Encontrados 27 documentos, a visualizar página 1 de 3
Benthic meiofauna as indicator of ecological changes in estuarine ecosystems: T...
Alves, Ana Sofia; Adão, Helena; Ferrero, T.; Marques, J.C.; Costa, M. J.; Patricio, J.Estuarine meiofauna communities have been only recently considered to be good indicators of ecological quality, exhibiting several advantages over macrofauna, such as their small size, high abundance, rapid generation times and absence of a planktonic phase. In estuaries we must account not only for a great natural variability along the estuarine gradient (e.g. sediment type and dynamics, oxygen availability, t...
Benthic meiofauna as indicator of ecological changes in estuarine ecosystems: T...
Alves, Ana; Adão, Helena; Ferrero, T.J; Marques, J.C; Costa, Maria Jose; Patricio, J.a b s t r a c t Estuarine meiofauna communities have been only recently considered to be good indicators of ecological quality, exhibiting several advantages over macrofauna, such as their small size, high abundance, rapid generation times and absence of a planktonic phase. In estuaries we must account not only for a great natural variability along the estuarine gradient (e.g. sediment type and dynamics, oxygen...
Temporal and spatial variation in the Nazaré canyon (Western Iberian margin): I...
Ramalho, Sofia; Adão, Helena; Kiriakoulakis, K.; Wolff, G.A.; Vanreusel, A.; Ingels, J.The Nazaré canyon on the Portuguese Margin (NE Atlantic) was sampled during spring-summer for three consecutive years (2005 - 2007), permitting the first inter-annual study of the meiofaunal communities at the Iberian Margin at two abyssal depths (~3500 m and ~4400 m). Using new and already published data, the meiofauna standing stocks (abundance and biomass) and nematode structural and functional diversity we...
Benthic Nematode assemblages response to seagrass beds spatial heterogeneity in...
Materatski, Patrick; Moens, Tom; Vafeiadou, Anna-Maria; Adão, HelenaAfter a seagrass beds (Zostera noltii) colapse in 2008 of the Mira estuary (SW coast of Portugal) symptoms of early recovery were observed. The principal goal of this study is to assess the evolution and resilience of the benthic nematodes assemblages during the natural recovery of the seagrass beds through analysis of the spatial and temporal differences in structural and functional characteristics of the com...
Temporal and spatial meiofauna patterns in the Nazaré Submarine Canyon, Northea...
Ramalho, Sofia; Ingels, Jeroen; Adão, Helena; VanreuseL, AnnSubmarine canyons are characterized by highly heterogeneous habitats, topography and hydrography with enhanced organic matter input. These factors have a profound effect on canyon faunal communities in time and space. As part of the HERMES project, one of the largest European canyons, the Nazaré canyon was sampled in spring-summer in three consecutive years (2005, 2006, 2007), permitting the study of inter-annu...
Food sources of macrobenthos in an estuarine seagrass habitat (Zostera noltii) ...
Vafeiadou, Anna-Maria; Materatski, Patrick; Adão, Helena; De Troch, Marleen; Moens, TomStable carbon and nitrogen isotope analysis was used to examine the resources and position of macrobenthos in an estuarine seagrass food web in two sampling moments, during summer and winter. The contribution of each food source to the carbon requirements of consumers was estimated by a mixing model. The used carbon sources were largely seagrass associated, although seagrass tissues were utilized by only few sp...
Sample acidification effects on carbon and nitrogen stable isotope ratios of ma...
Vafeiadou, Anna-Maria; Adão, Helena; De Troch, Marleen; Moens, TomAcidification treatment has been used in most stable isotope studies to eliminate inorganic non-dietary carbon, allowing d13C measurement of organic carbon needed for trophic studies. Because only limited information about the acidification effects on isotopic ratios exists in the literature, we provide an assessment of such effects for a wide range of benthic macroinvertebrates from estuarine intertidal sedime...
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...
Benthic Nematodes Assemblages as Indicators of Spatial Heterogeneity in Early N...
Adão, Helena; Materatski, Patrick; Vafeiadou, Anna-Maria; Moens, TomDuring 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 ...
Do nematode and macrofauna assemblages provide similar ecological assessment in...
Alves, Ana; Adão, Helena; Costa, Maria Jose; Marques, J.C.; Patricio, J.Do nematode and macrofauna assemblages provide similar ecological assessment information? To answer this question, in the summer of 2006, subtidal soft-bottom assemblages were sampled and environmental parameters were measured at seven stations covering the entire salinity gradient of the Mondego estuary. Principal components analysis (PCA) was performed on the environmental parameters, thus establishing differ...
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