Consulta: subjectFacets:"Trophic guilds"
Registros recuperados: 7
Data/hora: 02/06/2024 19:09:52

Assessment of fish assemblages in streams of different orders in the Upper Paraná River basin, Central Brazil
Provedor de dados: 76
Autores: Vieira,Thiago B.; Tejerina-Garro,Francisco L.
The aim of this study was to test whether the richness observed and the biomass per trophic group of fish assemblages vary depending on the order (1st and 2nd) of the streams located in three different basins of the Upper Paraná River Basin, Central Brazil. Samples were collected between April and September, 2009, in 27 streams of the Meia Ponte, Piracanjuba and Santa Maria River basins. A total of 4,879 specimens were collected distributed in 59 species and 19 families. The statistical analyses carried out indicate that the observed richness and biomass of omnivore fish were influenced by the interaction of two factors: stream order and basin. The 2nd order streams located in the Santa Maria basin presented significant differences in the observed richness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trophic guilds; Omnivores; Richness; Biomass.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000200007

Fish beta diversity responses to environmental heterogeneity and flood pulses are different according to reproductive guild
Provedor de dados: 83
Autores: Gutiérrez C,Ángela; Ortega,Jean Carlo Gonçalves; Agostinho,Angelo Antonio.
ABSTRACT In floodplain communities, beta diversity is influenced by different factors; however, environmental heterogeneity and floods are believed to be particularly influential. The influence of environmental heterogeneity and floods on beta diversity may vary among guilds that present different ecological traits. This study evaluated the correlation between the environmental heterogeneity and flood periods and the beta diversity of trophic and reproductive guilds of fish assemblages. Sampling was conducted quarterly between 2000 and 2012 in the upper Paraná River floodplain. The environmental heterogeneity and period (i.e., dry or flood) were associated with the beta diversity of each guild based on the results of generalized least squares linear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dissimilarity; Fish assemblages; Flood pulse; Reproductive guilds; Trophic guilds.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400212

Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil
Provedor de dados: 83
Autores: Rocha,Adélia R. M.; Di Beneditto,Ana Paula M.; Pestana,Inácio A.; Souza,Cristina Maria M. de.
ABSTRACT The aim of this study was to evaluate the isotopic profile and mercury (Hg) concentrations in fish (carnivores, omnivores and detritivores) in the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil. Carbon (δ13C) isotopic analyses revealed that pelagic and benthonic sources are part of the feeding of the fish from the different guilds (-14.0 to -24.8 ‰). The benthic sources are usually enriched in δ13C (-16.9‰, from watershed runoff) compared to pelagic sources because the phytoplankton, important primary producer that supports several pelagic chains, has δ13C signature lighter (-23.9‰). The nitrogen (δ15N) isotopic signatures indicated that most guilds were at the same trophic position (10.0 to 15.5 ‰), except for pelagic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon; Freshwater; Hg; Nitrogen; Trophic guilds.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400723

Ecomorphological patterns of the fish assemblage in a tropical floodplain: effects of trophic, spatial and phylogenetic structures
Provedor de dados: 83
Autores: Oliveira,Edson Fontes; Goulart,Erivelto; Breda,Luciani; Minte-Vera,Carolina Viviana; Paiva,Luiz Ricardo de Souza; Vismara,Melina Rizzato.
Ecomorphological patterns of the fish assemblage from the upper Paraná River floodplain, Brazil, were described and evaluated according to trophic (guilds), spatial (habitats) and phylogenetic (taxonomic distances) structures. The samples were obtained through the Long Term Research Project (LTER-CNPq/UEM/NUPELIA) in August and October 2001. Thirty-five species were analyzed from thirty-one morphological variables. Strong significant correlations (Mantel test) between morphology and trophic guilds and between morphology and taxonomy were found, while morphology and habitat revealed a weak correlation. However, the partial Mantel test showed that the correlations between morphology and trophic guilds persist even when the effect of taxonomy is discounted....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecomorphology; Ecomorphotypes; Trophic guilds; Habitat diversity; Phylogeny; Upper Paraná River.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300002

DIET OF SOME PASSERINES IN SOUTH COAST OF ESPÍRITO SANTO STATE, BRAZIL
Provedor de dados: 84
Autores: SABINO,URSOLA; MORAIS,RODRIGO; DUCA,CHARLES.
ABSTRACT Studies about diet of birds in Atlantic Forest are scarce. In this study, we characterized the diet of Passeriformes from the south coast of Espírito Santo State, Brazil, classifying them into trophic guilds. From 26 species a total of 94 samples were obtained by regurgitation using tartar emetic method. The 855 items found were separated into two different categories: Insects (includes other terrestrial arthropods, such as spiders and opiliones) and Fruits/Seeds. The most frequent food item was Coleopterans, and the most abundant was Hymenoptera.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Emetic tartar; Restinga; Trophic guilds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492017002900387

Structural differences in mammal assemblages between savanna ecosystems of the Colombian Llanos
Provedor de dados: 84
Autores: Castillo-Figueroa,Dennis; Martínez-Medina,Daniela; Rodríguez-Posada,Miguel E.; Bernal-Vergara,Sandra.
Abstract The Colombian Orinoquia region is characterized by a high diversity of mammals, which is associated with complex ecosystems that include large extensions of Neotropical savannas (known locally as “Llanos Orientales”). Despite accelerated anthropogenic transformations in savanna ecosystems, the knowledge to design effective conservation strategies, such as the distribution of mammal assemblages, is still lacking for this region. In this paper, we evaluate if assemblages of medium and large mammals (i.e., species richness, relative abundance and the contribution of the different trophic guilds) are homogeneous across the Colombian Llanos by comparing three savanna ecosystems: floodplains savannas associated with an Andean river, aeolian floodplains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical savanna; Orinoco plains; Camera trapping; Medium- and large-sized mammals; Trophic guilds.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100214

Abundance of epigaeic arthropods in a Brazilian savanna under different fire frequencies
Provedor de dados: 103
Autores: Uehara-Prado,Marcio; Bello,Ayr de M.; Fernandes,Juliana de O.; Santos,Adalberto J.; Silva,Igor A.; Cianciaruso,Marcus V.
Fire is a major determinant of structure and dynamics in savannas, and the rapid increase of human activities in this biome has changed the natural burning regime. The effects of fire on the fauna of the cerrado (Brazilian savanna) are still poorly understood, and studies comparing sites frequently and infrequently burned are scarce. In this study, the abundance of epigaeic arthropod orders and trophic guilds was assessed in cerrado sites located in the Brazilian Central Plateau that were subjected to three burning frequencies: frequent (HighFi), intermediary (MidFi), and infrequent (LowFi). In general, we found a positive relationship between the abundance of epigaeic arthropods and fire frequency. When arthropods were analyzed by orders, the abundance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachnida; Burning; Cerrado; Insecta; Trophic guilds.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500008