|
TAC
|
|
|
Total allowable catch. The annual recommended or specified regulated catch for a species or species group. The regional fishery management council sets the TAC from the range of acceptable biological catch (ABC). See also ABC.
|
|
taxonomy
|
|
|
The theory and practice of describing, naming, and classifying plants and animals. See also systematics.
|
|
thermocline
|
|
|
The often sharply defined boundary between surface water and deeper, cooler water.
|
|
threatened
|
|
|
According to the U.S. Endangered Species Act of 1973, a species likely to become endangered if limiting factors are not reversed. See also ESA; compare endangered.
|
|
transect
|
|
|
A straight line placed on the ground along which ecological measurements are taken. If an ecologist wanted to sample the diversity of intertidal organisms in the intertidal, transects would be placed perpendicular to the shore and samples would be taken at predetermined interval lengths. See also quadrat.
|
|
trophic
|
|
|
Concerning feeding habits, food chains, or nutrition.
|
|
trophic levels
|
|
|
The energy levels or steps in a food chain or food web.
|
|
TRT
|
|
|
Technical Recovery Team. The TRT establishes biologically based ESA recovery goals for listed salmonids within a given recovery domain. Members serve as science advisors to the recovery planning phase.
|
