Projeto Dacnis

Ubatuba, Brazil

Projeto Dacnis

Ubatuba, Brazil
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Muscat E.,Projeto Dacnis | Saviolli J.Y.,Projeto Albatroz | Costa A.,Estacao Ecologica Tupinambas | Chagas C.A.,Projeto Dacnis | And 3 more authors.
Check List | Year: 2014

Alcatrazes island and surrounding islets, 35 km from the mainland in southeastern Brazil, are a young archipelago created by rising sea levels around 7,000 years BP. The main island covers 135 ha and is the only to harbour forest, the four islets showing exposed rock, grasses and sedges. A total of 82 species, of which six breeding seabirds, has been recorded in the archipelago. Another 11 seabirds were documented in the waters surrounding the islands. Alcatrazes holds the largest Magnificent Frigatebird, Fregata magnificens, colony in the southern Atlantic, as well as the threatened Brazilian population of Royal Terns, Thalasseus maximus. The landbird community is impoverished, with few resident species but a large number of seasonal visitors, including Atlantic forest species and intertropical and southern migrants. © 2014 Check List and Authors.


On 06 October 2012 a pod of Rough-toothed Dolphins Steno bredanensis (Delphinidae) was observed catching and tearing apart several Castin Leatherjacks Oligoplites saliens (Carangidae) near Montão de Trigo Island, northern coast of São Paulo, Brazil. The resulting floating masses of viscera attracted a feeding aggregation of 120-150 Wilson's Storm-petrels Oceanites oceanicus (Hydrobatidae), a transequatorial migrant passing through the area during October. This interspecific association has not been recorded before, although it could be expected given that S. bredanensis feeds on large fish and O. oceanicus is a known scavenger of kills made by cetaceans such as Killer Whales.

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