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JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 12 | PAGES 2233-2250 | 1995
© Oxford University Press

research-article

Egg production of individual copepods of Acartia grani Sars from coastal waters: seasonal and diel variability

Valeriano Rodriguez, Francisco Guerreo1 and Bebona Bautista

Universidad de Málaga, Departamento de Ecologia, Campus Universitario de Teatinos 29071 Málaga, Spain 1Universidad de Jaén, Departamento de Biologia Animal, Vegetal y Ecologia, Facultad de Ciencias Experimentales Paraje Las Lagunillas, s/n 23071 Jaen, Spain

Received on April 11, 1995; accepted on August 14, 1995 Seasonal and diel fecundity patterns of adult Acartia grani females from a coastal area of Malaga Bay (south of Spain) were studied between spring and autumn 1990. Copepod egg production was measured in situ by short-term (≤24 h) incubations of isolated females in seawater screened through a 37 µm mesh. The response of egg laying to changes in both food quantity and composition was investigated by comparing egg production by copepods incubated in (i) surface water filtered through a 37 µm sieve, (ii) surface water filtered through a 37 µm sieve enriched with laboratory-cultured alga and (iii) starvation conditions. On a seasonal scale, neither temperature nor chlorophyll served to predict completely the egg production rate. Instead, the coincidence of (i) a temperature increase from the winter minima of 13.5 to 18°C and (ii) a spring chlorophyll maximum (7.4 µg l–1) appeared to act as synergetic triggers for an explosive reproduction (mean = 79 eggs female ‘day’) of the adult copepods present in the water column. Egg laying showed no diel patterns, but the egg production of field-collected females was markedly influenced by the amount and quality of available food during incubation.


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