Non-random mating within an Island rookery of Hawaiian hawksbill turtles: demographic discontinuity at a small coastline scale

Hawksbill sea turtles ( Eretmochelys imbricata ) from the Hawaiian archipelago form a small and genetically isolated population, consisting of only a few tens of individuals breeding annually. Most females nest on the island of Hawai'i, but little is known about the demographics of this rookery...

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Vydáno v:Royal Society open science Ročník 10; číslo 5; s. 221547
Hlavní autoři: Horne, John B., Frey, Amy, Gaos, Alexander R., Martin, Summer, Dutton, Peter H.
Médium: Journal Article
Jazyk:angličtina
Vydáno: England The Royal Society 17.05.2023
Témata:
breeding sex ratios
conservation
Genetics and Genomics
inbreeding
nesting frequency
Pacific Islands
sea turtles
conservation
inbreeding
nesting frequency
Pacific Islands
breeding sex ratios
sea turtles
ISSN:2054-5703, 2054-5703
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Shrnutí:Hawksbill sea turtles ( Eretmochelys imbricata ) from the Hawaiian archipelago form a small and genetically isolated population, consisting of only a few tens of individuals breeding annually. Most females nest on the island of Hawai'i, but little is known about the demographics of this rookery. This study used genetic relatedness, inferred from 135 microhaplotype markers, to determine breeding sex-ratios, estimate female nesting frequency and assess relationships between individuals nesting on different beaches. Samples were collected during the 2017 nesting season and final data included 13 nesting females and 1002 unhatched embryos, salvaged from 41 nests, of which 13 had no observed mother. Results show that most females used a single nesting beach laying 1–5 nests each. From female and offspring alleles, the paternal genotypes of 12 breeding males were reconstructed and many showed high relatedness to their mates. Pairwise relatedness of offspring revealed one instance of polygyny but otherwise suggested a 1 : 1 breeding-sex ratio. Relatedness analysis and spatial-autocorrelation of genotypes indicate that turtles from different nesting areas do not regularly interbreed, suggesting that strong natal homing tendencies in both sexes result in non-random mating across the study area. Complexes of nearby nesting beaches also showed unique patterns of inbreeding across loci, further indicating that Hawaiian hawksbill turtles have demographically discontinuous nesting populations separated by only tens of km.
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Electronic supplementary material is available online at https://doi.org/10.6084/m9.figshare.c.6631187.
ISSN:2054-5703
2054-5703
DOI:10.1098/rsos.221547