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| Registros recuperados: 203 | |
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| Bittencourt,Abílio C.S.P.; Leão,Zelinda M.A.N.; Kikuchi,Ruy K.P.; Dominguez,José M.L.. |
| This paper shows that the location of the shoreface bank reefs along the northeastern and eastern coasts of Brazil, in a first order approximation, seem to be controlled by the deficit of sediment in the coastal system. The sediment transport pattern defined by a numerical modeling of wave refraction diagrams, representing circa 2000 km of the northeastern and eastern coasts of Brazil, permitted the regional-scale reproduction of several drift cells of net longshore sediment transport. Those drift cells can reasonably explain the coastal sections that present sediment surplus or sediment deficit, which correspond, respectively, to regions where there is deposition and erosion or little/no deposition of sand. The sediment deficit allows the exposure and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sediment deficit; Longshore drift; Coral reefs; Northeast Brazil. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100015 |
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| PINHEIRO,BARBARA R.; PEREIRA,NATAN S.; AGOSTINHO,PAULA G.F.; MONTES,MANUEL J.F.. |
| ABSTRACT Coral reefs are one of the most vulnerable ecosystems to ocean warming and acidification, and it is important to determine the role of reef building species in this environment in order to obtain insight into their susceptibility to expected impacts of global changes. Aspects of the life history of a coral population, such as reproduction, growth and size-frequency can contribute to the production of models that are used to estimate impacts and potential recovery of the population, acting as a powerful tool for the conservation and management of those ecosystems. Here, we present the first evidence of Siderastrea stellata planulation, its early growth, population size-frequency distribution and growth rate of adult colonies in Rocas Atoll. Our... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate change; Coral reefs; Rocas Atoll; Siderastrea stellata; South Atlantic Ocean. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300873 |
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| Nunes,José de Anchieta Cintra da Costa; Medeiros,Diego Valverde; Reis-Filho,José Amorim; Sampaio,Cláudio Luis Santos; Barros,Francisco. |
| Although recreational spearfishing is a growing activity, its impacts are poorly understood. This paper aims to present data on reef fishes captured by recreational spearfishing in the Bahia State, Northeastern Brazil. We analyzed 168 photos of spearfishing conducted in the reefs of this region between 2006 and 2008. A total of 1.121 fish belonging to 48 species were captured in three sub-regions of the Bahia coastline: Litoral Norte (LN), Salvador (SSA) and Baixo Sul (BS). The main species caught were: Scomberomorus brasiliensis (n = 191), Sphyraena barracuda (n = 153), Lutjanus jocu (n = 150) and Caranx bartholomaei (n = 141); these four species represented 56.5% of total captures. Over the sampling period, the highest values of catch rates per day were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Overfishing; Coral reefs; Salvador; Litoral Norte; Baixo Sul. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000100014 |
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| Millán,Santiago; García-Valencia,Carolina. |
| ABSTRACT In order to contribute to the sea bottoms knowledge of the Seaflower Biosphere Reserve (RB Seaflower), a mapping update was made at 1:50,000 scale of the Seascape Ecological Units (SEU) for the Serrana, Roncador and Quitasueño atolls, based on the processing and interpretation of ALOS AVNIR - 2 satellite images acquired in 2012. For the attribute assignation was used as reference cartographic products, fieldwork data, and ecological descriptions of the benthic community. A total of 138,967 ha and 30 SEU, which corresponds to 32,908 ha for Serrana, 4,861 to Roncador and 101,198 to Quitasueño. The products generated represents a good approximation of the location, extension and distribution of the benthic seascape elements, constituting the base... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Marine atlas; Ecological units; Coral reefs; Cartography.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100197 |
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| Gómez-Cubillos,Catalina; Gavio,Brigitte; Zea,Sven. |
| ABSTRACT Algal turfs are currently the most abundant benthic component on most coral reefs. Their wide distribution, functional role and positive response to factors that stress corals confirm their importance in the functioning of reef ecosystem. It has been shown that species composition, structural development and sediment retention influence their capacity to kill and displace adjacent live coral tissue. In this study in two reefs of the Tayrona National Natural Park (Colombian Caribbean), the variation in structure of turfs growing on and in direct interaction with massive live corals was determined, and its structural complexity was related with its sediment retention capacity. For that, the taxonomical composition was determined, and canopy height,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coral reefs; Algal turfs; Interactions; Structure of algal assemblages; Sediment retention; Colombian Caribbean.. |
| Ano: 2020 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000300045 |
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| Vega-Sequeda,Johanna; Agudelo-Ramírez,Claudia; Mendoza-Mazzeo,Álvaro; Sanjuan-Muñoz,Adolfo. |
| ABSTRACT Coral reefs have experienced an extensive degradation over the last decades as a result of anthropogenic and natural disturbances. This study presents an historical characterization (1989-2015) of changes in composition of the substrate in coral formations in the San Bernardo Archipelago. In addition, in 2015 coral reef health (presence of deterioration signs) was evaluated, and satellite temperature data were analyzed. In general, coral cover showed a stable trend between 1989 and 2010. The observed differences in the coral reef formations in 2013 and 2015 could have been due to the increase in coverage of species of the genus Orbicella, Porites, Agaricia, Siderastrea and the hydrocoral Millepora complanata. The lower coverage in 1989, 1991 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coral reefs; Coral monitoring; Reef cover; Corales del Rosario y San Bernardo Natural National Park; Colombian Caribbean.. |
| Ano: 2020 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000300167 |
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| Mayal,Elga Miranda; Neumann-Leitão,Sigrid; Feitosa,Fernando Antônio do Nascimento; Schwamborn,Ralf; Silva,Tâmara de Almeida e; Silva-Cunha,Maria da Glória Gonçalves da. |
| This study provides baseline information on the hydrological conditions and on the coral and plankton communities at the Maracajaú reef ecosystem (Northeastern Brazil). Studies were performed from February to June 2000, covering the transition from dry to rainy season. In this area, there is an offshore coral reef formation, where corals were observed in loco; the water samples were collected to obtain the hydrological and plankton data. Six scleractinian species were identified. Stable isotope analysis on the carbonate fraction of Favia gravida fragments showed that these corals were under severe thermal stress. Chlorophyll-a varied from 1.1 to 9.3 mg m-3, with higher values during the rainy season. Average zooplankton wet weight biomass were 117.0... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coral reefs; Hydrology; Plankton; Thermal stress; Human impacts. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300019 |
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| Melbourne-Thomas, Jessica; University of Tasmania; Jessica.MelbourneThomas@utas.edu.au; Johnson, Craig R; University of Tasmania; craig.johnson@utas.edu.au; Perez, Pascal; University of Wollongong; pascal.perez@csiro.au; Eustache, Jeremy; Australian National University; jeremy.eustache@voila.fr; Fulton, Elizabeth A; CSIRO Wealth from Oceans Flagship; Beth.Fulton@csiro.au; Cleland, Deborah; Australian National University; deborah.cleland@anu.edu.au. |
| Transdisciplinary approaches that consider both socioeconomic and biophysical processes are central to understanding and managing rapid change in coral reef systems worldwide. To date, there have been limited attempts to couple the two sets of processes in dynamic models for coral reefs, and these attempts are confined to reef systems in developed countries. We present an approach to coupling existing biophysical and socioeconomic models for coral reef systems in the Mexican state of Quintana Roo. The biophysical model is multiscale, using dynamic equations to capture local-scale ecological processes on individual reefs, with reefs connected at regional scales by the ocean transport of larval propagules. The agent-based socioeconomic model simulates... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Biophysical; Coral reefs; Coupled models; Decision support; Socioeconomic; Social– Ecological systems. |
| Ano: 2011 |
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| Kittinger, John N; Center for Ocean Solutions, Stanford University; Impact Assessment, Inc.; jkittinger@gmail.com; Finkbeiner, Elena M; Hopkins Marine Station, Stanford University; elenafinkbeiner@gmail.com; Glazier, Edward W.; Impact Assessment, Inc.; edward.glazier@gmail.com; Crowder, Larry B.; Center for Ocean Solutions, Stanford University; Hopkins Marine Station, Stanford University; Larry.Crowder@Stanford.edu. |
| Coral reefs are among the most diverse ecosystems on the planet but are declining because of human activities. Despite general recognition of the human role in the plight of coral reefs, the vast majority of research focuses on the ecological rather than the human dimensions of reef ecosystems, limiting our understanding of social relationships with these environments as well as potential solutions for reef recovery. General frameworks for social-ecological systems (SESs) have been advanced, but system-specific approaches are needed to develop a more nuanced view of human-environmental interactions for specific contexts and resource systems, and at specific scales. We synthesize existing concepts related to SESs and present a human dimensions framework... |
| Tipo: Peer-Reviewed Synthesis |
Palavras-chave: Coral reefs; Human dimensions; Reciprocity; Social science; Social-ecological systems; Sustainability science. |
| Ano: 2012 |
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| Dinsdale, Elizabeth A; Biology Department, San Diego State University; elizabeth_dinsdale@hotmail.com. |
| Integrating information from a range of community members in environmental management provides a more complete assessment of the problem and a diversification of management options, but is difficult to achieve. To investigate the relationship between different environmental interpretations, I compared three distinct measures of anchor damage on coral reefs: ecological measures, perceptual meanings, and subjective health judgments. The ecological measures identified an increase in the number of overturned corals and a reduction in coral cover, the perceptual meanings identified a loss of visual quality, and the health judgments identified a reduction in the health of the coral reef sites associated with high levels of anchoring. Combining the perceptual... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Coral reefs; Perceptual meanings; Social-ecological assessments. |
| Ano: 2009 |
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| Kramer, Daniel B; Michigan State University; dbk@msu.edu. |
| The utility of traditional bio-economic harvest models suffers from their dependence on two commonly used approaches. First, optimization is often assumed for harvester behavior despite system complexity and the often neglected costs associated with information gathering and deliberation. Second, ecosystem interactions are infrequently modeled despite a growing awareness that these interactions are important. This paper develops a simulation model to examine the consequences of harvesting at two trophic levels in a coral-reef food web. The model assumes adaptive rather than optimizing behavior among fishermen. The consequences of changing economic, biological, and social parameters are examined using resilience as an evaluative framework. Three general... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Fisheries; Resource economics; Coral reefs; Resilience; Adaptive behavior; Food web; Simulation. |
| Ano: 2008 |
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| Evans, Louisa S.; The School of International Development, University of East Anglia; louisa.evans@jcu.edu.au; Brown, Katrina; The School of International Development, University of East Anglia; k.brown@uea.ac.uk; Allison, Edward H.; The WorldFish Center; e.allison@cgiar.org. |
| Adaptive governance can be conceptualized as distinct phases of: 1) understanding environmental change; 2) using this understanding to inform decision making; and 3) acting on decisions in a manner that sustains resilience of desirable system states. Using this analytical framework, we explore governance in practice in two case studies in Kenya, that reflect the “messiness” of contemporary coastal governance in many developing country contexts. Findings suggest that adaptive marine governance is unlikely to be a smooth process of learning, knowledge sharing, and responding. There are institutional, sociocultural, and political factors, past and present, that influence each phase of both local and state decision making. New local... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Coral reefs; Coastal zone; Fisheries; Governance; Inclusion; Knowledge; Participation. |
| Ano: 2011 |
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| Registros recuperados: 203 | |
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