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Another theory is that a major disease, such as plague or smallpox, created a selection pressure on the gene variant which increased its frequency.
But its distribution does not match that of disease outbreaks, either.
Every taxon with an eponymous vernacular or scientific name (whether in current usage or not) is listed, followed by a concise biography of the person concerned.
Its easy to believe that Schlegel named the first mentioned specie (the Myna/Starling 1865/1966) after his then recently gone wife, but he doesnt seem to have been very soft-hearted and hed apparently already "moved on" ... Kuhl's type description was based on "Le Caca Barraband" by Levaillant and his Histoire Naturelle des Perroquets (Volume 2) 1805, where Monsieur Barraband was one (the foremost) of three highly skilled and celebrated illustrators. = today Bearded Helmetcrest Oxypogon guerinii BOISSONNEAU 1840 (as "Ornismia Guerinii") a k a "Guerin's Helmet-Crest Hummingbird O. I cant help getting the sad feeling that it will, if not confuse, just blurr a lot of of facts for years to come (like their preceding Whose bird? If diacritical marks have been mangled in the HBWAlive Key I can only plead guilty, but not to systematic mangling; with nearly 30,000 headers and over half a million words some typos and personal preferences must creep in.
For example, more than 15 per cent of people in some areas of northern Europe carry CCR5-Delta32, compared with fewer than 4 per cent of Greeks (see map).
It is not clear why this is so, since the HIV pandemic - which began in the early 1980s - is too recent to have influenced the distribution of the variant.
Description de l'gypte, ou, Recueil des observations et des recherches qui ont t faites en gypte pendant l'expdition de l'arme franaise.
It appears that the Roman Empire left a legacy that may still affect modern Europe - those living within its conquered lands are more susceptible to HIV.
However, the changing frequency of the variant reflects the changing boundary of the Roman Empire from 500 BC to AD 500, says Eric Faure at the University of Provence in Marseille, France.