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首页> 外文期刊>Marine ecology progress series >Mangroves and seagrass beds do not enhance growth of early juveniles of a coral reef fish
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Mangroves and seagrass beds do not enhance growth of early juveniles of a coral reef fish

机译：红树林和海草床不能促进珊瑚礁鱼类早期幼体的生长

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Mangroves and seagrass beds have long been considered important nursery grounds for various species of juvenile reef fishes due to their higher abundances in these habitats compared to coral reefs. It is assumed that these putative nurseries provide juveniles with more shelter, higher food availability and higher growth and survival rates than on the reef. However, this nursery function is still ambiguous, and few experimental field studies have tested this hypothesis in these tropical habitats. In the present study, the growth rate of juvenile Haemulon flavolineatum and the availability of its preferred food were determined in seagrass, mangrove and coral reef habitats. It was hypothesized that somatic growth rates as well as the amount of preferred food are higher within these putative nurseries than on the reef (according to the nursery hypothesis). The growth of small juveniles (3.5 to 4.2 cm total length, TL) was studied at 2 Caribbean islands using in situ experimental growth cages. Gut content analysis of the caged fishes showed that Cppepoda were by far the most consumed food items by juveniles in all 3 habitats. Copepoda in the plankton samples were more abundant on the reef than in the mangrove/seagrass habitats. Growth rates of fishes showed the same pattern: higher growth rates in length and weight (significant for Aruba, a trend for Curacao), and a higher weight-length ratio on the reef compared to the mangrove/seagrass habitats. Based on these observations it appears that the coral reef would be a more suitable habitat for small juveniles, when not taking other factors such as predation risk into account. Nevertheless, the highest juvenile fish abundances are found in mangrove/seagrass nurseries where predation risk, but also growth rate, is lower. Therefore, it appears that a tradeoff exists between food abundance/ growth rate and predation pressure/mortality risk, where fish select habitats that minimise the ratio of mortality risk to growth rate.
机译：红树林和海草床长期以来一直被视为各种幼礁鱼类的重要育苗场，因为它们在这些生境中的丰度比珊瑚礁高。假定这些假定的托儿所为青少年提供了比礁石上更多的庇护所，更高的食物供应量以及更高的生长率和存活率。然而，这种育儿功能仍然是模棱两可的，很少有实验田间研究在这些热带生境中检验这一假设。在本研究中，确定了海草，红树林和珊瑚礁栖息地中幼年黄海棠的生长速度及其首选食物的可用性。据推测，在这些假定的苗圃中，体细胞生长速率以及所偏爱的食物的数量要比在珊瑚礁上高（根据苗圃的假设）。使用原位实验性生长笼，研究了两个加勒比小岛屿（总长3.5至4.2厘米，TL）的生长。对笼养鱼的肠含量分析表明，在所有这三个栖息地中，Cppepoda是迄今为止幼鱼消耗最多的食物。浮游生物样本中的pe足目在珊瑚礁上比在红树林/海草生境中丰富。鱼类的生长率显示出相同的模式：与红树林/海草生境相比，鱼类的长度和重量生长率更高（阿鲁巴（Aruba）显着，库拉索岛（Curacao）呈增长趋势），礁石上的长宽比更高。根据这些观察结果，如果不考虑诸如捕食风险之类的其他因素，看来珊瑚礁将是更适合小型幼体的栖息地。然而，在红树林/海草苗圃中发现了最高的幼鱼丰度，那里的捕食风险和增长率都较低。因此，似乎在食物丰度/增长率与捕食压力/死亡率风险之间存在折衷，其中鱼类选择的生境应使死亡率风险与增长率之比最小。

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