Browsing by Author "Oliveira, Paulo"
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- Phylogenetic relationships of gadfly petrels Pterodroma spp. from the Northeastern Atlantic Ocean: molecular evidence for specific status of Bugio and Cape Verde petrels and implications for conservationPublication . Jesus, José; Menezes, Dília; Gomes, Sara; Oliveira, Paulo; Nogales, Manuel; Brehm, AntónioIt is widely accepted that the gadfly petrels of the Macaronesian islands comprise three closely related and morphologically similar taxa, Petrodroma madeira from Madeira island, P. deserta (also treated as P. feae deserta) from Bugio and P. feae (also treated as P. feae feae) from Cape Verde Islands. However, the taxonomic rank of each taxon is not well defined, and has been subject to a long debate. Partial sequences of cytochrome b (893 bp) from 39 individuals (five from Madeira, 18 from nearby Bugio, and 16 from Fogo) and morphometric data from five characters from 102 individuals (74 from Bugio and 28 from Fogo in Cape Verde), were used to compare and estimate phylogenetic relationships and the taxonomic status of these petrels. In the phylogenetic analysis and sequence divergence estimation, we also include 23 sequences of 19 Pterodroma species available from GenBank. Our results show that Macaronesian gadfly petrels form a monophyletic clade. Birds from Bugio and Cape Verde are the most closely related taxa followed by those from Madeira. The group formed by the three taxa studied is closely related to Bermuda Petrel P. cahow and Black-capped Petrel P. hasitata. A hypothesis for the colonization of the islands is presented. The level of sequence divergence is sufficient to consider the populations of Bugio and Cape Verde as separate species. Reproductive isolation is supported by exclusive haplotypes and fixed changes. Despite the presence of some significant differences in bill and tarsus measurements, the two species seem to be morphologically similar because the great overlap of variation intervals in the measurements hinders identification. It therefore appears suitable for consideration as a cryptic species. An important conservation implication is that the world population of both species is very small; if treated as a full species, deserta on Bugio may qualify for uplisting to ‘Vulnerable’ on the IUCN Red List.
- Who values what in a tourism destination? The case of Madeira IslandPublication . Oliveira, Paulo; Pereira, Pedro TelhadoThis research studies the importance placed on different aspects of a tourism destination – Madeira Island – at the time tourists make their decision to visit. The authors use an ordered probit model to see how the socio-demographic characteristics of the tourists and different aspects of the trip affect the valuation given to 30 different aspects of the destination. They conclude that males tend to value 12 of the aspects less, while valuing golf more. Older tourists place a higher value on the scenery of the destination and a lower value on the more active/sport aspects. The more educated tourists value levadas (man-made water channels with pathways used for pedestrian walks) more and organized tours less. British tourists value the climate and Portuguese tourists value extreme sports. These results are very useful when preparing any marketing strategy and extremely important when preparing development plans for the tourism sector.