Temporal and spatial dynamics of zooplankton in relation to phytoplankton in Lake Babogaya (Bishoftu guda), Ethiopia.

No Thumbnail Available



Journal Title

Journal ISSN

Volume Title


Addis Ababa University


The zooplankton of a crater lake in Ethiopia, Babogaya, was sampled at 3 stations from June 2006 to April 2007 concurrently with phytoplankton numerical abundance. The spatial and temporal variation in abundance of the dominant crustaceans, Rotifera, Copepoda and Cladocera is discussed. Temporal (months, sampling dates) variation was larger than spatial (station) variation for the mean total zooplankton. All major zooplankton groups showed temporal variations in abundance, with highest densities during wet (June to August) and mixing period (November to January), minimum densities after the end of the big rain in October. Rotifers were the dominant group and made up almost 71% of the total zooplankton abundance. Rotifers showed a maximum density during the dry period and declined after the end of the big rains. Copepods and cladocerans also contributed 23% and 6%, respectively, of the major total zooplankton abundance of the lake. The maximum vertical distribution of total zooplankton was observed at the metalimnon region. The phytoplankton community was dominated by dinoflagllates during the dry season and there was a shift in dominance to diatoms during the long rainy period. The dominant phytoplankton showed distinct seasonality. This study is believed to give a baseline for further research on zooplankton seasonal variation and production that helps in the understanding of fish production and proper management in the study lake. Key words: Lake Babogaya, zooplankton, phytoplankton, temporal dynamics, vertical migration.



Lake Babogaya, zooplankton, phytoplankton, temporal dynamics, vertical migration