Variação espaço temporal na dieta de quatro espécies da subfamília Cheirodontidae (Characiformes, Characidae) em um rio intermitente do semiárido brasileiro

• Autor(a) principal: Santos, Thabata Cavalcante dos
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• dARK ID: ark:/83112/001300000gpp8
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/69073
• topic: Ecologia trófica; Characidae; Rios intermitentes; Semiário

The intermittent rivers have two distinct seasons, the full season which has continuous water flow and the dry season and which ceases in the dry season. In these environments occur the formation of temporary pools that many aquatic species use as a refuge. The objective of this study was to characterize trophic ecology, verify the amplitude and niche overlap by analyzing and interspecific interactions of four species of Characidae: Serrapinnus heterodon, Serrapinnus piaba, Compsura heterura and Phenacogaster calverti. A total of 570 individuals were collected between the years of 2012 and 2015 on the Cruxati river. The analysis of the stomach contents was done through the methods of Frequency of Occurrence (Fi%), and Volumetric (Vi%). The values obtained were used to calculate the Index of Food Importance (IAi). The niche amplitude of each species was determined by the Levins Index and the niche overlap by the Pianka Index. The analysis of the population food strategy was measured by the Amundsen Graphical Analysis Method modified by Costello (1991). The interspecific variation was analyzed by a Varied Permutation Analysis (PERMANOVA) in conjunction with the Dissimilarity Percentage Analysis (SIMPER), also the Similarity Analysis (ANOSIM) to graphically illustrate the present differences. Total of 398 individuals were analyzed from the four species. The description of the diet for each species for the two seasons (full and dry) was described. The dietary strategy of the species differed between seasons and within the dry season in the puddles. The niche amplitude was higher in Pool 1, the highest values for S. heterodon, S. piaba and P. calverti were in the full season. The niche overlap of the diet of the four species was higher in the full season with values of 0.99 and in the dry season in Pool 1 and 3, with 0.99 and 1 respectively. The diet of the species showed interspecific differences and between seasons. The species presented several feeding strategies as generalists and specialists, among the seasons, wide niche width and niche overlap presented in the dry season.