Browsing by Author "Brito, Alberto"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- On the phylogenetic affinities of Centrolabrus trutta and Centrolabrus caeruleus (Perciformes: Labridae) to the genus Symphodus : molecular, meristic and behavioural evidences.Publication . Almada, Vitor; Almada, Frederico; Henriques, Miguel; Santos, Ricardo S.; Brito, AlbertoPhylogenetic analysis of partial 12S and 16S mitochondrial rDNA regions, together with meristic and ethological data, has revealed that Centrolabrus trutta (Lowe, 1833), a species occurring in the Canaries and Madeira, and its close relative Centrolabrus caeruleus (Azevedo, 1999) from the Azores, are more closely related to most species of the genus Symphodus than to Centrolabrus exoletus (Linnaeus, 1758). Underwater behavioural observations showed that C. trutta, like C. caeruleus, shares with most Symphodus species sexual dichromatism, male nest building and male parental care of the eggs, traits that are absent in C. exoletus. The low number of base substitutions found between C. trutta and C. caeruleus indicates that these species are very closely related. The 16S rDNA data suggest that C. trutta, C. caeruleus and S. roissali form a monophyletic group. The analysis of the 16S rDNA data also showed that S. melanocercus is the sister species of C. exoletus and it is not closely related to the species of Symphodus included in this study. Lack of nest building and parental behaviour in S. melanocercus, and its marked divergence to other members of the genus Symphodus in meristic characters, also stress its affinity with C. exoletus and its separation from the remaining species of Symphodus. Our data and the evidence available in the literature led us to propose the inclusion of C. trutta and C. caeruleus in the genus Symphodus, while S. melanocercus must be transferred to the genus Centrolabrus.
- The polygon moray, Gymnothorax polygonius (Poey, 1875) : A new record from Ascension Island, South AtlanticPublication . Richardson, Andrew J.; Brito, AlbertoAscension Island (07°57′S, 14°22′W) is an isolat-ed volcanic edifice in the South Atlantic. The closest land, St. Helena is approximately 700 miles south with the closest land mass of any size being West Africa, 1000 miles to the east. Approximately 1500 miles west of Ascension Island is the coast of Brazil. As such, the fish community of the island is a mixture of eastern and western Atlantic species, although richness is relatively low compared with other similar loca-tions such as Cape Verde (Wirtz et al. 2014). Despite the apparent remoteness of Ascension Island there have been several key publications on the ichthyofauna for the island and surround-ing marine zone. The fish community of Ascen-sion was first summarized by Cadenat & Marchal (1963), with a comprehensive checklist of shal-low-water fish species published by Lubbock (1980) record-ing 71 species. A report on the benthic and near-benthic fish community, from seamounts around Ascension, was compiled in Trunov (2006). The most recent review of the ichthyofauna of Ascen-sion can be found in Wirtz et al. (2014), a study listing 173 fish species, including 12 members of the family Muraenidae. The extensive rocky ma-rine habitat of Ascension Island is often consid-ered a key factor behind the considerable abun-dance of moray eels around the island. On 21 Feburary 2015 an unidentified moray eel was caught by a recreational angler who had been fishing in deep water from a vessel off the west-ern coast of Ascension Island (Fig. 1). The spec-imen did not match any previous identification records of Muraenidae from Ascension Island. […].