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Ecological specialization; floaters; individual ecology; intraspecific variation; nicheROVER; pulsed resources; SIBER; SIDER; trophic ecology; ISOTOPE MIXING MODELS; CARACARAS PHALCOBOENUS-AUSTRALIS; OPTIMAL FORAGING THEORY; STABLE-ISOTOPES; DISCRIMINATION FACTORS; STRIATED CARACARAS; INTRASPECIFIC COMPETITION; INTRAPOPULATION VARIATION; FALKLAND ISLANDS; STATEN-ISLAND
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Full-Text Articles in Life Sciences
The Dynamic Trophic Niche Of An Island Bird Of Prey, Ulises Balza, Nicolas A. Lois, Michael J. Polito, Klemens Puetz, Amira Saalom, Andrea Raya Rey
The Dynamic Trophic Niche Of An Island Bird Of Prey, Ulises Balza, Nicolas A. Lois, Michael J. Polito, Klemens Puetz, Amira Saalom, Andrea Raya Rey
Faculty Publications
Optimal foraging theory predicts an inverse relationship between the availability of preferred prey and niche width in animals. Moreover, when individuals within a population have identical prey preferences and preferred prey is scarce, a nested pattern of trophic niche is expected if opportunistic and selective individuals can be identified. Here, we examined intraspecific variation in the trophic niche of a resident population of striated caracara (Phalcoboenus australis) on Isla de los Estados (Staten Island), Argentina, using pellet and stable isotope analyses. While this raptor specializes on seabird prey, we assessed this population's potential to forage on terrestrial prey, especially invasive …