LAUSR

The present study compares the trophic ecology of two guitarfishes (Pseudobatos percellens and P. horkelii) from the continental shelf of the São Paulo State, Brazil, caught by the bottom pair trawls between 2007 and 2009. These two sympatric species are under different threat categories, "Vulnerable" and "Critically Endangered", respectively, according to Brazilian Agencies. Thus, any study considering trophic ecology parameters are pivotal in understanding the trophic ecology role of such species in the ecosystem. In total, were analyzed 500 stomachs of P. percellens and 108 of P. horkelii, quantifying with dietary indexes: Numerical (%N), Gravimetric (%W), Frequency of Occurrence (%FO), and the Prey-specific Index of Relative Importance (%PSIRI). For P. percellens and P. horkelii, 26 and 14 different prey items were found, respectively. Crustacea and Teleostei were the most important prey items for both species, indicating a specialist feeding behavior due to their low niche amplitude. The results provide evidence related to ontogenetic dietary shift in P. percellens and individual-level diet specialization in both species. These two benthic-demersal elasmobranchs are important mesopredators (3,7 for P. percellens, and 3,5 for P. horkelii) in the study area, with high trophic level values. This article is protected by copyright. All rights reserved.