open access

https://hdl.handle.net/2115/34756

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

英語

population

2007-09

日本動物学会

Zoological Science

24(9)

890-893

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.

学術雑誌論文

Version of Record

0289-0003

AA10545874