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| Passerina cyanea | |
|---|---|
| Name | Indigo Bunting |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Passerina |
| Species | cyanea |
| Authority | (Linnaeus, 1766) |
Passerina cyanea is a small migratory songbird in the cardinal family known commonly as the indigo bunting. It is widely recognized by ornithologists and birdwatchers across North America, where it functions as a model species in studies by institutions and researchers investigating migration, plumage, and breeding behavior. Museum collections, field guides and conservation organizations document its range and life history.
The species was described by Carl Linnaeus in the 18th century and is placed in the genus Passerina (bird), within the family Cardinalidae, a grouping examined by taxonomists at institutions such as the Smithsonian Institution, American Museum of Natural History, and Royal Society. Molecular phylogenetic work published by teams affiliated with Harvard University, University of Kansas Natural History Museum, and University of Minnesota has revised relationships among Cardinalidae genera, comparing DNA sequences to those from taxa studied at Cold Spring Harbor Laboratory and reported in journals like Science and Proceedings of the National Academy of Sciences. Historical treatments in compendia such as the works of John James Audubon and the Handbook of the Birds of the World contrast with modern revisions by researchers associated with the American Ornithological Society and the International Ornithologists' Union.
Adult males in breeding plumage exhibit vibrant indigo-blue coloration first noted in plates by John James Audubon, while females display brown streaked patterns, a point of comparison in field guides published by Cornell Lab of Ornithology, Roger Tory Peterson, and the National Audubon Society. Morphological metrics—wing chord, tail length, bill dimensions—are routinely measured in ringing studies at stations such as Long Point Bird Observatory, Point Pelee National Park, and Montréal Biodôme by researchers affiliated with Bird Studies Canada. Plumage pigmentation has been the subject of biochemical analyses conducted at laboratories including University of California, Berkeley and University of British Columbia, and referenced in textbooks from Cambridge University Press and Oxford University Press. Vocalizations are cataloged in collections at Macaulay Library and examined in acoustic studies by teams at University of Washington and Cornell Lab of Ornithology.
The species breeds across much of the eastern and central United States and southern Canada, areas surveyed by programs such as the North American Breeding Bird Survey, Partners in Flight, and provincial agencies like Ontario Ministry of Natural Resources and Forestry. Wintering grounds span Mexico, Central America, and northern South America with records curated by organizations including BirdLife International, CONABIO in Mexico, and national parks like Sierra de Bahoruco National Park and El Yunque National Forest. Habitats include scrub, edge, and young successional fields noted in ecological assessments by US Fish and Wildlife Service, National Park Service, and state departments such as Texas Parks and Wildlife Department. Migration stopover usage has been documented at coastal sites like Cape May, Monomoy National Wildlife Refuge, and Point Reyes National Seashore.
Males establish song perches and territories, behaviors analyzed in field studies conducted by researchers at Duke University, University of Michigan, and Brown University. Migratory connectivity and navigation have been investigated using tracking methods developed at Max Planck Institute for Ornithology and projects supported by the National Science Foundation and NSF Graduate Research Fellowship Program. Interactions with predators and parasite loads have been studied by teams at Yale University and University of Florida, and interactions with interspecific competitors are reported in community ecology surveys published in Ecology and The Auk. Seasonal timing aligns with photoperiod responses explored in laboratories at Arizona State University and University of Wisconsin–Madison.
Nesting behavior, clutch size, and parental care are documented in long-term studies by institutions such as University of Illinois, University of Nebraska–Lincoln, and the Cornell Lab of Ornithology NestWatch program. Territory establishment and mate selection have been compared to patterns described by behavioral ecologists at Princeton University and University of California, Los Angeles. Hybridization events with congeners have been examined in genetic surveys by teams at University of Texas at Austin and in reports to the American Ornithologists' Union nomenclature committees. Ringing and demographic analyses by British Trust for Ornithology collaborators and North American banding labs provide survival rate estimates used in conservation planning by agencies like US Geological Survey.
Foraging primarily on seeds and insects, dietary studies reference collections and analyses by researchers at Smithsonian Institution, Field Museum of Natural History, and agricultural research from USDA Agricultural Research Service. Seasonal shifts from invertebrate-rich diets during breeding to seed-dominated winter diets are reported in studies funded by National Institutes of Health and published in journals such as Journal of Avian Biology and The Condor. Feeding behavior in agricultural landscapes has been assessed by extension services like University of California Cooperative Extension and Penn State Extension.
Classified as Least Concern by IUCN assessments, population trends tracked by the North American Breeding Bird Survey and NGOs including Audubon Society and BirdLife International show regional changes prompting habitat management recommendations by US Fish and Wildlife Service, Nature Conservancy, and state wildlife agencies. Threats include habitat loss documented in reports by Environmental Protection Agency, pesticide exposure examined by researchers at University of California, Davis, and collisions during migration analyzed in studies by American Bird Conservancy. Conservation measures promoted by programs such as Partners in Flight and local land trusts aim to preserve early successional habitats through practices advocated by Natural Resources Conservation Service and community groups.
Category:Cardinalidae