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clh@akvaplan.niva.no
Akvaplan-niva AS

Year: 2019
Project manager: Halsband, Claudia
Project code: 112018

The project will continue in its second year in 2019. Data on the temporal and spatial reproductive patterns of the important marine copepod Calanus finmarchicus have been collected along the northern Norwegian coast in year 1. Information on the timing and small-scale spatial variability of reproduction and recruitment in large Calanus patches will facilitate predictions of potential shifts
in recruitment phenology with climate warming. Alterations in reproductive output and/or timing of the peak occurrence of early life stages may affect the ecosystem services Calanus populations provide, especially essential food for the larvae of commercial fish species such as herring and cod.
To measure reproductive output in Calanus we apply two methods: 1) live incubations of females during two cruises and 2) estimates of potential spawning rates from gonad stage analysis in preserved females. The resulting data will complement stock size analyses and Calanus population
stage indexing in the NFR-funded project SeaPatches. In turn, GONAD will benefit from a wealth of physical and biological data collected during SeaPatches to relate reproductive rates to the prevailing environmental conditions. The project will produce valuable and timely knowledge
about Calanus life history patterns that drive important fisheries in Norway.

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