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This study applies an adapted Living Planet Index (LPI) to assess long-term trends in fish populations in the Veleka River (southeastern Bulgaria) from 2010 to 2024. Based on standardized electrofishing data across seven stations, 11 native and naturalized species were analyzed using log-transformed abundance time series. The LPI declined from 1.0 in 2010 to 0.28 in 2024, indicating a 72% reduction in average fish abundance. Potamodromous species (e.g., Barbus cyclolepis, Chondrostoma vardarense) exhibited decline...

Coastal zones are among the most climate-vulnerable environments, exposed to extreme weather events, sea level rise, accelerating coastal erosion, biodiversity loss, and socio-economic vulnerability. As these pressures intensify, adaptation strategies have moved beyond engineered infrastructure toward nature-based solutions restoration interventions that work with ecosystems. One of most spread nature-based coastal restoration are seagrass and saltmarsh recovery, dune and wetland rebuilding, and integrated watersh...

Hermaphroditism in the flathead grey mullet (Mugil cephalus), manifested as intersex conditions, is linked to various environmental factors and anthropogenic pressures. Key contributors include exposure to endocrine-disrupting compounds (EDCs), heavy metals, and pollutants that disrupt hormonal regulation, leading to sexual development abnormalities. Research indicates that Mugil cephalus is particularly sensitive to EDCs in coastal and brackish ecosystems. Our findings reveal that 19% of male individuals from the...

This study examines the geomorphological and structural factors influencing the formation of coastal dunes along the Strandzha coastline of Bulgaria. Through the integration of GIS-based analyses, morphometric data, and geological profiles, the primary morphostructural units shaping coastal dynamics have been identified. These geological, morphostructural, and geomorphological conditions have provided the necessary prerequisites for dune formation. The research identifies a total of 17 dune systems along the Stran...