Caspian Sea: Environmental controls and trophic webs interactions

Roohi, Aboulghasem; Kıdeyş, Ahmet E.; Jolodar, Mehdi Naderi; Bandpei, Mohammadali Afraei; Rostami, Ali Mokarami

doi:10.5897/joms2020.0159

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…The maximum DCM values observed in autumn and winter during the study period when the south Caspian Sea was impacted by the invasion of Jellyfish species named as “M. leidy” (Roohi et al., 2021 ). Kideys et al.…”

Section: Resultsmentioning

confidence: 99%

“…This river basin alone contributes up to 50% of annual wastewater inputs to the Caspian Sea (23-25 km 3 ) (Kostianoy & Kosarev, 2005). Ever-increasing algal bloom events and other environmental hazards have been repeatedly reported in different parts of the Caspian Sea during the last two decades (Ivanov et al, 2012;Kopelevich et al, 2008;Korshenko & Gul, 2006;Moradi, 2013Moradi, , 2014Nasrollahzadeh et al, 2011;Roohi et al, 2021;Soloviev, 2005;Zonn, 2005). In this context, we aim to highlight the recent spatial-temporal changes in Chl-a concentration and the sea eutrophication using the MODIS-Aqua level 3 satellite data in the Caspian Sea, from 2018 to 2021.…”

Section: Study Areamentioning

confidence: 98%

“…The maximum DCM values observed in autumn and winter during the study period when the south Caspian Sea was impacted by the invasion of Jellyfish species named as "M. leidy" (Roohi et al, 2021). Kideys et al (2008) investigated the impact of "M. leidy" invasion on the seasonal changes of Chl-a concentration in the south Caspian Sea (Kideys et al, 2008).…”

Section: Changes In the Deep Chlorophyll-a Maxima (Dcms)mentioning

confidence: 99%

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Satellite‐Based Monitoring of Eutrophication in the Earth's Largest Transboundary Lake

et al. 2023

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The world's large lakes and their life‐supporting services are rapidly threatened by eutrophication in the warming climate during the Anthropocene. Here, MODIS‐Aqua level 3 chlorophyll‐ a data (2018–2021) were used to monitor trophic state in our planet's largest lake, that is, the Caspian Sea that accounts for approximately 40% of the total lacustrine waters on Earth. We also used the in situ measurements of chlorophyll‐ a data (2009–2019) to further verify the accuracy of the data derived from the MODIS‐Aqua and to explore the deep chlorophyll‐ a maxima (DCMs) in the south Caspian Sea. Our findings show an acceptable agreement between the chlorophyll‐ a data derived from the MODIS‐Aqua and those measured in situ in the coast of Iran (coefficient of determination = 0.71). The oligotrophic, mesotrophic, and eutrophic states cover 66%, 20%, and 13% of the sea surface area, respectively. The DCMs are dominantly regulated by water transparency and they generally observe at depths of less than 20 and 30 m during the cold (autumn and winter) and warm (spring and summer) seasons, respectively. Our results suggest an ever‐increasing chlorophyll‐ a in the shallow zones (i.e., coasts) and even in deep regions of the sea, mainly due to nutrient inputs from the Volga river delta. Alarming increase of chlorophyll‐ a in this transboundary lake can amplify eutrophication under the lens of global warming and further threaten the lake ecosystem's health, where almost all legal agreements have not yet been implemented to protect the lake environment and its rich resources.

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Section: Resultsmentioning

confidence: 99%