Sheila Cardodo Silva

• Doctor of Ecology
• Professor at Federal University of Alfenas

The existing literature provides limited insights into the dynamics of phytoplankton communities and the spatial heterogeneity of physicochemical parameters in multisystem cascade reservoirs (interconnected reservoirs derived from different rivers). The existing studies are concentrated on cascade reservoirs (interconnected reservoirs derived from...

Environmental reference conditions (RC) and historical trends are crucial for assessing the degree of freshwater impact and formulating restoration measures. This is particularly relevant for freshwater systems used as potable water sources. Using sediments from the Carlos Maggiolo reservoir (Minas, Uruguay), located in a watershed with a mining hi...

Studies on functional traits of aquatic communities are useful for understanding the ecosystem dynamics as well as the diversity of ecological niches. Here, we characterize zooplankton functional groups and which limnological factors are responsible to changes in traits. Water samples were collected to evaluate limnological parameters and vertical...

RESUMO Estudos que a avaliem a heterogeneidade espacial e temporal em reservatórios podem servir como subsídio à implementação de políticas públicas, além de auxiliar tomadores de decisão e pesquisadores. O objetivo deste trabalho foi determinar a heterogeneidade temporal e espacial geoquímica de sedimentos do reservatório Pedro Beicht (Cotia, São...

Para se estabelecer o nível de impacto em relação à concentração de metais no sedimento é preciso que se conheça os valores naturais ou valor de referência com os quais podemos comparar o estado prístino e atual de um ecossistema. Existem diferentes métodos para avaliar os valores basais de concentrações de metais como o uso de dados históricos ou...

A análise do sedimento oferece uma visão tangível dos eventos que acontecem dentro de uma bacia ou área de drenagem, desvendando fontes potenciais para a acumulação de elementos nestes ambientes. Esta pesquisa apresenta um estudo de caso que faz uso de uma abordagem geoestatística para melhor compreender a distribuição espacial dos teores de Al, Ba...

The historical impacts of eutrophication processes were investigated in six subtropical reservoirs (São Paulo, Brazil) using a paleolimnological approach. We questioned whether the levels of pigment indicators of algal biomass could provide information about trophic increase and whether carotenoid pigments could offer additional insights. The follo...

All changes taking place in a watershed have repercussions on lacustrine environments, being these, the sink of all activities occurring in the basin. Lake Titicaca, the world’s highest and navigable lake, is not unfamiliar with these phenomena that can alter the sedimentation dynamics and metal accumulation. This study aimed to identify temporal t...

Continental shelves hold ecological, environmental and economic importance. Mud depocenters found on continent shelves are able to adsorb and incorporate organic and inorganic pollutants into the surface of their grains, creating an effective record of anthropogenic influence and environmental changes in a region. The aim of this study is to perfor...

Spatial distribution and interpolation methods provide a summarized overview about the pollution dispersion, concerning the environment's quality. A high-altitude lake was taken as a model to assess the metalloid As and metals Cr, Cu, Ni, Pb, Zn distribution in superficial sediment and classify them according to their ecotoxicological potential in...

Diferentes abordagens têm sido dadas aos estudos que buscam compreender os reais impactos da presença de microplásticos em ecossistemas aquáticos de água doce. Dentre elas, há estudos que avaliam os efeitos combinados entre microplásticos e outros poluentes presentes no ambiente aquático. Isto se dá devido a capacidade de partículas plásticas adsor...

Spatial distribution linked to geostatistical techniques contributes to sum up information into an easier-to-comprehend knowledge. This study compares copper spatial distribution in surface sediments and subsequent categorization according to its toxicological potential in two reservoirs, Rio Grande (RG) and Itupararanga (ITU) (São Paulo—Brazil), w...

Rivers in the Amazon have among the greatest biodiversity in the world. The Xingu River, one of the tributaries of the Amazon River, has a length of 1640 km, draining 510,000 km2 in one of the most protected regions on the planet. The Middle Xingu region in Brazil has been highly impacted by mining and livestock farming, leading to habitat fragment...

Sediment cores were used to establish past environmental impacts associated with eutrophication, erosion and metal contamination in the subtropical Atibainha reservoir (São Paulo State, Brazil). We hypothesize that: (1) the levels of nutrients, determined by a spectrophotometric method, reflect the contributions of these elements over time and (2)...

to the water column at Core 5, by the mineralisation of OM by oxic pathways and retained at Core 2. Although Core 4 had high P concentration on PW, no results of flux was possible due to lack on bottom water data. No concentration of SRP was detected in PW of Core 1 and 7. Release of Fe, Mn, Zn and Cr was also observed. SRP was absent at the most e...

TC), organic matter by loss on ignition (OM), total sulphur (TS), and major ions and metals (Ca 2+ , Mg 2+ , Na + , K + , NH 4 + , SO 4 2− , Cl − , NO 3 − , As, Al, Ba, Cr, Cu, Fe, Mn, Ni and Zn). Our fingerprinting approach helped to outline horizontal spatial heterogeneities (categorised as riverine, transitional and lacustrine areas) that were a...

O método Fingerprinting é utilizado para auxiliar na distinção de fontes de contaminação em ecossistemas aquáticos, correlacionando os compartimentos ambientais, como, solo e material particulado, solo e sedimento, entre outros. Devido à alta diversidade de atividades no entorno de ecossistemas aquáticos, cada vez torna-se mais dificultosa a tarefa...

Aim This research evaluated the water quality of the Taquacetuba Compartment, Billings Reservoir (Brazil), through analyzes of water quality data. The Taquacetuba Compartment has multiple uses such as public water supply and professional fishing activity and is of fundamental importance for the population of São Paulo State. Methods Sampling were c...

RESUMO No Brasil os principais focos de contaminação por mercúrio estão localizados na região Norte do país. Atividades como a mineração de ouro, o desmatamento e a queimada das florestas Amazônicas são as principais fontes antrópicas deste elemento aos ecossistemas aquáticos. Neste trabalho efetuamos uma revisão da literatura sobre o Hg em ecossis...

Os metais de origem geogênica ou antrópica, podem ser incorporados pela biota, porém, grande parte tende a sedimentar permanecendo retidos no sedimento. De modo geral, as pesquisas que avaliam os metais no sedimento, quase sempre o fazem de forma pontual e são relativamente poucos os trabalhos que mostram a distribuição espacial das concentrações d...

The research describes the total arsenic spatial distribution in Puno Bay, Lake Titicaca, Peru.

Lake Titicaca is one of the major lakes in South America and It is the highest navigable lake in the world. This antique lake has suffered many changes, mainly, related to its depth duting 1.6 million years. The lake reached 3950m asl (above sea level) and now it has a mean of 3810m (Hutchinson et al. 1976; Fornace et al. 2014). The lake has an are...

Paleolimnological research can shed light on a broad range of environmental concerns; however, such studies are scarce in reservoirs. To address this lack of knowledge, a paleolimnological investigation was conducted to determine historical changes in sedimentation rates (SR), using 210 Pb geochronology, and concentrations of nutrients and metals (...

Aim: This study aimed to evaluate land use, distribution of particle size fractions, organic matter (OM) and perform a metal quantification liable to complexation in the Itupararanga Reservoir (São Paulo, Brazil). This aquatic ecosystem is used for water supply and energy generation and is constantly subjected to anthropogenic impacts that alter it...

Metals are important recognized for their potentially toxic character to communities, in addition to being bioaccumulative in some organisms. In this work, the concentrations of cadmium, chromium, copper, lead, mercury, and zinc in sediments from three sampling points in the Billings, Guarapiranga, and Rio Grande reservoirs (São Paulo, Brazil) betw...

Global change drivers including eutrophication, hydrological disturbance, climate change, chemical pollution, overexploitation, invasive species, and land-use change are affecting the function and structure of freshwater ecosystems. South American freshwater ecosystems are especially threatened by the combination of rising human pressures on natura...

The establishment of reference conditions and typology are two important steps in water resources management. The reference conditions enable the determination of how impacted an ecosystem is, while the typology facilitates the implementation of management procedures. A study of subtropical reservoirs in São Paulo State (Brazil) was performed to ob...

Wastewater discharges from dairy industries can cause a range of harmful effects in aquatic ecosystems, including a decline in biodiversity due to species evasion. Therefore, it is important to know the purification potential of rivers for the removal of pollutants released in dairy wastewater (DWW). The hypothesis adopted in this work was that the...

Many studies have found evidence of processes of eutrophication and contamination by metals in reservoirs worldwide. The present work discusses the history of changes associated with anthropic impacts in a tropical reservoir (São Paulo, Brazil), using the analysis of metals, nutrients, and pigments in sediment cores. Three cores were obtained in th...

RESUMO O objetivo deste estudo consiste na avaliação da eficácia do uso de um índice de estado trófico (IET) como ferramenta na análise da qualidade das águas de três reservatórios. O IET foi calculado baseado na transparência do reservatório e nas concentrações de clorofila-a e fósforo total (P total). Para identificar a correlação do uso do solo...

The impacts of anthropic activities have had profound effects on the nitrogen (N) and phosphorus (P) cycles in many aquatic ecosystems. We investigated the spatial and temporal distributions of carbon (C), N, and P in the sediments of a tropical Paiva Castro Reservoir (São Paulo, Brazil), as well as their release and retention in the system. In 201...

An increasing number of studies have shown the ability of organisms to escape from toxic effects due to contamination, by moving spatially towards less contaminated habitats. However, this issue has been investigated in monospecific scenarios, without considering possible interactions between species during the contamination avoidance process. It i...

El hombre ha cambiado el ambiente para sostener la demanda global de recursos naturales como el agua. La gestión de los cuerpos hídricos tiene que ser constante, con el propósito preventivo y correctivo, dependiendo del estado de antropización de cada sistema. El objetivo de este artículo fue analizar la toxicidad del sedimento y los metales Mn, Zn...

Depending on the environmental conditions, surface sediments can retain all the contaminants present and provide a record of the anthropic activities affecting the aquatic environment. In order to analyze the impacts on reservoirs, surface sediments were collected in three characteristic regions (riverine, transitional, and limnetic zones) of seven...

Reservoirs in urban areas are used for different purposes and are liable to different types of pressures that can cause the loss of chemical and biological quality, hence diminishing their ecological, economic, and cultural benefits. Here, a study of surface water heterogeneity was undertaken at the Guarapiranga urban reservoir (São Paulo, Brazil)...

Cascade multisystem reservoirs are extremely complex ecosystems that require studies to improve understanding of their dynamics and functioning, including the effects of contamination with metals. In this work, superficial sediments were collected during two sampling campaigns (in the dry and rainy seasons) at 19 sites along a cascade multisystem r...

The aim of this research was to analyze the horizontal spatial heterogeneity of both water and superficial sediment quality among and within the reservoirs of the Cantareira System (CS), focusing on concentrations of N and P, attributed to the dumping of raw domestic sewage into water bodies, which is the main cause of water pollution in São Paulo...

Sediments may be a repository of contaminants in freshwater ecosystems. One way to assess the quality of this compartment, in terms of potentially bioavailable metals, is by the analysis of acid-volatile sulfide (AVS) and simultaneously extracted metals (SEM). In order to investigate the bioavailability, toxicity, and compartmentalization of differ...

RESUMO Este artigo apresenta o projeto " Observando o Rio Sorocaba: União Pró-Tietê " , cujo objetivo é o monitoramento da qualidade da água do Rio Sorocaba e o despertar de sensibilizações em alunos do ensino fundamental de escolas públicas do município de Sorocaba, por meio de aulas sobre Educação Ambiental (EA). O monitoramento contou com 113 co...

The analysis of heavy metals in sediments, associated with geochronology, can identify the historical accumulation of these contaminants that occurred over time as a result of anthropogenic activities. A study was conducted at Paiva Castro Reservoir, a tropical reservoir in Brazil, to (1) establish baseline values for the metals Cd, Cr, Cu, Ni, Pb,...

Dentre as diversas atividades desenvolvidas no entorno de corpos de água, a poluição por agroquímicos e o lançamento de efluentes acarretam a carga excessiva de nutrientes que contribuem para o processo de eutrofização artificial e degradação destes ecossistemas. Neste contexto, os objetivos deste trabalho foram: determinar a heterogeneidade sazona...

The Metropolitan Region of São Paulo (MRSP) is located in the Brazilian State of São Paulo and reservoirs in this region are vital for water supply and energy production. Changes in economic, social, and demographic trends produced pollution of water bodies, decreasing water quality for human uses and affecting freshwater populations. The presence...

RESUMO A determinação dos padrões de heterogeneidade espacial horizontal de reservatórios auxilia na elaboração de propostas de manejo e gerenciamento das bacias. O Sistema Cantareira abastece em torno de 55% da região metropolitana de São Paulo, é constituído de cinco reservatórios interligados, e vem sofrendo inúmeros impactos ao longo dos anos,...

In Brazil, although the local water resource management (WRM) system has shown progress, many improvements are still required. The Water Framework Directive (WFD), the European WRM model, recognizes that the ecological quality of ecosystems is the most effective way to ensure sufficient availability of water in adequate quality standards. In this p...

INTRODUÇÃO Na disputa por recursos, os organismos podem apresentar comportamentos agonísticos que aumentem sua chance de vitória (Krebs & Davies 1996). Dependendo da disponibilidade e valor do recurso, essas disputas poderão ter diferentes intensidades e durações (Krebs & Davies 1996). Em muitas espécies a condição física e o tamanho corporal dos i...

INTRODUÇÃO Em comunidades arbóreas, as diferentes formas de alocação de recursos para o crescimento são evidenciadas quando comparamos espécies de subdossel e emergentes (Harper 1990). No subdossel, as árvores são mais baixas em relação às árvores de dossel e, por estarem sombreadas, tendem a investir mais recursos em área foliar e/ ou número de fo...

1 Universidade de São Paulo-Instituto de Biociências/ 2 Unesp-Sorocaba sheilacardoso@usp.br INTRODUÇÃO A crescente degradação da qualidade da água, tanto em países desenvolvidos quanto em países em desenvolvimento, tem elevado os custos de tratamento e encarecido a produção de água potável (Tundisi, 2003). O Brasil apresenta sérios problemas relaci...

INTRODUÇÃO A distribuição dos organismos no ambiente é influenciada por fatores biológicos e físicos (Krebs 1994). Entre os fatores biológicos estão a competição, a predação e a herbivoria, que podem interferir na disponibilidade de recursos alimentares, sobrevivência e reprodução dos indivíduos (Nybakken 1993). Por outro lado, fatores físicos como...

INTRODUÇÃO O costão rochoso é um ambiente de transição entre o ambiente marinho e o terrestre (Levinton 1995). Este ecossistema tem um gradiente de características marinhas e terrestres que influenciam a distribuição de espécies, e promovem a formação de três faixas horizontais, o que é conhecido como zonação (Tait 1972). A distribuição vertical do...

INTRODUÇÃO O conjunto de espécies que compõe uma comunidade varia no tempo e no espaço, sendo determinado por processos ecológicos e evolutivos (Ricklefs 1993). Esses processos são responsáveis pelo modo como as diferentes formas de vida irão se estabelecer em uma dada área segundo as condições ambientais e os recursos presentes no meio. Para perma...