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  2. Marine food web - Wikipedia

    en.wikipedia.org/wiki/Marine_food_web

    A food web model is a network of food chains. Each food chain starts with a primary producer or autotroph, an organism, such as an alga or a plant, which is able to manufacture its own food. Next in the chain is an organism that feeds on the primary producer, and the chain continues in this way as a string of successive predators.

  3. Navigational aid - Wikipedia

    en.wikipedia.org/wiki/Navigational_aid

    Lead marks (as in "leading a ship into a safe place") and lights are fixed markers that are laterally displaced to allow a mariner to navigate a fixed channel along the preferred route. They are also known as "channel markers". [14] [failed verification] They can normally be used coming into and out of the channel. When lit, they are also ...

  4. Food web - Wikipedia

    en.wikipedia.org/wiki/Food_web

    A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.

  5. How do boaters avoid hazards? What to know about markers ...

    www.aol.com/boaters-avoid-hazards-know-markers...

    Just like traffic lights and signs help drivers on the road, boaters have buoys and signs to guide them to and from shore safely.

  6. Food chain - Wikipedia

    en.wikipedia.org/wiki/Food_chain

    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 ...

  7. Buoy - Wikipedia

    en.wikipedia.org/wiki/Buoy

    Marker buoys, used in naval warfare (particularly anti-submarine warfare) emit light and/or smoke using pyrotechnic devices to create the flare and smoke. Commonly 3 inches (76 mm) in diameter and about 20 inches (500 mm) long, they are activated by contact with seawater and float on the surface.

  8. Clues at Marker 15? Debris, damage indicate Keys boat may ...

    www.aol.com/clues-marker-15-debris-damage...

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  9. Fishing down the food web - Wikipedia

    en.wikipedia.org/wiki/Fishing_down_the_food_web

    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 ...

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