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Influencing the way they compete: Exotic predator mediated non-consumptive effects on two co-occurring freshwater snails
Aquatic Ecology ( IF 1.8 ) Pub Date : 2021-11-17 , DOI: 10.1007/s10452-021-09918-6
Pranesh Paul 1 , Debasish Mondal 1 , Gautam Aditya 1
Affiliation  

Worldwide trade of the carnivorous snail Anentome helena may result in its chance dispersal from aquaria to the natural habitats. In course of consuming the invasive snail Physella acuta and the native snail Racesina luteola, selectively, A. helena can weaken the competitive interactions and elicit non-consumptive effects (NCEs) as well. To determine the NCEs on R. luteola and P. acuta, induced by the exotic A. helena, we observed the life-history trait variations due to competition, presence of A. helena and its cues. Since the prey snails were not exposed to such exotic predators, the resultant response will help to evaluate the prospective differences in the evasion and vulnerability of the interacting native and exotic snails. We initiated the experiment using freshly hatched R. luteola and P. acuta by placing them into intra and interspecific competitions. Furthermore, the experimental containers were divided into three treatment levels: control, presence of predator cues and A. helena. We did not find any alteration in the number of days required to attain the sexual maturity of both prey snails due to competition or predator treatments. Although R. luteola had no effects of competition; the body mass and fecundity were negatively affected by the presence of A. helena and its cues. However, the strong effect of intraspecific competition on P. acuta was weakened through increased length, body mass, and fecundity under the presence of A. helena. Therefore, the probable introduction of A. helena may indirectly affect the life-history parameters of both prey and favour P. acuta over R. luteola in the freshwater habitats of West Bengal, India.



中文翻译:

影响它们的竞争方式:外来捕食者介导的对两种同时发生的淡水蜗牛的非消耗性影响

食肉蜗牛Anentome helena 的全球贸易可能会导致其从水族馆扩散到自然栖息地。在食用侵入性蜗牛Physella acuta和本地蜗牛Racesina luteola 的过程中,有选择地,A . helena可以削弱竞争性相互作用并引发非消费效应 (NCE)。为了确定由外来A. helena诱导的R. luteolaP. acuta的 NCE 我们观察了由于竞争和A. helena 的存在而导致的生活史特征变化和它的线索。由于猎物蜗牛没有暴露于这种外来捕食者,因此产生的反应将有助于评估相互作用的本地和外来蜗牛在逃避和脆弱性方面的预期差异。我们使用新鲜孵化的R. luteolaP. acuta通过将它们置于种内和种间竞争中来启动实验。此外,实验容器分为三个处理级别:控制、捕食者线索和A. helena 的存在。由于竞争或捕食者的治疗,我们没有发现两只猎物蜗牛达到性成熟所需的天数有任何变化。虽然R. luteola没有竞争的影响;A. helena及其提示的存在对体重和繁殖力产生负面影响。然而,在A. helena存在下,种内竞争对P. acuta的强烈影响会因长度、体重和繁殖力的增加而减弱。因此,在印度西孟加拉邦的淡水栖息地,可能引入A. helena可能会间接影响猎物和偏爱P. acuta 而不是R. luteola的生活史参数。

更新日期:2021-11-18
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