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| Registros recuperados: 60 | |
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| Sellier, Marion; Poitevin, Pierre; Goraguer, Herle; Faure, Jean-marie; Goulletquer, Philippe. |
| Initiated in 2013, the present work carried out in 2014 extends the monitoring network focusing on marine invasive exotic species in Saint-Pierre and Miquelon archipelago. In a global context of coastal ecosystems’ changes, accentuated by direct or indirect effects of human activities, it became essential to implement a monitoring survey and to track the expansion of marine invasive species along Saint-Pierre and Miquelon shoreline. Fukui traps and tunicates collectors deployed on different stations as well as the timely completion of observational dives, have provided the following conclusions: several invasive species were again reported within the local marine ecosystem. Those species, i.e., Carcinus maenas, Caprella mutica, Ciona intestinalis,... |
| Tipo: Text |
Palavras-chave: Marine Invasive species; Saint-Pierre and Miquelon; Aquaculture; Ecosystem; Espèces marines invasives; Saint-Pierre et Miquelon; Aquaculure; Ecosystème. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00312/42303/41635.pdf |
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| Rice, Jake; Rochet, Marie-joelle. |
| We develop a framework for the objective selection of a suite of indicators for use in fisheries management. The framework encompasses eight steps, and provides guidance on pitfalls to be avoided at each step. Step I identifies user groups and their needs, featuring the setting of operational objectives, and Step 2 identifies a corresponding list of candidate indicators. Step 3 assigns weights to nine screening criteria for the candidate indicators: concreteness, theoretical basis, public awareness, cost, measurement, historic data, sensitivity, responsiveness, and specificity. Step 4 scores the indicators against the criteria, and Step 5 summarizes the results. Steps 3-5 offer technical aspects on which guidance is provided, including scoring standards... |
| Tipo: Text |
Palavras-chave: Scoring; Objectives; Indicators; Guidelines; Framework; Ecosystem; Criteria. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-484.pdf |
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| Bertrand, Jacques; Cochard, Marie-laure; Coppin, Franck; Le Pape, Olivier; Mahe, Jean-claude; Morin, Jocelyne; Poulard, Jean-charles; Rochet, Marie-joelle; Schlaich, Ivan; Souplet, Arnauld; Trenkel, Verena; Verin, Yves. |
| The scientist community, the fishing organisations and all involved parties show a growing interest in an integrated project management of the sea space exploited by fishing communities. A key to reach such a target is to make available reliable and precise scientist data on the different components of the fishing systems. For about twenty years, and in its mission to support the development of an integrated management for a sustainable use of marine resources, Ifremer has been organising monitoring campaigns of fishery resources along the shores of France. These campaigns aim at providing abundance indicator on species of interest. They consequently provide an essential knowledge base to characterize and trace the status of exploited fish and... |
| Tipo: Text |
Palavras-chave: Ecosystem; Indicating; Oceanographical campaign; Scientific research; Fishing halieutic; Fishing; English Channel; Bay of Biscay; France; Invertebrate; Pisces; Ecosystème; Indicateur; Campagne océanographique; Recherche scientifique; Pêche halieutique; Pêche; Mer du nord; Golfe de gascogne; Manche; France; Invertebrate; Pisces. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/rapport-1091.pdf |
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| Food and Agriculture Organization of the United Nations (FAO),World Conservation Monitoring Centre (WCMC),Center for International Earth Science Information Network (CIESIN),World Resources Institute,International Food Policy Research Institute,Global Maritime Boundaries Database (GMBD),The International Society for Mangrove Ecosystems (ISME), |
| Tipo: Journal Contribution |
Palavras-chave: Country profile; Angola; Ecosystem; Ecosystems. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/570 |
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| Tsur, Yacov; Zemel, Amos. |
| We study the management of a natural resource that supports ecosystems as well as human needs. The reduction in the resource base poses a threat of occurrence of catastrophic ecological events, such as the sudden collapse of the natural habitat, that lead to severe loss of biodiversity. The event occurrence conditions involve uncertainty of various types, and the distinction among these types affects the optimal exploitation policies. When uncertainty is due to our ignorance of some aspects of the underlying ecology, the isolated equilibrium states characterizing optimal exploitation for many renewable resource problems become equilibrium intervals, giving rise to hysteresis phenomena. Events triggered by genuinely stochastic environmental conditions... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Ecosystem; Resource management; Event uncertainty; Biodiversity; Extinction; Resource /Energy Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/14996 |
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| Jiang, Yong; Swallow, Stephen K.; Paton, Peter. |
| Establishing habitat corridors has been an important strategy in many conservation practices. Nonetheless, the existing literature has ignored the role habitat corridors could play in reserve network design. Based on modern ecological theory, the effectiveness of a reserve system largely depends on its connectivity, but it is less clear how recent spatial modeling of reserve network design improves the connectivity of the reserve system as required by population persistence in a highly fragmented, heterogeneous landscape. This study explicitly incorporates the idea of habitat corridor into optimal reserve design, an approach which might significantly reduce the uncertainty brought by land use change or a source-sink habitat matrix. More importantly, by... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Nature reserve; Ecosystem; Spatial configuration; Amphibian; Environmental Economics and Policy. |
| Ano: 2005 |
URL: http://purl.umn.edu/19440 |
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| Richardson, Robert B.. |
| Food security in developing countries depends in part on the sustainable use of natural resources. Food security is usually examined through three dimensions, namely the availability, access, and utilization of food. Ecosystems directly and indirectly support each of these dimensions through the provision of critical ecosystem services that facilitate agricultural production, create income- generating opportunities, and provide energy for cooking. However, in some cases, household uses of natural resources undermine particular elements of food security, hindering national poverty reduction strategies and threatening the sustainability of critical ecosystem functions. I examine the role of ecosystem services in rural food security through the lens of its... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Environmental sustainability; Ecosystem; Food security; Environmental Economics and Policy; Food Security and Poverty. |
| Ano: 2011 |
URL: http://purl.umn.edu/98782 |
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| Tsur, Yacov; Zemel, Amos. |
| We study the management of a natural resource that supports ecosystems as well as human needs. The reduction in the resource base introduces a threat of occurrence of catastrophic ecological events, such as the sudden collapse of the national habitat that lead to severe loss of biodiversity. The event occurrence conditions involve uncertainty of various types, and the distinction among these types affects the optimal exploitation policies. When uncertainty is due to our ignorance of some aspects of the underlying ecology, the isolated equilibrium states characterizing optimal exploitation for many renewable resource problems become equilibrium intervals. Events triggered by genuinely stochastic environmental conditions maintain the structure of... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Ecosystem; Resource management; Event uncertainty; Biodiversity; Extinction; Resource /Energy Economics and Policy. |
| Ano: 2005 |
URL: http://purl.umn.edu/14981 |
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| Levins,Richard; Miranda,Ileana. |
| In the present work, the models of dynamics ecological populations were described. The development of the models, in order to describe these populations was presented. They have evolved from an independent way to the models that represent the evaluation of epidemiology in humans. The differential equations that describe the relationships prey-predator, crop-pest and migration effect were shown. It was also described the possibility to represent these models by means of equations in difference and computerized simulation systems. The interconnection between a mathematical model and the ecosystem stability according to the biological parameters was showed. Ecological questions that can be answered analyzing the models were approached. |
| Tipo: Journal article |
Palavras-chave: Mathematical models; Prey; Predator; Migration; Ecosystem. |
| Ano: 2007 |
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1010-27522007000100001 |
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| Calvo,Jorge O.; Porfiri,Juan D.; González-Riga,Bernardo J.; Kellner,Alexander W.A.. |
| A unique site at the northern area of Patagonia (Neuquén, Argentina) reveals a terrestrial ecosystem preserved in a detail never reported before in a Late Cretaceous deposit. An extraordinary diversity and abundance of fossils was found concentrated in a 0.5 m horizon in the same quarry, including a new titanosaur sauropod, Futalognkosaurus dukei n.gen., n.sp, which is the most complete giant dinosaur known so far. Several plant leaves, showing a predominance of angiosperms over gymnosperms that likely constituted the diet of F. dukei were found too. Other dinosaurs (sauropods, theropods, ornithopods), crocodylomorphs, pterosaurs, and fishes were also discovered, allowing a partial reconstruction of this Gondwanan continental ecosystem. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dinosauria; Titanosauria; Ecosystem; Taphonomy; Upper Cretaceous; Gondwana; Patagonia; Argentina. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300013 |
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| DEL-CLARO,KLEBER; TOREZAN-SILINGARDI,HELENA MAURA. |
| Abstract: As a focus for conservation efforts, biodiversity has received increased attention in the last fifty years. Searching for patterns in biodiversity, researchers have suggested studies including: ecological communities, cladistics classifications, hierarchical compositions of different levels of organization, and groups of taxonomically related species. Here, we propose that the study of the biodiversity of interactions may present a new perspective in the efforts to conserve biodiversity, especially in endangered ecosystems like the tropical savannas. We suggest that Cerrado, like other tropical savannas, is a particularly important ecosystem in which we can direct efforts to explain what determines the major part of variation in the outcomes of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ant-plant interactions; Ecosystem; Tropical savanna; Veredas. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600614 |
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| Zhang,Zhenguo; Zhou,Jun. |
| ABSTRACT: Biodiversity plays a key role in human welfare by providing agricultural, economic, and health benefits. However, following the industrial revolution, the rapid expansion of the human population and subsequent economic activities have caused a dramatic loss in global biodiversity, resulting in significant disturbances to ecosystems and our own living conditions. Accordingly, the conservation of biodiversity has become one of the most important challenges for humanity. The vast numbers of plants, animals, and microorganisms, the enormous genetic diversity of these species and the different ecosystems to which these organisms belong are all part of a biologically diverse planet. A substantial proportion of the world’s biodiversity has been... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiversity; Ecosystem; Agriculture; Conservation; Genetics; Human welfare. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000500400 |
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| Registros recuperados: 60 | |
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