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170 results for “inbreeding depression”
Data from: Heterosis is common and inbreeding depression absent in natural populations of Arabidopsis thaliana
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Inbreeding depression in a sexually selected weapon and the homologue in females
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Assessment of inbreeding depression on progeny of Afrocarpus gracilior
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Data from: Evaluating inbreeding and assessing the risk of outbreeding depression in genetic rescue of the endangered marsh fritillary (<em>Euphydryas aurinia</em>)
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Heterozygosity–fitness correlations reveal inbreeding depression in neonatal body size in a critically endangered rock iguana
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Inbreeding depression in male reproductive traits
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Data from: Apparent inbreeding preference despite inbreeding depression in the American crow
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Can age-related changes in parental care modulate inbreeding depression? A test using the burying beetle, Nicrophorus orbicollis
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Data from: Bottlenecks and inbreeding depression in autotetraploids
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Data from: Consistent scaling of inbreeding depression in space and time in a house sparrow metapopulation
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Data from: Predicting heterosis and inbreeding depression from population size and density to inform management efforts
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Limited inbreeding avoidance at the gamete level despite inbreeding depression in Atlantic salmon (Salmo salar)
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Inbreeding depression contributes to the maintenance of habitat segregation between closely related monkeyflower species
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Data and code from: Parasite-mediated inbreeding depression in wild red deer
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Data from: Inbreeding depression across multiple life history traits in a long-lived mammal
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Data from: The conservation value of small population remnants: variability in inbreeding depression and heterosis of a perennial herb, the narrow-leaved purple coneflower (Echinacea angustifolia)
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Data from: Measuring the effect of environmental stress on inbreeding depression alone obscures the relative importance of inbreeding-stress interactions on overall fitness in Callosobruchus maculatus
<p>Environmental stress can have a profound effect on inbreeding depression. Quantifying this effect is of particular importance in threatened populations, which are often simultaneously subject to both inbreeding and environmental stress. But while the prevalence of inbreeding-stress interactions is well known, the importance and broader applicability of such interactions in conservation are not clearly understood. We used seed beetles, Callosobruchus maculatus, as a model system to quantify how environmental stressors (here host quality and temperature stress) interact with inbreeding as measured by changes in the magnitude of8inbreeding depression, δ, as well as the relative importance of inbreeding-stress interactions to overall fitness. We found that while both environmental stressors caused substantial inbreeding-stress interactions as measured by change in δ, the relative importance of these interactions to overall survival was modest. This suggests that assessing inbreeding-stress interactions within the framework of δ alone may give an inaccurate representation of the relevance of interactions to population persistence. Furthermore, we found that the effect of environmental stress on fitness, but not inbreeding depression, varied strongly among populations. These results suggest that the outcomes of inbreeding-stress interactions are not easily generalized, an important consideration in conservation settings.</p>
Data from: Sibling competition does not magnify inbreeding depression in North American Arabidopsis lyrata
About half of all angiosperms have some form of molecular self-incompatibility to promote outcrossing. If self-incompatibility breaks down, inbreeding depression (δ) is the main barrier to the evolution of self-fertilization (selfing). If inbreeding depression is lower than 50% (δ<0.5), the inherent transmission advantage of selfers should drive the evolution of selfing. However, this does not always happen in practice. For example, despite frequent breakdowns of self-incompatibility in North American Arabidopsis lyrata, selfing has only evolved in few populations. This is surprising given that previous inbreeding-depression estimates were well below the 0.5 threshold. Here, we test whether this could be due to underestimation of true inbreeding depression in competition-free environments. Specifically, we tested whether direct competition between crossed and selfed siblings magnified inbreeding-depression estimates in A. lyrata. We found that this was neither the case for below-, nor for aboveground biomass. For reproductive traits, there was hardly any significant inbreeding depression regardless of competition. Combined with previous findings that drought stress and inducing defense also did not magnify inbreeding depression, our results suggest that the relatively low estimates of inbreeding depression for biomass are indeed realistic estimates of the true inbreeding depression in North American A. lyrata.
Data from: How depressed? Estimates of inbreeding effects during seed development depend on reproductive conditions
Inbreeding depression can reduce the performance of offspring produced by mating between relatives, with consequences for population dynamics and sexual-system evolution. In flowering plants, inbreeding depression commonly acts most intensely during seed development. This predispersal component is typically estimated by comparing seed production following exclusive self- and cross-pollination, but such estimates are unbiased only if seed production is limited by ovule availability, rather than by pollen receipt or seed-development resources. To overcome this problem, we propose experimental and statistical methods based on a model of ovule fertilization and seed development that accounts for differential fertilization by self- and cross-pollen, limited ovule viability or receptivity, differential survival of self- and cross-zygotes and limited resource availability. Simulations illustrate that the proposed methods eliminate bias in estimated predispersal inbreeding depression caused by pollen limitation and can improve estimates under resource limitation. Application of these methods to two orchid species further demonstrates their utility in identifying and estimating diverse influences on reproductive performance under typical conditions. Although our theoretical results raise questions about the reported intensity of predispersal inbreeding depression, our proposed methods guard against bias while also providing insight into plant reproduction.
Data from: A comparison of pedigree- and genetic-based measures for identifying inbreeding depression in the critically endangered Attwater's Prairie-chicken
The primary goal of captive breeding programs for endangered species is to prevent extinction, a component of which includes the preservation of genetic diversity and avoidance of inbreeding. This is typically accomplished by minimizing mean kinship in the population, thereby maintaining equal representation of the genetic founders used to initiate the captive population. If errors in the pedigree do exist, such an approach becomes less effective for minimizing inbreeding depression. In this study both pedigree- and DNA-based methods were used to assess whether inbreeding depression existed in the captive population of the critically endangered Attwater's Prairie-chicken (Tympanuchus cupido attwateri), a subspecies of prairie grouse that has experienced a significant decline in abundance and concurrent reduction of neutral genetic diversity. When examining the captive population for signs of inbreeding, variation in pedigree-based inbreeding coefficients (f_pedigree) was less than that obtained from DNA-based methods (f_DNA). Mortality of chicks and adults in captivity were also positively correlated with parental relatedness (r_DNA) and f_DNA, respectively, while no correlation was observed with pedigree-based measures when controlling for additional variables such as age, breeding facility, gender, and captive/release status. Further, individual homozygosity by loci (HL) and parental r_DNA values were positively correlated with adult mortality in captivity and the occurrence of a lethal congenital defect in chicks, respectively, suggesting that inbreeding may be a contributing factor increasing the frequency of this condition among Attwater's Prairie-chickens. This study highlights the importance of using DNA-based methods to better inform management decisions when pedigrees are incomplete or errors may exist due to uncertainty in pairings.
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