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首页> 外文期刊>Ecological research >Dietary differences between grasshoppers are associated with life history tradeoffs in an alpine meadow
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Dietary differences between grasshoppers are associated with life history tradeoffs in an alpine meadow

机译：蚱蜢之间的膳食差异与高山草地的生活历史权衡相关联

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Dietary differences are often observed among generalist herbivores co-occurring in the same community. However, the factors underlying the differences remain poorly understood. In the context of insect herbivores, we hypothesized that interspecific dietary differences are associated with life history traits. Specifically, we hypothesized that the size of wings as well as gender participate in defining dietary preferences, that is, long-winged species and males will tend to forage on plants with high C/N to maximize dispersal and mating, whereas short-winged species and females will forage on N-rich plants to maximize egg production. We tested this hypothesis by examining the diets of the males and females of three long-winged and two short-winged grasshopper species in an alpine meadow. The dietary composition and relative abundance of each species were determined using DNA meta-barcoding. The data showed that the consumed plant species were similar among all of the grasshopper species and between the males and females. However, quantitative differences in the diets were significant between the long-winged and short-winged guilds and between the males and females of each species. Consistent with the hypothesis, (1) the long-winged species fed more on monocots with high C/N, whereas the short-winged species fed more on legumes with high N contents, (2) for each short-winged species the males fed more on monocots with high C/N compared to the females, and (3) across all grasshopper species, egg numbers were positively associated with the weighted dietary N. These data indicate that the dietary preferences of these generalist grasshoppers are associated with life history tradeoffs.
机译：在同一社区中共同发生的总体食草动物中经常观察到膳食差异。然而，差异的因素仍然明白很差。在昆虫草食虫的背景下，我们假设三种饮食差异与生命历史特征有关。具体而言，我们假设翅膀的大小以及性别参与定义膳食偏好，即长翼物种和雄性将倾向于高C / N的植物觅食，以最大化分散和交配，而短翼物种和女性将觅食富核植物，以最大化鸡蛋生产。我们通过在高山草地上检查三个长翅和两个短翅蚱蜢物种的男性和女性的饮食来测试这一假设。使用DNA Meta-Barcoding测定每种物种的膳食组成和相对丰度。数据显示，消耗的植物物种在所有蚱蜢物种和男性和女性之间都相似。然而，饮食中的定量差异在长翼和短翼的公会之间以及每种物种的男性和女性之间是显着的。与假设一致，（1）长翼物种在具有高C / N的单胶质中喂养更多，而短翼物种在具有高N含量的豆类上喂养更多，每条短翼物种喂养的男性更多关于具有高C / N的单子叶，与女性，（3）在所有蚱蜢物种上，蛋数与加权膳食N呈正相关。这些数据表明这些通用蚱蜢的膳食偏好与人寿历史权衡相关联。

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