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Survival of Glochidial Larvae of the Freshwater Pearl Mussel, Margaritifera laevis (Bivalvia: Unionoida), at Different Temperatures : A Comparison Between Two Populations With and Without Recruitment

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Title: Survival of Glochidial Larvae of the Freshwater Pearl Mussel, Margaritifera laevis (Bivalvia: Unionoida), at Different Temperatures : A Comparison Between Two Populations With and Without Recruitment
Authors: Akiyama, Yoshihiro Browse this author
Iwakuma, Toshio Browse this author
Keywords: glochidium
Margaritifera laevis
survival
temperature effect
population
Issue Date: Sep-2007
Publisher: 日本動物学会
Journal Title: Zoological Science
Volume: 24
Issue: 9
Start Page: 890
End Page: 893
Publisher DOI: 10.2108/zsj.24.890
PMID: 17960993
Abstract: The viability of free-living glochidia of the freshwater pearl mussel (Margaritifera laevis) was studied in the laboratory at water temperatures of 10℃, 15℃ and 20℃. To obtain glochidia, gravid female mussels were collected from the Chitose River, inhabited by adult and juvenile mussels, and from the Abira River, where only adult mussels were found. Daily survival rates of glochidia from each population at various water temperatures were significantly different, and survival time was longest at the lowest temperature in each population. Maintenance of some field mussel populations might become difficult at higher water temperatures due to the short survival time of glochidia and expected low density of host fish. Daily survival rates of glochidia were compared between the Abira population at 15℃ and the Chitose population at 20℃, since these temperatures were close to the mean water temperature during the period of glochidial release in the respective rivers. Daily mean survival rates were significantly different between the Abira population at 15℃ and the Chi¬tose population at 20℃. Mean glochidial survival rate for the Chitose population changed from 85.3% to 66.2% from 9 to13 h, whereas that for the Abira population dropped suddenly from 80.4% to 34.2% from 10 to 14 h after the initiation of experiment. Absence of juveniles in the Abira River might have been caused by the low glochidial viability. Survival times of free-living glochidia in Mar¬garitiferidae tend to be shorter than in other families in Unionoida. A trade-off is suggested between high fertility and low glochidial survival rate in Margaritiferidae.
Type: article
URI: http://hdl.handle.net/2115/34756
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 秋山 吉寛

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