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| Passerina caerulea | |
|---|---|
| Name | Passerina caerulea |
| Genus | Passerina |
| Species | caerulea |
| Authority | (Linnaeus, 1766) |
Passerina caerulea is a North American songbird known for its distinctive plumage and association with open habitats. It is frequently noted by ornithologists, birdwatchers, and conservation organizations for its role in scrubland and edge ecosystems. Historical naturalists, contemporary researchers, and a range of museums and universities have documented its morphology, vocalizations, and breeding biology.
The species was described during the period of Linnaean taxonomy and has been treated in works from the Royal Society and the Linnean Society of London to modern checklists produced by the American Ornithological Society. Its placement in the genus Passerina is supported by comparative studies cited by institutions such as the Smithsonian Institution, the Natural History Museum, London, and the American Museum of Natural History. Molecular phylogenies published by researchers affiliated with Harvard University, Cornell University, and the University of California, Berkeley have refined relationships among Cardinalidae, resolving affinities with genera discussed at conferences held by the Wilson Ornithological Society and the Society for the Study of Evolution. Nomenclatural history appears in catalogs from the British Museum (Natural History), the Academy of Natural Sciences of Philadelphia, and the collections of the Muséum national d'Histoire naturelle.
Adult males exhibit blue and slate hues noted in field guides by authors associated with the Audubon Society, National Geographic Society, and the Royal Ontario Museum. Descriptions in checklists from the American Birding Association and identification treatments by the Cornell Lab of Ornithology compare plumage with species treated in the works of John James Audubon and illustrated plates from the Biodiversity Heritage Library. Morphometric data have been measured in studies from the United States Geological Survey and the Canadian Wildlife Service, and specimens are curated at the Field Museum and the Peabody Museum of Natural History. Vocal descriptions appear in song archives maintained by the Macaulay Library and recordings used by educators at the British Trust for Ornithology and the Xeno-canto project.
Range maps produced by the Audubon Society, the Cornell Lab of Ornithology, and the National Audubon Society show primary occurrence in the southeastern United States, with seasonal movements documented by researchers at the United States Fish and Wildlife Service and universities including University of Florida, Florida State University, and Louisiana State University. Habitat associations with scrub, brush, and edge environments are discussed in land-use studies conducted by the United States Department of Agriculture, habitat restoration projects coordinated by the Nature Conservancy, and regional conservation plans from agencies such as the Florida Fish and Wildlife Conservation Commission. Observational records are archived in citizen-science databases supported by eBird, BirdLife International, and regional societies like the Georgia Ornithological Society.
Foraging behavior, territoriality, and flocking patterns have been included in behavioral syntheses found in monographs from the American Ornithologists' Union and papers presented at meetings of the International Ornithological Congress. Studies of diet reference work by ecologists at the Smithsonian Tropical Research Institute and the University of Georgia, and ecosystem interactions appear in research funded by the National Science Foundation and reported through the Ecological Society of America. Predator-prey interactions and parasitism are documented in publications from the Wildlife Society and the Royal Society of London’s journals. Seasonal movement and vagrancy have been noted in reports from the Canadian Geographic editors and the Texas Parks and Wildlife Department.
Breeding biology, clutch size, and nesting phenology have been detailed in field studies by researchers at Tulane University, Auburn University, and the University of Mississippi, and summarized in breeding bird atlases published by the Cornell Lab of Ornithology and regional groups like the Carolina Bird Club. Nest descriptions and parental care behaviors are included in species accounts maintained by the Seabird Group and documented in long-term studies supported by the National Audubon Society and the Vermont Center for Ecostudies. Lifespan records and banding results are archived by the United States Geological Survey Bird Banding Laboratory and referenced in demographic analyses appearing in journals associated with the Society for Conservation Biology.
Status assessments have been prepared by organizations such as BirdLife International, the IUCN Red List partners, and national agencies including the United States Fish and Wildlife Service and the Canadian Wildlife Service. Habitat loss, fragmentation, and fire-suppression impacts are discussed in environmental assessments by the Environmental Protection Agency, conservation plans by the Nature Conservancy, and landscape-scale studies from the United States Forest Service. Mitigation efforts and habitat management guidelines have been promoted by NGOs like the Audubon Society and collaborative initiatives involving the National Park Service and state wildlife agencies.