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湖泊科学  2008 

太湖椭圆萝卜螺的食物来源分析

DOI: 10.18307/2008.0312

Keywords: 椭圆萝卜螺(Radixswinhoei),食物来源,附着生物,沉水植物

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Abstract:

椭圆萝卜螺(Radixswinhoei)是太湖常见螺类,能牧食附着生物与多种水生植物.对植食性螺类而言,食物的主要来源究竟是水生植物还是附着生物尚存在争议.以来自太湖的苦草、轮叶黑藻、附着生物及混合食物(苦草+轮叶黑藻+附着生物)作为椭圆萝卜螺的四组食物,通过两个月的室内养殖实验,根据椭圆萝卜螺的生长指标来分析其主要食物来源.结果表明:以苦草、轮叶黑藻为食物时,椭圆萝卜螺的成活率(成螺)、特定生长率(幼螺与成螺)均显著低于附着生物、混合食物,食物种类对幼螺成活率的影响则不显著.另外,食物种类对幼螺壳长的增长有显著影响,在牧食两种水生植物后,幼螺平均每天壳长增长在0.01-0.02mm之间,而牧食附着生物与混合食物后每天增长0.05mm以上.分析认为,椭圆萝卜螺尽管牧食水生植物,但附着生物仍是其主要的食物来源,并对其原因进行了初步探讨.

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