Impacts of selective logging on the oxidative status of tropical understory birds

1. Selective logging is the dominant form of human disturbance in tropical forests, driving changes in the abundance of vertebrate and invertebrate populations relative to undisturbed old-growth forests. 2. A key unresolved question is understanding which physiological mechanisms underlie different responses of species and functional groups to selective logging. Regulation of oxidative status is thought to be one major physiological mechanism underlying the capability of species to cope with environmental changes. 3. Using a correlational cross-sectional approach, we compared a number of oxidative status markers among 15 understory bird species in unlogged and selectively logged forest in Borneo in relation to their feeding guild. We then tested how variation of markers between forest types was associated with that in population abundance. 4. Birds living in logged forests had a higher activity of the antioxidant enzyme superoxide dismutase and a different regulation of the glutathio...1. 选择性采伐（selective logging）是热带森林中占主导地位的人类干扰活动，相较于未受干扰的原始老龄林，其会引发脊椎动物与无脊椎动物种群丰度的改变。 2. 当前存在一项关键未决问题：即探明究竟是哪些生理机制构成了不同物种及功能群对选择性采伐产生差异化响应的基础。现有研究表明，氧化状态调控是支撑物种应对环境变化能力的核心生理机制之一。 3. 本研究采用相关性横断面研究范式，针对婆罗洲（Borneo）地区未采伐林与选择性采伐林中的15种林下鸟类，结合其取食集团（feeding guild）特征，对比分析了多项氧化状态标志物水平。随后，我们进一步检验了不同林型间标志物的变异情况与种群丰度变异之间的相关性。 4. 栖息于采伐林的鸟类，其抗氧化酶超氧化物歧化酶（superoxide dismutase）的活性更高，且对谷胱甘肽的调控模式存在差异。