Ecological Conditions and Benthic Macroinvertebrates of Lake Tinishu Ababya, Ethiopia

Abstract

The ecological condition of Lake Tinishu Abaya was assessed using benthic macroinvertebrates as well. The results from this aspect of the study showed that a total of 5735 benthic macroinvertebrate specimens comprising of 23 taxa were collected from all the study sites. There was spatial effect on the number and distribution of benthic individuals (p <0.05). It was high at Dacha riverside (n=2089) followed by Bobodo riverside (n=1145), Reference site (n= 963), Badober riverside (n= 859), and Maingate side (n=679). The abundance of benthic communities significantly varied between the study seasons (p<0.05). Higher individuals were observed during the wet season (n=3583) than in the dry season (n=2152). The Hemiptera family were the predominant macroinvertebrates that contributed the largest number (n=2546) of the total samples followed by Diptera (n=878), Coleoptera (n=835, 14.56%) and Gastropoda (n=631). The Ephemeroptera (n=172), Hirudinae (n=335) and Oligochates (n=116) were represented by low number of animals. The majority (about 70%) of the benthic communities of Lake Tinishu Abaya are composed of pollution tolerant species as compared to the presence of pollution sensitive ones (<30%) in most of the sampling sites. This indicated that the existence of organic pollution and thus Lake Tinishu Abaya is undergoing environmental stresses. This obviously calls for participatory and interdisciplinary actions of watershed management and wise use of aquatic resources with compliance to commonly set agenda of sustainable use of natural resources.

Habitat quality–physicochemical water quality–littoral macroinvertebrate community nexus in Lugo Lake (Ethiopia): Priorities for sustainable water resources management

“…Correlation between macroinvertebrate abundance and habitat quality assessment (HabQA) score in Lugo Lake, Northeastern Ethiopia, 2021 evident in the present study where recreational sites with higher WT had lower macroinvertebrate abundance and diversity compared with agricultural counterparts with lower WT. Similar results were found in Lake Tinishu Abaya (Ethiopia), which indicated WT as a major factor governing the assemblage of benthic macroinvertebrates (Enawgaw, 2019). The higher WT detected in recreational sites of this study might be due to high human pressure and associated lower vegetation cover, which possible have increased exposure of lentic systems to sunlight (Mereta et al, 2013).…”

“…recreational sites). Enawgaw (2019) also highlighted that lower pH levels in aquatic systems are expected in areas of high human perturbation and these may cause lower diversity and richness of macroinvertebrates.…”

Used macroinvertebrates as bioindicators to compare water quality from different land uses in Watumokala and Nokambu Rivers, Southeast Sulawesi, Indonesia

“…Calculation of the biotic index value uses the following formula: FBI = , where: FBI: Family Biotic Index value, Xi: Number of individuals in the ith family group, ti: Tolerance level of the ith family group, n: Total number of organisms in the sample. Classification of FBI values (Hilsenhoff 1988;Enawgaw and Lemma 2019), namely, if the value 0-3.75 indicates excellent water quality, 3.76-4.25 (very good), 4.26-5.00 (good), 5.01-5.75 (fair), 5.76-6.5 (fairly poor), 6.51-7.25 (poor) and 7.26-10 (very poor). According to Ogbeibu et al (2013), show the assessment of river water quality with the FBI value, namely if FBI<4.50, the quality of non-impacted river water; 4.51<FBI<6.50 indicates slightly impacted water quality; 6.51<FBI<8.50 water quality moderately impacted; 8.51<FBI<10.00 indicates water quality is severely impacted.…”

“…This can be seen from the anthropogenic influence on the Watumokala River, namely activities related to lowland rice farming and rural settlements which are still dominated by plantation crop farming, whereas on the Watumokala River, there is already the influence of pressure from urban activities which are less agricultural (Anh et al 2023;Ezenwa et al 2023). So the results of the FBI assessment show that at stations that are disturbed by human anthropogenic activities, the water quality is slightly impacted and fairly substantial pollution is likely (Ogbeibu et al 2013;Enawgaw and Lemma 2019).…”

The assessment of water quality by macroinvertebrate and water quality indices in small reservoir (Damsa, Türkiye)

“…Recently, littoral and profundal macroinvertebrate communities have been used in determining and evaluating the effects of different human effects (acidification, eutrophication and hydromorphological changes) on reservoirs and lakes (Bezmaternykh & Krylova, 2016;Jyväsjärvi, 2011;Mastrantuona et al, 2011;Schartau et al, 2008;Yirga & Brook, 2019).…”