Spatio-temporal Dynamics of Phytoplankton and Microphytobenthos in a South African Temporarily-open Estuary

Perissinotto, Renzo; Nozais, Christian; Kibirige, Israel

doi:10.1006/ecss.2001.0885

Cited by 79 publications

(41 citation statements)

References 6 publications

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“…Therefore, due to the small size and low freshwater inflow associated with the Hartenbos Estuary, as well as closed mouth conditions, it can be expected that eutrophic conditions will occur in this system. Observations from a similar system were made along the KwaZulu-Natal south coast (South Africa) in a study by Perissinotto et al (2002). It was shown that the temporarily open/closed Mpenjati Estuary, on the receiving-end of a WWTP discharge into the estuary, showed clear signs of eutrophication with microphytobenthic chlorophyll a concentrations found to be as high as 616 mg•m -2 chl a.…”

Section: Wastewater Treatment Plantsmentioning

confidence: 92%

Nutrient characterisation of river inflow into the estuaries of the Gouritz Water Management Area, South Africa

Lemley

Taljaard²,

Adams³

et al. 2014

WSA

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This study provides an overview of the nutrient status of river inflow into the estuaries within the Gouritz Water Management Area (WMA) of South Africa. Riverine inputs are a major source of macronutrients to estuaries and the adjacent coastal environments. Long-term water quality monitoring data (dissolved inorganic nitrogen, i.e. DIN; and dissolved inorganic phosphorus, i.e. DIP), collected by the Department of Water Affairs (DWA), were used to assess historical trends of river nutrient inflow within the Gouritz WMA. The results indicate that DIP concentrations exceeded the eutrophic limits for aquatic ecosystems (DWA) in 50% of the catchments assessed. Anthropogenic activities such as agriculture, wastewater discharge, urbanisation, and afforestation were significant factors influencing nutrient levels within these rivers. For the majority of the river systems (approx. 80%) there was no significant correlation (P > 0.05) between inorganic nutrient levels and freshwater inflow from the catchments. Wastewater treatment plant (WWTP) data (DWA) were assessed to explore the reasons for this 'disconnect' between freshwater inflow and inorganic nutrient levels. The Gwaing and Hartenbos estuaries would be most vulnerable to increased nutrient loading because of their small size and prolonged periods of mouth closure. The study highlights the importance of water quality monitoring of river inflows into coastal ecosystems, as it is needed to assess pollution trends and identify management priorities.

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Section: Wastewater Treatment Plantsmentioning

confidence: 92%

Nutrient characterisation of river inflow into the estuaries of the Gouritz Water Management Area, South Africa

Lemley

Taljaard²,

Adams³

et al. 2014

WSA

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“…No ambiente estudado, observou-se que a biomassa, juntamente com a densidade, foi influenciada diretamente pela hidrodinâmica, que faz com que haja uma maior ressuspensão dos sedimentos disponibilizando nutrientes para a coluna d'água (ODEBRECHT; GARCIA, 1998;VIDEAU et al, 1998;PERISSINOTTO et al, 2002).…”

Section: Discussionunclassified

Fitoplâncton como ferramenta de gestão ambiental na praia de Brasília Teimosa, Pernambuco, nordeste do Brasil.

Ferreira¹,

Cunha²,

Firmo³

et al. 2013

TropOcean

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O objetivo deste trabalho foi avaliar os parâmetros ambientais, biomassa, comunidade fitoplanctônica e espécies bioindicadoras, como ferramenta de gestão ambiental na praia Brasília Teimosa, Pernambuco (8º04’S; 34º52’W). Parâmetros abióticos (precipitação, temperatura da água, salinidade, material em suspensão, teor e taxa de saturação do oxigênio, nitrito, nitrato, fosfato e silicato) foram obtidos simultaneamente às coletas de fitoplâncton (garrafa e rede) no período chuvoso (maio; junho e julho/2005) e de estiagem (novembro e dezembro/2005; janeiro/2006). Com exceção dos valores de nitrato (maiores no período chuvoso), os demais parâmetros estiveram dentro dos padrões recomendados. Foram identificados 84 taxa, com maior representatividade das diatomáceas em abundância e frequência, Asterionellopsis glacialis, Chaetoceros lorenzianus, Cylindrotheca closterium, Helicotheca tamesis, Licmophora abbreviata e Skeletonema costatum. Altos níveis de nitrato, clorofila a, número de células por litro e espécies bioindicadores de eutrofização (Oscillatoria sp., Scenedesmus sp., Euglena sp., Synedra sp., Pleurosigma sp., Pseudo-nitzschia sp. e Skeletonema costatum) corroboraram a influência das atividades humanas na área, evidenciando um possível comprometimento da sanidade ambiental relacionado ao período de estiagem (período de maior exploração turística-recreativa). Palavras-chave: Bioindicadores, Clorofila a, Florescimentos, Diatomáceas.

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“…In particular, microphytobenthos does not require high conservatives light fluxes (Gattuso et al, 2006), hence, these phototrophs can cover wide areas of permeable sublittoral sediments. Microphytobenthos constitutes a food source for benthic feeders (Nozais et al, 2005) and can contribute up to 50% of total primary production (Perissinotto et al, 2002). During the last few decades, some works have been carried out on permeable sublittoral sands and oligotrophic zones e.g.…”

Section: Introductionmentioning

confidence: 99%

Benthic fluxes of oxygen and nutrients in sublittoral fine sands in a north-western Mediterranean coastal area

Sospedra

Falco

Morata

et al. 2015

Continental Shelf Research

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Elsevier Sospedra, J.; Falco, S.; Morata T.; Gadea, I.; Rodilla, M. (2015). Benthic fluxes of oxygen and nutrients in sublittoral fine sands in a north-western Mediterranean coastal area. Continental Shelf Research. 97:32-42. doi:10.1016Research. 97:32-42. doi:10. /j.csr.2015 AbstractTraditionally, benthic metabolism in sublittoral permeable sands have not been widely studied, although these sands can have a direct and transcendental impact in coastal ecosystems. This study aims to determine oxygen and nutrient fluxes at the sediment-water interface and the study of possible interactions among environmental variables and the benthic metabolism in well-sorted fine sands. Eight sampling campaigns were carried out over the annual cycle in the eastern coast of Spain (NW Mediterranean) at 9 meters depth station with permeable bottoms. Water column and sediment samples were collected in order to determine physico-chemical and biological variables.Moreover, in situ incubations were performed to estimate the exchange of dissolved solutes in the sediment-water interface using dark and light benthic chambers. Biochemical compounds at the sediment surface ranged between 160-744 µg g -1 for proteins, 296-702 µg g -1 for carbohydrates, and between 327-1224 µg C g -1 for biopolymeric carbon. Chloroplastic pigment equivalents in sediments were mainly composed by chlorophyll a (1.81-2.89 µg g -1 ).These sedimentary organic descriptors indicated oligotrophic conditions according to the biochemical approach used. In this sense, the most abundant species in the macrobenthic community were sensitive to organic owing to the highest incident irradiance levels (r=0.98, p<0.01) that stimulate microphytobenthic primary production. Microphytobenthos played an important role on benthic metabolism and was the main primary producer in this coastal ecosystem. However, an average annual uptake of 31 mmol m -2 d -1 of oxygen and a release of DIN and Si(OH) 4 (329 and 68 mmol m -2 d -1 respectively) were estimated in these bottoms, which means heterotrophic conditions.

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Spatio-temporal Dynamics of Phytoplankton and Microphytobenthos in a South African Temporarily-open Estuary

Cited by 79 publications

References 6 publications

Nutrient characterisation of river inflow into the estuaries of the Gouritz Water Management Area, South Africa

Nutrient characterisation of river inflow into the estuaries of the Gouritz Water Management Area, South Africa

Fitoplâncton como ferramenta de gestão ambiental na praia de Brasília Teimosa, Pernambuco, nordeste do Brasil.

Benthic fluxes of oxygen and nutrients in sublittoral fine sands in a north-western Mediterranean coastal area

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