BUSCADOR RECOLECTA

File_SIA_Condor Isotopic values of historical and modern Andean condors and their main trophic resources collected in the Patagonian area, Over the last century, marine mammals have been dramatically reduced in the world’s oceans. We examined evidence that this change caused dietary and foraging pattern shifts of the Andean condor (Vultur gryphus) in Patagonia. We hypothesized that, after the decrease in marine mammals and the increase in human use of coastlines, condor diet changed to a more terrestrial diet which, in turn, influenced their foraging patterns. We evaluated the diet by means of stable isotope analysis (δ13C, δ15N and δ34S) of current (last decade) and historical (1841-1933) feathers. We further evaluated the movement patterns of 23 condors using satellite tracking of individuals. Condors reduced their use of marine-derived prey in recent compared to historical times from 33±13% to less than 8±3% respectively, however, they still breed close to the coast. The average distance between the coast and nests was 62.5 km. Some nests were located close to the sea, but some birds forage up to 86k m from nesting sites and must cross over the mountain range to find food. The worldwide reduction in marine mammal carcasses, especially whales, may have major consequences on the foraging ecology of scavengers as well as on the flux of marine inputs within terrestrial ecosystems., Peer reviewed

The data are organized into two Excel files: 1. dead vs alive GPS-tags.xls. This file includes data on radio-tagged individuals that were classified as surely dead or surely alive, together with the GPS-satellite tags-parameters used to predict their dead or alive status. 2. dead vs alive Doppler-tags.xls. This file includes data on radio-tagged individuals that were classified as surely dead or surely alive, together with the Doppler tags-parameters used to predict their dead or alive status., Peer reviewed