Peterson, W.T. & W.J. Kimmerer. (1994). Processes controlling recruitment of the marine calanoid copepod Temora longicornis in Long Island Sound: egg production, egg mortality, and cohort survival rates. Limnology and Oceanography 39(7):1594-1605.

107892

Peterson, W.T. & W.J. Kimmerer

1994

39(7):1594-1605.

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Three phytoplankton blooms were observed during our 6-month study period and each resulted in increased rates of egg production (EPR) by female Temora longicornis. An EPR of 50 eggs female- I d-l was observed during the first bloom (spring bloom, March). The maximum EPR observed during the other blooms (May and July) was 20 and 30 eggs female- ’ d- ’ . At all other times the EPR was nearly zero. Each pulse in egg production initiated a distinct cohort. Survivorship from egg to adult was low: 3% for the first cohort and 0.8% for the second. The third cohort did not reach maturity. Mortality was highest in the egg stage-only 10% of the eggs produced survived to first nauplius. Rates of egg mortality were positively correlated with clearance rates of T. Zongicornis, suggesting cannibalism as a cause of high mortality. However, the clearance rates required would be -34-fold too high, suggesting a different densitydependent factor, such as disease, viruses, ecto-parasitism or consumption by dinoflagellates. Advection and resting egg production do not appear to explain high rates of egg loss.

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