Trophic Relationships Between Thinocorus orbignyanus (Charadriiformes: Thinocoridae), Lepus Europeaus (Lagomorpha: Leporidae), and Equus ferus caballus (Perissodactyla: Equidae) in High Mountain Grasslands During the Summer Season

Depending on the importance of hydromorphic vegetation formations of high mountain areas were established relations between the attributes of these grasslands and botanical composition of the diet of grey-breasted seedsnipe (Thinocorus orbignyianus), brown hares (Lepus europaeus), and horses (Equus ferus caballus). Hares showed greater dietary diversity (J) than horses and grey-breasted seedsnipes, factor that was correlated in all three cases, negatively with vegetation diversity patch. Same response amplitude was found when analyzing food web. The dietary diversity for all species showed no relation to the dry matter productivity vegetable patches. While correlation the abundance of two species of Cyperaceae in the meadow with the presence of the same in the diet of herbivores, we found a negative relationship between the abundance of Carex sp and grey-breasted seedsnipe diet, and a positive relationship between the Eleocharis pseudoalbibracteata species abundance and frequency in the diet of hares and horses. About the group of species content of graminoids in the diet, it was determined an overlap of 30% dietary animal species assessed, depending on that, it could identify the existence of interspecific competition between herbivores, this would be conditioned by the response of individuals to the environment.