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Egg production and abundance of copepods in the North Sea, Summer 1991

Flameling, I.A. (1991) Egg production and abundance of copepods in the North Sea, Summer 1991. Master's Thesis / Essay, Biology.

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Egg production ofthe calanoid copepod species Temora/ongicornis, Centropages hamatus and Acartia c/ausi was measured in the Marsdiep in the season of 1991 by 24 h incubation of mature females. Egg production of T.Iongicornis increased from about 5 eggs per female per dav in the beg inning of March to 50 in April, and then decreased to about 15 in May-July. It showed a significant positive correlation to chlorophyll-a concentration. Egg production of the other 2 species was only measured in June and July, and fluctuated between 10 and 60 eggs. Some experiments at 15°C showed a rather constant rate of egg laying over one 24 h period, but egg production seemed to stop after 24 hours. Data on the abundance of 11 copepod species and on the egg production of 7 of these species were collected during a North Sea cruise in August of the same year. Adults of T.Iongicornis, A.clausi and Pseudocalanus elongatus were most abundant, and occurred especially in areas not deeper than 50 m. Other neritic, but less abundant species were Centropages hamatus and Isias clavipes. Centropages typicus, Calanus finmarchicus and Anomalocera patersoni we re virtually absent in the Southern Bight. Oithona similis and Meltridia lucens were mostly found north of 56 o N. Calanus helgolandicus, sparsely occurring in all areas, was seldomly caught together with C.finmarchicus. Egg production of T.Iongicornis, A.clausi, and C.finmarchicus was generally low; mean values for C.hamatus and C.typicus were higher. Fluorescence shows a significant positive correlation to egg production of the 3 smallest, neritic species. Egg production of C.helgolandicus and A.patersoni was rather constant during 24 hours of incubation at 15°C, and showed no diurnal rythm. The results are compared to literature data.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Biology
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:47
Last Modified: 15 Feb 2018 07:47

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