Variation of phytoplankton assemblages along the Mozambique coast as revealed by HPLC and microscopy

Sá, Carolina; Leal, Miguel C.; Silva, Alexandra; Nordez, S.; Andre, E; Paula, José; Brotas, Vanda

doi:10.1016/j.seares.2013.01.001

Cited by 18 publications

(20 citation statements)

References 29 publications

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“…In the tropical waters of the western Indian Ocean, the contribution of coccolithophores to total phytoplankton abundance is also important (Sá et al 2013). In the present study, coccolithophores were observed only once in winter (1000 cells L -1 ).…”

Section: Community Composition Of Phytoplanktoncontrasting

confidence: 39%

“…Furthermore, the dominance of chlorophytes < 10 µm as one of the most abundant taxa among flagellates and in general in natural samples was also observed at Puerto Morelos in the Mexican Caribbean (Halac et al 2013). Modern techniques such as HPLC pigment analysis applied recently to the studies of the taxonomic composition of tropical phytoplankton, apart from the groups mentioned above, also suggest the presence of at least some of the following taxonomic groups: Prochlorococcus sp., euglenophytes, prasinophytes, chrysophytes, prymnesiophytes and cryptophytes (Sá et al 2013).…”

Section: Community Composition Of Phytoplanktonmentioning

confidence: 99%

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Annual cycle of phytoplankton with emphasis on potentially harmful species in oyster beds of Términos Lagoon, southeastern Gulf of Mexico

Poot-Delgado

Okolodkov

Aké-Castillo³

et al. 2015

Rev. biol. mar. oceanogr.

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Ciclo anual del fitoplancton con énfasis en las especies potencialmente nocivas en bancos ostrícolas de la laguna de Términos, sureste del Golfo Resumen.-Para definir la composición de la comunidad fitoplanctónica con énfasis en las especies nocivas en los bancos ostrícolas de la laguna de Términos, SE del Golfo de México, 6 sitios de muestreo fueron monitoreados mensualmente desde agosto 2012 a septiembre 2013. Se midió la temperatura del agua, salinidad, potencial de hidró geno, saturación de oxígeno, nutrientes inorgánicos y la abundancia de fitoplancton. La temperatura y la salinidad se caracterizaron por diferencias estacionales marcadas. Los valores de pH y saturación de oxígeno sugirieron un predominio de la actividad fotosintética. La comunidad fitoplanctónica se caracter izó por el predominio de nanoflagelados y dia tomeas. La abundancia de fitoplancton y su variación estacional presentaron los valores mínimos (10 3 células L -1 ) durante la época de secas (febrero-mayo) y valores al tos (10 6 célul as L -1 ) dur ante la temporada de lluvias (junio-septiembre). Otra característica importante de la comunidad fitoplanctónica fue la presencia de especies de dinoflagel ados nocivos: Akashiwo sanguinea, Karenia cf. mikimotoi, Pyrodinium bahamense var. bahamense, Prorocentrum mexicanum y P. minimum. Las cianobacterias Anabaena y Cylindrospermopsis cuspis alcanzaron abundancias de 1.9x10 6 y 1.3x10 6 células L -1 , respecti vamente. Los g éneros Alexandrium y Pseudo-ni tzschia estuvi eron presentes, pero los taxones no fueron identificados a nivel de especie. En conclusión, la comunidad fitoplanctónica se somete a cambios en la composición de especies y en la estructura de la comunidad durante cada temporada climática, en respuesta a la variación ambiental, que permite el desarrollo de la comunidad fitoplanctónica de acuerdo a las condiciones imperantes. Palabras clave: Cambios estacionales, cianobacterias, diatomeas, dinoflagelados, lagunas costerasAbstract.-To define the composition of the phytoplankton community, with an emphasis on harmful species, 6 stations were monitored monthly in the oyster beds of Términos Lagoon, SE Gulf of Mexico, from August 2012 to September 2013. Water temperature, salinity, hydrogen potential, oxygen saturation, inorganic nutrients and abundance of phytoplankton were determined. Temperature and salinity were characterized by marked seasonal differences. The pH values and the oxygen saturation suggest a predominance of photosynthetic activity. The phytoplankton community was characterized by the dominance of nanoflagellates and diatoms. , respectively. The genera Alexandrium and Pseudo-nitzschia were present, but the taxa were not identified to the species level. In conclusion, the phytoplankton community undergoes changes in both species composition and structure of the community during each climatic season, in response to environmental variation, which allows the development of the phytoplankton community according to the conditions. Key words: Seasonal changes, cyanobacteria,...

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Section: Community Composition Of Phytoplanktoncontrasting

confidence: 39%

Section: Community Composition Of Phytoplanktonmentioning

confidence: 99%

Annual cycle of phytoplankton with emphasis on potentially harmful species in oyster beds of Términos Lagoon, southeastern Gulf of Mexico

Poot-Delgado

Okolodkov

Aké-Castillo³

et al. 2015

Rev. biol. mar. oceanogr.

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“…In comparison to the Benguela system, far fewer studies on phytoplankton have been conducted in the Agulhas region (AR), with the majority of investigations focussed on the wider shelf areas of the KwaZulu-Natal (KZN) Bight (28.5-30 °S) and the Delagoa Bight (~24-27 °S). Early studies showed Chla concentrations in Delagoa Bight ranging between 0.6 and 1.26 mg m -3 (Mordasova, 1980), and more recent investigations (Barlow et al 2008;Kyewalyanga et al, 2007;Sá et al, 2013) have illustrated variable phytoplankton distributions in response to changing circulation patterns (Lamont et al, 2010). On the KZN shelf, a wide range of in situ Chla concentrations has been observed (Barlow et al, 2008(Barlow et al, , 2010(Barlow et al, , 2013(Barlow et al, , 2015Burchall, 1968 a, b;Carter and Schleyer, 1988).…”

Section: East Coast Of Southern Africa and Madagascarmentioning

confidence: 99%

“…Located on the east and south coasts of Southern Africa, the Agulhas Current system feeds the upper limb of the Atlantic meridional overturning circulation through the flow of warm, saline surface waters from the Indian Ocean to the Atlantic Ocean (Lutjeharms, 2006). The Agulhas ecosystem and Mozambique Channel are characterised as oligotrophic, where mainly nano-and picophytoplankton dominate in the surface layers further offshore, with microphytoplankton being more important in the shelf regions (Barlow et al, 2010;Sá et al, 2013). Located south of the African continent, the Southern Ocean plays a critical role in regulating the global organic carbon flux and modulates nutrient supply to thermocline waters, which in turn drives productivity in the lower latitudes (Sarmiento et al, 2004;Schlitzer, 2002).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation in remotely-sensed phytoplankton size structure around southern Africa

Lamont

Brewin

Barlow

2018

Remote Sensing of Environment

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The three-component model of Brewin et al. (2010) computes fractional contributions of three phytoplankton size classes (micro-(> 20 m), nano-(2-20 m), picophytoplankton (< 2 m)) to the overall chlorophyll a concentration (Chla). Using in situ pigment data, model coefficients were adjusted for application to the southern African marine region. The refined model was applied to seasonal and monthly climatologies of MODIS Aqua Chla around Southern Africa. Chla > 1 mg m-3 was limited to shelf regions along the coasts of Southern Africa and Madagascar, while values < 0.1 mg-3 were found over most of the open ocean between the equator and 38 °S during austral summer and autumn. In winter and spring, low values (< 0.1 mg m-3) were restricted to smaller regions within subtropical gyres, while values up to 0.7 mg m-3 extended over a much greater area of the open ocean. Shelf regions in the northern (NB) and southern Benguela (SB), Agulhas Bank (AB), Agulhas region (AR), and Mozambique Channel (MC) all showed similar seasonal cycles of size structure. On average, micro-phytoplankton comprised > 50 % of the total Chla in these regions with little change throughout the year. The AR shelf differed, with picophytoplankton dominating in summer, and micro-and nanophytoplankton the rest of the year. In the open ocean domains of the NB, SB, and AB regions, nanophytoplankton dominated for most of the year, with picophytoplankton being more prevalent during summer and autumn. In contrast, in the AR open ocean, nanophytoplankton were dominant only during winter and early spring, whereas picophytoplankton dominated throughout the year in the MC open ocean. The refined model characterised previously unknown spatial and temporal changes in size structure in various ecosystems around Southern Africa.

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“…when values are below 0.5. For the limitation, we focus our analysis on nanophytoplankton because they represent the most abundant plankton community in this region (Sá et al, 2013).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Suppressing and enhancing effects of mesoscale dynamics on biological production in the Mozambique Channel

José

Penven

Aumont

et al. 2016

Journal of Marine Systems

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Variation of phytoplankton assemblages along the Mozambique coast as revealed by HPLC and microscopy

Cited by 18 publications

References 29 publications

Annual cycle of phytoplankton with emphasis on potentially harmful species in oyster beds of Términos Lagoon, southeastern Gulf of Mexico

Annual cycle of phytoplankton with emphasis on potentially harmful species in oyster beds of Términos Lagoon, southeastern Gulf of Mexico

Seasonal variation in remotely-sensed phytoplankton size structure around southern Africa

Suppressing and enhancing effects of mesoscale dynamics on biological production in the Mozambique Channel

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