Actually, the best indicator of standing population dynamics is the August brood survey. Number of hens observed as well as number of hens who successfully reared poults to sub adulthood will let you know where you are headed for the next year.
For some reason, more and more hens are not raising poults. Overpopulation and subsequent decline to normalcy? Nest predators increasing? Poult predators increasing? Adult predators increasing in efficiency in their hunting methods? Disease? Hunting season interfering with breeding and fertilizing hens? Overharvesting of males prior to breeding? Hens not even initiating a nest? Weather killing poults after they hatch? Something is going on keeping us from hitting the 4 poults per hen magic number for population to expand. Heck, we can't even scratch the 2.2 pph average to maintain current population numbers.
We as hunters are naturally conservationists, in that we want to ensure turkeys stay a renewable resource to enjoy year after year. The gradual (and sometimes rapid) decline in many areas of the state is more than alarming for those of us who have experienced the decline. For those who have not, your day is coming.
So... what can we do? Probably nothing. At least not until we figure out why hens are not rearing poults. It makes us feel better to declare war on nest predators, adult predators, and spread out our kills over a large area and defer those we do kill to a later date in the season. Maybe even kill fewer of the standing males in the population. And those things may make a tad of a difference, they will certainly slow the decline, but I'm not sure they will make a difference 25 years from now.
Sorry to sound so dismal, but our lack of understanding why so many hens simply are not rearing poults does not give me much hope for the future of turkeys. A spring without gobbles would be even more sad than a spring or early summer without hearing the bobwhite. And that has happened already. And the grouse... and those 2 species are incredibly similar to turkeys.
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