Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Biota Neotropica (1) Ecology and Society (1) Neotropical Ichthyology (1) Autor Aquino,Pedro De Podestà Uchôa de (1) Davic, Robert D; Ohio Environmental Protection Agency; r_davic@yahoo.com (1) Dotta,Graziela (1) Fonseca,Claudia Padovesi (1) Schneider,Mariana (1) Silva,Maria Júlia Martins (1) Verdade,Luciano M. (1) Mais... Palavra-chave Feeding guilds (3) Agroecosystems (1) Biomass dominance (1) Competition (1) Dominance (1) Functional groups (1) Keystone species (1) Power laws (1) Relative abundance (1) Seasonal variation (1) Species diversity (1) Species richness (1) Stream fish (1) Trophic ecology (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Peer-Reviewed Reports (1) Ano 2011 (1) 2007 (1) 2003 (1) País Brazil (2) Canada (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Linking Keystone Species and Functional Groups: A New Operational Definition of the Keystone Species Concept Ecology and Society Davic, Robert D; Ohio Environmental Protection Agency; r_davic@yahoo.com. The concept of the "keystone species" is redefined to allow for the a priori prediction of these species within ecosystems. A keystone species is held to be a strongly interacting species whose top-down effect on species diversity and competition is large relative to its biomass dominance within a functional group. This operational definition links the community importance of keystone species to a specific ecosystem process, e.g., the regulation of species diversity, within functional groups at lower trophic levels that are structured by competition for a limited resource. The a priori prediction of keystone species has applied value for the conservation of natural areas. Tipo: Peer-Reviewed Reports Palavras-chave: Keystone species; Competition; Dominance; Feeding guilds; Functional groups; Power laws; Species diversity; Biomass dominance. Ano: 2003 Trophic categories in a mammal assemblage: diversity in an agricultural landscape Biota Neotropica Dotta,Graziela; Verdade,Luciano M.. Mammals play an important role in the maintenance and regeneration of tropical forests since they have essential ecological functions and can be considered key-species in structuring biological communities. In landscapes with elevated anthropogenic pressure and high degree of fragmentation, species display distinct behavioral responses, generally related to dietary habits. The landscape of Passa-Cinco river basin, in the central-eastern region of São Paulo State, shows a high degree of anthropogenic disturbance, with sugar cane plantations, eucalyptus forests, native semideciduous forest remnants and pastures as the key habitat types in the region. We surveyed medium to large mammals in those habitats and determined species richness and relative abundance... Tipo: Info:eu-repo/semantics/article Palavras-chave: Species richness; Relative abundance; Feeding guilds; Agroecosystems. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000200031 Trophic structure of a fish community in Bananal stream subbasin in Brasília National Park, Cerrado biome (Brazilian Savanna), DF Neotropical Ichthyology Schneider,Mariana; Aquino,Pedro De Podestà Uchôa de; Silva,Maria Júlia Martins; Fonseca,Claudia Padovesi. The aim of this study was to determine the trophic structure of the fish community in the Bananal stream subbasin, which belongs to a well-preserved Cerrado area (Brazilian Savanna) in Brasília National Park, Brazil. We also evaluated the influence of environmental variations in the diet of fish species. Four samples were taken in each 30 m long established transect, two in the rainy season and two in the dry season. A total of 1,050 stomachs of the 13 most abundant species were analyzed. A total of 36 food items were consumed, where 24 were autochthonous, 8 allochthonous, and 4 of undetermined origin. Non-metric multidimensional scaling (NMDS) analysis, in addition to the results of frequency of occurrence and abundance charts, was used to determine four... Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding guilds; Seasonal variation; Stream fish; Trophic ecology. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300011 Registros recuperados: 3 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco