Benthic invertebrates community of the River Euphrates upstream and downstream sectors of Al‐Qadisia dam, Iraq

Al‐Lami, Ali A.; Jaweir, Hayfa J.; Majeed, Osama S.

doi:10.1002/(sici)1099-1646(199807/08)14:4<383::aid-rrr507>3.3.co;2-b

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…The pH value of AL-Gharraf River in study sites during of most studied period was alkaline side above 7, and this result agreed with [13], they reported that Iraqi inland water is regarded to be on the alkaline side of neutrality, reflecting geological formations of the area and the results are agree with the finding that recorded by [14] [15]. Electrical conductivity used as an indicator of water quality based on total dissolved salts [16].…”

Section: Discussionsupporting

confidence: 86%

Seasonal Variations in the Physico-chemical and Biological Characteristics of Al-Gharraf River within Al-Haay City Southern of Iraq.

Al-Mayah¹,

Shawardi²,

Salman³

2018

eduj

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The study reports the seasonal changes in water quality of Al-Gharraf, one of the main tributaries of the Tigris river. Monthly sampling was carried out from December 2015 till November 2016 for a year. The study location situated in the south-eastern sector of Iraq and surrounded by wide and fertile agricultural lands. Three stations were selected to. The former is located at 5 km before entrance of AL-Hayy City as control. The second is situated at distance 5 km away from the former (mid of ALHayy City) represented study area and the latter station is located at 15 km apart from the second one (end of AL-Hayy City). collecting samples monthly ,two samples were taken each month.In the present study Fourteen physical and chemical parameters were analyzed based on the importance of these parameters. These Fourteen parameters are ranged as following: air temperature (16 to 32) ºC, water temperature (11 to 26) ºC, pH (7. The study results also showed that the heavy metals concentrations (cadmium and lead) were 0.002-0.089 ppm and 0.031-0.21 ppm respectively. Concentrations of these metals of Al-Gharraf River showed seasonal variations during the study period and they are exceeding permissible limits for Iraqi standard specifications and WHO standard for drinking.The highest bacterial count was recorded at sit.2 the during winter 2016, 2800 cell /1 ml , whereas the lowest value was found during summer 2016, 320 cell /100ml. whereas numbers of E.coli were (230-1700) cell/10ml. Key Words: physic -chemical and biological parameters, water quality, Al-Gharraf river. ‫التربية‬ ‫كلية‬ ‫مجلة‬ ‫والعشرون‬ ‫التاسع‬ ‫العدد‬ IntroductionRivers have always been the most important fresh water resources, and most developmental activities are still dependent upon them. Rivers play a major role in assimilating or carrying industrial and municipal waste water, manure discharge and runoff which are responsible for water river pollution[1] [2]. The degree of pollution is generally assessed by studying physical and chemical characteristics of the water bodies [3]. Iraqi inland waters witness tremendous impacts through discharges of manufacturers, agricultural and domestic sewage [4] [5]. Quite few studies were performed on Tigris River [6] [7] [8], but no work had considered Al-Gharraf canal in Al-Haay City. The present study has taken in consideration the investigation of abiotic conditions in this vital habitat on monthly basis.

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Section: Discussionsupporting

confidence: 86%

Seasonal Variations in the Physico-chemical and Biological Characteristics of Al-Gharraf River within Al-Haay City Southern of Iraq.

Al-Mayah¹,

Shawardi²,

Salman³

2018

eduj

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“…The pre-restoration differences between sites are also similar to a water diversion/dam system in Portugal where a large degree of community variation was found downstream of the dam and water impoundment (Cortes et al, 1998). Dams however do not always reduce the diversity and density of macroinvertebrate communities (Casas et al, 2000) and can even increase densities (Al-Lami et al, 1998). Habitats below dams can be hospitable for macroinvertebrates if nutrient concentrations are elevated below the dam (Casas et al, 2000) or current velocity and substrate availability are more favorable (AlLami et al, 1998), although this was not the case in Fossil Creek.…”

Section: Discussionmentioning

confidence: 99%

“…Although dams often alter both upstream and downstream food webs, particularly with respect to the macroinvertebrate community (Power et al, 1996;Al-Lami et al, 1998;Cortes et al, 1998;Stanley et al, 2002), one study found that litter decomposition, macroinvertebrate biomass, biological oxygen demand, and nutrient concentrations were not different in sites above and below a dam, indicating that negative effects of dams may not be universal (Casas et al, 2000). Consequently, comparisons before and after restoration are important in establishing whether restoration projects such as dam decommissionings are successful in improving the overall condition of an ecosystem .…”

Section: Introductionmentioning

confidence: 99%

Short-term responses of decomposers to flow restoration in Fossil Creek, Arizona, USA

et al. 2008

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Dam decommissioning projects, although numerous, rarely include complete sets of data before and after restoration for evaluating the ecological consequences of such projects. In this study, we used a before-after control-impact (BACI) design to assess changes in leaf litter decomposition and associated macroinvertebrate and fungal decomposers following dam decommissioning in Fossil Creek, Arizona, USA. Leaf litterbags were deployed in a relatively pristine site above the dam and a highly disturbed site below the dam where over 95% of the flow was previously diverted for hydropower generation. Leaf litter decomposition was significantly slower below the dam both measurement years (pre-and postrestoration) with no site-year interaction, indicating that decomposition in this stream section was not affected by increased flow. In contrast, both macroinvertebrates and fungi differed significantly above and below the dam prior to restoration but were similar post-restoration, supporting the concept that decomposer communities can quickly rebound following reintroduction of full flow. Our results indicate that some aquatic ecosystem variables can return to a more natural state following ecological restoration activities such as water flow restoration.

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“…Such adaptability favors the presence and abundance of these invertebrates in the reservoir. These groups predominate in other reservoirs, too (Prat, 1978;Kaster and Jacobi, 1978;Hale and Bayne, 1980;Di Giovanni et al, 1996;Thomas andMunteanu, 1997 andAl-Lami et al, 1998).…”

Section: Discussionmentioning

confidence: 96%

Variação espacial da comunidade bêntica no reservatório de Corumbá, Estado de Goiás, Brasil

Moretto¹,

Higuti²,

Takeda³

2003

Acta Sci. Biol. Sci.

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ABSTRACT. The benthic community composition and abundance were analyzed in three stations of the Corumbá reservoir. Collections were undertaken at the margin and the center of the stations, aiming to analyze the abiotic parameters affecting this community. Variables such as depth, dissolved oxygen and sediment type were the main factors that determined the benthic community structure. Fauna was abundant in the marginal region, probably because of the lower depth and higher dissolved oxygen concentrations. The opposite occurred at the central region, with the exception of the reservoir's riverine station. This fact may be due to the shallowness of the place and the water current high speed. Oligochaeta and Chironomidae were the most frequent and abundant taxa in the Corumbá Reservoir. These results show that the benthic community in the reservoir is spatially related to depth and to dissolved oxygen.Key words: benthic community, reservoir, abundance, spatial variation. RESUMO. Variação espacial da comunidade bêntica no reservatório de Corumbá, Estado de Goiás, Brasil.A composição e a abundância da comunidade bêntica foi analisada em três estações do reservatório de Corumbá. Foram feitas coletas na margem e no centro das estações, visando a analisar os parâmetros abióticos que influenciaram essa comunidade. Variáveis, tais como profundidade, oxigênio dissolvido e o tipo de sedimento, foram os principais fatores que determinaram a estrutura da comunidade bêntica. A fauna apresentou uma maior abundância na região marginal, provavelmente devido às menores profundidades e maiores concentrações de oxigênio dissolvido. O inverso foi verificado na região central, exceto na estação fluvial do reservatório, pois trata-se de um local raso e com maior velocidade de correnteza. Oligochaeta e Chironomidae foram os principais táxons em freqüência e abundância no reservatório de Corumbá. A partir desses resultados, pode-se sugerir que a comunidade bêntica no reservatório estudado está relacionada, espacialmente, com a profundidade e com o oxigênio dissolvido.Palavras-chave: comunidade bêntica, reservatório, abundância, variação espacial.

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Benthic invertebrates community of the River Euphrates upstream and downstream sectors of Al‐Qadisia dam, Iraq

Cited by 6 publications

References 5 publications

Seasonal Variations in the Physico-chemical and Biological Characteristics of Al-Gharraf River within Al-Haay City Southern of Iraq.

Seasonal Variations in the Physico-chemical and Biological Characteristics of Al-Gharraf River within Al-Haay City Southern of Iraq.

Short-term responses of decomposers to flow restoration in Fossil Creek, Arizona, USA

Variação espacial da comunidade bêntica no reservatório de Corumbá, Estado de Goiás, Brasil

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