Skip to main content

Seasonal changes in the reproduction of three oncaeid copepods in the surface layer of the Kuroshio Extension

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

Abstract

Seasonal changes in reproduction rates of three dominant oncaeids, Oncaea media, O. venusta f. venella and O. venusta f. –1, and effects of environmental factors on them were examined in the surface layer (0–30 m) in the Kuroshio Extension and adjacent waters off the Pacific coast of central Japan. The biomass of oncaeid copepods peaked in spring, and remained at about 14% of total copepod biomass throughout the year. Monthly mean specific egg production rates of O. media, O. venusta f. –1 and O. venusta f. venella ranged from 0 to 0.038 day−1, from 0.026 to 0.051 day−1 and from 0.022 to 0.049 day−1, respectively, and were relatively higher from winter to spring. Specific egg production rates of both O. media and O. venusta f. venella were positively related to primary production in the euphotic layer. Analysis of temperature effects on reproduction parameters indicated that low temperature was one cause for high specific egg production rates of O. venusta f. –1 in winter, mainly because of an increase in clutch size. Environmental factors thus affect reproduction of the dominant oncaeids in the surface layer of the Kuroshio Extension, and an increase in temperature and decline in primary production would reduce their reproduction.

Keywords: Kuroshio Extension; environmental factors; oncaeid copepods; reproduction

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1365-2419.2004.00316.x

Affiliations: 1: Suidosya Co. Ltd., 8-11-11 Ikuta, Tama, Kawasaki 214-0038, Japan 2: National Research Institute of Fisheries Science, 2-12-4, Fukuura, Kanazawa-ku, Yokohama 236-8648, Japan

Publication date: December 1, 2004

bsc/fog/2004/00000013/A00101s1/art00003
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more