Trujillo-Jiménez Patricia, Beto Héctor Toledo
Universidad Autónoma del Estado de Morelos, Centro de Investigaciones Biológicas, Cuernavaca, Morelos, México.
Rev Biol Trop. 2007 Jun;55(2):603-15.
We analyzed the diet and feeding habits of the fishes Heterandria bimaculata and Poecilia sphenops. Specimens were captured monthly in "Los Carros" damp, Morelos, Mexico (18 degrees 37' N, 98 degrees 43' W). We quantified gut content by the numerical method and by the frequency of occurrence method; and used the MacArthur and Levin's indices for niche overlap. The diet of H. bimaculata was composed by 16 prey categories, mainly dipterans (Culicidae predominated), independently of sex, size and season. The index of niche overlap was high, from 0.74 to 0.99. The diet of P. sphenops consisted of 11 items, detritus being the most consumed, also independently of sex, size and season. The niche overlap index was high (0.99), indicating overlapping for all analyses. There was little diet overlap (0.26) between the two species.
我们分析了双斑异齿鳉（Heterandria bimaculata）和楔斑食蚊鱼（Poecilia sphenops）的饮食及摄食习性。每月在墨西哥莫雷洛斯州“洛斯卡罗斯”湿地（北纬18度37分，西经98度43分）捕获样本。我们通过数量法和出现频率法对肠道内容物进行量化；并使用麦克阿瑟（MacArthur）和莱文（Levin）指数来计算生态位重叠。双斑异齿鳉的食物由16类猎物组成，主要是双翅目昆虫（以蚊科为主），与性别、大小和季节无关。生态位重叠指数很高，在0.74至0.99之间。楔斑食蚊鱼的食物包括11种，其中碎屑是消耗最多的，同样与性别、大小和季节无关。生态位重叠指数很高（0.99），表明所有分析结果均显示有重叠。这两个物种之间的食物重叠很少（0.26）。
