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Browsing by Subject "Phytoplankton"

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Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa

Author: Oberholster, Paul J ; Botha, AM ; Ashton, PJ Date: Apr 2009 Data generated during 12 field trips in 2006 were used to investigate possible changes in the biota communities of Lake Tswaing after a borehole was sunk in 1988/1989 near the centre of the crater lake. The Tswaing meteorite crater lake is a ... Read more
Characterizing the absorption properties for remote sensing of three small optically-diverse South African reservoirs

Author: Matthews, MW ; Bernard, Stewart Date: Sep 2013 Characterizing the specific inherent optical properties (SIOPs) of water constituents is fundamental to remote sensing applications. Therefore, this paper presents the absorption properties of phytoplankton, gelbstoff and tripton for three ... Read more
Comparative assessment of two agriculturally-influenced estuaries

Author: Lemley, DA ; Adams, JB ; Taljaard, Susan Date: Apr 2017 This study compared the spatio-temporal dynamics in two agriculturally-influenced South African estuaries - Gamtoos and Sundays - to investigate how contrasting hydrological alterations influence physical, chemical and biological responses. ... Read more
High flow variability and storm events shape the ecology of the Mbhashe Estuary, South Africa

Author: James, NC ; Adams, JB ; Connell, AD ; Lamberth, SJ ; MacKay, CF ; Snow, GC ; Van Niekerk, Lara ; Whitfield, AK Date: Mar 2020 The possible impacts of extreme events on the ecology of selected aquatic biota within the Mbhashe Estuary were investigated during a four year (2010–2013) spring sampling programme. During periods of low to average flow conditions the estuary ... Read more
High latitude Southern Ocean phytoplankton have distinctive bio-optical properties

Author: Robinson, CM ; Huot, Y ; Schuback, N ; Ryan-Keogh, Thomas J ; Thomalla, Sandy J ; Antoine, D Date: Jul 2021 Studying the biogeochemistry of the Southern Ocean using remote sensing relies on accurate interpretation of ocean colour through bio-optical and biogeochemical relationships between quantities and properties of interest. During the Antarctic ... Read more
Ineffective artificial mouth-breaching practices and altered hydrology confound eutrophic symptoms in a temporarily closed estuary

Author: Nel, M ; Adams, JB ; Human, LRD ; Nunes, M ; Van Niekerk, Lara ; Lemley, DA Date: Dec 2023 Context: Artificial breaching of intermittently closed estuaries has become more frequent in the face of global-change pressures. Aims: This study aimed to determine whether the ecological health of the Great Brak Estuary has been affected ... Read more
Linking small-scale circulation dynamics with large-scale seasonal production (phytoplankton) in the Southern Ocean

Author: Nicholson, Sarah-Anne Date: Oct 2012 Understanding the seasonal and intra-seasonal (daily to weekly) changes of the upper ocean and the impact on the primary production in the Southern Ocean is key to better understanding the sensitivities of the global carbon cycle. Read more
Nitrogen uptake by phytoplankton in the Atlantic sector of the Southern Ocean during late austral summer

Author: Joubert, WR ; Thomalla, Sandy J ; Waldron, HN ; Lucas, MI ; Boye, M ; Le Moigne, FAC ; Planchon, F ; Speich, S Date: 2011 As part of the Bonus-GoodHope (BGH) campaign, 15N-labelled nitrate, ammonium and urea uptake measurements were made along the BGH transect from Cape Town to ~60° S in late austral summer, 2008. Our results are categorised according to distinct ... Read more
Phenology and environmental control of phytoplankton blooms in the Kong Håkon VII Hav in the Southern Ocean

Author: Kauko, HM ; Hattermann, T ; Ryan-Keogh, Thomas J ; Singh, Asmita ; De Steur, L ; Fransson, A ; Chierici, M ; Falkenhaug, T ; Hallfredsson, EH ; Bratbak, G Date: Mar 2021 Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem ... Read more
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean

Author: Kauko, HM ; Hattermann, T ; Ryan-Keogh, Thomas J ; Singh, Asmita ; De Steur, L ; Fransson, A ; Chierici, M ; Falkenhaug, T ; Hallfredsson, EH ; Bratbak, G Date: Mar 2021 Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem ... Read more
Phytoplankton distribution and nitrogen dynamics in the southwest indian subtropical gyre and Southern Ocean waters

Author: Thomalla, Sandy J ; Waldron, HN ; Lucas, MI ; Read, JF ; Ansorge, IJ ; Pakhomov, E Date: 2010 During the 1999 Marion Island Oceanographic Survey (MIOS 4) in late austral summer, a northbound and reciprocal southbound transect were taken along the Southwest Indian and Madagascar Ridge, between the Prince Edward Islands and 31° S. The ... Read more
Responses of selected biota after biostimulation of a vegetable oil spill in the Con Joubert Bird Sanctuary wetland: a pilot study

Author: Selala, MC ; Oberholster, Paul J ; Surridge, KAK ; De Klerk, Arno R ; Botha, A-M Date: Jan 2013 An investigation on the effect of a vegetable oil spill was conducted on the biological diversity of the Con Joubert Bird Sanctuary wetland in South Africa before and after biostimulation with different concentrations of fertilizer during ... Read more
Satellite ocean colour: Current status and future perspective

Author: Groom, S ; Sathyendranath, S ; Ban, Y ; Bernard, Stewart ; Brewin, R ; Brotas, V ; Brockman, C ; Chauhan, P ; Choi, JK ; Smith, Marie E Date: Aug 2019 Spectrally resolved water-leaving radiances (ocean colour) and inferred chlorophyll concentration are key to studying phytoplankton dynamics at seasonal and inter-annual scales, for a better understanding of the role of phytoplankton in marine ... Read more
Single-turnover variable chlorophyll fluorescence as a tool for assessing phytoplankton photosynthesis and primary productivity: Opportunities, caveats and recommendations

Author: Schuback, N ; Tortell, PD ; Berman-Frank, I ; Campbell, DA ; Ciotti, A ; Courtecuisse, E ; Erickson, ZK ; Fujiki, T ; Ryan-Keogh, Thomas J ; Thomalla, Sandy J Date: Jul 2021 Phytoplankton photosynthetic physiology can be investigated through single-turnover variable chlorophyll fluorescence (ST-ChlF) approaches, which carry unique potential to autonomously collect data at high spatial and temporal resolution. ... Read more
South African diatom collection - a future for historic data [Presented at the Phycological society for Southern Africa Conference]

Author: Van der Molen, J Date: Jan 2008 Diatoms are an important group of micro algae occurring in marine, estuarine and freshwater habitats as phytoplankton and phytobenthos. The species composition at any given time and place is indicative of the prevailing environmental conditions ... Read more
South African diatom collection - a future for historic data [SAMSS 2008]

Author: Van der Molen, J Date: Jul 2008 Diatoms are an important group of micro algae occurring in marine, estuarine and freshwater habitats as phytoplankton and phytobenthos. The species composition at any given time and place is indicative of the prevailing environmental conditions ... Read more
Using a two-layered sphere model to investigate the impact of gas vacuoles on the inherent optical properties of Microcystis aeruginosa

Author: Matthews, MW ; Bernard, Stewart Date: 2013 A two-layered sphere model is used to investigate the impact of gas vacuoles on the inherent optical properties (IOPs) of the cyanophyte Microcystis aeruginosa. Enclosing a vacuole-like particle within a chromatoplasm shell layer significantly ... Read more
Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect)

Author: Cloete, R ; Loock, JC ; Van Horsten, Natasha R ; Fietz, S ; Mtshali, Thato N ; Planquette, H ; Roychoudhury, AN Date: Jul 2021 Winter distributions of dissolved cadmium (dCd) and particulate cadmium (pCd) were measured for the first time in the Indian sector of the Southern Ocean thereby contributing a unique spatial and seasonal dataset. Seven depth profiles, between ... Read more

Now showing items 1-18 of 18

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