Small mammal community maintains stability through compensatory dynamics after restoration of a ponderosa pine forest
Small mammal community maintains stability through compensatory dynamics after restoration of a ponderosa pine forest
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黄松林恢复后，小型哺乳动物群落通过补偿动态保持稳定
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. Covington
中科院分区：
文献类型：
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作者：
E. Kalies;W. Covington
在过去的几十年里，生态系统稳定性越来越受到关注，因为它有助于预测人为干扰对生态系统的影响。物种可能通过补偿表现出稳定性，种群数量每年都有很大的波动，但随着时间的推移，密度反应一致。当具有相似功能作用的物种通过对环境变化的不同反应相互补偿时，稳定性就会增加。在恢复项目中，目标是通过改变生态系统的组成、结构和功能以类似于自然（“参考”）条件来恢复稳定性。我们评估了生态恢复治疗的成功，通过检查治疗前后的小型哺乳动物群落的结构和功能的反应，并与参考条件进行比较。我们使用罗伊尔密度模型来研究的8种小型哺乳动物恢复（间伐）处理黄松林，以确定社会保持总密度，生物量和功能（代表外生菌根真菌分散）干扰后的反应。处理后6年的群落组成各不相同，但总密度和生物量保持不变，表明群落是捕食者稳定的猎物基地。此外，goldenmantled地松鼠（Spermophilus lateralis）和灰领花栗鼠（Tamias cinereicollis）似乎发挥了类似的作用，分散外生菌根真菌在不同的森林结构。总物种密度和生物量都大于间伐后，在未间伐林分，并与参考林分相似。这些结果表明，虽然物种组成的变化，每年干扰后，恢复治疗可以维持生态系统的稳定性，在小型哺乳动物群落水平的属性。
Ecosystem stability has been of increasing interest in the past several decades as it helps predict the consequences of anthropogenic disturbances on ecosystems. Species may exhibit stability through compensation, with greatly fluctuating populations year to year but a consistent density response over time. Stability is increased when species with similar functional roles compensate for one another by responding differently to environmental change. In restoration projects, the objective is to restore stability by altering ecosystem composition, structure, and function to resemble natural (‘‘reference’’) conditions. We assessed the success of ecological restoration treatments by examining the structural and functional responses of the small mammal community before and after treatment, and compared to reference conditions. We used Royle density models to examine the responses of eight species of small mammals to restoration (thinning) treatments in ponderosa pine forests to determine if the community maintained total density, biomass, and function (represented by ectomycorrhizal fungi dispersion) after disturbance. Community composition differed in each of 6 years following treatment, but total density and biomass remained constant, suggesting the community is a stable prey base for predators. In addition, goldenmantled ground squirrels (Spermophilus lateralis) and gray-collared chipmunks (Tamias cinereicollis) appeared to play a similar role in dispersing ectomycorrhizal fungi across different forest structures. Both total species density and biomass were greater after thinning than in unthinned stands, and were similar to reference stands. These results suggest that although species composition changes from year to year after disturbance, restoration treatments can maintain ecosystem stability in terms of small mammal community-level properties.