A small flad in the Bothnian Bay national park is separated from the sea by a shallow threshold and a narrow mouth. Photo Metsähallitus Have you ever heard of land uplift or land upheaval phenomenon? Or more correctly “post-glacial rebound”? It means that when the 2-3 km thick Ice age glacier was pressing the Scandinavia, … Continue reading Flads, lagoons
During a couple of sunny days in spring we had the opportunity to go out and learn more about one of the most iconic fish species of the Bothnian Bay - the grayling - and it's favourite habitat on the exposed, rocky shores. Together with our fish expert collegues we searched for grayling eggs along … Continue reading Exposed rocky shorelines – a grayling favourite
The deep sea floors are in constant darkness which means no plants can grow there. But that doesn't mean it's a place empty of life. During the autumn of 2018 SGU (the Geological Survey of Sweden) and partner in the SEAmBTOH project, conducted a survey cruise in the archipelago of Haparanda to map the depths … Continue reading Who lives at the bottom of the sea?
If you ever stand on a shallow sand deposit and try to determine, whether it’s a sandbank or not, you’re not the only one wondering about it. The EU habitats directive tells us that the Natura 2000 habitat 1110 sandbank is predominantly shallower than 20 m and is always covered by water, and it may … Continue reading Unique habitats: Sandbanks
An artificial reef by definition is a man-made underwater structure usually built for a purpose of promoting marine life. It is widely accepted in the scientific community that artificial reefs are very beneficial. They can increase local populations such as algal growth, coral reefs and fish. They also can prevent coastal erosion and force waves … Continue reading Unique habitats: Artificial Reefs
Around november the northern Bothnian Bay starts to transform. From a warm, blue sea with a temperature of up to 20 degrees, to a solid, cold, white plain of ice. Midwinter day on the Bothnian Bay sea ice (Photo by Linnea Bergdahl, County Administrative Board of Norrbotten) The ice starts to form when the temperature … Continue reading Unique habitats: Sea ice
When you think of reefs, you most probably think of tropical coral reefs with lots of colourful fish and clear blue water. Maybe some turtles and sharks as well. Reefs in the Northern Bothnian Bay are nothing like this. The reefs we have are basically just piles of rock. The bedrock is under much too … Continue reading Unique habitats: Reefs