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首页> 外文期刊>Pedobiologia >The influence of microclimate on foraging and sheltering behaviours of terrestrial isopods: Implications for soil carbon dynamics under climate change
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The influence of microclimate on foraging and sheltering behaviours of terrestrial isopods: Implications for soil carbon dynamics under climate change

机译：小气候对陆生等足类动物觅食和掩蔽行为的影响：气候变化对土壤碳动态的影响

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摘要

In south east England climate change is predicted to include decreases in periodicity of rainfall events during summer, resulting in more, longer periods of drought. In many temperate regions these changes will affect foraging strategies of soil animals, including arthropod macro-decomposers such as terrestrial isopods. We investigated activity budgets under drier (50%) and moisture (90%) relative humidity conditions, for three species: Porcellio scaber, Oniscus asellus and Armadillidium vulgare, representing three families, which have different morphological adaptations to the terrestrial environment. In the drier environment all three species spent more time sheltering, less time feeding and less time in other activities. Costs of foraging were estimated by monitoring loss of body mass for 7. h. This loss was twice as high under the lower humidity regime. On the basis of morphological traits, two members of the Oniscidae: O. asellus and Philoscia muscorum, differing in eco-morphological strategies, were predicted to be more susceptible to desiccation than members of the Porcellionidae or Amadillidiidae. Members of the Oniscidae lost mass most quickly and also suffered higher mortality in the drier atmosphere. A cost of spending more time sheltering was that consumption of high quality food by Porcellio scaber was significantly reduced in the drier environment. The trade-off between energy gain by feeding and increased probability of survivorship by sheltering, is illustrated using an isopleth model. Changes in the extent to which the soil fauna will stimulate microbial metabolism and hence soil carbon dioxide emissions, under future conditions of climate change are predicted.
机译：在英格兰东南部，预计气候变化将包括夏季降雨事件的周期性减少，从而导致更长，更长时间的干旱。在许多温带地区，这些变化将影响土壤动物的觅食策略，包括节肢动物的大型分解器，如陆地等足动物。我们调查了干燥（50％）和相对湿度（90％）的相对湿度条件下三种物种的活动预算：波氏梭毛虫，尖角鬼臼和寻常型Armadillidium v​​ulgare，它们代表了三个科，它们对陆地环境的形态适应不同。在较干燥的环境中，所有这三种物种花费更多的时间躲避，更少的觅食时间和更少的其他活动时间。通过监测体重下降7小时来估算觅食成本。在较低的湿度条件下，这种损失是原来的两倍。根据形态学特征，在生态形态学策略上不同的Oniscidae的两个成员：O。asellus和黏膜Philoscia muscorum比Porcellionidae或Amadillidiidae的成员更容易干燥。 Oniscidae的成员失去质量最快，并且在干燥的大气中也遭受更高的死亡率。花费更多时间庇护的代价是，在干燥的环境中，Porcellio scaber食用高品质食物的情况大大减少。使用等体积模型说明了通过摄食获得的能量与通过庇护所增加的生存概率之间的权衡。预计在未来的气候变化条件下，土壤动物会刺激微生物代谢的程度发生变化，从而刺激土壤二氧化碳排放。

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