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Comparative ecology of three dominant pelagic chaetognaths (Eukrohnia hamata, Parasagitta elegans, Pseudosagitta scrippsae) in the Oyashio region during the spring phytoplankton bloom

Citation

Abe, Y and Miyamoto, H and Saito, R and Matsuno, K and Yamaguchi, A and Imai, I, Comparative ecology of three dominant pelagic chaetognaths (Eukrohnia hamata, Parasagitta elegans, Pseudosagitta scrippsae) in the Oyashio region during the spring phytoplankton bloom, Regional Studies in Marine Science, 8, (Part 1) pp. 122-132. ISSN 2352-4855 (2016) [Refereed Article]

Copyright Statement

© 2016 Published by Elsevier B.V.

DOI: doi:10.1016/j.rsma.2016.08.006

Abstract

In the Oyashio region, the dominant water masses are switched at the surface layer within a short period during spring. Simultaneously, a large phytoplankton bloom is known to occur at the surface layer, and nearly half of the annual primary production is concentrated during spring. These drastic changes in the water mass and food condition are expected to strongly affect the macrozooplankton population dynamics. However, their effects on the chaetognath population remain unknown. To evaluate the effects of the water mass exchange and spring phytoplankton bloom, we analysed short-term changes in the population structure, growth rate, gut contents and predation impact of the three dominant chaetognaths (Eukrohnia hamata, Parasagitta elegansand Pseudosagitta scrippsae) in the Oyashio region during March–April 2007. Eleven samples were collected by a 0–200 m oblique tow of a Bongo net at night during 9 March to 30 April, 2007. The effects of the water mass exchange were significant for all three chaetognath species. During the sampling period, significant growth was observed for the two dominant species (E. hamata and P. elegans). The daily growth rate was 39–50 μm day −1 for E. hamata and 42–101 μm day −1for P. elegans. The mean predation impact of P. elegans at 0–200 m was 0.194 no. prey consumed m –3 day –1 and that of P. scrippsae was 0.028 no. prey consumed m −3 day −1. These values corresponded with 0–0.097% (P. elegans) or 0–0.043% (P. scrippsae) of the total zooplankton abundance during the spring.

Item Details

Item Type:Refereed Article
Keywords:spring bloom, Chaetognaths, water mass, growth rate, feeding
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Animal Systematics and Taxonomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Matsuno, K (Dr Kohei Matsuno)
ID Code:118831
Year Published:2016
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-07-20
Last Modified:2017-08-30
Downloads:0

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