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首页> 外文期刊>Marine biology >Effects of simulated sublethal predation on the growth and regeneration rates of a spionid polychaete in laboratory flumes
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Effects of simulated sublethal predation on the growth and regeneration rates of a spionid polychaete in laboratory flumes

机译：模拟亚致死捕食对实验室水槽中蜘蛛状多毛类动物生长和再生速率的影响

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Most spionid polychaetes switch from deposit feeding to suspension feeding as current speed and the flux of suspended food increase. Growth rates of juvenile Polydora cornuta are strongly affected by flow and can be as rapid as 60% day~(-1) in moderate currents. Feeding palps that extend above the sediment-water interface during suspension feeding are especially vulnerable to sublethal predation, but individuals with damaged posteriors are also common. We performed a series of laboratory flume experiments to test the effects of sublethal tissue damage on the growth and regeneration rates of P. cornuta juveniles. Replicated experiments were conducted at three flow speeds in counter-rotating annular flumes containing field-collected sediment and a nonliving algal slurry as deposited and suspended food. In the first set of experiments, we removed 2, 1, or 0 of worms' two feeding palps and measured the relative growth rates of worm bodies and palps after 3 days in the flumes. Worms that lost both palps grew significantly slower than the other two groups, but the growth rate of worms that had one undamaged palp was not significantly different from worms that had two undamaged palps. Faster flow speeds significantly increased rates of body growth, and there was a significant interaction between flow and the effect of palp loss. During the 3-day experiments, damaged palps fully regenerated and often grew larger than they were prior to being removed. Damaged palps also grew significantly faster than undamaged palps. The second set of experiments tested the effects of removing a worm's posterior region (～18% of body volume). The growth rates of these damaged and undamaged worms did not differ significantly. By the end of a 3-day flume experiment, damaged worms had grown 6x larger than they were prior to the posterior damage. The rapid regeneration of damaged palps and posterior tissue in moderate flows that allow suspension feeding suggests that sublethal predation on spionids might be more frequent than previously estimated and will have little impact on the growth of juvenile recruits.
机译：随着当前速度和悬浮食物通量的增加，大多数带齿多毛类动物都从沉积物喂入转变为悬浮物喂入。流动性强烈地影响幼体角Poly的生长速度，在中等水流中，其生长速度可高达60％day〜（-1）。在悬浮喂食期间，在沉积物-水界面上方延伸的喂食触手特别容易受到亚致死捕食，但后代受损的人也很常见。我们进行了一系列的实验室水槽实验，以测试亚致死组织损伤对角斑对虾幼虫生长和再生速率的影响。在三个反向流动的环形水槽中以三种流速进行重复实验，该环形水槽包含田间收集的沉积物和无生命的藻类泥浆，作为沉积和悬浮食物。在第一组实验中，我们去除了蠕虫的两个食饵中的2个，1个或0个，并测量了在水槽中放置3天后蠕虫体和触虫的相对生长速度。失去了两个触角的蠕虫的生长速度明显慢于其他两组，但是具有一个未损坏的触角的蠕虫的生长速度与具有两个未损坏的触头的蠕虫的生长速度没有显着差异。更快的流动速度显着提高了身体的生长速度，并且流动与触觉丧失的影响之间存在显着的相互作用。在三天的实验过程中，受损的手掌完全再生，并且通常长得比被移除前大。损坏的手掌的生长也比未损坏的手掌快得多。第二组实验测试了去除蠕虫的后部区域（约18％的体积）的效果。这些受损和未损坏的蠕虫的增长率没有显着差异。在为期3天的水槽实验结束时，损坏的蠕虫的生长比后部损坏之前长了6倍。中等程度的流动使受损的手掌和后部组织迅速再生，允许悬浮饲料进食，这表明对孢子体的亚致死捕食可能比以前估计的更为频繁，并且对少年新兵的生长几乎没有影响。

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