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Post by sebbe67 on May 24, 2006 18:16:49 GMT
This subspecies differs from the subspecies argus by the brighter blue in the male, and a blue flush that extends over most of the wings in the female. This subspecies is now extinct.
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Post by Deleted on May 24, 2006 18:23:36 GMT
Hi !
Where did it live exactly in the UK ? Do You know that ?
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Post by Deleted on May 24, 2006 18:26:25 GMT
I found it, it lived in Northwest England  |
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Post by Melanie on May 24, 2006 19:12:03 GMT
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Post by Deleted on May 24, 2006 19:21:10 GMT
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Post by Bowhead Whale on Jan 26, 2007 19:35:04 GMT
Do we have any idea of the date of the extinction?
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Post by Melanie on Jan 26, 2007 21:01:23 GMT
1942 The Silver-studded Blue occurs across the temperate areas of Europe and Asia to Japan (Higgins & Riley 1970). In continental Europe, it occurs in a wider range of situations than in the British Isles, including alpine grassland, meadows, forest clearings and xerophytic shrubland. It occurs in most parts of Europe except northern Scandinavia (Higgins & Riley 1970). In Britain it was widely distributed at the turn of the century but it has since undergone a substantial decline and has become extinct except in southern and south-western England, and small parts of East Anglia, coastal Wales and the West Midlands (Heath et al. 1984, see Appendix 1). It is now common only in Dorset and Hampshire. The butterfly also occurs on the Scillies and Channel Islands. It used to occur in Scotland around the turn of the century (Heath et al 1984), although there is doubt over some of the records (Thomson 1980) (the only known specimen is from Loch Rannoch in 1936). It was once quite common in Cumbria (subspecies P. argus masseyi) and Lancashire (Birkett 1957) before its extinction in about 1942 (Thomas 1985b). Extinctions elsewhere in northern and central England and Wales occurred largely before 1940 (Thomas 1985b). 44% of pre-1940 10km squares were lost between 1945 and 1970 and 65% up to 1982 (Thomas 1985b, Warren et al. in prep). www.butterfly-conservation.org/species/action_plans/silver-studded_blue/ssb_action_plan.pdf |
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Post by Bowhead Whale on Jan 27, 2007 19:53:04 GMT
So, its extinction went slowly and gradually, from before the 1940's to the late 1980's, if I understand well.
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Post by Deleted on Apr 6, 2010 17:20:55 GMT
Population differentiation and conservation of endemic races: the butterfly, Plebejus argus -------------------------------------------------------------------------------- C. D. Thomas a1 c1 , S. W. T. Glen a2 p1 , O. T. Lewis a1 p2 , J. K. Hill a1 p3 and D. S. Blakeley a1 a1 Centre for Biodiversity and Conservation, School of Biology, University of Leeds, Leeds, LS2 9JT, UK a2 School of Biological Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK Abstract Five races of the Eurasian silver-studded blue butterfly, Plebejus argus, are restricted to different habitats in north Wales and north-west England. One of these races is extinct, and others are threatened. The four extant forms differ in morphology, habitat, host plant choice, performance on different host plant species and species of associated ant. Some of these differences are maintained in captivity, suggesting evolutionary divergence. Different races with different habitat requirements require different practical conservation management to maintain existing populations and metapopulations. Between-population, or racial, variation is an important consideration in the development of conservation programmes for this and other threatened species. Racial differentiation in P. argus suggests relatively long periods of isolation in particular habitats; the same areas contain other rare species and races. Many countries support the principle of conserving genetic variation within species, but practical methods do not exist for recognizing key areas to prioritize. We suggest that the existence of local races of well-known taxa may be used to indicate biodiversity hotspots, at a taxonomic level below that of full species. These may represent key locations for the conservation of genetic bio-diversity. journals.cambridge.org/action/displayAbstract;jsessionid=9C2060D0B08D49CF975CC53E5ED75B93.tomcat1?fromPage=online&aid=52179 |
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Post by Deleted on Apr 6, 2010 17:21:10 GMT
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Post by Deleted on Apr 6, 2010 17:21:34 GMT
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Post by Deleted on Apr 6, 2010 17:22:01 GMT
Massey's Silver-studded Blue( Plebejus argus masseyi) the four butterflies above as well as the larva and pupa on the right stem:  source: 'British butterflies and their transformations: arranged and illustrated in a series of plates by H.N. Humphreys; with characters and descriptions by J.O. Westwood. London: William Smith, 1841.' www.biodiversitylibrary.org
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Post by surroundx on May 11, 2014 4:59:57 GMT
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Post by Melanie on May 11, 2014 10:38:47 GMT
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Post by Sebbe on Oct 7, 2024 9:01:42 GMT
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