Sazonal variation of sea birds in Arrozal sandbank, city of Cananeia-SP

DOI: 10.15343/0104-7809.20113517183

Abstract

The aim of this work was to identity the abundance of coastal and estuary birds species that occupy Arrozal sandbank in
Cananeia (SP), and its seasonal/monthly variation during the years of 2005 and 2006. The censuses had been made during tide low,
through direct counting, where the observer in a fixed point developed individual counting of species. It was found in the place a total
of 30 species congregated in 13 families and 6 orders, in a total of 37 samples during the period 2005-2006. Phalacrocorax brasilianus,
Rynchops niger, Thalasseus acuflavidus e Thalasseus maximus were the most abundant birds. The four species together accounted
for 86.8% of birds observed during the period of study. The distribution of Phalacrocorax brasilianus and Rynchops niger individuals
during the seasons had not been equal. Thalasseus maximus did not present difference in the distribution of individuals throughout the
seasons, but when we applied Tukey test it was possible to verify a significant difference between winter and spring. As for Thalasseus
acuflavidus, the distribution of species throughout the seasons was equal throughout the year.