Inbreeding depression under intraspecific competition in a highly outcrossing population of <i>Crepis sancta</i> (Asteraceae): evidence for frequency‐dependent variation

Cheptou, Pierre‐Olivier; Lepart, Jacques; Escarré, José

doi:10.2307/3558449

Cited by 38 publications

(29 citation statements)

References 31 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both results are consistent with a magnifying effect on ID in harsh environmental conditions similar to that observed for other taxa (Latter and Mulley, 1995;Haag et al, 2002). In plants, Cheptou et al (2001) found that ID on survival was greatest when inbred plants compete with outbred plants. However, as reviewed by Keller and Waller (2002), ID is not universally higher in stressful environments, suggesting that generalisation should be avoided.…”

Section: Discussionsupporting

confidence: 88%

Environmental dependence of inbreeding depression in cultured Coho salmon (Oncorhynchus kisutch): aggressiveness, dominance and intraspecific competition

Neira

2005

Heredity

View full text Add to dashboard Cite

We evaluated the effects of inbreeding on traits related to territorial dominance and tested whether the magnitude of inbreeding depression (ID) was modified by social environment in Coho salmon. Evaluation of behaviour in paired contests between juvenile salmon with different inbreeding (low, LI ¼ 9.5%; medium, MI ¼ 29.6%), did not show significant differences between their capacities for establishing territorial dominance (mean aggressiveness score, LI ¼ 20.0722; MI ¼ 16.7723 or for feeding attempts, LI ¼ 18.3712; MI ¼ 21.1712). However, fish with low inbreeding (LI) showed almost twice the aggressive pursuit of fish with medium inbreeding (MI), and had a higher specific growth rate (SGR) in culture (SGR MI ¼ 1.8370.58; SGR LI ¼ 2.2070.67). Additionally, we found evidence that the magnitude of ID was modified by social environment: (1)Masking: In small groups of fish (N ¼ 20), large dominant fish of MI, cultivated with small subordinate fish of LI, showed the same SGR as dominant fish of LI cultivated with small subordinate fish of MI. (2) Magnifying: A significant effect of ID on juvenile survival was detected only in high-density competitive environments. Thus, the number of lethal equivalents was 2.70 at high-density, and only 0.24 in a low-density environment. Our results show that differences in size associated with territorial dominance may mask deleterious effects of inbreeding under certain conditions, and support the concept that intraspecific competition usually magnifies the deleterious effects of inbreeding. Heredity (2005) 95, 449-456.

show abstract

Section: Discussionsupporting

confidence: 88%

Environmental dependence of inbreeding depression in cultured Coho salmon (Oncorhynchus kisutch): aggressiveness, dominance and intraspecific competition

Neira

2005

Heredity

View full text Add to dashboard Cite

show abstract

“…This could imply that the loss in competition depends more so on the type of competitor, than on how strong the level of competition is. This is comparable to findings in plants; the negative effects of inbreeding are most noticeable when inbred plants are competing directly with outbred plants (Cheptou et al., ; Koelewijn, ). Moreover, Cheptou et al.…”

Section: Discussionsupporting

confidence: 84%

“…Moreover, Cheptou et al. () found that the type of competitor (inbred or outbred plant) was even more important for inbreeding depression than the number of competitors. If we can indeed extrapolate these findings in plants to our findings in birds, and inbred birds lose when they compete with outbred birds regardless of (dis)advantageous conditions, this would be an important factor to consider in the future (vertebrate) animal studies.…”

Section: Discussionmentioning

confidence: 99%

A loss of heterozygosity, a loss in competition? The effects of inbreeding, pre‐ and postnatal conditions on nestling development

Boer

Eens

Müller

2016

Ecology and Evolution

View full text Add to dashboard Cite

The early developmental trajectory is affected by genetic and environmental factors that co‐depend and interact often in a complex way. In order to distinguish their respective roles, we used canaries (Serinus canaria) of different genetic backgrounds (inbred and outbred birds). An artificial size hierarchy was created to provoke within‐nest competition, manipulating postnatal conditions. To this end, inbred birds were weight‐matched with outbred birds into duos, and each nest contained one duo of size‐advantaged, and one duo of size‐disadvantaged inbred and outbred nestlings. Prenatal (maternal) effects were taken into account also, enabling us to study the separate as well as the interactive effects of inbreeding, pre‐ and postnatal conditions on nestling development. We find that postnatal conditions were the most important determinant of early growth, with size‐advantaged nestlings growing faster and obtaining larger size/body mass at fledging in comparison with size‐disadvantaged nestlings. Prenatal conditions were important too, with birds that hatched from eggs that were laid late in the laying order obtaining a larger size at fledging than those hatched from early laid eggs. Inbreeding inhibited growth, but surprisingly this did not depend on (dis)advantageous pre‐ or postnatal conditions. Our findings imply that inbred individuals lose when they are in direct competition with same‐sized outbred individuals regardless of the rearing conditions, and we thus propose that reduced competitiveness is one of the driving forces of inbreeding depression.

show abstract

“…This might, in turn, alleviate inbreeding depression (Cheptou & Donohue ; but see Willi, Dietrich & van Kleunen ). Although empirical studies on plants show that reduced intraspecific competition can weaken inbreeding depression (Schmitt & Ehrhardt ; Wolfe ; Pujol & McKey ) others have not detected this effect (Eckert & Barrett ; Cheptou, Lepart & Escarré ) or found it to be inconsistent (Van Treuren et al . ).…”

Section: Evolution Of the Mating System Across Geographic Ranges As Pmentioning

confidence: 99%

Evolution of dispersal and mating systems along geographic gradients: implications for shifting ranges

2013

View full text Add to dashboard Cite

Summary1. Dispersal affects species' ability to move or adapt in response to environmental change. Successful long-distance dispersal also requires reproduction in areas with few mates, thus mating systems, especially the capacity for self-fertilization, may influence the speed and success of range shifts. 2. Here, we review: the theoretical predictions regarding dispersal and mating-system evolution at equilibrium, expanding and contracting range limits; the empirical support for these predictions; and how these geographic patterns may influence future range evolution. 3. Equilibrium range limits can arise from environmental gradients in habitat quality, temporal variation or habitat heterogeneity. Dispersal has been predicted to increase or decrease towards range edges, depending on which life-history traits respond to the ecological gradient(s). In general, spatial habitat isolation selects against dispersal, whereas temporal stochasticity favours dispersal. 4. At expanding range fronts, dispersal should increase due to spatial sorting for dispersive individuals and the benefits of colonizing vacant habitat. Dispersal evolution is likely more constrained during native range shifts than invasions. Models of expansion across environmental gradients and during climate-tracking range shifts are lacking. 5. Little theory considers evolution at contracting range margins. We suggest that increased dispersal should be selected if there is local adaptation to climate, as dispersers from warmer areas will out-compete nondispersers no longer adapted to new climatic conditions. Dispersal increases should be more pronounced in regions where local adaptation is stronger. 6. Self fertilization may be favoured at equilibrium, expanding or contracting range margins by providing reproductive assurance. However, this benefit depends on how inbreeding depression is influenced by genetic load, the severity of the abiotic environment, and the competitive milieu in edge populations. Models for the joint evolution of mating and dispersal in plants suggest that although selfing may evolve at range limits, it will not necessarily be associated with high dispersal. 7. Empirical evidence to test these predictions is scarce. Geographic surveys of dispersal traits, mating-system traits and relevant selective factors are needed, especially studies of: (i) stable range limits that identify underlying environmental gradients; (ii) moving range limits that compare traits across space and time; and (iii) contracting limits that assess variation in local adaptation towards the range edge.

show abstract

Inbreeding depression under intraspecific competition in a highly outcrossing population of Crepis sancta (Asteraceae): evidence for frequency‐dependent variation

Cited by 38 publications

References 31 publications

Environmental dependence of inbreeding depression in cultured Coho salmon (Oncorhynchus kisutch): aggressiveness, dominance and intraspecific competition

Environmental dependence of inbreeding depression in cultured Coho salmon (Oncorhynchus kisutch): aggressiveness, dominance and intraspecific competition

A loss of heterozygosity, a loss in competition? The effects of inbreeding, pre‐ and postnatal conditions on nestling development

Evolution of dispersal and mating systems along geographic gradients: implications for shifting ranges

Contact Info

Product

Resources

About