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{"id":61951,"date":"2020-11-22T11:33:02","date_gmt":"2020-11-22T15:33:02","guid":{"rendered":"https:\/\/www.birdfinding.info\/?p=61951"},"modified":"2022-01-21T10:59:09","modified_gmt":"2022-01-21T14:59:09","slug":"tristrams-storm-petrel","status":"publish","type":"post","link":"https:\/\/birdfinding.info\/tristrams-storm-petrel\/","title":{"rendered":"Tristram\u2019s Storm-Petrel"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\u00a9 Hiroyuki Tanoi<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\nhttps:\/\/birdfinding.info\/wp-content\/uploads\/2020\/11\/XC441709-Tristrams-Storm-Petrel-Oceanodroma-tristrami.mp3<\/a><\/audio>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\u00a9 Drew Lindow<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Birdfinding.info \u21d2<\/em><\/strong>\u00a0 Locally common around its nesting islands, especially from November to May, and to a lesser extent year-round.\u00a0 Most of these sites are remote, but the Izu Islands are accessible by ferry from Tokyo and Shimodo.\u00a0 In June and July, post-breeders are often seen farther north offshore from eastern Honshu.\u00a0 In Hawaii it breeds in the Northwest Chain but has rarely been reported from the main islands, with most accepted records from February to April in offshore waters west or north of Kauai.\u00a0 A breeding colony formed by the translocation of chicks to James Campbell National Wildlife Refuge<\/strong><\/a> has shown initial signs of becoming established, which may increase viewing opportunities around Oahu.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Tristram\u2019s Storm-Petrel<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Hydrobates tristrami<\/em><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Family: Hydrobatidae<\/a><\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Breeds on offshore islands of Japan and the Northwest Chain of Hawaii.\u00a0 Disperses to the subtropical western North Pacific.<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\u00a9 Xeno-Canto 2020<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Breeding.<\/em><\/strong>\u00a0 Breeds from November to May on Japan\u2019s Izu, Torishima, Ogasawara, and Iwo Islands, and the Northwest Chain of Hawaii.<\/p>

Most of the Izu population, ~760 pairs, nests on Tadanae-jima (an islet east of Kozu-shima), with about twenty pairs on Hachijyo-kojima (an islet west of Hachijyo-jima).<\/p>

In the Northwest Chain, the largest colonies are on Nihoa (~3,000 pairs) and Laysan (~2,000).\u00a0 Also nests on Kure, Midway, Pearl and Hermes Reefs, and French Frigate Shoals, and suspected on Necker and Lisianski.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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In the main Hawaiian Islands, a new breeding colony might become established at James Campbell National Wildlife Refuge on the north shore of Oahu.\u00a0 In 2018, conservation biologists began translocating newly-hatched chicks from the Northwest Chain.\u00a0 In subsequent years, some of those individuals have returned, and eventual formation of a colony there appears likely.<\/p>

Nonbreeding.<\/em><\/strong>\u00a0 Partly resident in the vicinity of nesting islands.\u00a0 Some portion of the Japanese population disperses north to waters east of Honshu.<\/p>

Three records from California\u2014one on April 22, 2006, mist-netted at Southeast Farallon Island and at-sea observations in July 2007 and 2018 in southern California waters\u2014suggest that small numbers may wander regularly to the eastern North Pacific.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Tristram\u2019s Storm-Petrel, inexplicably in the wrong ocean.\u00a0 (Offshore from Sydney, Australia; October 9, 2000.)\u00a0 \u00a9 Tony Palliser<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Farther afield, there are exceptional records from southwestern Taiwan (July 31, 2005) and offshore from Sydney, Australia (October 9, 2000).<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Identification<\/strong><\/span><\/p>

A large, dark-brown storm-petrel with prominent blond carpal bars on the wing coverts, variably pale rump, and a long, deeply forked tail.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Tristram\u2019s Storm-Petrel, showing characteristically bold blond carpal bars and rump band.\u00a0 (Offshore from Iwo Jima, Ogasawara Islands, Japan; May 9, 2015.)\u00a0 \u00a9 Jemi & John Holmes<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Generally has the most pronounced carpal bars of any storm-petrel, but a few others are similar (especially Markham\u2019s<\/strong>, Black<\/strong>, and Swinhoe\u2019s<\/strong>; see below).<\/p>

The rump is neither white nor dark\u2014it usually appears paler than the back and tail, not as pale as the carpal bars but often close to the same tone.\u00a0 The paler area is often U-shaped, sometimes divided.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Tristram\u2019s Storm-Petrel, showing subtly blacker hood.\u00a0 (Offshore from Iwo Jima, Ogasawara Islands, Japan; May 9, 2015.)\u00a0 \u00a9 Jemi & John Holmes<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Often shows a darker, blackish hood that contrasts with paler, more grayish-brown back and warm-brown chest.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Flight is steady and stable, with wings crooked slightly at the wrist, more similar to some gadfly petrels than to most storm-petrels.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Tristram\u2019s Storm-Petrel, showing characteristically bold blond carpal bars, subtle rump band, and deeply forked tail.\u00a0 (Offshore from Hachijyo-jima, Izu Islands, Japan; April 25, 2015.)\u00a0 \u00a9 Hiroyuki Tanoi<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Tristram\u2019s Storm-Petrel.\u00a0 (Nihoa Island, Hawaii; April 12, 2016.)\u00a0 U.S. Fish & Wildlife Service<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\t\t\tVoice.<\/em><\/strong>\u00a0 On the breeding grounds at night, gives emphatic, buzzy calls, sometimes in excited accelerating series: