Status of Kigezi minor Lakes: A limnological survey in the Lakes of Kisoro, Kabale and Rukungiri Districts

Abstract

A limnological survey was conducted in six Lakes: Mulehe, Mutanda, Kayumbu, Chahafi, Bunyonyi and Nakasanda, of South-Western Uganda (SWU) in September 2014. The baseline survey aimed at characterizing the high altitude water bodies for enhanced future fisheries productivity. The results indicated that Lake Nakasanda had the highest temperature (24°C). Although other physic-chemical conditions of the water bodies varied, they were within acceptable ranges for fish productivity with no extreme cases reported. Chlorophyll-a was recorded highest in Lakes Nakasanda (16.8±3.4 µgL -1 ) and Bunyonyi (14.2±9.5 µgL -1 ). Rotifers were the most dominant zooplankton taxa with a total of 16 species and Lake Mulehe had the highest abundance (2,089,423±4,511 individuals m -2 ) while the least abundance were recorded in Lakes Nakasanda (471,608±35,505 individuals m -2 ) and Chahafi (473,354±15,279 individuals m -2). Among the macro-invertebrates, Diptera was the most abundant with Lake Mutanda recording the highest species richness of 8. The recorded absence or fewer individuals of some zooplankton and macro-invertebrate species/groups in certain aquatic ecosystems were attributed to the water quality. The variation in water quality, results from human activities and this may impart negative implications on fish productivity if not remedied.

Climate-smart water management practices for sustainable agriculture in Uganda

“…In addition, vegetation that had previously shielded Lake Mutanda against erosion, as well as its effects were removed to make way for farming and the establishment of tourist campsites. Additionally, due to soil erosion from farming activities near the lake, seasonal rainfall variability, such as fluctuations in precipitation, has increased turbidity in its waters (Tibihika et al 2016). The authors also failed to raise awareness of the value of vegetation and how environmentally friendly management of land can encourage local neighborhoods and other interested parties to actively participate in preserving the ecosystem of the lake while preserving water quality for the well-being of current and future generations.…”