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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第62巻 第3号 >
Geographical variations in abundance and body size of the hydromedusa Aglantha digitale in the northern North Pacific and its adjacent seas
Title: | Geographical variations in abundance and body size of the hydromedusa Aglantha digitale in the northern North Pacific and its adjacent seas |
Authors: | Shiota, Tomoya Browse this author | Yamaguchi, Atsushi Browse this author →KAKEN DB | Saito, Rui Browse this author | Imai, Ichiro Browse this author →KAKEN DB |
Keywords: | Aglantha digitale | jellyfish | abundance | body size | geographical variation |
Issue Date: | 14-Dec-2012 |
Publisher: | 北海道大学大学院水産科学研究院 |
Journal Title: | 北海道大学水産科学研究彙報 |
Journal Title(alt): | Bulletin of Fisheries Sciences, Hokkaido University |
Volume: | 62 |
Issue: | 3 |
Start Page: | 63 |
End Page: | 69 |
Abstract: | Geographical variations in abundance and body size of the hydromedusa Aglantha digitale (O.F. Müller, 1766) were evaluated in the northern North Pacific (NP), the water around Aleutian Islands (AL), eastern Bering Sea shelf (BS) and Chukchi Sea (CH) during the summers of 2007 and 2008. Abundances of A. digitale ranged between 38 and 221 ind. m-2, and had significant inverse relationships with the proportion of mature individuals. While abundances showed large annual variability, body sizes had a common regional pattern both 2007 and 2008. Body size and minimum size of maturity A. digitale were smaller in the BS and CH than those in the NP and AL. The smaller size at maturity in the BS and CH suggests regional variations in the acquired energy budget. The rapid maturity and reproduction in the BS and CH may indicate that they utilize acquired energy to mature and reproduce from smaller body sizes, while slow maturity in the NP and AL may imply that they convert acquired energy to somatic growth first. |
Type: | bulletin (article) |
URI: | http://hdl.handle.net/2115/51114 |
Appears in Collections: | 北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第62巻 第3号
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