9 documents found, page 1 of 1
Food web attributes to assess spatial–temporal dynamics in estuarine benthic ec...
Vieira, Soraia; Maurer, Anne-France; Barrocas Dias, Cristina; Neves, Joana; Martins, Marta; Lobo-Arteaga, Jorge; Adao, Helena; Scrocynska, KasiaThreatened benthic ecosystems need urgent tools for effective bioassessment and relevant management. EU Marine Strategy Framework Directive (MSFD) obligates member states to achieve GES (Good Environmental Status) for 11 descriptors of environmental state (MSFD; 2008/56/EC). From all of the descriptors, D4 that focuses on Food Webs is the most functional-oriented indicator, but also the most challenging to impl...
Exploring subsurface fluid flow and active dewatering along the oceanic plate b...
Hensen, Christian; Adao, Helena; Batista, L; Belosa, L; Bodenbinder, A; Cherednichenko, S; Domeyer, B; Duarte, J; Glombitza, C; Kaul, N; Koppe, M; Li, JR/V Meteor cruise M162 was conducted as a systematic continuation of ongoing work dedicated to understand if and howfluid flow through crust and sedimentscontinues along transform-type plate boundaries and fracture zones away from mid-ocean ridges and continental margins. Central target was the Gloria Fault in the central Northeast Atlantic. Previous findings along the eastern continuation of the Gloria Fault r...
M162 – GLORIA FLOW: Exploring subsurface fluid flow and active dewatering along...
Adao, Helena; Sroczynska, KatarzynaBetween 06.03.2020 and 11.04.2020 a R/V Meteor cruise M162 was conducted along the unexplored area of the Gloria Fault between the Azores Plateau and the Madeira-Tore Rise in the central Northeast Atlantic.The results obtained during the cruise might have important implications concerning the alteration of oceanic lithosphere and their control on tectonic and seismic activity as well as the spread of chemosyn t...
Food web analysis of meiobenthos in estuarine seagrss bed.
Vafeiadou, Anna-Maria; Materatski, Patrick; Adao, Helena; De Troch, Marleen; Moens, HelenaThis study examines the resource use and trophic position of nematodes and harpacticoid copepods at a genus/species level in an estuarine food web in Zostera noltii beds and in adjacent sediments, using natural abundances of stable carbon and nitrogen isotopes. Microphytobenthos is among the main resources of most taxa, but seagrass-associated resources also contribute to meiobenthos nutrition, with seagrass de...
Recovery of Benthic Nematodes Assemblages After a Major Collapse in Seagrass Be...
Materatski, Patrick; Vafeiadou, Anna-Maria; Moens, T.; Adão, Helena; Adao, HelenaDuring 2008, Zostera noltii seagrass beds of the Mira estuary (SW coast of Portugal) suffered a total collapse. During 2009 symptoms of early recovery were observed. The availability of pre-collapse data and the sequence of sudden collapse followed by early and gradual recovery create a rare natural experiment on recovery and resilience of seagrass ecosystems. The principal goal of this study is to assess the e...
Spatial distribution of subtidal meiobenthos along estuarine gradients in two S...
Alves, Ana; Adao, Helena; Patricio, J.; Neto, J. M.; Costa, Maria Jose; Marques, J.C.Abstract The spatial variation in abundance and composition of subtidal meiobenthos communities was studied in two Portuguese estuaries under distinct degrees of anthropogenic pressure. Samples were collected from 20 sampling stations along both estuarine gradients from freshwater (<0.5) to euhaline areas (>30). Of these stations 11 were located in the Mondego estuary, a system exposed to high anthropogenic str...
Spatial patterns of subtidal nematodes and macrofauna assemblages along the est...
Adao, Helena; Medeiros, João; Alves, Ana; Chainho, Paula; Costa, Lino; Costa, M. J.; Marques, J. C.In transitional waters the definition of reference conditions must take into account the natural variability. Therefore, prior to the use of environmental quality assessment tools the estuarine stretches reflecting different physical-chemical and biological conditions should be defined in order to correctly establish the benthic specific reference conditions. The main goal of this study is the definition of hom...
Nematodes vs Macrofauna assemblages along an estuarine gradient (Mondego estuar...
Adao, Helena; Patricio, J.; Alves, Ana; Neto, J. M.; Teixeira, H.; Marques, J.C.The spatial distribution of the nematodes and macrofauna communities in the subtidal sediments along estuarine gradient in the Mondego estuary was studied. The main aim is to compare the response of the nematodes and macrofauna communities structure adjusted for each estuarine stretch. Spatial distribution of nematode assemblages followed the estuarine gradients, allowing to distinguish: The freshwater and olig...
Variação da distribuição espacial das comunidades meiobentónicas dos sedimentos...
Adao, Helena; Alves, Ana; Marques, J. C.Esta apresentação oral Analisa o padrão de distribuição espacial das comunidades subtidais de meiofauna ao longo dos gradientes estuarinos, nomeadamente ao longo dos gradientes de salinidade. Concluindo quea composição trófica das comunidades de nemátodes parecem permitir distinguir o efeito do stress natural do stress antropogénico na variabilidade das comunidades meiobentónicas .