Banca de QUALIFICAÇÃO: RODRIGO XAVIER SOARES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : RODRIGO XAVIER SOARES
DATA : 10/11/2016
HORA: 14:00
LOCAL: Laboratório de Aulas práticas de Genética
TÍTULO:
PALAVRAS-CHAVES:

Circumtropical species; Chromosome evolution, Aquaculture, Fishery

PÁGINAS: 81
GRANDE ÁREA: Ciências Biológicas
ÁREA: Genética
RESUMO:

The big pelagic fish represents one of the most lucrative subjects of the industrial fisheries in Brazil. The State of Rio Grande do Norte attracts special attention because its geographic position constituting nowadays the region in which the commercial oceanic fisheries tends to enlarge with new policies of governmental incentive. Different from other World’s producer regions that are researching the main exploited species, in Brazil the studies that objectify the population delimitation and to list data for the conservation of the species are scarce. Among the pelagic groups is common to observe a predominance of a minor diversity in relation to the abundance, this is a characteristic in two of the most important families of this oceanic region, Sphyraenidae (barracudas), Carangidae (jacks and pompanos) and Coryphaenidae (dolphinfish). Its representatives are valued and intensely exploited by the fisheries industry. Data about these species are surrounded of logistics difficulties for its size, capture way and habitat which occupies. The first cytogenetical informations for some species of this family were obtained only recently. Here is presented a cytogenetical study with 11 pelagic fish species from the Atlantic, of the families Sphyraenidae, Carangidae, Corypahenidae, Istiophoridae, Megalopidae and Polynemidae which revealed divergences in the karyotipical macrostructure contrasting with the pattern considered basal for the Teleosts, besides the existence of masculine heterogamety, through a system of multiple sexual chromosomes of the kind X₁X₁X₂X₂/X₁X₂Y. Using techniques such as AgNORs, MM/DAPI it was possible to identify single ribosomal sites and showed cytotaxonomic markers for all species except for species of Polynemidae. It was also applied more resolutive cytogenetic techniques based on multigenic sequences mapping through FISH (Fluorescence in situ Hybridization). The results from this study will allow to infer about the active karyoevolutive processes and evolutive aspects of the investigated species. Through the developed techniques it will be also possible to expand the knowledge about this important resource and subside future policies of the management of stocks, beyond serve as basis for technological development in the aquaculture aiming to improve the cultivable stocks.

MEMBROS DA BANCA:
Externo à Instituição - GIDEÃO WAGNER WERNECK FELIX DA COSTA - UFRN
Externo à Instituição - PAULO AUGUSTO DE LIMA FILHO - IFRN
Externo ao Programa - 2257836 - PAULO SERGIO MARINHO LUCIO