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JPR Advance Access originally published online on September 11, 2009
Journal of Plankton Research 2009 31(11):1427-1435; doi:10.1093/plankt/fbp077
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© The Author 2009
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Vertical migration, feeding and colouration in the mesopelagic shrimp Sergestes arcticus

Hege Vestheim1,* and Stein Kaartvedt2

1 Department of Biology, University of Bergen, Jahnebakken 5, PO Box 7800, N-5020 Bergen, Norway 2 Department of Biology, University of Oslo, PO Box 1066, Blindern, N-0316 Oslo, Norway

* CORRESPONDING AUTHOR: hege.vestheim{at}gmail.com

Received on January 28, 2009; accepted on August 6, 2009


  Abstract

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.

Corresponding editor: Mark J. Gibbons


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