Climate change in tropical fresh waters (comment on the paper 'Plankton dynamics under different climatic conditions in space and time' by de Senerpont Domis et al.,)

Hugo Preto de Morais Sarmento, A.M. Amado, J.-P. Descy

Research output: Contribution to journalArticle

Abstract

De Senerpont Domis et al. (2013, Freshwater Biology, 58, 463-482) forecasted changes in plankton dynamics in temperate, polar and tropical regions resulting from climate change. For tropical regions, they predicted an increase in precipitation intensity that would increase nutrient loading, increasing phytoplankton biomass and select for plankton adapted to flushing. We do not agree with these predictions, as regional projections from the IPCC did not forecast a major increase in precipitation in tropical regions. The only regions where a slight increase in precipitation was projected were eastern Africa and South-East Asia. In eastern Africa, the major freshwater bodies are large, deep lakes that have very long residence times and are unlikely to be affected by flushing. Moreover, nutrient inputs from their catchment represent a small fraction of their total nutrient loading. Several independent studies carried out in this region have provided evidence of a decrease in primary productivity in some of these large tropical lakes due to climate change. The major process providing nutrients to the euphotic layer is internal loading, which has been reduced as warming of the surface waters has increased the temperature gradient and the water column stability. Moreover, reduced velocity of trade winds during the dry season has affected the mixed layer depth and decreased internal nutrient fluxes. Therefore, the trend for large tropical lakes in a warming climate is oligotrophication, not eutrophication. In tropical South America, the rainfall increase is not the dominant scenario; thus, the predicted changes in plankton dynamics do not stand. Therefore, we believe that the predictions presented in the paper for tropical systems under a changing climate are invalid for most tropical systems.
Original languageEnglish
Pages (from-to)2208-2210
Number of pages3
JournalFreshwater Biology
Volume58
Issue number10
DOIs
Publication statusPublished - 1 Oct 2013

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space and time
plankton
tropics
climate change
pollution load
Eastern Africa
lakes
tropical region
nutrient
nutrients
trade winds
Polar Regions
flushing
prediction
lake
South East Asia
temperature profiles
water
warming
global warming

Cite this

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title = "Climate change in tropical fresh waters (comment on the paper 'Plankton dynamics under different climatic conditions in space and time' by de Senerpont Domis et al.,)",
abstract = "De Senerpont Domis et al. (2013, Freshwater Biology, 58, 463-482) forecasted changes in plankton dynamics in temperate, polar and tropical regions resulting from climate change. For tropical regions, they predicted an increase in precipitation intensity that would increase nutrient loading, increasing phytoplankton biomass and select for plankton adapted to flushing. We do not agree with these predictions, as regional projections from the IPCC did not forecast a major increase in precipitation in tropical regions. The only regions where a slight increase in precipitation was projected were eastern Africa and South-East Asia. In eastern Africa, the major freshwater bodies are large, deep lakes that have very long residence times and are unlikely to be affected by flushing. Moreover, nutrient inputs from their catchment represent a small fraction of their total nutrient loading. Several independent studies carried out in this region have provided evidence of a decrease in primary productivity in some of these large tropical lakes due to climate change. The major process providing nutrients to the euphotic layer is internal loading, which has been reduced as warming of the surface waters has increased the temperature gradient and the water column stability. Moreover, reduced velocity of trade winds during the dry season has affected the mixed layer depth and decreased internal nutrient fluxes. Therefore, the trend for large tropical lakes in a warming climate is oligotrophication, not eutrophication. In tropical South America, the rainfall increase is not the dominant scenario; thus, the predicted changes in plankton dynamics do not stand. Therefore, we believe that the predictions presented in the paper for tropical systems under a changing climate are invalid for most tropical systems.",
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Climate change in tropical fresh waters (comment on the paper 'Plankton dynamics under different climatic conditions in space and time' by de Senerpont Domis et al.,). / Preto de Morais Sarmento, Hugo; Amado, A.M.; Descy, J.-P.

In: Freshwater Biology, Vol. 58, No. 10, 01.10.2013, p. 2208-2210.

Research output: Contribution to journalArticle

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T1 - Climate change in tropical fresh waters (comment on the paper 'Plankton dynamics under different climatic conditions in space and time' by de Senerpont Domis et al.,)

AU - Preto de Morais Sarmento, Hugo

AU - Amado, A.M.

AU - Descy, J.-P.

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