Brendelberger H, Jürgens S
Zoologisches Institut, Physiologische Ökologie, Universität zu Köln, Weyertal 119, W-5000, Köln 41, Germany.
Oecologia. 1993 May;94(1):36-42. doi: 10.1007/BF00317298.
The suspension feeding of Bithynia tentaculata was tested in laboratory experiments. The animals were fed in 1-1 aerated glass beakers, and filtration rates were calculated from changes in cell concentrations during the 6-h experiment. Temperature influenced the filtering rate, with minimum values of 5ml · ind · h at 5° C and maxima of 17.2 ml · ind · h at 18° C. Three food species of different size, motility and cell surface characteristics (Chlamydomonas reinhardii, Chlorella vulgaris and Chlorogonium elongatum) did not affect filtration rates. Suspension feeding increased with increasing food concentrations up to 12 nl · ml, above which feeding rate was kept constant by lowering the filtering rates. Even the smallest animals tested (<4 mm body length) were found to be feeding on suspended food at a rate of 2.7 ml · ind · h, and increasing rates up to 8.4 ml were found in the 6-7 mm size class. All size classes of Bithynia showed a circannual fluctuation of their filtration rates. The ecological consequences of Bithynia's ability to switch between two feeding modes, grazing and suspension feeding, are discussed.
在实验室实验中对 Tentaculata 沼螺的悬浮取食进行了测试。将动物置于1:1通气的玻璃烧杯中饲养，并根据6小时实验期间细胞浓度的变化计算滤过率。温度影响滤过率，5℃时最小值为5毫升·个体·小时，18℃时最大值为17.2毫升·个体·小时。三种具有不同大小、运动性和细胞表面特征的食物种类（莱茵衣藻、普通小球藻和细长绿球藻）并未影响滤过率。悬浮取食随着食物浓度增加至12纳升·毫升而增加，超过该浓度后通过降低滤过率使取食率保持恒定。即使是测试的最小个体（体长<4毫米）也被发现以2.7毫升·个体·小时的速率取食悬浮食物，在6-7毫米大小等级中发现取食率增加至8.4毫升。所有大小等级的沼螺都表现出滤过率的周年波动。讨论了沼螺在两种取食模式（啃食和悬浮取食）之间转换能力的生态后果。
