Temperature and salinity regimes in a shallow, mesotidal lagoon, the Ria Formosa, Portugal

Newton, Alice; Mudge, Stephen M.

doi:10.1016/s0272-7714(02)00332-3

Cited by 149 publications

(86 citation statements)

References 6 publications

(9 reference statements)

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“…These combined phenomena put at risk not only the Algarve's traditional heritage (Vaz, Cabral, et al 2012), but also its environmental ecological equilibrium (Newton and Mudge 2003), and therefore the underlying causes should be further investigated, and combined with quantitative methods borrowed from landscape ecology (Riitters et al 1995) and economic rationale, complemented with integrating spatial methodologies. In general, the Western economic growth pattern is characterized by a slow decline of many agricultural activities which, having become more mechanized and intensive, reduce labor and, eventually, the share of rural areas used exclusively for agricultural purposes.…”

Section: Discussion and Explanation Of Landscape Changesmentioning

confidence: 99%

Exploratory Landscape Metrics for Agricultural Sustainability

Vaz

Noronha

Nijkamp

2013

Agroecology and Sustainable Food Systems

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Section: Discussion and Explanation Of Landscape Changesmentioning

confidence: 99%

Exploratory Landscape Metrics for Agricultural Sustainability

Vaz

Noronha

Nijkamp

2013

Agroecology and Sustainable Food Systems

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“…The aims of this study were to: 1) evaluate the short-and longterm temporal variation of pelagic nutrients and oxygen, which are part of the physicochemical quality elements described in the WFD as state indicators, and pelagic chlorophyll, which is part of the biological indicators relating to phytoplankton biomass; and 2) assess the importance of sediments in the system dynamics 15 It has an extension of 55 km (E-W, from Ancão to Cacela) and a maximum width of 6 km (N-S). 15 The lagoon covers an area of 100 km 2 with a mean depth of 1.5 m.…”

mentioning

confidence: 99%

Sediment and waternutrients and microalgae in a coastal shallow lagoon, Ria Formosa (Portugal): Implications for the Water Framework Directive

et al. 2010

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Coastal shallow lagoons are considered to be highly important systems, which have specific biogeochemical cycles and characteristics. The assessment of sediment-water interfaces is essential to understand nutrient dynamics and to evaluate the vulnerability to eutrophication, especially in regions of restricted water exchange (RRE), such as the Ria Formosa, which have natural conditions for the accumulation of nutrients. Water samples were collected during the years of 2006 and 2007-08 for nutrients, chlorophyll a and dissolved oxygen. Sediment samples were also collected for pore water nutrients and microphytobenthic chlorophyll a. Measurements of temperature, salinity and photosynthetic active radiation were also taken. The lagoon salinity is affected by occasional strong rainfall events. From comparison with previous work, a decrease in the nitrogen concentration in the water column can be observed, which may indicate an improvement of the water quality. Pore water nutrient concentrations were significantly larger than in the water column. Sediment-water exchanges are considered to be the most important processes in nutrient dynamics of the lagoon. Benthic microalgal biomass was also large compared with that of the phytoplankton. It represents about 99% of the total microalgal chlorophyll biomass of the system. The lagoon also contains (discontinuous) meadows of intertidal seagrass, but we did not study these. Due to the importance of sediments, the standard monitoring plans required by the Water Framework Directive may fail to track changes in the nutrient conditions and the microalgal responses to them.

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“…The lagoon has several channels and a large inter-tidal area covered by sand, muddy sand-flats, and salt marshes (Falcão and Vale 1990). It extends for 55 km along the coastline and has a maximum width of 6 km (Newton and Mudge 2003). The hydrodynamics is forced mainly by the semidiurnal tidal regime exchanging water to the sea through several inlets (Nobre et al 2005).…”

Section: Study Area and Sampling Designmentioning

confidence: 99%

Enhanced trace element concentrations in tissues of the clam <em>Ruditapes decussatus</em> transplanted to areas influenced by human activities (Ria Formosa, Portugal)

et al. 2017

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Summary:To examine the extent to which human activities near the Ria Formosa coastal lagoon influence the accumulation of trace elements (TE) in Ruditapes decussatus, individuals were transplanted from a natural bank located in the lower lagoon to three sites located in clam growth grounds under the influence of a small city (Faro), a fish farming centre (Olhão) and a site near the lagoon inlet (Lavajo). Concentrations were determined in substrate of the clam grounds and in the digestive gland, gills, mantle plus siphons, and remaining tissues of clams in four periods of the year. These measurements were accomplished with the monthly survey of the gametogenic stages, condition index, proteins, glycogen, total lipids, pH and osmolarity of hemolymph. Arsenic, Cu, Mn, V, Cr and Pb were preferentially linked to the digestive gland, while Cd was linked to the gills. TE concentrations in the digestive gland and remaining tissues were higher in winter, most likely reflecting additional inputs associated with rain. The lack of disruptions in biological parameters and the prolonged period of spawning and gonad recovery in clams suggest that the current TE availability in the lagoon has a minor influence on the reproductive cycle and hence on clam production. Keywords: trace elements; biological parameters; Ruditapes decussatus; Ria Formosa. Aumento de la concentración de elementos traza en tejidos de la almeja Ruditapes decussatus trasplantada a zonas influenciadas por actividades humanas (ría Formosa, Portugal)Resumen: Para examinar en qué medida las actividades humanas cercanas a la laguna costera ría Formosa influyen en la acumulación de elementos traza (ET) en Ruditapes decussatus, se trasplantaron individuos desde un banco natural situado en la parte baja de la laguna a tres sitios localizados en zonas de cultivo de almejas bajo la influencia de una ciudad pequeña (Faro), un centro piscícola (Olhão) y cerca de la entrada de una laguna (Lavajo). Se determinaron las concentraciones de ET en el substrato de locales y en la glándula digestiva, branquias, manto más sifones, y en los tejidos restantes de las almejas en cuatro períodos a lo largo de un año. Estas mediciones fueron realizadas con el estudio mensual de las etapas gametógenas, índice de condición, proteínas, glicóneo, lípidos totales, pH y osmolaridad de la hemolinfa. El As, Cu, Mn, V, Cr y Pb fueron relacionados preferencialmente a la glándula digestiva, mientras que el Cd fue a las branquias. La concentración de ET en la glándula digestiva y los tejidos restantes fue más elevada en invierno, probablemente reflejando los aportes adicionales asociados con la lluvia. La falta de alteraciones de los parámetros biológicos, el período prolongado de desove y la recuperación de las gónadas en las almejas sugieren que la disponibilidad actual de ET en la laguna tienen una influencia menor durante el ciclo reproductivo y, por lo tanto, en la producción de almejas.

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Temperature and salinity regimes in a shallow, mesotidal lagoon, the Ria Formosa, Portugal

Cited by 149 publications

References 6 publications

Exploratory Landscape Metrics for Agricultural Sustainability

Exploratory Landscape Metrics for Agricultural Sustainability

Sediment and waternutrients and microalgae in a coastal shallow lagoon, Ria Formosa (Portugal): Implications for the Water Framework Directive

Enhanced trace element concentrations in tissues of the clam <em>Ruditapes decussatus</em> transplanted to areas influenced by human activities (Ria Formosa, Portugal)

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