000			019320000a22003130004500
904			_aBCO
905			_aC
908			_aJ
909			_aAS
914			_aFORES
082	0	4	_a41274
100	1		_9132235 _aWRIGHT, S.J.
100	1		_959036 _aCORNEJO, F.H.
260			_c1990
520			_aPeak rates of leaf fall almost always occur during dry seasons in low-latitude, low-elevation tropical forests. The hypothesis that plant water stress is the proximal cue for leaf fall was tested by augmenting water supplies during the 4-mo dry season over two 2.25-ha plots of tropical moist forest on Barro Colorado Island (BCI) Panama. The manipulation mainteined soil water potentials at or above field capacity throughout the dry season but did not affect atmospheric conditions in the canopy (i.e. relative humidity, temperature, windspeed, incident radiation). The manipulation ameliorated plots were similar to wet-season values and both were consistently greater than dry-season values in the control plots. The manipulation delayed leaf fall for 2 or 9 species of trees and lianas for which quantitative data are available. The timing of leaf fall was indistinguishable in manipulated and control plots for the remaining 25 species. We conclude that plant water status is rarely the proximal cue for leaf fall on BCI. Atmospheric conditions may be important for some species, but there is no reason to presuppose that a majority of tropical plants are responsive to any single cue
650	1	4	_9144885 _aDOSEL
650	1	4	_9167494 _aTROPICO HUMEDO
650	1	4	_9147746 _aFENOLOGIA
650	1	4	_927701 _aPANAMA
691			_9158293 _aPHENOLOGY
691			_927701 _aPANAMA
692			_aPHENOLOGIE
692			_aPANAMA
773	0		_tEcology (EUA) _d1990 _gv.71(3) p.1165-1175
040			_aCR-TuBCO _cCR-TuBCO _bEs
245	1	0	_aSeasonal drought and leaf fall in a tropical forest
942			_cANA
003			CR-TuBCO
999			_c55049 _d55049