Dynamics of phytoplankton communities during late summer around the tip of the Antarctic Peninsula

Mendes, Carlos; Souza, Márcio Silva de; Tavano, Virgínia Maria; Leal, Miguel C.; Brotas, Vanda; Garcia, Carlos Alberto Eiras

doi:10.1016/j.dsr.2012.03.002

Cited by 86 publications

(91 citation statements)

References 51 publications

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“…Two other studies of phytoplankton recognized the pattern of high chl a close to the SSI, lower in the Drake Passage and near the continental shelf influenced by Weddell Sea water, and they found differences in the communities (Olguin & Alder 2011, Mendes et al 2012. Mendes et al (2012) concluded that water column stability (i.e. Z UML ) determined phytoplankton community structure.…”

Section: Comparison Of Community Structure and Environment In Three Dmentioning

confidence: 99%

“…Kang et al (2001) divided the area into 2 regions -the Weddell Sea and the Bransfield Strait region -based on differences in the phytoplankton communities and Z UML , which was generally deep in the Weddell Sea water. Two other studies of phytoplankton recognized the pattern of high chl a close to the SSI, lower in the Drake Passage and near the continental shelf influenced by Weddell Sea water, and they found differences in the communities (Olguin & Alder 2011, Mendes et al 2012. Mendes et al (2012) concluded that water column stability (i.e.…”

Section: Comparison Of Community Structure and Environment In Three Dmentioning

confidence: 99%

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Microbial biogeography during austral summer 2007 in the surface waters around the South Shetland Islands, Antarctica

Olsen¹,

Ardelan²,

Hewes³

et al. 2013

Aquat. Microb. Ecol.

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Recent studies have concluded that different water bodies in the ocean can contain different microbial communities. The goal of the present study was to determine if biogeographic patterns are present for aquatic microbes in waters which meet around the South Shetland Islands (SSI), Antarctica. Prokaryotic and eukaryotic marine microbial communities were monitored during the 2007 austral summer by use of polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE) of small subunit ribosomal DNA. Hydrographic properties, nutrients and chlorophyll a were also measured. There was an onshore to offshore gradient in temperature, salinity and iron concentration and a unimodal distribution of chlorophyll a concentration in relation to the middle of this gradient that occurred near the SSI. The differences in microbial community structure among stations in the studied area were correlated with both geographical distance and environmental factors. For eukaryotes, the correlation was strongest for environment, whereas it was strongest for geographical distance for the prokaryotes. Eukaryotic and prokaryotic community structures were highly correlated. Surface water from the Weddell Sea had a different community of eukaryotes than the water in the Antarctic Circumpolar Current in the Drake Passage, whereas the prokaryotic community was not significantly different. The area close to the SSI where the 2 water types mix had the highest chlorophyll concentration and significantly different communities of eukaryotes and prokaryotes from both of the inflowing water types. These results suggest that the prokaryote community structure was more affected by productivity than by environmental variables. KEY WORDS: Microbial biogeography · Microbial community · Natural iron enrichment · Southern OceanResale or republication not permitted without written consent of the publisher

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Section: Comparison Of Community Structure and Environment In Three Dmentioning

confidence: 99%

Section: Comparison Of Community Structure and Environment In Three Dmentioning

confidence: 99%

Microbial biogeography during austral summer 2007 in the surface waters around the South Shetland Islands, Antarctica

Olsen¹,

Ardelan²,

Hewes³

et al. 2013

Aquat. Microb. Ecol.

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“…Geider et al 1998). However, chl a and phytoplankton carbon are well correlated in the Southern Ocean (Arrigo et al 2008) and the northern WAP (Mendes et al 2012). In phytoplankton, fucoxanthin is confined to diatoms, prymnesiophytes (such as Phaeocystis spp.…”

Section: In Situ Datamentioning

confidence: 99%

Effect of continental shelf canyons on phytoplankton biomass and community composition along the western Antarctic Peninsula

Kavanaugh¹,

Abdala²,

Ducklow³

et al. 2015

Mar. Ecol. Prog. Ser.

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“…These re-arrangements were adopted for showing the average contribution of those major phytoplankton groups in the study area. Moreover, given that the degradation products of Chl a (Pheophorbide a, Pheophytin a and Chlorophyllide a) can be related to zooplankton grazing and/or senescence (Jeffrey et al, 1997;Mendes et al, 2012), we have obtained the relative concentration of degradation products (based on the average for all stations per cruise) in relation to the total Chl a (Chl-a þ degradation products).…”

Section: Water Mass Spring Summermentioning

confidence: 99%

“…Chlorophyll a (Chl a) concentration data from HPLC analysis were used as a phytoplankton biomass index, since this photosynthetic pigment is common to all autotrophic phytoplankton. In addition, the proportion of pheopigments a (Pheophytin aþ Pheophorbide a/Chl a þPheopigments a) was determined, since those pigments can be related to degradation of Chl a due to grazing by zooplankton (Jeffrey et al, 1997;Mendes et al, 2012). The relative abundance of phytoplankton contributing to total Chl a biomass was calculated from pigment data using version 1.95 of CHEMTAX software (Mackey et al, 1996).…”

Section: Water Mass Spring Summermentioning

confidence: 99%

Seasonal change of phytoplankton (spring vs. summer) in the southern Patagonian shelf

Gonçalves-Araujo

Souza

Mendes

et al. 2016

Continental Shelf Research

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a b s t r a c tAs part of the Patagonian Experiment (PATEX) project two sequential seasons (spring/summer 2007-2008) were sampled in the southern Patagonian shelf, when physical-chemical-biological (phytoplankton) data were collected. Phytoplankton biomass and community composition were assessed through both microscopic and high-performance liquid chromatography/chemical taxonomy (HPLC/ CHEMTAX) techniques and related to both in situ and satellite data at spatial and seasonal scales. Phytoplankton seasonal variation was clearly modulated by water column thermohaline structure and nutrient dynamics [mainly dissolved inorganic nitrogen (DIN) and silicate]. The spring phytoplankton community showed elevated biomass and was dominated by diatoms [mainly Corethron pennatum and small ( o20 mm) cells of Thalassiosira spp.], associated with a deeper and more weakly stratified upper mixed layer depth (UMLD) and relatively low nutrient concentrations, which were probably a result of consumption by the diatom bloom. In contrast, the phytoplankton community in summer presented lower biomass and was mainly dominated by haptophytes (primarily Emiliania huxleyi and Phaeocystis antarctica) and dinoflagellates, associated with shallower and well-stratified upper mixed layers with higher nutrient concentrations, likely due to lateral advection of nutrient-rich waters from the Malvinas Current. The gradual establishment of a strongly stratified and shallow UMLD as season progressed, was an important factor leading to the replacement of the spring diatom community by a dominance of calcifying organisms, as shown in remote sensing imagery and confirmed by microscopic examination. Furthermore, in spring, phaeopigments a (degradation products of chlorophyll a) relative to chlorophyll a, were twice that of summer, indicating the diatom bloom was under higher grazing pressure.

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Dynamics of phytoplankton communities during late summer around the tip of the Antarctic Peninsula

Cited by 86 publications

References 51 publications

Microbial biogeography during austral summer 2007 in the surface waters around the South Shetland Islands, Antarctica

Microbial biogeography during austral summer 2007 in the surface waters around the South Shetland Islands, Antarctica

Effect of continental shelf canyons on phytoplankton biomass and community composition along the western Antarctic Peninsula

Seasonal change of phytoplankton (spring vs. summer) in the southern Patagonian shelf

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