Quantification of mass mortality event in freshwater mollusks within the Lower Odra, a large European river, data

• In the summer of 2022, an ecological disaster occurred on the River Odra in Europe, caused by Golden Algae toxins, resulting in an unprecedented mass mortality of fish, bivalves, and water snails. • The disaster led to an estimated 66 million dead individuals, with the Unionidae population declining by 87%, and the native Anodonta anatina species particularly affected with a 95% decrease. • The invasive Sinanodonta woodiana species suffered the least damage, highlighting the potential for an invasive species to take over the ecological niche left by the native mussels. • The disaster resulted in a minimum of 144 million dead water snails washed ashore. • Further research is needed to determine the adaptive capacity of the river's ecosystem and its potential for recovery

Quantifying a mass mortality event in freshwater wildlife within the Lower Odra River: Insights from a large European river. Data

• In the summer of 2022, an ecological disaster occurred on the River Odra in Europe, caused by Golden Algae toxins, resulting in an unprecedented mass mortality of fish, bivalves, and water snails.• The disaster led to an estimated 65 million dead bivalves, with the Unionidae mussels population declining by 86%, and the native Anodonta anatina species particularly affected with a 95% decrease.• The invasive mussel Sinanodonta woodiana suffered the least damage, highlighting the potential for an invasive species to take over the ecological niche left by the native mussels.• The disaster resulted in a minimum of 144 million dead water snails washed ashore (85% decline).• An estimated 3.3 million dead fish (1,025 tons) were found in the lower section of the river, with a significant 60% reduction in fish population biomass along the entire section affected by the disaster

Swans_2021

Sikora & Marchowski 2021. The use of drones in a study of the breeding productivity of swans. Data.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Quantification of mass mortality event in freshwater mollusks within the Lower Odra, a large European river, data

• In the summer of 2022, an ecological disaster occurred on the River Odra in Europe, caused by Golden Algae toxins, resulting in an unprecedented mass mortality of fish, bivalves, and water snails. • The disaster led to an estimated 66 million dead individuals, with the Unionidae population declining by 87%, and the native Anodonta anatina species particularly affected with a 95% decrease. • The invasive Sinanodonta woodiana species suffered the least damage, highlighting the potential for an invasive species to take over the ecological niche left by the native mussels. • The disaster resulted in a minimum of 144 million dead water snails washed ashore. • Further research is needed to determine the adaptive capacity of the river's ecosystem and its potential for recovery.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Quantifying a mass mortality event in freshwater wildlife within the Lower Odra River: Insights from a large European river. Data

• In the summer of 2022, an ecological disaster occurred on the River Odra in Europe, caused by Golden Algae toxins, resulting in an unprecedented mass mortality of fish, bivalves, and water snails.• The disaster led to an estimated 65 million dead bivalves, with the Unionidae mussels population declining by 86%, and the native Anodonta anatina species particularly affected with a 95% decrease.• The invasive mussel Sinanodonta woodiana suffered the least damage, highlighting the potential for an invasive species to take over the ecological niche left by the native mussels.• The disaster resulted in a minimum of 144 million dead water snails washed ashore (85% decline).• An estimated 3.3 million dead fish (1,025 tons) were found in the lower section of the river, with a significant 60% reduction in fish population biomass along the entire section affected by the disaster.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Quantifying a mass mortality event in freshwater wildlife within the Lower Odra River: Data

• Toxins from Golden Algae resulted in an unprecedented mass mortality of fish, bivalves, and water snails.• In the lower Odra, there were 65 million dead Unionidae bivalves, marking an 88% decrease; the native Anodonta anatina declined by 95%; the invasive Sinanodonta woodiana decreased by 15%.• 147 million water snails were found washed ashore in the lower Odra, representing an 85% decline.• The lower Odra witnessed the death of 3.3 million fish (equivalent to 1,025 tons); across the entire 560 km section of the affected river, the toll was 1,650 tons, indicating a 60% reduction in fish population biomass.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

The use of drones to study the breeding productivity of Whooper Swan Cygnus cygnus. Dataset

A drone was used to improve the assessment efficiency of breeding pairs, breeding success, and offspring productivity of Whooper Swan Cygnus cygnus in 2022 in NE Poland. The traditional method of conducting the study from the ground was compared with the method from the air by a drone.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Swans_2021_Sikora&Marchowski

Sikora & Marchowski 2021. The use of drones in a study of the breeding productivity of swans. Data.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Marchowski D. & Ławicki Ł. 2022. Unprecedented mass mortality of aquatic organisms in the Oder, a large European river. Photographic documentation

Documentation of ecological disaster on River Odra. The Odra (German: Oder) is a large river flowing through three countries: the Czech Republic, Poland, and Germany (length: 854 km, basin: 118,861 km²). In late July 2022, the Odra became severely polluted, and its populations of fish and aquatic molluscs suffered hitherto unprecedented mass mortality (Save the Oder Coalition 2022, https://saveoder.org/).THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Goosander_vs_Fishermen

Marchowski D., Flis A., Gwiazda R., Kavetska K.M., Wysocki D. 2021. The dominant species of piscivorous bird does not adversely affect fishery in the lagoons of the southern Baltic Sea. Data set.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV