Seasonal Variation of Microalgae Diversity in Lake Abaya, Ethiopia

Aquatic environments are subject to high temporal variability, with frequent reorganization of the relative abundance and species composition of phytoplankton as a result of the interactions between physical, chemical and biological variables [1]. The microalgae community in a lake may vary both spatially and temporally [2]. The reduction in numbers or change in species composition of microalgae could lead to a reduction in zooplankton abundance [3]. Suggest that a number of factors limit microalgae growth in lakes and reservoirs. Factors such as water level, meteorological factors like solar radiation, photoperiod, rainfall, wind velocity, etc., and hydrological conditions (inflows and outflows) have great influence on the rate of primary production in lacustrine and flowing waters. The fertilizers applied on the agricultural lands with a view to boost crop yield eventually find their ways into nearby water bodies and pollute them [4]. There are numerous descriptions of the seasonal periodicity of microalgae communities and the possible factors controlling their periodic changes in fresh water lakes [3]. The diversity of a phytoplankton community can be used to characterize its structure. This structure is determined by the number of species present, their physiological properties and by the genetic potential of the organisms making up the community [5]. The seasonal fluctuations in microalgae abundance and species composition in any Research Article Volume 2 Issue 5 Received Date: July 20, 2018 Published Date: August 09, 2018 International Journal of Oceanography & Aquaculture Damtew Etisa, et al. Seasonal Variation of Microalgae Diversity in Lake Abaya, Ethiopia. Int J Oceanogr Aquac 2018, 2(5): 000150. Copyright© Damtew Etisa, et al. 2 water body is due to differential response of different species to changing levels of light, temperature, nutrients, grazing pressure, onset of parasitic infection, extracellular metabolites of plants and animals with a change in season during a course of year [6]. As demonstrate microalgae productivity follows essentially the same pattern in turbid as in clear waters except that the productivity profiles are compressed, due to the rapid attenuation of light. Blooms of blue-green algae are favored by the high temperature of the warmer months of the year [7,8].