1. The effects of timber harvest in the moist coniferous forests of western North America are not well documented for ecologically important arthropods such as moths.
2. We assessed the response of macromoth community structure (abundance, sample size-corrected estimates of species richness and diversity, and overall community composition) to time since deforestation at 20 previously logged sites (1–95 years post-harvest), and compared the macromoth communities at these stands to four old growth stands.
3. As stand age increased following timber harvest, the number of macromoths captured in ultraviolet light traps increased and the relative abundance of dietary generalists declined, but sample size-corrected estimates of species richness and diversity did not vary. Macromoth community composition of the youngest stands (<10 years post-harvest) differed markedly from each other but converged soon thereafter.
4. Macromoth communities at old growth sites featured higher capture rates, lower dominance by dietary generalists, and higher sample size-corrected estimates of species richness and diversity than at previously logged sites. Community composition profiles for old growth sites differed from all previously logged sites, but the differences were subtle except in comparison to the youngest logged sites. None of the 188 species we sampled were old growth specialists.
5. Our results reveal dramatic initial impacts of deforestation on macromoth communities in moist coniferous forests of western North America. Such effects are largely reversed within two decades post-harvest but some effects persist for at least 95-years following logging.

中文翻译：

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华盛顿州西北部（美国）管理森林中大蛾群落结构沿 95 年收获后时间序列，与旧森林群落比较

1. 在北美西部潮湿的针叶林中采伐木材对生态重要的节肢动物（如飞蛾）的影响没有得到很好的记录。
2. 我们评估了自森林砍伐以来的 20 个先前记录地点（收获后 1-95 年）的大型蛾类群落结构（丰富度、样本量校正的物种丰富度和多样性估计值以及总体群落组成）的响应，并比较了大型蛾类这些看台上的社区到四个旧的增长看台。
3. 随着木材采伐后林分年龄的增加，紫外线陷阱中捕获的巨蛾数量增加，饮食通才的相对丰度下降，但物种丰富度和多样性的样本大小校正估计没有变化。最年轻的林分（收获后 <10 年）的大蛾群落组成彼此显着不同，但此后很快就收敛了。
4. 与以前记录的地点相比，旧生长地点的大蛾群落具有更高的捕获率，饮食通才的优势较低，以及对物种丰富度和多样性的样本量校正估计值更高。老增长站点的社区组成概况与所有以前登录的站点不同，但除了与最年轻的登录站点相比，差异很小。我们采样的 188 个物种中没有一个是古老的生长专家。
5. 我们的研究结果揭示了森林砍伐对北美西部潮湿针叶林中巨蛾群落的巨大初始影响。这种影响在收获后的 20 年内基本逆转，但有些影响在采伐后至少会持续 95 年。