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Abstract Detail


Oberprieler, Christoph [1], Konowalik, Kamil [2], Altpeter, Sabrina [2], Siegert, Elisabeth [2], Lo Presti, Rosa Maria [2], Vogt, Robert [3].

Is time influencing the filling of ecological niches after the emerging of polyploid species? A case study in the genus Leucanthemum Mill. (Compositae, Anthemideae) from the Iberian Peninsula.

Based on the assumption that polyploid species are derived from diploid progenitors we tested the hypothesis that diploid (older) species fill their eco-climatologically potential areal more effectively than polyploid (younger) species. To test this hypothesis, we compared potential and actual distribution ranges of 20 species from the polyploid complex of the genus Leucanthemum Mill. (Compositae, Anthemideae) which occurs on the Iberian Peninsula with 20 taxa spanning ploidy levels between 2n = 2x = 18 and 2n = 22x = 198. While the modelling of the potential areal was based on the maximum entropy method (Maxent), actual distribution ranges were derived from geo-referenced herbarium specimens by defining buffer circles around the collection localities to account for geographical uncertainties and haphazardness of specimen collecting. Buffer circle calculation was based on pair-wise distances among collection sites and was adjusted to the median values of all nearest-neighbour distances found in a species. As a consequence, buffer circles became specific for each species and resulted in realistic species-specific estimates of area sizes occupied by each species. By comparison of sizes of actual and eco-climatologically potential areas for each species (overlap indices), we observe that diploid taxa are filling their eco-climatological niches more exhaustively than polyploid taxa. We interpret this finding to be due to the lack of time to fill the potential distribution available for younger polyploids as compared to their diploid (older) progenitors. This general trend is significant even despite some variation of overlap indices on the diploid level and unexpectedly high overlap index values in the widespread hexaploid L. pallens and the dodecaploid L. maximum.

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1 - Institute Of Botany, University Of Regensburg, Universitätsstr. 31, Regensburg, N/A, D-93040, Germany
2 - University of Regensburg, Institute of Botany, Universitätsstr. 31, Regensburg, D-93040, Germany
3 - Freie Universität Berlin, Botanc Garden & Botanical Museum Berlin-Dahlem, Königin-Luise-Str. 6-8, Berlin, D-14191, Germany

niche modeling
climatic niche.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PBG001
Abstract ID:371
Candidate for Awards:None

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