Santos M.N.,Instituto Nacional Dos Recursos Biologicos Inrb Ip L Ipimar |
Oliveira M.T.,Oceanario de Lisbon S.A |
Oliveira M.T.,University of Algarve |
Curdia J.,Instituto Nacional Dos Recursos Biologicos Inrb Ip L Ipimar |
Curdia J.,University of Aveiro
Journal of the Marine Biological Association of the United Kingdom | Year: 2013
Tourism is a growing activity in Cape Verde, which can lead to more intensive and uncontrolled fishing and diving activities, affecting the quality of marine habitats. To mitigate this biodiversity problem, a private diving operator, supported by the local authorities, decided to deploy the first artificial reefs (ARs) in the Archipelago just off Santa Maria Bay (Sal Island). To evaluate the ARs capacity to promote marine fish biodiversity in Santa Maria Bay, the fish assemblages were compared to those from nearby natural reefs (NRs), located at the same depth (10 and 28Â m depth), by means of visual census. All study sites were surveyed by visual census in August 2009. A total of 64 species were recorded, mostly consisting of sedentary and/or benthophagous demersal species, followed by highly-sedentary benthic cryptic species. 'Tchuklassa' NR showed the highest species richness (58 species), while the lowest was recorded at 'Santo Antão' AR (48 species). An overall positive relationship was observed between habitat rugosity and mean species richness. The results showed a high percentage of common species on both reef types. Higher mean values of community descriptors (number of species, Shannon-Weaver diversity index, Simpson dominance index and equitability) and fish density were found on the ARs, with slightly higher densities recorded on the deeper reefs. These results suggest that ARs can have an important role promoting the local fish biodiversity and supporting local sustainable development of diving tourism. Copyright © 2012 Marine Biological Association of the United Kingdom.
Cardoso C.,Instituto Nacional Dos Recursos Biologicos Inrb Ip L Ipimar |
Mendes R.,Instituto Nacional Dos Recursos Biologicos Inrb Ip L Ipimar |
Vaz-Pires P.,Abel Salazar Biomedical Sciences Institute |
Vaz-Pires P.,CIIMAR - Interdisciplinary Center of Marine and Environmental |
Nunes M.L.,Instituto Nacional Dos Recursos Biologicos Inrb Ip L Ipimar
LWT - Food Science and Technology | Year: 2011
The effects of MTGase (5 g/kg, w/w) and dietary fibre (inner pea fibre, 40 g/kg, w/w, carrageenan, 10 g/kg, w/w, carrageenan + konjac flour, 10 + 10 g/kg, w/w) on heat-induced gels from sea bass (Dicentrarchus labrax) trimmings were studied. MTGase incorporation had a positive effect on texture: gel strength and force at rupture increased. MTGase reduced protein solubility, meaning greater protein aggregation, according to electropherograms. Pea fibre had no positive effects: texture was quite similar to that of the control products and WHC was reduced. Carrageenan addition had no deleterious effect upon the texture of the gels and made them harder and springier. Force at rupture (even without MTGase) and WHC were greatly improved. Combination of carrageenan and konjac further enhanced these effects. For those gels without MTGase, protein solubility in urea and urea + DTT was reduced by both fibres, suggesting a reduction of hydrogen bonding between proteins. © 2010 Elsevier Ltd.
Lino P.G.,Instituto Nacional Dos Recursos Biologicos Inrb Ip L Ipimar |
Bentes L.,University of Algarve |
Oliveira M.T.,Oceanario de Lisbon AS Esplanada D. Carlos I |
Erzini K.,University of Algarve |
Santos M.N.,Instituto Nacional Dos Recursos Biologicos Inrb Ip L Ipimar
Brazilian Journal of Oceanography | Year: 2011
The African hind Cephalopholis taeniops (Valenciennes, 1828) is one of the most important commercial demersal species caught in the Cape Verde archipelago. The species is closely associated with hard substrate and is one of the main attractions for SCUBA divers. In January 2006 a former Soviet fishing vessel - the Kwarcit - was sunk off Santa Maria Bay (Sal Island). Young C. taeniops are commonly observed in this artificial reef (AR). In order to investigate the species' use of the AR, 4 specimens were captured and surgically implanted underwater with Vemco brand acoustic transmitters. The fish were monitored daily with an active telemetry receiver for one week after release. Simultaneously, an array of 3 passive VR2/VR2W receivers was set for 63 days, registering data that allowed an analysis of spatial, daily and short term temporal activity patterns. The results showed site fidelity to the AR, with no migrations to the nearby natural reef. The method used allowed to register a consistent higher activity during daytime and a preference for the area opposite the dominant current.