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 spp.: Icterinae).
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.
Quiscalus - grackles