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Morphological Variation in Feeding Traits of Native Hawaiian Stream Fishes

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Title:Morphological Variation in Feeding Traits of Native Hawaiian Stream Fishes
Authors:Kido, Michael H.
Date Issued:Apr 1996
Publisher:University of Hawaii Press
Citation:Kido MH. 1996. Morphological variation in feeding traits of native Hawaiian stream fishes. Pac Sci, 50(2): 184-193.
Abstract:The five native species of amphidromous gobioid fishes inhabiting
Hawaiian streams were compared for dentition, gut length to body length
ratios, intestinal convolution, gill raker morphology, position of mouth, and
diet. Based on morphological comparisons, three manipulative modes of feeding
are indicated, as follows: picking-biting, rock scraping, and sediment foraging.
Comparisons indicated a surprising predominance of algae in the diet of
all species despite various degrees of morphological specialization for their use.
Avoidance of competition for algae was therefore suggested as a potential factor
influencing species interactions and community organization. Differential
preference among native gobioids for stream invertebrates may also provide
mitigation for competitive interactions. Variation in food availability in the
benthic landscape of Hawaiian streams, possibly regulated by stream flow and
periodic disturbance, is hypothesized as being an important determinant of fish
community structure. Human-induced alteration of factors that regulate food
availability could therefore influence stability of native fish populations through
disturbance of their food base.
Pages/Duration:19 pages
Appears in Collections: Pacific Science Volume 50, Number 2, 1996

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