Muscle fiber type distribution in climbing Hawaiian gobioid fishes: Ontogeny and correlations with locomotor performance
Muscle fiber type distribution in climbing Hawaiian gobioid fishes: Ontogeny and correlations with locomotor performance
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DOI：
10.1016/j.zool.2007.06.004
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发表时间：
2008-01-01
期刊：
影响因子：
2
通讯作者：
Schoenfuss, Heiko L.
中科院分区：
文献类型：
--
作者：
Cediel, Roberto A.;Blob, Richard W.;Schoenfuss, Heiko L.
夏威夷的三种两性鱼以其攀爬高达数百米的瀑布的能力而闻名。康色扁豆和关岛扁豆幼体用快速的轴向波动攀爬，而鳞翅目幼体则用慢得多的动作攀爬，在几个周期的长时间循环中交替地将口腔和盆腔吸盘附着在底物上。根据这些不同的攀缘方式，我们推测康色石斑鱼和关岛石龙虾幼体的推进肌肉结构将以白色肌肉纤维为主，而斯蒂姆松石斑鱼的红色肌肉纤维比例高于其他攀缘植物。我们进一步预测，由于这些物种的成鱼从爬行转变为以突发性游泳为主要运动行为，这三种成鱼的肌肉将由白色纤维主导。为了验证这些假设，我们使用ATPase分析来评估夏威夷攀岩虎鱼三个解剖区域(中体、肛门和尾巴)的肌肉纤维类型分布。在这三个物种的幼体中，轴向肌肉结构都是由白色肌肉纤维主导的。但斯廷普森幼鱼的红色纤维比例明显高于其他两个物种。成鱼和幼鱼的纤维类型比例没有显著差异。因此，青少年的肌肉纤维类型比例似乎有助于适应这些物种之间运动需求的差异，这表明它们通过不同的行为和生理特化克服了攀登瀑布的共同挑战。(C)2008年爱思唯尔股份有限公司。版权所有。
Three species of Hawaiian amphidromous gobioid fishes are remarkable in their ability to climb waterfalls up to several hundred meters tall. Juvenile Lentipes concolor and Awaous guamensis climb using rapid bursts of axial undulation, whereas juvenile Sicyopterus stimpsoni climb using much slower movements, alternately attaching oral and pelvic sucking disks to the substrate during prolonged bouts of several cycles. Based on these differing climbing styles, we hypothesized that propulsive musculature in juvenile L. concolor and A. guamensis would be dominated by white muscle fibers, whereas S. stimpsoni would exhibit a greater proportion of red muscle fibers than other climbing species. We further predicted that, because adults of these species shift from climbing to burst swimming as their main locomotor behavior, muscle from adult fish of all three species would be dominated by white fibers. To test these hypotheses, we used ATPase assays to evaluate muscle fiber type distribution in Hawaiian climbing gobies for three anatomical regions (midbody, anal, and tail). Axial musculature was dominated by white muscle fibers in juveniles of all three species.. but juvenile S. stimpsoni had a significantly greater proportion of red fibers than the other two species. Fiber type proportions of adult fishes did not differ significantly from those of juveniles. Thus, muscle fiber type proportions in juveniles appear to help accommodate differences in locomotor demands among these species, indicating that they overcome the common challenge of waterfall climbing through both diverse behaviors and physiological specializations. (c) 2008 Elsevier GmbH. All rights reserved.