Glossary of Terminology: Z

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Number of records found : 25

zeitgeber - a periodic environmental signal that entrains a biological rhythm. For example, a cycle for a circadian rhythm, but may also be a temperature or even social cycle

zenith - the point of the celestial sphere which is directly overhead

zip - a compressed file format (.zip); to compress a file using a zip utility. Compression is generally used to speed up the transport of large or multiple files. After the file has been downloaded, a decompression application is needed to "unzip" it

zoanthid - an anemone of the family Zoanthidae, usually found in intertidal areas and coral reefs . In some species the polyps separate from each other almost completely after budding, while in other species, the polyps are all interconnected by a common mat of tissue

zoarium - the form of a bryozoan colony

Image of zoea larva

A zoea larva. (Photo: Marine Ecology Laboratory, Shimoda Marine Research Center, University of Tsukuba)

zoea - a free-swimming larval stage of various crustaceans

zonate - divided by parallel planes, e.g., zonate tetraspores, found in certain species of red algae

zonation - the occurrence of single species or groups of species in recognizable bands that might delineate a range of water depth or a range of height in the intertidal zone

zone - a large-scale physical feature within the ecosystem. Reef zones are determined by currents, wave surge, exposure to sunlight and water depth, and may be comprised of a number of habitats

zoochory - the dispersal of plant seeds or spores by animals. Endozoochory is zoochory within the animal's body. Exozoochory is zoochory where the seeds are attached to the outside of the animal's body

zooecium - the skeleton of a bryozoan zooid

zoogamete - a motile gamete; also "planogamete"

zooid - of the distinct individuals forming a colonial invertebrate animal, such as a hydrozoan

zooidal - pertaining to a zooid, as for example, a zooidal form

zoology - the scientific study of animal life. Zoological sciences include the studies of evolution, systematics, cell biology, biochemistry, micro and macro anatomy, development, genetics, physiology, ecology, biogeography, biodiversity, behavior and sociobiology

zoonose - a disease of non-human animals that may be transmitted to humans, or may be transmitted from humans to non-human animals

zoophyte - an invertebrate which resembles a plant in appearance or mode of growth, as for example, hard corals, sea fans, and other soft corals, sea anemones, hydroids, bryozoans, sponges, etc., especially any of those that form compound colonies having a tree-like form

zooplankton - animal component of the plankton community

zoospore - a motile, flagellated spore

zootoxin - any poisonous or venemous substance produced by an animal

Image of zooxanthellae

Zooxanthellae. (Photo: Scott Santos)

zooxanthellae - a group of dinoflagellates living endosymbiotically in association with one of a variety of invertebrate groups (e.g., corals). In corals, they provide carbohydrates through photosynthesis, which are used as one source of energy for the coral polyps. They also provide coloration for the corals

zooxanthellate coral - a coral that has zooxanthellae in its tissues

zygote - a fertilized egg with the diploid number of chromosomes formed by the union of the nuclei of male and female gametes

zymogen - an inactive precursor of an enzyme that is converted into an active enzyme by action of an acid or another enzyme or by other means; a proenzyme

zymogen cell - a cell that secretes zymogens