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The clapper rail was formerly treated as a subspecies of the mangrove rail (Rallus longirostris). [5] The decision to treat the clapper rail as a separate species was based on the results of a molecular phylogenetic study that was published in 2013. [8] [9] [10] A cladogram based on the 2013 genetic study is as follows: [8]
Ridgway's rail then breeds (California rail subspecies) in the San Francisco Bay from mid-March through August, with peak activity in late June. [6] During this breeding season the bird density was approximately 0.1 to 0.6 individuals per acre; outside of breeding season densities decline to 0.04 to 0.40 individuals per acre. [ 10 ]
The mangrove rail was formerly considered to be conspecific with what are now the Aztec rail (R. tenuirostris), Ridgway's rail (R. obsoletus), the king rail (R. elegans), and the clapper rail (R. crepitans), and more recently as conspecific with Ridgeway's and king rails. Worldwide taxonomic systems now agree that each of the five is a separate ...
Numerous birds have been known to live on Hooks Island, such as the near-threatened California clapper rail. [10] In 2011, a Point Reyes Bird Observatory Conservation Science report found that approximately 14 clapper rails had been found in the Baylands, and 19 clapper rails were "known to exist" at Palo Alto Harbor and Hooks Island. [11]
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Ridgway's rail: Rallus obsoletus Ridgway, 1874: 18 Clapper rail: Rallus crepitans Gmelin, JF, 1789: 19 Aztec rail: Rallus tenuirostris Ridgway, 1874: 20 Mangrove rail: Rallus longirostris Boddaert, 1783: 21 King rail: Rallus elegans Audubon, 1834: 22 Plain-flanked rail: Rallus wetmorei Zimmer, JT & Phelps, WH, 1944: 23 Virginia rail: Rallus ...
The Sonny Bono Salton Sea National Wildlife Refuge is located in the Imperial Valley of California, 40 miles (64 km) north of the Mexican border. Situated at the southern end of the Salton Sea, the refuge protects one of the most important nesting sites and stopovers along the Pacific Flyway.
Most species have strong legs and long toes which are well adapted to soft uneven surfaces. They tend to have short, rounded wings and tend to be weak fliers. There are 143 species worldwide and 13 North American species. Of the 6 listed birds, the black rail is rare and local; only the clapper rail is more common in summer. All are breeding ...
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