Behavioural responses to warming differentially impact survival in introduced and native dung beetles
Behavioural responses to warming differentially impact survival in introduced and native dung beetles
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DOI：
10.1111/1365-2656.13366
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发表时间：
2020-10-28
影响因子：
4.8
通讯作者：
Sheldon, Kimberly S.
中科院分区：
文献类型：
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作者：
Mamantov, Margaret A.;Sheldon, Kimberly S.
人为变化通常是孤立地研究的，但可能会相互作用，影响生物多样性。例如，如果气候变化对入侵物种和本地物种产生不同的影响，那么气候变化可能会加剧生物入侵的影响。行为可塑性可能会减轻气候变化的一些影响，但物种的行为可塑性程度不同。特别是，入侵物种可能比本地物种具有更大的行为可塑性，因为可塑性有助于入侵物种在新的环境中建立和传播。这种可塑性可以使入侵物种更好地应对气候变化。我们的目标是检查引进的金龟子和本地的金龟子对变暖的反应是否存在生殖行为和行为可塑性的差异，以及行为差异是如何影响后代存活的。采用重复措施设计，将引入的金牛和本地金龟子的小群体暴露在三种温度处理下，包括对照、低升温和高升温处理，然后测量繁殖行为，包括孵化球的数量、大小和埋深。我们在与孵化球埋深相匹配的发育温度下饲养后代，以量化存活率。我们发现，在所有处理中，引进的金牛比本地的金牛产生更多的孵化球和更大的孵化球，并将孵化球埋得更深。然而，这两个物种对变暖的反应在行为可塑性程度上没有差异。繁殖行为的差异确实影响了存活，例如与引入的牛犊相比，变暖的温度对原生的oHecate的后代的存活的影响更大。总体而言，我们的结果表明，本地和引入物种之间的行为差异是气候变化可能加剧生物入侵的负面影响的机制之一。
Anthropogenic changes are often studied in isolation but may interact to affect biodiversity. For example, climate change could exacerbate the impacts of biological invasions if climate change differentially affects invasive and native species. Behavioural plasticity may mitigate some of the impacts of climate change, but species vary in their degree of behavioural plasticity. In particular, invasive species may have greater behavioural plasticity than native species since plasticity helps invasive species establish and spread in new environments. This plasticity could make invasives better able to cope with climate change.Here our goal was to examine whether reproductive behaviours and behavioural plasticity vary between an introduced and a native Onthophagus dung beetle species in response to warming temperatures and how differences in behaviour influence offspring survival.Using a repeated measures design, we exposed small colonies of introduced O. taurus and native O. hecate to three temperature treatments, including a control, low warming and high warming treatment, and then measured reproductive behaviours, including the number, size and burial depth of brood balls. We reared offspring in their brood balls in developmental temperatures that matched those of the brood ball burial depth to quantify survival.We found that the introduced O. taurus produced more brood balls and larger brood balls, and buried brood balls deeper than the native O. hecate in all treatments. However, the two species did not vary in the degree of behavioural plasticity in response to warming. Differences in reproductive behaviours did affect survival such that warming temperatures had a greater effect on survival of offspring of native O. hecate compared to introduced O. taurus.Overall, our results suggest that differences in behaviour between native and introduced species are one mechanism through which climate change may exacerbate negative impacts of biological invasions.