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| Registros recuperados: 13 | |
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| Mouillot, David; Gaillard, Sylvain; Aliaume, Catherine; Verlaque, Marc; Belsher, Thomas; Troussellier, Marc; Chi, Thang. |
| Lagoons are highly productive areas representing more than 50% of the coastline area in Languedoc-Roussillon (South of France, Mediterranean sea). These lagoons are very different in their environmental conditions, human influences, eutrophication levels and aquaculture intensity. Based on macrophyte communities associated with soft substrates, two indices of taxonomic diversity (the "average taxonomic distinctness" (Delta(+)) and the "variation in taxonomic distinctness" (Lambda(+))) were used to discriminate four of these lagoons (Thau, Salse-Leucate, Bages-Sigean and Mauguio). Bages-Sigean presented a significant higher average taxonomic distinctness (p < 0.05) and Salse-Leucate had a significant higher variation in taxonomic distinctness (p <... |
| Tipo: Text |
Palavras-chave: Languedoc Roussillon; Exotic species; Human impact; Eutrophication; Biodiversity. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-748.pdf |
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| Thevenon, Florian; Williamson, David; Bard, Edouard; Anselmetti, Flavio S.; Beaufort, Luc; Cachier, Helene. |
| This paper addresses the quantification of combustion-derived products in oceanic and continental sediments by optical and chemical approaches, and the interest of combining such methods for reconstructing past biomass burning activity and the pyrogenic carbon cycle. In such context, the dark particles >0.2 mu m(2) remaining after the partial digestion of organic matter are optically counted by automated image analysis and defined as charcoal, while the elemental carbon remaining after thermal and chemical oxidative treatments is quantified as black carbon (BC). The obtained pyrogenic carbon records from three sediment core-based case studies, (i) the Late Pleistocene equatorial Pacific Ocean. (ii) the mid-Holocene European Lake Lucerne, and (iii) the... |
| Tipo: Text |
Palavras-chave: Biomass burning; Carbon cycle; Charcoal; Black carbon; Climate; Human impact. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00231/34198/32764.pdf |
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| FERNANDEZ,MIRIAM; JARAMILLO,EDUARDO; MARQUET,PABLO A; MORENO,CARLOS A; NAVARRETE,SERGIO A; OJEDA,F. PATRICIO; VALDOVINOS,CLAUDIO R; VASQUEZ,JULIO A. |
| Despite Chile has been one of the pioneering countries in studies of human impact on marine communities, and despite the enormous economic and social significance that the marine environment has for the country, the development of marine conservation programs and the scientific basis for sustainability has not kept pace, with the exploitation rate of marine fisheries and the increasing use of the coast for other purposes. Although we think that the establishment of any conservation policies along the vast coastline of Chile must be based on a multitude of approaches and considerations, scientific, biological, and ecological principles should guide much of these efforts. In this paper, we attempt to present a general overview of the current knowledge about... |
| Tipo: Journal article |
Palavras-chave: Chile; Marine conservation; Biogeographical patterns; Community structure; Human impact. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400021 |
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| Morsing, Jonas; Department of Geosciences and Natural Resource Management, University of Copenhagen; nkx236@alumni.ku.dk; Frandsen, Sally Ida; Department of Geosciences and Natural Resource Management, University of Copenhagen;; Vejre, Henrik; Department of Geosciences and Natural Resource Management, University of Copenhagen; hv@life.ku.dk; Raulund-Rasmussen, Karsten; Department of Geosciences and Natural Resource Management, University of Copenhagen; krr@life.ku.dk. |
| Ecological restoration is becoming a main component in nature management; hence, its definitions and interpretations of the underlying principles are widely discussed. In Denmark, restoration has been implemented for decades, and the LIFE Nature program has contributed to several large-scale projects. Our aim was to indicate tendencies in Danish nature policy by analyzing a representative sample of nature management projects. Using qualitative document analyses of official reports, we investigated how well 13 LIFE Nature cofinanced projects undertaken in Denmark fit with the principles of ecological restoration, as formulated in the nine attributes of the Society for Ecological Restoration’s Primer on Ecological Restoration, and based on the five... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Benchmark; Ecological restoration; Human impact; LIFE Nature; Natura 2000; Nature policy; Semicultural landscapes; SER attributes. |
| Ano: 2013 |
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| Santos,Mauricio Beux dos; Oliveira,Mauro Cesar Lamim Martins de; Gonçalves,Tatiane Penteado; Almeida,Francis de Mattos; Loebmann,Daniel; Tozetti,Alexandro Marques. |
| The loss and modification of habitats by humans have been considered key factors in the decline of diversity of species worldwide. However, the real effect caused by these disturbances on the biota is still poorly understood. The assessment of the changes in the network of interspecific interactions, such as predation rates on the native fauna, can be an important tool to diagnose the functionality of disturbed ecosystems. In this study we evaluate the predation rate on snakes in coastal grasslands in South America under human influence. Predation rate of artificial snakes, unlike that obtained in other studies, was lower in human-altered areas than preserved ones. Our findings may be due to a reduction in the abundance and/or richness of species of native... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reptiles; Coastal dunes; Human impact; Predation; Brazil. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000100039 |
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| Ilarri,Martina Di Iulio; Souza,Allan Tainá de; Medeiros,Paulo Roberto de; Grempel,Renato Grotta; Rosa,Ierecê Maria de Lucena. |
| The effects of tourist visitation and food provisioning on fish assemblages were assessed by visual censuses (stationary technique) carried out in a tropical reef in Northeastern Brazil. Comparisons of species abundance, richness, equitability, and trophic structure in the presence (PT) and absence (AT) of tourists suggest that tourist visitation and supplementary food influenced the structure of the fish assemblage, as follows: (a) diversity, equitability and species richness were significantly higher on the AT period, while the abundance of a particular species was significantly higher during PT; (b) trophic structure differed between the AT and PT periods, omnivores being more abundant during the latter period, while mobile invertivores, piscivores,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish behavior; Tourism; Human impact; Northeastern Brazil; Abudefduf saxatilis. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400014 |
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| Perera-Pérez, O.; González-Díaz, S.P.; Álvarez Fernández, S.; González-Sanson, G.. |
| La investigación se llevó a cabo entre abril del 2006 y mayo del 2007. El objetivo fue determinar la estructura de las poblaciones de Porites astreoides, Agaricia agaricites y Acropora palmata en crestas de arrecifes de la región noroccidental de Cuba. Los indicadores ecológicos seleccionados fueron: talla media (diámetro mayor y altura), composición por clases de tallas y parámetros de la distribución de frecuencias de tallas (moda, asimetría, curtosis, desviación estándar y coeficiente de variación). Los valores medios de diámetro y altura estimados para P. astreoides en el arrecife de Los Colorados fueron superiores (11,2 ± 0,3 cm y 6,7 ± 0,2 cm, respectivamente) a los obtenidos en Playa Baracoa y Rincón de Guanabo, mientras que los de A.... |
| Tipo: Journal Contribution |
Palavras-chave: Reefs; Size distribution; Human impact; Recruitment. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4545 |
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| Shepherd,John D.; Ditgen,Rebecca S.. |
| Small mammals were sampled in five closed, humid, Araucaria araucana forests that differed in the degree of anthropogenic disturbance in southwestern Neuquén province. Nine species were captured in 3416 trap nights. Abrothrix longipilis and Oligoryzomys longicaudatus made up 88% of all captures. Small mammal relative abundance was 52 times higher where grazing was absent compared to a site with intense grazing pressure. Seed predation, primarily by livestock and feral exotic mammals, varied from 59.7% to 15.1% of marked seeds per day. Small mammal community productivity and composition were correlated with understory structure (Mantel test, r = 0.529, p = 0.04), and with rates of seed predation (r = -0.91, n = 4, p = 0.08). Forests with less complex... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Araucaria araucana; Exotic species; Human impact; Seed predation; Small mammals. |
| Ano: 2005 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832005000200008 |
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| Bird, Michael I.; Hutley, Lindsay B.; Lawes, Michael J.; Lloyd, Jon; Luly, Jon G.; Ridd, Peter V.; Roberts, Richard G.; Ulm, Sean; Wurster, Christopher M.. |
| Debate concerning the environmental impact of human arrival in Australia has continued for more than a century. Here we review the evidence for human impact and the mechanisms by which humans may have affected the environment of tropical Australia. We limit our review to tropical Australia because, over three decades ago, it was proposed that the imposition of an anthropogenic fire regime upon human occupation of the Australian continent may have resulted in profound changes in regional vegetation and climate across this region. We conclude that ecological processes and vegetation-fire-climate-human feedbacks do exist that could have driven a significant shift in boundary conditions and ecosystem state at the sub-continental scale through the sustained... |
| Tipo: Text |
Palavras-chave: Human impact; Megafaunal extinction; Tropical palaeoclimate; Fire regime; Ecosystem change. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00291/40179/39079.pdf |
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| Nantke, Carla K. M.; Frings, Patrick J.; Stadmark, Johanna; Czymzik, Markus; Conley, Daniel J.. |
| Si fluxes from the continents to the ocean are a key element of the global Si cycle. Due to the ability of coastal ecosystems to process and retain Si, the ‘coastal filter’ has the potential to alter Si fluxes at a global scale. Coastal zones are diverse systems, sensitive to local environmental changes, where Si cycling is currently poorly understood. Here, we present the first palaeoenvironmental study of estuarine biogenic silica (BSi) fluxes and silicon isotope ratios in diatoms (δ30Sidiatom) using hand-picked diatom frustules in two sediment cores (CBdist and CBprox) from the Chesapeake Bay covering the last 12000 and 8000 years, respectively. Constrained by the well-understood Holocene evolution of the Chesapeake Bay, we interpret variations in Si... |
| Tipo: Text |
Palavras-chave: Diatoms; Estuarine sediments; Human impact; Si isotopes. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00589/70083/68065.pdf |
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| Registros recuperados: 13 | |
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