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A study of a population of Marinogammarus marinus (Leach) in the Oosterschelde
Vlasblom, A.G. (1969). A study of a population of Marinogammarus marinus (Leach) in the Oosterschelde. Neth. J. Sea Res. 4(3): 317-338. hdl.handle.net/10.1016/0077-7579(69)90003-9
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
Peer reviewed article  

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Keyword
    Marine

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  • Vlasblom, A.G.

Abstract
    The population of Marinogammarus marinus (Leach) of Kattendijke on the Oosterschelde has been studied to provide a basis for the ecological and physiological investigations to be carried out when execution of the “Delta Plan” changes the marine into a fresh water environment.Monthly samples were taken and in vitro cultures established for investigation of the life cycle and the population structure.The life cycle of M. marinus is annual, but production takes place the whole year round. There is no distinct period during which all females are resting, although high temperatures in summer and low ones in winter affect the number of ovigerous females negatively.Although the quantity of eggs per brood per female size varies with the season, this fluctuation is not synchronous with variation in temperature.Reproduction is highest in spring when large female size, high number of ovigerous females, large number of eggs per brood per female size, and good embryonic development coincide.A second but lower optimum of reproduction occurs in autumn.These reproductive activities give rise to large juvenile populations in June and November, both of which contribute to establish a high productivity in spring.

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