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Seasonal Abundance and Population Flux of Tigriopus Californicus (Copepoda: Harpacticoida) in Barkley Sound, British Columbia

Published online by Cambridge University Press:  11 May 2009

James J. Powlik
James J. Powlik
Affiliation:
University of British Columbia, Department of Oceanography, Vancouver, British Columbia, Canada.
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Extract

The study describes the seasonal density and age structure for splashpool metapopulations of Tigriopus californicus (Copepoda: Harpacticoida). Natural populations were highly variable, ranging from 217 ± 401·7 ind 1−1 in winter (mean ± SE) to 835 ± 1750·6 ind 1−1 in summer, with some populations approaching 20,000 ind 1−1 in all seasons except winter. Male-to-female ratio ranged from 1·36 in spring and summer to 1·84 in autumn, and reproduction was observed throughout the year. Nauplii abundance averaged 28 + 7·4 ind 11, a value much lower than expected for in situ copepod populations and possibly due to behavioural processes such as cannibalism and inhibition of egg deposition. The densest assemblages of splashpool microcrustacea were almost entirely T. californicus, principally mature adults and including clasped male-female pairs and ovigerous females. A simple population growth model is presented, along with parameters for calculating the instantaneous rate of increase, birth, and death in the absence of disturbance.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 78 , Issue 2 , May 1998 , pp. 467 - 481
Copyright
Copyright © Marine Biological Association of the United Kingdom 1998

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