Effects of seascape context on condition, abundance, and secondary production of a coral reef fish, Haemulon plumierii
Effects of seascape context on condition, abundance, and secondary production of a coral reef fish, Haemulon plumierii
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海景环境对珊瑚礁鱼 Haemulon plumierii 的状况、丰度和二次生产的影响
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发表时间：
2012
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影响因子：
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通讯作者：
C. Layman
中科院分区：
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作者：
L. Yeager;Christina L. Acevedo;C. Layman
海景组成的变化有可能影响鱼类的栖息地质量，并且在许多系统中，周围海景的特征与生物的丰度相关。较少研究的是海景环境如何影响生境质量的其他方面，包括焦点物种的生长、条件或生产。众所周知，白咕哝鱼幼鱼白天在小块珊瑚礁上休息，晚上进入海草栖息地觅食，通过这些日常觅食迁徙将多个栖息地联系起来。我们在海草覆盖的梯度上创建了人工鱼礁，并确定了幼鱼的状况、生长、丰度和次生产量与海景内海草覆盖的关系。白鲈丰度与海景内海草盖度呈正相关，而不同海景内珊瑚礁的条件（相对条件因子Kn）和生长速率（RNA / DNA比值）无显著差异。在海草较多的海景中，珊瑚的次生产量最高。我们的结果与假设一致，即增加的食物资源与更高的海草覆盖有关，有助于增加咕噜产量。生境质量差异主要表现在种群（丰度）和生态系统功能（次生生产）水平上，而不表现在个体（个体生长速度或条件因子）水平上。这些结果强调了在生境质量评估中考虑个体和种群多层次反应的重要性，并进一步证明了在空间明确的管理策略中应考虑海景组成。
Variation in seascape composition has the potential to impact habitat quality for fishes, and characteristics of the surrounding seascape have been correlated with abundance of organisms in many systems. Less studied is how seascape context may affect other aspects of habitat quality including growth, condition, or production of focal species. Juvenile white grunts Haemulon plumierii are known to rest on patch reefs during the day and move into seagrass habitat at night to feed, linking multiple habitats through these daily foraging migrations. We created artificial reefs across a gradient of seagrass cover and determined how juvenile white grunt condition, growth, abundance, and secondary production were related to seagrass cover within the seascape. White grunt abundance was positively correlated with the cover of seagrass within the seascape, while condition (relative condition factor, Kn) and growth rate (measured using the ratio of RNA to DNA) did not vary among reefs within different seascapes. Secondary production of white grunts was found to be highest on reefs in seascapes with more seagrass. Our results are consistent with the hypothesis that increased food resources associated with higher seagrass cover contribute to increased grunt production. Differences in habitat quality among reefs in different seascapes were manifest at the population (abundance) and ecosystem function (secondary production) levels and not at the individual level (individual growth rate or condition factor). These results highlight the importance of considering multiple levels of individual and population responses in assessments of habitat quality, and add evidence that seascape composition should be considered in spatially explicit management strategies.