Accelerated phenology fails to buffer fitness loss from delayed rain onset in a clade of wildflowers

Author:

Worthy Samantha J.ORCID,Ashlock Sarah R.,Miller Arquel,Maloof Julin N.,Strauss Sharon Y.,Gremer Jennifer R.,Schmitt Johanna

Abstract

AbstractThe timing of early life cycle events has cascading effects on phenology and fitness. These effects may be critical for climate resilience of plant populations, especially in Mediterranean environments, where delayed rainfall onset causes delayed germination. To examine impacts of germination timing on ten species of theStreptanthus/Caulanthusclade, we induced germination across a range of dates in ambient seasonal conditions and recorded phenological and fitness traits. Later germination cohorts accelerated flowering, partially stabilizing flowering date, but the degree of this compensatory plasticity differed across species. Fitness declined with later germination; the magnitude of this decline depended on the balance between direct negative effects of later germination and compensatory positive effects of accelerated flowering. The resulting species’ differences in fitness responses suggest differential vulnerability to climate change. Species from wetter, cooler, less variable habitats accelerated flowering more and declined less in seed set with later germination, suggesting climate adaptation. However, other fitness responses to germination timing, like first year fitness, were evolutionarily labile across the clade and unrelated to climate. Although compensatory phenological plasticity may buffer the impacts of delayed germination, it cannot prevent long term declines in population fitness as fall rains come later with climate change.

Publisher

Cold Spring Harbor Laboratory

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3