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首页> 外文期刊>Marine ecology progress series >Structure, food and shade attract juvenile coral reef fish to mangrove and seagrass habitats: a field experiment
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Structure, food and shade attract juvenile coral reef fish to mangrove and seagrass habitats: a field experiment

机译：结构，食物和阴影吸引了幼小的珊瑚礁鱼到红树林和海草栖息地：一项野外试验

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Mangroves and seagrass beds are considered nurseries for juvenile fish, but little experimental evidence exists to elucidate which factors make them attractive habitats. A multifactorial field experiment on the use of these habitats by juvenile reef fish and their behaviour was performed during daytime with experimental units (EUs: 1 x 1 x 0.8 m), each representing a unique combination of the factors structure, shade, and food, using artificial seagrass leaves (AS) and artificial mangrove roots (AM). Diurnally active herbivores were most abundant in EUs containing food, and grazed on algae growing on the structures, but were not attracted to structures in the absence of food. The most abundant diurnally active zoobenthivores (Eucinostomus spp.) were present in highest numbers in any EU with food, where they fed on zoobenthos or rested on the bottom. The nocturnally active zoobenthivore/zooplanktivore Ocyurus chrysurus and the diurnally active piscivore Sphyraena barracuda were primarily attracted to structure, in which they rested and were not observed to feed. Haemulon flavolineatum was mainly attracted to AS, Lutjanus mahogoni was attracted to AS or shade, whereas L. apodus, O. chrysurus and S. barracuda were found in AM as well as in AS. The data suggest that during daytime, herbivores and diurnally active zoobenthivores are probably attracted to mangroves and seagrass beds primarily by food, and nocturnally active zoobenthivores by structure (in interaction with shade) that offers shelter from predation. S. barracuda is also attracted primarily to structure, but the larger individuals probably use this for ambush predation rather than for protection. In conclusion, our experiment clarifies that presence of structure, food and shade significantly contribute to the attractiveness of mangroves and seagrass beds to juvenile reef fish.
机译：红树林和海草床被认为是幼鱼的育苗场，但是很少有实验证据来阐明哪些因素使它们成为诱人的栖息地。在白天，使用实验单位（欧盟单位：1 x 1 x 0.8 m）对幼鱼利用这些栖息地及其行为进行了多因素野外实验，每个实验单元代表因素结构，阴影和食物的独特组合，使用人造海草叶（AS）和人造红树林根（AM）。在含有食物的欧盟中，具有昼夜活性的草食动物最为丰富，并在结构上生长的藻类上放牧，但是在没有食物的情况下它们不会被结构吸引。在所有欧盟以食物为食的动物中，最活跃的昼夜活跃的兽底动物（Eucinostomus spp。）数量最多，它们以兽底动物为食或在其底部休息。夜间活动的兽栖底栖动物/斑节对虾（Ocyurus chrysurus）和昼夜活动的食草食蟹鳞梭菌（Sphyraena barracuda）主要被结构吸引，它们在其中休息且未觅食。 Haemulon flavolineatum主要被AS所吸引，Lutjanus mahogoni被AS或阴影所吸引，而L. apodus，O。chrysurus和S. barracuda在AM和AS中被发现。数据表明，在白天，草食动物和具有昼夜活动性的食虫动物可能主要被食物吸引到红树林和海草床上，而夜间活动的食虫动物的结构（与阴影相互作用）则可以为捕食提供庇护。梭子鱼也主要被结构吸引，但是较大的个体可能将其用于伏击捕食而不是保护。总之，我们的实验表明，结构，食物和阴影的存在显着促进了红树林和海草床对幼礁鱼的吸引力。

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