Phytoplankton pigment analysis as a tool for monitoring a tropical great lake, Lake Kivu (East Africa)
Rattachement africain : Rwanda, be. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Lake Kivu, East Africa, is a deep oligotrophic and meromictic lake containing high amounts of dissolved methane (∼55–60 km3) and carbon dioxide (∼300 km3) in its deep waters. Methane harvesting for energy production began in 2015, and a monitoring programme was set up to assess possible disturbance on the ecosystem. Phytoplankton biomass and composition was assessed twice per month or monthly at 2 monitoring sites between June 2005 and December 2019, based on HPLC analysis of chlorophyll a (Chl-a) and marker pigments. This long-term series shows that significant changes occurred around 2010 in the lake phytoplankton, with a notable increase of Chl-a and changes in the assemblage toward an increase in non-motile green algae and diatoms. To assess possible changes due to methane harvesting, we compared 2 periods, 2012–2014 and 2018–2019. Chl-a concentration decreased slightly in 2018–2019 compared to the reference period of 2012–2014, and significant changes occurred in composition of the phytoplankton assemblage. In terms of relative contribution to Chl-a, diatoms increased from 26% to 46%, whereas green algae decreased ∼2-fold, from 35% in 2012–2014 to 18% in 2018–2019. Multivariate analyses showed that phytoplankton composition was influenced by seasonal and interannual variations of limnological variables related to changes in meteorological factors. To assess possible future changes due to methane exploitation, we recommend increasing sampling frequency and taxonomic resolution, as well as improving environmental data acquisition.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Phytoplankton pigment analysis as a tool for monitoring a tropical great lake, Lake Kivu (East Africa)
- Date Crossref
- 03/04/2021
- Éditeur
- Informa UK Limited
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Rwanda Development Board Rwanda (code pays fourni par la source)Organisme public
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Vrije Universiteit Brussel Department of Hydrology and Hydraulic Engineering pays non établi dans la noticeUniversité ou école supérieure
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Service Public de Wallonie pays non établi dans la noticeOrganisme public
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University of Namur Research Unit in Environmental and Evolutionary Biology pays non établi dans la noticeUniversité ou école supérieure
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University of Liège Unit of Chemical Oceanography pays non établi dans la noticeUniversité ou école supérieure
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Lake Kivu Monitoring Program Rwanda (pays nommé en fin d’affiliation)Institution
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DEMNA pays non établi dans la noticeInstitution
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Shema Power Lake Kivu Ltd Kigali, Rwanda (pays nommé en fin d’affiliation)Entreprise
Rwanda Development Board (Rwanda), Department of Hydrology and Hydraulic Engineering — Vrije Universiteit Brussel et Service Public de Wallonie, avec 5 autres affiliations. Pays d’affiliation : Rwanda.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.