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潭江鱼类群落组成及资源评价

Keywords: 潭江,群落组成,优势种,G-F指数

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Abstract:

2010年11月、2011年3月和2011年7月3个水情期对潭江流域的鱼类物种多样性和渔获物开展了野外调查,共采集到鱼类80种,隶属于10目26科64属,可划分为淡水种、河口性和洄游性.其中,鲤形目(Cypriniformes)和鲈形目(Perciformes)鱼类各占潭江鱼类总数的51.25%和30.00%.潭江鱼类上层、中上层、中下层和底层的优势类群分别是鲦(Hemiculterleucisculus)、鲮(Cirrhinamolitorella)、点线银鮈(Squaliduswolterstorffi)、广东鲂(Megalobramahoffmanni)、鲫(Carassiusauratus)、鲤(Cyprinuscarpio);河口处潮汐时(冬季)优势种为七丝鲚(Coiliagrayi)、岐尾斗鱼(Macropodusopercularis)、月鳢(Channaasiatica)、梭鱼(Lizahaematocheila)、舌鰕虎鱼(Glossogobiusgiuris).G-F多样性指数分析显示,恩平、赤坎镇和荻龙桥的DF指数、DG指数和G-F指数均较高,表明恩平、赤坎和荻龙桥在鱼类科、属水平上拥有相对较高的鱼类多样性.圣堂、君堂、牛湾和新会的DG指数、DF指数和G-F指数均较低,这与它们拥有较多的单种科和单属科相一致.潭江鱼类多样性主要体现为科、属水平上.

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