Variability in nursery function of tropical seagrass beds during fish ontogeny : Timing of ontogenetic habitat shift
Variability in nursery function of tropical seagrass beds during fish ontogeny : Timing of ontogenetic habitat shift
复制标题
鱼类个体发育过程中热带海草床育苗功能的变异性：个体发育栖息地转变的时间
DOI：
10.1007/s00227-012-1911-z
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发表时间：
2012
期刊：
影响因子：
2.4
通讯作者：
Yoshiro Watanabe
中科院分区：
文献类型：
--
作者：
Yohei Nakamura;Keisuke Hirota;Takuro Shibuno;Yoshiro Watanabe
海草床通常被认为是珊瑚礁鱼类的重要苗圃，但这些苗圃功能（避难所和食物供应）在不同的少年阶段的有效性知之甚少。为了了解幼鱼对海草苗圃功能的需求如何决定个体发育栖息地从海草床转移到珊瑚礁的时间，我们对三种不同大小的珊瑚礁鱼太平洋黄尾天皇（Lethrinus atkinsoni）在日本南部石垣岛海草床的幼鱼期进行了目视横断面调查和现场拴系和笼养实验。研究表明，虽然个体L.虽然在海草苗圃停留期间，atkinsonijuvenile减少了> 90%，但苗圃的庇护和/或食物供应功能，至少对于全长约5 cm的幼鱼来说，提供了最佳的生存和生长选择。大型鱼类（>8 cm TL）个体发育迁移到珊瑚礁的时间归因于不同生境中大型食物的觅食效率。总体而言，海草床苗圃的功能改变与少年的身体大小，在早期的少年阶段，海草床相比，珊瑚礁的生存率略高，增长率显着更大。这将有助于增加最终被招募为成年人的人数。
Seagrass beds are often considered to be important nurseries for coral reef fish, yet the effectiveness of these nursery functions (refuge and food availability) at different juvenile stages is poorly understood. To understand how the demands of juvenile fish on seagrass nursery functions determines the timing of ontogenetic habitat shifts from seagrass beds to coral reefs, we conducted visual transect survey and field tethering and caging experiments on three different sizes of the coral reef fish Pacific yellowtail emperor (Lethrinus atkinsoni) during its juvenile tenure in seagrass beds at Ishigaki Island, southern Japan. The study showed that although the number of individualL. atkinsonijuveniles decreased by >90 % during their stay in the seagrass nursery, the shelter and/or food availability functions of the nursery, at least for a juvenile size of approximately 5 cm total length (TL), provided the best survival and growth option. The timing of ontogenetic migration to coral reefs of larger fish (>8 cm TL) was attributed to foraging efficiency for larger food items in different habitats. Overall, the function of the seagrass bed nursery changed with juvenile body size, with marginally higher survival and significantly greater growth rates during early juvenile stages in seagrass beds compared to coral reefs. This would contribute to the enhancement in the number of individuals eventually recruited to adult populations.