[NAFEX] Sumac fruit question
William C. Garthright
billg at inebraska.com
Tue May 15 13:14:46 EDT 2007
> It stated that sumac fruit are eaten by birds in winter when other fruits are not available. The birds are unable to maintain weight on sumac (I presume due to limited nutrient content/availability versus the energy cost and rate of digestion) but lose weight at a considerably reduced rate compared to starvation. So we could look on sumac as an "iron ration" of last resort for winter birds.
Fascinating! Plants use different "strategies" to get their seeds
dispersed by birds. From what I've heard, fruits that are more appealing
to birds (with a high fat or sugar content?) spoil relatively quickly.
They are usually eaten quickly, but they must be, because they won't
last long anyway. Other fruits are not as nutritious, so they're not as
appealing. But that also means that they don't spoil quickly, so they'll
last all winter in good condition. When the favored fruits are long
gone, these are the only option, so they get eaten then.
I'm not going to guarantee this is correct, since it's just what I've
heard... somewhere, but it made sense to me.
The most remarkable thing about evolutionary theory is that, as the
science of biochemistry has developed, as the science of cell biology,
genetics, molecular biology, and other elements of science have
developed, all of these have fit beautifully into the general framework
described by Darwin almost one hundred fifty years ago. - Dr. Ken Miller
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