Effect of Cyclone Aila on estuarine fish assemblages in the Matla River of the Indian Sundarbans
Effect of Cyclone Aila on estuarine fish assemblages in the Matla River of the Indian Sundarbans
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DOI：
10.1017/s026646741200020x
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发表时间：
2012-07-01
影响因子：
1.4
通讯作者：
Homechaudhuri, Sumit
中科院分区：
文献类型：
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作者：
Mukherjee, Sudeshna;Chaudhuri, Atreyee;Homechaudhuri, Sumit
本研究探讨了一个灾难性的气旋（艾拉）对鱼类动物群组合在感潮河的孙德尔班三角洲。在六个站的刺网长度为20米，1厘米的网眼大小的采样导致63种在前艾拉调查收集。其中，16种在气旋后的一年内不可用。然而，12个新的物种被添加到组合在后艾拉年期间，记录了59种。相似性分析（ANOSIM）证实，气旋后的鱼类组合的显着变化，相应的减少物种多样性和丰富的季节性模式的变化。水文参数也不同，养分浓度大幅飙升。耐受低溶解氧似乎是一个决定性因素，从某些鱼类，即Harpadon nehereus，Liza parsia，Pampus argentius，Tenualosa ilisha和Toxotes chatareus在后艾拉年的丰度较高。尽管恢复的鱼类动物组合在后期的研究，强烈的季节性变化是持久的。因此，这项研究表明，环境变化的温度和盐度增加引起更大的反应，在河口社区比临时的自然干扰，甚至严重的旋风。
The present study examined the effect of a catastrophic cyclone (Aila) on ichthyofaunal assemblages in a tidal river of the Sundarban Delta. Sampling in six stations with a gill-net of 20-m length and 1-cm mesh size resulted in the collection of 63 species in a pre-Aila survey. Among them, 16 species were not available in the year after the cyclone. However, 12 new species were added to the assemblages in the post-Aila year during which 59 species were recorded. Analysis of Similarity (ANOSIM) confirmed significant changes in fish assemblages after the cyclone with a corresponding reduction of the species diversity and variation in the seasonal pattern of abundance. Hydrological parameters also differed with a significant surge in nutrient concentrations. Tolerance to low dissolved oxygen seemed to be a determinant factor as evident from the higher abundance of certain fishes viz. Harpadon nehereus, Liza parsia, Pampus argentius, Tenualosa ilisha and Toxotes chatareus during post-Aila year. Despite the recovery of the ichthyofaunal assemblages at the later stage of the study, a strong seasonal variation was persistent. The study therefore suggests that environmental variation in terms of increasing temperature and salinity elicit greater response in an estuarine community than temporary natural disturbances even as severe as cyclones.