Climate change does not explain historical changes in the pelagic ecosystem of Lake Kariba (Zambia-Zimbabwe)

2012 ◽  
Vol 17 (4) ◽  
pp. 265-274 ◽  
Author(s):  
Brian E. Marshall
Keyword(s):  
Climate Change ◽  
Pelagic Ecosystem ◽  
Lake Kariba ◽  
Historical Changes

scholarly journals Natural and anthropogenic influences on the Nhecolândia wetlands, SE Pantanal, Brazil

2018 ◽  
Vol 488 (1) ◽  
pp. 167-180 ◽  
Author(s):  
Emiliano Castro de Oliveira ◽  
Sila Pla-Pueyo ◽  
Christopher R. Hackney
Keyword(s):  
Climate Change ◽  
Human Activity ◽  
Human Activities ◽  
Saline Lakes ◽  
Social Aspects ◽  
Anthropogenic Influences ◽  
Historical Changes ◽  
Flood Regime ◽  
Highly Sensitive ◽  
Global And Local

AbstractThe Nhecolândia region covers the southern wetlands of the Pantanal basin in Brazil. Characterized by myriad shallow freshwater and alkaline–saline lakes, the distinct natural features of the Nhecolândia wetland make it highly sensitive to climate change and the effects of human activities. This paper summarizes the natural and social aspects that have affected this delicate wetland and potential future impacts. We analysed the response of the wetland to historical changes in climate and human activity and used this understanding to forecast the response of the wetland to future changes. The data presented here show that this region is particularly sensitive to alterations in the flood regime, droughts and deforestation, which are intrinsically related to both global and local changes in climate and the intensification of cattle-ranching activities, which include deforestation and the introduction of cultivated pastures.

scholarly journals What affects fisheries in African lakes: Climate change or fishing effort? A case study from Lake Kariba

2021 ◽  
Vol 24 (1) ◽  
pp. 5-11
Author(s):  
Brian E. Marshall
Keyword(s):  
Climate Change ◽  
Fishing Effort ◽  
Seasonal Abundance ◽  
Lake Kariba ◽  
African Lakes ◽  
Fishing Vessels ◽  
Air Temperatures ◽  
Phytoplankton Communities ◽  
Warming Rate ◽  
Fish Species Composition

Abstract Lake Kariba, created in 1958, experienced changes, notably the decline of the Limnothrissa miodon fishery, which have been attributed to climatic change. Air temperatures rose abruptly by 1.1°C between 1980 and 1981, but the temperature of the lake did not follow this pattern. Temperatures at 10 m depth increased by 8% between 1961 and 1971, remained stable until 1984, then declined and by 1992 the temperature was about 7% lower than in 1961. The causes of this are unclear but it followed the hot and dry El Niño droughts of 1982-83 and 1991-92. The lake warmed again by 2007-2011 with temperatures at 10 m being about 10% higher than in 1961, while at 40 m it was 16% higher indicating a faster warming rate in deeper waters. The thermocline fell from 15-20 m in 1968 and 1986 to 20-25 m in 2011 and the temperature gradient decreased by > 50%. The epilimnion became more homogenous, with no evidence of anoxia in the upper 20 m in 2007-08, and the normal monomictic thermal regime may change, thus affecting nutrient circulation and the seasonal abundance of plankton. Both zooplankton and phytoplankton communities have evolved since the lake was created, but these changes occurred before any evidence of warming. The fishery has been declining since 1996 but there is no evidence that climate change is responsible; the number of fishing vessels is presently about three times the recommended level and fishing effort is almost certainly the main cause of the problems. All African lakes support fisheries and it is essential to consider fishing, which changes fish species composition, demographics and abundance, characters that could also be affected by climate change.

scholarly journals Assessing the Sensitivity of Small-Scale Fishery Groups to Climate Change in Lake Kariba, Zimbabwe

2017 ◽  
Vol 9 (12) ◽  
pp. 2209 ◽  
Author(s):  
Nobuhle Ndhlovu ◽  
Osamu Saito ◽  
Riyanti Djalante ◽  
Nobuyuki Yagi
Keyword(s):  
Climate Change ◽  
Small Scale ◽  
Lake Kariba
Sign in / Sign up

Export Citation Format

Share Document