"Preserve" is transitive only, and needs an object here. Technically, this term would not allow for any loss (or consumption) of resourses, while "conserve" means to use wisely and plan for the future. In other usages, "game preserve" is (I believe) intended to provide game for the sport (consumption) of hunters.
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Avangithis term would not allow for any loss
Avangimeans to use wiselyThe above seem to be related. Does the difference lie in "the future", meaning conserve has a sense of future which preserve doesn't?