30 documents found, page 1 of 3
Diversity, distribution and ecology of benthic molluscan communities on the Por...
Martins, R.; Sampaio, L.; Quintino, V.; Rodrigues, A. M.The diversity, ecology and distribution patterns of the Portuguese continental shelf malacofauna and its relationship with abiotic factors were studied from samples covering the western and the southern coast. A total of 2544 specimens were identified corresponding to 169 taxa, mostly bivalves (62% of the total taxa). Abra alba was the most abundant and the most frequent species. The alpha diversity ranged from...
Sr-Nd isotope signatures of surficial sediments from the Portuguese continental...
Martins R.; Ribeiro S.; Silva, A.J.F.; Freitas, R.; Quintino, V.; Rodrigues, A.M.; Azevedo, M.R.This study focus on the Sr-Nd isotope signatures of detrital and carbonate fractions of seven samples from surficial sediments deposited in the Portuguese continental shelf. 87Sr/86Sr and 143Nd/144Nd isotope compositions of the lithic component are used to constrain potential endmember contributions and determine sediment provenance. The 87Sr/86Sr ratios measured in the acid leachates of the seven sediment samp...
A broad scale seabed substrate map of the Portuguese coast
Martins, R.; Azevedo, M.R.; Silva, A.J.F.; Mamede, R.; Ricardo, F.; Magalhães, L.; Monteiro, P.; Bentes, L.; Gonçalves, J.M.S.; Quintino, V.The MeshAtlantic project aimed to generate a broad-scale habitat map for the shelf and coastal area of the Atlantic Area. Till 2012, a detailed seabed substrate map of the Portuguese coast, which covers a great extension of the Western Iberian coast, was not known.
Distribution of soft bottom sediments in the Portuguese Continental Shelf
Silva, A.J.F.; Azevedo, M.R.; Martins, R.; Mamede, R.; Ricardo, F.; Magalhães, L.; Monteiro, P.; Bentes, L.; Gonçalves, J.M.S.; Quintino, V.This work presents a simplified map of the spatial distribution of surficial sediments and rock outcrops along the Portuguese continental shelf in ArcGIS format. Nearly 500 samples of soft bottom shelf sediments were collected in the scope of several research projects and analyzed for grain-size. Based on the raw grain-size data, the samples were classified according to a modified version of the Folk classifica...
Diversity, distribution and ecology of the family Syllidae (Annelida) in the Po...
Martins, R.; Magalhães, L.; Peter, A.; San Martín, G.; Rodrigues, A. M.; Quintino, V.The diversity, distribution and ecology of the family Syllidae along the Western Iberian coast was studied, based on 145 sediment samples covering the whole Portuguese coastal shelf and 30 Saccorhiza polyschides holdfasts sampled in the north of Portugal. A total of 55 species were identified in 2,306 specimens. A total of 33 species were recorded in the holdfasts and 36 in the shelf samples spanning a wide ran...
Diversity and spatial distribution patterns of the soft-bottom macrofauna commu...
Martins, R.; Quintino, V.; Rodrigues, A. M.This study presents a comprehensive assessment of the diversity and spatial distribution of the soft-bottom benthic macrofauna communities along the Portuguese continental shelf and discusses the relationship between biological and environmental data. A total of 145 sites were sampled using a 0.1m2Smith-McIntyre grab covering the whole west and south coast of Portugal, at depths ranging 13 and 195m. More than 3...
Soft-bottom portuguese continental shelf polychaetes: diversity and distribution
Martins, R.; Sampaio, L.; Rodrigues, A. M.; Quintino, V.This study fulfills a gap in the knowledge of the annelid polychaete fauna from most of the Western Iberian coast, a particular biogeographic area where boreal, cold temperate, warm temperate and subtropical faunas can co-occur. A total of 145 samples covering the entire Portuguese continental shelf were analyzed to study the diversity and spatial distribution of the polychaetes and to discuss the relationship ...
Sedimentary and geochemical characterization and provenance of the Portuguese c...
Martins, R.; Azevedo, M.R.; Mamede, R.; Sousa, B.; Freitas, R.; Rocha, F.; Quintino, V.; Rodrigues, A.M.Grain-size and geochemical analyses for soft-bottom sediments from the Portuguese continental shelf are used to determine their provenance and to identify the main factors governing the sediment distribution patterns. The deeper areas of the northwestern and central sectors of the Portuguese shelf and most of its southwestern sector are covered by fine and very fine sands. Coarse deposits are found in the inner...
A Bottom Sediment Distribution Map for the Portuguese Continental Shelf in ArcG...
Silva, A.J.F.; Azevedo, M.R.; Martins, R.; Mamede, R.; Ricardo, F.; Magalhães, L.; Monteiro, P.; Bentes, L.; Gonçalves, J.M.S.; Quintino, V.This work presents a simplified map of the spatial distribution of surficial sediments and rock outcrops along the Portuguese continental shelf in ArcGIS format. Preliminary map preparation involved scanning, georeferencing and digitizing of pre-existing base maps from the Portuguese Hydrographic Institute and harmonization with other published and non-published cartographic information. Samples of soft bottom ...
Bacterial communities associated with the decomposition of Fucus vesiculosus in...
Martins, P.; Lopes, M. L.; Rodrigues, A. M.; Gomes, N. C. M.; Quintino, V.In this work we study the temporal and spatial patterns of the bacterial communities associated with the decomposition of Fucus vesiculosus and a control substrate in a transitional ecosystem. Leaf-bags with 5 mm mesh-size and containing the experimental substrates were placed in three areas, euhaline, mesohaline and limnetic, covering the full salinity gradient. The substrates were submerged at day 0 and three...