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The Arizona-Sonora Desert Museum will re-open at 11 a.m. today. While the source of water loss is still unknown, water is flowing into, and collecting properly, in the Desert Museum’s reservoir. Food service will be limited to pre-packaged items for the remainder of the day. All other activities are back on the normal schedule. Thank you.

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.











19.6 3.3

26.4 3.2

47 3.1

50.5 2.3

41.3 3.5






Surface Water







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