- 行业: Government
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
Any member of the crab family Portunidae (order Decapoda, class Malacostraca). In these crabs, the hindmost pair of legs (5th pair) are flattened into paddles for swimming. The family includes the blue crab (Callinectes sapidus), an edible crab of the Atlantic coast of North America; the velvet crab, Portunus sp of the Atlantic and Pacific oceans and the Mediterranean Sea; and Scylla serrata (mangrove crab) of the Indo-Pacific region; also called swimming crab .
Industry:Natural environment
In mammals, a temporary increase in the threshold of hearing (minimum intensity need to hear a sound) at a specific frequency that returns to its pre-exposure level over time.
Industry:Natural environment
Mutualism in which one or both species in the association may survive and maintain populations in the absence of the other species.
Industry:Natural environment
Refers to random-mating populations; one in which all members are equally likely to interbreed.
Industry:Natural environment
The breaking down of a compound into fragments by the addition of a molecule of water. The hydroxyl group is incorporated in one fragment and the hydrogen atom in the other.
Industry:Natural environment
The long-term fluctuations in temperature, precipitation, wind, and all other aspects of the Earth's climate. It is also defined by the United Nations Convention on Climate Change as "change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods"; an observed change in the prevailing or average weather conditions.
Industry:Natural environment
Unit of radioactive decay equal to 1 million disintegrations per second.
Industry:Natural environment
