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  2. Food web - Wikipedia

    en.wikipedia.org/wiki/Food_web

    For example, human food webs, agricultural food webs, detrital food webs, marine food webs, aquatic food webs, soil food webs, Arctic (or polar) food webs, terrestrial food webs, and microbial food webs. These characterizations stem from the ecosystem concept, which assumes that the phenomena under investigation (interactions and feedback loops ...

  3. Trophic level - Wikipedia

    en.wikipedia.org/wiki/Trophic_level

    Within a food web, a food chain is a succession of organisms that eat other organisms and may, in turn, be eaten themselves. The trophic level of an organism is the number of steps it is from the start of the chain. A food web starts at trophic level 1 with primary producers such as plants, can move to herbivores at level 2, carnivores at level ...

  4. Marine food web - Wikipedia

    en.wikipedia.org/wiki/Marine_food_web

    The polar regions are characterised by truncated food webs, and the role of viruses in ecosystem function is likely to be even greater than elsewhere in the marine food web. Their diversity is still relatively under-explored, and the way in which they affect polar communities is not well understood, [ 139 ] particularly in nutrient cycling.

  5. Polar seas - Wikipedia

    en.wikipedia.org/wiki/Polar_seas

    The polar seas contain a huge biome with many organisms. Among the species that inhabit various polar seas and surrounding land areas are polar bear, reindeer (caribou), muskox, wolverine, ermine, lemming, Arctic hare, Arctic ground squirrel, whale, harp seal, and walrus. [1] These species have unique adaptations to the extreme conditions.

  6. Energy flow (ecology) - Wikipedia

    en.wikipedia.org/wiki/Energy_flow_(ecology)

    A food pyramid and a corresponding food web, demonstrating some of the simpler patterns in a food web. A graphic representation of energy transfer between trophic layers in an ecosystem. Energy flow is the flow of energy through living things within an ecosystem. [1]

  7. Polar bears, pushed on land by climate change, get their own ...

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  8. Polar ecology - Wikipedia

    en.wikipedia.org/wiki/Polar_ecology

    In warmer areas of the polar regions moths, butterflies and beetles can be found. Some of the larger animals that exist are foxes, wolves, rabbits, hares, polar bears, reindeer/caribou. There are various bird species that have been spotted in the Arctic. Eight species of birds reside on the polar tundra year round while 150 breed in the Arctic ...

  9. Polar bears face existential threat as ice melts. Some in ...

    www.aol.com/news/group-polar-bears-greenland...

    An isolated group of polar bears living in southeast Greenland has surprised scientists with its ability to survive in a habitat with relatively little sea ice. Polar bears face existential threat ...

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