Assessing the trophic state of Linhos lake: a first step towards ecological rehabilitation

Pereira, Ruth; Soares, Amadeu M.V.M.; Ribeiro, Rui; Gonçalves, Fernando

doi:10.1006/jema.2001.0521

Cited by 25 publications

(23 citation statements)

References 57 publications

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“…Consequently, zooplankton is constantly exposed to a great variation of environmental factors, whose fluctuations constrain the size, reproduction and survival of populations. Because of its quick response to environmental change, zooplankton can be regarded as an indicator of disturbance events (Lampert and Sommer, 1997;Jeppesen et al, 1999;Pereira et al, 2002;Abrantes et al, 2009;Obertegger et al, 2010). Therefore, zooplankton can be directly or indirectly influenced by precipitation events.…”

Section: Introductionmentioning

confidence: 99%

Limnological variations of a deep reservoir in periods with distinct rainfall patterns

Geraldes

George²

2013

Acta Limnol. Bras.

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Aim: This study intends to provide information on how precipitation variation may impact environmental parameters (total phosphorus, water temperature, pH, conductivity, dissolved oxygen, Secchi depth, chlorophyll a and Anabaena abundance) and crustacean zooplankton composition and abundance. Methods: Samples were collected monthly from October 2000 to September 2002 and from October 2007 to September 2009 at one single sampling station located at the deepest point of the reservoir. All data were obtained in the euphotic zone. Results: The highest values of total phosphorous concentrations were reported together with the maximal values of precipitation. Conversely, conductivity decreased during the wet periods. Anabaena presence was only detected between September and December 2001. Daphnia longispina total abundance showed large inter-annual differences. A clear seasonal pattern was inferred for Diaphanosoma brachyurum and Ceriodaphnia pulchella. Both species are thermophilic and begin to be detected in early summer when the water temperature is around 15 °C. Copidodiaptomus numidicus abundance did not present a clear seasonal pattern. Conclusions: Some of the observed shifts in environmental parameters (Conductivity, total phosphorus concentrations and Anabaena abundance) resulting in changes in zooplankton abundance are induced by rainfall variation. The most affected species were those with a lack of seasonality (C. numidicus) or species occurring mainly in winter/early summer (Daphnia longispina). However, a wide range of physical, chemical and biotic interactions is likely to influence zooplankton abundance. Therefore, caution is advised when relating the observed variation exclusively with rainfall intensity. In fact, some of the observed shifts were induced by other factors varying subtly in a seasonal or inter-annual pattern, independently of rainfall intensity.Keywords: rainfall, wet and dry periods, deep reservoir limnology, crustacean zooplankton assemblage, Anabaena flos-aquae. Resumo: Objectivo:Com o presente estudo pretende-se obter informação sobre os impactos da variação da precipitação nas concentrações de fósforo total, de clorofila a, oxigénio dissolvido, condutividade e profundidade do disco de Secchi, bem como na abundância de Anabaena flos-aquae e das espécies mais abundantes de crustáceos zooplactónicos. Métodos: As amostragens foram realizadas mensalmente de Outubro de 2000 a Setembro de 2002 e de Outubro de 2007 a Setembro de 2009 num único ponto localizado na zona mais profunda do reservatório. Todos os dados foram obtidos na zona eufótica. Resultados: As concentrações de fósforo total foram mais elevadas durante os períodos de maior precipitação. Por seu turno, a condutividade decresceu durante os períodos mencionados. Anabaena só foi detetada entre Setembro e Dezembro de 2001. A abundância de Daphnia longispina sofreu grandes variações durante o decurso deste estudo. Diaphanosoma brachyurum e Ceriodaphnia pulchella apresentaram sempre um forte padrão sazonal. Ambas as espéc...

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Section: Introductionmentioning

confidence: 99%

Limnological variations of a deep reservoir in periods with distinct rainfall patterns

Geraldes

George²

2013

Acta Limnol. Bras.

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“…This resulted in an underestimation of the essential role of zooplankton in trophic dynamic of rivers (Lair, 2006). On the other hand, studies on zooplankton community may be useful in predicting long-term changes in aquatic ecosystems, since they are very sensitive to environmental variations (Branco et al, 2000;Pereira et al, 2002). Its spatial and temporal patterns are of crucial importance for understanding ecosystem functioning because it can affect its processes and stability, and it can constitute a quickly response to major shifts in environmental conditions (Suikkanen et al, 2007;Zhou et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Spring rotifer community structure in the Alcantara River (Sicily, Italy), using different mesh size nets: relation to environmental factors

Rodríguez

Granata

Guglielmo

et al. 2013

Ann. Limnol. - Int. J. Lim.

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-The present study focus on some aspects of zooplankton structure in the Alcantara River (Sicily, Italy), in relation to environmental factors. Zooplankton samplings were performed in spring in four sites, located from up-to downstream along the river course. Four low-flow velocity station points were chosen along a transversal river section in each site. Samples were taken from all station points in the four sites by two different mesh sizes (55 and 100 mm) rectangular nets. Rotifer abundances were an order of magnitude higher in 55 mm mesh size samples than in 100 mm mesh size ones. The two communities also resulted significantly different (ANOSIM test, r = 0.212; P = 0.1%). Generally, low abundances (from 3470 ¡ 5133 to 422 ¡ 474 ind.m x3 ) were explained by low chlorophyll a concentration and the highflow regime of this river. Rotifer dominated the zooplankton community. Cladocerans, copepods and nauplii occurred with considerably lower abundances than rotifers. However, the relative contributions of these taxa to total abundances depended on the mesh sizes used. Euchlanis and Adineta genera exhibited the highest abundances in the rotifer assemblage. Conductivity alone or in association with temperature and dissolved oxygen was the most important environmental factor affecting rotifer community distribution. Cephalodella sp., Lepadella sp. and Trichotria pocillum showed a high positive relation to pico-plankton, showing this fraction as a possible rotifer food item. This paper demonstrated a higher efficiency of the finest net to characterize riverine zooplankton community that increases from up to downstream in terms of abundances and diversity.

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“…In particular zooplankton, are excellent indicators of the trophic status of a lake, due to their pivotal position in food web and top-down feedback mechanisms (Beaver and Havens, 1996;Jeppesen et al, 1999;Scheffer, 1999;Pereira et al, 2002). Zooplankton abundance can indicate the variation in trophic status, so it is regarded as a sensitive tool for monitoring eutrophication (Whitman et al, 2004;Pereira et al, 2002;Silva et al, 1997;Magadza, 1994).…”

Section: Introductionmentioning

confidence: 99%

Short-term effects of drawing water for connectivity of rivers and lakes on zooplankton community structure

Wu¹,

Liu²,

Zhang³

et al. 2008

Journal of Environmental Sciences

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Assessing the trophic state of Linhos lake: a first step towards ecological rehabilitation

Cited by 25 publications

References 57 publications

Limnological variations of a deep reservoir in periods with distinct rainfall patterns

Limnological variations of a deep reservoir in periods with distinct rainfall patterns

Spring rotifer community structure in the Alcantara River (Sicily, Italy), using different mesh size nets: relation to environmental factors

Short-term effects of drawing water for connectivity of rivers and lakes on zooplankton community structure

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