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5 results for “sibship reconstruction”
Data from: Molecular sibship reconstruction reveals a promiscuous mating system in brood parasitic little bronze-cuckoos (Chalcites minutillus)
<p>In theory, emancipation from parental care is expected to favour promiscuous mating systems. However, in avian brood parasites monogamy is surprisingly widespread and it has been proposed that this may be favoured by factors such as low population density and territoriality. Correspondingly, our previous research revealed that brood parasitic Horsfield's bronze-cuckoos (<em>Chalcites basalis)</em>, which occur at low population densities and defend territories, are monogamous. Here, we contrast this study with the mating system of the congeneric little bronze-cuckoo (<em>C. minutillus)</em>, an obligate brood parasite that exploits more concentrated hosts and is therefore likely to occur at higher population densities. We use single nucleotide polymorphisms to characterise the reproductive patterns of unsampled adults by inferring sibling relationships among 30 offspring. We show that 1) little bronze-cuckoos occurred at high densities, 2) polygamy was the most common mating pattern found in this study in both sexes, and 3) where multiple cuckoo eggs are laid in the same nest, they were unrelated. These results indicate that females do not defend exclusive territories and males do not defend multiple females (polygyny). Instead, little bronze-cuckoos appear to have a non-territorial, promiscuous mating system. Our results are consistent with theoretical predictions that polygamy is more likely to evolve in species that are emancipated from parental care, where there are plenty of available mates and where home ranges are not defended.</p>
Data from: Molecular sibship reconstruction reveals a promiscuous mating system in brood parasitic little bronze-cuckoos (Chalcites minutillus)
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Data from: Estimation of bumblebee queen dispersal distances using sibship reconstruction method
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Sibship reconstruction with SNPs illuminates the scope of a cryptic invasion of Asian Swamp Eels (Monotperus albus) in Georgia, USA
<p>Cryptic invasive species are particularly problematic to study, manage, and control because of the difficulty detecting these species within their invaded habitats. Such is the case of the Asian Swamp Eel (<i>Monopterus albus</i>; ASE) where it is established in vegetated marshes along the Chattahoochee River, Georgia. Adult eels have been nearly impossible to detect or quantify with traditional sampling, although leaf-litter trapping of juvenile ASEs has been somewhat successful.In this study, we leveraged a collection of juveniles from the 2015 cohort and used single-nucleotide polymorphisms (SNPs) to reconstruct sibship among these juveniles in COLONY. Sibship reconstruction allowed us to learn about adult breeding behaviors and provided the first quantified estimates of breeder abundance. Pedigree reconstruction revealed that adults of both sexes were polygamous and likely traveled up to 0.5 km among marsh habitats during a single breeding season. Estimates of the number of breeding adults contributing to offspring (<i>N<sub>s</sub></i>) and the effective number of breeders (<i>N<sub>b</sub></i>) indicated an approximate minimum bound of 100 breeding adults in the marshes in 2015. Our study updated the invasion status of a cryptic population formerly riddled with uncertainty, highlighting that low captures of adult eels in the study area have been the result of low detectability, not low abundance. Given that low detectability would likely hinder removal efforts, our results suggest that future efforts could focus on suppression of ASE abundance when they are most vulnerable to capture and containing the spatial extent of the invasion.</p>
Sibship reconstruction with SNPs illuminates the scope of a cryptic invasion of Asian Swamp Eels (Monotperus albus) in Georgia, USA
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