caa a22 4500 467889716 CHVBK 20180406152745.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s00049-006-0359-3 doi (NATIONALLICENCE)springer-10.1007/s00049-006-0359-3 Reproductive isolation between populations from Northern and Central Europe of the leaf beetle Chrysomela lapponica L [Elektronische Daten] [Nina Fatouros, Monika Hilker, Jürgen Gross] Summary.: Allopatric populations of the leaf beetle Chrysomela lapponica are known to feed upon either willow (Salicaceae) or birch (Betulaceae). This study aimed to elucidate the differentiation process of these allopatric populations. We investigated whether these allopatric populations specialized on different host plants are still able to produce fertile offspring when interbreeding. Individuals from a population in Finland (willow specialists) and one in the Czech Republic (birch specialists) were crossed in laboratory. Hybrid formation succeeded only between females from the Czech, birch specialized population and males from the Finnish, willow specialized population, while no eggs were produced by females of the willow specialists having mated males of the birch specialists. Behavioral, morphological, physiological, and chemical features of the F1 hybrids were studied. The chemical composition of larval defensive secretion and feeding preferences of the resulting F1 hybrids mainly showed similarities with the paternal phenotype, while the area of black coloring on the offspring's elytra was intermediate between those of the parental elytra. F1 hybrids did not accept the host plant (birch) of their mothers for feeding and only survived on willow. Thus, since mothers only lay eggs on birch, we found evidence for a postzygotic isolation mechanism between the individuals of the two investigated populations: when having been mated with willow specialized Finnish males, the birch specialized Czech mothers place the hybrid eggs on a plant species (birch), on which the hatching larvae cannot survive. Birkhäuser Verlag, Basel, 2006 Chrysomela lapponica nationallicence speciation nationallicence hybridization nationallicence Salicaceae nationallicence Betulaceae nationallicence host plant specialization nationallicence host plant shift nationallicence post zygotic isolation mechanism nationallicence heterosis nationallicence Fatouros Nina Institute of Biology, Free University Berlin, Haderslebener Str. 9, D-12163, Berlin, Germany aut Hilker Monika Institute of Biology, Free University Berlin, Haderslebener Str. 9, D-12163, Berlin, Germany aut Gross Jürgen Institute of Biology, Free University Berlin, Haderslebener Str. 9, D-12163, Berlin, Germany aut CHEMOECOLOGY Birkhäuser-Verlag; www.birkhäuser.ch 16/4(2006-12-01), 241-251 0937-7409 16:4<241 2006 16 49 https://doi.org/10.1007/s00049-006-0359-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00049-006-0359-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fatouros Nina Institute of Biology, Free University Berlin, Haderslebener Str. 9, D-12163, Berlin, Germany aut NATIONALLICENCE 700 1- Hilker Monika Institute of Biology, Free University Berlin, Haderslebener Str. 9, D-12163, Berlin, Germany aut NATIONALLICENCE 700 1- Gross Jürgen Institute of Biology, Free University Berlin, Haderslebener Str. 9, D-12163, Berlin, Germany aut NATIONALLICENCE 773 0- CHEMOECOLOGY Birkhäuser-Verlag; www.birkhäuser.ch 16/4(2006-12-01), 241-251 0937-7409 16:4<241 2006 16 49 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer