Consulta: subjectFacets:"Aquatic invertebrates"
Registros recuperados: 7
Data/hora: 10/06/2024 08:22:41

Assessment of ecological risk to populations of aquatic invertebrates
Provedor de dados: 13
Autores: Tsytsugina, V. G.
On the base of experimental data and cytogenetic studies of marine and freshwater invertebrates natural populations it was shown that different species had approximately equal part (%) of full value posterity at the same average level of chromosome mutagenesis for populations, independing on deleterious factors and females fecundity. This phenomenon made it possible to calculate specimens reproductive contribution for species with different females fecundity and to assess expected reduction of population adaptive potential and the increase of ecological risk at different levels of population damage. It is suggested that the adaptation to pollution will be more effective in populations with high female fecundity.
Tipo: Journal Contribution
Palavras-chave: Aquatic invertebrates; Pollution; Fecundity; Adaptation; Ecological risk assessment; Водные беспозвоночные; Загрязнение; Плодовитость; Адаптация; Оценка экологического риска.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/1085

Can nesting waterbirds influence the community structure of macroinvertebrates in southern Brazilian intermittent wetlands?
Provedor de dados: 76
Autores: Zardo,Daniela C.; Souza,Marcela M.; Pires,Mateus M.; Stenert,Cristina; Maltchik,Leonardo.
ABSTRACT The main goal of this study was to test the effect of the presence of nesting waterbirds on the taxonomic structure (richness, abundance and composition) of macroinvertebrate communities in southern Brazilian wetlands. Macroinvertebrate communities were seasonally sampled in eight intermittent wetlands differing according to the occurrence of nesting colonies of waterbirds (four with the presence of rookeries; four without). The influence of nutrients and water and sediment physicochemical variables on macroinvertebrate communities was also assessed. The community structure of aquatic macroinvertebrates was not affected by the presence of colonies of nesting waterbirds. Rather, macroinvertebrate communities varied seasonally and they were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic invertebrates; Ponds; Waterfowl; Water chemistry.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100219

Assemblage of immature Odonata (Insecta, Anisoptera) in streams of the Mato Grosso do Sul State: spatial implications
Provedor de dados: 76
Autores: Soares,Juliane A. C.; Batista-Silva,Valéria F.; Boneto,Daiane D.; Bailly,Dayani; Abelha,Milza C. F.; Oliveira,Iana A. D. V. de.
ABSTRACT This study investigated the assemblages attributes (composition, abundance, richness, diversity and evenness) and the most representative genera of Odonata, Anisoptera at Água Boa and Perobão Streams, Iguatemi River basin, Brazil. Both are first order streams with similar length that are impacted by riparian forest removal and silting. Quarterly samplings were conducted from March to December 2008 in the upper, intermediate and lower stretch of each stream. The Mantel test was used to check the influence of spatial autocorrelation on the Odonata composition. Spatial variations in the composition were summarized by the Principal Coordinates Analysis (PCoA) using Mantel test residuals. The effects of spatial correlation on richness and abundance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic invertebrates; Iguatemi River basin; Lotic environments; Odonatofauna.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000300325

Critical Review: Essential fatty acids on shrimp feeding
Provedor de dados: 22
Autores: Lima, Rodrigo Barbosa; Figueiredo-Lima, Denise Fontana.
Four types of poly unsaturated fatty acids (PUFA) are essential for all shrimp species, linoleic (LOA, 18:2n-6), alfa-linolenic (ALA, 18:3n-3), eicosapentaenoic (EPA, 20:5n-3) and docosahexaenoic (DHA, 22:6n-3) acids. Moreover, the arachidonic acid (ARA, 20:4n-6), even when present, seems to be, in crustaceans, not so important or yet dispensable. It is relevant knowing that cholesterol as much as PUFA are not well absorbed when not followed by a substantial amount of lecithin, reaching 5% of the ration. The sum of PUFA reaches around 3% of the diet, even varying according to the species, stage and ration type. For Penaeus monodon, a complex mathematic model was formulated in order to describe the relationships between the requirements of the cited PUFA....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipids; Fatty acids; Aquatic invertebrates; Nutritional requirements.
Ano: 2016
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/14000

The benthic macroinvertebrate fauna of highland streams in southern Brazil: composition, diversity and structure
Provedor de dados: 104
Autores: Buckup,Ludwig; Bueno,Alessandra A. P.; Bond-Buckup,Georgina; Casagrande,Marcelo; Majolo,Fabiane.
Benthic macroinvertebrate in four rivers, three in the Pelotas River basin (Divisa, Marco and Silveira rivers, in the headwaters of the Uruguai River) and one in the Taquari-Antas system (Antas River), a tributary in the Guaíba basin, in the state of Rio Grande do Sul, were identified. Two samples were collected in summer, autumn and spring, with one replicate in each river. The total of 28,961 specimens included members of Platyhelminthes, Annelida, Acarina, Insecta, Crustacea and Mollusca. The Silveira and Marco rivers showed significant differences in the indices of Shannon-Weaver (H’), Simpson’s Reciprocal (1/D), Margalef (DMg) and Equitability (E). The Silveira River showed the highest means of diversity and the EPT index (Ephemeroptera, Plecoptera,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic invertebrates; Community structure; Diversity indices; Rio Grande do Sul.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000200005

Richness and density of aquatic benthic macroinvertebrates after exposure to fungicides and insecticides in rice paddy fields
Provedor de dados: 42
Autores: WANDSCHEER,ALANA C.D.; MARCHESAN,ENIO; SANTOS,SANDRO; ZANELLA,RENATO; SILVA,MARÍLIA F.; LONDERO,GUILHERME P.; DONATO,GABRIEL.
ABSTRACT The objective of this study was to verify the richness and density of aquatic benthic macroinvertebrates after exposure to fungicides and insecticides of the rice paddy fields. In the crop seasons of 2012/13 and 2013/14, field experiments were performed, which consisted of single-dose applications of the fungicides trifloxystrobin + tebuconazole and tricyclazole, and the insecticides lambda-cyhalothrin + thiamethoxam and diflubenzuron, in 10 m2 experimental plots, over rice plants in the R3 stage. Control plots with and without rice plants were maintained in order to simulate a natural environment. Soil samples were collected during rice cultivation for assessment of the macroinvertebrate fauna. Chemical-physical parameters assessed in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic invertebrates; Lowlands; Oryza sativa L.; Pesticides.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100355

Environmental diagnosis of metals in streams near sugarcane cultivation areas: current and historical analysis in the central region of the State of São Paulo
Provedor de dados: 42
Autores: CORBI,JULIANO J.; COSTA,CAMILA G.; GORNI,GUILHERME R.; COLOMBO,VANESSA; RIOS,LEONARDO.
Abstract In Brazil, innumerable regions of native landcover have been removed and replaced by agricultural cultivation, especially of sugarcane. In this culture, the application of fertilizers containing metals has caused impacts on the water resources causing contamination of stream sediments and occasioning bioaccumulation of metals in aquatic invertebrates. In the year of 2006, an environmental diagnosis of metals in sediments of streams located near sugarcane cultivation areas and in streams located in preserved areas, was published. That study pointed to high concentrations of metals in stream sediments in agricultural areas. These streams have been monitored over the last 10 years conducting analyses of metals and monitoring possible changes in land...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic biota; Aquatic invertebrates; Fertilizers; Riparian vegetation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602711