Ecology of Mysidacea

Volume 10 of the series Developments in Hydrobiology pp 41-51

Production, population biology and diet of Neomysis integer (Leach) in a shallow Frisian lake (The Netherlands)

  • P. BremerAffiliated withLimnological Institute, Tjeukemeer Laboratory
  • , J. VijverbergAffiliated withLimnological Institute, Tjeukemeer Laboratory

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The Neomysis integerpopulation of a shallow Frisian freshwater lake, situated in the north of the Netherlands, was studied from May until October 1980. The results were compared with observations on populations in other Frisian lakes, and with the results reported by other authors on brackish-water and marine populations of this species.

Three generations were observed: one overwintering generation and two summer generations. Reproduction stopped completely during winter. During 1980 population densities of N. integerwere relatively low in all Frisian lakes. In Slotermeer the maximum population density was only 6 individuals m-2, production amounted to 10 mg dry wt m-2yr-1. The annual P/B ratio was 4.0. The diet of N. integer consisted, in terms of biomass, of more than 95% detritus and animal food, the latter mainly consisting of Bosminaand cyclopoid copepods. Feeding intensity reached a maximum at sunset. It was still high during the first part of the night and was low in the morning just after sunrise.


Mysidacea production population structure brood size diet Neomysis integer