Consulta: subjectFacets:"Trophic groups"
Registros recuperados: 9
Data/hora: 09/06/2024 08:45:49

Taxonomic and functional diversity of mollusk assemblages in a tropical rocky intertidal zone
Provedor de dados: 76
Autores: Souza,Shayanna M. A. da R.; Matthews-Cascon,Helena; Couto,Erminda da C. G.
ABSTRACT We investigated the spatial variation of molluscan assemblages with different habitat-forming species and bare rock habitat in a rocky intertidal zone in northeastern Brazil. The high intertidal zone substrate was covered predominantly of barnacles [Chthamalus bisinuatus (Pilsbry, 1916)], the mid-intertidal of mussels [Brachidontes exustus (Linnaeus, 1758)] and the low intertidal of macroalgae chlorophytes [Gayralia oxysperma (Kützing) K. L. Vinogradova ex Scagel et al., 1989 and Ulva lactuca Linnaeus, 1753], phaeophytes [Sargassum vulgare C. Agardh] and rhodophytes [Palisada flagellifera (J.Agardh) K. W. Nam, 2007]. A total of 3,861 mollusks were recorded, belonging to the classes Gastropoda (9 species; 3,800 individuals), Bivalvia (3 spp.; 54...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trophic groups; Benthic ecology; Ecosystem engineers; Biological substrate; Southwestern Atlantic.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100227

Difference in reproduction energy content in muscles on fish from reservoirs in Paraná State, Brazil
Provedor de dados: 83
Autores: Espínola,Luis Alberto; Dourado,Elãine Christine dos Santos; Benedito,Evanilde.
The variation in energy in the muscles of the most representative fish species from three Neotropical Reservoirs was investigated to determine the effect of the reproductive process on the amount of energy allocated and a possible relationship between the general welfare of the species and their caloric content. Significant differences were detected between the sexes and among the stages of gonad maturity. In general, the variation in energy in the muscles indicate to be a function of the reproductive cycle. In most examined species, females presented the highest caloric values, reflecting physiological differences in their use of energy, relative to the reproductive process. However, there was no significant correlation between caloric values and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calorimetry; Condition factor; Freshwater fish; Paraná River basin; Trophic groups.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000400783

Influence of hydrology on the fish body condition in a large subtropical floodplain
Provedor de dados: 83
Autores: Rabuffetti,Ana P.; Abrial,Elie; Espínola,Luis A.; Amsler,Mario L.; Eberle,Eliana G.; Blettler,Martín C. M.; Paira,Aldo R.
ABSTRACT With the objective of finding fluctuations on fish body condition in the Middle Paraná River floodplain in different hydrological scenarios, this attribute was analyzed in several trophic groups of a secondary floodplain channel and its associated lakes between 2010 and 2012. Standardized residuals generated by length-weight regressions were calculated for each species and the relative weight (Wr) of the most abundant species per group was examined. A two-way factorial ANOVA was carried out (factors: hydrology and habitats) to evaluate the existence of significant spatial-temporal differences by groups and species. Results showed that body condition in detritivorous, herbivorous and omnivorous species fluctuated significantly depending on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flood/flow pulses; Hydrological fluctuations; Ichthyofauna; Middle Paraná River; Trophic groups.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000100210

Effects of various continuous cropping times on soil nematode structure in cotton fields of Xinjiang, China
Provedor de dados: 85
Autores: Li,XL; Wang,YC; Busso,CA; Xiang,JS; Zhang,AM; Qu,YW; Liu,Y.
Long-term continuous cropping of cotton had led to substantial agricultural losses. However, continuous cotton cropping could maintain high crop yields for many years in some areas. The composition and structure of soil nematode communities were investigated to explore the effect of continuous cropping and soil depths on these communities. Soil samples were collected at two soil depths (0-20 cm and 20-40 cm) from cotton fields with a history of 5, 10, 15 or 20 years of continuous cotton cropping in the Karamay region. The results showed that 36 genera were found. Significant differences in the numbers of total nematodes and trophic groups were observed among continuous cropping times. The highest number of total nematodes was observed at 20-40 cm depth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nematode abundance; Continuous planting; Ecological indexes; Trophic groups; Soil depth.
Ano: 2016
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100006

Diet of invertebrates sampled in leaf-bags incubated in a tropical headwater stream
Provedor de dados: 103
Autores: Carvalho,Emerson M. de; Uieda,Virgínia S.
The diet of macroinvertebrates sampled in leaf-bags incubated in a tropical stream was analyzed on a spatial scale (one forested and one deforested area) and on a temporal scale (dry and rainy seasons). The macroinvertebrates were mostly represented by detritivores specialized in fine detritus (69%), followed by generalist detritivores (10% with a diet based on fine and coarse detritus), carnivores (10%), omnivores (8%), and one detritivore genera specialized on coarse detritus (3%). The detritivores exhibited a broad spatial and temporal distribution and were represented mainly by Ephemeroptera, Trichoptera and Diptera. Phylloicus sp. (Trichoptera) consumed mostly coarse detritus (CPOM) and can be classified as the unique specialist shredder in this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Detritus; Gut content; Macroinvertebrates; Trophic groups.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400014

Os grupos tróficos em Coleoptera
Provedor de dados: 104
Autores: Marinoni,Renato C.
The beetles are a useful group for studies on trophic structure of communities, mainly in forested areas. These kind of studies are based on food habits of species groups. The different terms applied to nomminated these groups (trophic category, ecologic group, trophic group, guild, trophic guild) are discussed. The term trophic group, a natural unity, is proposed to form a group of species with the same food habits, not considering the trophic level. The guild, an artificial unity, is recognized as an important tool to group organisms group that use the same resources as defined by the investigator (Hawkins &amp;amp; MacMaiion, 1989; Simberloff &amp;amp; Dayan 1991; Wilson 1999). The known alimentary habits of Coleoptera are classified in five trophic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coleoptera; Trophic groups; Guilds; Communities; Trophic structure.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000100024

Composition and structure of bird communities in vegetational gradients of Bodoquena Mountains, western Brazil
Provedor de dados: 42
Autores: GODOI,MAURICIO N.; SOUZA,FRANCO L.; LAPS,RUDI R.; RIBEIRO,DANILO B.
ABSTRACT The informations of bird species distribution in different habitats and the structure of their communities are crucial for bird conservation. We tested the differences in composition, richness and abundance of birds in different phytophysiognomies at Bodoquena Mountains, western Brazil, and we demonstrated the variations in richness and abundance of birds between different trophic groups. Sampling was conducted between July 2011 and June 2012 in 200 point counts arranged in the study area. A total of 3350 contacts were obtained belonging to 156 bird species. Woodland savannas, seasonal forests and arboreal savannas had higher bird abundance and richness, while riparian forests, clean pastures and dirty pastures had smaller values of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Habitat use; Point counts; Private Reserves; Trophic groups.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100211

Richness, composition and trophic groups of an avian community in the Pernambuco Endemism Centre, Alagoas, Brazil
Provedor de dados: 42
Autores: TOLEDO-LIMA,GUILHERME S.; MACARIO,PHOEVE; LYRA-NEVES,RACHEL M. DE; TEIXEIRA,BRUNO P.; LIMA,LUIZ A.F. DE; SUGLIANO,GABRIEL O.S.; TELINO-JÚNIOR,WALLACE R.
In northeastern Brazil, the reduction of the natural forest cover to a series of small, isolated fragments has had negative consequences for the local avian fauna, in particular, a loss of the more specialized species, while the populations of some generalists have tended to increase. The present study focuses on the composition and trophic groups of a bird community on a farm in the northeastern Brazilian state of Alagoas. Monthly surveys were conducted between November 2008 and October 2009, based on mist-netting and systematic observations. Overall, 112 species were recorded, of which 76 were associated with the two forest fragments surveyed, while all the others were observed exclusively in the surrounding matrix of pasture and orchards. The bird...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Birds; Northeastern Brazil; Trophic groups.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301207

SPATIAL AND TEMPORAL CHARACTERIZATION OF SOFT BOTTOM POLYCHAETES IN A SHALLOW TROPICAL BAY (COLOMBIAN CARIBBEAN)
Provedor de dados: 50
Autores: Guzmán-Alvis,Angela I.; Lattig,Patricia; Ruiz,José A.
The spatial and temporal variations of the polychaete assemblages were studied within and off a shallow (10-25 m) tropical bay (Bahía de Portete). The polychaete abundances at family level and their trophic mechanisms were used for this purpose. Sediment samples were collected at six stations in this bay during the wet and dry seasons. Multivariate analysis indicated that off- Bay polychaete assemblages were different from the bay ones; this spatial variation was related to sedimentary characteristics, depth and turbid-water conditions. On the other hand, these assemblages did not show significant differences between the dry and wet seasons. The differences between these two assemblages were given specially by the Syllidae, Gonidadidae, Nephtyidae,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropic; Polychaetes; Trophic groups; Taxonomic structure; Bahía de Portete.
Ano: 2006
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612006000100002