Vestheim Hege, Kaartvedt Stein
Department of Biology , University of Bergen , Jahnebakken 5, PO Box 7800, N-5020 Bergen , Norway.
J Plankton Res. 2009 Nov;31(11):1427-1435. doi: 10.1093/plankt/fbp077. Epub 2009 Sep 11.
Intraspecific variation in vertical distribution, timing of vertical migration, and colouration of the mesopelagic shrimp Sergestes arcticus were studied in the >400 m deep part of Masfjorden, Norway. Very few individuals were caught in the upper strata during daytime, and larger individuals occurred deeper during the day than smaller ones. Vertical migration was prominent and no overall trend of increasing length with depth was found at night. Small individuals arrived in the upper layers earlier than larger ones. Animal colouration assessed by digital photography revealed significant variance in individual redness. Depth of capture was the most important factor explaining colouration, with increasing degree of redness with depth. Assessing the gut fullness of the transparent shrimps provided a rapid way of estimating feeding activity and showed that feeding took place mainly at night.
在挪威马斯峡湾400米以下深处，对中上层虾类北极 Sergestes arcticus 的垂直分布、垂直洄游时间和体色的种内变异进行了研究。白天在上层捕获到的个体极少，白天较大个体所处深度比小个体更深。垂直洄游显著，夜间未发现体长随深度增加的总体趋势。小个体比大个体更早到达上层。通过数码摄影评估的动物体色显示个体红色度存在显著差异。捕获深度是解释体色的最重要因素，红色度随深度增加。评估透明虾的肠道饱满度提供了一种快速估计摄食活动的方法，结果表明摄食主要发生在夜间。
