Distributional Changes of Landbird Species in Agroecosystems of Central Argentina

The condor

Mariano Codesido¹ 

关键词: agricultural intensification;    agroecosystem;    grassland birds;    Pampas;    Argentina;   

DOI  :  10.1525/cond.2011.090190

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. We present the first quantitative comparative study between current (2006–2008) distributions of landbird and those recorded prior to the massive planting of transgenic soy beans in the Pampas of central Argentina (Narosky and Di Giacomo 1993). We surveyed landbirds along transects covering 23 counties of Buenos Aires province. To allow a comparison between our observations and those of Narosky and Di Giacomo, we used the number of counties in which each species was recorded as an estimate of current and past distributions. We found grassland and wetland specialists in significantly fewer counties than did Narosky and Di Giacomo (P < 0.05), while habitat generalists and woodland specialists showed no significant change. The earlier study, however, covered a longer period of time, which could explain the reduction of wetland dwellers as a result of variation in the supply of temporary water bodies. The decreased area of occupancy of grassland specialists, on the other hand, may reflect the reduct...

【 授权许可】

CC BY