Abstract
The reproductive cycle and growth parameters were studied in a Melinna palmata population, for 3 yr after dredging, in the vicinity of the harbour of Brest, France. This species first settled in May 1979, 8 mo after dredging had ceased. Measurements of the diameter of coelomic oocytes indicated that spawning took place from August to October and settlement in autumn and early winter. The first settled cohort displayed a high growth rate (0.25 mm width mo-1 in summer) and a low longevity (22 mo); the growth rate of the second settled cohort was not significantly different from the first, but its longevity was higher (28 mo); the third settled cohort had a lower growth rate (0.15 mm width per month), but lower mortality and therefore a longer life expectancy. A fourth cohort appeared in August 1981 but was not followed because of the termination of the study. M. palmata colonised the dredged area in two ways: by settlement of juveniles in autumn and by probable immigration of young and adults in May. The population increased in number and biomass from the end of dredging (August, 1978) to June 1981 and decreased after this period. The demographic strategy of this species changed from r- to K-selection during this recolonization as a result of intraspecific and interspecific competition.
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Communicated by J. M. Pérès, Marseille
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Guillou, M., Hily, C. Dynamics and biological cycle of a Melinna palmata (Ampharetidae) population during the recolonisation of a dredged area in the vicinity of the harbour of Brest (France). Mar. Biol. 73, 43–50 (1983). https://doi.org/10.1007/BF00396284
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DOI: https://doi.org/10.1007/BF00396284