Population genetics and the effects of a severe bottleneck in an ex situ population of critically endangered Hawaiian tree snails

dc.contributor.author Price, Melissa R.
dc.contributor.author Hadfield, Michael G.
dc.date.accessioned 2020-03-18T21:49:26Z
dc.date.available 2020-03-18T21:49:26Z
dc.date.issued 2014
dc.description.abstract As wild populations decline, ex situ propagation provides a potential bank of genetic diversity and a hedge against extinction. These programs are unlikely to succeed if captive populations do not recover from the severe bottleneck imposed when they are founded with a limited number of individuals from remnant populations. In small captive populations allelic richness may be lost due to genetic drift, leading to a decline in fitness. Wild populations of the Hawaiian tree snail Achatinella lila,a hermaphroditic snail with a long life history, have declined precipitously due to introduced predators and other human impacts. A captive population initially thrived after its founding with seven snails, exceeding 600 captive individuals in 2009, but drastically declined in the last five years. Measures of fitness were examined from 2,018 captive snails that died between 1998 and 2012, and compared with genotypic data for six microsatellite loci from a subset of these deceased snails (N5335), as well as live captive snails (N5198) and wild snails (N592). Surprisingly, the inbreeding coefficient (Fis) declined over time in the captive population, and is now approaching values observed in the 2013 wild population, despite a significant decrease in allelic richness. However, adult annual survival and fecundity significantly declined in the second generation. These measures of fitness were positively correlated with heterozygosity. Snails with higher measures of heterozygosity had more offspring, and third generation offspring with higher measures of heterozygosity were more likely to reach maturity. These results highlight the importance of maintaining genetic diversity in captive populations, particularly those initiated with a small number of individuals from wild remnant populations. Genetic rescue may allow for an increase in genetic diversity in the captive population, as measures of heterozygosity and rarified allelic richness were higher in wild tree snails. en_US
dc.format.extent 16 en_US
dc.identifier.citation Price, M. R. and M. G. Hadfield (2014) Population genetics and the effects of a severe bottleneck in an ex situ population of critically endangered Hawaiian tree snails. PLoS ONE 9(12): e114377. en_US
dc.identifier.doi DOI: 10.1371/journal.pone.0114377
dc.identifier.uri http://hdl.handle.net/10125/66570
dc.language.iso en-US en_US
dc.subject Inbreeding en_US
dc.subject captive rearing en_US
dc.subject Wildlife conservation en_US
dc.subject demographics en_US
dc.subject Mollusks en_US
dc.subject Pacific Islands en_US
dc.subject founder effect en_US
dc.subject life history en_US
dc.title Population genetics and the effects of a severe bottleneck in an ex situ population of critically endangered Hawaiian tree snails en_US
dc.type Papers en_US
dc.type.dcmi Text en_US
prism.number 12 en_US
prism.publicationname PLoS ONE en_US
prism.volume 9 en_US
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