Linking species traits and demography to explain complex temperature responses across levels of organization.

Journal Article (Journal Article)

Microbial communities regulate ecosystem responses to climate change. However, predicting these responses is challenging because of complex interactions among processes at multiple levels of organization. Organismal traits that determine individual performance and ecological interactions are essential for scaling up environmental responses from individuals to ecosystems. We combine protist microcosm experiments and mathematical models to show that key traits-cell size, shape, and contents-each explain different aspects of species' demographic responses to changes in temperature. These differences in species' temperature responses have complex cascading effects across levels of organization-causing nonlinear shifts in total community respiration rates across temperatures via coordinated changes in community composition, equilibrium densities, and community-mean species mass in experimental protist communities that tightly match theoretical predictions. Our results suggest that traits explain variation in population growth, and together, these two factors scale up to influence community- and ecosystem-level processes across temperatures. Connecting the multilevel microbial processes that ultimately influence climate in this way will help refine predictions about complex ecosystem-climate feedbacks and the pace of climate change itself.

Full Text

Duke Authors

Cited Authors

  • Wieczynski, DJ; Singla, P; Doan, A; Singleton, A; Han, Z-Y; Votzke, S; Yammine, A; Gibert, JP

Published Date

  • October 2021

Published In

Volume / Issue

  • 118 / 42

Start / End Page

  • e2104863118 -

PubMed ID

  • 34642248

Pubmed Central ID

  • PMC8545467

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.2104863118

Language

  • eng