摘要
报道了2005年7～9月在太湖试验基地进行的椭圆萝卜螺对沉水植物牧食的实验结果.结果表明,椭圆萝卜螺对3种沉水植物的平均牧食率为7.87mg·g^-1·d^-1,其中对苦草的牧食率最高（13.63 mg·g^-1·d^-1）,马来眼子菜次之（9.66mg·g^-1·d^-1）,轮叶黑藻最低（0.31mg·g^-1·d^-1）,且牧食率与螺规格呈显著负相关.椭圆萝卜螺对沉水植物的牧食具有选择性,喜食苦草而较少选食其他两种沉水植物.椭圆萝卜螺的食物选择性能力与其规格有关,随着生长对沉水植物的选择性加强.探讨了椭圆萝卜螺对沉水植物的选食机理.
Radix swinhoei （H. Adams） is a freshwater snail commonly found in shallow regions of Taihu Lake. These snails often are observed associating with aquatic plants and can graze some macrophytes. This research estimated consumption rates of Radix swinhoei on three young submerged plants （ Vallisneria spiralis, Hydrilla verticillata and Potamogeton malaianus ） in laboratory experiments. The snail consumed V. spiralis at the highest rate （13.63 mg·g^-1·d^-1 ）, P. malaianus at a lower rate （9.66mg·g^-1·d^-1）, and H. verticillata at the lowest rate （0.31mg·g^-1·d^-1）. The consumption rates on V. spiralis varied significantly with snail size （p 〈 0.05）, ranging from 13.63 mg·g^-1·d^-1 for large-sized snails to 143.42mg·g^-1·d^-1 for smallsized ones, and consumption rates generally had a negative correlation to snail size. Radix swinhoei had preferred V, spiralis over H. verticillata and P. malaianus, and the selectivity increased with snail size. The selectivity mechanism of Radix swinhoei on aquatic plants is discussed.
出处
《生态学报》
CAS
CSCD
北大核心
2006年第10期3221-3224,共4页
Acta Ecologica Sinica
基金
国家"863"计划资助项目(2002AA601011-04)
中国科学院知识创新工程重大资助项目(KZCX1-SW-12)~~
关键词
椭圆萝卜螺
牧食
沉水植物
太湖
Radix swinhoei （ H. Adams）
grazing
submerged plants
Taihu Lake
