Liter size is based on caloric intake and that’s it. More game for them, larger litters
Will coyotes move into empty territory? Absolutely. It could be a week, a month, or even longer.
I trap/hunt year round on several properties. I let all landowners know that the first year will be the most expensive and then it decreases every year thereafter until it stabilizes. I only get paid for what I catch and not a set fee, so it’s beneficial for me to catch everything I can.
With that said, habitat plays a role in both predators and prey. The better the habitat you have for game animals or prey, the worse it seems for predators as far as making it their home. All my properties now have great habitat and very little predators that call those areas home. Yes I’ll have the nest raiders, but most cats and coyotes are transients.
This Summer I’m concentrating mostly on nest raiders and setting less footholds for coyotes. Since I’ve gotten bit by the bug of thermal hunting I’m sorta wanting targets, lol. I get paid for dead critters regardless if I’m thermal hunting or trapping them so I’m still taking them off the properties. I’m fairly confident there’s a pair denning right near the property line and as soon as I get back from an upcoming cruise I’ll start back calling and find out.
If removing coyotes caused a population explosion, I’m pretty sure I’d be a very rich man! Unfortunately that’s just not the case. And yes, catching or shooting females prior to denning will drastically decrease their numbers for quite a while. When you can walk 2500ac and find only 2 sets of tracks that you know aren’t from the same coyote, then the numbers have been reduced. But again, it’s a yearly thing for me, so someone only trapping/hunting for fur only will see just as many numbers the next year or maybe even more.