Trujillo-Jiménez Patricia, Castro-Lara Miguel Angel
Centro de Investigaciones Biológicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México.
Rev Biol Trop. 2009 Mar-Jun;57(1-2):195-209.
Notropis moralesi, locally known as "carpa tepelneme", is a small endemic fish of the Papaloapan River. We analyzed its diet and feeding habits. Specimens were captured monthly from Amacuzac, River, Morelos, Mexico. The gut content of 294 specimens was identified to the most specific taxonomic category possible. We quantified gut content by the numerical and frequency of occurrence methods and used the Levin's amplitude of trophic niche indices and MacArthur and Levin's indices for niche overlaping. The N. moralesi diet was composed by eleven prey categories, ten of which were of animal item. Chironomids and mayfly were the most consumed prey, independently of season and fish sex or size. We found ten nutritional components in the dry season, and eight in the rainy season. The estimated amplitude of trophic niche (Levin's method) revealed high values in both seasons. The diet had ten nutritional components in immatures, eight in females and five in males. A Chi-squared test showed not significant differences in the diet by development stage, sex, and season. The niche overlaping index was high (above 0.60) for all analyses. N. moralesi is a carnivorous species with entomophagus tendencies.
莫拉莱斯氏细脂鲤，当地称为“carpa tepelneme”，是帕帕洛阿潘河的一种小型特有鱼类。我们分析了它的食性和摄食习惯。样本每月从墨西哥莫雷洛斯州阿马库萨克河采集。对294个样本的肠道内容物进行了尽可能详细的分类鉴定。我们通过数量和出现频率方法对肠道内容物进行量化，并使用莱文氏营养生态位宽度指数以及麦克阿瑟和莱文氏生态位重叠指数。莫拉莱斯氏细脂鲤的食物由11个猎物类别组成，其中10个是动物类。摇蚊和蜉蝣是最常被食用的猎物，与季节、鱼的性别或大小无关。我们在旱季发现了10种营养成分，雨季发现了8种。通过莱文氏方法估计的营养生态位宽度在两个季节都显示出较高的值。幼鱼的食物中有10种营养成分，雌鱼有8种，雄鱼有5种。卡方检验表明，在发育阶段、性别和季节方面，食物组成没有显著差异。所有分析的生态位重叠指数都很高（高于0.60）。莫拉莱斯氏细脂鲤是一种具有食虫倾向的肉食性物种。
