Drought effects on pelagic properties in the shallow and turbid Patos Lagoon, Brazil

Odebrecht, Clarisse; Abreu, Paulo César; Möller, Osmar Olinto; Niencheski, Luís Felipe Hax; Proença, Luís Antônio de Oliveira; Torgan, Lezilda Carvalho

doi:10.1007/bf02732906

Cited by 43 publications

(36 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is typical of urban estuaries with strong anthropogenic impacts (e.g., dredging processes, dumping of municipal sewage), as documented for the Pina Basin (FEITOSA; FEITOSA et al, 1999;NASCIMENTO et al, 2003) and the Capibaribe River (KOENING et al, 1995). This process has been observed in many other urban areas (e.g., ALMEIDA et al, 2002;ODEBRECHT et al, 2005).…”

Section: Discussionsupporting

confidence: 56%

Phytoplankton dynamics in a highly eutrophic estuary in tropical Brazil

et al. 2010

View full text Add to dashboard Cite

A B S T R A C TThe port of Recife in northeastern Brazil is an important ecological and social area but little is known about its environmental quality. Observations, sampling and measurements of phytoplankton were performed during spring and neap tides in the dry (January-February, 2005) and rainy (June, 2005) seasons to assess the environmental quality of the port of Recife. The area had chlorophyll-a concentrations ranging from 3.30 to 54.40 mg m -3 , the highest values occurring at low tide during the dry season. A total of 129 species were identified: 53 of them in the dry season and 97 in the rainy season. Diatoms were the most diverse group and comprised 75.47% of the phytoplankton collected in the dry season and 60.82% of those collected in the rainy season. The dry season was characterized by Coscinodiscus sp. and Helicotheca tamesis; the rainy season by Oscillatoria sp. and Coscinodiscus centralis. Species diversity indices varied from 1.06 to 3.74 bits cel -1 . Low indices were related to the dominance of Helicotheca tamesis, Coscinodiscus centralis, Coscinodiscus sp. and Aulacoseira granulata. Seasonal forcing, rather than the estuarine flux, determined the phytoplankton community structure. The area is exposed to seasonally varying negative impacts due to metropolitan degradation and the high level of eutrophication. R E S U M OPara avaliar a qualidade ambiental Porto do Recife (Nordeste do Brasil), uma área ecológica e socialmente importante mas pouco investigada, observações, medições e amostragem do fitoplâncton foram realizadas durante as marés de sizígia e quadratura no período de estiagem (janeiro-fevereiro / 2005) e chuvoso (junho/2005). A área apresentou concentração de clorofila a variando de 3,30 a 54,40 mg m -3 , com maiores valores registrados durante a maré baixa no período de estiagem. Um total de 129 espécies foi identificada com 53 espécies durante o período de estiagem e 97 espécies no chuvoso. As diatomáceas formaram o grupo mais diverso, com 75,47% no período de estiagem e 60,82% no chuvoso. Coscinodiscus sp. e Helicotheca tamesis caracterizaram o período de estiagem e Oscillatoria sp. e Coscinodiscus centralis o período chuvoso. A diversidade de espécie variou de 1,06 a 3,74 bits cel -1 . Os baixos índices foram relacionados com a dominância de Helicotheca tamesis, Coscinodiscus centralis, Coscinodiscus sp. e Aulacoseira granulata. A sazonalidade determinou a estrutura da comunidade fitoplanctônica, em vez do fluxo estuarino. A área é exposta sazonalmente a vários impactos negativos, devido à degradação metropolitana e ao elevado nível de eutrofização.

show abstract

Section: Discussionsupporting

confidence: 56%

Phytoplankton dynamics in a highly eutrophic estuary in tropical Brazil

et al. 2010

View full text Add to dashboard Cite

show abstract

“…During summer, mixopolyhaline and euhaline waters are frequent in the estuary as a result of reduced continental freshwater discharge and the action of southerly winds forcing the coastal water through the main channel to reach the inner lagoon (Möller Jr. et al 1996, Odebrecht et al 2005. During summer, the coastal shelf is influenced by tropical water from the Brazil Current, with warm temperature (>20 °C), reduced nutrients and suspended matter, while in spring it is influenced by nutrient-rich cold water flowing northwards (Ciotii et al 1995), and phytoplankton diatom blooms are then commonly observed in the Patos Lagoon estuary (Odebrecht & Abreu 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Lagoon and Laranjal are mostly oligohaline to limnic (Bergesch 2003, Odebrecht et al 2005. As members of the Acanthoecidae are exclusively marine and brackish organisms , the absence in these stations can be explained by unfavorable low salinity water.…”

Section: Discussionmentioning

confidence: 99%

Loricate Choanoflagellates from the South Atlantic coastal zone (~32 °S) including the description of Diplotheca tricyclica sp. nov.

2008

View full text Add to dashboard Cite

The biodiversity of marine heterotrophic protists is poorly known in the South Atlantic coastal zone (~32 °S) especially regarding the nanoflagellates. The presence of loricate choanoflagellates was reported for the first time in the Patos Lagoon estuary and the adjacent coastal zone. Seventeen species of eleven genera of loricate choanoflagellates were observed between October 1998 and May 2000 in fixed water samples (lugol's solution + glutaraldehyde) in a JEM 100-SX transmission electron microscope. Most species were recorded in euhaline and mixopolyhaline waters during the spring and summer, none in autumn and a few (four) in winter. The absence of choanoflagellates at the more sheltered inshore stations is due freshwater influence, and at the beach station, probably due the strong wave action. The probably cosmopolitan species Pleurasiga minima, Cosmoeca norvegica, C. ventricosa and Parvicorbicula circularis were present in spring or summer in the estuary channel and coastal area while Stephanoeca diplocostata which apparently prefers lower temperature, was recorded in winter. Calotheca alata and Campyloacantha spinifera are mainly temperate species and were present in spring. The new species Diplotheca tricyclica was recorded at the estuary channel in the summer 1999, in high salinity water.

show abstract

“…Due to the positive rainfall-evaporation water balance in the large watershed area, the larger part of the Patos Lagoon is predominantly fresh to oligohaline, with a high sediment load (Möller et al 1996;Odebrecht et al 2005). The estuarine region, with an area of 900 km 2 , is located in the southernmost part of the Patos Lagoon.…”

Section: Editorialmentioning

confidence: 99%