Browsing by Author "Sazima, Ivan"
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- Evolutionary history, biogeography, and a new species of Sphoeroides (Tetraodontiformes: Tetraodontidae): how the major biogeographic barriers of the Atlantic Ocean shaped the evolution of a pufferfish genusPublication . Araujo, Gabriel S; Kurtz, Yan R.; Sazima, Ivan; Carvalho, Pedro Hollanda; Floeter, Sergio; Vilasboa, A; Vasconcellos, A.V.; Rotundo, Matheus; Ferreira, Carlos; Barreiros, João P.; Pitassy, Diane E; Carvalho-Filho, AlfredoABSTRACT: Tetraodontidae is the most speciose family of Tetraodontiformes and is represented by fish popularly known as pufferfishes. They are characterized by modified jaws with four dental plates and the ability to inflate their bodies. Tetraodontids are distributed throughout the world and have a wide range of habitat use. One of its genera, Sphoeroides, shows a biogeographical pattern, with 19 of its 21 species restricted to coastal regions of the Americas. Although represented in large-scale phylogenies, the evolutionary history and biogeography of the genus have not been explored in detail. The present study aims to understand the historical and biogeographic processes that shaped the evolutionary history of Sphoeroides. Including samples from all biogeographic regions of its occurrence, we reconstruct a phylogenetic/biogeographic history hypothesis for the genus. Our results show that Sphoeroides is a paraphyletic group comprising Colomesus; indicate a central role of the biogeographic barriers of the Atlantic Ocean in the diversification of the genus; and identified a cryptic species in Brazilian waters, formally known as S. spengleri, described here through integrative taxonomy. We also propose nomenclatural changes given the position of Colomesus deeply nested within Sphoeroides.
- First record of Polyprion oxygeneios (Perciformes: Polyprionidae) for the southwest Atlantic Ocean and a northernmost range extension.Publication . Barreiros, João P.; Machado, Leonardo F.; Hostim-Silva, Maurício; Sazima, Ivan; Heemstra, Phillip C.The hapuka Polyprion oxygeneios (Schneider & Foster) (Fig. 1) is an important deep-water commercial fish species, caught mainly off Australia, New Zealand, Juan Fernandez Archipelago off Chile, the Tristan da Cunha Group of the South Atlantic (Sepúlveda & Pequeño, 1986; May & Maxwell, 1986; Paulin et al., 1989; Paxton et al., 1989; Andrew et al., 1995) and incidentally caught off Chilean Patagonia (Nakamura et al., 1986). The distribution of P. oxygeneios is exclusively southern circum-global, intemperate-cold waters from 28_ to 43_ S (Paxton et al., 1989). Polyprion oxygeneios (Polyprionidae; Nelson, 1994) is mainly a demersal species with a depth range of 50–450 m, occurring over ‘rough’ ground from the central shelf to the upper slope (Paxton et al., 1989). It reaches 150 cm total length (LT) and may weigh up to 100 kg, its juveniles being found near the surface, probably associated with drifting material in a way similar to that recorded for Polyprion americanus (Bloch & Schneider) (Paxton et al., 1989; Saldanha, 1995). This paper reports the first record of P. oxygeneios from the south-west Atlantic.
- Plataformas de petróleo – Pontos de encontro de peixes em alto-marPublication . Hostim-Silva, Maurício; Fontes, Jorge; Afonso, Pedro; Serpa, Norberto; Sazima, Cristina; Barreiros, João P.; Sazima, IvanAlém da sua importância econômica, as plataformas marítimas de prospecção e extração de petróleo desempenham uma função ecológica pouco conhecida do público: em alto-mar, suas estruturas submersas, que chegam a dezenas de metros de profundidade, servem como locais de abrigo, alimentação e reprodução de peixes. Também constituem um hábitat para organismos que vivem fixos ou junto a algum substrato, como corais, algas, moluscos e crustáceos, fontes de alimentação para diversas espécies de peixes. […].