Consulta: subjectFacets:"Coastal ecosystems"
Registros recuperados: 10
Data/hora: 01/06/2024 14:17:42

Elasticity in ecosystem services: exploring the variable relationship between ecosystems and human well-being
Provedor de dados: 7
Autores: Daw, Tim M.; Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden; tim.daw@su.se; Hicks, Christina C.; Lancaster Environment Centre, Lancaster University, UK; Center for Ocean Solutions, Stanford University, Monterey, California, USA; ARC Center of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia; christina.c.hicks@gmail.com; Brown, Katrina; Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, UK; katrina.brown@exeter.ac.uk; Chaigneau, Tomas; Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, UK; T.W.B.Chaigneau@exeter.ac.uk; Januchowski-Hartley, Fraser A.; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK; f.a.hartley@gmail.com; Cheung, William W. L.; Nippon Foundation-Nereus Program, Institute for the Oceans and Fisheries, The University of British Columbia, Vancouver, B.C., Canada; w.cheung@oceans.ubc.ca; Crona, Beatrice; Global Economic Dynamics and the Biosphere, Royal Swedish Academy of Science, Stockholm, Sweden; Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden; beatrice.crona@su.se; Coulthard, Sarah; Northumbria University, Newcastle upon Tyne, UK; sarah.coulthard@northumbria.ac.uk; Sandbrook, Chris; United Nations Environment Programme World Conservation Monitoring Centre, Cambridge, UK; Department of Geography, University of Cambridge, Cambridge, UK; chris.sandbrook@unep-wcmc.org; Perry, Chris; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK; C.Perry@exeter.ac.uk; Muthiga, Nyawira A.; Wildlife Conservation Society, Marine Program, Bronx, New York, USA; Wildlife Conservation Society, Marine Program Kenya, Mombasa, Kenya; nmuthiga@wcs.org; Bosire, Jared; WWF Kenya, Nairobi, Kenya; jbosire@wwfkenya.org; McClanahan, Tim R.; Wildlife Conservation Society, Marine Program, Bronx, New York, USA; tmcclanahan@wcs.org.
Although ecosystem services are increasingly recognized as benefits people obtain from nature, we still have a poor understanding of how they actually enhance multidimensional human well-being, and how well-being is affected by ecosystem change. We develop a concept of &amp;#8220;ecosystem service elasticity&amp;#8221; (ES elasticity) that describes the sensitivity of human well-being to changes in ecosystems. ES Elasticity is a result of complex social and ecological dynamics and is context dependent, individually variable, and likely to demonstrate nonlinear dynamics such as thresholds and hysteresis. We present a conceptual framework that unpacks the chain of causality from ecosystem stocks through flows, goods, value, and shares to contribute to the...
Tipo: Peer-Reviewed Reports
Palavras-chave: Coastal ecosystems; Conceptual framework; East Africa; Environmentalists&amp;#8217; ; Fisheries; Mangroves; Paradox.
Ano: 2016

Challenges in adaptive management of riparian and coastal ecosystems
Provedor de dados: 7
Autores: Walters, Carl; University of British Columbia; c.walters@fisheries.ubc.ca.
Many case studies in adaptive-management planning for riparian ecosystems have failed to produce useful models for policy comparison or good experimental management plans for resolving key uncertainties. Modeling efforts have been plagued by difficulties in representation of cross-scale effects (from rapid hydrologic change to long-term ecological response), lack of data on key processes that are difficult to study, and confounding of factor effects in validation data. Experimental policies have been seen as too costly or risky, particularly in relation to monitoring costs and risk to sensitive species. Research and management stakeholders have shown deplorable self-interest, seeing adaptive-policy development as a threat to existing research programs and...
Tipo: Peer-Reviewed Reports
Palavras-chave: Adaptive management; Coastal ecosystems; Ecosystem management; Fisheries; Institutional barriers; Management experiments; Modeling; Riparian ecosystems; Simulation.
Ano: 1997

Zinc isotopes as tracers of anthropogenic sources and biogeochemical processes in contaminated mangroves
Provedor de dados: 5
Autores: Ferreira Araujo, Daniel; Machado, Wilson; Weiss, Dominik; Mulholland, Daniel S.; Garnier, Jeremie; Souto-oliveira, Carlos E.; Babinski, Marly.
Recent work has shown that variations in zinc (Zn) isotope ratios enable us to identify contamination sources in the terrestrial environment and uptake processes in higher plants. Here in this study, we demonstrate that this also holds true for mangrove forests, which play an important role in the biogeochemical cycling of metals in tropical coastal ecosystems and that are seriously threatened by anthropogenic pollution. To this end, we determined zinc concentration and isotope composition (expressed using the δ66Zn notation relative to the JMC 3-0749-L standard) in sediments and tree leaves collected from a mangrove close to Rio de Janeiro in Brazil. The δ66ZnJMC values of sediments vary between +0.36 and + 0.84‰ and fall on a mixing line between detrital...
Tipo: Text
Palavras-chave: Metal transition isotopes; Metal contamination; Mass spectrometry; Coastal ecosystems; Mangrove leaves.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00440/55196/56660.pdf

Artificial neural network analysis of factors controlling ecosystem metabolism in coastal systems
Provedor de dados: 5
Autores: Rochelle-newall, Emma. J.; Winter, Christian; Barrón, Cristina; Borges, Alberto V.; Duarte, Carlos M.; Elliott, Mike; Frankignoulle, Michel; Gazeau, Frederic; Middelburg, Jack J.; Pizay, Marie-dominique; Gattuso, Jean-pierre.
Knowing the metabolic balance of an ecosystem is of utmost importance in determining whether the system is a net source or net sink of carbon dioxide to the atmosphere. However, obtaining these estimates often demands significant amounts of time and manpower. Here we present a simplified way to obtain an estimation of ecosystem metabolism. We used artificial neural networks (ANNs) to develop a mathematical model of the gross primary production to community respiration ratio (GPP:CR) based on input variables derived from three widely contrasting European coastal ecosystems (Scheldt Estuary, Randers Fjord, and Bay of Palma). Although very large gradients of nutrient concentration, light penetration, and organic-matter concentration exist across the sites,...
Tipo: Text
Palavras-chave: Artificial neural networks; Coastal ecosystems; Metabolic balance; Primary production; Respiration.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00247/35857/34378.pdf

Variabilité spatio-temporelle de la biomasse microphytobenthique en rade de Brest et en Manche occidentale
Provedor de dados: 5
Autores: Sagan, G; Thouzeau, G.
Microphytobenthic biomass was estimated in the Bay of Brest (1994) and the western English Channel (Trezen Vraz, 1993) using spectrophotometry. Best results (42 % difference) were obtained with an instantaneous extraction procedure at room temperature, compared with the cold extraction procedure. Chlorophyll biomass in sediment was higher in the western English Channel (65-215 mg Chl a m(-2)) than in the Bay of Brest (10-113 mg Chl a m(-2)), in contrast to total pigment biomass (Chl a + pheo a : 88-254 mg m(-2) at Trezen Vraz vs. 131-934 mg m(-2) in the Bay of Brest). This study emphasized decreasing pigment biomass from the estuary to the open sea. Low benthic pigment biomass in the Bay, compared to eutrophic ecosystems, agrees with previous studies on...
Tipo: Text
Palavras-chave: Microphytobenthos; Biomasse; Écosystèmes côtiers; Forçage physique; Microphytobenthos; Biomass; Coastal ecosystems; Physical forcing.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43651/43242.pdf

Bivalve trophic ecology in the Mediterranean: Spatio-temporal variations and feeding behavior
Provedor de dados: 5
Autores: Purroy, Ariadna; Najdek, Mirjana; Isla, Enrique; Zupan, Ivan; Thebault, Julien; Peharda, Melita.
The trophic ecology of two bivalves, the clam Callista chione and the cockle Glycymeris bimaculata was studied using environmental and biochemical variables of the suspended particulate matter and the sediment. Samples were collected from two shallow sites, Pag and Cetina, in the coastal oligotrophic Mediterranean Sea, during a 17 month period. The temporal variation of the particulate matter reflected a mixture between marine and terrestrial sources throughout the year, with a clear marine influence during summer and fall, and predominance of terrestrial inputs during spring and winter. The digestive gland was a useful rapid turnover tissue, where the carbon isotope signal was species-specific and the nitrogen isotope one was site-specific. FA markers in...
Tipo: Text
Palavras-chave: Feeding ecology; Bivalves; Suspension feeder; Biochemical variables; Stable isotopes; Fatty acids; Adriatic sea; Niche partitioning; Coastal ecosystems.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00463/57478/59596.pdf

Assessment of the ecological status of coastal areas and estuaries in France, using multiple fish-based indicators: a comparative analysis on the Vilaine estuary
Provedor de dados: 5
Autores: Brind'Amour, Anik; Lobry, Jeremy.
When reviewing the various fish-based community indicators aiming at assessing the ecological status of marine communities and/or ecosystems, a typology consisting of three major components emerges. The first component highlights the choice of relevant metrics associated with a level of organization (e. g. population or community). The second relies on the method used to combine the metrics (an aggregated indicator or a synoptic table). The third refers to the type of analysis (direct or indirect) that is used to establish the link between the metrics and a given pressure. In this paper we use the Vilaine coastal-estuarine fish communities as a case study to discuss and relate two different approaches to the suggested typology. The first approach...
Tipo: Text
Palavras-chave: Coastal ecosystems; Fish communities; Indicators; Integrated approaches; Metric; Typology of fish indicators.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11174/7532.pdf

Spatial and temporal interaction between sediment and microphytobenthos in a temperate estuarine macro-intertidal bay
Provedor de dados: 5
Autores: Orvain, Francis; Lefebvre, Sebastien; Montepini, J.; Sebire, M.; Gangnery, Aline; Sylvand, B.
Intertidal flats of the estuarine macro-intertidal Baie des Veys (France) were investigated to identify spatial features of sediment and microphytobenthos (MPB) in April 2003. Gradients occurred within the domain, and patches were identified close to vegetated areas or within the oyster-farming areas where calm physical conditions and biodeposition altered the sediment and MPB landscapes. Spatial patterns of chl a content were explained primarily by the influence of sediment features, while bed elevation and compaction brought only minor insights into MPB distribution regulation. The smaller size of MPB patches compared to silt patches revealed the interplay between physical structure defining the sediment landscape, the biotic patches that they contain,...
Tipo: Text
Palavras-chave: Benthic diatoms; Benthos; Coastal ecosystems; Intertidal flats; Baie des Veys; Normandie; Spatial pattern; Geostatistics; Kriging.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00088/19945/17598.pdf

Effects that nutritional and saline gradients have on the growth of Passiflora mucronata Lam. and Canavalia rosea (Sw.) DC. found in the restinga of Brazil
Provedor de dados: 39
Autores: Lourenço Junior,Jehová; Zambom,Oberdan; Rossi,Magda Santos; Cuzzuol,Geraldo Rogério Faustini.
Salinity and fertility are the main factors cited in Within the restinga (coastal woodland) biome in Brazil, the positioning of Canavalia rosea and Passiflora mucronata occur, respectively, near the shore-in the creeping psammophyte formation (CPF) - and far from the shore - in the Palmae formation (PF). The hypothesis that such positioning is related to salinity and fertility was tested by applying a salt gradient (increasing solutions of NaCl) and a nutritional gradient (different proportions of Hoagland solution). Neither species survived in solutions over 200 mM of NaCl. The shoots of P. mucronata showed negative growth (lower dry mass) in the first week of exposure to saline solutions. The roots of C. rosea showed great sensitivity to salinity, which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal ecosystems; Fabaceae; Fertility; Nutrition; Passifloraceae; Salinity; Spatial distribution.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200008

Diet and trophic niche breadth of the neotropical cormorant [Nannopterum brasilianus (Gmelin, 1789)] in the Flora and Fauna Sanctuary Ciénaga Grande de Santa Marta, Caribbean Colombia
Provedor de dados: 50
Autores: Tette-Pomarico,Aliano; López-Peña,Arístides; Franke-Ante,Rebeca; Duarte,Luis Orlando.
ABSTRACT The neotropical cormorant (Nannopterum brasilianus) is a piscivorous bird with colonial nesting. It is distributed from southern North America to Argentina. The largest colony of N. brasilianus in Colombia is located in the locality of Punta Blanca, in the Flora and Fauna Sanctuary Ciénaga Grande de Santa Marta (FFS CGSM), in the lagoon complex with same name (LC CGSM). The diet and niche width of N. brasilianus were analyzed from pellets collected on the western edge of the Punta Blanca nesting colony during the breeding season of 2017. Prey identification was based on mainly on the morphology of the fish otoliths found in these pellets (n = 64). There were eight fish species identified in the diet of N. brasilianus of which three are new records...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acuatic birds; Swamps; Coastal ecosystems; Phalacrocoracidae.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000300193