Patterns and Magnitude of Temporal Change in Avian Communities in the Ecuadorian Andes

The condor

Steven C. Latta¹ 

关键词: avian abundance;    climate change;    habitat change;    land use;    monitoring;    páramo;    protected areas;   

DOI  :  10.1525/cond.2011.090252

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. The tropical Andes rank first among the world's 25 “hotspots” of biodiversity and endemism yet are threatened and little studied. We contrast population trends in avian diversity in montane cloud forest (bosque altoandino) and similar forest degraded by the planting of introduced tree species (bosque introducido) in the Mazán Reserve, Ecuador. We describe changes in bird diversity and abundance in these habitats over 12 years and evaluate the nature of change within these avian communities. On the basis of 2976 count detections and 419 net captures of 76 species of landbirds, indices of similarity between the habitats were low, with only 47.6% of species occurring in both forest types. From 1994–95 to 2006–07, species richness decreased from 54 to 31 in bosque introducido and from 67 to 30 in bosque altoandino. Capture rates also declined from 56.0 to 28.5 birds per 100 mist-net hr in bosque introducido and from 38.0 to 22.4 birds per 100 mist-net hr in bosque altoandino. We explore various pote...

【 授权许可】

CC BY