Topic
Supercilium
About: Supercilium is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 1 citations.
Papers
1 Jan 2006
TL;DR: The southernmost record of the Vermivora peregrina was reported in Chile by Gajardo et al. as discussed by the authors, where they were trapped in a mist net and released after taking voucher photographs.
Abstract: 8 Tennessee Warbler Vermivora peregrina is a Nearctic species that breeds widely across northern North America, from southern Alaska to central Quebec and southern Labrador, and south to the northern USA, and winters from southern Mexico to northern South America2,6,12,13,15. Ridgely & Greenfield11 reported that since 1980 a few individuals have appeared with some regularity in northern Ecuador between October and March, and the species was recently recorded as far south as prov. Loja9. Accidentals have reached the Faeroe Islands, Greenland and Great Britain3 4. When breeding, Tennessee Warbler inhabits deciduous and open-mixed forests, brushy slopes, and coniferous forests, but in winter prefers semi-open and secondary forests, plantations and gardens. In addition, its summer diet of insects changes to fruits and nectar in the Neotropics3. Here we report the southernmost record of this species, in northern Chile, c.2,000 km south of its previously recorded range. On 17 November 1996, during a bird survey in Putre (Tarapaca, 18°11’S 69°33’W; 3,500 m), one was trapped in a mist-net and released after taking voucher photographs (Fig. 2). The area comprises pre-Andean brushy steppe (sensu Gajardo5 , see also Stattersfield et al.14), rocky ravines with dense brush dominated by Fabiana densa, Ephedra breana, Atriplex imbricata and Baccharis boliviensis. In some ravines, the abundant Solanaceae Dunalia spinosa, with fruits and flowers rich in nectar, attracts many birds. In the nearby town are several eucalyptus (Eucalyptus globulus) and cypress (Cupressus macrocarpa) trees. The Tennessee Warbler was identified using Dunn & Garrett4 and by comparing photographs with specimens in the collections of the Zoological Museum, University of Copenhagen, and The Natural History Museum (Tring). Tennessee Warbler is olive-green above, the head greyish with a grey ocular streak and a pale supercilium; the underparts vary from whitish to pale yellow or olive on the throat; the breast and undertail-coverts are whitish. The bird at Putre had the following characters: upperparts olive-green, a yellowish supercilium and narrow grey ocular ring, throat and breast pale yellow, whitish abdomen and undertail-coverts, wings olivaceous with narrow yellow wingbars (tips to the median and greater wing-coverts), and primaries with small white tips (Fig. 2). This description corresponds with a first basic plumage of either sex4. Tennessee Warbler differs from the similar Orange-crowned Warbler V. celata in having a longer primary extension and a relatively short tail with white (vs. orange) undertail-coverts. Also, warblers of the genus Vermivora have fine, sharply pointed bills that differ somewhat from Dendroica, Basileuterus and other potentially confusing warbler genera. Northern migrants such as Blackpoll Warbler Dendroica striata, Summer Tanager Piranga rubra, Bobolink Dolichonyx oryzivorus and Northern Oriole Icterus galbula have all been recorded just once in Chile1,10,16, but others such as American Redstart Setophaga ruticilla, observed a few years ago for the first time in Arica, have appeared more frequently, and are regularly observed during the austral summer in Putre7 in the same area as the Southernmost record of Tennessee Warbler Vermivora peregrina, in Chile
1 citations
1 Jan 2000
TL;DR: On the morning of 17 January 1998, SGM and CH visited Tanjong Karang, Malaysia, in search of shorebirds, and were on their way back to the car when a movement among the mangrove roots caught SGM's eye and CH's eye, and both instantly recognized the bird as a Dusky Phylloscopus fuscatus/ Radde’s P. schwarzi type warbler.
Abstract: On the morning of 17 January 1998, we visited Tanjong Karang, Malaysia, in search of shorebirds. We were on our way back to the car when a movement among the mangrove roots caught SGM’s eye. We both instantly recognized the bird as a Dusky Phylloscopus fuscatus/ Radde’s P. schwarzi type warbler. SGM had never seen a member of this group, and CH had seen only one Dusky in California, though both of us had some experience with other Phylloscopus warblers, such as Arctic P. borealis. We remembered that Dusky, but not Radde’s, was on the Malaysian list as a vagrant (Strange and Jeyarajasingam 1993). Thus, our initial assumption was that this bird was a Dusky. Fortunately, we both recalled a number of marks that distinguished Radde’s from Dusky but couldn’t remember which mark matched which species so we had no preconceived notions. The bird before us was about the size of an American wood warbler. Its back was uniform olive and the cap was similar in colour. The tail was generally similar in colour, and rump pattern/colour was not noted. The wings were also olive and lacked wing-bars or contrasting tertial tips. Above the eye was a prominent pale supercilium but, unfortunately, we did not note the precise colour or pattern. The eyeline was dark, but the loral pattern was not noted. In not carefully noting these features, we failed. However, we did carefully observe the underparts pattern and the bare parts. Notably, the bill was short but stout. Its colour was mostly fleshy pink with a dusky tip. The legs were quite bright fleshy pink. The underparts were in general dull yellowish buff, but the colour became more intense towards the rear with the posterior flanks being bright ochreous buff and the undertail coverts fairly bright yellow. The throat was more whitish than the rest of the underparts and was unstreaked. Finally, the bird did us the favour of calling repeatedly. The call was a soft chup. The bird never went more than five feet up into a mangrove. We watched the bird for five or more minutes at about 50 feet through 10x Swarovski and Zeiss binoculars. The sun was fairly high and mostly to our backs. As we walked back to the car, we reviewed our observations and committed them to memory without consulting a book. We were still operating under the assumption that this bird was a Dusky Warbler, but we remarked on how insipid this bird’s call note was. We had both remembered Radde’s Warbler Phylloscopus schwarzi: a new species for Peninsular Malaysia
Performance Metrics
| Year | Papers |
|---|---|
| 2006 | 1 |
| 2000 | 1 |