- 行业: Government
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
In fishes, one or more fins situated on the midline of the back, having spines or rays, sometimes both; excludes the adipose fin found in some fishes, such as catfishes and salmon.
Industry:Natural environment
Pyramid-shaped diagram which shows feeding relationships within a food chain, e.g. That herbivores are smaller, more numerous and faster breeding than the predators that feed on them.
Industry:Natural environment
The knobbed tentacle tip of an anthozoan, usually bearing numerous nematocysts.
Industry:Natural environment
A copulatory structure employed by the males of species that practice internal fertilization to transfer sperm cells into the reproductive tube of the female, e.g., the clasper of a shark, skate or ray; penis; modified anal fin (gonopodium) of live-bearer fishes.
Industry:Natural environment
A group of species that use the same resources in a similar way; an ecological association based on similar roles in a community rather than evolutionary descent, as for example, filter feeders or browsers.
Industry:Natural environment
A mutation that causes a body part of an organism to develop in an inappropriate position.
Industry:Natural environment
