BIO220H1 Study Guide - Final Guide: Photoperiodism, Natural Selection, Vernalization
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BIO220H1 Full Course Notes
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Lab 1: phenotypic plasticity and adaptive evolution contribute to advancing flowering phenology in response to climate change. Combine continuous 38 yr field survey w/ quantitative genetic field experiments: assess adaptation in context of climate change. Focused on mustard native of us rocky mountains. Look at flowering phenology: earlier flowering b/c climate change. In seasonal environment, plants reproduce in narrow timeframe: can"t emerge too early fitness b/c frost damage to developing floral tissues, no pollinators, intense herbivory, not enough resources to make reproductive organs, can"t flower too late. Won"t be able to complete reproductive cycles before winter/drought conditions. = stabilizing selection favours evolution of intermediate flowering time. But recent analyses find directional selection for earlier flowering in flower spp. Plants flowering earlier now: rising temperatures, altered precipitation regimes, elevated atm co2 concentrations. Earlier flowering time = symptom of rapidly changing climatic conditions o extinction risk if rate of climate change > rate of adaptive phenotypic change.
