期刊
ZOOLOGY
卷 114, 期 6, 页码 340-347出版社
ELSEVIER GMBH
DOI: 10.1016/j.zool.2011.05.005
关键词
Muscle performance; Jaw opening performance; Feeding style; Fiber type; Gobiidae
类别
资金
- NSF [IOS-0817911, IOS-0817794]
- St. Cloud State University Faculty
- Clemson University
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [0817794, 0817911] Funding Source: National Science Foundation
Differences in fiber type distribution in the axial muscles of Hawaiian gobioid stream fishes have previously been linked to differences in locomotor performance, behavior, and diet across species. Using ATPase assays, we examined fiber types of the jaw opening sternohyoideus muscle across five species, as well as fiber types of three jaw closing muscles (adductor mandibulae A1, A2, and A3). The jaw muscles of some species of Hawaiian stream gobies contained substantial red fiber components. Some jaw muscles always had greater proportions of white muscle fibers than other jaw muscles, independent of species. In addition, comparing across species, the dietary generalists (Awaous guamensis and Stenogobius hawaiiensis) had a lower proportion of white muscle fibers in all jaw muscles than the dietary specialists (Lentipes concolor. Sicyopterus stimpsoni. and Eleotris sandwicensis). Among Hawaiian stream gobies, generalist diets may favor a wider range of muscle performance, provided by a mix of white and red muscle fibers, than is typical of dietary specialists, which may have a higher proportion of fast-twitch white fibers in jaw muscles to help meet the demands of rapid predatory strikes or feeding in fast-flowing habitats. (C) 2011 Elsevier GmbH. All rights reserved.
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