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Systematic studies on the Chubbyhead Barbs species complex (Osteichthyes, Cyprinidae) from Southern Africa

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Resumo:The main objective of this dissertation was to reanalyze the systematics of the Chubbyhead Barbs Species Complex (CBSC) and to assess the phylogenetic relationships between and within the five currently described species (Barbus amatolicus, B. anoplus, B. breviceps, B. gurneyi and B. motebensis). In order to achieve such goals, distinct morphologic and molecular analyses were performed to accurately assess the intra- and inter-populations variability patterns. Fifteen meristic and 22 morphometric traits were studied in a total of 1,042 specimens (most of them housed at SAIAB and AMG Museums), including types specimens. Main significant meristic variables were: nb, number of barbels; and SLL, number of tubules along the lateral line. Two new populations were observed: ‘Barbus’ “Transkei” and ‘Barbus’ “Mozambique”. Analyses confirmed distinct populations of B. gurneyi, B. amatolicus, and B. breviceps. However, B. anoplus and B. motebensis were still presenting low discrimination. Geometric morphology approach, based on 15 landmarks from 348 specimens, showed significant variation between CBSC populations by presenting two major groups: 1) ‘Barbus’ “Transkei” and 2) B. anoplus. A minor group undefined included [B. amatolicus + B. breviceps + B. gurneyi + B. motebensis]. All genetic sequences obtained for cytb, COI and RAG1 genes were analyzed to establish phylogenetic relationships. Results evidenced that original species represent at least nine well defined lineages. By matching all approaches, results evidenced that all five studied species represent nine lineages corresponding to 11 populations: B. ?anoplus typica “Karoo”, B. ?anoplus oraniensis “HighVeld”, B. ?anoplus “Southern Cape”, ?B. motebensis “LowVeld-Incomati”, ?B. motebensis “LowVeld-Phongolo”, ‘Barbus’ “Transkei-Amatola”, ‘Barbus’ “Transkei-KwaZulu Natal”; three described species (B. amatolicus, B. gurneyi, and B. breviceps) and one undescribed species (‘Barbus’ “Mozambique”). Furthermore, new revision is necessary to complete the overall group phylogeny. Indeed, new species descriptions might be anticipated eventually rehabilitating previous CBSC designations.
Autores principais:Costa, Luís Daniel Moreira da, 1969-
Assunto:Barbus Morfometria geométrica Morfologia Filogenia Teses de doutoramento - 2013
Ano:2013
País:Portugal
Tipo de documento:tese de doutoramento
Tipo de acesso:acesso restrito
Instituição associada:Universidade de Lisboa
Idioma:inglês
Origem:Repositório da Universidade de Lisboa

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