Local temporal trajectories explain population-level responses to climate change in saguaro (Carnegiea gigantea)

Susana Rodríguez-Buriticá, Daniel E. Winkler, Robert H. Webb, David L Venable

Research output: Contribution to journalArticle

Abstract

Population demography is typically assumed to be strongly influenced by climatic factors, particularly with succulent plants and cacti. The saguaro cactus (Carnegiea gigantea) is a long-lived columnar cactus of the Sonoran Desert that experiences episodic recruitment and mortality. Previous studies have attributed long-term changes in saguaro populations to climatic factors, including increased germination and establishment during wet periods and mortality and reduced establishment during droughts and extreme freezes. We used a 48-yr data set of marked individuals at the Desert Laboratory in Tucson, Arizona, to test the hypothesis that local, temporal population trajectories are mediated by topographic heterogeneity that interacts with fluctuating climatic conditions. We tested the influence of local slope and aspect vs. climatic variability on a population of saguaro using >5800 marked individuals that have been measured since 1964. We examined the relationship between demography and climatic variables (drought, precipitation, and extreme temperatures) and found significant differences in growth and survival among aspects and among census periods. Saguaro population growth was higher during wet and cool periods (e.g., 1964–1970), and changes in age structures suggest that topographic differences interact with climatic fluctuations to produce unexpected demographic patterns including large recruitment events during periods of relatively unfavorable climate conditions. Our results highlight the importance of long-term data to detect demographic responses to climate that could not be predicted from short-term studies of plant physiology and population demography.

Original languageEnglish (US)
Article numbere02844
JournalEcosphere
Volume10
Issue number8
DOIs
StatePublished - Aug 1 2019

Fingerprint

Carnegiea gigantea
cactus
demography
trajectories
trajectory
climate change
desert
drought
mortality
climatic factors
climate conditions
long-term change
age structure
demographic statistics
census
population growth
germination
climate
Sonoran Desert
plant physiology

Keywords

  • Carnegiea gigantea
  • climate change
  • demography
  • desert plants
  • drought
  • extreme temperatures
  • mortality
  • recruitment
  • saguaro
  • Sonoran desert
  • southwest
  • topography

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Local temporal trajectories explain population-level responses to climate change in saguaro (Carnegiea gigantea). / Rodríguez-Buriticá, Susana; Winkler, Daniel E.; Webb, Robert H.; Venable, David L.

In: Ecosphere, Vol. 10, No. 8, e02844, 01.08.2019.

Research output: Contribution to journalArticle

Rodríguez-Buriticá, Susana ; Winkler, Daniel E. ; Webb, Robert H. ; Venable, David L. / Local temporal trajectories explain population-level responses to climate change in saguaro (Carnegiea gigantea). In: Ecosphere. 2019 ; Vol. 10, No. 8.
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