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首页> 外文期刊>Marine biology >Predation of calanoid copepods on their own and other copepods' offspring
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Predation of calanoid copepods on their own and other copepods' offspring

机译：自己和其他co足动物的后代对cal足an足动物的捕食

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Predation of eggs and nauplii by adult copepods is often used to explain unexpected death rates in population dynamics studies, but the phenomenon has been rarely investigated or quantified. Therefore, we studied the predatory feeding of adult females (Acartia clausi, Cen-trvpages hamatus, Centropages typicus, and Temora lon-gicornis) on their own and other species' eggs and young nauplii with different densities of single animal-prey, mixtures of animal-prey and in the presence of diatoms. All species preyed on eggs and nauplii of their own and all other species. Maximal egg predation varied between 7 and 64 eggs fem~(-1) day~(-1). Ingestion of Centropages spp. Eggs was lowest, potentially due to the spiny egg surface. Maximal feeding rates on nauplii ranged from 5 to 45 nauplii fem~(-1) day~(-1). T. longicornis preferred eggs, when eggs and nauplii were offered together at the same densities, and the other predators selected for nauplii. At a diatom concentration of 60 μg C l~(-1) predation on eggs by C. typicus was higher than without algae, whereas A. clausi and T. longicornis did not change their uptake of eggs. Feeding on nauplii in the presence of diatoms was again enhanced in C. typicus, and unaffected in A. clausi and C. hamatus. T. longicornis reduced its feeding on nauplii in the presence of diatoms. Calculated predation rates, using field abundances of predators and prey, suggest that predation of copepods on their own young stages may account for ca. 30 % of total mortality of young stages in North Sea cope-pod populations.
机译：成年co足类对卵和无节幼体的捕食经常被用来解释人口动态研究中的意外死亡率，但是这种现象很少被研究或量化。因此，我们研究了成年雌性（A螨，Cen-trvpages hamatus，Centropages typicus和Temora lon-gicornis）的捕食性摄食，它们分别具有不同密度的单个动物-猎物，动物猎物和硅藻的存在。所有物种都以自己和所有其他物种的卵和无节幼体为食。最大卵捕食在7至64个卵fem〜（-1）天〜（-1）之间变化。摄食中心菌属。鸡蛋最低，可能是由于有刺的鸡蛋表面。无节幼体的最大摄食率范围为5至45个无节肢fem〜（-1）天〜（-1）。当以相同的密度同时提供鸡蛋和无节幼体，并且选择其他捕食者进行无节幼体时，T。longicornis则更喜欢鸡蛋。在硅藻浓度为60μgC l〜（-1）的情况下，伤寒梭菌对卵的捕食比没有藻类时要高，而A. clausi和T. longicornis不会改变其对卵的吸收。在硅藻的存在下，以无硅藻为食的无节幼体的摄食再次增强，而在克劳西氏菌和哈密斯氏梭菌中不受影响。在硅藻的存在下，T。longicornis减少了对无节幼体的摄食。利用捕食者和被捕猎物的田间丰度计算出的捕食率表明，pe足类在其幼年阶段的捕食可能占了大约。北海小豆荚种群年轻阶段总死亡率的30％。

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  • 来源
    《Marine biology》 |2014年第4期|733-743|共11页
  • 作者

    Maarten Boersma; Anne Wesche; Hans-Juergen Hirche;

  • 作者单位

    Alfred-Wegener-Institut Helmholtz-Zentrum fuer Polar- und Meeresforschung, Biologische Anstalt Helgoland, Postfach 180, 27483 Helgoland, Germany;

    Alfred-Wegener-Institut Helmholtz-Zentrum fuer Polar- und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany;

    Alfred-Wegener-Institut Helmholtz-Zentrum fuer Polar- und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany;

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