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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第69巻 第2号 >

初夏のオホーツク海における深海におよぶ優占大型カイアシ類の鉛直分布および個体群構造

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/bull.fish.69.2.83

Title: 初夏のオホーツク海における深海におよぶ優占大型カイアシ類の鉛直分布および個体群構造
Other Titles: Vertical distribution and population structure of large dominant planktonic copepods down to greater depths in the Okhotsk Sea during early summer
Authors: 柊, 萌乃1 Browse this author
山口, 篤2 Browse this author →KAKEN DB
Authors(alt): Hiragi, Moeno1
Yamaguchi, Atsushi2
Keywords: Calanoid copepods
Neocalanus
Eucalanus
Metridia
Paraeuchaeta
Heterorhabdus
Heterostylites
Sex ratio
Lipid accumulation
Gonad maturation
Issue Date: 9-Dec-2019
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: 69
Issue: 2
Start Page: 83
End Page: 91
Abstract: Vertical distribution and population structure of large dominant planktonic copepods (Neocalanus cristatus, N. flemingeri, N. plumchrus, Eucalanus bungii, Metridia okhotensis, M. pacifica, Paraeuchaeta elongata, P. birostrata, P. rubra, Heterorhabdus tanneri, and Heterostylites major) were studied down to greater depths in the Okhotsk Sea during early summer. For suspensionfeeders (Neocalanus spp., Eucalanus bungii, and Metridia spp.), their vertical distributions were well separated within 0-250m depths. For carnivores (Paraeuchaeta spp. and Heterorhabdidae), vertical partitioning within the genus and family was also the cases throughout the 0-3,000 m water column. The vertical partitioning within the same feeding pattern copepods may have a function to reduce competition on similar food items. Population structures of the most suspension feeders were dominated by middle- to late-copepodids with low-lipid accumulation. This may reflection of their life cycle seasonal phenomena. For most of the copepods treated in this study, the sex ratio was skewed for females. It caused by the degeneration of feeding appendages (Eucalanus bungii and Paraeuchaeta spp.) and the vertical distribution behaviors (Metridia spp. : stay deep-layer where food-limited throughout the day) of adult males. Since adult females may perform massive feeding in adult females, their body sizes were much larger than the males.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/76383
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第69巻 第2号

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