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Post by sebbe67 on Apr 24, 2005 12:10:40 GMT
this is a subspecies of the highly endangered Juan Fernández Firecrown, this subspecies were only known from Isla Alejandro Selkirk, but it hasent been recorded from that island since 1908. Goats and climate chanhe wiped out this bird
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Post by Deleted on Apr 24, 2005 16:07:58 GMT
Hi ! I'm sorry if I may boring You, but is this information from theese HBW-books ? Its indeed right, but how could You find it out so easy ? Did You just serv around in the internet or how did You found it ? Tell me Your secret, please.  Bye Alex |
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Post by sebbe67 on Apr 24, 2005 16:12:01 GMT
take a look at birdlifes factsheet about this hummingbird I have found the information there and in the HBW book volume 5, its just that easy |
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Post by Deleted on Apr 24, 2005 16:13:48 GMT
Hi !  s h i t, I have not enough time to look on such sites. And theese poor animals die out to fast !!! |
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Post by Deleted on Apr 25, 2005 10:31:44 GMT
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Post by another specialist on Jun 9, 2005 6:30:43 GMT
This info is on the whole species aswell not just on this subspecies info found by sebbe67 Justification This species has an extremely small range and population, restricted to a single area on a small island, where habitat loss and predation are causing continuing declines. It consequently qualifies as Critically Endangered. Family/Sub-family TROCHILIDAE Species name author (King, 1831) Taxonomic source(s) Sibley and Monroe (1990, 1993), Stotz et al. (1996) Identification 13 cm. Entirely rufous hummingbird. Male bright rufous-orange, with dusky flight feathers. Reddish-yellow crown, generally appearing dark. Dusky lores. Immature male has rufous spotting on crown. Female dark green above, with bluish tinge on crown. Whitish underparts, densely spotted dark green on throat, extending on to flanks. Similar spp. Female Green-backed Firecrown S. sephaniodes is smaller, paler green and not so densely spotted on throat, with white postocular spot. Population estimate Population trend Range estimate (breeding/resident) Country endemic? 200 - 400 decreasing 11 km2 Yes Range & population Sephanoides fernandensis is endemic to the Juan Fernández Islands, Chile, where the nominate race is confined to c.11 km2 on Isla Robinson Crusoe. The race leyboldi is believed extinct on Isla Alejandro Selkirk, where it has not been recorded since 1908. Historical records indicate that densities on Robinson Crusoe were formerly much greater than the 684 individuals (varying between 804 birds in the austral summer and 445 in autumn) estimated in 1988-1989. Surveys in 1995-1997 indicated that the population is in the low hundreds2. Ecology It inhabits remnant native forests, but also feeds on introduced plants, such as Eucalyptus sp. and garden flowers, especially in the austral autumn and winter when only one native species (Raphithamnus venustus) flowers2. It is mostly nectarivorous, but small insects are taken from leaves or in flight. The sex ratio is heavily skewed, with three males to every female2. Threats The clearance and degradation of vegetation by humans and herbivorous mammals (especially rabbits) since the 16th century has limited the availability, quantity and quality of food resources. Introduced predators, such as rats, cats and coatis, have been implicated in the mortality of some birds2,4. During its nocturnal torpor, this species is presumed to be very vulnerable to predation4. Males are able to defend territories with highly productive resources, but the smaller females are possibly being indirectly outcompeted by S. sephaniodes2. Preliminary analyses of the population have revealed some genetic variation, but significantly less than in S. sephaniodes2. Conservation measures underway CITES Appendix II. The Juan Fernández Islands were designated as a national park in 1935 (protected from 1967) and a biosphere reserve in 1977. The Chilean government began restoring habitat in 19973, and the islands have been nominated for World Heritage listing1. Conservation measures proposed Monitor the population. Remove all introduced mammals, initially within an intensively managed, fenced, feasibility study area2. Replant native flora (including a 10 ha plot with shrubs that flower throughout the year), initially within the feasibility study area but also at forest edges2. Enforce grazing restrictions on national park land2. Establish feeding stations in native forest. Replant fast-growing, soil-binding trees along highly eroded slopes for short-term relief2. Implement systematic introduced plant control zonally2. www.birdlife.net/datazone/species/index.html?action=SpcHTMDetails.asp&sid=2021&m=0 |
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Post by another specialist on Jun 9, 2005 6:32:59 GMT
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Post by another specialist on Jun 9, 2005 6:38:10 GMT
The two principal islands of Juan Fernandez's Archipelago, Robinson Crusoe and Alejandro Selkirk, distant one of the other some 93 miles, possess each one a subespecie of a gender of hummingbird that they are not represented anywhere else of the world. It is evident that these two races derive from one only species, but it interesting would be known how and when arrived to be established this species in these islands, separated 400 mi. from the coast and in what part had its origin, because its coloration is totally different from any hummingbird that live in the continent. These two islander subespecies present a real example of sexual dimorfism, since in both cases the males are dark red brick color all over the body, and both females are brilliant green above and white below. Moreover, the long of the wings is greater in a 20% in the males with respect to the females. The red color of the male also serves to distinguish it of the Green-backed firecrown (Sephanoides (sephanoides) galeritus), that live in Robinson Crusoe island, but not in Alejandro Selkirk island. The separation in two different subespecies of these hummingbirds was by the work of Leybold, naturalist that in 1869 brought exemplaries to the continent and that then they were examined in the British Museum, demonstrating to have sufficient differences for separate them in two subespecies. For the analysis of the birds, the Alejandro Selkirk island's subspecies (S. f. leyboldi), it is difference of the typical race (S. f. fernandensis) only by continuing the golden colour of the crown of the males until the back neck; and, in the case of the females, because they have the back and chest and abdomen spots golden green instead of brilliant green. Naturally, these differences are not sufficient as for can to differentiate them to simple sight in its wild habitat. Also Bäckströmm, swedish naturalist who visited the island in 1917, noted that the red colours of the male and green of the female were varying between the birdsr, what could mean that reality would be only one species. www.avesdechile.cl/001en.htm |
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Post by dysmorodrepanis on Jun 21, 2005 20:11:41 GMT
No, the picture is of the nominate. But there was not much difference between the 2 subspecies anyway.
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Post by another specialist on Jun 21, 2005 21:23:20 GMT
So what were the exact differences that make the pic the nominate race and not the extinct?
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Post by Melanie on May 13, 2012 21:36:31 GMT
Illustration by John Gould  |
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Post by Sebbe on May 10, 2014 19:15:58 GMT
Sephanoides fernandensis (P.P. King, 1831) Juan Fernandez Firecrown Includes †leyboldi; see Johow (2007), who concluded that there is no evidence that the species ever occurred on Isla Alejandro Selkirk. www.birdforum.net/showthread.php?t=214600&page=7 |
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Post by Sebbe on Sept 17, 2014 21:55:45 GMT
Sephanoides fernandensis (P.P. King, 1831) Juan Fernandez Firecrown Includes †leyboldi; see Johow (2007), who concluded that there is no evidence that the species ever occurred on Isla Alejandro Selkirk. www.birdforum.net/showthread.php?t=214600&page=7The subspecies is not reckognized in H&M4 nor the HBW Illustrated checklist based on Johow (2007): The Hummingbird of the Masfuera Island: extinct subspecies, never never existed, or mystery bird? Bol. Chileno. 13: 28-41. Full paper in Spanish: aveschile.cl/boletin/PDF/13/28-41-bco13-(2007)-fjohow-piaflor-masafuera.pdfThere seems to be no concrete evidence suggesting the species ever occured on Alejandro Selkirk, based on that it would seem wise to move this thread to formerly reckognized. |
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Post by Melanie on Sept 18, 2014 4:31:16 GMT
From HBW alive (cf also Johow (2007), Hume & Walters (2012))
Position of proposed form †leyboldi is a mystery; originally considered a separate species, supposedly from Alejandro Selkirk I (Juan Fernández Is), but there is no evidence that this species ever occurred on Alejandro Selkirk. Two specimens in Tring and Dublin.
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Post by Sebbe on Sept 18, 2014 16:32:33 GMT
There is some additional information here. Apparently Sephanoides fernandensis leyboldi was described by Gould (1870) based on a few specimens collected by helpers of Leybold. Meaning that Leybold who I assume was the one supplying Gould with the specimens did not collect the specimens himself. The taxonomic differentiation is also marginal, and the type material is lost. The last supposed record from Alejandro Selkirk was made by the botanist Skottsberg in 1908, visits by zoologists in 1917 failed to find it even though they did spend several weeks on the island (Lönnberg, 1921). It would also seem that Johow was investigating the past occrence of this species on Alejandro Selkirk already back in 2003. www.uni-muenster.de/imperia/md/content/landschaftsoekologie/mitarbeiter/hahn/hahn_et_al_2006_-_senckenb_biol_-_jf_bird_popul_-_fin_.pdf |
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Post by Sebbe on Sept 18, 2014 16:43:24 GMT
Further information here, it is unclear if Leybold ever visited Alejandro Selkirk himself. Besides the characteristics of female leyboldi falls within the variation of fernandensis, meaning that even if it ever occured on Alejandro Selkirk it is unlikely to have been distinct from birds on Juan Fernández. Also Johow (2003) presens reasonable doubts on the correctness and previous existence of this taxon based on unpublished material from his great-grandfather, who was one of the first natural scientists visiting the archipelago in the late 19th century who had not reported a single specimen during his field work (JOHOW, 1896). www.uni-muenster.de/imperia/md/content/landschaftsoekologie/mitarbeiter/hahn/hahn_et_al_2009_-_vertebrate_zool_59__103-114.pdf |
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Post by Melanie on Sept 18, 2014 17:06:29 GMT
S. f. leyboldi is still listed in the IOC masterlist and I think a SACC proposal to determine the correct status of this taxon is badly needed.
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Post by Melanie on Sept 19, 2014 13:34:07 GMT
Seems that aveschile has removed the download link to the paper. |
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Post by Melanie on Apr 28, 2016 23:28:28 GMT
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s h i t, I have not enough time to look on such sites. And theese poor animals die out to fast !!! 
