Survey and determination of Anzali wetland trophic state through geographic information systems (GIS)

Akbarzadeh, Abdolhamid; Laghai, Hasan-Ali; Monavari, Seyed Masoud; Nezami, Shaban Ali; Shokrzadeh, Mohammad; Saravi, Seyed Soheil Saeedi

doi:10.1080/02772240701850681

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…This pattern also emphasizes the importance of soil erosion on the conditions of the Anzali Wetland. The very high loads of P and OC have resulted in eutrophication of the Wetland, a fact that has been shown by several researchers [17][18][19].…”

Section: A Sediment Yieldmentioning

confidence: 99%

Estimation of Sediment, Organic Carbon, and Phosphorous Loads from Pasikhan River into Anzali Wetland, Iran

Asadi¹

2016

IJEP

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Abstract-The Anzali Wetland, located on the southern coast of the Caspian Sea in northern Iran, is internationally known as a habitat of migratory birds. This is an important area as a spawning and nursery ground for fish, and as a breeding and wintering area for a wide variety of waterfowl. Environmental conditions in the Anzali Wetland have been degraded due to the increased inflow of sewerage, wastewater, and solid waste from industry, agriculture and urban areas. There is also an inflow of sediment from the upper stream mountainous area. This study aims to measure and estimate the total annual OC and phosphorous delivered from Pasikhan River into the Wetland. The estimation of sediment delivery to the Anzali Wetland was updated based on the suspended load measurements in sedimentological stations for nine major entering rivers. Total sediment load was estimated at 683.5 × 10 3 ton y -1 ; this shows a significant increase from previous estimations. This indicates that soil erosion is an important problem in the Anzali watershed. Water sampling was performed at Pasikhan River's Nokhaleh Hydrometric Station, since Pasikhan is considered the most important river entering the Anzali Wetland during one year. The samples were analyzed for phosphorous fractions and organic carbon content of suspended sediment. P concentration and OC showed monthly changes. Both were high in wet months (September to March) and lower in dry months. This pattern also emphasizes the importance of soil erosion on the conditions of the Anzali Wetland. Total OC and P load from Pasikhan River into the Wetland were estimated to be 2710 ton y -1 and 245 ton y -1 , respectively.

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Section: A Sediment Yieldmentioning

confidence: 99%

Estimation of Sediment, Organic Carbon, and Phosphorous Loads from Pasikhan River into Anzali Wetland, Iran

Asadi¹

2016

IJEP

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“…It also serves as an important spawning and nursery ground for the economically anadromous fishes (Talebi 1998). Previous studies emphasized that the environmental quality of this wetland especially eastern part of it has exacerbated during the last years (Pourang 1994(Pourang , 1996Talebi 1998;Akbarzadeh et al 2008;Tahershamsi et al 2009;Pourang et al 2010). These fundamental changes have mainly caused by the discharge of Rasht and Anzali's raw sewage, ground subsidence, and increasing of Caspian Sea level (Yazdanparast et al 2004).…”

Section: Introductionmentioning

confidence: 93%

“…So, a great amount of pollutant body burdens are eliminated during the spawning actively. Furthermore, this wetland is a eutrophic ecosystem (Akbarzadeh et al 2008). The growth rate of pike is significantly higher in eutrophic in comparison with oligotrophic lakes and fastgrowing fish has significantly lower levels of PCBs than the slow-growing ones accordingly (Borgman 1985;Larsson et al 1992;Blanchard et al 1997).…”

Section: Polychlorinated Biphenylsmentioning

confidence: 99%

“…These fundamental changes have mainly caused by the discharge of Rasht and Anzali's raw sewage, ground subsidence, and increasing of Caspian Sea level (Yazdanparast et al 2004). According to the published reports the annual suspended sediment load to Anzali is estimated to be 386,602 tons (YEKOM 1990) and Pirbazar River with average TP of 0.48 mg/l and TN of 3.5 mg/l is the most polluted river entering the eastern part of the wetland (Akbarzadeh et al 2008). These conditions along with marsh blooms have changed this wetland over to a eutrophic ecosystem.…”

Section: Introductionmentioning

confidence: 98%

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Determination of polychlorinated biphenyls and total mercury in two fish species (Esox lucius and Carassius auratus) in Anzali Wetland, Iran

Sakizadeh

Sari

Abdoli

et al. 2011

Environ Monit Assess

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The Anzali Wetland is one of the most important ecosystems in the north of Iran, and parts of it were registered as a Ramsar site in 1975. However, even though, due to many problems, including eutrophication produced by inflow of excess nutrients and organic materials, the wetland was also listed on the Montreux Record indicating the need to take urgent remedial action. This study was conducted to study the levels of polychlorinated biphenyls (PCBs) and total mercury (THg) in two fish species (Esox lucius and Carassius auratus) as bio-indicators of the ecosystem condition in eastern part of Anzali Wetland. The sampling was carried out in six different periods between years 2009 and 2010. The results showed that the amounts of PCBs in the muscle of northern pike were below the detection limit of gas chromatography, whereas the average concentration in goldfish was 0.449 mg/kg wet weight. Some possible reasons for the higher levels of PCBs in goldfish in comparison with pike have been discussed. No significant (p < 0.05) correlation was observed between PCBs and biological factors (weight, length, lipid content) for both species. On the other hand, the mean concentration of THg in the muscle of pike and goldfish were 182.22 and 75.27 ng/g dry weight, respectively. Although these concentrations were below US-EPA criterion for human consumption (0.3 mg/kg), it pointed up a significant deterioration of the ecosystem condition during the past years. Finally, statistical analysis revealed a significant correlation between THg with weight and an insignificant correlation with length for pike specimens.

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“…Although many researchers have studied the Anzali Wetland from the pollutionrelated, faunistic, and ecological points of view (e.g. Ayati 2003;JICA 2005;Charkhabi and Sakizadeh 2006;Akbarzadeh et al 2008;Jafari 2009;Tahershamsi et al 2009;Mirzajani et al 2010;Pourang et al 2010;Jamshidi-Zanjani and Saeedi 2013), there are no data on the species diversity of the Oligochaeta of the region, except the single record of Tubifex tubifex by Pourang (1996). The aquatic Oligochaeta species of Iran are mentioned only in a few papers: Stephenson (1920), Egglishaw (1980), Aliyev and Ahmadi (2010), Ahmadi et al (2011Ahmadi et al ( , 2012, Ardalan et al (2011), Jabłońska andPesić (2014).…”

Section: Introductionmentioning

confidence: 99%

Oligochaetes (Annelida, Clitellata) in the Anzali International Wetland, north-western Iran

Nazarhaghighi¹,

Timm²,

Nadoushan³

et al. 2014

Estonian J. Ecol.

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In order to determine the Oligochaeta fauna of the Anzali International Wetland (northwestern Iran), samples of bottom sediment and aquatic vegetation were collected from 13 stations eight times from August 2012 to June 2013. As a result of the study, 11 species and one genus were identified: Tubifex tubifex, Limnodrilus claparedeianus, L. hoffmeisteri, Potamothrix hammoniensis, P. bedoti, Branchiura sowerbyi, Nais pardalis, Ophidonais serpentina, Dero digitata, Stylaria lacustris, Slavina appendiculata, and Mesenchytraeus sp. Some physico-chemical parameters of the water (depth, temperature, dissolved oxygen, and pH) were measured at the sampling site. The average density of the total oligochaete community in the benthos of the wetland was 6077 ind. m -2 . The Shannon-Wiener diversity index was on average 0.92, with a maximum of 1.57 and a minimum of 0.44 at different stations. Results indicated that the maximum and the minimum density were observed in June (21 837 ind. m -2 ) and in December (1041.9 ind. m -2 ), respectively. Most frequent and abundant species were the tubificids L. hoffmeisteri, L. claparedeianus, and P. hammoniensis. All determined oligochaete taxa except T. tubifex were new to the Anzali Wetland, including seven new to the fauna of Iran. The structure of the Oligochaeta community correlated with the progression of the trophic state of the aquatic ecosystem.

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Survey and determination of Anzali wetland trophic state through geographic information systems (GIS)

Cited by 11 publications

References 5 publications

Estimation of Sediment, Organic Carbon, and Phosphorous Loads from Pasikhan River into Anzali Wetland, Iran

Estimation of Sediment, Organic Carbon, and Phosphorous Loads from Pasikhan River into Anzali Wetland, Iran

Determination of polychlorinated biphenyls and total mercury in two fish species (Esox lucius and Carassius auratus) in Anzali Wetland, Iran

Oligochaetes (Annelida, Clitellata) in the Anzali International Wetland, north-western Iran

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