Phenological sensitivity of Bromus tectorum genotypes depends on current and source environments

作者：Megan L. Vahsen, Toby M. Maxwell, Dana M. Blumenthal, Diana Gamba, Matthew J. Germino, Mevin B. Hooten, Jesse R. Lasky, Elizabeth A. Leger, Nikki Pirtel, Lauren M. Porensky, Seth Romero, Justin J. Van Ee, Stella M. Copeland, David J. Ensing, Peter B. Adler · 发表于：Ecology · 年份：2025 · DOI：10.1002/ecy.70025 · 被引用次数：5 · 研究领域：Rangeland and Wildlife Management、Ecology and Vegetation Dynamics Studies、Species Distribution and Climate Change

Abstract Plants respond to their environment with both short‐term, within‐generation trait plasticity, and long‐term, between‐generation evolutionary changes. However, the relative magnitude of plant responses to short‐ and long‐term changes in the environment remains poorly understood. Shifts in phenological traits can serve as harbingers for responses to environmental change, and both a plant's current and source (i.e., genotype origin) environment can affect plant phenology via plasticity and local adaptation, respectively. To assess the role of current and source environments in explaining variation in flowering phenology of Bromus tectorum , an invasive annual grass, we conducted a replicated common garden experiment using 92 genotypes collected across western North America. Replicates of each genotype were planted in two densities (low = 100 seeds/1 m 2 , high = 100 seeds/0.04 m 2 ) under two different temperature treatments (low = white gravel; high = black gravel; 2.1°C average difference) in a factorial design, replicated across four common garden locations in Idaho and Wyoming, USA. We tested for the effect of current environment (i.e., density treatment, temperature treatment, and common garden location), source environment (i.e., genotype source climate), and their interaction on each plant's flowering phenology. Flowering timing was strongly influenced by a plant's current environment, with plants that experienced warmer current climates and higher densities flow...