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Biodiversity Dynamics and Ecological Stressors in the Caspian Sea: Integrating Pollution, Climate Change, and Microbial Interactions
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This is a duplicate entry of the same Caspian Sea biodiversity and pollution review (ID 2415), documenting the same findings of 38% decline in benthic diversity and significant microplastic accumulation up to 3,200 particles per kilogram of sediment in the southern basin.
The Caspian Sea, the largest enclosed inland water body on Earth, hosts a unique and vulnerable ecosystem characterized by high levels of endemism and complex ecological interactions. Over recent decades, anthropogenic pressures including pollution, overfishing, habitat degradation, and climate-induced sea level decline have led to a severe biodiversity crisis. This study synthesizes updated data from ecological surveys, pollution monitoring, and microbial community analyses to assess biodiversity patterns and environmental stressors in the Caspian Sea from 2010 to 2025. Using a combination of field-based indices (Shannon–Wiener diversity index, species evenness) and remote-sensing data, this paper explores how hydrological fluctuations, microplastic and heavy metal contamination, and microbial shifts collectively influence ecosystem functioning. The findings indicate a measurable reduction in benthic macrofaunal diversity (by 38%), significant accumulation of microplastics (up to 3200 particles kg⁻¹ in southern sediments), and rising dominance of opportunistic microbial taxa linked to oil degradation. These trends demonstrate that the Caspian Sea’s biodiversity is under accelerating stress, demanding urgent implementation of adaptive management frameworks. Recommendations are proposed for conservation strategies integrating ecological monitoring, pollution mitigation, and climate adaptation at the regional scale. Keywords: Caspian Sea, biodiversity, pollution, microbial ecology, climate change, environmental stressors .
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Biodiversity Dynamics and Ecological Stressors in the Caspian Sea: Integrating Pollution, Climate Change, and Microbial Interactions
AI summary Read the abstract
A comprehensive review of the Caspian Sea from 2010 to 2025 documents a 38% decline in bottom-dwelling animal diversity alongside microplastic contamination of up to 3,200 particles per kilogram of sediment in the southern basin, compounding pressures from oil pollution, overfishing, and a shrinking sea level. The findings show that the world's largest inland water body is experiencing rapid, multi-stressor ecosystem collapse that will require coordinated international management to reverse.
Microplastics in Sediments of Southwest Caspian Sea: Characteristics, Distribution and Seasonal Variability
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This study monitored microplastic contamination in Caspian Sea sediments across four seasons, finding plastic particles present at all times and locations with an average of nearly 400 particles per kilogram of sediment. Seasonal variation in microplastic abundance was detected, likely linked to wind and current patterns that affect particle transport and deposition.
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Microplastic occurrence was assessed in sediments from both recreational-tourism and non-tourist areas along the southern Caspian Sea coast of Iran. The study found microplastics at all sampling sites, with higher concentrations in tourist areas, establishing baseline contamination data for this large landlocked sea.
An In-depth Study of Meso- and Microplastics Contamination in Sediments of Southern Coasts of the Caspian Sea
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Researchers analysed meso- and microplastic contamination in sediments from the southern coasts of the Caspian Sea using density-based separation, finding mesoplastic concentrations of 14-38 particles per kilogram and microplastic concentrations of 100-286 particles per kilogram dry weight.
Distribution and Characterization of Microplastics in Surface Waters and the Southern Caspian Sea Coasts Sediments
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Researchers investigated the distribution and characteristics of microplastics in surface waters and coastal sediments of the southern Caspian Sea across eight sampling stations, documenting concentrations and polymer types in the world's largest enclosed aquatic ecosystem.
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