Fauna of Europe of the Baltic Sea has led to the evolution of many slightly divergent species, such as the Baltic Sea herring, which is a smaller variant of the Atlantic herring. The most frequent benthic species are "Saduria entomon" and "Monoporeia affinis", which is originally a freshwater species. A great part of its bottom is anoxic and without animal life. The Baltic Sea and North Sea are also home to a variety of marine mammals (common seals, grey seals). Europe contains several important freshwater ecoregions, including the heavily developed rivers of Europe, the rivers of Russia, which flow into the Arctic, Baltic,
Wildlife of the Falkland Islands sea. Introduced brown trout, have been established in many freshwater streams and have also formed sea-runs resulting in an increase in body size. Due to the introduction of brown trout and other fish species the endemic zebra trout (a galaxiid fish unrelated to typical salmonid trout) is now restricted to small streams in remote parts of West Falkland and Lafonia. Different species of krill are found in Falkland waters, with lobster krill inhabiting the warmer waters in the north. Vegetation on the archipelago is composed of grasses, ferns, and shrubs. Around 363 species of vascular plants have been recorded on