Effects of pollution on dormant-stage banks of cladocerans and rotifers in a large tropical reservoir.

Here, we describe the abundance and composition of the dormant-stage banks of cladocerans and rotifers at two locations in a tropical reservoir (Furnas Reservoir, Minas Gerais, Brazil) that are subject to different anthropogenic impacts. We hypothesized that at the site that received sewage, the density of resting eggs would be higher, but the species richness would be lower. Sediment samples were collected monthly at the two sampling stations.

Land use dynamics and future scenarios of the Rio Doce State Park buffer zone, Minas Gerais, Brazil.

It is necessary to understand the importance of landscapes that comprise the environment across a broad range of time and space and that each part of these landscapes responds to changes in environmental factors and land use. This study employs a multiscale modeling approach in the Rio Doce State Park (PERD), located in Minas Gerais, Brazil, based on a previous study on land use change in this region over the last 30 years (1985-2015), with an aim of predicting possible scenarios for the next 15 years (2015-2030). The results indicate that the municipalities and buffer zones within the PERD will suffer from increased human disturbance in all four land use types present in the region (Urban, Agriculture, Pasture, and Forestry).

High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics.

Temperature and light are acknowledged as important factors for hatching of resting eggs. The knowledge of how they affect hatching rates of this type of egg is important for the comprehension of the consequences of warming waters in recolonization of aquatic ecosystems dependent on dormant populations. This study aimed at comparing the influence of different temperature and light conditions on hatching rates of Daphnia ambigua andDaphnia laevis resting eggs from tropical environments.