Weak latitudinal gradients in insect herbivory for dominant rangeland grasses of North America.,Ecology and Evolution

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Weak latitudinal gradients in insect herbivory for dominant rangeland grasses of North America.
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-05-26 , DOI: 10.1002/ece3.6374
Dylan R Kent ₁ , Joshua S Lynn _{1,

2} , Steven C Pennings ₃ , Lara A Souza ₄ , Melinda D Smith ₅ , Jennifer A Rudgers ₁

Affiliation

Patterns of insect herbivory may follow predictable geographical gradients, with greater herbivory at low latitudes. However, biogeographic studies of insect herbivory often do not account for multiple abiotic factors (e.g., precipitation and soil nutrients) that could underlie gradients. We tested for latitudinal clines in insect herbivory as well as climatic, edaphic, and trait‐based drivers of herbivory. We quantified herbivory on five dominant grass species over 23 sites across the Great Plains, USA. We examined the importance of climate, edaphic factors, and traits as correlates of herbivory. Herbivory increased at low latitudes when all grass species were analyzed together and for two grass species individually, while two other grasses trended in this direction. Higher precipitation was related to more herbivory for two species but less herbivory for a different species, while higher specific root length was related to more herbivory for one species and less herbivory for a different species. Taken together, results highlight that climate and trait‐based correlates of herbivory can be highly contextual and species‐specific. Patterns of insect herbivory on dominant grasses support the hypothesis that herbivory increases toward lower latitudes, though weakly, and indicates that climate change may have species‐specific effects on plant–herbivore interactions.

中文翻译：

北美主要牧场草类昆虫食草性的弱纬度梯度。

昆虫的食草模式可能遵循可预测的地理梯度，低纬度地区的食草性更强。然而，昆虫食草的生物地理学研究通常没有考虑可能构成梯度的多种非生物因素（例如降水和土壤养分）。我们测试了昆虫食草的纬度梯度以及食草的气候、土壤和性状驱动因素。我们对美国大平原 23 个地点的 5 种主要草类的食草性进行了量化。我们研究了气候、土壤因素和性状作为草食性相关因素的重要性。当所有草类一起分析以及单独分析两种草类时，低纬度地区的草食性增加，而另外两种草类则朝这个方向发展。较高的降水量与两个物种的食草性较强有关，而另一种物种的食草性较低，而比根长度较高则与一种物种的食草性较多而另一种物种的食草性较少有关。综上所述，结果强调，草食性的气候和性状相关性可能具有高度的背景和物种特异性。优势草类上昆虫的食草模式支持了这样的假设，即食草性向低纬度地区增加（尽管较弱），并表明气候变化可能对植物与食草动物的相互作用产生物种特异性影响。

更新日期：2020-07-25

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