A5028825204- Marine Bivalve and Aquaculture Studies
- Marine and fisheries research
- Marine Biology and Ecology Research
- Coral and Marine Ecosystems Studies
- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Coastal and Marine Management
- Marine and coastal plant biology
- Marine Biology and Environmental Chemistry
- Aquaculture Nutrition and Growth
- Environmental Toxicology and Ecotoxicology
- Aquatic Invertebrate Ecology and Behavior
- Geotourism and Geoheritage Conservation
- Crustacean biology and ecology
- Urban and sociocultural dynamics
- Geological and Geophysical Studies Worldwide
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Mediterranean and Iberian flora and fauna
- Coastal wetland ecosystem dynamics
- Insect and Arachnid Ecology and Behavior
- Plant and animal studies
- Soil Management and Crop Yield
- Plant Pathogens and Resistance
- Oil Palm Production and Sustainability
Universidade Estadual de Campinas (UNICAMP)
2024
Instituto de Investigacao das Pescas e do Mar
1998-2009
University of Algarve
2003
Annual reproductive cycles of two commercially important bivalves, the razor clam Ensis siliqua and Venus striatula were investigated. Specimens both species sampled monthly from a site off Vilamoura, south Portugal, between June 1992 May 1993. Gonadal development was monitored using standard histological methods. Observed gametogenic progression categorized by six stages: (0) inactive; (I) early active gametogenesis; (II) late (HI) ripe; (IV) partially spawned; (V) spent. Both males females...
Abstract Artificial reefs have been deployed along the southern coast of Portugal (Algarve) since 1990 to enhance artisanal fisheries. The objectives this study were to: (1) describe colonisation process; (2) assess role artificial in terms juvenile recruitment and growth as mating/spawning areas (3) evaluate potential near shore fishing grounds for three economically important fish species, Diplodus bellottii (Steindachner), sargus (L.) vulgaris (Geoffroy Saint‐Hilaire). assemblages...
Abstract The white clam Spisula solida is harvested along the entire coast of Portugal using mechanical dredges. In this study, total direct mortality macrobenthic community caused by three types dredges (north dredge—ND, traditional dredge—TD, and metallic grid dredge—GD) used in S. fishery was determined compared. relationship between catching efficiency for each type dredge also assessed. Our results showed significant differences ND both GD TD This difference largely attributed to...
Experiments on the selectivity of clam and razor dredges were carried out during July 1995, south coast Portugal. The effects mesh size tooth spacing investigated for both dredges. Four different sizes (25, 35, 40, 50 mm) three spacings (15, 20, 25 mm clams Spisula solida Venus striatula, 10, 15, 20 Ensis siliqua) used. results indicated that did not have an effect selectivity. best 40 fishery (S. V. striatula) 66 (E. siliqua). These will result in considerable reduction numbers small-...
The gametogenic cycle of the smooth clam Callista chione off Arrábida region was studied throughout a 17-month period (from January 2004 to May 2005) using standard histological techniques, mean oocyte diameters and condition index. This species showed synchronism between sexes both in terms development spawning. results indicated that sex-ratio not significantly different from parity. In 2004, had already begun ended late October 2004. Three spawning peaks were detected: January–March,...
Shell growth of the razor clam Ensis siliqua (Mollusca: Bivalvia) from southern Portugal has been analysed using both surface rings and internal shell microgrowth patterns. The rate estimated an analysis is slower (von Bertalanffy growth, constant K=0·27) than that determined annual narrowing patterns present in sections (K=0·65), although methods predict a similar asymptotic length, L∞, 144·8 139·6 mm, respectively. Barrinha population occurs heavily dredged area reveals presence series...
In order to examine how substratum colonisation can affect community structure, a 1-year study was conducted at the Faro/Ancao artificial reef (Algarve, Portugal). of hard communities, motile species are usually neglected and only conspicuous taken into account. Therefore, development vagile sessile components epibiotic were analysed separately. Differences between assemblages on horizontal surfaces, but not vertical detected. Multivariate analysis detected differences in macrobenthic...
Abstract Gaspar, M. B., Carvalho, S., Constantino, R., Tata-Regala, J., Cúrdia, and Monteiro, C. 2009. Can we infer dredge fishing effort from macrobenthic community structure? – ICES Journal of Marine Science, 66: 2121–2132. The effects commercial (FE) on structure were analysed in geographically related grounds separated into three groups: non-exploited (NE), moderately exploited (ME), highly (HE). Number species, abundance, Margalef species richness, Shannon–Wiener diversity significantly...
The effect of dredging on bottom structure was assessed, to estimate the damage inflicted benthic macrofauna left dredge path and evaluate aggregations scavengers within track. Sediment suspended during rapidly resettled both sand sandy-mud bottoms. Dredge tracks were deeper sediments persisted longer than in sandy sediments. disappearance sediment types depended current strength wave action. Damage mortality induced by macrobenthic animals relatively low. Post-fishing SCUBA diver...