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- Endoskeleton
- internal skeleton, like the bony or cartilaginous skeletons of vertebrates
- Envenomation
- to sting or impregnate an organism with a toxin by means of a stinger, spine, barb, bite or poisonous tissue
- Environment
- sum of biological and non-biological factors to which an organism, population or community is subjected
- Enzyme
- a protein molecule produced by living organisms that causes a cehmical reaction to take place at a faster rate or under different conditions without itself being destroyed or altered upon completion of the reaction
- Ephyra
- immature medusae
- Epibenthic
- living on the seabed
- Erosion
- loss of soil due to water flow, especially in areas where native vegetation has been removed
- Estivate
- state of dormancy induced by high temperature; breathing and circulation slows slightly
- Estrus
- period of sexual receptivity in most female mammals during which mating and conception occur
- Estuary
- area where fresh water in the form of streams or rivers influenced by oceanic tides empties into the ocean or a coastal bay, usually forming a salt marsh
- Ethology
- study of animal behavior
- Excluder
- a plant with the ability to exclude salt from tissues, example, salty Susan
- Excretor
- plant able to excrete salt from their tissues. example, sea lavender
- Exoskeleton
- external skeleton, like the "shell" of a crab or lobster. Usually made of keratin.
- Extinct
- no longer in existence
- Fauna
- animal life of a region, special environment
- Feces
- excrement
- Feral
- individuals of a domesticated species that have returned to a wild state
- Festoon
- string
- Filamentous
- chainlike series of cells as in many algae
- Filaments
- fine or threadlike structures
- Filter feeder
- animal that eats by passing surrounding water through a filtering device and filtering or straining out small particles of food
- Fission
- form of asexual reproduction in which the parent organism divides into two or more parts, each becoming an independent individual
- Float
- gas containing structure found on the stem of large kelp that buoys up the plant; pneumatophore or pneumatocyst
- Flora
- plant life of a region, special environment, or period of history
- Flukes
- two lobes of a cetacean or dugong's tail
- Flyway
- route followed by migrating birds. There are four major north to south routes in the US.
- Food chain
- progression of feeding levels in which one organism is the food source for the next level
- Food web
- description of the interactions or complex relationships between various food levels
- Forage
- food for animals, especially when taken by browsing or grazing; to search for food
- Fossil
- hardened remains or traces of plant or animal life of a past geological period; usually preserved in rock
- Fouling
- mass of living and non-living bodies and particles attached to a submerged object
- Frond
- leaf-like structure of a plant: kelp stipe (stem-like part) and the attached blades
- Fry
- fish that have completed yolk absorption and are less than a few months old
- Fusiform
- spindle or torpedo shaped; rounded, broadest in the middle and tapering toward each end
- Gamete
- mature sperm or egg, capable of fusing during fertilization
- Gametophyte
- gamete-forming phase in alteration of plant generations
- Gastropod
- mollusks of the class Gastropoda, such as snails, slugs, cowries, or limpets, characteristically having a single, usually coiled shell or no shell at all, a ventral muscular foot for locomotion, and eyes and feelers located on a distinct head
- Generic
- relating to or determined by the origin, development, or causal antecedents of something
- Genus
- subdivision of a biological family: biological ranking between family and species
- Gestation
- period during which young are carried in the uterus
- Gill
- aquatic respiratory organ
- Gill net
- a fishing net set vertically in the water so that fish swimming into it are entangled by the gills in its mesh
- Gill rakers
- small, rod-like bony structures on the inside edge of fishes' gills that support the gills, prevent solid particles from injuring the gills and food from escaping into the water
- 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