Acosta Rebeca, Mesones Rosa Vera, Núñez Alejandro
Facultad de Ciencias Naturales, Consejo de Investigación, Universidad Nacional de Salta, Avda., Bolivia 5150.
Rev Biol Trop. 2005 Sep-Dec;53(3-4):569-75.
The loss and transformation of habitat by anthropogenic activities is one of the main causes of biodiversity decrease. Amphibians are declining all over the world and one of the causes of this decline is thought to be habitat reduction. However, there are anuran populations in highly disturbed habitats, like cities. This study presents the ecological baseline needed to understand anuran communities in urban environments, for Salta City. Argentina (ca. 502,000 inhabitants). The sample was stratified by environments defined by infrastructure and geographic location. The species were identified by visual encounter techniques and by auditory transect during the 2002-2003 reproductive period. Three families, seven genera and twelve species were recorded and the species richness decreased from city border to center. Similarity index values among geographic areas was higher East-West (94.7) than South-West (33.3). Bufo arenarum was the only species recorded in all environments. Hyla andina and Odontophrynus americanus had a restricted distribution and are here considered vulnerable. The border effect can explain some distribution pattern in these populations. A map of the potential distribution of recorded species for Salta is provided.
人为活动导致的栖息地丧失和转变是生物多样性减少的主要原因之一。两栖动物在全球范围内数量都在下降，这种下降的原因之一被认为是栖息地减少。然而，在高度受干扰的栖息地，如城市中，也存在无尾目种群。本研究给出了了解阿根廷萨尔塔市（约50.2万居民）城市环境中无尾目群落所需的生态基线。样本按基础设施和地理位置所定义的环境进行分层。在2002 - 2003年繁殖期，通过目视相遇技术和听觉样带法对物种进行鉴定。记录到了3个科、7个属和12个物种，物种丰富度从城市边缘向市中心递减。地理区域间的相似性指数值在东西方向（94.7）高于西南方向（33.3）。阿根廷蟾蜍是在所有环境中都有记录的唯一物种。安第斯雨蛙和美洲齿蟾分布受限，在此被视为易危物种。边缘效应可以解释这些种群中的一些分布模式。提供了萨尔塔市记录物种潜在分布的地图。
