Germination behaviour of annual plants under changing climatic conditions: separating local and regional environmental effects.

Oecologia
Martina Petrů, Katja Tielbörger

Abstract

The role of local adaptation and factors other than climate in determining extinction probabilities of species under climate change has not been yet explicitly studied. Here we performed a field experiment with annual plants growing along a steep climatic gradient in Israel to isolate climatic effects for local trait expression. The focus trait was seed dormancy, for which many theoretical predictions exist regarding climate-driven optimal germination behaviour. We evaluated how germination is consistent with theory, indicating local adaptation to current and changing climatic conditions, and how it varies among species and between natural and standardised soil conditions. We reciprocally sowed seeds from three or four origins for each of three annual species, Biscutella didyma, Bromus fasciculatus and Hymenocarpos circinnatus, in their home and neighbouring sowing locations along an aridity gradient. Our predictions were: lower germination fraction for seeds from more arid origins, and higher germination at wetter sowing locations for all seed origins. By sowing seeds in both local and standard soil, we separated climatic effects from local conditions. At the arid sowing location, two species supported the prediction of low ge...Continue Reading

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Citations

Mar 12, 2013·Oecologia·Holly R PrendevilleLaura F Galloway
Oct 20, 2010·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Katja TielbörgerMarcelo Sternberg
Jul 5, 2012·Evolution; International Journal of Organic Evolution·Ilkka KronholmJuliette de Meaux
Feb 6, 2017·The New Phytologist·Christian LampeiKatja Tielbörger

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