HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
Peer-reviewed Journal Articles, etc >

Short-term changes in population structure and vertical distribution of mesopelagic copepods during the spring phytoplankton bloom in the Oyashio region

Files in This Item:
74)Abe-2012.pdf827.18 kBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/57994

Title: Short-term changes in population structure and vertical distribution of mesopelagic copepods during the spring phytoplankton bloom in the Oyashio region
Authors: Abe, Yoshiyuki Browse this author
Ishii, Ken-ichiro Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Imai, Ichiro Browse this author →KAKEN DB
Keywords: Mesopelagic
Copepods
Population structure
Vertical distribution
Gut contents
Issue Date: Jul-2012
Publisher: ELSEVIER
Journal Title: Deep Sea Research Part I: Oceanographic Research Papers
Volume: 65
Start Page: 100
End Page: 112
Publisher DOI: 10.1016/j.dsr.2012.02.009
Abstract: To evaluate the responses to the spring phytoplankton bloom, short-term changes in population structure and vertical distribution of mesopelagic copepods (Gaetanus simplex, Gaidius variabilis, Pleuromamma scutullata, Paraeuchaeta elongata, P. birostrata, Heterorhabdus tanneri and Heterostylites major) were studied in the Oyashio region. Samples were collected with a 60 mu m mesh VMPS from 9 strata between 0 and 1000 m both day and night on five occasions during March-April 2007. All the species except Heterorhabdidae species performed reproduction during the spring phytoplankton bloom, while no recruitment to copepodid stages was detected because the newly born individuals were eggs or nauplii. The shallower-living species, G. simplex, P. scutullata and P. elongata had nocturnal ascent did l vertical migration (DVM). While suspension feeding copepods cease DVM after 11 April (P. scutullata) or 23 April (G. simplex), carnivorous P. elongata continued DVM over the study period. Since the gut contents of G. simplex showed a nocturnal increment even in the period of no DVM (23 and 29 April), they might be feeding at depth without DVM. Thus, the cessation of DVM in mesopelagic suspension feeding copepods would be induced by the increase of sinking particles (e.g. food for suspension feeders) during the spring phytoplankton bloom. (C) 2012 Elsevier Ltd. All rights reserved.
Type: article (author version)
URI: http://hdl.handle.net/2115/57994
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)

Submitter: 山口 篤

Export metadata:

OAI-PMH ( junii2 , jpcoar )

MathJax is now OFF:


 

 - Hokkaido University