Short- and Long-Term Chlorophyll a Variability in the Shallow Microtidal Patos Lagoon Estuary, Southern Brazil

Abreu, Paulo César; Bergesch, Marli; Proença, Luís Antônio de Oliveira; Garcia, Carlos Alberto Eiras; Odebrecht, Clarisse

doi:10.1007/s12237-009-9181-9

Cited by 85 publications

(65 citation statements)

References 43 publications

(51 reference statements)

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“…However, during periods of high river discharge (April, May and December 2010 and January 2011) a decrease in the phytoplankton biomass resulting in significant differences in concentrations of chlorophyll-a as between the dry and rainy seasons was observed. Very high levels of rainfall can depress the accumulation of phytoplankton biomass since they reduce the water residence time, washing out most of the organic matter produced and impeding the accumulation of phytoplankton, as observed in other estuaries (ABREU et al, 2010;ZINGONE et al, 2010). The tidal renewal of water and strong fresh water inflow due to precipitation can also promote a dilution of nutrient concentrations in the estuary, but the effects of these processes are prevented in the analysis by the use of the normalized mixing diagram.…”

Section: Discussionmentioning

confidence: 99%

SPATIAL AND TEMPORALVARIATION OF DISSOLVED INORGANIC NUTRIENTS, AND CHLOROPHYLL-α IN a TROPICAL ESTUARY IN NORTHEASTERN BRAZIL: DYNAMICS OF NUTRIENT REMOVAL

2015

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Monthly sampling campaigns were carried out between February 2010 and January 2011 to evaluate the spatial and temporal distribution of nutrients (ammonium, nitrite, nitrate, dissolved organic nitrogen, phosphate, dissolved organic phosphorus and silicate) and chlorophyll-a along a salinity gradient in the tropical Cachoeira River estuary, subject to the untreated effluents of a sewage treatment plant (STP). During the study period the lowest and highest river discharge occurred in February and April 2010, respectively. High river outflow promoted increased concentrations of inorganic nitrogen and silicate but did not affect the concentration of phosphate. Based on the chlorophyll-a concentration the estuary may be classified as eutrophic / hypereutrophic in its inner portion and mesotrophic in the lower region. The inner portion is more affected by the nutrient load carried out by the river and STP, while dilution by seawater contributed to the reduction of the nutrient concentrations in the lower reaches of the estuary. The results indicate that nutrient uptake by the phytoplankton is the most effective dissolved inorganic nutrient removal processes, especially for phosphate. Mixing diagrams suggest that the coupling of nitrification and denitrification processes is also responsible for the elimination of nitrogen from this ecosystem. R E S U M OCampanhas de amostragens mensais foram realizadas entre fevereiro de 2010 e janeiro de 2011 para avaliar a distribuição espacial e temporal de nutrientes (amônia, nitrito, nitrato, nitrogênio orgânico dissolvido, fosfato, fósforo orgânico dissolvido e silicato) e clorofila-a, ao longo do gradiente de salinidade no estuário tropical do Rio Cachoeira. Este estuário é sujeito aos efluentes de esgotos não tratados de uma estação de tratamento de esgoto (ETE). No período estudado a maior e menor vazão do rio ocorreram em fevereiro e abril de 2010, respectivamente. A alta vazão do rio promoveu aumento das concentrações de nitrogênio inorgânico e silicato, mas não afetou as concentrações de fosfato. Baseado nas concentrações de clorofila-a, o estuário pode ser classificado como eutrófico/hipereutrófico na porção interna e mesotrófico na região externa. A porção interna é mais afetada pela carga de nutrientes do rio e da ETE, enquanto a diluição pela água marinha contribuiu para diminuir as concentrações de nutrientes na porção externa. Os resultados indicam que a absorção de nutrientes pelo fitoplâncton é o processo mais eficiente na remoção desses nutrientes, especialmente do fosfato. No entanto, os diagramas de mistura sugerem que a nitrificação e denitrificação acopladas no rio também são responsáveis pela eliminação do nitrogênio do ecossistema.

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Section: Discussionmentioning

confidence: 99%

SPATIAL AND TEMPORALVARIATION OF DISSOLVED INORGANIC NUTRIENTS, AND CHLOROPHYLL-α IN a TROPICAL ESTUARY IN NORTHEASTERN BRAZIL: DYNAMICS OF NUTRIENT REMOVAL

2015

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“…Short-term fluctuations also result from individual species succession causing stochastic bloom occurrence: coccolithophores, dinoflagellates, cyanobacteria or diatoms can produce massive blooms under favourable growing conditions (Smayda 1998;Siegel et al 2007;Paerl et al 2010). Wind events that influence exchange of water masses with the ocean can also cause random, short-lived blooms in estuaries and coastal lagoons (Abreu et al 2010). -Shift in periodicity.…”

Section: Annual Cycles Of Phytoplankton Biomassmentioning

confidence: 99%

The annual cycles of phytoplankton biomass

Winder

Cloern

2010

Phil. Trans. R. Soc. B

254

170

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Terrestrial plants are powerful climate sentinels because their annual cycles of growth, reproduction and senescence are finely tuned to the annual climate cycle having a period of one year. Consistency in the seasonal phasing of terrestrial plant activity provides a relatively low-noise background from which phenological shifts can be detected and attributed to climate change. Here, we ask whether phytoplankton biomass also fluctuates over a consistent annual cycle in lake, estuarine -coastal and ocean ecosystems and whether there is a characteristic phenology of phytoplankton as a consistent phase and amplitude of variability. We compiled 125 time series of phytoplankton biomass (chlorophyll a concentration) from temperate and subtropical zones and used wavelet analysis to extract their dominant periods of variability and the recurrence strength at those periods. Fewer than half (48%) of the series had a dominant 12-month period of variability, commonly expressed as the canonical spring-bloom pattern. About 20 per cent had a dominant six-month period of variability, commonly expressed as the spring and autumn or winter and summer blooms of temperate lakes and oceans. These annual patterns varied in recurrence strength across sites, and did not persist over the full series duration at some sites. About a third of the series had no component of variability at either the six-or 12-month period, reflecting a series of irregular pulses of biomass. These findings show that there is high variability of annual phytoplankton cycles across ecosystems, and that climate-driven annual cycles can be obscured by other drivers of population variability, including human disturbance, aperiodic weather events and strong trophic coupling between phytoplankton and their consumers. Regulation of phytoplankton biomass by multiple processes operating at multiple time scales adds complexity to the challenge of detecting climate-driven trends in aquatic ecosystems where the noise to signal ratio is high.

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“…The wide variety of subtropical coastal lagoons have been classified according to the type of entrance channel into choked, restricted or leaky lagoons (Perillo et al, 1999), distinguished by the freshwater or marine prevailing influence (Abreu et al, 2010) or by the depth and substratum characteristics (Nichols and Boon, 1994). All the same, biological productivity in subtropical coastal lagoons is influenced by hydrodynamic processes such as water residence time (Badylak Cervantes-Duarte, R., Prego, R., López-López, S., Aguirre-Bahena, F., and Ospina-Alvarez, N. (2013) Annual patterns of nutrients and chlorophyll in a subtropical coastal lagoon under the upwelling influence (SW of Baja-California Peninsula), Estuarine, Coastal and Shelf Science 120, 54-63 .…”

Section: -Introductionmentioning

confidence: 99%

“…So, in the subtropical lagoons with estuarine zones the nutrient inputs are mainly connected with the rainfall season (Eyre 2000; Lehrter 2008;Abreu et al, 2010) and chlorophyll concentration increased up to four times the observed during the dry season (Phlips et al, 2012). On a local level in Bahia-Magdalena, the presence of a mangle forest in the littoral zone (Acosta Velázquez and Ruiz-Luna, 2007) and the phosphorite ores from neighboring areas that are loaded at San-Carlos port increased the ammonium and phosphate concentrations in the shore waters.Consequently, in keeping with the typology of Abreu et al (2010), Bahia-Magdalena can be classified among the coastal lagoons which have a prevailing marine influence, such as was emphasized by the salinities higher than 35 in the inner lagoon zone, showing the very scarce continental freshwater inputs during all the year (Fig.4). It is in the outer zone of the lagoon where the influence of the sea can be clearly identified.…”

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confidence: 99%

Annual patterns of nutrients and chlorophyll in a subtropical coastal lagoon under the upwelling influence (SW of Baja-California Peninsula)

Cervantes‐Duarte

Prego²,

López-López

et al. 2013

Estuarine, Coastal and Shelf Science

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Abstract. The coastal lagoon of Bahía-Magdalena, located on the west coast of the Peninsula of Baja-California, is a subtropical ecosystem with an arid climate and very little freshwater input. During the 2005-2011 period the thermohaline properties varied between cold and warm halfyearly periods. They were influenced by the Transitional Water mass transported by the South California Current from February to July and by the Subtropical Surface Water from August to January. The nutrient concentrations increased (viz up to 16 µM of nitrate) from March to June, when the upwelling index was the highest. Similarly, the inter-annual variation of chlorophyll-a showed a six-monthly pattern with the highest average monthly concentrations being found in June (5 mg·m -3 in situ or 8 mg·m -3 based on satellite information) and the lowest in DecemberJanuary. A spatial zoning was also observed in the lagoon with a shallow inner zone that is warmer and richer in chlorophyll-a than the deeper closed mouth area. In the Bahía-Magdalena lagoon a spatial-temporal division into two zones and two seasons was repeated year after year with only minor differences. During the first semester in the outer zone, years 2006 and 2007 were colder and nutrient rich while 2010 was warmer, according to the upwelling conditions in the Southern California Region. Hence, among the coastal lagoons that present a prevailing marine influence, the coastal system of Bahía-Magdalena corresponds to an unusual type of subtropical coastal lagoon where the nutrient input is mainly due to upwelling phenomena.Keywords: inter-annual, intra-annual, biogeochemistry, California Current, chocked lagoon, Bahía-Magdalena, Pacific coast, Mexico. -INTRODUCTIONContinental shelf waters represent 8% of the Earth's oceanic surface but it is where nearly 25% of the primary sea production occurs (Walsh, 1989) and where a variety of types of coastal systems, which determine the exchange between land and sea, are found. In these systems, coastal lagoons, making up 13% of the coastal areas worldwide, are predominant (Kjerve 1994). Coastal lagoons are inland water bodies, usually oriented parallel to the coast, separated from the sea by a barrier and connected to the ocean by one or more restricted inlets (Kjerfve and Magill 1989). In the subtropical climate region bordering, as delimited by Perillo et al. (1999), the Tropics of Cancer and Capricorn (23.5° latitude) and the temperate region (40° latitude), coastal lagoons are subject to a wide climatic diversity ranging from monsoons to desert-like conditions. In all of these climate types the availability of nutrients restricts biological richness (Salomons et al., 2005). Despite this fact, subtropical coastal lagoons have not been studied extensively from a biogeochemical viewpoint, rather it is the ecological aspects that have undergone a more indepth examination (Kjerfve, 1994).The wide variety of subtropical coastal lagoons have been classified according to the type of entrance channel into choked, restricted or leaky lago...

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Short- and Long-Term Chlorophyll a Variability in the Shallow Microtidal Patos Lagoon Estuary, Southern Brazil

Abstract: In the shallow microtidal Patos Lagoon estuary, southern Brazil (32°07′ S-52°06′

Cited by 85 publications

References 43 publications

SPATIAL AND TEMPORALVARIATION OF DISSOLVED INORGANIC NUTRIENTS, AND CHLOROPHYLL-α IN a TROPICAL ESTUARY IN NORTHEASTERN BRAZIL: DYNAMICS OF NUTRIENT REMOVAL

SPATIAL AND TEMPORALVARIATION OF DISSOLVED INORGANIC NUTRIENTS, AND CHLOROPHYLL-α IN a TROPICAL ESTUARY IN NORTHEASTERN BRAZIL: DYNAMICS OF NUTRIENT REMOVAL

The annual cycles of phytoplankton biomass

Annual patterns of nutrients and chlorophyll in a subtropical coastal lagoon under the upwelling influence (SW of Baja-California Peninsula)

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