T-2 



THERMOCLINE 

 (Mesolimnion, 

 Metalimnion) 



The transition zone between the warm epilimnion 

 and cold hypolimnion of stratified bodies of 

 water; temperature change equals or exceeds 

 1°C for each meter of depth. (See Thermal 

 Stratification) 



THRESHOLD 

 (Critical Level) 



The maximum or minimum duration or intensity 

 of a stimulus that is required to produce a 

 response in an organism. 



TIDAL FLAT 



The sea bottom, usually wide, flat, muddy and 

 nonproductive, which is exposed at low tide. A 

 marshy or muddy area that is covered and 

 uncovered by the rise and fall of the tide. 



TIDAL MARSH 



A low, flat marshland that is traversed by 

 interlacing channels and tidal sloughs; 

 periodically inundated by high tides; vegetation 

 consists of rushes, grasses, and other salt 

 tolerant plants. 



TIDAL ZONE 

 (Eulittoral Zone, 

 Intertidal Zone) 



The area of a shore between the limits of 

 water level fluctuation; the area between 

 the levels of high and low tides . 



TIDE 



The alternate rising and falling of water 

 levels, twice in each lunar day, due to 

 gravitational attraction of the moon and sun 

 in conjunction with the earth's rotational 

 force. 



TL* (TL 50 ) 



(Median Tolerance Limit) 



