Development of phytoplankton communities: Implications of nutrient injections on phytoplankton composition, pH and ecosystem production

Jakobsen, Hans Henrik; Blanda, Elisa; Stæhr, Peter A.; Højgård, Jacob K.; Rayner, Thomas Allan; Pedersen, Morten Foldager; Jepsen, Per Meyer; Hansen, Benni Winding

doi:10.1016/j.jembe.2015.08.011

Cited by 44 publications

(12 citation statements)

References 35 publications

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“…In order to demonstrate the applicability of the developed LC-MS/MS method for the detection of GD in the field, plankton samples of an expedition into Danish waters (Fig. 2) were analysed where potentially GD-producing A. pseudogonyaulax had been reported before (Jakobsen et al, 2015). GDA was detected at many stations throughout the entire transect with the highest GDA abundances in Limfjord, which connects the North Sea in the west with the Kattegat in the east.…”

Section: Discussionmentioning

confidence: 99%

Development of a LC-MS/MS method for the quantification of goniodomins A and B and its application to Alexandrium pseudogonyaulax strains and plankton field samples of Danish coastal waters

Krock

Tillmann

Wen

et al. 2018

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the author's institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/authorsrights Contents lists available at ScienceDirect Toxicon

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Section: Discussionmentioning

confidence: 99%

Development of a LC-MS/MS method for the quantification of goniodomins A and B and its application to Alexandrium pseudogonyaulax strains and plankton field samples of Danish coastal waters

Krock

Tillmann

Wen

et al. 2018

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“…A combination of nitrate (NO 3 ), ammonium (NH 3 ) and phosphate (PO 4 ) was added to eight mesocosms on the first day of the experiment on 20 January 2015 (Table ). The desired final nitrogen levels were determined from experiences obtained in other studies (Jakobsen et al., ; Staehr & Sand‐Jensen, ). The PO 4 level was chosen to be at the similar level as that observed in a eutrophic reservoir in Minas Gerais (Brandão, Staehr, & Bezerra‐Neto, ).…”

Section: Methodsmentioning

confidence: 99%

Importance of nutrients, organic matter and light availability on epilimnetic metabolic rates in a mesotrophic tropical lake

et al. 2018

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Global changes, such as climate and land use alterations, are expected to affect freshwater ecosystems, modifying environmental conditions with ultimate effects on carbon and nutrient cycling. While effects of these changes have been the focus of several studies in temperate lakes, remarkably little effort has been dedicated to understanding the behaviour and responses of tropical lakes despite their importance in tropical environments. In a factorial mesocosm study conducted in a tropical lake, we investigated how changes in environmental conditions, such as additions of inorganic nutrients and allochthonous organic matter, and shading, affect gross primary production (GPP), community respiration (R) and net community production (NCP) rates, and the occurrence of GPP light saturation and photoinhibition. GPP rates in the mesocosms were enhanced by additions of inorganic nutrients (+NP) and organic matter (+C) and decreased with increasing mean light available (Ī). Apparent photoinhibition was pronounced in full light treatments (+L) without additions of nutrients (−NP) and organic matter (−C), occurring in 91% of the experimental days. This supports previous evidence of the importance of photoinhibition in the upper mixed layer of the lake, especially during nutrient depletion and high light availability in the warmer rainy season. The main factor affecting metabolic rates was nutrients (NP), followed by organic matter (C). Effect of light (L) and the interaction between C and L were also significant for GPP and R rates. Addition of allochthonous organic matter (+C) with a high content of coloured dissolved organic matter (CDOM) stimulated GPP rates and reduced the occurrence of apparent photoinhibition and light saturation. This also increased R rates in the mesocosms. However, R was strongly coupled to GPP, indicating that changes in respiration were more related to autotrophic activity than to a direct and independent stimulation of heterotrophic communities. Our results strongly support recent evidence of the interactions between nutrients, organic matter and light conditions, which under a scenario of changes in the frequency and intensity of precipitation events and human‐mediated changes in land use, may affect the magnitude, variability and balance of metabolic processes in the productive upper mixed layers of tropical lakes.

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“…Recent alterations in environmental conditions, principally caused by human activities, have rendered this goal more pressing since a better understanding of ecological processes is necessary to improve our ability to detect and predict the impact of future changes [1,2]. The majority of experimental work on the effects of both climate [3][4][5] and non-climate [6,7] stressors on multi-species assemblages has been conducted under controlled conditions, in mesocosm systems for example, where environmental variables can be manipulated more readily. The choice of target organism(s) in controlled experiments is, however, heavily prejudiced by the investigator and rarely represents natural or complete communities, while tightly-controlled ecological experiments may also suffer from artificiality [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Community responses to seawater warming are conserved across diverse biological groupings and taxonomic resolutions

et al. 2017

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Temperature variability is a major driver of ecological pattern, with recent changes in average and extreme temperatures having significant impacts on populations, communities and ecosystems. In the marine realm, very few experiments have manipulated temperature in situ, and current understanding of temperature effects on community dynamics is limited. We developed new technology for precise seawater temperature control to examine warming effects on communities of bacteria, microbial eukaryotes (protists) and metazoans. Despite highly contrasting phylogenies, size spectra and diversity levels, the three community types responded similarly to seawater warming treatments of +3°C and +5°C, highlighting the critical and overarching importance of temperature in structuring communities. Temperature effects were detectable at coarse taxonomic resolutions and many taxa responded positively to warming, leading to increased abundances at the community-level. Novel field-based experimental approaches are essential to improve mechanistic understanding of how ocean warming will alter the structure and functioning of diverse marine communities.

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Development of phytoplankton communities: Implications of nutrient injections on phytoplankton composition, pH and ecosystem production

Cited by 44 publications

References 35 publications

Development of a LC-MS/MS method for the quantification of goniodomins A and B and its application to Alexandrium pseudogonyaulax strains and plankton field samples of Danish coastal waters

Development of a LC-MS/MS method for the quantification of goniodomins A and B and its application to Alexandrium pseudogonyaulax strains and plankton field samples of Danish coastal waters

Importance of nutrients, organic matter and light availability on epilimnetic metabolic rates in a mesotrophic tropical lake

Community responses to seawater warming are conserved across diverse biological groupings and taxonomic resolutions

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