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Seasonal occurrence and dominance of Centropages congeners in the Middle Atlantic Bight, USA
Grant, G.C. (1988). Seasonal occurrence and dominance of Centropages congeners in the Middle Atlantic Bight, USA, in: Boxshall, G.A. et al. (Ed.) Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47: pp. 227-237. hdl.handle.net/10.1007/978-94-009-3103-9_21
In: Boxshall, G.A.; Schminke, H.K. (Ed.) (1988). Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47. Kluwer Academic Publishers: Dordrecht. ISBN 90-6193-654-3. XII, 639 pp., more
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, more

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Keywords
    Seasonal distribution; Temperature effects; Centropages Krøyer, 1849 [WoRMS]; Marine
Author keywords
    Centropages; Dominance index; Interspecific association

Author  Top 
  • Grant, G.C.

Abstract
    The copepod fauna of Middle Atlantic Bight waters regularly includes four species of Centropages: C. typicus, C. hamatus, C. velificatus, and C. bradyi. Seasonal collections of copepods with coarse-meshed (0.5 mm) bongo and neuston nets were often dominated by one of these congeners. A fifth species, C. violaceus, occurs very rarely, presumably as an expatriate from the Gulf Stream. C. typicus was the dominant large copepod in most seasons, especially at midshelf, but was largely replaced by Calanus finmarchicus after a severely cold winter (1977). The other Centropages species were less abundant and widespread: C. hamatus dominated inshore collections during winter and spring of 1977; C. bradyi was restricted mostly to outer shelf stations and was never abundant; C. velificatus appeared more frequently in the southern Bight, where it dominated a few inner shelf neuston collections in summer and fall.

    Except for the dominant and year-round C. typicus, Centropages congeners within the Middle Atlantic Bight were variously separated, temporally and spatially. C. bradyi and C. hamatus were completely separated into depths >50 m and <50 m, respectively, in seasons when both were collected. The cold-water C. hamatus was largely separated by season from C. velificatus, the congener with preference for warm temperatures. Winter and spring occurrences of the latter were limited to offshore, southern stations, away from inshore abundances of C. hamatus. Since C. velificatus was abundant only at inshore locations, it was also typically separate from the offshore C. bradyi.


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