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| Garla,Ricardo C.; Gadig,Otto B. F.; Garcia Junior,José; Veras,Leonardo B.; Garrone-Neto,Domingos. |
| ABSTRACT The hunting tactics of lemon sharks, Negaprion brevirostris, are described from underwater and cliff-top observations in the Fernando de Noronha Archipelago, western equatorial Atlantic, Brazil. Two main tactics were observed in the shallow waters of sandy beaches and reefs environments: (i) “substrate inspection” of crevices and holes over rocky and reef bottoms, and (ii) “sardine blitz”, which refer to striking schools of fishes (mainly sardines) in the surf zone. The first tactic was restricted to juveniles up to 2 m of total length, whereas subadult and adult sharks with total length larger than 2 m displayed the second. As lemon sharks use waters less than 5 m depth to hunt, perform social behaviours and predator avoidance, results highlight... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carcharhinidae; Elasmobranch; Foraging Behaviour; Predation; Predator-prey Interactions. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000100206 |
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| Carvalho,Marcelo R. de; Gomes,Ulisses L.; Gadig,Otto B. F.. |
| The first report of a western South Atlantic soft skate, genus Malacoraja Stehmann, 1970, is described as Malacoraja obscura, new species, from the southeastern Brazilian continental slope off the states of Espírito Santo and Rio de Janeiro, in depths ranging from 808-1105 m. The new species is known from five specimens and is distinguished from congeners by its unique dorsal coloration with small, faded white spots on disc and pelvic fins, by retaining in larger specimens an irregular row of thorns along dorsal midline of tail (extending from tail base to two-thirds of tail length in 680 mm total length female), and by presenting a ventral tail midline devoid of small denticles only at base (naked region not extending posterior to pelvic fin rear margin).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rajinae; Gurgesiellini; Anatomy; Taxonomy; Systematics; Phylogenetic relationships. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200002 |
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