1
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Hill RW. Nestling Altricial Rodents and Lagomorphs Are Not Ectotherms. Physiol Biochem Zool 2022; 95:474-483. [DOI: 10.1086/721446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Ohrnberger SA, Hambly C, Speakman JR, Valencak TG. Limits to sustained energy intake. XXXII. Hot again: dorsal shaving increases energy intake and milk output in golden hamsters ( Mesocricetus auratus). J Exp Biol 2020; 223:jeb230383. [PMID: 33188060 DOI: 10.1242/jeb.230383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 11/09/2020] [Indexed: 12/16/2022]
Abstract
Golden hamsters have four times the body size of mice, raise very large litters and are required to produce large quantities of milk during the 18-day lactation period. We have previously proposed that they may be prone to being limited by their heat dissipation capacity. Studies where lactating females are shaved to elevate their heat dissipation capacity have yielded conflicting data so far. With their short pregnancy of ∼18 days, the large litters and the reported high skin temperatures, they may serve as an ideal model to elucidate the role of epilation for energy budgets in lactating mammals. We shaved one group of lactating females dorsally on the sixth day of lactation, and tested if the elevated heat dissipation capacity would enable them to have higher energy intakes and better food-to-milk conversion rates. Indeed, we observed that females from the shaved group had 6% higher body mass and 0.78°C lower skin temperature than control females during lactation. When focusing on the phase of peak lactation, we observed significantly higher (10%) gross energy intake of food and 23.4% more milk energy output in the shaved females, resulting in 3.3 g higher individual pup weights. We conclude that shaving off the females' fur, even though restricted to the dorsal surface, had large consequences on female energy metabolism in lactation and improved milk production and pup growth in line with our previous work on heat dissipation limitation. Our new data from golden hamsters confirm heat dissipation as a limiting factor for sustained metabolic rate in lactation in some small mammals and emphasise the large effects of a relatively small manipulation such as fur removal on energy metabolism of lactating females.
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Affiliation(s)
- S A Ohrnberger
- Institute of Physiology, Pathophysiology and Biophysics, Department of Biomedical Sciences, University of Veterinary Medicine Vienna, Veterinärplatz 1, A-1210 Vienna, Austria
| | - C Hambly
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
| | - J R Speakman
- Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
- Institute of Genetics and Developmental Biology, State Key Laboratory of Molecular Developmental Biology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
- CAS Center of Excellence in Animal Evolution and Genetics, Kunming 650223, China
| | - T G Valencak
- Institute of Physiology, Pathophysiology and Biophysics, Department of Biomedical Sciences, University of Veterinary Medicine Vienna, Veterinärplatz 1, A-1210 Vienna, Austria
- College of Animal Sciences, Zhejiang University, Zijingang Campus, 866 Yuhangtang Road, 310058 Hangzhou, People's Republic of China
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Thomas F, Giraudeau M, Dheilly NM, Gouzerh F, Boutry J, Beckmann C, Biro PA, Hamede R, Abadie J, Labrut S, Bieuville M, Misse D, Bramwell G, Schultz A, Le Loc'h G, Vincze O, Roche B, Renaud F, Russell T, Ujvari B. Rare and unique adaptations to cancer in domesticated species: An untapped resource? Evol Appl 2020. [DOI: 10.1111/eva.12920] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Frédéric Thomas
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - Mathieu Giraudeau
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - Nolwenn M. Dheilly
- School of Marine and Atmospheric Sciences Stony Brook University Stony Brook NY USA
| | - Flora Gouzerh
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - Justine Boutry
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - Christa Beckmann
- Centre for Integrative Ecology School of Life and Environmental Sciences Deakin University Waurn Ponds VIC Australia
- School of Science Western Sydney UniversityParramatta NSW Australia
| | - Peter A. Biro
- Centre for Integrative Ecology School of Life and Environmental Sciences Deakin University Waurn Ponds VIC Australia
| | - Rodrigo Hamede
- School of Natural Sciences University of Tasmania Hobart TAS Australia
| | | | | | - Margaux Bieuville
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - Dorothée Misse
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - Georgina Bramwell
- Centre for Integrative Ecology School of Life and Environmental Sciences Deakin University Waurn Ponds VIC Australia
| | - Aaron Schultz
- Centre for Integrative Ecology School of Life and Environmental Sciences Deakin University Waurn Ponds VIC Australia
| | - Guillaume Le Loc'h
- Clinique des NAC et de la Faune Sauvage, UMR IHAP École Nationale Vétérinaire de Toulouse Toulouse France
| | - Orsolya Vincze
- Hungarian Department of Biology and Ecology Evolutionary Ecology Group Babeş‐Bolyai University Cluj‐Napoca Romania
- Department of Tisza Research MTA Centre for Ecological Research‐DRI Debrecen Hungary
| | - Benjamin Roche
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
- Unité mixte Internationale de Modélisation Mathématique et Informatique des Systèmes Complexes UMI IRD/Sorbonne UniversitéUMMISCO Bondy France
| | - François Renaud
- CREECUMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - Tracey Russell
- School of Life and Environmental Sciences The University of Sydney Sydney NSW Australia
| | - Beata Ujvari
- Centre for Integrative Ecology School of Life and Environmental Sciences Deakin University Waurn Ponds VIC Australia
- School of Natural Sciences University of Tasmania Hobart TAS Australia
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4
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Marsh JN, Vega-Trejo R, Jennions MD, Head ML. Why does inbreeding reduce male paternity? Effects on sexually selected traits. Evolution 2017; 71:2728-2737. [PMID: 28857148 DOI: 10.1111/evo.13339] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 08/16/2017] [Indexed: 01/17/2023]
Abstract
Mating with relatives has often been shown to negatively affect offspring fitness (inbreeding depression). There is considerable evidence for inbreeding depression due to effects on naturally selected traits, particularly those expressed early in life, but there is less evidence of it for sexually selected traits. This is surprising because sexually selected traits are expected to exhibit strong inbreeding depression. Here, we experimentally created inbred and outbred male mosquitofish (Gambusia holbrooki). Inbred males were the offspring of matings between full siblings. We then investigated how inbreeding influenced a number of sexually selected male traits, specifically: attractiveness, sperm number and velocity, as well as sperm competitiveness based on a male's share of paternity. We found no inbreeding depression for male attractiveness or sperm traits. There was, however, evidence that lower heterozygosity decreased paternity due to reduced sperm competitiveness. Our results add to the growing evidence that competitive interactions exacerbate the negative effects of the increased homozygosity that arises when there is inbreeding.
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Affiliation(s)
- Jason N Marsh
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Regina Vega-Trejo
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Michael D Jennions
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia.,Wissenschaftskolleg zu Berlin, Wallotstaße 19, 14193 Berlin, Germany
| | - Megan L Head
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
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5
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Ohrnberger SA, Monclús R, Rödel HG, Valencak TG. Ambient temperature affects postnatal litter size reduction in golden hamsters. Front Zool 2016; 13:51. [PMID: 27904644 PMCID: PMC5121935 DOI: 10.1186/s12983-016-0183-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 11/15/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To better understand how different ambient temperatures during lactation affect survival of young, we studied patterns of losses of pups in golden hamsters (Mesocricetus auratus) at different ambient temperatures in the laboratory, mimicking temperature conditions in natural habitats. Golden hamsters produce large litters of more than 10 young but are also known to wean fewer pups at the end of lactation than they give birth to. We wanted to know whether temperature affects litter size reductions and whether the underlying causes of pup loss were related to maternal food (gross energy) intake and reproductive performance, such as litter growth. For that, we exposed lactating females to three different ambient temperatures and investigated associations with losses of offspring between birth and weaning. RESULTS Overall, around one third of pups per litter disappeared, obviously consumed by the mother. Such litter size reductions were greatest at 30 °C, in particular during the intermediate postnatal period around peak lactation. Furthermore, litter size reductions were generally higher in larger litters. Maternal gross energy intake was highest at 5 °C suggesting that mothers were not limited by milk production and might have been able to raise a higher number of pups until weaning. This was further supported by the fact that the daily increases in litter mass as well as in the individual pup body masses, a proxy of mother's lactational performance, were lower at higher ambient temperatures. CONCLUSIONS We suggest that ambient temperatures around the thermoneutral zone and beyond are preventing golden hamster females from producing milk at sufficient rates. Around two thirds of the pups per litter disappeared at high temperature conditions, and their early growth rates were significantly lower than at lower ambient temperatures. It is possible that these losses are due to an intrinsic physiological limitation (imposed by heat dissipation) compromising maternal energy intake and milk production.
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Affiliation(s)
- Sarah A. Ohrnberger
- Institute of Physiology, Pathophysiology and Biophysics, Veterinary University Vienna, Vienna, Austria
| | - Raquel Monclús
- Ecologie Systématique Evolution, University Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, F-91400 Orsay, France
| | - Heiko G. Rödel
- Laboratoire d’Ethologie Expérimentale et Comparée E.A. 4443, Université Paris 13, Sorbonne Paris Cité, F-93430 Villetaneuse, France
| | - Teresa G. Valencak
- Institute of Physiology, Pathophysiology and Biophysics, Veterinary University Vienna, Vienna, Austria
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6
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Opatová P, Ihle M, Albrechtová J, Tomášek O, Kempenaers B, Forstmeier W, Albrecht T. Inbreeding depression of sperm traits in the zebra finch Taeniopygia guttata. Ecol Evol 2015; 6:295-304. [PMID: 26811793 PMCID: PMC4716522 DOI: 10.1002/ece3.1868] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 11/05/2015] [Accepted: 11/06/2015] [Indexed: 11/08/2022] Open
Abstract
Inbreeding depression, or the reduction in fitness due to mating between close relatives, is a key issue in biology today. Inbreeding negatively affects many fitness‐related traits, including survival and reproductive success. Despite this, very few studies have quantified the effects of inbreeding on vertebrate gamete traits under controlled breeding conditions using a full‐sib mating approach. Here, we provide comprehensive evidence for the negative effect of inbreeding on sperm traits in a bird, the zebra finch Taeniopygia guttata. We compared sperm characteristics of both inbred (pedigree F = 0.25) and outbred (pedigree F = 0) individuals from two captive populations, one domesticated and one recently wild‐derived, raised under standardized conditions. As normal spermatozoa morphology did not differ consistently between inbred and outbred individuals, our study confirms the hypothesis that sperm morphology is not particularly susceptible to inbreeding depression. Inbreeding did, however, lead to significantly lower sperm motility and a substantially higher percentage of abnormal spermatozoa in ejaculate. These results were consistent across both study populations, confirming the generality and reliability of our findings.
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Affiliation(s)
- Pavlína Opatová
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 267/2CZ-61137 Brno Czech Republic
| | - Malika Ihle
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard-Gwinner-Strasse 7 82319 Seewiesen Germany
| | - Jana Albrechtová
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Charles University in Prague Faculty of Sciences Department of Zoology Viničná 7CZ-12844 Prague Czech Republic
| | - Oldřich Tomášek
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Charles University in Prague Faculty of Sciences Department of Zoology Viničná 7CZ-12844 Prague Czech Republic
| | - Bart Kempenaers
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard-Gwinner-Strasse 7 82319 Seewiesen Germany
| | - Wolfgang Forstmeier
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard-Gwinner-Strasse 7 82319 Seewiesen Germany
| | - Tomáš Albrecht
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Charles University in Prague Faculty of Sciences Department of Zoology Viničná 7CZ-12844 Prague Czech Republic
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7
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Larson G, Fuller DQ. The Evolution of Animal Domestication. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2014. [DOI: 10.1146/annurev-ecolsys-110512-135813] [Citation(s) in RCA: 322] [Impact Index Per Article: 32.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Greger Larson
- Durham Evolution and Ancient DNA, Department of Archaeology, Durham University, Durham DH1 3LE, United Kingdom;
| | - Dorian Q. Fuller
- Institute of Archaeology, University College London, London WC1H 0PY, United Kingdom
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8
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Losdat S, Chang SM, Reid JM. Inbreeding depression in male gametic performance. J Evol Biol 2014; 27:992-1011. [DOI: 10.1111/jeb.12403] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 04/01/2014] [Accepted: 04/02/2014] [Indexed: 12/23/2022]
Affiliation(s)
- S. Losdat
- Institute of Biological and Environmental Sciences; School of Biological Sciences; University of Aberdeen; Aberdeen UK
| | - S.-M. Chang
- Plant Biology Department; University of Georgia; Athens GA USA
| | - J. M. Reid
- Institute of Biological and Environmental Sciences; School of Biological Sciences; University of Aberdeen; Aberdeen UK
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9
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Meunier J, Kölliker M. Inbreeding depression in an insect with maternal care: influences of family interactions, life stage and offspring sex. J Evol Biol 2013; 26:2209-20. [DOI: 10.1111/jeb.12217] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 06/16/2013] [Indexed: 01/19/2023]
Affiliation(s)
- J. Meunier
- Zoological Institute; Evolutionary Biology; Johannes Gutenberg University Mainz; Mainz Germany
| | - M. Kölliker
- Department of Environmental Sciences; Zoology and Evolution; University of Basel; Basel Switzerland
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10
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11
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Tadesse T, Cheng Q, Xu M, Baro DJ, Young LJ, Pallas SL. Regulation of ephrin-A expression in compressed retinocollicular maps. Dev Neurobiol 2012; 73:274-96. [PMID: 23008269 DOI: 10.1002/dneu.22059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Revised: 09/14/2012] [Accepted: 09/18/2012] [Indexed: 11/11/2022]
Abstract
Retinotopic maps can undergo compression and expansion in response to changes in target size, but the mechanism underlying this compensatory process has remained a mystery. The discovery of ephrins as molecular mediators of Sperry's chemoaffinity process allows a mechanistic approach to this important issue. In Syrian hamsters, neonatal, partial (PT) ablation of posterior superior colliculus (SC) leads to compression of the retinotopic map, independent of neural activity. Graded, repulsive EphA receptor/ephrin-A ligand interactions direct the formation of the retinocollicular map, but whether ephrins might also be involved in map compression is unknown. To examine whether map compression might be directed by changes in the ephrin expression pattern, we compared ephrin-A2 and ephrin-A5 mRNA expression between normal SC and PT SC using in situ hybridization and quantitative real-time PCR. We found that ephrin-A ligand expression in the compressed maps was low anteriorly and high posteriorly, as in normal animals. Consistent with our hypothesis, the steepness of the ephrin gradient increased in the lesioned colliculi. Interestingly, overall levels of ephrin-A2 and -A5 expression declined immediately after neonatal target damage, perhaps promoting axon outgrowth. These data establish a correlation between changes in ephrin-A gradients and map compression, and suggest that ephrin-A expression gradients may be regulated by target size. This in turn could lead to compression of the retinocollicular map onto the reduced target. These findings have important implications for mechanisms of recovery from traumatic brain injury.
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Affiliation(s)
- Tizeta Tadesse
- Neuroscience Institute, Department of Biology, Graduate Program in Neurobiology & Behavior, Georgia State University, Atlanta, Georgia, USA
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12
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Beery AK, Zucker I. Sex ratio adjustment by sex-specific maternal cannibalism in hamsters. Physiol Behav 2012; 107:271-6. [PMID: 22982672 DOI: 10.1016/j.physbeh.2012.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Accepted: 09/04/2012] [Indexed: 10/27/2022]
Abstract
Mammalian offspring sex ratios can be biased via prenatal and postnatal mechanisms, including sperm selection, sex-specific embryo loss, and differential postnatal investment in males and females. Syrian hamsters routinely cannibalize some of their pups in the first days after birth. We present evidence that short day lengths, typically predictive of poor autumn and winter field conditions, are associated with male-biased sex ratios, achieved in part through selective perinatal maternal infanticide of female offspring. Higher peak litter sizes were associated with increased cannibalism rates, decreased final litter counts, and increased body mass of pups surviving to weaning. To our knowledge this is the first report of sex ratio adjustment by offspring cannibalism.
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Affiliation(s)
- Annaliese K Beery
- Department of Psychology, Neuroscience Program, Smith College, Northampton, MA, USA.
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13
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Schneider N, Fritzsche P. Isolation calls and retrieving behavior in laboratory and wild-derived golden hamsters—No sign for inbreeding depression. Mamm Biol 2011. [DOI: 10.1016/j.mambio.2011.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Markert JA, Champlin DM, Gutjahr-Gobell R, Grear JS, Kuhn A, McGreevy TJ, Roth A, Bagley MJ, Nacci DE. Population genetic diversity and fitness in multiple environments. BMC Evol Biol 2010; 10:205. [PMID: 20609254 PMCID: PMC2927917 DOI: 10.1186/1471-2148-10-205] [Citation(s) in RCA: 133] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2009] [Accepted: 07/07/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND When a large number of alleles are lost from a population, increases in individual homozygosity may reduce individual fitness through inbreeding depression. Modest losses of allelic diversity may also negatively impact long-term population viability by reducing the capacity of populations to adapt to altered environments. However, it is not clear how much genetic diversity within populations may be lost before populations are put at significant risk. Development of tools to evaluate this relationship would be a valuable contribution to conservation biology. To address these issues, we have created an experimental system that uses laboratory populations of an estuarine crustacean, Americamysis bahia with experimentally manipulated levels of genetic diversity. We created replicate cultures with five distinct levels of genetic diversity and monitored them for 16 weeks in both permissive (ambient seawater) and stressful conditions (diluted seawater). The relationship between molecular genetic diversity at presumptive neutral loci and population vulnerability was assessed by AFLP analysis. RESULTS Populations with very low genetic diversity demonstrated reduced fitness relative to high diversity populations even under permissive conditions. Population performance decreased in the stressful environment for all levels of genetic diversity relative to performance in the permissive environment. Twenty percent of the lowest diversity populations went extinct before the end of the study in permissive conditions, whereas 73% of the low diversity lines went extinct in the stressful environment. All high genetic diversity populations persisted for the duration of the study, although population sizes and reproduction were reduced under stressful environmental conditions. Levels of fitness varied more among replicate low diversity populations than among replicate populations with high genetic diversity. There was a significant correlation between AFLP diversity and population fitness overall; however, AFLP markers performed poorly at detecting modest but consequential losses of genetic diversity. High diversity lines in the stressful environment showed some evidence of relative improvement as the experiment progressed while the low diversity lines did not. CONCLUSIONS The combined effects of reduced average fitness and increased variability contributed to increased extinction rates for very low diversity populations. More modest losses of genetic diversity resulted in measurable decreases in population fitness; AFLP markers did not always detect these losses. However when AFLP markers indicated lost genetic diversity, these losses were associated with reduced population fitness.
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Affiliation(s)
- Jeffrey A Markert
- Population Ecology Branch, Atlantic Ecology Division, U.S. Environmental Protection Agency, 27 Tarzwell Dr., Narragansett RI, USA
- Molecular Ecology Research Branch, Ecological Exposure Research Division, U.S. Environmental Protection Agency, 26 Martin Luther King Dr., Cincinnati OH 45268, USA
- c/o U.S. Geological Survey, San Diego Field Station, Western Ecology Research Center, 4165 Spruance Rd., San Diego, CA 92101, USA
| | - Denise M Champlin
- Population Ecology Branch, Atlantic Ecology Division, U.S. Environmental Protection Agency, 27 Tarzwell Dr., Narragansett RI, USA
| | - Ruth Gutjahr-Gobell
- Population Ecology Branch, Atlantic Ecology Division, U.S. Environmental Protection Agency, 27 Tarzwell Dr., Narragansett RI, USA
| | - Jason S Grear
- Population Ecology Branch, Atlantic Ecology Division, U.S. Environmental Protection Agency, 27 Tarzwell Dr., Narragansett RI, USA
| | - Anne Kuhn
- Population Ecology Branch, Atlantic Ecology Division, U.S. Environmental Protection Agency, 27 Tarzwell Dr., Narragansett RI, USA
| | - Thomas J McGreevy
- Population Ecology Branch, Atlantic Ecology Division, U.S. Environmental Protection Agency, 27 Tarzwell Dr., Narragansett RI, USA
- Department of Natural Resources Science, Coastal Institute, University of Rhode Island, 1 Greenhouse Rd., Kingston RI 02881, USA
| | - Annette Roth
- Molecular Ecology Research Branch, Ecological Exposure Research Division, U.S. Environmental Protection Agency, 26 Martin Luther King Dr., Cincinnati OH 45268, USA
| | - Mark J Bagley
- Molecular Ecology Research Branch, Ecological Exposure Research Division, U.S. Environmental Protection Agency, 26 Martin Luther King Dr., Cincinnati OH 45268, USA
| | - Diane E Nacci
- Population Ecology Branch, Atlantic Ecology Division, U.S. Environmental Protection Agency, 27 Tarzwell Dr., Narragansett RI, USA
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15
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Michalczyk L, Martin OY, Millard AL, Emerson BC, Gage MJG. Inbreeding depresses sperm competitiveness, but not fertilization or mating success in male Tribolium castaneum. Proc Biol Sci 2010; 277:3483-91. [PMID: 20554548 DOI: 10.1098/rspb.2010.0514] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
As populations decline to levels where reproduction among close genetic relatives becomes more probable, subsequent increases in homozygous recessive deleterious expression and/or loss of heterozygote advantage can lead to inbreeding depression. Here, we measure how inbreeding across replicate lines of the flour beetle Tribolium castaneum impacts on male reproductive fitness in the absence or presence of male-male competition. Effects on male evolution from mating pattern were removed by enforcing monogamous mating throughout. After inbreeding across eight generations, we found that male fertility in the absence of competition was unaffected. However, we found significant inbreeding depression of sperm competitiveness: non-inbred males won 57 per cent of fertilizations in competition, while inbred equivalents only sired 42 per cent. We also found that the P(2) 'offence' role in sperm competition was significantly more depressed under inbreeding than sperm 'defence' (P(1)). Mating behaviour did not explain these differences, and there was no difference in the viability of offspring sired by inbred or non-inbred males. Sperm length variation was significantly greater in the ejaculates of inbred males. Our results show that male ability to achieve normal fertilization success was not depressed under strong inbreeding, but that inbreeding depression in these traits occurred when conditions of sperm competition were generated.
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Affiliation(s)
- Lukasz Michalczyk
- School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK.
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16
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Ruiz-Lopez MJ, Evenson DP, Espeso G, Gomendio M, Roldan ERS. High levels of DNA fragmentation in spermatozoa are associated with inbreeding and poor sperm quality in endangered ungulates. Biol Reprod 2010; 83:332-8. [PMID: 20505170 DOI: 10.1095/biolreprod.110.084798] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Inbreeding is known to cause deleterious effects upon reproduction and survival, but its effects upon sperm DNA integrity have not been examined. In the present study, we analyzed this relationship among three endangered ungulates: Gazella cuvieri, Gazella dama mhorr, and Gazella dorcas neglecta. In addition, we examined whether levels of sperm DNA fragmentation are associated with semen quality. The magnitude of sperm DNA damage in the two species with high levels of inbreeding (G. cuvieri and G. dama mhorr) was extremely high when compared to the species with low levels of inbreeding (G. dorcas neglecta) and to values previously reported for outbred populations. Levels of sperm DNA fragmentation significantly increased with inbreeding and age. Increased DNA damage in sperm was associated with increased sperm head abnormalities, lower percentage of sperm with an intact acrosome, and poor motility. Our findings suggest that the link between inbreeding and semen quality is mediated by the effects of inbreeding upon sperm DNA damage. The deleterious effects of inbreeding upon the paternal genome likely decrease male fertility and may cause genetic damage to future generations. Because inbreeding is common among endangered species, high levels of sperm DNA damage may have considerable impact upon the viability of their populations.
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Affiliation(s)
- Maria Jose Ruiz-Lopez
- Reproductive Ecology and Biology Group, Museo Nacional de Ciencias Naturales (CSIC), Madrid, Spain
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17
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DelBarco‐Trillo J, Gulewicz K, Segal A, McPhee ME, Johnston RE. Can captivity lead to inter‐species mating in two
Mesocricetus
hamster species? J Zool (1987) 2009. [DOI: 10.1111/j.1469-7998.2009.00577.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | - K. Gulewicz
- Cornell University, Department of Psychology, Ithaca, NY, USA
| | - A. Segal
- Cornell University, Department of Psychology, Ithaca, NY, USA
| | - M. E. McPhee
- Cornell University, Department of Psychology, Ithaca, NY, USA
| | - R. E. Johnston
- Cornell University, Department of Psychology, Ithaca, NY, USA
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18
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Coe TS, Hamilton PB, Griffiths AM, Hodgson DJ, Wahab MA, Tyler CR. Genetic variation in strains of zebrafish (Danio rerio) and the implications for ecotoxicology studies. ECOTOXICOLOGY (LONDON, ENGLAND) 2009; 18:144-150. [PMID: 18795247 DOI: 10.1007/s10646-008-0267-0] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Accepted: 08/29/2008] [Indexed: 05/26/2023]
Abstract
There is substantial evidence that genetic variation, at both the level of the individual and population, has a significant effect on behaviour, fitness and response to toxicants. Using DNA microsatellites, we examined the genetic variation in samples of several commonly used laboratory strains of zebrafish, Danio rerio, a model species in toxicological studies. We compared the genetic variation to that found in a sample of wild fish from Bangladesh. Our findings show that the wild fish were significantly more variable than the laboratory strains for several measures of genetic variability, including allelic richness and expected heterozygosity. This lack of variation should be given due consideration for any study which attempts to extrapolate the results of ecotoxicological laboratory tests to wild populations.
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Affiliation(s)
- T S Coe
- Environmental and Molecular Fish Biology Group, University of Exeter, Exeter, UK
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19
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Male golden hamsters (Mesocricetus auratus) are more reactive than females to a visual predator cue. J ETHOL 2008. [DOI: 10.1007/s10164-008-0099-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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