Effects of tethering on predatory escape by juvenile blue crabs
Effects of tethering on predatory escape by juvenile blue crabs
复制标题
拴系对幼年蓝蟹捕食逃逸的影响
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
S. Morgan
中科院分区：
文献类型：
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作者：
R. K. Zimmer;Fielder;K. L. Heck;L. Coen;S. Morgan
本文研究了笼养对青蟹Callinectes sapidus Rathbun幼蟹捕食逃逸的影响。在大型水槽中进行了试验，以模拟自然沉积和低能量河口环境中的开放砂滩的水动力特性。用录像记录青蟹幼蟹（被捕食者）和成蟹（捕食者）之间的行为互动，然后用计算机-录像运动分析进行量化。被栓系的幼鱼（70%）明显多于未被栓系的幼鱼（10%）。系链对猎物游泳逃逸反应的动力学影响不大。平均速度，最大速度，最大加速度没有显着差异栓系和非栓系青少年。但是，被栓系的幼鱼在爆发性的摆动中行进的距离较短，以逃避捕食性的成年鱼，而且它们无法逃避持续的攻击者。而拴系是用来评估相对速度的捕食，它增加了脆弱性的猎物生物体的攻击。捕食率将最膨胀的高度移动的猎物，有效地逃避捕捉时，他们没有约束。强烈鼓励调查人员量化拴系对猎物逃跑和生存的影响。
: Effects of tethering on predatory escape by juvenile blue crabs Callinectes sapidus Rathbun were exam-ined. Trials were conducted in a large flume to simulate the natural sedimentary and hydrodynamic properties of open sand flats in low-energy estuarine environments. Behavioral interactions between juvenile (prey) and adult (predator) blue crabs were video recorded, then quantified by cornputer- video motion analysis. Sig~uficantly more tethered juveniles (70%) were captured by adults than non-tethered juveniles (10%). Kinematics of the prey swimming escape response changed little as a result of the tether. Mean velocity, maximum velocity, and maximum acceleration did not differ significantly between tethered and non-tethered juveniles. But tethered juveniles traveled shorter distances during bursts of sw~rnrning to escape predatory adults, and they could not evade persistent attackers. Whereas tethering is used to assess relative rates of predation, it increases vulnerability of prey organisms to attack. Predation rates will be most inflated for highly mobile prey that effectively evade capture when they are not restrained. Investigators are strongly encouraged to quantify the impacts of tethering on prey escape and survivorship.