Román-Valencia C
Universidad del Quindio, Departamento de Biología, A.A. 460, Armenia, Quindio, Colombia.
Rev Biol Trop. 2001 Jun;49(2):657-66.
The trophic and reproductive ecology of catfish (Trichomycterus caliense and Astroblepus cyclopus) was studied in the Quindio River upper Basin, Alto Cauca, Colombia. The pH was neutral, water oxygen content high (8.4 ppm) and temperature in the habitats was 18.63 degrees C; both species are nonmigratory and sympatric with four other fish species. The ovaries mature primarily between May and September in T. caliense; between December and May in A. cyclopus. The mean size at maturity is 8.3 cm (standard length) in T. caliense and 6.0 cm (standard length) in A. cyclopus; the sex ratio is 1:1 in T. caliense (X2 = 3.4, P > or = 0.05) and in A. cyclopus (X2 = 1.44, P > or = 0.1); the fecundity is low (191 and 113 oocytes respectively) and the eggs are small (1.5 and 2.39 mm respectively). The fishes are insectivorous and specialize in Coleoptera, Diptera and Trichoptera; Spearman Rank Correlation Coefficients (rs = 0.464) indicated that there are differences (T = 2.5148, P < 0.01) between their diets; both taxa did not agree with the expected trophic habits for sympatric species that are morphologically similar and related in the same trophic level.
在哥伦比亚考卡上游流域昆迪奥河，对鲶鱼（Caliense三毛鲶和Cyclopus星项鲶）的营养和繁殖生态进行了研究。pH值呈中性，水中氧气含量高（8.4 ppm），栖息地温度为18.63摄氏度；这两个物种均不洄游，且与其他四种鱼类同域分布。Caliense三毛鲶的卵巢主要在5月至9月成熟；Cyclopus星项鲶的卵巢则在12月至5月成熟。Caliense三毛鲶成熟时的平均体长为8.3厘米（标准长度），Cyclopus星项鲶为6.0厘米（标准长度）；Caliense三毛鲶的雌雄比例为1:1（卡方 = 3.4，P≥0.05），Cyclopus星项鲶也是1:1（卡方 = 1.44，P≥0.1）；繁殖力较低（分别为191和113个卵母细胞），且卵较小（分别为1.5毫米和2.39毫米）。这些鱼类以昆虫为食，主要捕食鞘翅目、双翅目和毛翅目昆虫；斯皮尔曼等级相关系数（rs = 0.464）表明它们的食性存在差异（T = 2.5148，P < 0.01）；这两个分类单元均不符合形态相似且处于同一营养级的同域物种预期的营养习性。
