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The Peninsular Effect in Iberian Butterflies (Lepidoptera: Papilionoidea and Hesperioidea)
Jose Martin and Pilar Gurrea
Journal of Biogeography
Vol. 17, No. 1 (Jan., 1990), pp. 85-96
Published by: Wiley
Stable URL: http://www.jstor.org/stable/2845190
Page Count: 12
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A species density analysis of the butterflies and skippers of the Iberian peninsula is presented. Degree meridians of latitude and parallels of longitude were used to partition the Iberian peninsula into eighty-one quadrats, each 1⚬ of latitude by 1⚬ of longitude. A stepwise multiple regression analysis was performed on species densityes with a total of nine physical, geographic and climatic factors for each square. In most taxonomic groups of butterflies, the most important factor determining species density is geography, i.e. latitude, longitude and distance from the Pyrenees. The result is a marked peninsular effect. The second most important factor is topography, in particular altitude; pluviometric irregularity, annual precipitation and soil type rank third. In Iberian butterflies, as in other lepidopterous groups, there is a clear predominance of species of European origin; the number of species of African origin is very small, except in the Anthocharinae.
Journal of Biogeography © 1990 Wiley