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      Benthic diatoms as indicators of eutrophication in tropical streams

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      Hydrobiologia
      Springer Nature

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          Climate change decreases aquatic ecosystem productivity of Lake Tanganyika, Africa.

          Although the effects of climate warming on the chemical and physical properties of lakes have been documented, biotic and ecosystem-scale responses to climate change have been only estimated or predicted by manipulations and models. Here we present evidence that climate warming is diminishing productivity in Lake Tanganyika, East Africa. This lake has historically supported a highly productive pelagic fishery that currently provides 25-40% of the animal protein supply for the populations of the surrounding countries. In parallel with regional warming patterns since the beginning of the twentieth century, a rise in surface-water temperature has increased the stability of the water column. A regional decrease in wind velocity has contributed to reduced mixing, decreasing deep-water nutrient upwelling and entrainment into surface waters. Carbon isotope records in sediment cores suggest that primary productivity may have decreased by about 20%, implying a roughly 30% decrease in fish yields. Our study provides evidence that the impact of regional effects of global climate change on aquatic ecosystem functions and services can be larger than that of local anthropogenic activity or overfishing.
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            Developments in Stream Ecosystem Theory

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              Ecological consequences of a century of warming in Lake Tanganyika.

              Deep tropical lakes are excellent climate monitors because annual mixing is shallow and flushing rates are low, allowing heat to accumulate during climatic warming. We describe effects of warming on Lake Tanganyika: A sharpened density gradient has slowed vertical mixing and reduced primary production. Increased warming rates during the coming century may continue to slow mixing and further reduce productivity in Lake Tanganyika and other deep tropical lakes.
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                Author and article information

                Journal
                Hydrobiologia
                Hydrobiologia
                Springer Nature
                0018-8158
                1573-5117
                December 2006
                September 30 2006
                December 2006
                : 573
                : 1
                : 75-87
                Article
                10.1007/s10750-006-0262-5
                d5a1f98e-c0b0-44a6-816d-a56cff957575
                © 2006
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