Comparative morphology of the feeding basket of five species of Euphausia (Crustacea,Euphausiacea) in the western North Pacific,with some ecological considerations |
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Authors: | Suh Hae-Lip Choi Sang-Duk |
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Institution: | (1) Department of Oceanography, Chonnam National University, Kwangju, 500-757, Republic of Korea E-mail address;(2) Department of Aquaculture, Yosu National University, Yosu, Chonnam, 550-749, Republic of Korea |
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Abstract: | The feeding basket morphology and stomach content analyses of five Euphausia species (E. recurva, E. nana, E. pacifica, E.
mutica and E. similis) were compared to elucidate their feeding ecology. The filter areas of feeding basket of E. pacifica
and E. nana were proportionally larger than those of others in the size classes 13-20 mm and <13 mm, respectively, suggesting
a high filtering efficiency in these species at each size class. Based on the secondary setal distance, it is suggested that
there are three types of feeding basket in five Euphausia species. One is the fine mesh (<5 μm) of E. pacifica and E. nana;
a second is the medium (10-20 μm) of E. recurva and E. mutica; and the third is the coarse (20-30 μm) of E. similis. The ability
to feed on particles <5 μm would give both species, E. pacifica and E. nana, a great advantage over other species when number
of flagellates is high. Stomach content analyses indicated a more omnivorous feeding mode in E. mutica, E. recurva and E.
similis and a more herbivorous in E. pacifica and E. nana. This is in agreement with morphological studies of feeding baskets.
Increments in the primary and secondary setal distances with increasing size of four Euphausia species, except E. pacifica,
were evident, reflecting interspecific differences in food particle sizes utilized. In E. pacifica, however, the morphological
similarity should produce intraspecific competition in diet.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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Keywords: | morphology feeding basket Euphausia North Pacific |
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