Sensitive males: inbreeding depression in an endangered bird

Brekke, Patricia; Bennett, Peter M.; Wang, Jinliang; Pettorelli, Nathalie; Ewen, John G.

doi:10.1098/rspb.2010.1144

Cited by 60 publications

(65 citation statements)

References 53 publications

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“…A number of studies report stronger inbreeding depression in male than female reproductive success [18][19][20][21], and there are similar trends in lance-tailed manakins [33]. If females can alter the fitness outcome of mating with a related male via non-genetic maternal effects, this may explain why some systems (including this one) do not show inbreeding avoidance despite inbreeding depression.…”

Section: Discussionmentioning

confidence: 97%

“…A third study found female zebra finches (Taeniopygia guttata) produced smaller clutches and eggs with lower mass when closely related to their mate [26]. Indirect evidence from two further studies found inbreeding level was higher among male than female offspring [20,27]. It therefore remains widely untested whether females adjust offspring sex or egg size (a commonly used proxy of female investment in birds [4,28]) with respect to mate relatedness [13,26].…”

Section: Introductionmentioning

confidence: 99%

“…If outbred males have higher fitness than inbred males, and because mating success is more variable in males than females, females may gain higher fitness returns from producing male offspring when those offspring are likely to be outbred [3]. Several studies have identified stronger inbreeding depression in male sexual and life-history traits than in female traits [18][19][20][21]. Producing female offspring after inbreeding may therefore be less costly than producing male offspring.…”

Section: Introductionmentioning

confidence: 99%

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Differential allocation in a lekking bird: females lay larger eggs and are more likely to have male chicks when they mate with less related males

Sardell

2014

Proc. R. Soc. B.

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The differential allocation hypothesis predicts increased investment in offspring when females mate with high-quality males. Few studies have tested whether investment varies with mate relatedness, despite evidence that nonadditive gene action influences mate and offspring genetic quality. We tested whether female lekking lance-tailed manakins (Chiroxiphia lanceolata) adjust offspring sex and egg volume in response to mate attractiveness (annual reproductive success, ARS), heterozygosity and relatedness. Across 968 offspring, the probability of being male decreased with increasing parental relatedness but not father ARS or heterozygosity. This correlation tended to diminish with increasing lay-date. Across 162 offspring, egg volume correlated negatively with parental relatedness and varied with lay-date, but was unrelated to father ARS or heterozygosity. Offspring sex and egg size were unrelated to maternal age. Comparisons of maternal half-siblings in broods with no mortality produced similar results, indicating differential allocation rather than covariation between female quality and relatedness or sex-specific inbreeding depression in survival. As males suffer greater inbreeding depression, overproducing females after mating with related males may reduce fitness costs of inbreeding in a system with no inbreeding avoidance, while biasing the sex of outbred offspring towards males may maximize fitness via increased mating success of outbred sons.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Differential allocation in a lekking bird: females lay larger eggs and are more likely to have male chicks when they mate with less related males

Sardell

2014

Proc. R. Soc. B.

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“…Furthermore, studies of fertility and sex ratio require the ability to sex-type degraded tissue (e.g. unhatched eggs, Brekke et al 2010). However, allelic dropout can occur when attempting to PCR-amplify large products from degraded samples (Toouli et al 2000) and dropout causes errors in sex-typing (Robertson and Gemmell 2006).…”

Section: Introductionmentioning

confidence: 99%

A marker suitable for sex-typing birds from degraded samples

Dawson

Brekke

Remedios

et al. 2015

Conservation Genet Resour

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A new primer set was developed for sex-typing birds, Z37B. This primer set was designed to amplify alleles of small size to render it suitable for sex-typing degraded samples, including shed feathers. This marker successfully sex-typed 50 % of the species tested, including passerines, shorebirds, rails, seabirds, eagles and the brown kiwi Apteryx australis (allele size range =81-103 bp), and is therefore expected to be suitable for sex-typing a wide range of species. Z37B sex-typed nondegraded samples (blood), degraded tissue (dead unhatched embryos, dead nestlings and museum specimens) and samples of low quantity DNA (plucked feathers and buccal swabs). The small amplicon sizes in birds suggest that this marker will be of utility for sex-typing feathers, swabs and degraded samples from a wide range of avian species.

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“…In animals, this includes offspring survival and other parameters. Inbreeding effects have been extensively studied in wild populations (Keller and Waller 2002;Brekke et al 2010;Brzeski et al 2014). A review of the literature on inbreeding effects in wild vertebrates and plants found that 90% of 157 datasets showed inbreeding depression.…”

Section: Introductionmentioning

confidence: 99%

Inbreeding depression in the Lizard canary breed estimated by pedigree analysis

Cecchi¹,

Giacalone²,

Paci³

2016

CZECH J ANIM SCI

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ABSTRACT:The influence of inbreeding depression on phenotypic traits of the Lizard canary from an Italian breeder was evaluated. The following traits were studied: birds' life span, number of surviving offspring, and morphological traits (type of plumage, spangles, feather quality, breast, cap, ground colour, wings and tail, eyelashes, covert feathers, beak, legs and feet, habits, and size). The effects of inbreeding on genetic diseases and on the health of the breed were also considered. The inbreeding coefficient of each bird was computed by genealogical data. The distribution of inbreeding in the whole population was analyzed and eleven different inbreeding level classes were considered. Birds were also divided into healthy and unhealthy animals (animals with genetic abnormalities such as blindness, splay legs and cataracts, or genetic predispositions, such as feather cysts (lumps), or animals with slow growth and/or a slender structure). Despite the high levels of inbreeding in the population, the results showed that 80.47% of the birds were healthy and no significant differences were observed between healthy and unhealthy animals in terms of the degree of inbreeding. Evidence of inbreeding depression was observed in the number of surviving offspring and the life span, whereas phenotypic characters did not show any evidence of inbreeding depression.

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Sensitive males: inbreeding depression in an endangered bird

Cited by 60 publications

References 53 publications

Differential allocation in a lekking bird: females lay larger eggs and are more likely to have male chicks when they mate with less related males

Differential allocation in a lekking bird: females lay larger eggs and are more likely to have male chicks when they mate with less related males

A marker suitable for sex-typing birds from degraded samples

Inbreeding depression in the Lizard canary breed estimated by pedigree analysis

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