Influence of condition on behavior and survival potential of a newly settled coral reef fish, the bluehead wrasse Thalassoma bifasciatum
Influence of condition on behavior and survival potential of a newly settled coral reef fish, the bluehead wrasse Thalassoma bifasciatum
复制标题
DOI：
10.3354/meps327279
复制
发表时间：
2006-01-01
影响因子：
2.5
通讯作者：
Sponaugle, Su
中科院分区：
文献类型：
--
作者：
Grorud-Colvert, Kirsten;Sponaugle, Su
对于新定居的珊瑚礁鱼类，生存优势可能与导致行为差异的特定早期生活史特征或条件水平有关。为了确定与不同条件水平相关的生理和行为特征，在美国佛罗里达群岛上的珊瑚礁定居后立即收集蓝头鲸新兵，并将其运送到实验室进行实验分析。游泳能力的量化与耳石分析相结合以确定与游泳能力相关的早期生活史特征，具有最高临界游泳速度的鱼是那些幼体生长较快、中上层幼体持续时间较短、定居时较小的鱼，尽管这些个体仅占总样本的10%。为了进一步研究与条件相关的行为，一种饲养处理建立了两个不同条件水平的鱼作为比较。与缺乏食物的新兵相比，在高水平喂养1周的新兵生长更快，标准体重更高(富尔顿的条件系数)，游泳速度更快。在额外的行为试验中，高体能新兵比低体能新兵以更快的速度躲避模拟的捕食者威胁。高状况的鱼也表现出较少的冒险行为，因为它们在捕食者威胁下隐藏得更多，吃的食物也更少。对于条件较高和条件较差的新兵，在受到捕食者威胁的情况下，寻求庇护的人数增加，食物消耗率下降。这些结果将早期生活史特征和生理学与相关的基于条件的行为差异联系在一起，很可能是基于观察到的两色毛虫的死亡通常是条件选择性的。
For newly settled coral reef fishes, survival advantages may be associated with specific early life history traits or condition levels that lead to differences in behavior. To identify physiological and behavioral characteristics associated with different condition levels, bluehead wrasse Thalassoma bifasciatum recruits were collected immediately after settlement from reefs in the upper Florida Keys, USA, and transported to the laboratory for experimental analysis. Quantification of swimming capabilities was coupled with otolith analysis to identify early life history traits associated with swimming performance, Fish with the highest critical swimming speeds were those that grew faster as larvae, had shorter pelagic larval durations, and were smaller at settlement, although these individuals represented only 10% of the total sample. To further investigate condition-associated behaviors, a feeding treatment established fish of 2 different condition levels for comparison. Recruits fed for 1 wk at higher levels grew faster, had greater standardized weight (Fulton's condition factor), and swam faster than food-deprived recruits. In additional behavioral trials, high condition recruits evaded a simulated predator threat at faster speeds than the low condition recruits. High condition fish also exhibited less risk-taking behavior by sheltering more in the presence of a predator threat and consuming less food. For both high and low condition recruits, the number that sought shelter increased and food consumption rates decreased in the presence of a predator threat. These results link early life history traits and physiology with associated condition-based differences in behavior, likely underlying the observation that mortality in T. bifasciatum is frequently selective for condition.