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Registros recuperados: 15 | |
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Grose, Susan O.; Pendleton, Linwood; Leathers, Amanda; Cornish, Andrew; Waitai, Sheridan. |
Climate change is expected to dramatically alter the distribution of many marine megafauna, impacting the people and economies that depend upon them. We build on the recent literature by developing a framework to describe the effects these changes will have on marine megafauna. With the goal to assist policymakers and grass roots organizers, we identify three illustrative pathways by which climate change drives these range shifts: (1) effects on habitat and shelter, (2) impacts on reproduction and disease, and (3) changing distribution of sources of food. We examine non-climate factors that may constrain or enable megafauna to adapt, creating winners and losers both for the species and the people dependent upon them. Finally, we comment on what management... |
Tipo: Text |
Palavras-chave: Climate change; Marine megafauna; Habitat loss; Disease; Range shifts; Prey. |
Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75354/76152.pdf |
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Gastauer,Markus; Meira Neto,João Augusto Alves. |
Ecological theory predicts that, in mature ecosystems, species richness, the number of individuals and the biomass of individuals will remain in a relatively stable state of equilibrium. The aim of this study was to test that theory. In 2001 and 2010, we conducted censuses of all trees with a circumference at breast height > 10 cm in a one-hectare plot in a seasonal semideciduous old-growth forest in southeastern Brazil. We compared the two censuses in terms of species richness and diversity, computing growth, recruitment and mortality rates, as well as gains and losses of basal area. Between 2001 and 2010, species richness declined from 224 to 218 species and the basal area increased from 37.86 to 40.16 m² ha-1. Overall turnover (the mean... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community dynamics; Habitat loss; Immigration rate; Landscape fragmentation; Species richness. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200004 |
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Mazel, Florent; Renaud, Julien; Guilhaumon, Francois; Mouillot, David; Gravel, Dominique; Thuiller, Wilfried. |
In analogy to the species-area relationship (SAR), one of the few laws in ecology, the phylogenetic diversity-area relationship (PDAR) describes the tendency of phylogenetic diversity (PD) to increase with area. Although investigating PDAR has the potential to unravel the underlying processes shaping assemblages across spatial scales and to predict PD loss through habitat reduction, it has been little investigated so far. Focusing on PD has noticeable advantages compared to species richness (SR), since PD also gives insights on processes such as speciation/extinction, assembly rules and ecosystem functioning. Here we investigate the universality and pervasiveness of the PDAR at continental scale using terrestrial mammals as study case. We define the... |
Tipo: Text |
Palavras-chave: Conservation biogeography; Habitat loss; Null models; Phylogenetic diversity; Species-area relationship; Strict nested design. |
Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00610/72248/71049.pdf |
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Eigenbrod, Felix; Geomatics and Landscape Ecology Research Laboratory, Department of Biology, Carleton University, Ottawa, Canada; felix.eigenbrod@gmail.com; Hecnar, Stephen J.; Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada; shecnar@lakeheadu.ca; Fahrig, Lenore; Geomatics and Landscape Ecology Research Laboratory, Department of Biology, Carleton University, Ottawa, Ontario Canada; lfahrig@ccs.carleton.ca. |
Tipo: Peer-Reviewed Reports |
Palavras-chave: Accessible habitat; Amphibian decline; Anuran populations; Ecological thresholds; Forests; Fragmentation; Habitat loss; Piecewise regression; Road ecology.. |
Ano: 2009 |
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ESPINOZA,CLAUDIA L; MURÚA,MAUREEN; BUSTAMANTE,RAMIRO O; MARÍN,VÍCTOR H; MEDEL,RODRIGO. |
The indirect impact of flower herbivory on plant reproduction depends on the pollination environment, particularly on the presence or absence of pollinator species with the ability to discriminate damaged from undamaged flowers. The change in pollinator assemblages, due to habitat modification, may modify the impact of flower herbivory on plant reproductive success. In this work, we evaluate the effect of flower herbivory on the seed production of Viola portalesia (Gay) in two contrasting environments, a native and low-disturbed habitat and an extensively transformed habitat characterized by Pinus radiata plantations. Even though the two habitats differed substantially in the composition of pollinator assemblages and visitation rate, the flower damage... |
Tipo: Journal article |
Palavras-chave: Flower herbivory; Habitat loss; Maulino forest; Pinus radiata; Pollination. |
Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400012 |
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GREZ,AUDREY A.; ZAVIEZO,TANIA; REYES,SUSANA. |
Habitat loss and fragmentation are considered as the main causes of biodiversity depression. Habitat loss implies a reduction of suitable habitat for organisms, and habitat fragmentation is a change in the spatial configuration of the landscape, with the remaining fragments resulting more or less isolated. Recent theory indicates that the effects of habitat loss are more important than those of habitat fragmentation, however there are few experimental studies evaluating both processes separately. To test the effects of habitat fragmentation per se on the abundance, species richness and diversity of epigeal coleopterans, 15 (30 x 30 m) alfalfa micro-landscapes, distributed in three blocks, were created. On twelve of them, 84 % of the habitat was removed,... |
Tipo: Journal article |
Palavras-chave: Habitat fragmentation; Habitat loss; Micro-landscapes; Diversity of epigeal beetles. |
Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300013 |
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Pedó,Ezequiel; Freitas,Thales R. O. de; Hartz,Sandra M.. |
Grazing and fire, used in pasture regeneration practices, are inter-related activities in livestock management. Both activities affect habitat characteristics by changing the structure of the herbaceous and shrubby vegetation, reducing their biomass and litter cover. This study evaluated the effect of fire and livestock grazing on the assemblage of non-flying small mammals in grassland-Araucaria forest ecotones in southern Brazil. We compared four areas frequently affected by livestock management with four protected areas. Surveys were carried out in four sampling periods, one in each season of 2004. We captured a total of 325 individuals from 12 species of rodents - Akodon montensis Thomas, 1913, Akodon paranaensis Christoff, Fagundes, Sbalqueiro, Mattevi... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Campos; Didelphimorphia; Habitat loss; Rodentia. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000400005 |
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Alteff,Eduardo França; Gonsioroski,Gustavo; Barreiros,Marcelo; Torres,Leonardo Gabriel Campos de Oliveira; Camilo,André Restel; Mozerle,Hugo Borghezan; Sousa,Antônio Emanuel Barreto Alves de; Medolago,César Augusto Bronzatto; Martínez,Carlos; Lima,Diego Mendes; Ubaid,Flávio Kulaif; Mendonça,Eloisa Neves; Tomotani,Barbara Mizumo; Silveira,Luís Fábio. |
Abstract The Belem Curassow (Crax fasciolata pinima) is one of the most endangered birds in South America, without sightings of birds in the wild for 40 years. This subspecies is nationally and internationally classified as critically endangered and close to extinction, suffering from poaching and deforestation in its range. Here we present new records of free-living individuals made on three indigenous lands in Pará and Maranhão states: in part of Terra Indígena Mãe Maria, Bom Jesus do Tocantins, Pará; in locations within the Reserva Biológica do Gurupi/Terra Indígena Alto Turiaçu, Centro Novo do Maranhão, Maranhão; and around the Terra Indígena Rio Pindaré, Alto Alegre do Pindaré, Maranhão. We also provide recommendations to protect this bird via a... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mutum-pinima; Indigenous lands; Reserva Biológica do Gurupi; Habitat loss; Poaching. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100246 |
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Registros recuperados: 15 | |
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