As with any changes in the abiotic or biotic environment, an increase in overall diversity will probably be beneficial to some pre-existing species, but not others. In terms of management, one would most often focus on how this impacts keystone species, and to understand how exactly that works you need comments from people with local knowledge. Aside from keystone species, whether protected area management should promote higher biodiversity per se, is debatable. In cold-temperate regions, global warming will result in biodiversity increasing, but in altered ecosystem function, which most researchers would qualify as not desirable.

This is of course species specific, as the first replier wrote. Generally though, there is a conception that increased richness also increases ecosystem stability. This isea is only half true, but considering that the additional specis are local and were absent due to local extinctions, and are now re-establishing, it is definitely desirable

Only if biodiversity belongs to the natural ecosystem of Yellowstone, if not impossible.

It is necessary to take into account what species of plants and types of ecosystems biodiversity is increasing. If this occurs at the expense of alien species and ecosystems, where they dominate, then we believe this can not be considered as a true increase in biodiversity. Due to this, current species are expelled and current ecosystems are transformed. This we are now witnessing in the steppe zone of Ukraine. Sorry for my English

• I agree with Ivanko that what type of species are increasing. In case of alien species they will expell the native species from the ecosystems.If the native species are increasing

 agreed'

If the native species are increasing that will be beneficial to the ecosystems because there will be more competition at each trophic level. If the population of one species is decreased that will be immediately replaced by another species and thef 

Natural increase in biodiversity will have both abiotic and biotic componets in control as food chain of the ecosystem get balanced. The Human  intervention to increase the biodiversity in nay ecosystem will certainly disturb current species structure and function.

I agreed with the earlier submissions. However, a decrease in waterfowls may not necessarily be related to increasing deciduous trees. Some waterfowls are migratory and are affected by factors at broader scale. 

The increase of biodiversity is desirable in terms of native species as a consequence of the natural resilience of the ecosystem. I agree with the responses from above, that real biodiversity doesn't consider the alien species.

I agree with the above comments that true biodiversity does not account for the alien species whereas a broad scope of biodiversity may take into account ecosystem shifts for all species.  However, when considering climatic shifts, forest succession, and rebounding habitat, there is an expectation for biodiversity loss accompanying some gain in species richness.  If the gains don't accompany the losses, then there is obviously a problem.