Assessing the environmental variables that influence freshwater bivalve filtration activity is key to better understand the functioning of stream ecosystems. In the present study, the effects of light (0 ± 0 µmol m⁻² s⁻¹ and 19 ± 2 µmol m⁻² s⁻¹) and temperature (10, 15, 20 and 25°C) on the clearance rates of two bivalve species: the Asian clam Corbicula fluminea (Cyrenidae) and pocketbook Lampsilis ovata (Unionidae) were assessed under controlled laboratory conditions at two different concentrations of algal food (i.e., 10,000 cells ml⁻¹ and 100,000 cells ml⁻¹). Clearance rates for C. fluminea varied from 0 to 491 ml g⁻¹ h⁻¹, while the observed range for L. ovata was 0 to 905 ml g⁻¹ h⁻¹. We found that the relative contribution of the tested variables was species-dependent. While temperature plays a major role in the clearance rates of C. fluminea, food concentration was the most significant variable in the clearance rate of L. ovata. Our results confirm the complex interactions between abiotic and biotic factors in freshwater bivalve filtration activity. Overall, clearance rates are highly variable especially in C. fluminea and presumably regulated by other untested factors suggesting high plasticity in filtration.

评估影响淡水双壳类过滤活动的环境变量是更好地了解河流生态系统功能的关键。在本研究中，光（0±0 µmol m ^-2 s ^-1和19±2 µmol m ^-2 s ^-1）和温度（10、15、20和25°C）对清除率的影响。 2双壳类种：亚蛤河蚬（Cyrenidae）和钱袋美丽蚌属ovata的（蚌）在两种不同浓度的藻食品控制的实验室条件下进行评估（即，10,000个细胞毫升^-1和100,000个细胞毫升^-1）。流感梭菌清除率从0至491ml g ^-1 h ^-1变化，而卵形乳酸杆菌的观察范围为0至905 ml g ^-1 h ^-1。我们发现，测试变量的相对贡献取决于物种。虽然温度在氟梭菌的清除率中起着重要作用，但食物浓度是卵形梭菌清除率的最大变量。我们的结果证实了淡水双壳类生物过滤活动中非生物和生物因子之间的复杂相互作用。总体而言，清除率变化很大，尤其是在C. fluminea中，并且可能受其他未经测试的因素调节，表明过滤的可塑性高。