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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
Peer-reviewed Journal Articles, etc >
BODY LENGTH, DRY AND ASH-FREE DRY WEIGHTS, AND DEVELOPMENTAL CHANGES AT EACH COPEPODID STAGE IN FIVE SYMPATRIC MESOPELAGIC AETIDEID COPEPODS IN THE WESTERN ARCTIC OCEAN
| Title: | BODY LENGTH, DRY AND ASH-FREE DRY WEIGHTS, AND DEVELOPMENTAL CHANGES AT EACH COPEPODID STAGE IN FIVE SYMPATRIC MESOPELAGIC AETIDEID COPEPODS IN THE WESTERN ARCTIC OCEAN |
| Authors: | Koguchi, Yunosuke Browse this author | | Tokuhiro, Koki Browse this author | | Ashjian, Carin J. Browse this author | | Campbell, Robert G. Browse this author | | Yamaguchi, Atsushi Browse this author →KAKEN DB |
| Keywords: | Aetideidae | | mesopelagic copepods | | moult increment | | organic contents | | prosome length |
| Issue Date: | Feb-2023 |
| Publisher: | Brill |
| Journal Title: | Crustaceana |
| Volume: | 96 |
| Issue: | 2 |
| Start Page: | 113 |
| End Page: | 129 |
| Publisher DOI: | 10.1163/15685403-bja10272 |
| Abstract: | Aetideid copepods dominate the mesopelagic layer of the Arctic Ocean and play an important role in the vertical material flux and biodiversity. However, little information about the lengths and weights of their copepodids is available. In this study, we collected five sympatric aetideid copepods, Chiridius obtusifrons Sars G.O., 1902, Gaetanus tenuispinus (Sars G.O., 1900), Gaetanus brevispinus (Sars G.O., 1900), Aetideopsis multiserrata (Wolfenden, 1904), and Aetideopsis rostrata Sars G.O., 1903, from the Arctic Ocean and examined their body lengths, dry and ash-free dry weights, and developmental growths at each copepodid stage. Highly significant length-weight relationships were obtained among copepodids for all species. Within genera, individuals of the same length were heavier at shallower depths. This may result from the greater nutritional availability to species within genera inhabiting shallower depths. Common to all species, the organic content (ash -free dry weight per dry weight) was high for the early copepodid stages. This may be due to the residual organic content of lipid-rich eggs retained in the non-feeding nauplii. The largest growth in females occurred at C5/C6, whereas the largest growth in males occurred at C4/C5, as determined by moult increment and proportion of growth in weight. These sex differences in weight growth could be due to the degeneration of the feeding appendage and cessation of feeding in C6 males of aetideid copepods. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/91295 |
| Appears in Collections: | 水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山口 篤
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