Strathprints logo
Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Overwintering strategies in calanus finmarchicus

Hind, A.T. and Gurney, W.S.C. and Heath, M. and Bryant, A.D. (2000) Overwintering strategies in calanus finmarchicus. Marine Ecology Progress Series, 193. pp. 95-107. ISSN 0171-8630

[img] PDF (strathprint17499.pdf)
Restricted to Registered users only

Download (1591Kb) | Request a copy from the Strathclyde author

    Abstract

    The marine copepod Calanus finmarchicus is known to overwinter at depth in a state analogous to diapause in terrestrial insects, but the cues which cause individuals to enter and leave this state are the subject of speculation. In this paper we use a simple demographic model, driven by environmental data from 4 distinct locations in the organism's eastern range, to test the plausibility of a number of candidate mechanisms. We start from Miller et al.'s (1991; Mar Ecol Prog Ser 72:79-91) hypothesis that diapause is controlled by photoperiod, and show that thls leads to unrealistic patterns of reproductive activity in northern waters. We extend the model to include the recently reported phenomenon (Hirche 1996a; Ophelia 44:lll-128) of delayed gonad maturation in females experiencing low food concentrations. This ylelds more plausible annual patterns, but falls to reproduce observed geographical variation in the timing of the yearly onset of reproductive activity. Our final model dispenses with photoperiodic control and assumes that diapause duration is controlled by the normal development processes operating at a reduced rate. This model reproduces all the qualitative features of the patterns of reproductive activity observed at our 4 test sites, thus demonstrating that photoperiod cueing is not a necessary prerequisite for the regular re-ascension of C. finmarchicus into surface waters

    Item type: Article
    ID code: 17499
    Keywords: calanus, diapause, overwintering, life-cycle modelling, Aquaculture. Fisheries. Angling, Statistics, Ecology, Ecology, Evolution, Behavior and Systematics, Aquatic Science
    Subjects: Agriculture > Aquaculture. Fisheries. Angling
    Social Sciences > Statistics
    Department: Faculty of Science > Mathematics and Statistics
    Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 13 May 2010 15:31
    Last modified: 07 Sep 2014 18:55
    URI: http://strathprints.strath.ac.uk/id/eprint/17499

    Actions (login required)

    View Item

    Fulltext Downloads: