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Bill,
I think farming practice changes had something to do with the change in behavior of the cacklers..
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Not really, and I've been covering this since 1976...At that time, farming had already largely shifted to grass seed. The additional expansion may have attracted a few more cacklers, but they were minority birds in the wintering goose populations of the valley. In fact, there weren't many other geese at all because the valley was so heavily hunted. Duskys, in fact started disappearing before the effects of the 64 quake upheaved the Copper River Delta. They were hunted too hard, so the feds bought the three refuges to control their wintering areas. Limited hunting was allowed (I shot a leg-banded dusky that year, in fact, on Finley). I interviewed Jimmy Doolittle during one of his favorite hunts on Glaser Farms near Tangent.
Once the Delta nesting crashed and duskys slumped, the state and feds enacted restrictions and for at least some years there was no hunting at all...Cacklers stopped over because they weren't shot at...older cacklers still went to Sacramento (and Modoc, as I recall), but the progeny of those stopping in the valley simply reproduced more young of their own that never knew anything but the valley...the explosion of geese occurred in less than a decade as others started stopping as well...
That's about it...I suspect some still went to California, but now a similar situation has developed in Klamath County and along the south coast (with Aleutians).
Goose populations are very volatile and adaptable (except the duskys, I guess we'd have to say, although they, too, eventually spread out of the valley and up to Sauvie and the lower Columbia).