© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
Life-history strategies of calanoid congeners under two different climate regimes: a comparison
a Alfred Wegener Institute for Polar and Marine Research Postfach 120161, DE-27515 Bremerhaven, Germany
b Laboratoire d'Océanographie Biologique 2 rue du Prof. Jolyet, F-33120 Arcachon, France
c DZMB, Senckenberg Research Institute Notkestrasse 85, D-22607 Hamburg, Germany
*Correspondence to C. Halsband-Lenk: tel: +1 206 543 3469; fax: +1 206 543 0275. e-mail: halsband{at}ocean.washington.edu.
To evaluate the relationship between different environmental temperature regimes and life-history traits of key planktonic taxa, the life cycles of congener pairs of Temora and Centropages species at two sites, a cold-temperate shelf sea (Helgoland Island, North Sea) and a warm-temperate oceanic site (Bay of Villefranche, Mediterranean) were compared in a multi-annual time-series. In an attempt to assemble a variety of parameters – some detailed, others sporadically measured – a synthesis of the life cycle is presented for each population. Although closely related, congeners showed distinct temperature preferences and specific adaptations of their life cycles to temperature regime. On the other hand, co-existing species such as T. longicornis and C. hamatus in the North Sea showed some analogous life-history traits. C. typicus occupied an intermediate position and was able to tolerate both temperature regimes by shifting its reproductive period between seasons. We point out interannual and inter-site variability in the populations investigated and identify the unsolved questions in regard to the seasonal dynamics of these species that require verification.
Keywords: Centropages, life cycle, reproduction, Temora, temperature regime
1 Present address: School of Oceanography, University of Washington, PO Box 357940, Seattle, WA 98195-7940, USA.
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