. The ecology of Tijuana Estuary, California : a national estuarine research reserve . Tide: LHLHLHLHLHLH Day: 7 14 22 29 5 12 20 27 4 9 15 24 Month: October November December Figure Variability in bird use by tidal condition. Data are numbers of individuals observed during low (L) and high (H) tides, by category of bird, showing that both the numbers of birds and the types of birds show temporal variation. Data are from Kus and Ashfield (1989). 67

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity