Algae as indicator to assess trophic status in Duhok Lake, Kurdistan region of Iraq

Janan Jabbar
2019 Evaluation Study of Three Diagnostic Methods for Helicobacter pylori Infection  
Introduction Algae form the main source of food and oxygen for consumer organis ms in water habitats, directly affect primary production by forming base level of food chain. And also, it is concluded that the algae have main role in assessing water contamination and clean ing waste water (Bhatt et al. 1999) . Algae are one of the more important bio indicators of water quality changes due to their short life spans, speed response to contaminant and easy to determine their nu mbers (Plafkin et
more » ... , 1989) .Various methods used to classification the lakes and determined the trophic status, the most commonly way depended on productivity by using algae related to trophic state index (Bhatt et al. 1999) . Recognition of variances in the quality and quantity of p lankton in lakes contributed to the origin of the trophic system of lake classification. These have been mainly related with the phytoplankton and include the use of a variety of indices and quotients. This field has been developed mainly by European researchers with, as yet, little uses to the waters of North A merica (Chandrashekar et al., 2014) . The-trophic status of water bodies is an important aspect in find ing out the water quality. The trophic status means to the level of production in a Lakes as calculated by many factors such as algal co mposition, and chlo rophyll a (Chandrashekar et al., 2014) . The chlorophyll-a concentration (hereafter referred to as Chl-a) is an important parameter in evaluating water quality, nutrit ion status and organic pollution extent, provid ing useful in formation for managing water quality ( Scherz,1972) and monitoring water pollution ( Johson and Harris,1980).Palmer (1 969) also demonstrated that algal assemblages may be used as indicators of clean or contaminated water, similarly My xophycean and Chlorophycean forms have been reported to reflect specific state of aquatic habitats on the basis of Nygaard's indices. The main aim of this investigation to determine the trophic status in Duhok lake depending on variation of algae and application some index to determination its quality. Abstract In present study, algal groups which are used as indicator to trophic and pollution status of Duhok lake. Data that applied for Nygaard's indices, dominant genus scores, Chlorophyll a and Palmer's index of pollution, were collected from only previous study happened for Duhok lake during 2002. Total 250 algal taxa which have classified into 6 taxonomic groups were identified. Diatoms members constituted the dominant phytoplankton group in terms of species number, out of 115 identified taxa of diatoms; only seven centric taxa were identified. The Nygaard's compound index value and composition of phytoplankton indicate that the trophic state of Duhok Dam Lake was eutrophic. The trophic state indices of Myxophycean and Chlorophycean in this survey is indicating Eutrophic nature of lake water and the trophic state indices of Diatoms and Euglenophycean indicate oligotrophic nature of water. As a result of dominant genus scores was (5.7), the lake has a mesotrophic-eutrophic character according to trophic level, in addition, the water quality of Lake Duhok was moderate and moderate polluted in 2002. According to concentration of Chlorophyll-a never fell below (15µgchl a l-1) and was eutrophic status. The most pollution tolerant species of Euglena, Phacus, Phormidium, Oscillatoria, S cenedesmus, Pandorina, Chlamydomonas, Closterium and Nitzschia identified in lake. These genus are tolerant to pollution depending to Palmer (1969) . This communities of algae indicate to that reservoir was highly polluted by organic matter. The total score of Algal genus pollution index was 37 in Duhok lake that indicates to confirm high organic pollution and was eutrophic state.
doi:10.24271/garmian.scpas12 fatcat:2r2bxseqbnd3jhzc4i6c6oa7ky