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Habitat shifts of Mysis relicta (Decapoda, Mysidacea) in the lakes Breiter and Schmaler Luzin (NE Germany)

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Between spring 2001 and autumn 2004, the habitat use, vertical migration, and density of Mysis relicta in the lakes "Breiter Luzin" and "Schmaler Luzin" in northeastern Germany were investigated by horizontal net hauls, epibenthic sledge hauls, and SCUBA diving. On 3–4 July 2001 we estimated a density of 466.03 ind./m2 in the water column of lake "Breiter Luzin", but in April of 2002 population density was only 5.26 ind./m2. In October 2004 the observed densities increased with depth, starting at the lower sublittoral down to the upper profundal on about 1000 ind./m2. Downward from 22 m, densities fluctuated around this value up to 30 m depth. During daytime, mysids were never observed above 9 m. Below this limit all suitable parts of both lakes were occupied. We found no evidence for a preference of different sediment types as mud or sand. During daytime mysids showed a strong affinity for the lake bottom, and adults tend to live in deeper areas than juveniles. At night this distribution seems to be inverted. In July 2001 the proportion of adults (especially females) was highest in the metalimnion and the upper hypolimnion, whereas the proportion of juveniles increased with depth. In den im Nordosten Deutschlands gelegenen Seen Breiter und Schmaler Luzin wurde die Habitatnutzung, vertikale Migration und Dichte von Mysis relicta zwischen Frühjahr 2001 und Herbst 2004 mit einer epibenthischer Dredge, mit Horizontalnetzen und Taucheinsätzen untersucht. Im Breiten Luzin wurde in der Nacht vom 3. zum 4. Juli 2001 im Freiwasser eine Dichte von 466,03 Ind./m2 ermittelt. Im April 2002 betrug die Dichte lediglich 5,26 Ind./m2. Die Dichte der sich am Tage dicht über dem Boden aufhaltenden Tiere stieg vom Sublittoral zum oberen Profundal hin auf ca. 1000 Ind./m2 an. Unterhalb 22 m blieb diese Dichte bis in 30 m Wassertiefe mit geringen Schwankungen konstant. Oberhalb 9 m konnten am Tag keine Mysis-Individuen nachgewiesen werden. Unterhalb dieser Grenze wurden dagegen alle geeigneten Benthalbereiche besiedelt. Eine Substratpräferenz für Mudde oder sandige Sedimente konnte nicht festgestellt werden. Am Tage bevorzugt Mysis die Bodenoberfläche und adulte Tiere halten sich tendenziell in größerer Tiefe als Jungtiere auf. Nachts wurden im Metalimnion und im oberen Hypolimnion dagegen größere Konzentrationen von adulten, besonders weiblichen, Tieren gefunden, während der Anteil von Jungtieren mit der Tiefe zunahm.

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/content/journals/10.1163/156854005774353467
2005-06-01
2016-12-08

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