Diversidade de habitats físicos e sua relação com macroinvertebrados bentônicos em reservatórios urbanos em Minas Gerais

Molozzi, Joseline; França, Juliana; Araujo, Thiago L. A.; Viana, Tales Heliodoro; Hughes, Robert M.; Callisto, Marcos

doi:10.1590/s0073-47212011000200006

Cited by 21 publications

(16 citation statements)

References 24 publications

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“…The US Environmental Protection Agency (EPA) Environmental Monitoring and Assessment Program (EMAP) piloted that approach in its 1992-1994 Northeastern Lake Survey (EMAP-NE). Since then, many elements of the EMAP approach for evaluating lake physical habitat structure were adapted for monitoring by the European Union's Water Framework Directive (Rowan et al 2006) and also were applied in a multi-year study of Brazilian reservoirs (Molozzi et al 2011, Macedo et al 2012. The EPA modified the EMAP methods for use in its 2007 National Lakes Assessment (NLA; USEPA 2007, Kaufmann et al 2014a, 2014b; however, the biological relevance of the EPA habitat assessment approach has not been formally evaluated.…”

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Relevance of lake physical habitat indices to fish and riparian birds

Kaufmann

Hughes

Whittier

et al. 2014

Lake and Reservoir Management

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Kaufmann PR, Hughes RM, Whittier TR, Bryce SA, Paulsen SG. 2014. Relevance of lake physical habitat indices to fish and riparian birds. Lake Reserv Manage. 30:177-191.Despite the historical focus on water quality, it is becoming increasingly evident that physical habitat conditions also significantly affect lake biota. We examined associations between fish and bird assemblages and lake physical habitat based on relatively rapid assessments of Northeast US lakes. Richness of intolerant fish species declined, and that of tolerant fish species increased across regional gradients of increasing shoreline human development and decreasing abundance and structural complexity of riparian vegetation and littoral cover. Breeding bird assemblages observed in the nearshore littoral and riparian area of these lakes were similarly affected by disturbance and habitat simplification. The percentage of native neotropical migrant birds declined, and the percent of tolerant bird species increased across the same gradients. We conclude that our relatively rapid physical habitat assessments produce biologically relevant metrics useful for evaluating lake physical habitat condition and potential impacts on lake biota in regional and national lake assessments.

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confidence: 99%

Relevance of lake physical habitat indices to fish and riparian birds

Kaufmann

Hughes

Whittier

et al. 2014

Lake and Reservoir Management

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“…However, when the organic pollution is high, the benthic biodiversity decreases, leaving only the organisms tolerant to low concentration of dissolved oxygen in water. Molozzi et al (2011) observed higher taxonomic richness at the least impacted reservoir, where Chaoboridae (Diptera) represented the most abundant taxon. On the other hand, at the most impacted reservoir (urban impacts) the dominance was of Melanoides tuberculatus (Gastropoda: Thiaridae).…”

Section: Discussionmentioning

confidence: 91%

Assessment of benthic macroinvertebrates at Nile tilapia production using artificial substrate samplers

et al. 2016

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Biomonitoring is a cheap and effective tool for evaluation of water quality, and infer on the balance of aquatic ecosystems. The benthic macroinvertebrates are bioindicators sensitive to environmental changes, and can assist in detecting and preventing impacts such as organic enrichment and imbalance in the food chain. We compared the structure of benthic communities on artificial substrate samplers located in places near and far from net cages for production of Nile tilapia (Oreochromis niloticus). Samplers were manufactured with nylon net, using substrates such as crushed stone, gravel, loofah and cattail leaves. Samples were collected after 30 days of colonization, rinsed and then the specimens were identified and quantified. The following metrics were calculated: richness of Operational Taxonomic Units, Margalef richness, abundance of individuals, Shannon index and evenness index. The macrobenthic community structure was strongly modified according to the proximity of the net cages. Metrics showed significant differences (p < 0.05) between near and distant sites, for both periods (dry and rainy seasons). The position of the samplers significantly affected the structure of macroinvertebrate community, as near sites showed higher values for the community metrics, such as richness and diversity. Near sites presented a larger number of individuals, observed both in the dry and rainy seasons, with a predominance of Chironomidae (Diptera) in the dry season and Tubificidae (Oligochaeta) in the rainy season.Keywords: biomonitoring, aquaculture, Oreochromis niloticus, Brazil, artificial substrate sampler. Avaliação da comunidade de macroinvertebrados bentônicos em produção detilápia-do-Nilo com uso de coletores com substrato artificial ResumoO biomonitoramento é uma ferramenta com custo relativamente baixo e eficaz para avaliação da qualidade da água, além de inferir sobre o equilíbrio dos ecossistemas aquáticos. Os macroinvertebrados bentônicos são bioindicadores sensíveis às mudanças ambientais, e podem auxiliar na detecção e prevenção de impactos como o enriquecimento orgânico e o desequilíbrio da cadeia alimentar. Como objetivo, foi comparada a estrutura das comunidades bentônicas em coletores com substrato artificial situados em locais próximos e distantes de tanques rede para produção de tilápia do Nilo (Oreochromis niloticus). Os coletores foram fabricados com rede de náilon, utilizando os substratos brita, cascalho, bucha vegetal e folhas de taboa. Foram realizadas coletas após 30 dias de colonização. As amostras foram lavadas e os espécimes identificados e quantificados. As métricas calculadas foram: riqueza de Unidades Taxonômicas Operacionais, riqueza de Margalef, abundância de indivíduos, índice de Shannon e índice de Pielou. A estrutura da comunidade macrobentônica foi fortemente modificada de acordo com a proximidade dos tanques-rede. As métricas apresentaram diferenças significativas (p < 0,05) entre os locais próximos e distantes, em ambos os períodos (estações seca e chuvosa). A posição dos a...

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“…Nonetheless, other systems report other types of chironomids and consequently different larger morphotypes, such as Cryptochironomus, Axarus and Alotanypus (e.g. Stenert et al 2012, Floss et al 2012, Molozzi et al 2011. Thus, even though the technique used in this study is of general application, it is important to perform pilot studies before the actual sampling and subsampling in order to understand the composition of the chironomid fauna and adjust the cut off value between large and small morphotypes in accordance with the local fauna.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the error associated with the subsampling of Chironomidae in an intermittent stream of semi-arid Brazil

et al. 2015

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Analysis of the error associated with the subsampling of Chironomidae in an intermittent stream of semi-arid Brazil. Biota Neotropica.http://dx.doi.org/10.1590/1676-06032015003914Abstract: Chironomidae is a common family in freshwaters, often occurring at high densities, which hinders the processing of large samples, given that time and labor are usually limited. The present study aims at evaluating the extent of the error related with the subsampling of Chironomidae from a larger sample with regard to the size of the individuals between a sample and the subsample. A total of 9195 chironomids were collected from three sites in an intermittent stream. Samples were taken using a Dshaped net (250 mm) on eight occasions. Individuals from each sample were homogenized in a gridded Petri dish and coordinates from lines and columns were randomly drawn. Individuals from the assigned coordinates were selected until 100 individuals or 10% of the sample were chosen. Comparisons were made between the proportion of larger ( §5mm) and smaller individuals (,5mm) between the samples and subsamples, and it was established the correlation between the size of the error and the size of the sample, using the rank coefficient of Spearman. The highest error observed was 12.7%, meaning that the difference in larger individuals between the sample and subsample reached that value. However on six of the eight samples the error was below 3%. Spearman correlation showed no significance between the error observed and the size of the sample (r=0.38, p=0.35), meaning that larger samples will not yield larger error associated with the size of the individuals. The present study indicates that the subsampling technique used is capable of drawing a random subset of individuals from a sample of chironomids with regard to their size. This technique can be used in ecological or biomonitoring studies in order to reduce sample processing time without creating a bias in the analysis. Keywords: temporary pools, sampling effort, aquatic insects.

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Diversidade de habitats físicos e sua relação com macroinvertebrados bentônicos em reservatórios urbanos em Minas Gerais

Cited by 21 publications

References 24 publications

Relevance of lake physical habitat indices to fish and riparian birds

Relevance of lake physical habitat indices to fish and riparian birds

Assessment of benthic macroinvertebrates at Nile tilapia production using artificial substrate samplers

Analysis of the error associated with the subsampling of Chironomidae in an intermittent stream of semi-arid Brazil

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