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Patterson C, Pilakouta N. Effects of Parental Care on the Magnitude of Inbreeding Depression: A Meta-Analysis in Fishes. Am Nat 2024; 203:E50-E62. [PMID: 38306289 DOI: 10.1086/728001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2024]
Abstract
AbstractInbreeding results from matings between relatives and often leads to a reduction in the fitness of inbred offspring, known as inbreeding depression. There is substantial variation in the magnitude of inbreeding depression among and within species, driven by differences in the biotic and abiotic environment. Recent studies in three species found that parental care has the potential to buffer against inbreeding depression in the offspring, but the generality of this pattern is still unknown. Here, we performed a meta-analysis to test whether variation in the magnitude of inbreeding depression is related to among-species differences in parental care in fishes. We synthesized 536 effect sizes across 56 studies and 18 species, spanning 47 years of research. We found that inbred offspring suffer a smaller reduction in fitness in species that provide biparental care than in species with uniparental or no care. By using a comparative approach, this study provides novel insights into the capacity of parental care to moderate inbreeding depression and suggests that these effects may currently be underappreciated. Considering the potential effects of parental care on inbreeding depression can help us understand why some species avoid inbreeding, whereas others tolerate or even prefer inbreeding, which has important implications for the maintenance of genetic variation within populations.
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2
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Marshall AF, Balloux F, Hemmings N, Brekke P. Systematic review of avian hatching failure and implications for conservation. Biol Rev Camb Philos Soc 2023; 98:807-832. [PMID: 36635252 DOI: 10.1111/brv.12931] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 12/21/2022] [Accepted: 12/30/2022] [Indexed: 01/14/2023]
Abstract
Avian hatching failure is a widespread phenomenon, affecting around 10% of all eggs that are laid and not lost to predation, damage, or desertion. Our understanding of hatching failure is limited in terms of both its underpinning mechanisms and its occurrence across different populations. It is widely acknowledged that rates of hatching failure are higher in threatened species and in populations maintained in captivity compared to wild, non-threatened species, but these differences have rarely been quantified and any broader patterns remain unexplored. To examine the associations between threat status, management interventions, and hatching failure across populations we conducted a phylogenetically controlled multilevel meta-analysis across 231 studies and 241 species of birds. Our data set included both threatened (Critically Endangered, Endangered, and Vulnerable) and non-threatened (Near Threatened and Least Concern) species across wild and captive populations, as well as 'wild managed' ('free-living') populations. We found the mean overall rate of hatching failure across all populations to be 16.79%, with the hatching failure rate of wild, non-threatened species being 12.40%. We found that populations of threatened species experienced significantly higher mean hatching failure than populations of non-threatened species. Different levels of management were also associated with different rates of hatching failure, with wild populations experiencing the lowest rate of hatching failure, followed by wild managed populations, and populations in captivity experiencing the highest rate. Similarly, populations that were subject to the specific management interventions of artificial incubation, supplementary feeding, and artificial nest provision displayed significantly higher rates of hatching failure than populations without these interventions. The driver of this correlation between hatching failure and management remains unclear, but could be an indirect result of threatened species being more likely to have lower hatching success and also being more likely to be subject to management, indicating that conservation efforts are fittingly being focused towards the species potentially most at risk from extinction. This is the most comprehensive comparative analysis of avian hatching failure that has been conducted to date, and the first to quantify explicitly how threat status and management are associated with the rate of hatching failure in a population. We discuss the implications of our results, focusing on their potential applications to conservation. Although we identified several factors clearly associated with variation in hatching failure, a significant amount of heterogeneity was not explained by our meta-analytical model, indicating that other factors influencing hatching failure were not included here. We discuss what these factors might be and suggest avenues for further research. Finally, we discuss the inconsistency in how hatching failure is defined and reported within the literature, and propose a standardised definition to be used in future studies which will enable better comparison across populations and ensure that the most accurate information is used to support management decisions.
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Affiliation(s)
- Ashleigh F Marshall
- Institute of Zoology, Zoological Society of London, Outer Circle, Regent's Park, London, NW1 4RY, UK
- Department of Genetics, Evolution and Environment, University College London, London, WC1E 6BT, UK
| | - François Balloux
- UCL Genetics Institute, University College London, London, WC1E 6BT, UK
| | - Nicola Hemmings
- Department of Animal & Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - Patricia Brekke
- Institute of Zoology, Zoological Society of London, Outer Circle, Regent's Park, London, NW1 4RY, UK
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3
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Dalzero A, Ross CT, Lukas D. Fitness consequences of cousin marriage: a life-history assessment in two populations. EVOLUTIONARY HUMAN SCIENCES 2022; 5:e3. [PMID: 37587940 PMCID: PMC10426087 DOI: 10.1017/ehs.2022.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 10/20/2022] [Accepted: 11/15/2022] [Indexed: 11/30/2022] Open
Abstract
Cousin marriage, a spousal union between close kin, occurs at high frequencies in many parts of the world. The rates of cousin marriage in humans are concordant with empirical studies that challenge the traditionally held view that reproduction with kin is generally avoided in animals. Similarly, some theoretical models in animal behaviour show that inbreeding avoidance is more constrained than previously thought. Such studies highlight the importance of quantifying the costs and benefits of reproduction among close kin over the whole life-course. Here, we use genealogical data from two human populations with high frequencies of cousin marriage (the Dogon from Mali, and the Ancien Régime nobility from Europe) to estimate these potential costs and benefits. We compare age-specific fertility and survival curves, as well as the projected growth rates, of subpopulations of each marriage type. Fitness costs of cousin marriage are present in terms of reduced child survival (in both populations), while benefits exist as increased fertility for men (in the Dogon) and for women (in the Ancien Régime nobility). We also find some differences in the projected growth rates of lineages as a function of marriage type. Finally, we discuss the trade-offs that might shape marriage decisions in different ecological conditions.
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Affiliation(s)
- Arianna Dalzero
- Department of Human Behavior, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
| | - Cody T. Ross
- Department of Human Behavior, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
| | - Dieter Lukas
- Department of Human Behavior, Ecology and Culture, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
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Gow EA, Arcese P, Dagenais D, Sardell RJ, Wilson S, Reid JM. Testing predictions of inclusive fitness theory in inbreeding relatives with biparental care. Proc Biol Sci 2019; 286:20191933. [PMID: 31795864 PMCID: PMC6939262 DOI: 10.1098/rspb.2019.1933] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Inclusive fitness theory predicts that parental care will vary with relatedness between potentially caring parents and offspring, potentially shaping mating system evolution. Systems with extra-pair paternity (EPP), and hence variable parent–brood relatedness, provide valuable opportunities to test this prediction. However, existing theoretical and empirical studies assume that a focal male is either an offspring's father with no inbreeding, or is completely unrelated. We highlight that this simple dichotomy does not hold given reproductive interactions among relatives, complicating the effect of EPP on parent–brood relatedness yet providing new opportunities to test inclusive fitness theory. Accordingly, we tested hierarchical hypotheses relating parental feeding rate to parent–brood relatedness, parent kinship and inbreeding, using song sparrows (Melospiza melodia) experiencing natural variation in relatedness. As predicted, male and female feeding rates increased with relatedness to a dependent brood, even controlling for brood size. Male feeding rate tended to decrease as paternity loss increased, and increased with increasing kinship and hence inbreeding between socially paired mates. We thereby demonstrate that variation in a key component of parental care concurs with subtle predictions from inclusive fitness theory. We additionally highlight that such effects can depend on the underlying social mating system, potentially generating status-specific costs of extra-pair reproduction.
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Affiliation(s)
- Elizabeth A Gow
- Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Peter Arcese
- Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Danielle Dagenais
- Natural Resources and Environmental Studies, University of Northern British Columbia, Prince George, British Columbia, Canada
| | - Rebecca J Sardell
- School of Biological Sciences, University of Aberdeen, Aberdeen, Scotland
| | - Scott Wilson
- Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada.,National Wildlife Research Centre, Environment and Climate Change Canada, Ottawa, Ontario, Canada
| | - Jane M Reid
- School of Biological Sciences, University of Aberdeen, Aberdeen, Scotland.,Centre for Biodiversity Dynamics, Norwegian University of Science and Technology, Trondheim, Norway
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Pineaux M, Blanchard P, Danchin É, Hatch SA, Helfenstein F, Mulard H, White J, Leclaire S, Wagner RH. Behavioural avoidance of sperm ageing depends on genetic similarity of mates in a monogamous seabird. Biol J Linn Soc Lond 2019. [DOI: 10.1093/biolinnean/blz079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Inbreeding, i.e. the mating of genetically related individuals, can lead to reduced fitness and is considered to be a major selective force of mate choice. Although inbreeding avoidance has been found in numerous taxa, individuals may face constraints when pairing, leading to mating with suboptimal partners. In such circumstances, individuals that are able to avoid factors exacerbating detrimental effects of inbreeding should be favoured. Using the socially and genetically monogamous black-legged kittiwake (Rissa tridactyla), we explored whether the detrimental effects of inbreeding are exacerbated by sperm ageing (i.e. the post-meiotic senescence of sperm cells, mainly occurring within the female tracts after copulation), and whether they can be mitigated by behavioural tactics. First, by experimentally manipulating the age of the fertilizing sperm, we found that hatching failure due to sperm ageing increased with higher genetic similarity between mates. We then investigated whether more genetically similar pairs exhibited mating behaviours that prevent fertilization by old sperm. The more genetically similar mates were, the less likely they were to copulate early in the reproductive season and the more females performed post-copulatory sperm ejections. By flexibly adapting their behaviour in response to within-pair genetic similarity, kittiwakes may avoid exacerbation of inbreeding costs due to sperm ageing.
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Affiliation(s)
- Maxime Pineaux
- Laboratoire Évolution & Diversité Biologique (EDB UMR), Université de Toulouse Midi-Pyrénées, CNRS, IRD, UPS, route de Narbonne, Bat, Toulouse cedex, France
| | - Pierrick Blanchard
- Laboratoire Évolution & Diversité Biologique (EDB UMR), Université de Toulouse Midi-Pyrénées, CNRS, IRD, UPS, route de Narbonne, Bat, Toulouse cedex, France
| | - Étienne Danchin
- Laboratoire Évolution & Diversité Biologique (EDB UMR), Université de Toulouse Midi-Pyrénées, CNRS, IRD, UPS, route de Narbonne, Bat, Toulouse cedex, France
| | - Scott A Hatch
- Institute for Seabird Research and Conservation, Mountain Place, Anchorage, AK, USA
| | - Fabrice Helfenstein
- Laboratory of Evolutionary Ecophysiology, Institute of Biology, Faculty of Sciences, University of Neuchâtel, Neuchâtel, Switzerland
| | - Hervé Mulard
- Laboratoire Évolution & Diversité Biologique (EDB UMR), Université de Toulouse Midi-Pyrénées, CNRS, IRD, UPS, route de Narbonne, Bat, Toulouse cedex, France
| | - Joël White
- Laboratoire Évolution & Diversité Biologique (EDB UMR), Université de Toulouse Midi-Pyrénées, CNRS, IRD, UPS, route de Narbonne, Bat, Toulouse cedex, France
| | - Sarah Leclaire
- Laboratoire Évolution & Diversité Biologique (EDB UMR), Université de Toulouse Midi-Pyrénées, CNRS, IRD, UPS, route de Narbonne, Bat, Toulouse cedex, France
| | - Richard H Wagner
- Konrad-Lorenz-Institute of Ethology, Department of Integrative Biology and Evolution, University of Veterinarian Medicine Vienna, Savoyenstr., Vienna, Austria
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Wells DA, Cant MA, Nichols HJ, Hoffman JI. A high-quality pedigree and genetic markers both reveal inbreeding depression for quality but not survival in a cooperative mammal. Mol Ecol 2018; 27:2271-2288. [PMID: 29603504 DOI: 10.1111/mec.14570] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 03/05/2018] [Accepted: 03/12/2018] [Indexed: 01/07/2023]
Abstract
Inbreeding depression, the reduced fitness of offspring of closely related parents, is commonplace in both captive and wild populations and has important consequences for conservation and mating system evolution. However, because of the difficulty of collecting pedigree and life-history data from wild populations, relatively few studies have been able to compare inbreeding depression for traits at different points in the life cycle. Moreover, pedigrees give the expected proportion of the genome that is identical by descent (IBDg ) whereas in theory with enough molecular markers realized IBDg can be quantified directly. We therefore investigated inbreeding depression for multiple life-history traits in a wild population of banded mongooses using pedigree-based inbreeding coefficients (fped ) and standardized multilocus heterozygosity (sMLH) measured at 35-43 microsatellites. Within an information theoretic framework, we evaluated support for either fped or sMLH as inbreeding terms and used sequential regression to determine whether the residuals of sMLH on fped explain fitness variation above and beyond fped . We found no evidence of inbreeding depression for survival, either before or after nutritional independence. By contrast, inbreeding was negatively associated with two quality-related traits, yearling body mass and annual male reproductive success. Yearling body mass was associated with fped but not sMLH, while male annual reproductive success was best explained by both fped and residual sMLH. Thus, our study not only uncovers variation in the extent to which different traits show inbreeding depression, but also reveals trait-specific differences in the ability of pedigrees and molecular markers to explain fitness variation and suggests that for certain traits, genetic markers may capture variation in realized IBDg above and beyond the pedigree expectation.
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Affiliation(s)
- David A Wells
- Department of Animal Behaviour, University of Bielefeld, Bielefeld, Germany.,School of Natural Science and Psychology, Liverpool John Moores University, Liverpool, UK
| | - Michael A Cant
- College of Life and Environmental Sciences, University of Exeter, Penryn, UK
| | - Hazel J Nichols
- School of Natural Science and Psychology, Liverpool John Moores University, Liverpool, UK
| | - Joseph I Hoffman
- Department of Animal Behaviour, University of Bielefeld, Bielefeld, Germany
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7
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Ihle KE, Hutter P, Tschirren B. Increased prenatal maternal investment reduces inbreeding depression in offspring. Proc Biol Sci 2017; 284:rspb.2017.1347. [PMID: 28794224 DOI: 10.1098/rspb.2017.1347] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 07/05/2017] [Indexed: 11/12/2022] Open
Abstract
Inbreeding depression refers to the reduction of fitness that results from matings between relatives. Evidence for reduced fitness in inbred individuals is widespread, but the strength of inbreeding depression varies widely both within and among taxa. Environmental conditions can mediate this variation in the strength of inbreeding depression, with environmental stress exacerbating the negative consequences of inbreeding. Parents can modify the environment experienced by offspring, and have thus the potential to mitigate the negative consequences of inbreeding. While such parental effects have recently been demonstrated during the postnatal period, the role of prenatal parental effects in influencing the expression of inbreeding depression remains unexplored. To address this gap, we performed matings between full-sibs or unrelated individuals in replicated lines of Japanese quail (Coturnix japonica) experimentally selected for high and low maternal egg provisioning. We show that in the low maternal investment lines hatching success was strongly reduced when parents were related. In the high maternal investment lines, however, this negative effect of inbreeding on hatching success was absent, demonstrating that prenatal maternal provisioning can alleviate the negative fitness consequences of inbreeding.
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Affiliation(s)
- Kate E Ihle
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Pascale Hutter
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Barbara Tschirren
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall TR10 9FE, UK
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