Production of Penilia avirostris in Kingston Harbour, Jamaica |
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| Authors: | Rose, Kim Roff, John C. Hopcroft, Russell R. |
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| Affiliation: | 1 Zoology Department, University of Guelph, Guelph, Ontario N1G 2W1, Canada and 2 Institute of Marine Science, University of Alaska, Fairbanks, Alaska 99775, USA 3 Present Address: Environmental Sciences, Acadia University, Wolfville, NS B4P 2RS, Canada |
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| Abstract: | The cladoceran Penilia avirostris is one of the more abundantand widespread members of the crustacean zooplankton in nearshoretropical and subtropical waters. Its abundance, biomass, fecundity,development rate and production were estimated in Kingston Harbour,Jamaica, during an 18 month period. Mean annual abundance ofPenilia was 1821 m3, while biomass (excluding eggs/embryos)was 2.87 mg ash-free dry-weight (AFDW) m3 (43.1 mg AFDWm2), accounting for 13% of the copepod community biomass.Fecundity increased with body size. There was no clear seasonalpattern of abundance, size or fecundity, nor were physical orbiological variables correlated to these variations. Developmenttime averaged 20.5 h for juveniles and 41.4 h for adult femalesduring incubations; there was no clear evidence of a diel patternto molting. Growth rate appeared to be exponential, with correspondingsomatic growth rates, averaging 0.27 day1 for juveniles,and 0.34 day1 for somatic plus reproductive growth inadult females. Annual production was estimated as 173 kJ m2year1, |
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