Novel food sources for Quiscalus
mexicanus and Cyanocorax sanblasianus in Chamela, Jalisco coast, Mexico.
Red-winged blackbirds (Agelaius phoeniceus) comprised most (24.1%) of birds seen in all three units, followed by mallards (Anas platyrhynchos) (5.6%), common grackles (Quiscalus
quiscula) (5.1%), and barn swallows (Hirundo rustica) (4.9%).
For instance, rates of range expansion in birds over extended periods can average as much as 80 km per year (Wing 1943), and Moore and Dolbeer (1989) suggested that red-winged blackbirds (Agelaius phoeniceus) and common grackles (Quiscalus
quiscula) disperse over 100 km per generation.
maculatus R 0.28 (hibrido) Pipilo fuscus R 0.09 Spizella passerina R 0.75 Melospiza lincolnii M 2.62 Junco phaeonotus R 0.28 Cardinalidae Pheucticus ludovicianus T 0.19 Pheucticus R 1.97 melanocephalus Passerina cyanea M 0.19 Passerina versicolor R 0.47 Icteridae Quiscalus
mexicanus R 5.25 Molothrus aeneus R 0.66 Icterus cucullatus M 0.09 Icterus bullockii M 0.47 Icterus galbula M 0.09 Icterus abeillei R E 0.28 Fringillidae Carpodacus mexicanus R 0.47 Loxia curvirostra R 0.09 Carduelis notata R 0.56 Carduelis psaltria R 0.37 Familia Passeridae Passer domesticus I 0.28 Medio de NOM Dist.
bonariensis sin el intento de expulsarlos, como sucede con otras aves hospederas de tordos como Quiscalus
lugubris (Gil 1984), Polioptila caerulea y Vireo atricapillus (Payne 1998).
Avian predators observed in or near shelterbelts included Cooper's hawk (Accipiter cooperi), prairie falcon (Falco mexicanus), great-horned owl (Bubo virginianus), long-eared owl (Asio otus), common grackle (Quiscalus
quiscula), loggerhead shrike, blue jay (Cyanocitta cristata) and American crow (Corvus brachyrhynchos).
1991) within iliaca and unalaschcensis, about 3 km, is consistent with other species that exhibit a lack of geographic patterns (Neigel and Avise 1993; Zink and Dittmann 1993a,b), although too few species have been studied to determine if 3 km is "high." The lack of mtDNA geographic structure over relatively large distances is typical of several passerine bird species that inhabit areas that were recently glaciated, such as common grackle (Quiscalus
quiscula, Zink et al.
The five most competent species were passerines: Blue Jay (Cyanocitta cristata), Common Grackle (Quiscalus
quiscula), House Finch (Carpodacus mexicanus), American Crow (Corvus brachyrhynchos), and House Sparrow (Passer domesticus).
The red-winged blackbird, horned lark, vesper sparrow, brown-headed cowbird, common grackle (Quiscalus
quiscula) and barn swallow (Hirundo rustica) represented 79% of the mean total bird abundance in row-crop fields (Table 2).
Evolution, phylogeny, sexual dimorphism, and mating system in the grackles (Quiscalus
Hybridization in the grackle, Quiscalus
quiscula, in Louisiana.
Bjorklund (1991) found that variance in male tail length of grackles (Quiscalus
spp., Icterinae) was too large to be accounted for by drift while variance in tarsus length was not.