學術資源整合系統-相關推薦
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| 作者 | Chen-Lu Lee, Yen-Hsun Huang, Chia-Yun Chung, Hsing-Juh Lin |
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| 出版日期 | 2014 |
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| 著作名稱 | Tidal variation in fish assemblages and trophic structures in tropical Indo-Pacific seagrass beds
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| 刊名 | Zoological Studies |
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| 卷 | 53 |
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| 期 | 1 |
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| 頁數 | 56 |
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| 被收錄索引 | SCI |
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| 主題 | 動物;植物 |
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| 關鍵字 | Coral reef fish, Seagrass, South China Sea, Stomach content analysis, Tidal cycles, Trophic guilds |
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| 摘要 | Background: Tidal cycle is an important factor which regularly changes coastal fish assemblages in shallow waters.
However, the variations in fish assemblage and trophic structure across tidal cycles in tropical seagrass beds are
rarely discussed. We used underwater visual censuses to quantify fish abundance and diversity from the shallow
intertidal to the subtidal zone during both flood and ebb tides in seagrass beds surrounding the Dongsha Island,
South China Sea. We also recorded fish feeding habits by analyzing stomach contents.
Results: At least 70 fish species were observed in the seagrass beds during the study periods. Fish density and
diversity increased with increasing depths, as well as during flood tides. The intertidal areas were characterized by
more variation in both fish assemblage and trophic structure than the subtidal areas. A cluster analysis identified six
principal feeding groups and invertebrate-feeding carnivores contributed about 70% of the total fish abundance.
The density of herbivores, large-sized carnivores, and piscivores, but not small-sized carnivores, increased during
flood tides. In contrast, detritivores decreased in density during flood tides. A heatmap of habitat usage pattern
revealed that most fish showed a preference for deeper stations and flood tides. Only a minority of fish showed a
preference for shallower stations and ebb tides.
Conclusions: We documented differences in fish assemblage and trophic structure between tides in tropical
seagrass beds. Our results suggest that water depth may account for a significant proportion of the variation. The
deeper water during flood tides support more space for herbivores and high trophic level carnivores to forage in
intertidal meadows. The remaining, non-ebbed seawater columns in the intertidal meadows formed important
temporary refuges for fishes during ebb tides. This study offers new information for fish movements over tidal
cycles in tropical seagrass beds. |
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| 系統號 | NO000007557 |
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