Trophic ecology of Saccodon dariensis (Pisces: Parodontidae) in Guatapé River tributaries, Magdalena River Basin, Colombia
Journal Title: Revista MVZ Cordoba - Year 2014, Vol 19, Issue 1
Abstract
Objective. To study the trophic ecology of Saccodon dariensis in the Peñoles and El Cardal streams, Guatape River mid-basin, Magdalena River Basin, Colombia. Materials and methods. To compare differences in size between individuals from the two streams in terms of hydrologic periods, oral polymorphisms or sexes, an analysis of variance was conducted (ANOVA). Volume percentages, frequency of occurrence and the food importance index (FII) were determined; a principal component analysis (PCA) and an ANOVA was carried out to determine the diet differences between streams, climatic periods, oral polymorphism, sexes and developmental states, as well as a Mann-Whitney pairwise comparison test for each food category. Results. A significant difference was found in size between individuals of the two streams with different oral polymorphism. Algae are the most important food item (FII: 91.9%), followed by Trichoptera and insect remains (FII: 4.3%), and vegetal material (FII: 1.8%). The PCA did not indicate significant differences in diet between streams, climatic periods, oral polymorphisms, sexes or developmental states, but the ANOVA and Mann-Whitney pairwise comparison test indicated differences in oral morphotype, where individuals with a straight mouth consumed more vegetal material. We also observed different proportions in consumption of different algae genera, and increased consumption of insects in ontogeny, this being higher in individuals with a straight mouth. Conclusions. The species is algaevorous. The oral morphotypes of S. dariensis may be related to a trophic polymorphism that confers different trophic habits and differential access to the items that constitute their diet.
Authors and Affiliations
Ana Restrepo-Gómez, Zoot| Universidad Nacional de Colombia, Departamento de Ciencias Forestales. Posgrado en Bosques y Conservación Ambiental. Medellín, Colombia., Néstor Mancera-Rodríguez, Ph. D *| Universidad Nacional de Colombia, Departamento de Ciencias Forestales. Posgrado en Bosques y Conservación Ambiental. Medellín, Colombia.Correspondencia: njmancer@gmail.com
Keywords
Related Articles
- EP ID EP3342
- DOI -
- Views 366
- Downloads 20
Phenotypic characterization of canine Malassezia spp., isolates
Objective. To characterize and identify yeasts of the genus Malassezia by phenotypic features. Materials and methods. First, the macroscopic and microscopic morphological characteristics were described. In addition we pe...
Effect of cholesterol and dimethiyl-formamide on post-thawing parameters in Colombian creole stallion sperm
Objective. To evaluate the effect of cholesterol and dimethyl formamide on the cryosurvival of colombian creole stallion sperm. Materials and methods. Semen from ten stallions was collected and frozen using the same prot...
Lipofundin 20% induces hepatic lipid peroxidation in New Zealand white rabbits
Objective. The aim of the present work was to evaluate the effects of Lipofundin 20% on lipid peroxidation markers in the liver of New Zealand white rabbits. Materials and methods. The animals were treated with an intrav...
TESTICULAR NEOPLASMS IN DOGS: A CASE OF SERTOLI CELL TUMOR
Testicular neoplasms are not common in domestic animals. Among domestic animals, canines manifest them with more frequency (0.7% to 4.6% of all canine tumors). Some predisposing factors including age and the presence of...
Productive performance of hair lambs, fed with fresh lemon pulp as an energy source
Objective. Evaluate the effect of the inclusion of different levels of fresh lemon pulp (FLP) was determined as a substitute of sorghum grain in the feeding of hair sheep in parameters of daily weight gain (DWG), daily f...