Browsing by Author "Branco, Joaquim Olinto"
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- Hábitos alimentares de Paralonchurus brasiliensis (Steindachner, 1875) em Penha, SC, Sul do BrasilPublication . Goetten, Maurício Antônio; Bosse, Afonso; Sedrez, Mário C.; Barrilli, Germano H. C.; Verani, José R.; Martins, Mariana de Oliveira; Branco, Joaquim Olinto; Barreiros, João P.Paralonchurus brasiliensis é um Sciaenidae comum no bycatch da pesca de arrasto do camarão sete-barbas (X. kroyeri) no sul do Brasil. A despeito de sua importância ecológica, estudos sobre os hábitos alimentares dessa espécie são ainda incipientes (COSTA et al., 2012). Assim, esse trabalho tem como objetivo analisar os hábitos alimentares de P. brasiliensis, a fim de se avaliar o impacto da pesca de arrasto sobre as cadeias alimentares marinhas costeiras do sul do Brasil.
- Reproductive dynamics of Sterna hirundinacea Lesson, 1831 in Ilha dos Cardos, Santa Catarina, BrazilPublication . Fracasso, Hélio Augusto A.; Branco, Joaquim Olinto; Efe, Márcio Amorim; Barreiros, João P.In this work, we intend to describe the reproductive dynamics of Sterna hirundinacea in an island fromSouth Brazil.We studied the reproductive biology of this species in its natural environment and provide data on their growth, survival, and reproductive success in Ilha dosCardos, SantaCatarina, South Brazil. Samplingswere carried out daily on the island throughout the reproductive seasons of 2003, 2005, and 2006 and the different stages of development of the chicks were characterized according to age, length of the beak, and plumage characteristics.We provide a basic equation Lm = 167.91 (1 – e −0.062t−(−0.23)) to determine the approximate age of individuals using their body mass. The main cause of chick mortality on the island was natural (63.17% in 2003, 81.41% in 2005, and 79.96% in 2006), whereas predation contributed to mortality in a proportion of 38.83% in 2003, 18.59% in 2005, and 20.04% in 2006.The absence in the area of the chicks’ main predator, Kelp gull (Larus dominicanus), the large number of chicks that reached the final stages of development, and their reproductive success demonstrate that Ilha dos Cardos is an important breeding site for the species in southern Brazil.
- A trophic analysis of target species of macrobenthos in a subtropical coast community: a taxa relationship essayPublication . Araújo, Maria Elisabeth; Lunardon-Branco, Maria José; Verani, José R.; Branco, Joaquim Olinto; Barreiros, João P.; Christoffersen, Martin LindseyStudies on the feeding habits of aquatic organisms are a requirement for the management and sustainable use of marine ecosystems. The aim of the present research was to analyze the habits and trophic similarities of decapods, starfish and fish in order to propose trophic relationships between taxa, using Hennigian methods of phylogenetic systematics. This new grouping hypothesis, based on shared and exclusive food items and food types, corresponds to the broad taxonomic groups used in the analysis. Our results indicate that algae, Mollusca, Polychaeta, Crustacea, Echinodermata and Actinopterygii are the most exploited common resources among the species studied. Starfish were differentiated from other organisms for being stenophagic, and were grouped for feeding on bivalve mollusks. A larger group of fish and crustaceans shares algae and mainly crustaceans as food items. A third group united all eight species of Actinopterygii. This largest subgroup of fish is typically carnivorous, feeding on Anthozoa and a great quantity of Crustacea. Synodus foetens has a special position among fishes, due to its unique feeding on nematodes. A Euclidean distance dendrogram obtained in a previous publication grouped S. foetens with starfish. That result was based on a few non-exclusive shared similarities in feeding modes, as well as on shared absences of items, which are not an adequate grouping factor. Starfish are stenophagic, eating bivalves almost exclusively. Synodus foetens and Isopisthus parvipinnis have restricted food items, and are thus intermediary in relation to starfish, decapods, and other fish, which are euryphagous. The trophic cladogram displays details of food items, whether or not shared by all species. The resulting trophic analysis is consistent with known historical relationships.
- The Yellow-crowned Night Heron Nyctanassa violacea (Aves: Pelecaniformes: Ardeidae) in the Azores and Madeira Archipelagos: a new species for the Western PalearcticPublication . Barreiros, João P.; Elias, Rui B.; Gabriel, Rosalina; Rodrigues, Pedro; Barcelos, Luís Miguel Duarte; Branco, Joaquim Olinto; Borges, Paulo A. V.This paper presents and describes the first confirmed occurrence of the Yellow-crowned Night Heron Nyctanassa violacea in the Azores, which also represents the first record for Europe and the Western Palearctic. We also present and discuss subsequent reports of the species in Macaronesia. Several hypotheses may help to explain the occurrence of this species in this part of the Atlantic, including disorientation caused by strong winds and increasing observation pressure. However, further studies are necessary to assess the part played by the different factors in the occurrence of new vagrant individuals/species in Macaronesia.