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- GIS
- Geographic Information System: a system of hardware and software used for storage, retrieval, mapping, and analysis of geographic data.
- Gonads
- male and female reproductive organs
- Gonopore
- opening through which eggs or sperm are released, especially in invertebrates
- Gravid
- pregnant; bearing eggs or young
- Grazers
- animals that eat growing herbage, attached algae, or phytoplankton as their principle source of energy
- Gregarious
- tend to live in groups; social
- Habitat
- environment in which a plant or animal lives; its home
- Halophytes
- plants that can grow in soils with a high salt content
- Haustoria
- slender portion of leaf or stem modified for twinning; a tendril
- Hectocotylus
- one of arms of most male cephalopods such as an octopus that is modified to transfer spermatophores from a male to a reproductive female
- Hemoglobin
- iron-containing pigment in red blood cells that conveys oxygen to tissues
- Herbivore
- animal adapted to subsist solely or mainly on plant food
- Home range
- area in which an animal lives
- Homoeothermic
- warm-blooded; body temperature controlled internally and maintained at a constant level; endothermic
- Hydra
- small jelly animals with a polyp form that are found only in fresh water; colonies are shaped like feathers or very small trees
- Hydrodynamics
- branch of physics that studies fluids in motion and the forces that affect motion
- Hydroid
- colony of polyps growing on a common stalk; found only in salt water; form colonies shaped like feathers or very small areas
- Hydromedusae
- small jellies usually less than 25mm (1 in)
- Hydrophone
- microphone submerged in water
- Hydrozoan
- class of Phylum Cnideria that includes hydroids, hydra, and the Portuguese man-of-war
- Ichthyologists
- zoologists who study fishes
- Ichthyoplankton
- planktonic fish larvae and suspended fish eggs
- Incurrent
- pertaining to a current that flows inward
- Indicator species
- a species whose presence, absence, or relative well-being in a given environment is indicative of the health of its ecosystem as a whole
- Indigenous
- native to a particular region or environment
- Indirect development
- having a larval stage of development
- Inert
- unable to move or act
- Infanticide
- killing of young
- Inorganic
- being or composed of matter that is not plant or animal
- Insectivore
- animal that primarily eats insects
- Intertidal
- the zone between high and low tides, exposed to and flooded periodically by tides.
- Invertebrate
- animals with no dorsal column of vertebrae; without a backbone
- Iridescent
- having or displaying rainbow-like colors
- Iridocyte
- cells or tissue containing reflective material, e.g., reflective cells on fishes' scales
- Isopod
- any member of the Order Isopoda of aquatic crustaceans; has six pairs of legs and a flat oval body
- Keeled
- peak running lengthwise along the centerline, resembling the keel of a boat
- Kelp
- dense temperate algae; any of the large brown seaweeds
- Keratin
- fibrous protein in skin, nails, hair, baleen of whales; contains large amounts of cystine
- Krill
- shrimp-like crustacean
- Lampara net
- a surrounding net with the center bagging part in the form of a spoon and two lateral wings, making it possible to retain the shool of fish when the two wings are hauled up at the same time.
- Lappet
- lobes around margin of the bell of most true jellies
- Larva
- immature stage of an animal that must metamorphose before assuming adult form and characteristics
- Larvae
- immature stage of an animal that must metamorphose before assuming adult form and characteristics
- Lateral line
- sensory canal system running along the flanks (sides) of most fishes and some amphibians that detects water movement, disturbances and vibrations
- Leach
- to remove unwanted parts of a substance by a percolating or filtering liquid
- Littoral
- intertidal zone along or on the coastline or shore
- Locomotion
- act of moving; the ability to move from place to place
- Macrophyte
- any large living marine plant such as algae, sea grasses, mangroves
- Madroporite
- sieve-like button-shaped process on top surface of Echinoderms that serves as the external opening of the water vascular system
- Mammal
- any member of the Class Mammalia; warm-blooded, have hair, have live births, nurse their young, breath air, have a 3 part inner ear structure; e.g., whales, bears, humans
