Greg, I propose that your query be rephrased as "patterns" rather than "strategies", because "strategies" infers teleology, somewhat akin to design in evolution. I doubt that you hold the view that evolution is driven by design.
I wonder if homeostasis would be mechanism enough on which to base patterns.
Possibly there are evolutionary reversions to former niches which may compensate the climate changes: in life cycles, in epigenetic morphology and physiology of individual species, but surely not in ecosystems as a whole. Concerning "systems" the talk may be not about ecosystems, but about "host-parasite" associations with reversions which may be considered as the anticipatory scenarios of reactions to the environment changes.
More than 50% of species on this planet are parasites of some sort, so it would not be a trivial matter if this was restricted to host-parasite systems. However, this Is a general feature of Darwinian evolution, not just of host-parasite systems - stored history of successful coping with previous environmental conditions gives evolutionary systems the appearance of anticipatory adaptive behavior when those conditions recur. Biological systems are not intentionally anticipatory but they are extensionally so. This is another way of making the same argument Ales made. This capacity of each species on the planet allows ecosystems to show great flexibility in the face of climate change, in fact greater flexibility than they would have if they were super-organisms.
I agree with Daniel. Thus part of assiciates for the species may be historically-phylogenetically based, and another group of non-regular associates may be considered as an attempt of extension of the species capacity in ecosystem resources. Possibly only the first group of associates may have any predictive) anticipatory( value., because they may be predicted from the phylogeny