Tinoco Boris A, Latta Steven C, Astudillo Pedro X, Nieto Andrea, Graham Catherine H
Escuela de Biología Universidad del Azuay Cuenca Ecuador.
National Aviary Allegheny Commons West Pittsburgh Pennsylvania USA.
Biotropica. 2021 Nov;53(6):1673-1684. doi: 10.1111/btp.13016. Epub 2021 Oct 5.
As the pace of environmental change increases, there is an urgent need for quantitative data revealing the temporal dynamics of local communities in tropical areas. Here, we quantify the stability of avian assemblages in the highly threatened, but poorly studied, Andean biodiversity hot spot. We evaluated the temporal variation in species richness and community composition of local bird assemblages in three habitat types (native forest, introduced forest, native shrub) using a unique, relatively long-term data series from Cajas National Park and Mazán Reserve in the southern Andes of Ecuador. We sampled birds with mist nets using a standardized protocol over 11 years, from 2006 to 2016. Species richness remained stable over time across habitats, but community composition changed in the native forest. In particular, we observed taxonomic reordering in the native forest, in which the evenness in the distribution of abundances of taxa decreased over time. This finding is consistent with other studies where species richness remained constant over time while community composition changed. Our study highlights the value of long-term studies in the tropical Andes as we show that species composition of birds in a montane forest is changing, consistent with global trends in biodiversity change.
随着环境变化速度的加快，迫切需要定量数据来揭示热带地区当地群落的时间动态。在此，我们对安第斯生物多样性热点地区高度濒危但研究较少的鸟类群落稳定性进行了量化。我们利用来自厄瓜多尔南部安第斯山脉卡哈斯国家公园和马赞保护区的独特、相对长期的数据系列，评估了三种栖息地类型（原生森林、人工林、原生灌丛）中当地鸟类群落物种丰富度和群落组成的时间变化。我们从2006年到2016年，采用标准化方案，用雾网对鸟类进行了11年的采样。随着时间的推移，各栖息地的物种丰富度保持稳定，但原生森林中的群落组成发生了变化。特别是，我们在原生森林中观察到了分类重排现象，即随着时间的推移，分类单元丰度分布的均匀度下降。这一发现与其他研究一致，即随着时间的推移物种丰富度保持不变，而群落组成发生变化。我们的研究突出了热带安第斯地区长期研究的价值，因为我们表明山地森林中鸟类的物种组成正在发生变化，这与生物多样性变化的全球趋势一致。
