Interactive effects of environmental variability and human impacts on the long-term dynamics of an Amazonian floodplain lake and a South Atlantic coastal lagoon

Bozelli, Reinaldo Luiz; Caliman, Adriano; Guariento, Rafael Dettogni; Carneiro, Luciana S.; Santangelo, Jayme M.; Figueiredo‐Barros, Marcos Paulo; Leal, João José Fonseca; Rocha, Adriana Marques; Quesado, Letícia Barbosa; Lopes, Paloma M.; Farjalla, Vinicius F.; Marinho, Cláudio Cardoso; Roland, Fábio; Esteves, Francisco A.

doi:10.1016/j.limno.2009.06.004

Cited by 37 publications

(35 citation statements)

References 46 publications

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“…In both twoand three-cluster systems, the temporal variations from river water quality data from Lake Taihu were determined by both hydrological condition (i.e., wet or dry season) and water pollution characteristics (Figure 2b). For example, NH 4 + -N in the first period (May to November) was much higher than the other clusters (Figure 2c), due to the greater contribution of agricultural runoff in the wet season. However, the mean concentrations of BOD 5 and COD Mn in the first period were close to the other two periods (Figure 2c), because the relatively larger amount of domestic sewage was offset by the greater streamflow in the rivers.…”

Section: Temporal Similarity and Variationmentioning

confidence: 87%

“…Accompanying the rapid growth of human population and industries, lake water is being heavily polluted from various sources, like domestic sewage, industrial wastewater, stormwater, agricultural runoff and atmospheric depositions [1][2][3][4]. Rivers, the natural pathways upstream of lakes, deliver most of the pollutant loadings into lakes [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Spatio-Temporal Patterns and Source Identification of Water Pollution in Lake Taihu (China)

Chen

Zhao

et al. 2016

Water

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Abstract:Various multivariate methods were used to analyze datasets of river water quality for 11 variables measured at 20 different sites surrounding Lake Taihu from 2006 to 2010 (13,200 observations), to determine temporal and spatial variations in river water quality and to identify potential pollution sources. Hierarchical cluster analysis (CA) grouped the 12 months into two periods (May to November, December to the next April) and the 20 sampling sites into two groups (A and B) based on similarities in river water quality characteristics. Discriminant analysis (DA) was important in data reduction because it used only three variables (water temperature, dissolved oxygen (DO) and five-day biochemical oxygen demand (BOD 5 )) to correctly assign about 94% of the cases and five variables (petroleum, volatile phenol, dissolved oxygen, ammonium nitrogen and total phosphorus) to correctly assign >88.6% of the cases. In addition, principal component analysis (PCA) identified four potential pollution sources for Clusters A and B: industrial source (chemical-related, petroleum-related or N-related), domestic source, combination of point and non-point sources and natural source. The Cluster A area received more industrial and domestic pollution-related agricultural runoff, whereas Cluster B was mainly influenced by the combination of point and non-point sources. The results imply that comprehensive analysis by using multiple methods could be more effective for facilitating effective management for the Lake Taihu Watershed in the future.

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Section: Temporal Similarity and Variationmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Patterns and Source Identification of Water Pollution in Lake Taihu (China)

Chen

Zhao

et al. 2016

Water

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“…On the other hand, variations in the salinity are strongly related to freshwater inputs from their catchment area in the orthogonally-oriented lagoons. Temporal coherence in the salinity among coastal lagoons has important ecological consequences regarding our ability to predict how future scenarios of rising sea levels that have originated from climate change might affect broad-scale salinisation patterns of coastal inland aquatic systems, a phenomenon that purportedly has pronounced effects on the community structure and functioning of resident biota of the coastal lagoons (Caliman et al, 2007;Santangelo et al, 2007;Bozelli et al, 2009;Laque et al, 2010). Despite the considerations mentioned above, the salinity coherence was somewhat low, with more than half of the total number of correlations showing non-significant results.…”

Section: Discussionmentioning

confidence: 99%

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

et al. 2010

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Temporal coherence (i.e., the degree of synchronicity of a given variable among ecological units within a predefined space) has been shown for several limnological features among temperate lakes, allowing predictions about the structure and function of ecosystems. However, there is little evidence of temporal coherence among tropical aquatic systems, where the climatic variability among seasons is less pronounced. Here, we used data from long-term monitoring of physical, chemical and biological variables to test the degree of temporal coherence among 18 tropical coastal lagoons. The water temperature and chlorophyll-a concentration had the highest and lowest temporal coherence among the lagoons, respectively, whereas the salinity and water colour had intermediate temporal coherence. The regional climactic factors were the main factors responsible for the coherence patterns in the water temperature and water colour, whereas the landscape position and morphometric characteristics explained much of the variation of the salinity and water colour among the lagoons. These results indicate that both local (lagoon morphometry) and regional (precipitation, air temperature) factors regulate the physical and chemical conditions of coastal lagoons by adjusting the terrestrial and marine subsidies at a landscape-scale. On the other hand, the chlorophyll-a concentration appears to be primarily regulated by specific local conditions resulting in a weak temporal coherence among the ecosystems. We concluded that temporal coherence in tropical ecosystems is possible, at least for some environmental features, and should be evaluated for other tropical ecosystems. Our results also reinforce that aquatic ecosystems should be studied more broadly to accomplish a full understanding of their structure and function.Keywords: synchrony, temporal coherence, local factors, regional factors, shallow lakes, coastal lagoons. Coerência temporal entre lagoas costeiras tropicais: uma busca por padrões e mecanismos ResumoA coerência temporal (i.e., o nível de sincronismo de uma dada variável ecológica entre unidades ecológicas) tem sido demonstrada para uma vasta gama de variáveis limnológicas em lagos de clima temperado, permitindo que predições sobre a estrutura e o funcionamento destes ecossistemas sejam realizadas. Entretanto, há pouca evidência da coerência temporal de variáveis limnológicas entre ecossistemas aquáticos tropicais, onde a variação climática é menos pronunciada entre as estações do ano. Neste estudo, utilizamos dados de longa duração do monitoramento de variáveis físicas, químicas e biológicas para testar a ocorrência de coerência temporal entre 18 lagoas costeiras tropicais. A temperatura da água e a concentração de clorofila-a apresentaram, respectivamente, a maior e a menor coerência temporal entre as lagoas, enquanto que a salinidade e a coloração da água apresentaram padrões intermediários. Fatores climáticos regionais foram os principais fatores responsáveis pelos padrões de coerência da temperatura e coloração d...

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“…Due to the different usages, the reservoirs showed different nitrogen sources (Boyer et al 2002), resulting in probable distinct responses in the composition of the main food (phytoplankton) and, consequently, zooplankton (Burford and Pearson 1998, Hunt and Matveev 2005, Bozelli et al 2009). Ammonia, for example, which is predominant in the highly altered reservoirs (Borborema and Saco I), is easily assimilated by phytoplankton.…”

Section: Discussionmentioning

confidence: 99%

“…However, the different sources of pollution and the deterioration of water quality can lead to a differentiated composition of the community (Burford and Pearson 1998, Hunt and Matveev 2005, Bozelli et al 2009), even in systems located close to each other. And, this can be used as a tool to indicate the environment condition and help in management.…”

Section: Introductionmentioning

confidence: 99%

Can nearby eutrophic reservoirs sustain a differentiated biodiversity of planktonic microcrustaceans in a tropical semiarid basin?

Diniz

Júnior

2017

An. Acad. Bras. Ciênc.

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This paper aims to compare alpha and beta diversities of planktonic microcrustaceans from three reservoirs located nearby in a tropical semiarid basin. Our hypothesis was that alpha and beta diversities of the community are different, although the ecosystems are located close to each other. We carried out two sampling campaigns: dry and rainy seasons. The sampling of microcrustaceans and environmental variables (dissolved oxygen, chlorophyll a and nutrient) was performed at twelve stations and were distributed throughout the three zones (river, transition, and lacustrine), using a plankton net (45 µm). The reservoirs showed different uses and types of nitrogen predominance: Cachoeira (supply/nitrate), Borborema (sewage/ammonia) and Saco (aquaculture/ammonia). Seventeen species were recorded whose richness was assessed as particularly specific to each one of the studied reservoirs. Seasonally, both reservoirs with high anthropogenic alteration showed greater richness in the dry season. The three reservoirs located in a same basin showed different richness and composition, but the diversity did not differ between the zones of the reservoirs. Although communities are close to each other, their composition and richness were found to be distinct for each reservoir. This may be in response to the peculiar particularities, such as nitrogen sources and the different uses.

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Interactive effects of environmental variability and human impacts on the long-term dynamics of an Amazonian floodplain lake and a South Atlantic coastal lagoon

Cited by 37 publications

References 46 publications

Spatio-Temporal Patterns and Source Identification of Water Pollution in Lake Taihu (China)

Spatio-Temporal Patterns and Source Identification of Water Pollution in Lake Taihu (China)

Temporal coherence among tropical coastal lagoons: a search for patterns and mechanisms

Can nearby eutrophic reservoirs sustain a differentiated biodiversity of planktonic microcrustaceans in a tropical semiarid basin?

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