Fluctuating asymmetry in the insular population of ayu, Plecoglossus altivelis ryukyuensis, estimating its genetic diversity at extinction

The present study tested the hypothesis that whether limited genetic diversity was the main factor that led the Ryukyu-ayu population on Okinawa-jima Island to extinction in the late 1970s. The usability of fluctuating asymmetry (FA) in reflecting genetic diversity was tested using two extant popula...

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Bibliographic Details
Published in:Ichthyological research 2022-07, Vol.69 (3), p.381-386
Main Authors: Ha, Linh Manh, Oka, Shin-ichiro, Iguchi, Kei’ichiro
Format: Article
Language:English
Subjects:
Animal Systematics/Taxonomy/Biogeography
Biomedical and Life Sciences
Ecology
Fluctuating asymmetry
Freshwater & Marine Ecology
Genetic diversity
Genetic variation
Life Sciences
Short Report
Species extinction
Zoology
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Summary:The present study tested the hypothesis that whether limited genetic diversity was the main factor that led the Ryukyu-ayu population on Okinawa-jima Island to extinction in the late 1970s. The usability of fluctuating asymmetry (FA) in reflecting genetic diversity was tested using two extant populations of Ryukyu-ayu on Amami-oshima Island, then used to estimate genetic diversity for the extinct population which only formalin-preserved specimens are available. The results showed that higher FA indices were associated with lower genetic diversity in the two extant populations, and the extinct population on Okinawa-jima Island had lower FA indices than the two extant populations on Amami-oshima Island. This finding suggests that the genetic diversity of the extinct population was not low enough as to cause its extinction.
ISSN:1341-8998
1616-3915
DOI:10.1007/s10228-021-00840-3