Lescak Emily A, von Hippel Frank A, Lohman Brian K, Sherbick Mary L
Department of Biological Sciences, University of Alaska Anchorage, 3211 Providence Dr., Anchorage AK 99508.
Department of Biological Sciences, University of Idaho, PO Box 443051, Moscow ID 83844.
Ecol Freshw Fish. 2012 Oct 1;21(4):581-587. doi: 10.1111/j.1600-0633.2012.00579.x.
Threespine stickleback () populations that have evolved pelvic girdle reduction are most commonly found in lakes with low dissolved ion concentration, a lack of piscivorous fishes, and abundant macroinvertebrate predators. Researchers have speculated that macroinvertebrates have a propensity to consume prey with pelvic spines. If this is true, perhaps macroinvertebrates use the stickleback's spines to facilitate capture and manipulation. This study tested whether dragonfly naiads differentially prey upon stickleback possessing either a complete or reduced pelvis and documented naiad hunting and capturing behavior. Results from an arena experiment suggest that naiads do not prey more heavily upon individuals with one pelvic phenotype over the other. However, results from trials where the naiads were presented with one stickleback with pelvic spines and another without suggest that naiads prey more heavily upon small stickleback with pelvic spines and large stickleback without pelvic spines and that they adjust their predatory behavior based upon the pelvic phenotype of the prey.
已经进化出骨盆带退化特征的三刺鱼（）种群最常见于溶解离子浓度低、没有食鱼性鱼类且有大量大型无脊椎动物捕食者的湖泊中。研究人员推测，大型无脊椎动物倾向于捕食有骨盆刺的猎物。如果这是真的，那么大型无脊椎动物可能利用三刺鱼的刺来便于捕获和操控。本研究测试了蜻蜓稚虫是否对具有完整或退化骨盆的三刺鱼有不同的捕食偏好，并记录了稚虫的捕猎和捕获行为。一项场地实验的结果表明，稚虫对具有一种骨盆表型的个体的捕食并不比对另一种的更严重。然而，在将一只带有骨盆刺的三刺鱼和另一只没有骨盆刺的三刺鱼展示给稚虫的试验中，结果表明，稚虫对带有骨盆刺的小三刺鱼和没有骨盆刺的大三刺鱼的捕食更严重，并且它们会根据猎物的骨盆表型调整其捕食行为。
