Evolutionary history underlies plant physiological responses to global change since the last glacial maximum

Katie M. Becklin, Juliana S. Medeiros, Kayla R. Sale, Joy K. Ward

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Assessing family- and species-level variation in physiological responses to global change across geologic time is critical for understanding factors that underlie changes in species distributions and community composition. Here, we used stable carbon isotopes, leaf nitrogen content and stomatal measurements to assess changes in leaf-level physiology in a mixed conifer community that underwent significant changes in composition since the last glacial maximum (LGM) (21 kyr BP). Our results indicate that most plant taxa decreased stomatal conductance and/or maximum photosynthetic capacity in response to changing conditions since the LGM. However, plant families and species differed in the timing and magnitude of these physiological responses, and responses were more similar within families than within co-occurring species assemblages. This suggests that adaptation at the level of leaf physiology may not be the main determinant of shifts in community composition, and that plant evolutionary history may drive physiological adaptation to global change over recent geologic time.

Original languageEnglish (US)
Pages (from-to)691-699
Number of pages9
JournalEcology Letters
Issue number6
StatePublished - Jun 2014
Externally publishedYes


  • Climate change
  • Last glacial maximum
  • Leaf nitrogen content
  • Maximum photosynthetic capacity
  • Packrat middens
  • Stomatal conductance
  • Stomatal index

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics


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