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The mean chain length of an entire web is the arithmetic average of the lengths of all chains in a food web. [43] [15] In a simple predator-prey example, a deer is one step removed from the plants it eats (chain length = 1) and a wolf that eats the deer is two steps removed from the plants (chain length = 2).
Marine food web. The pelagic food web, showing the central involvement of marine microorganisms in how the ocean imports nutrients from and then exports them back to the atmosphere and ocean floor. A marine food web is a food web of marine life. At the base of the ocean food web are single-celled algae and other plant-like organisms known as ...
The mean trophic level is calculated by assigning each fish or invertebrate species a number based on its trophic level.The trophic level is a measure of the position of an organism in a food web, starting at level 1 with primary producers, such as phytoplankton and seaweed, then moving through the primary consumers at level 2 that eat the primary producers to the secondary consumers at level ...
Food chain in a Swedish lake. Osprey feed on northern pike, which in turn feed on perch which eat bleak which eat crustaceans.. A food chain is a linear network of links in a food web, often starting with an autotroph (such as grass or algae), also called a producer, and typically ending at an apex predator (such as grizzly bears or killer whales), detritivore (such as earthworms and woodlice ...
Poke (pronounced poke-ay), a Hawaiian word meaning "to chop" or "to cut," refers to a traditional Hawaiian salad of diced raw fish in a simple, soy-based sauce with punchy seasonings like toasted ...
The shipwreck of the RMS Titanic was found on Sept. 1, 1985. The first phase of the mission began on July 1, 1985. It consisted of the French team aboard the French research vessel Le Suroit. Le ...
Loaded 0%. Kids bored again? Try these DIY kid activities that are anything but passive. Burn energy with an indoor parkour track, design a cell phone case, or draw on the walls with (removable ...
A nutrient cycle (or ecological recycling) is the movement and exchange of inorganic and organic matter back into the production of matter. Energy flow is a unidirectional and noncyclic pathway, whereas the movement of mineral nutrients is cyclic. Mineral cycles include the carbon cycle, sulfur cycle, nitrogen cycle, water cycle, phosphorus ...
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