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首页> 外文期刊>Marine ecology progress series >Distribution of coral reef fishes along a coral reef-seagrass gradient: edge effects and habitat segregation
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Distribution of coral reef fishes along a coral reef-seagrass gradient: edge effects and habitat segregation

机译：沿珊瑚礁-海草梯度分布的珊瑚礁鱼类的分布：边缘效应和生境隔离

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Coral reefs and seagrass beds are often located adjacent to one another, but little is known about the degree to which their fish communities are interlinked. To determine whether coral reef fishes on the coral reef are interlinked with or segregated from fishes on adjacent seagrass beds, a 60 m coral reef-seagrass gradient was studied on the island of Zanzibar in the western Indian Ocean. Using underwater visual census, coral reef fishes were surveyed in 4 habitat zones: (1) a coral patch reef, (2) seagrass beds bordering the coral reef, (3) seagrass beds at a 30 m distance from the coral reef edge and (4) seagrass beds at a 60 m distance from the coral reef edge. Based on the densities of juveniles and adults in the 4 zones, the 48 species that were observed were classified into reef-associated species, seagrass-associated species, nursery species, generalists and rare species. Reef-associated species occurred almost exclusively on the coral reef and at the reef-seagrass edge, while seagrass-associated species occurred almost exclusively on the seagrass beds. Generalists and seagrass-associated species occurred in all 3 seagrass zones, but densities of generalists on seagrass beds decreased with increasing distance from the reef, whereas that of seagrass-associated species increased. Reef-associated and generalist species showed an edge effect, where densities on the seagrass beds near the reef edge were higher than on the seagrass beds further away. Juvenile densities of nursery species on seagrass beds also increased with the distance from the reef, whereas their adults showed the highest densities on the coral reef, suggesting a possible ontogenetic shift from the seagrass beds to the reef. The results of the present study show that this seagrass-coral reef landscape features habitat segregation between species and life stages and shows an edge effect, possibly driven by competition mechanisms between species or life stages.
机译：珊瑚礁和海草床通常彼此相邻放置，但对其鱼类群落之间的相互连接程度知之甚少。为了确定珊瑚礁上的珊瑚鱼是否与相邻海草床上的鱼类相互连接或隔离，在印度洋西部桑给巴尔岛上研究了一个60 m的珊瑚礁-海草梯度。使用水下视觉普查，在4个栖息地调查了珊瑚礁鱼类：（1）一块珊瑚礁;（2）与珊瑚礁接壤的海草床;（3）距珊瑚礁边缘30 m的海草床;和（ 4）距珊瑚礁边缘60 m处的海草床。根据4个区域中的未成年人和成年动物的密度，观察到的48个物种分为与珊瑚礁相关的物种，与海草相关的物种，苗圃物种，通才物种和稀有物种。与珊瑚礁相关的物种几乎仅发生在珊瑚礁和礁石-海草边缘，而与海草相关的物种几乎仅发生在海草床上。 3个海草区域都出现了通才和与海草相关的物种，但随着与礁石距离的增加，海草床上的通才的密度降低，而与海草相关的物种的密度增加。与礁石有关的通才种表现出边缘效应，其中靠近礁石边缘的海草床上的密度高于较远处的海草床上的密度。海草床上苗圃物种的幼体密度也随着与珊瑚礁距离的增加而增加，而它们的成年动物在珊瑚礁上的密度最高，这表明从海草床到珊瑚礁的可能的个体发育转变。本研究的结果表明，这种海草-珊瑚礁景观具有物种与生命阶段之间栖息地隔离的特征，并表现出边缘效应，这可能是由物种或生命阶段之间的竞争机制驱动的。

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