koyner
- Department of Forest Sciences, University of British Columbia, Vancouver, BC, Canada, V6T 1Z4
| | | | - Cleo H Falvey
- Department of Biology, University of Massachusetts, Boston, MA 02125, USA
| | - Sean M Alexander
- Departement of Biology, Rutgers University, Camden, NJ 08901, USA
| | | | - Zackary A Graham
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - W Owen McMillan
- Smithsonian Tropical Research Institute, Panamá City, Panamá
| | - Jonathan B Losos
- Department of Biology, Washington University, Saint Louis, MO 63130, USA
| | - Christian L Cox
- Department of Biological Sciences and Institute for the Environment, Florida International University, FL 33199, USA
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10
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Dependence on a human structure influences the extinction of a non-native lizard population after a major environmental change. Biol Invasions 2020. [DOI: 10.1007/s10530-020-02405-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Kustra MC, Kahrl AF, Reedy AM, Warner DA, Cox RM. Sperm morphology and count vary with fine-scale changes in local density in a wild lizard population. Oecologia 2019; 191:555-564. [PMID: 31624957 PMCID: PMC6825022 DOI: 10.1007/s00442-019-04511-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 09/10/2019] [Indexed: 10/30/2022]
Abstract
Given that sperm production can be costly, theory predicts that males should optimally adjust the quantity and/or quality of their sperm in response to their social environment to maximize their paternity success. Although experiments demonstrate that males can alter their ejaculates in response to manipulations of the social environment and studies show that ejaculate traits covary with social environment across populations, it is unknown whether individual variation in sperm traits corresponds to natural variation found within wild populations. Using an island population of brown anole lizards (Anolis sagrei), we tested the prediction that sperm traits (sperm count, sperm morphology, sperm velocity) respond to natural variation in the risk of sperm competition, as inferred from the local density and operational sex ratio (OSR) of conspecifics. We found that males living in high-density areas of the island produced relatively larger sperm midpieces, smaller sperm heads, and lower sperm counts. Sperm traits were unrelated to OSR after accounting for the covariance between OSR and density. Our findings broaden the implications of sperm competition theory to intrapopulation social environment variation by showing that sperm count and sperm morphology vary with fine-scale differences in density within a single wild population.
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Affiliation(s)
- Matthew C Kustra
- Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA.,Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, 95064, USA
| | - Ariel F Kahrl
- Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA. .,Stockholm University, Zoologiska institutionen: Etologi, 106 91, Stockholm, Sweden.
| | - Aaron M Reedy
- Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA.,Department of Biological Sciences, Auburn University, Auburn, AL, 36849, USA
| | - Daniel A Warner
- Department of Biological Sciences, Auburn University, Auburn, AL, 36849, USA
| | - Robert M Cox
- Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA
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12
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Bourgeois Y, Boissinot S. Selection at behavioural, developmental and metabolic genes is associated with the northward expansion of a successful tropical colonizer. Mol Ecol 2019; 28:3523-3543. [PMID: 31233650 DOI: 10.1111/mec.15162] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 05/28/2019] [Indexed: 02/06/2023]
Abstract
What makes a species able to colonize novel environments? This question is key to understand the dynamics of adaptive radiations and ecological niche shifts, but the mechanisms that underlie expansion into novel habitats remain poorly understood at a genomic scale. Lizards from the genus Anolis are typically tropical, and the green anole (Anolis carolinensis) constitutes an exception since it expanded into temperate North America from subtropical Florida. Thus, we used the green anole as a model to investigate signatures of selection associated with colonization of a new environment, namely temperate North America. To this end, we analysed 29 whole-genome sequences, covering the entire native range of the species. We used a combination of recent methods to quantify both positive and balancing selection in northern populations, including FST outlier methods, machine learning and ancestral recombination graphs. We naively scanned for genes of interest and assessed the overlap between multiple tests. Strikingly, we identified many genes involved in behaviour, suggesting that the recent successful colonization of northern environments may have been linked to behavioural shifts as well as physiological adaptation. Using a candidate genes strategy, we determined that genes involved in response to cold or behaviour displayed more frequently signals of selection, while controlling for local recombination rate, gene clustering and gene length. In addition, we found signatures of balancing selection at immune genes in all investigated genetic groups, but also at genes involved in neuronal and anatomical development.
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Affiliation(s)
- Yann Bourgeois
- New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
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13
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Asymmetric interference competition and niche partitioning between native and invasive Anolis lizards. Oecologia 2019; 190:811-820. [DOI: 10.1007/s00442-019-04466-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 07/08/2019] [Indexed: 01/14/2023]
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14
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Bourgeois Y, Ruggiero RP, Manthey JD, Boissinot S. Recent Secondary Contacts, Linked Selection, and Variable Recombination Rates Shape Genomic Diversity in the Model Species Anolis carolinensis. Genome Biol Evol 2019; 11:2009-2022. [PMID: 31134281 PMCID: PMC6681179 DOI: 10.1093/gbe/evz110] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/23/2019] [Indexed: 12/14/2022] Open
Abstract
Gaining a better understanding on how selection and neutral processes affect genomic diversity is essential to gain better insights into the mechanisms driving adaptation and speciation. However, the evolutionary processes affecting variation at a genomic scale have not been investigated in most vertebrate lineages. Here, we present the first population genomics survey using whole genome resequencing in the green anole (Anolis carolinensis). Anoles have been intensively studied to understand mechanisms underlying adaptation and speciation. The green anole in particular is an important model to study genome evolution. We quantified how demography, recombination, and selection have led to the current genetic diversity of the green anole by using whole-genome resequencing of five genetic clusters covering the entire species range. The differentiation of green anole's populations is consistent with a northward expansion from South Florida followed by genetic isolation and subsequent gene flow among adjacent genetic clusters. Dispersal out-of-Florida was accompanied by a drastic population bottleneck followed by a rapid population expansion. This event was accompanied by male-biased dispersal and/or selective sweeps on the X chromosome. We show that the interaction between linked selection and recombination is the main contributor to the genomic landscape of differentiation in the anole genome.
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Affiliation(s)
| | | | - Joseph D Manthey
- New York University Abu Dhabi, United Arab Emirates
- Department of Biological Sciences, Texas Tech University
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15
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Folt B, Bauder J, Spear S, Stevenson D, Hoffman M, Oaks JR, Wood PL, Jenkins C, Steen DA, Guyer C. Taxonomic and conservation implications of population genetic admixture, mito-nuclear discordance, and male-biased dispersal of a large endangered snake, Drymarchon couperi. PLoS One 2019; 14:e0214439. [PMID: 30913266 PMCID: PMC6435180 DOI: 10.1371/journal.pone.0214439] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 03/11/2019] [Indexed: 01/08/2023] Open
Abstract
Accurate species delimitation and description are necessary to guide effective conservation of imperiled species, and this synergy is maximized when multiple data sources are used to delimit species. We illustrate this point by examining Drymarchon couperi (Eastern Indigo Snake), a large, federally-protected species in North America that was recently divided into two species based on gene sequence data from three loci and heuristic morphological assessment. Here, we re-evaluate the two-species hypothesis for D. couperi by evaluating both population genetic and gene sequence data. Our analyses of 14 microsatellite markers revealed 6–8 genetic population clusters with significant admixture, particularly across the contact zone between the two hypothesized species. Phylogenetic analyses of gene sequence data with maximum-likelihood methods suggested discordance between mitochondrial and nuclear markers and provided phylogenetic support for one species rather than two. For these reasons, we place Drymarchon kolpobasileus into synonymy with D. couperi. We suggest inconsistent patterns between mitochondrial and nuclear DNA are driven by high dispersal of males relative to females. We advocate for species delimitation exercises that evaluate admixture and gene flow in addition to phylogenetic analyses, particularly when the latter reveal monophyletic lineages. This is particularly important for taxa, such as squamates, that exhibit strong sex-biased dispersal. Problems associated with over-delimitation of species richness can become particularly acute for threatened and endangered species, because of high costs to conservation when taxonomy demands protection of more individual species than are supported by accumulating data.
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Affiliation(s)
- Brian Folt
- Department of Biological Sciences and Auburn University Museum of Natural History, Auburn University, Auburn, Alabama, United States of America
- * E-mail:
| | - Javan Bauder
- The Orianne Society, 11 Fruitstand Lane, Tiger, Georgia, United States of America
- Department of Environmental Conservation, University of Massachusetts, Amherst, Massachusetts, United States of America
- Illinois Natural History Survey, University of Illinois, Champaign, Illinois, United States of America
| | - Stephen Spear
- The Orianne Society, 11 Fruitstand Lane, Tiger, Georgia, United States of America
- The Wilds, Cumberland, Ohio United States of America
| | - Dirk Stevenson
- The Orianne Society, 11 Fruitstand Lane, Tiger, Georgia, United States of America
- Altamaha Environmental Consulting, Hinesville, Georgia, United States of America
| | - Michelle Hoffman
- The Orianne Center for Indigo Conservation, Central Florida Zoo and Botanical Gardens, Sanford, Florida, United States of America
| | - Jamie R. Oaks
- Department of Biological Sciences and Auburn University Museum of Natural History, Auburn University, Auburn, Alabama, United States of America
| | - Perry L. Wood
- Department of Biological Sciences and Auburn University Museum of Natural History, Auburn University, Auburn, Alabama, United States of America
| | - Christopher Jenkins
- The Orianne Society, 11 Fruitstand Lane, Tiger, Georgia, United States of America
| | - David A. Steen
- Georgia Sea Turtle Center, Jekyll Island Authority, Jekyll Island, Georgia, United States of America
| | - Craig Guyer
- Department of Biological Sciences and Auburn University Museum of Natural History, Auburn University, Auburn, Alabama, United States of America
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16
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Kamath A, Losos JB. Estimating encounter rates as the first step of sexual selection in the lizard Anolis sagrei. Proc Biol Sci 2019; 285:rspb.2017.2244. [PMID: 29467261 DOI: 10.1098/rspb.2017.2244] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/29/2018] [Indexed: 11/12/2022] Open
Abstract
How individuals move through their environment dictates which other individuals they encounter, determining their social and reproductive interactions and the extent to which they experience sexual selection. Specifically, females rarely have the option of mating with all males in a population-they can only choose among the males they encounter. Further, quantifying phenotypic differences between the males that females encounter and those that sire females' offspring lends insight into how social and reproductive interactions shape male phenotypes. We used an explicitly spatio-temporal Markov chain model to estimate the number of potential mates of Anolis sagrei lizards from their movement behaviour, and used genetic paternity assignments to quantify sexual selection on males. Females frequently encountered and mated with multiple males, offering ample opportunity for female mate choice. Sexual selection favoured males that were bigger and moved over larger areas, though the effect of body size cannot be disentangled from last-male precedence. Our approach corroborates some patterns of sexual selection previously hypothesized in anoles based on describing them as territorial, whereas other results, including female multiple mating itself, are at odds with territorial polygyny, offering insight into discrepancies in other taxa between behavioural and genetic descriptions of mating systems.
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Affiliation(s)
- Ambika Kamath
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
| | - Jonathan B Losos
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
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17
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Cole R, Viney M. The population genetics of parasitic nematodes of wild animals. Parasit Vectors 2018; 11:590. [PMID: 30424774 PMCID: PMC6234597 DOI: 10.1186/s13071-018-3137-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 10/08/2018] [Indexed: 12/17/2022] Open
Abstract
Parasitic nematodes are highly diverse and common, infecting virtually all animal species, and the importance of their roles in natural ecosystems is increasingly becoming apparent. How genes flow within and among populations of these parasites - their population genetics - has profound implications for the epidemiology of host infection and disease, and for the response of parasite populations to selection pressures. The population genetics of nematode parasites of wild animals may have consequences for host conservation, or influence the risk of zoonotic disease. Host movement has long been recognised as an important determinant of parasitic nematode population genetic structure, and recent research has also highlighted the importance of nematode life histories, environmental conditions, and other aspects of host ecology. Commonly, factors influencing parasitic nematode population genetics have been studied in isolation, such that an integrated view of the drivers of population genetic structure of parasitic nematodes is still lacking. Here, we seek to provide a comprehensive, broad, and integrative picture of these factors in parasitic nematodes of wild animals that will be a useful resource for investigators studying non-model parasitic nematodes in natural ecosystems. Increasingly, new methods of analysing the population genetics of nematodes are becoming available, and we consider the opportunities that these afford in resolving hitherto inaccessible questions of the population genetics of these important animals.
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Affiliation(s)
- Rebecca Cole
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK.
| | - Mark Viney
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK
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18
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Jesse WAM, Behm JE, Helmus MR, Ellers J. Human land use promotes the abundance and diversity of exotic species on Caribbean islands. GLOBAL CHANGE BIOLOGY 2018; 24:4784-4796. [PMID: 29851186 DOI: 10.1111/gcb.14334] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 03/19/2018] [Accepted: 05/07/2018] [Indexed: 05/16/2023]
Abstract
Human land use causes major changes in species abundance and composition, yet native and exotic species can exhibit different responses to land use change. Native populations generally decline in human-impacted habitats while exotic species often benefit. In this study, we assessed the effects of human land use on exotic and native reptile diversity, including functional diversity, which relates to the range of habitat use strategies in biotic communities. We surveyed 114 reptile communities from localities that varied in habitat structure and human impact level on two Caribbean islands, and calculated species richness, overall abundance, and evenness for every plot. Functional diversity indices were calculated using published trait data, which enabled us to detect signs of trait filtering associated with impacted habitats. Our results show that environmental variation among sampling plots was explained by two Principal Component Analysis (PCA) ordination axes related to habitat structure (i.e., forest or nonforest) and human impact level (i.e., addition of man-made constructions such as roads and buildings). Several diversity indices were significantly correlated with the two PCA axes, but exotic and native species showed opposing responses. Native species reached the highest abundance in forests, while exotic species were absent in this habitat. Human impact was associated with an increase in exotic abundance and species richness, while native species showed no significant associations. Functional diversity was highest in nonforested environments on both islands, and further increased on St. Martin with the establishment of functionally unique exotic species in nonforested habitat. Habitat structure, rather than human impact, proved to be an important agent for environmental filtering of traits, causing divergent functional trait values across forested and nonforested environments. Our results illustrate the importance of considering various elements of land use when studying its impact on species diversity and the establishment and spread of exotic species.
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Affiliation(s)
- Wendy A M Jesse
- Department of Ecological Science - Animal Ecology, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Jocelyn E Behm
- Department of Ecological Science - Animal Ecology, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
- Integrative Ecology Lab, Center for Biodiversity, Department of Biology, Temple University, Philadelphia, Pennsylvania
| | - Matthew R Helmus
- Integrative Ecology Lab, Center for Biodiversity, Department of Biology, Temple University, Philadelphia, Pennsylvania
| | - Jacintha Ellers
- Department of Ecological Science - Animal Ecology, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
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19
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20
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Effects of age- and sex-specific density on behaviour and survival in a territorial lizard (Anolis sagrei). Anim Behav 2017. [DOI: 10.1016/j.anbehav.2017.04.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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22
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Gifford ME, Robinson CD, Clay TA. The Influence of Incubation Conditions and Sex on Growth and Dispersal in Hatchling Lizards. Ethology 2017. [DOI: 10.1111/eth.12595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Timothy A. Clay
- Department of Biological Science; University of Tulsa; Tulsa OK USA
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23
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Delaney DM, Warner DA. Adult Male Density Influences Juvenile Microhabitat Use in a Territorial Lizard. Ethology 2017. [DOI: 10.1111/eth.12586] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- David M. Delaney
- Department of Biology; University of Alabama at Birmingham; Birmingham AL USA
| | - Daniel A. Warner
- Department of Biology; University of Alabama at Birmingham; Birmingham AL USA
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24
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Moore MP, Whiteman HH. Natal philopatry varies with larval condition in salamanders. Behav Ecol Sociobiol 2016. [DOI: 10.1007/s00265-016-2133-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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25
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Age- and sex-specific variations in microhabitat and macrohabitat use in a territorial lizard. Behav Ecol Sociobiol 2016. [DOI: 10.1007/s00265-016-2121-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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26
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Foo YZ, Nakagawa S, Rhodes G, Simmons LW. The effects of sex hormones on immune function: a meta-analysis. Biol Rev Camb Philos Soc 2016; 92:551-571. [DOI: 10.1111/brv.12243] [Citation(s) in RCA: 220] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 10/30/2015] [Accepted: 11/06/2015] [Indexed: 11/30/2022]
Affiliation(s)
- Yong Zhi Foo
- ARC Centre of Excellence in Cognition and its Disorders, School of Psychology, University of Western Australia; 35 Stirling Hwy Crawley Western Australia 6009 Australia
- Centre for Evolutionary Biology, School of Animal Biology, University of Western Australia; 35 Stirling Hwy Crawley Western Australia 6009 Australia
| | - Shinichi Nakagawa
- Department of Zoology; University of Otago; 340 Great King Street Dunedin 9016 New Zealand
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales; UNSW Sydney NSW 2052 Australia
| | - Gillian Rhodes
- ARC Centre of Excellence in Cognition and its Disorders, School of Psychology, University of Western Australia; 35 Stirling Hwy Crawley Western Australia 6009 Australia
| | - Leigh W. Simmons
- ARC Centre of Excellence in Cognition and its Disorders, School of Psychology, University of Western Australia; 35 Stirling Hwy Crawley Western Australia 6009 Australia
- Centre for Evolutionary Biology, School of Animal Biology, University of Western Australia; 35 Stirling Hwy Crawley Western Australia 6009 Australia
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27
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Marnocha E, Pollinger J, Smith TB. Human-induced morphological shifts in an island lizard. Evol Appl 2015; 4:388-96. [PMID: 25567980 PMCID: PMC3352549 DOI: 10.1111/j.1752-4571.2010.00170.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Accepted: 08/11/2010] [Indexed: 11/29/2022] Open
Abstract
Understanding the evolutionary consequences of anthropogenic change is an emerging topic in evolutionary biology. While highly sensitive species may go extinct in response to anthropogenic habitat alteration, those with broader environmental tolerances may persist and adapt to the changes. Here, we use morphological data from the brown anole (Anolis sagrei), a lizard species that lives in both natural and human-disturbed habitats, to examine the impact of anthropogenic habitat alteration. We find populations inhabiting disturbed habitats were significantly larger in snout-vent length, hindspan, and mass and provide evidence that the observed divergence in hindspan is driven by human-induced changes in habitat structure. Populations were found to be genetically distinct among islands but are not genetically differentiated between habitat types on islands. Thus, the observed pattern of intra-island morphological differences cannot be explained by separate founding populations. Rather, our results are consistent with morphological differences between habitats having arisen in situ on each island. Results underscore the significant impact anthropogenic change may have on evolutionary trajectories of populations that persist in human-altered habitats.
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Affiliation(s)
- Erin Marnocha
- Department of Ecology and Evolutionary Biology and Center for Tropical Research, Institute of the Environment, University of California Los Angeles, Los Angeles, CA, USA
| | - John Pollinger
- Department of Ecology and Evolutionary Biology and Center for Tropical Research, Institute of the Environment, University of California Los Angeles, Los Angeles, CA, USA
| | - Thomas B Smith
- Department of Ecology and Evolutionary Biology and Center for Tropical Research, Institute of the Environment, University of California Los Angeles, Los Angeles, CA, USA
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28
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Cox RM, Calsbeek R. Survival of the fattest? Indices of body condition do not predict viability in the brown anole (
A
nolis sagrei
). Funct Ecol 2014. [DOI: 10.1111/1365-2435.12346] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert M. Cox
- Department of Biology University of Virginia Charlottesville Virginia 22904 USA
| | - Ryan Calsbeek
- Department of Biological Sciences Dartmouth College Hanover New Hampshire 03755 USA
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29
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Calsbeek R, Duryea MC, Parker E, Cox RM. Sex-biased juvenile dispersal is adaptive but does not create genetic structure in island lizards. Behav Ecol 2014. [DOI: 10.1093/beheco/aru102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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30
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Byrne AW, Quinn JL, O'Keeffe JJ, Green S, Sleeman DP, Martin SW, Davenport J. Large-scale movements in European badgers: has the tail of the movement kernel been underestimated? J Anim Ecol 2014; 83:991-1001. [PMID: 24410133 DOI: 10.1111/1365-2656.12197] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 12/30/2013] [Indexed: 11/30/2022]
Abstract
Characterizing patterns of animal movement is a major aim in population ecology, and yet doing so at an appropriate spatial scale remains a major challenge. Estimating the frequency and distances of movements is of particular importance when species are implicated in the transmission of zoonotic diseases. European badgers (Meles meles) are classically viewed as exhibiting limited dispersal, and yet their movements bring them into conflict with farmers due to their potential to spread bovine tuberculosis in parts of their range. Considerable uncertainty surrounds the movement potential of badgers, and this may be related to the spatial scale of previous empirical studies. We conducted a large-scale mark-recapture study (755 km(2); 2008-2012; 1935 capture events; 963 badgers) to investigate movement patterns in badgers, and undertook a comparative meta-analysis using published data from 15 European populations. The dispersal movement (>1 km) kernel followed an inverse power-law function, with a substantial 'tail' indicating the occurrence of rare long-distance dispersal attempts during the study period. The mean recorded distance from this distribution was 2.6 km, the 95 percentile was 7.3 km and the longest recorded was 22.1 km. Dispersal frequency distributions were significantly different between genders; males dispersed more frequently than females, but females made proportionally more long-distance dispersal attempts than males. We used a subsampling approach to demonstrate that the appropriate minimum spatial scale to characterize badger movements in our study population was 80 km(2), substantially larger than many previous badger studies. Furthermore, the meta-analysis indicated a significant association between maximum movement distance and study area size, while controlling for population density. Maximum long-distance movements were often only recorded by chance beyond the boundaries of study areas. These findings suggest that the tail of the badger movement distribution is currently underestimated. The implications of this for understanding the spatial ecology of badger populations and for the design of disease intervention strategies are potentially significant.
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Affiliation(s)
- Andrew W Byrne
- Teagasc, Athenry Co., Galway, Ireland.,School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland.,School of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland
| | - John L Quinn
- School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland
| | - James J O'Keeffe
- School of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland.,Department of Agriculture, Food and the Marine (DAFM), Agriculture House, Kildare Street, Dublin 2, Ireland
| | - Stuart Green
- Teagasc (Spatial Analysis), Ashtown, Dublin 15, Ireland
| | - D Paddy Sleeman
- School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland
| | - S Wayne Martin
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada, N1G2W1
| | - John Davenport
- School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland
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31
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Flanagan SP, Bevier CR. Do Male Activity Level And Territory Quality Affect Female Association Time in The Brown Anole,Anolis sagrei? Ethology 2014. [DOI: 10.1111/eth.12213] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Sarah P. Flanagan
- Department of Biology; Colby College; Waterville ME USA
- Department of Biology; Texas A&M University; College Station TX USA
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32
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Kabelik D, Alix VC, Singh LJ, Johnson AL, Choudhury SC, Elbaum CC, Scott MR. Neural activity in catecholaminergic populations following sexual and aggressive interactions in the brown anole, Anolis sagrei. Brain Res 2014; 1553:41-58. [PMID: 24472578 DOI: 10.1016/j.brainres.2014.01.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Accepted: 01/16/2014] [Indexed: 01/01/2023]
Abstract
Social behaviors in vertebrates are modulated by catecholamine (CA; dopamine, norepinephrine, epinephrine) release within the social behavior neural network. Few studies have examined activity across CA populations in relation to social behaviors. The involvement of CAs in social behavior regulation is especially underexplored in reptiles, relative to other amniotes. In this study, we mapped CA populations throughout the brain (excluding retina and olfactory bulb) of the male brown anole lizard, Anolis sagrei, via immunofluorescent visualization of the rate-limiting enzyme for CA synthesis, tyrosine hydroxylase (TH). Colocalization of TH with the immediate early gene product Fos, an indirect marker of neural activity, also enabled us to relate activity in TH-immunoreactive (TH-ir) neurons to appetitive and consummatory sexual and aggressive behaviors. We detected most major TH-ir cell populations that are present in other amniotes (within the hypothalamus, midbrain, and hindbrain), although the A15 population was entirely absent. We also detected a few novel or rare cell clusters within the amygdala, medial septum, and inferior raphe. Many CA populations, especially dopaminergic groups, showed increased TH-Fos colocalization in association with appetitive and consummatory sexual behavior expression, while a small number of regions showed increased colocalization in relation to solely consummatory aggression (biting of an opponent). In conclusion, we here map CA populations throughout the brown anole brain and demonstrate evidence for catecholaminergic involvement in appetitive and consummatory sexual behaviors and consummatory aggressive behaviors in this species.
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Affiliation(s)
- David Kabelik
- Department of Biology, Rhodes College, 2000 N Parkway, Memphis, TN 38112, USA.
| | - Veronica C Alix
- Department of Biology, Rhodes College, 2000 N Parkway, Memphis, TN 38112, USA
| | - Leah J Singh
- Department of Biology, Rhodes College, 2000 N Parkway, Memphis, TN 38112, USA
| | - Alyssa L Johnson
- Department of Biology, Rhodes College, 2000 N Parkway, Memphis, TN 38112, USA
| | - Shelley C Choudhury
- Department of Biology, Rhodes College, 2000 N Parkway, Memphis, TN 38112, USA
| | - Caroline C Elbaum
- Department of Biology, Rhodes College, 2000 N Parkway, Memphis, TN 38112, USA
| | - Madeline R Scott
- Department of Biology, Rhodes College, 2000 N Parkway, Memphis, TN 38112, USA
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33
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Qi Y, Yang W, Lu B, Fu J. Genetic evidence for male-biased dispersal in the Qinghai toad-headed agamid Phrynocephalus vlangalii and its potential link to individual social interactions. Ecol Evol 2013; 3:1219-30. [PMID: 23762509 PMCID: PMC3678477 DOI: 10.1002/ece3.532] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 02/19/2013] [Accepted: 02/20/2013] [Indexed: 11/08/2022] Open
Abstract
Sex-biased dispersal has profound impacts on a species' biology and several factors have been attributed to its evolution, including mating system, inbreeding avoidance, and social complexity. Sex-biased dispersal and its potential link to individual social interactions were examined in the Qinghai toad-headed agamid (Phrynocephalus vlangalii). We first determined the pattern of sex-biased dispersal using population genetic methods. A total of 345 specimens from 32 sites in the Qaidam Basin were collected and genotyped for nine microsatellite DNA loci. Both individual-based assignment tests and allele frequency-based analyses were conducted. Females revealed much more genetic structure than males and all results were consistent with male-biased dispersal. First-generation migrants were also identified by genetic data. We then examined eight social interaction-related morphological traits and explored their potential link to sex-biased dispersal. Female residents had larger heads and longer tails than female migrants. The well-developed signal system among females, coupled with viviparity, might make remaining on natal sites beneficial, and hence promote female philopatry. Dominant females with larger heads were more likely to stay. Contrary to females, male migrants had larger heads and belly patches than residents, suggesting that dispersal might confer selective advantages for males. Such advantages may include opportunities for multiple mating and escaping from crowded sites. Large belly patches and several other morphological traits may assist their success in obtaining mates during dispersal. Furthermore, a relatively high relatedness (R = 0.06) among females suggested that this species might have rudimentary social structure. Case studies in "less" social species may provide important evidence for a better understanding of sex-biased dispersal.
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Affiliation(s)
- Yin Qi
- Chengdu Institute of Biology, Chinese Academy of Sciences Chengdu, Sichuan, 610041, China
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Dill AK, Sanger TJ, Battles AC, Johnson MA. Sexual dimorphisms in habitat‐specific morphology and behavior in the green anole lizard. J Zool (1987) 2013. [DOI: 10.1111/jzo.12020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. K. Dill
- Department of Biology Trinity University San Antonio TX USA
| | - T. J. Sanger
- Museum of Comparative Zoology Harvard University Cambridge MA USA
- Department of Organismic and Evolutionary Biology Harvard University Cambridge MA USA
| | - A. C. Battles
- Department of Biology Trinity University San Antonio TX USA
| | - M. A. Johnson
- Department of Biology Trinity University San Antonio TX USA
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Progeny sex ratios in a short-lived lizard: seasonal invariance despite sex-specific effects of hatching date on fitness. Evol Ecol 2012. [DOI: 10.1007/s10682-012-9575-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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36
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37
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Calsbeek R, Cox RM. Experimentally assessing the relative importance of predation and competition as agents of selection. Nature 2010; 465:613-6. [PMID: 20453837 DOI: 10.1038/nature09020] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2009] [Accepted: 03/17/2010] [Indexed: 11/09/2022]
Abstract
Field experiments that measure natural selection in response to manipulations of the selective regime are extremely rare, even in systems where the ecological basis of adaptation has been studied extensively. The adaptive radiation of Caribbean Anolis lizards has been studied for decades, leading to precise predictions about the influence of alternative agents of selection in the wild. Here we present experimental evidence for the relative importance of two putative agents of selection in shaping the adaptive landscape for a classic island radiation. We manipulated whole-island populations of the brown anole lizard, Anolis sagrei, to measure the relative importance of predation versus competition as agents of natural selection. We excluded or included bird and snake predators across six islands that ranged from low to high population densities of lizards, then measured subsequent differences in behaviour and natural selection in each population. Predators altered the lizards' perching behaviour and increased mortality, but predation treatments did not alter selection on phenotypic traits. By contrast, experimentally increasing population density dramatically increased the strength of viability selection favouring large body size, long relative limb length and high running stamina. Our results from A. sagrei are consistent with the hypothesis that intraspecific competition is more important than predation in shaping the selective landscape for traits central to the adaptive radiation of Anolis ecomorphs.
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Affiliation(s)
- Ryan Calsbeek
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA.
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Calsbeek R, Bonvini L, Cox RM. Geographic variation, frequency-dependent selection, and the maintenance of a female-limited polymorphism. Evolution 2009; 64:116-25. [PMID: 19663989 DOI: 10.1111/j.1558-5646.2009.00808.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A central problem in evolutionary biology is to understand how spatial and temporal variation in selection maintain genetic variation within and among populations. Brown anole lizards (Anolis sagrei) exhibit a dorsal pattern polymorphism that is expressed only in females, which occur in "diamond,""bar," and intermediate "diamond-bar" morphs. To understand the inheritance of this polymorphism, we conducted a captive breeding study that refuted several single-locus models and supported a two-locus mode of inheritance. To describe geographic variation in morph frequencies, we surveyed 13 populations from two major islands in The Bahamas. Morph frequencies differed substantially between major islands but were highly congruent within each island. Finally, we measured viability selection on each island to test two hypotheses regarding the maintenance of the polymorphism: (1) that spatial variation in selection maintains variation in morph frequencies between islands, and (2) that temporal variation in selection across years maintains variation within islands. Although bar females had relatively lower survival where they were rare, our data do not otherwise suggest that selection varies spatially between islands. However, diamond-bar females were subject to positive frequency-dependent selection across years, and the relative fitness of bar and diamond females alternated across years. We propose that this polymorphism is maintained by temporal variation in selection coupled with the sheltering of alleles via a two-locus inheritance pattern and sex-limited expression.
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Affiliation(s)
- Ryan Calsbeek
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA.
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