Limnological changes in Dom Helvécio Lake (South-East Brazil): natural and anthropogenic causes

Maia‐Barbosa, Paulina Maria; Barbosa, Luciana Gomes; Brito, Sofia Luiza; García, Francisco Debesa; Barros, Cristiane F. A.; Souza, Maria Betânia G.; Mello, Nelson Azevedo Santos Teixeira de; Guimarães, Alexandre Silva; Barbosa, Francisco A. R.

doi:10.1590/s1519-69842010000400010

Cited by 17 publications

(8 citation statements)

References 10 publications

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“…The lake complex in the Middle Rio Doce is one of the most important districts of lakes in Brazil, with approximately 130 lakes, 42 of them located inside the PERD area, which is the largest remnant of the Atlantic Forest in Minas Gerais, totaling 36,000 ha (Maia- Barbosa et al, 2010) (Fig. 1a).…”

Section: Study Areamentioning

confidence: 99%

Seasonal changes in optical properties of two contrasting tropical freshwater systems

2016

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Section: Study Areamentioning

confidence: 99%

Seasonal changes in optical properties of two contrasting tropical freshwater systems

2016

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“…Among the impacts within the park the illegal hunting and fishing, introduction of exotic species (mollusks, fishes and even a primate) and tourism on the shore grounds of Lake Dom Helvécio deserve special attention. Concerning the latter, some modifications in the species abundance and functioning were related to anthropic interferences (Maia- Barbosa et al 2010). Some examples of impacts in the vicinity of the Park, which have been cited by the authors, are the extensive Eucalyptus spp.…”

Section: Introductionmentioning

confidence: 99%

Zooplankton (Copepoda, Rotifera, Cladocera and Protozoa: Amoeba Testacea) from natural lakes of the middle Rio Doce basin, Minas Gerais, Brazil

et al. 2014

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(Copepoda, Rotifera, Cladocera and Protozoa: Amoeba Testacea) from natural lakes of the middle Rio Doce basin, Minas Gerais, Brazil.Abstract: A list of zooplankton species identified during ten years of studies in the lake system of the middle Rio Doce basin is presented. This lake system integrates the Atlantic Forest biome, a biodiversity hotspot. Three types of studies were achieved by the Brazilian Long Term Ecological Research Program (Brasil-LTER/PELD-UFMG site 4): i) a temporal study (study 1) which sampled four lakes monthly and three lakes twice a year during ten years; ii) a comparative study of limnetic and littoral species composition (study 2) and iii) a spatial study (study 3) that evaluated the species composition of eighteen lakes (eight lakes inside the Rio Doce State Park (RDSP) and ten lakes in its surrounding area) during one year with quarterly sampling. A total of 354 taxa were identified out of which 175 belong to the Rotifera, 95 to the Protozoa (Amoeba Testacea), 55 to Cladocera and 25 to Copepoda. Although many identified species where common in tropical environments, we present new records for the Middle Rio Doce basin. The group of lakes outside the RDSP showed higher exclusive species compared to lakes inside the RDSP. This pattern may be due to higher disturbance intensity and frequency to which the lakes outside RDSP are subjected, being an important factor affecting community structure. These aquatic ecosystems presents more than half of the zooplankton species registered for the Minas Gerais State and is, undoubtedly, one of the Brazil's priorities for conservation, sustaining high diversity in a very small, limited and threatened region. Resumo: Uma lista das espécies de zooplâncton identificadas durante dez anos de estudos no sistema de lagos do médio Rio Doce é apresentada. Este sistema de lagos faz parte do bioma da Mata Atlântica, um hotspot de biodiversidade. Três tipos de estudos foram conduzidos pelo Programa de Pesquisas Ecológicas de Longa Duração (PELD-UFMG site4): i) um estudo temporal, que amostrou quatro lagoas mensalmente e três lagoas semestralmente durante dez anos; ii) um estudo comparativo entre a composição de espécies da região limnética e litorânea e iii) um estudo espacial que avaliou a composição de espécies de dezoito lagoas (oito dentro dos limites do Parque Estadual do Rio Doce (PERD) e dez na sua região do entorno) durante um ano com amostragens trimestrais. Um total de 354 taxa foram identificados sendo 175 pertencentes a Rotifera, 95 a Protozoa (Amoeba Testacea), 55 a Cladocera e 25 a Copepoda. Embora muitas espécies identificadas sejam comuns a ambientes tropicais, são apresentados novos registros para a bacia do Médio Rio Doce. O grupo de lagos fora do PERD apresentou uma maior riqueza exclusiva comparado ao grupo de lagoas dentro do PERD. Este padrão pode ser devido a maiores frequência e intensidade de distúrbios aos quais as lagoas fora do PERD estão sujeitas, já que este é um fator importante que afeta a estruturação de comunidades. Este ecossi...

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“…This lake is warm monomictic, with a short circulation period (from May to August) during the dry season. It is classified as oligomesotrophic (Maia‐Barbosa et al ) with a perimeter of 37.7 km, an area of 5.3 km 2 , a volume of 5.94 × 10 7 m 3 , and a maximum and mean depth of 39.3 and 11.2 m, respectively (Bezerra‐Neto and Pinto‐Coelho ). The second is a temperate lake—Lake Mendota (43°06′N, 89°25′W)—located in an urban area of Madison, Wisconsin, and has been monitored by the North Temperate Lakes Long‐Term Ecological Research (NTL‐LTER) program since 1995.…”

Section: Materials and Proceduresmentioning

confidence: 99%

Modeling vertical gradients in water columns: A parametric autoregressive approach

Pujoni

Brighenti

Bezerra‐Neto

et al. 2019

Limnology & Ocean Methods

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Vertical gradients (e.g., water temperature and density) are a measurable expression of the potential energy of a water body, which is a fundamental driver for biogeochemical processes in aquatic ecosystems. Seasonal vertical stratification is typically described by the mixed layer and thermocline depths, and these metrics are often estimated through visual assessment of graphical plots or using numerical methods. The most widely used numerical method estimates the derivative of temperature (or density) along the depth, but it is sensitive both to profile data resolution and presence of nonconforming observations. In this study, we propose a new method of modeling vertical gradients using a four‐parameter sigmoidal function, including temporal autocorrelation. The parameters were estimated through Bayesian nonlinear regression with conditional autoregressive errors. The proposed method provides a quantitative and automated way to estimate the mixed layer and thermocline depths even for data profiles with a poor resolution. It also showed good performance against high‐frequency measurement data.

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Limnological changes in Dom Helvécio Lake (South-East Brazil): natural and anthropogenic causes

Cited by 17 publications

References 10 publications

Seasonal changes in optical properties of two contrasting tropical freshwater systems

Seasonal changes in optical properties of two contrasting tropical freshwater systems

Zooplankton (Copepoda, Rotifera, Cladocera and Protozoa: Amoeba Testacea) from natural lakes of the middle Rio Doce basin, Minas Gerais, Brazil

Modeling vertical gradients in water columns: A parametric autoregressive approach

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