Please Note: Due to the Desert Gala, there will be no Theater Animal Experience Fri 4/25 - Mon 4/28. The Ironwood Restaurant will close at noon on Sun 4/27. The Ironwood Gift Shop, Baldwin Gallery, and the Desert Garden will be closed all day Sun 4/27.


Migratory Pollinators Program

Table 9.
d(%) VSMOW (Vienna Standard Mean Ocean Water) of saguaro resources and surface water as a function of date sampled.  Means SE, and sample sizes (n) are presented.  An asterisk denotes the onset of summer monsoon rains.  Note that surface water enriches in dD slightly as a result of evaporative fractionation before the onset of monsoon rains.  After rains, the composition of surface water approaches that of rainfall.  The temporal variation in isotopic composition in both saguaro resources and rainwater is small relative to the turnover of the deuterium pool in doves.  However, the use of deuterium as a resource tracer for saguaro consumption requires monitoring the composition of both sources.

          

Nectar

Fruit

        

5/24/98

6/11/98

6/20/98

7/20/98

8/20/98

Saguaro

19.6 3.3

26.4 3.2

47 3.1

50.5 2.3

41.3 3.5

(9)     

(13)

(17)

(47)  

(19)

Surface Water

-22.4   

-20.2

-18.8

-34.1     

-36.2

 

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