The influence of ontogeny and environment on the diet of lookdown dory, Cyttus traversi

Research on trophic relationships is an important component in the move towards an ecosystem approach to fisheries management. The diet of lookdown dory, Cyttus traversi, was determined from examination of stomach contents of 239 specimens of 13.9-50.7 cm total length (TL), sampled at depths of 220-...

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Bibliographic Details
Published in:New Zealand journal of marine and freshwater research 2010-12, Vol.44 (4), p.329-342
Main Authors: Forman, JS, Dunn, MR
Format: Article
Language:English
Subjects:
benthopelagic
Campylonotus rathbunae
Chatham Rise
Coelorinchus
Cyttus
depth
Diet
feeding ecology
Freshwater
Marine
Munida
Pasiphaea
Sergestes
trophic
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Summary:Research on trophic relationships is an important component in the move towards an ecosystem approach to fisheries management. The diet of lookdown dory, Cyttus traversi, was determined from examination of stomach contents of 239 specimens of 13.9-50.7 cm total length (TL), sampled at depths of 220-744m on Chatham Rise, New Zealand. The diet was characterised by the macrourid fish, Coelorinchus oliverianus, the natant decapods, Lipkius holthuisi, Campylonotus rathbunae, Sergestes spp., Notopandalus magnoculus, and Pasiphaea spp., and the galatheid, Munida gracilis. Multivariate analyses using distance-based linear models, non-parametric multi-dimensional scaling and similarity percentages indicated the best predictors of diet variability were depth and fish length. Diet changes associated with depth were most apparent in the crustacean prey. Changes in the diet with ontogeny suggested four ontogenetic trophic units: pelagic (40 cm TL; benthopelagic piscivores/omnivores).
ISSN:0028-8330
1175-8805
DOI:10.1080/00288330.2010.523080