Journal Title
Title of Journal: Plant Ecol
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Abbravation: Plant Ecology
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Publisher
Springer Netherlands
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Authors: Christine Heimes Niels Agerbirk Helle Sørensen Tamara van Mölken Thure P Hauser
Publish Date: 2016/07/16
Volume: 217, Issue: 9, Pages: 1055-1068
Abstract
Evolution of ecotypic differentiation and maintenance of divergence in sympatry is more likely if populations occupy different habitats Two genetically divergent chemotypes of Barbarea vulgaris Brassicaceae with contrasting insect and disease resistances G and Ptype occupy different geographical ranges in Eurasia but cooccur in Denmark Here they grow mostly in separate populations posing the question why they have not merged In a 2year reciprocal transplant experiment we tested whether the two plant types prefer different habitats and are adapted to these possibly influenced by selection by herbivores Vegetation and soil analyses indicated that the Gtype occurs in slightly drier less productive and more alkaline sites than the Ptype Plants planted at sites of their own chemotype had a higher biomass in the first year than plants of the nonresident chemotype but were more damaged by beetle herbivory This suggests that herbivores have adapted genetically or plastically to the resident chemotype Gplants were less damaged by molluscs than Pplants which may be caused by their content of saponins or glucosinolates Levels of glucosinolates in siliques were higher in Gplants but varied strongly among sites Survival reproduction and biomass in the second year did not differ between plants growing at sites of their own chemotype and plants of the other chemotype Thus the two chemotypes of B vulgaris are adapted to different habitats to some extent which could contribute to maintain their differentiation in sympatry Herbivory by some insects however may counteract thisWe are grateful to L Christoffersen and T R Jørgensen P Buch Jensen E Juhl I/S Hedeland N O Lundstedt Dønnerup Gods and M Bornø Clausen Naturstyrelsen for permission to conduct our experiments on their properties We thank J K Nielsen for help with selection of experimental sites and S Christensen L DebautHenocque and K Rysbjerg Munk for practical work This study was supported by the Danish Agency for Science Technology and Innovation Grant No 274080462 and a PhD stipend to CH from University of Copenhagen
Keywords:
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