caa a22 4500 606193170 CHVBK 20210128100908.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10682-014-9741-8 doi (NATIONALLICENCE)springer-10.1007/s10682-014-9741-8 Early shoot growth termination in Betula pendula is associated with the number of overwintering aphid eggs on boreal birches [Elektronische Daten] [Tarja Silfver, Aki Sinkkonen, Elina Oksanen, Matti Rousi] Many autumn migrating and phloem-feeding insects, like aphids, use leaf reflectance to distinguish senescing foliage. They consume resources in autumn and lay eggs that hatch in spring when trees need phloem nutrients for developing leaves. The herbivores may thus drive the evolution of tree senescence and autumn leaf colours. In accordance with this, the yellowing birch leaves attract aphids (Euceraphis betulae) and the genotypic variation in the timing of autumn leaf colouration is associated with the abundance of oviparous wingless female aphids in a natural Betula pendula population. Currently, however, there are no published studies investigating the potential association of autumn senescence and the number of overwintering aphid eggs. We examined a local B. pendula population in 2001 and 2002 for genotypic differences in the timing of shoot growth termination and for the abundance of overwintering birch aphid eggs. There were heritable differences in the timing of shoot growth termination among B. pendula genotypes. The genotypes that terminated shoot growth early had higher aphid egg loads after a short but not after a long autumn. We suggest that this is because the egg laying period was cut off due to a rather sudden and substantial change in the temperature in the shorter autumn. We are the first to find genotypic differences associated with the overwintering offspring of autumn-migrating aphids on a widely distributed temperate broadleaved tree. As shoot growth termination directly precedes leaf senescence, autumn-migrating aphids may have an additional potential to influence indirectly but significantly the onset of autumn leaf senescence at an evolutionary scale. Springer International Publishing Switzerland, 2014 Growth termination nationallicence Senescence nationallicence Aphid eggs nationallicence Genetic variation nationallicence Heritability nationallicence Genetic correlation nationallicence Deciduous tree nationallicence Silfver Tarja Department of Biology, University of Eastern Finland, PL 111, 80101, Joensuu, Finland aut Sinkkonen Aki Section of Environmental Ecology, Department of Environmental Sciences, University of Helsinki, Niemenkatu 73, 15140, Lahti, Finland aut Oksanen Elina Department of Biology, University of Eastern Finland, PL 111, 80101, Joensuu, Finland aut Rousi Matti Vantaa Research Unit, The Finnish Forest Research Institute, 01301, Vantaa, Finland aut Evolutionary Ecology Springer International Publishing 29/1(2015-01-01), 157-167 0269-7653 29:1<157 2015 29 10682 https://doi.org/10.1007/s10682-014-9741-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10682-014-9741-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Silfver Tarja Department of Biology, University of Eastern Finland, PL 111, 80101, Joensuu, Finland aut NATIONALLICENCE 700 1- Sinkkonen Aki Section of Environmental Ecology, Department of Environmental Sciences, University of Helsinki, Niemenkatu 73, 15140, Lahti, Finland aut NATIONALLICENCE 700 1- Oksanen Elina Department of Biology, University of Eastern Finland, PL 111, 80101, Joensuu, Finland aut NATIONALLICENCE 700 1- Rousi Matti Vantaa Research Unit, The Finnish Forest Research Institute, 01301, Vantaa, Finland aut NATIONALLICENCE 773 0- Evolutionary Ecology Springer International Publishing 29/1(2015-01-01), 157-167 0269-7653 29:1<157 2015 29 10682