Department of Biological Sciences, Clemson University, SC 29634, USA.
Zoology (Jena). 2011 Dec;114(6):340-7. doi: 10.1016/j.zool.2011.05.005. Epub 2011 Oct 5.
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.
先前的研究表明，夏威夷鰕虎鱼类轴肌的纤维类型分布差异与物种间的运动性能、行为和食性差异有关。本研究使用 ATP 酶测定法，研究了 5 个物种的开口颏舌骨肌的纤维类型，以及 3 种闭口颌肌（A1、A2 和 A3 下颌肌）的纤维类型。一些夏威夷溪流鰕虎鱼的颌肌含有大量的红肌纤维成分。一些颌肌的白肌纤维比例总是高于其他颌肌，而与物种无关。此外，与物种间比较，杂食性鱼类（Awaous guamensis 和 Stenogobius hawaiiensis）的所有颌肌中的白肌纤维比例均低于食性特化鱼类（Lentipes concolor、Sicyopterus stimpsoni 和 Eleotris sandwicensis）。在夏威夷溪流鰕虎鱼中，与食性特化鱼类相比，杂食性鱼类的饮食可能更有利于颌肌发挥更广泛的运动性能，因为它们混合了红肌和白肌纤维，而食性特化鱼类的颌肌中可能有更高比例的快速抽搐白肌纤维，以满足快速捕食或在快速流动的栖息地觅食的需求。
