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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial and temporal patterns of seagrass habitat use by fishes at the Ryukyu Islands, Japan
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Spatial and temporal patterns of seagrass habitat use by fishes at the Ryukyu Islands, Japan

机译：日本琉球群岛鱼类利用海草栖息地的时空格局

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To investigate whether or not regional-temporal patterns of seagrass habitat use by fishes existed at the Ryukyu Islands (southern Japan), visual surveys were conducted in seagrass beds and adjacent coral reefs in northern, central, and southern Ryukyu Islands, in November 2004, and May, August, and November 2005, the northern region having less extensive seagrass beds compared with the central and southern regions. During the study period, the seagrass beds were utilized primarily by 31 species, the densities of some of the latter differing significantly among regions. With the exception of Apogonidae and Holocentridae, all species were diurnal and could be divided into 6 groups based on seagrass habitat use patterns; (1) permanent residents A (10 species, e.g. Stethojulis strigiventer), juveniles and adults living in seagrass beds as well as other habitats; (2) permanent residents B (5 species, e.g. Calotomus spinidens), juveniles and adults living only or mainly in seagrass beds; (3) seasonal residents A (4 species, e.g. Cheilodipterus quinquelineatus), juveniles living in seagrass beds as well as other habitats; (4) seasonal residents B (6 species, e.g. Lethrinus atkinsoni), juveniles living only or mainly in seagrass beds; (5) transients (5 species, e.g. Parupeneus in-dicus), occurring in seagrass beds in the course of foraging over a variety of habitats; and (6) casual species (1 species, Acanthurus blochii), occurring only occasionally in seagrass beds. Regarding temporal differences, juvenile densities in each group were high in May and August compared with November in each region, whereas adult densities did not differ drastically in each month. For regional differences, juvenile and adult densities of permanent residents A and B were higher in the southern and central regions than in the northern region. Moreover, some seasonal residents showed possible ontogenetic habitat shift from seagrass beds to coral reefs in each region. These results indicated that seagrass habitat use patterns by fishes changed temporally and regionally and there may be habitat connectivity between seagrass beds and coral reefs via ontogenetic migration in the Ryukyu Islands.
机译：为了调查琉球群岛（日本南部）是否存在鱼类利用海草栖息地的时空格局，于2004年11月在琉球北部，中部和南部的海草床和邻近的珊瑚礁中进行了视觉调查， 2005年5月，8月和2005年11月，北部地区的海草床数量少于中部和南部地区。在研究期间，海草床主要被31种物种利用，其中某些区域的密度显着不同。除无杆线虫科和全缘科外，所有物种均为昼夜节律，根据海草栖息地的使用方式可分为6类。 （1）居住在海草床及其他栖息地的永久居民A（10种，例如Stethojulis strigiventer），少年和成年人; （2）仅或主要生活在海草床中的永久居民B（5种，例如Calotomus spinidens），少年和成年人; （3）季节性居民A（4种，例如Chemilodipterus quinquelineatus），生活在海草床上的幼鱼以及其他生境； （4）季节性居民B（6种，例如Lethrinus atkinsoni），仅或主要生活在海草床中的幼体; （5）在各种生境中觅食的过程中在海草床中发生的瞬态现象（例如，印度对-5种）； （6）偶然种（1种，Acanthurus blochii），仅偶尔出现在海草床上。关于时间上的差异，各地区的五月和八月青少年密度较高，而十一月份则高于十一月，而成年人的密度在每个月均没有显着差异。就区域差异而言，南部和中部地区永久居民A和B的青少年和成年人密度高于北部地区。此外，在每个地区，一些季节性居民显示可能的自生栖息地从海草床向珊瑚礁转移。这些结果表明，鱼类在海草栖息地的使用方式在时间和区域上都发生了变化，并且在琉球群岛上，海草床和珊瑚礁之间通过生源迁移可能存在栖息地连通性。

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