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Calanus populations spawn during Norwegian Sea spring bloom

Experiments from 79 coastal and open ocean stations in the Norwegian Sea demonstrate the peak in Calanus finmarchicus egg production rates during the phytoplankton bloom.

A joint basin-scale surveys in April–June 2003 in the Norwegian Sea performed vertical net hauls 200 to 0m with a 56-cm WP 2 net (mesh size 180 microns). Stevenik et al incubated up to 20 females each in a 400 ml volume of filtered seawater (60 microns), per station, to demonstrate the Ivlev curve correlation between individual egg production rate and integrated Chl a in the top 30 meters (see Fig.; Rsq = 0.24, p< 0.05).

The correlation to with in situ temperature is much noisier, although above 5 deg C higher individual egg production rates were observed. The population egg production rates were also calculated as eggs m-2 d-1 and are shown to be significantly higher in bloom water (on average 220 742 eggs m-2 day-1) than in pre-bloom (on average 146 926 eggs m-2 day-1) and post-bloom waters (on average 66 017 eggs m-2 day-1).

The dataset is just one of several recently published experimental datasets on copepod egg production rates to be included into the EUR-OCEANS Vital Rates Database (Carotenuto et al., 2006; Hirst & Lopez-Urrutia, 2007; Ianora et al., 2007). The aim of the Vital Rates Database is to provide easy access of vital rates data for species of key interest to ocean ecosystem modelers. To flag other datasets or include your own contributions into the database contact, take a look at the project website http://www.eur-oceans.eu/vital_rates.

References:
Stenevik, E.K.
*, et al., 2007. Egg production of Calanus finmarchicus—A basin-scale study. Deep-Sea Research II (2007), doi:10.1016/j.dsr2.2007.08.027
*EUROCEANS Assistant

RELEVANT LINKS:
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EUR-OCEANS Vital Rates Database
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Copepod datasets targeted and included in the Vital Rates Database



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