[pvaldes]

Is a legit concern, but biodiversity does not work like that.

To start, predators block the spreading of diseases that would kill its preys.

Wolves will also reduce the amount of common preys, creating opportunities for the less common preys, will reduce the number of small predators and probably exile them to the frontiers of its territory, will boost tree grow, and will create new temporary ecosystems based on carcasses.

This last can seem gross, but it sustain thousands of invertebrates and help raptors and small vertebrates to survive winter

[naravara]

The comment you're addressing seems like an ecosystem equivalent to what economists call the "lump of labor fallacy." https://en.wikipedia.org/wiki/Lump_of_labour_fallacy

"Lump of biomass" fallacy might be a name for it.

As for the carrion bit, apparently when they returned wolves to Yellowstone, it wasn't just the invertebrates and raptors. Even the bears started putting on weight because the wolves were surplus hunters and would leave a lot of meat lying around for the bears to scavenge before winter.