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首页> 外文期刊>Turkish journal of zoology >Spatial and temporal variations in the species composition and abundance of benthic molluscs along 4 rocky shores of Karachi
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Spatial and temporal variations in the species composition and abundance of benthic molluscs along 4 rocky shores of Karachi

机译：卡拉奇4个多岩石海岸沿岸软体动物物种组成和丰富度的时空变化

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摘要

A total of 97 species of macromolluscs were collected from 4 rocky beaches (Manora, Buleji, Nathiagali, and Cape Monze) along the Karachi coast from December 1993 to December 1995. More species were recorded from Buleji (68) and Manora (63) than from Nathiagali (55) and Cape Monze (57). Gastropods dominated at all 4 of the sites studied. Four species were commonly abundant at all 4 sites: Turbo coronatus, Nerita albicilla, Morula granulata, and Cerithium rubus. The average number of species decreased with an increase in the tidal heights at Manora, Buleji, and Nathiagali, whereas this was greater in the high tidal zone at Cape Monze's rocky shore. The average number of individuals of molluscs was greater in the midtidal zone at the Manora and Buleji rocky shores, whereas it was greater in the low tidal zone at Nathiagali and Cape Monze. Two-way nested analysis of variance showed that the number of individual molluscs was significantly different among zones and among sites in most of the samples. Species richness, diversity, and evenness, however, were not found to be significantly different among zones and sites. Cluster analyses, derived from Bray-Curtis measures of similarity based on abundance data, showed the discrimination between carnivore gastropods and an increase in the abundance of herbivore gastropod molluscs. Differences in community structure amongst sites appeared to be due to habitat structure, substrate instability, human disturbances, and degree of exposure.
机译：从1993年12月至1995年12月，沿着卡拉奇海岸的4个岩石海滩（马诺拉，布勒吉，纳吉亚格利和蒙泽角）共采集了97种大分子。布勒吉（68）和马诺拉（63）记录的物种更多来自Nathiagali（55）和Cape Monze（57）。腹足动物在所有四个研究地点均占优势。在所有四个位置上，共有四个物种共同丰富：涡轮冠虫，白内罗氏猪笼草，桑Mor颗粒和红景天。随着Manora，Buleji和Nathiagali的潮汐高度增加，平均物种数量减少，而在Monze角多岩石海岸的高潮区则更高。软体动物的平均数量在马诺拉（Manora）和布勒吉（Buleji）岩岸的中潮带较大，而在纳吉亚格里（Nathiagali）和孟泽角（Cape Monze）的低潮带则更高。差异的双向嵌套分析表明，大多数样本中的区域之间和部位之间的单个软体动物数量明显不同。然而，在区域和地点之间，物种的丰富度，多样性和均匀性没有显着差异。基于丰度数据的Bray-Curtis相似性测度得出的聚类分析显示，食肉动物腹足纲动物之间的区别和食草动物腹足纲软体动物的丰度增加。地点之间的群落结构差异似乎是由于栖息地结构，基质不稳定，人为干扰和暴露程度所致。

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