Changes in mangrove extension at the Pacoti River estuary, CE, NE Brazil due to regional environmental changes between 1958 and 2004

Lacerda, Luiz Drude de; Menezes, Marcelo Oliveira Teles de; Molisani, Maurício Mussi

doi:10.1590/s1676-06032007000300007

Cited by 47 publications

(29 citation statements)

References 7 publications

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“…CHAALALI et al, 2013) of PAC and PIR in the dry season led to changes in the species composition, with an emergence of marine species and a decrease in phytoplankton biomass. LACERDA et al (2007) ) mostly due to alterations in freshwater supply and sediment accumulation in consequence of river damming. Changes due to climate changes were also not ruled out by these authors.…”

Section: Discussionmentioning

confidence: 99%

Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

2016

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This study evaluated changes in phytoplankton and nutrients after an increase in river discharge in four estuaries of northeastern Brazil. Samples were taken during a markedly freshwater-deprived period (Nov/2010, dry season), and during a rainy season (May/2011). While two estuaries are located in urban areas (Ceará -CE and Cocó -CO), the others are markedly freshwater-deprived (Pacoti -PAC and Pirangi -PIR). Our findings indicate that increased freshwater had opposing effects on estuaries impacted by anthropogenic discharges (CO, CE and PIR) compared with the other, less impacted (PAC). In CO and CE, the freshwater flow during the rainy period had a nutrient diluting effect and controlled phytoplankton blooms. In PIR, only phosphorus and inorganic nitrogen decreased in the rainy season. In contrast, an increase of all nutrients was observed in PAC, and of TN in PIR, followed by an increase in phytoplankton biomass. In the rainy season, eutrophic freshwater species dominated in all the estuaries. In the dry season, blooms of Cryptomonas/Rhodomonas and Synechocystis aquatilis were, respectively, observed in CE and CO. Also in the dry season, PAC and PIR had a predominance of marine species under a condition of hypersalinity. Canonical correspondence analysis suggested the variation observed for salinity, silica, and TN are the main driver of phytoplankton structure. AbstrAct

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Section: Discussionmentioning

confidence: 99%

Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

2016

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“…, Lacerda et al. ;), adding to the probable influence of estuarine stress on H. emarginata in this area. The main impact seems to result from river damming, which has led to the formation of islands that are being covered by mangrove forest, partly occupying the habitat of other estuarine species (Lacerda et al.…”

Section: Discussionmentioning

confidence: 99%

Northern range extension of the seagrass Halodule emarginata Hartog

et al. 2016

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The seagrass Halodule emarginata is an endemic tropical species of Brazil, previously found from São Paulo to Bahia. The present study gives more ecological information of this species and report the extension of its northern range where it occurs in an estuarine area of Aquiraz‐Ceará, semiarid coast of Brazil. In November 2014, the meadow was discovered, georeferenced and mapped. Five cores were collected for morphometrical analyses of H. emarginata and associated florofaunistic species. Two beds of H. emarginata with areas of 177.8 m2 and 5012.3 m2 were identified in the estuary of the Pacoti River, indicating an extension of its known range by 1500 km to the north. Despite the emarginate apex, morphological patterns revealed that specimens were slightly less developed than previously described in the literature, probably due to estuarine stress. However, algal biodiversity (seven species) in the studied meadows was within the range observed for other estuarine meadows in Brazil, with presence of Rhodophyta and Chlorophyta. The main groups of invertebrate megafauna were present, including 13 taxa mainly of Mollusca, Crustacea and Polychaeta. This meadow will be monitored in order to understand its dynamics and relationships with other florofaunistic species and its responses to environmental variations.

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“…The decreasing river flow allows greater influence of the marine physical processes, causing greater salinity intrusion and sediment transport into the estuary. As a result, mangroves currently occupy an area twice as large as in the 50's (Lacerda et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Salinity Intrusion in the Guapimirim Estuary, Rio De Janeiro State, Brazil

Melo¹,

Neto²,

Vinzón³

et al. 2014

Rev. Bras. Geof.

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ABSTRACT. This work was conducted in the Guapimirim estuary, the main tributary of the Guanabara Bay. This system is located in a preserved area in the catchment basin of the bay, inside the Guapimirim Environmental Protection Area. The estuary presents a meandering channel with 3 meters mean depth. The aim of this work is to evaluate the salinity intrusion dynamics in response to the tide and freshwater discharge, as well as its effects on the water column structure and residence time. Surveys were performed to assess the salinity structure along the estuary main channel under different freshwater discharges (dry and rainy period) and tide (neap and spring). The results showed significant differences in the water column structure, presenting high stratification in neap tide and conditions homogeneous in spring tide. The salinity front (SF) showed a bigger displacement in the spring tide. Under highly stratified conditions, in neap tide, its displacement was bigger with smaller tidal amplitude. The location of SF inside of the estuary, in the high water, was influenced manly by freshwater discharge. The residence time in the Guapimirim estuary was longer in neap tide and dry period, presenting a good relationship with freshwater discharge.Keywords: Guapimirim estuary, salinity intrusion, residence time.RESUMO. Este trabalho foi desenvolvido no estuário de Guapimirim, principal tributário da Baía de Guanabara. Este sistema se localiza em umaárea ainda preservada na bacia de drenagem da baía, dentro daÁrea de Proteção Ambiental de Guapimirim. O estuário apresenta um canal meandrante com uma profundidade média de 3 metros. O objetivo deste trabalho consiste em avaliar a dinâmica da intrusão salina em resposta a atuação dos processos físicos como a vazão fluvial e a maré, assim como, sua consequência na estrutura da coluna d'água e tempo de residência. Foram realizados levantamentos sobre a estrutura salina ao longo do canal principal do estuário em diferentes condições de vazão fluvial (período seco e chuvoso) e maré (quadratura e sizígia). Os resultados mostraram diferenças marcantes na estrutura da coluna d'água sendo estratificado em maré de quadratura e mais homogêneo em maré de sizígia. A frente salina apresentou um maior deslocamento em maré de sizígia.Em condições de alta estratificação, em maré de quadratura, o maior deslocamento da frente salina esteve associado a uma menor amplitude da maré. A vazão fluvial foi o principal processo físico que atuou no alcance máximo da frente salina. O tempo de residência de uma parcela deágua dentro do estuário de Guapimirim foi maior em condição de maré de quadratura e em período seco, apresentando boa relação com a vazão fluvial.Palavras-chave: estuário de Guapimirim, intrusão salina, tempo de residência.

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Changes in mangrove extension at the Pacoti River estuary, CE, NE Brazil due to regional environmental changes between 1958 and 2004

Cited by 47 publications

References 7 publications

Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

Influence of river discharge on phytoplankton structure and nutrient concentrations in four tropical semiarid estuaries

Northern range extension of the seagrass Halodule emarginata Hartog

Salinity Intrusion in the Guapimirim Estuary, Rio De Janeiro State, Brazil

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