![]() They can support much wildlife, often bringing it into urban areas – some are of international importance for their aquatic flora and invertebrates.ĭitches were often part of farmland. They have little flow and have more in common with ponds than rivers. However, many have been restored and are used for recreation. Canals were created for transport but fell into decline as they were replaced by trains and roads. Lakes are temporary features, eventually filling with sediment and developing fen vegetation, but this is a very slow a process.Ĭanals and ditches are also artificial water bodies. Many lakes and ponds were created by gravel extraction or as reservoirs, fish ponds, mill ponds or for livestock. Most natural lakes are found where glaciers gouged out deep valleys, or deposited debris that creates a natural dam. As nowhere in the UK is that far from the sea, water doesn’t travel far enough for very large rivers to form. Eventually, rivers reach the coast and the water flows into the sea. When a river reaches the lowlands, it slows and meanders across a broad, flat and fertile floodplain. This drains from a catchment, flowing rapidly downhill in the uplands, over time eroding a shaped valley. Streams start from springs, snowmelt or rainwater. It has been said by several people that the seals may be able to learn how locks work.Waterbodies vary greatly according to the shape of the land, the rock beneath them and the movement of water. A year later another seal was seen in the Schildmeer. When the animal was later spotted again at Farmsum, it seemed that the animal knew what it was doing. To get to that lake, the seal first had to swim through a channel to the south, and then swim into a small drainage channel. It was first seen at Farmsum, then at Schildmeer. The seal that has already been seen a number of times in the Schildmeer, for example. In other cases, seals seem to know very well how to move between sea and lake. If those animals do not receive enough food, then action must be taken to help them return to the sea. Sometimes seals find a way, but they get lost along the way and can't find their way back. Because of all the locks, dikes and scuppers, it is quite difficult for a seal to find an easy way to inland. The construction of flood defenses in all major rivers in the Netherlands has probably contributed to this. It is believed that more seals visited the Dutch inland waterways in the past, but that has decreased in the last century. August 2021: common seal Thor spotted first in Peizerdiep, later in De Onlanden.November 2016: common seal “Hulcky” spotted in Veluwemeer.March 2016: common seal in the Maasplassen near the Weerd in Roermond.October 2015: common seal in Biesbosch.August 2015: ringed seal in Utrecht canals, collected at seal sanctuary A Seal in Stellendam.The animal was seen with fish in its mouth. December 2013: common seal in the Schildmeer, Groningen.April 2013: common seal in river Hunze in Drenthe, moved on by itself.January 2013: common seal in the Meuse near Dreumel.The animal seemed to swim back and forth between the Schildmeer and Farmsum. December 2012: common seal in the Schildmeer, Groningen.December 2012: common seal in the Biesbosch.March 2012: common seal near Goudswaard, South Holland. ![]() Since March 2012 we have had more reports: After a while he found his way back on his own. Thanks to its tag and its spots on fur, we were able to recognize that it was this specific seal. Seal Thor was just seen in the fresh water of De Onlanden after we had caught and released him. She was taken in at the Sealcentre and eventually released back into the sea. We took Hulcky from the Veluwemeer when it turned out that she was suffering from a lungworm infection. The two most recent cases reported to us are seals Hulcky and Thor. ![]()
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