Recent decline and potential distribution in the last remnant area of the microendemic Mexican axolotl (Ambystoma mexicanum)
Recent decline and potential distribution in the last remnant area of the microendemic Mexican axolotl (Ambystoma mexicanum)
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DOI：
10.1016/j.biocon.2009.07.008
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发表时间：
2009-12-01
影响因子：
5.9
通讯作者：
Zambrano, Luis
中科院分区：
文献类型：
--
作者：
Contreras, Victoria;Martinez-Meyer, Enrique;Zambrano, Luis
墨西哥蝾螈（Ambystoma mexicanum）是墨西哥中部的一种微地方性蝾螈，在过去的几十年里，由于城市发展造成的栖息地丧失，其本地种群数量出现了惊人的下降。其分布的最后残余是在墨西哥城南部边缘的霍奇米尔科地区的高度异质的城乡水系统中。我们开发了一个模型的物种本地分布的生态位的基础上，使用发生数据和特设湖沼变量通过遗传算法规则集生产（GARP），以确定合适的地区的物种和优先保护工作。结果表明，Xochimilco的蝾螈的潜在分布仅限于11个网站在6个减少，隔离和分散的地区，主要位于传统农业（chinampas）是主要的土地利用的区域。最近的调查发现，只有一个单一的有机体在整个研究区域，在预测的网站之一，这表明在野外的美西螈的长期生存的关键情况，并要求对栖息地和人口恢复的紧急行动。这项研究也说明了实用的生态位建模方法的水生系统在一个精细的尺度。(C)2009爱思唯尔有限公司保留所有权利。
Native populations of the axolotl (Ambystoma mexicanum), a microendemic salamander from Central Mexico, have seen alarming decline in the last decades owing to habitat loss caused by urban growth. The last remnant of its distribution is in a highly heterogeneous urban-rural water system in the Xochimilco region, at the southern edge of Mexico City. We developed a model of the species local distribution based on its ecological niche, using occurrence data and ad hoc limnetic variables via the Genetic Algorithm for Rule-set Production (GARP), to identify suitable areas for the species and prioritize conservation efforts. Results indicated that potential distribution of the axolotl in Xochimilco is limited to 11 sites in six reduced, isolated, and scattered areas, located mostly in zones where traditional agriculture (chinampas) is the primary land use. Recent surveys found only a single organism in the whole study region, in one of the predicted sites, suggesting a critical situation for the long-term survival of the axolotl in the wild, and demanding urgent actions toward habitat and population restoration. This study also illustrates the utility of niche modeling approaches for aquatic systems at a fine scale. (C) 2009 Elsevier Ltd. All rights reserved.