- 行业: Government
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
A line with a lead weight on the end used to measure depth. The lead is dropped into the water and marks on the line are read to determine the current water depth. The lead usually has a cavity to return a sample of the bottom type (mud, sand, etc.).
Industry:Natural environment
A plant which lacks tissues to conduct water and nutrients. Nonvascular plants do not produce flowers or seeds.
Industry:Natural environment
A solution or liquid whose chemical makeup neutralizes acids or bases without a great change in ph.
Industry:Natural environment
A type of nudibranch (order Nudibranchia) in which the mantle is extended into long finger-like projections, the cerata (sing: ceras), rather than a feather-like external gill on the dorsal surface. The cerata contain branches of the digestive gland. The tips of the cerata contain cnidosacs which usually store nematocysts that are obtained from ingested cnidarian prey, such as hydroids, sea anemones and soft corals. If threatened, the nudibranch is capable of discharging these stinging cells through a terminal pore in the ceras. This action is an effective deterrent to predators.
Industry:Natural environment
An external skeleton or supportive covering of an animal formed from the ectoderm, as for example, the shell coverings of a crustacean, the calcium carbonate secretions of stony corals, or the bony plates of an armadillo.
Industry:Natural environment
Any sudden physical injury or damage to an organism caused by an external force or violence. Trauma is also used to describe severe emotional or psychological shock or distress.
Industry:Natural environment
Fishes, usually of commercial value, that live on or near the bottom; also called "bottom fish".
Industry:Natural environment
One of many horizontal partitions across the corallite within the corallite wall.
Industry:Natural environment
Satellite whose orbit around the equator equals that of the Earth's rotation, making it possible for them to view the same disc of Earth's surface below continuously.
Industry:Natural environment
The cultivation of more than one species of organism in an aquaculture system.
Industry:Natural environment
