At Avenue G Ponds west of White City this morning the male Great-tailed Grackle was ina tree proclaiming his supremacy. His mate was foraging in the marsh nearby. They are vanguard of the latest avian invasion from the south as Jackson County’s avian population continues to gather new species coming up from California.
The combination of heavy human-caused habitat change and climate change are making southern Oregon evermore comfortable for some adaptable species, mostly from California. The grackles began their invasion from the southwest a couple decades back.
AVIAN DISTRIBUTION EVOLUTION
JACKSON COUNTY, OREGON
Some highlights of changes in local bird populations since 1975 and the publication of “The Distribution and Occurrence of the Birds of Jackson County, Oregon.”
Canada Goose 1975: “very common to uncommon migrant and winter resident”
Now: abundant year-round resident
White-tailed Kite: 1975: no record
Now: breeding resident in grasslands where voles are plentiful
Red-shouldered Hawk 1975: no record
Now: common breeding, permanent resident in several habitats
Wild Turkey 1975: no record; later introduced
Now: abundant breeding resident in oak and deciduous forest
Eurasian Collared-Dove 1975: not present anywhere in North America until 1980s
Now: now abundant residents in low elevation manmade habitats
Burrowing Owl 1975: “formerly bred throughout the county”
Now: rare wintering bird
Barred Owl 1975: no record
Now: present as breeding population in some suburban areas
Anna’s Hummingbird 1975: “rare winter visitor and a regular uncommon summer visitor”
Now: year-round resident (males) and common low elevation breeder
Black Phoebe 1975: “rare regular summer resident”
Now: year-round resident in riparian habitat
Horned Lark 1975: “fairly common permanent resident in the White City area”
Now: rare visitor
Purple Martin 1975: “formerly nested in dead snags on the shore of Hyatt Reservoir until the snags were removed about 1960.”
Now: being encouraged to nest around Denman WMA
Starling 1975: arrived in 1954
Now: one of the most abundant birds in Jackson County
Great-tailed Grackle 1975: no record
Now: summer breeding bird at Denman WMA, first Christmas Count record in Medford, 2014.
Ken Denman WMA–Ave. G Ponds, Jackson, US-OR
Apr 29, 2015 10:10 AM – 10:55 AM. 14 species
Canada Goose (Branta canadensis) 16
Gadwall (Anas strepera) 4
Mallard (Anas platyrhynchos) 20
Northern Shoveler (Anas clypeata) 1
Green-winged Teal (Anas crecca) 2
American Bittern (Botaurus lentiginosus) 1
Red-tailed Hawk (Buteo jamaicensis) 1
Sora (Porzana carolina) 1
Barn Swallow (Hirundo rustica) 20
Savannah Sparrow (Passerculus sandwichensis) 15
Song Sparrow (Melospiza melodia) 6
Red-winged Blackbird (Agelaius phoeniceus) 60
Western Meadowlark (Sturnella neglecta) 15
Great-tailed Grackle (Quiscalus mexicanus) 2
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