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首页> 外文期刊>Canadian Journal of Zoology >Monopolization of food by zebrafish (Danio rerio) increases in risky habitats
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Monopolization of food by zebrafish (Danio rerio) increases in risky habitats

机译：斑马鱼（Danio rerio）对食物的垄断增加了危险生境

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Dominant zebrafish (Danio rerio) previously have been shown to reduce their monopolization of food when foraging in structurally complex habitats compared with open habitats. Complex habitats may be more difficult to defend but may also be safer. To decouple these effects, we compared aggression and monopolization of food in groups of zebrafish foraging in an open habitat and one with overhead cover, as well as in an open habitat and a complex (vegetated) habitat. Covered and open habitats should have been equally defendable. In our experiments, fish used covered habitats more than open ones, suggesting that the perceived risk of predation was lower in covered habitats. There was no difference in use of vegetated and open habitats, suggesting that these habitats, which should differ in defendability, did not differ in safety. We found that the degree of food monopolization (expressed in the coefficient of variation within groups) at risky feeders was significantly greater in open habitats than in covered, but not vegetated, habitats. We did not find a difference in aggression between habitats. These results indicate that resource monopolization in groups of zebrafish is greater in risky habitats and support the hypothesis that the lower monopolization of food in complex habitats could result from greater safety in those habitats rather than, or in addition to, the reduction in defendability.
机译：以前已经证明，与开放栖息地相比，在结构复杂的栖息地觅食时，主要的斑马鱼（Danio rerio）可以减少其对食物的垄断。复杂的栖息地可能更难以防御，但也可能更安全。为了消除这些影响，我们比较了斑马鱼在开放式栖息地和有顶棚覆盖的斑马鱼，开放式栖息地和复杂（植被）栖息地中觅食的侵略性和垄断性。有盖和开放的栖息地应同样具有可防御性。在我们的实验中，鱼类在遮盖的栖息地中使用的比开阔的栖息地更多，这表明在遮盖的栖息地中被捕食的风险更低。植被生境和开放生境的使用没有区别，表明这些生境应具有不同的防御能力，但在安全性方面也没有不同。我们发现，在开放的生境中，风险饲养者的食物垄断程度（以组内变异系数表示）显着大于有盖但没有植被的生境。我们没有发现生境之间的侵略差异。这些结果表明，斑马鱼组中的资源垄断在危险的栖息地中更大，并且支持以下假设：复杂栖息地中较低的食物垄断可能是由于这些栖息地中的安全性更高，而不是（或除了）降低了防御能力之外。

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