Diets of four deep-water scaphopod species (Mollusca) in the North Atlantic and the Nordic Seas

G. Gudmundsson; K. Engelstad; G. SteinerJ. Svavarsson

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Diets of four deep-water scaphopod species (Mollusca) in the North Atlantic and the Nordic Seas

机译：Diets of four deep-water scaphopod species (Mollusca) in the North Atlantic and the Nordic Seas

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The buccal pouch contents of four deep-water scaphopod (Mollusca) species, Pulsellum affine, Pulsellum teres, Siphonodentalium lobatum and Polyschides olivi, collected in the North Atlantic and the Nordic Seas, were examined. The buccal pouches of the examined scaphopod species contained almost exclusively foraminifers, which agrees with previous studies on shallow and deep-water scaphopods. The scaphopods seemed to be engulfing at least some of the most common foraminifer species, which are distributed in the cold waters of the Nordic Seas or the temperate waters in the northernmost part of the North Atlantic. About half of the food species (30 foraminifer species) occurred in only one scaphopod species, nearly always in very low numbers, and seemed to be an unimportant food source. The remaining and more frequent food species occurred in two or more scaphopod species. A similarity tree was calculated with parsimony and presence–absence coding of the food species in the scaphopods. This resulted in the similarity tree: 100{P. teres 79P. affine 70(P. olivi and P. lobatum)}, when branch support was measured with percentage jackknife stability. A general trend was found towards larger food items being consumed by larger scaphopod species, indicated by the positive correlation between the size of the scaphopods and the food species. It is suggested that microdistribution of the foraminifers and the large individual size of the foraminifers may be important factors in avoiding predation by scaphopods.

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《Marine Biology: International Journal on Life in Oceans and Coastal Waters》 |2003年第6期|1103-1112|共10页
作者
G. Gudmundsson; K. Engelstad; G. SteinerJ. Svavarsson;
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Icelandic Museum of Natural History, Hlemmur 3, PO Box 5320, 125, Reykjavik, Iceland;

Department of Fisheries and Marine Biology, University of Bergen, 5020, Bergen, Norway;

Institute of Zoology, University of Vienna, Althanstrasse 14, 1090, Vienna, AustriaInstitute of Biology, University of Iceland, Grensasvegur 12, 108, Reykjavik, Iceland;

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中图分类环境生物学;
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Diets of four deep-water scaphopod species (Mollusca) in the North Atlantic and the Nordic Seas

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