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Predatory feeding of the hydromedusae Obelia geniculata and Phialla quadrata

Predatory feeding of the hydromedusae Obelia geniculata and Phialla quadrata 227 87 87 1 1 R. S. Fulton III R. G. Wear Department of Zoology Victoria University of Wellington Private Bag Wellington New Zealand Institute of Marine Sciences University of North Carolina 3407 Arendell Street 28557 Morehead City North Carolina USA Abstract In 1982–1983 nauplii and adults of several co-occurring copepods and Artemia sp. nauplii (Lake Grassmere, New Zealand strain) were fed to the hydromedusae Obelia geniculata (L.) and Phialella quadrata (Forbes), two species which are very abundant in Wellington Harbour, New Zealand. Clearance rates of both hydromedusae were significantly correlated with predator diameter, but independent of water temperature and prey density. P. quadrata consumed all developmental stages of some copepod species, but O. geniculata consumed only nauplii. Clearance rates of O. geniculata were most strongly related with the strength of the prey escape response, and showed little relation with prey size or movement rates. Clearance rates of P. quadrata were equally influenced by the prey escape response and prey size, but a large amount of the variability in clearance rates could not be explained by any of the prey characteristics, or by a linear combination of the prey characteristics. Clearance rates of the hydromedusae are combined with measures of hydromedusa abundance in Wellington Harbour to calculate daily per capita death rates of the prey. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

Predatory feeding of the hydromedusae Obelia geniculata and Phialla quadrata

Marine Biology , Volume 87 (1) – Jun 1, 1985

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References (53)

Publisher
Springer Journals
Copyright
Copyright © 1985 by Springer-Verlag
Subject
Life Sciences; Biomedicine general; Oceanography; Ecology; Microbiology; Zoology
ISSN
0025-3162
eISSN
1432-1793
DOI
10.1007/BF00397004
Publisher site
See Article on Publisher Site

Abstract

227 87 87 1 1 R. S. Fulton III R. G. Wear Department of Zoology Victoria University of Wellington Private Bag Wellington New Zealand Institute of Marine Sciences University of North Carolina 3407 Arendell Street 28557 Morehead City North Carolina USA Abstract In 1982–1983 nauplii and adults of several co-occurring copepods and Artemia sp. nauplii (Lake Grassmere, New Zealand strain) were fed to the hydromedusae Obelia geniculata (L.) and Phialella quadrata (Forbes), two species which are very abundant in Wellington Harbour, New Zealand. Clearance rates of both hydromedusae were significantly correlated with predator diameter, but independent of water temperature and prey density. P. quadrata consumed all developmental stages of some copepod species, but O. geniculata consumed only nauplii. Clearance rates of O. geniculata were most strongly related with the strength of the prey escape response, and showed little relation with prey size or movement rates. Clearance rates of P. quadrata were equally influenced by the prey escape response and prey size, but a large amount of the variability in clearance rates could not be explained by any of the prey characteristics, or by a linear combination of the prey characteristics. Clearance rates of the hydromedusae are combined with measures of hydromedusa abundance in Wellington Harbour to calculate daily per capita death rates of the prey.

Journal

Marine BiologySpringer Journals

Published: Jun 1, 1985

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