Vertical distribution and feeding pattern of Euphausiacea (Crustacea) in the eastern Banda Sea (Indonesia) during the SE and NW monsoons
van Couwelaar, M. (1994). Vertical distribution and feeding pattern of Euphausiacea (Crustacea) in the eastern Banda Sea (Indonesia) during the SE and NW monsoons. J. Plankton Res. 16(12): 1717-1740. https://dx.doi.org/10.1093/plankt/16.12.1717
In: Journal of Plankton Research. Oxford University Press: New York,. ISSN 0142-7873; e-ISSN 1464-3774, more
Related to:van Couwelaar, M. (1998). Vertical distribution and feeding pattern of Euphausiacea (Crustacea) in the eastern Banda Sea (Indonesia) during the SE and NW monsoons, in: van Couwelaar, M. Pelagic faunas in monsoon ruled seas. pp. 45-70, more
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| Abstract |
The vertical distribution of Euphausiacea (Crustacea) in the eastern Banda Sea (Indonesia) during the SE and NW monsoon seasons was studied. In August 1984 and February/ March 1985, stratified day and night sampling was carried out between 0 and 500 m at four stations. A total of 31 species was found, of which most were present in both monsoon seasons. Species with a high presence in samples and performing diurnal vertical migration in both monsoon seasons were Euphausia diomedeae, Euphausia pseudogibba, Thysanopoda monacantha, Thysanopoda iricus-pidaia and Nematoscelis microps . Species with a high presence in samples showing no diurnal vertical migration in both monsoon seasons were Euphausia similis, Nematobrachion boopis. Nematoscelis tenella, Stylocheiron maximum and Thysanopoda orientalis . The density of Euphausiacea at the sampled stations was higher, but more heterogeneous, in the nutrient-enriched SE monsoon period than in the relatively nutrient-poor NW monsoon season, when densities were lower and more similar. The vertical distributions and diurnal vertical migration of species did not show a unanimous and strong response to seasonal hydrographic differences. The day–night depth distribution pattern of the Euphausiacea population in the upper 500 m is largely the same in both seasons, with comparable migration ranges. Some species showed a somewhat upward shifted depth distribution in the nutrient-enriched period. For mesopelagic and bathypelagic species especially, food resources were then favourable in the upper layers, as indicated by rare records of Thysanopoda crisiata . Analyses of stomach contents snowed mainly a nocturnal feeding pattern for the diurnal vertical migrating species and a continuous feeding pattern for the non-migrating species. |
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