Plasencia Vázquez Alexis Herminio, Escalona Segura Griselda
Rev Biol Trop. 2014 Dec;62(4):1509-22.
Psittacidae family is one of the most endangered groups in Mexico, since many of their habitats are disappearing. In this research, we characterized the land cover of the potential geographical distribu- tion area of eight extant parrot species within the Yucatan Peninsula. We used the Maximum Entropy algorithm (MaxEnt) and species historical records. To externally validate the models, we used presence and absence records from field observations (2010-2012). To characterize the distribution area, we used the vegetation and land use maps of INEGI Series IV (2007-2010). The models showed a good performance, according to the values of the area under the curve (AUC), which ranged between 0.88-0.95 with the training data and between 0.82-0.91 with test data. We located most of the species in sites where the models predicted their presence. In the Peninsula, over 76% of the parrots' potential geographical distribution area is forested, except for Amazona oratrix. The subhumid tropical forest is the best represented, and the livestock for land use. The most affected species within the Peninsula are: Amazona farinosa and A. oratrix. The Calakmul Biosphere Reserve is the most important area for parrots' protection in the Peninsula. Knowing the characteristics of distribution areas is an essential part in the establishment of parrots' conservation strategies.
鹦鹉科是墨西哥最濒危的群体之一，因为它们的许多栖息地正在消失。在这项研究中，我们对尤卡坦半岛现存的八种鹦鹉潜在地理分布区域的土地覆盖情况进行了特征描述。我们使用了最大熵算法（MaxEnt）和物种历史记录。为了对模型进行外部验证，我们使用了实地观察（2010 - 2012年）的存在和不存在记录。为了描述分布区域，我们使用了国家统计和地理研究所第四系列（2007 - 2010年）的植被和土地利用地图。根据曲线下面积（AUC）值，模型表现良好，训练数据的AUC值在0.88 - 0.95之间，测试数据的AUC值在0.82 - 0.91之间。我们在模型预测有鹦鹉存在的地点找到了大多数物种。在半岛上，除了红额亚马逊鹦鹉外，超过76%的鹦鹉潜在地理分布区域为森林。亚湿润热带森林占比最大，土地利用类型为畜牧业。半岛内受影响最大的物种是：鳞头亚马逊鹦鹉和红额亚马逊鹦鹉。卡拉科姆尔生物圈保护区是半岛上鹦鹉保护最重要的区域。了解分布区域的特征是制定鹦鹉保护策略的重要组成部分。
