Common sense tells me weather events and climate trends (drought) coupled with habitat quality, predation and disease are far more important factors in wildlife population trends than chemicals. There are millions of acres in Idaho, Montana and Wyoming that have never had chemical applications.......ever.
They don't have to live in an area for long. It doesn't have to be a long-term exposure to the chemicals. It could be on their way to their winter range. And the difference between those things you talk about and this, is these animals were built for those things. They've always existed, they've always been there. Predators, disease, etc. have a much greater affect when you have weak animals, with development problems, that are immune deficient. So we blame the things we can see. You can see a coyote kill a deer, so you blame the coyote, not the underlying causes as to why that deer wasn't strong enough to survive. In bighorns we blame Pnemonia, but not the reasons they ended up immune deficient and contracted the pnemonia. In moose we stand there with our hands in our pockets and just can't figure out why we can't get a handle on the populations. Maybe because we continue to blame it on the wrong things and think that by some magical way fixing the same things is going to somehow magically fix things the tenth time down the road. Pesticide use and crashes of our wildlife population are a perfect correlation, and we are we are steadying ourselves for another crash soon with the amount that are being used now.