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JOURNAL OF PLANKTON RESEARCH | VOLUME 11 | NUMBER 4 | PAGES 729-745 | 1989
© Oxford University Press

research-article

Diurnal vertical and seasonal horizontal distribution patterns of Mysis relicta in a large Norwegian lake

Vidar Moen and Arnfinn Langeland

Norwegian Institute for Nature Research Tungasletta 2, N-7004 Trondheim, Norway

Received on August 1, 1988; accepted on February 24, 1989 Mysis relicta was sampled intensively along a depth profile in Lake Snåsavatnet using benthic trawls and vertical net hauls. Samples were made around 12.00 and 24.00 h in May, June, August and September 1984. The light regime and temperature were also recorded. Mysis relicta showed a size-dependent diurnal vertical migration and seasonal benthic horizontal migration between shallow and deep areas. The young individuals left the marsupium in spring while the adults were staying benthic in shallow areas. As they grew in size the young individuals changed habitat, migrating into the pelagic zone and the deeper benthic areas. Mysis showed a bimodal vertical distribution pattern on our deepwater station, with one density peak in the water column and another along the bottom both day and night between May and September. The bimodal distribution pattern is discussed in relation to the light regime and an asynchronic vertical migration model. The density of Mysis was low in the pelagic zone compared to the shallow benthic area throughout the sampling period. Together with the difference in distribution pattern in the pelagic and benthic zones, this may influence the distribution pattern of salinonids which seek Mysis as a food item in Lake Snåsavatnet.


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