Functional traits allow ecologists to develop mechanistic models that predict how ecological communities will respond to perturbations and how species will affect community and ecosystem processes in a rapidly changing world. Our research explores how plant biochemical and physiological traits drive ecological processes such as invasion, community assembly, and nutrient cycling. Click on 'Research’ to read more about specific projects.

Read about our current NSF-funded climate-change project here, or watch this video.

Research

How do plants respond to reduced water availability?

Measuring mid-day water potential in the field

Precipitation in arid and semi-arid environments can vary strongly within and across years and plant fitness can depend on rapid or efficient utilization of water during these events. Plant species adapted to arid systems possess numerous leaf, stem and root traits that serve to minimize water stress, but it remains unclear whether these water conservation traits limit a plant’s ability to rapidly respond to precipitation events. Our research addresses how traits pertaining to water acquisition and conservation correlate with plant fitness in plant species from a southern California coastal sage scrub community.

What factors contribute to plant invasiveness?

Swordfern invading Hawaiian forest after fire

Invasive species have a significant influence on human health, economics, biodiversity, and ecosystem function in many areas of the world. There has been a great deal of interest in identifying characteristics that promote plant invasiveness as this may facilitate prediction of future invasions, determine the best ways to control invasive species, and help understand the impact of invasive species on native systems. Our current work on invasiveness examines patterns of resource use efficiency and phenotypic plasticity for functional traits related to resource acquisition. Click here for a Nature podcast highlighting some of this research.

Using functional traits to restore invaded ecosystems

Wili wili, a tree native to Hawaii, is surrounded by a sea of invasive fountain grass

Comparing the functional traits of invasive and native species may identify ways to promote the growth of native species and/or curtail the growth of invasive species. This information can be used by resource managers to prioritize areas for invasive species control and to evaluate the potential for resource manipulation (light, nutrient, water availability) as a restoration strategy. Our current work in Hawaii and Mediterranean-climate ecosystems (including California, Australia, South Africa and Spain) focuses on comparing plant functional traits between invasive and native species to identify which native species can outperform invasive species and what environmental conditions are required to favor the growth of natives over invasives during restoration.

Publications

For reprints, click on a title or send an email if your institution does not have journal access. For a complete list of publications, check out my google scholar page.

Kimball S, Funk JL, Spasojevic MJ, Suding KN, Parker S, Goulden ML (in press) Can functional traits predict plant community response to global change? Ecosphere

Funk JL, Nguyen M, Standish RJ, Stock WD, Valladares F (2016) Global resource acquisition patterns of invasive and native plant species do not hold at the regional scale in Mediterranean type ecosystems Biological Invasions doi:10.1007/s10530-016-1297-9

Larson JE, Funk JL (2016) Regeneration: An overlooked aspect of trait-based plant community assembly models Journal of Ecology 104:1284–1298

Funk JL, Larson JE, Ames G, Butterfield B, Cavender-Bares J, Firn J, Laughlin DC, Sutton-Grier A, Williams L, Wright J (2016) Revisiting the Holy Grail: Using plant functional traits to understand ecological processes Biological Reviews

Nguyen M, Ortega AE, Nguyen Q, Kimball S, Goulden M, Funk JL (2016) Evolutionary responses of grassland species to variation in precipitation and soil nitrogen Journal of Ecology 104:979-986

Funk JL, Standish RJ, Stock WD, Valladares F (2016) Plant functional traits of dominant native and invasive species in Mediterranean-climate ecosystems Ecology 97:75-83

Madliger CL, Cooke SJ, Crespi EJ, Funk JL, Hultine KR, Hunt KE, Rohr JR, Sinclair BJ, Suski CD, Willis CKR, Love OP (2016) Success stories and emerging themes in conservation physiology Conservation Physiology 4: doi: 10.1093/conphys/cov057

Menge DNL, Wolf AA, Funk JL (2015) Diversity of nitrogen fixation strategies in Mediterranean legumes Nature Plants doi:10.1038/nplants.2015.64

Funk JL, Rakovski CS, Macpherson JM (2015) On the analysis of phylogenetically paired designs Ecology and Evolution 5:940–947

Standish RJ, Hobbs RJ, Mayfield MM, Bestelmeyer BT, Suding KN, Battaglia LL, Eviner V, Hawkes CV, Temperton VM, Cramer VA, Harris JA, Funk JL, Thomas PA (2014) Resilience in ecology: Abstraction, distraction, or where the action is? Biological Conservation 177:43–51

Funk JL, Matzek V, Bernhardt M, Johnson D (2014) Broadening the case for invasive species management to include impacts on ecosystem services BioScience 64:58-63

Funk JL (2013) The physiology of invasive plants in low-resource environments Conservation Physiology 1: doi:10.1093/conphys/cot026

Matzek V, Covino J, Funk JL, Saunders M (2013) Closing the knowing–doing gap in invasive plant management: accessibility and interdisciplinarity of scientific research Conservation Letters doi: 10.1111/conl.12042

Funk JL, Glenwinkel LA, Sack L (2013) Differential allocation to photosynthetic and non-photosynthetic nitrogen fractions among native and invasive species PLoS ONE 8(5):e64502. doi:10.1371/journal.pone.0064502

Drenovsky RE, Grewell BJ, D’Antonio CM, Funk JL, James JJ, Molinari N, Parker IM, Richards CM (2012) A functional trait perspective on plant invasion Annals of Botany 110: 141–153

Steers RJ, Funk JL, Allen EB (2011) Can resource-use traits predict native vs. exotic plant success in carbon amended soils? Ecological Applications 21:1211-1224

Funk JL, McDaniel S (2009) Altering light availability to restore invaded forest: the predictive role of plant traits Restoration Ecology 18:865-872

Funk JL, Cleland EE, Suding KN, Zavaleta ES (2008) Restoration through re-assembly: plant traits and invasion resistance Trends in Ecology and Evolution 23:695-703

Funk JL, Vitousek PM (2007) Resource use efficiency and plant invasion in low-resource systems Nature 446:1079-1081

Funk JL, Jones CG, Lerdau MT (2007) Leaf- and shoot-level plasticity in response to varying nutrient and water availability Tree Physiology 27:1731-1739

People

  • Jennifer Funk

    Principal Investigator
  • Monica Nguyen

    Research Assistant
  • Megan Blair

    Undergraduate Researcher
  • Nilsha Khurana

    Undergraduate Researcher
  • Sara Wanous

    Undergraduate Researcher

Previous Lab Members

  • Julie Larson was a research associate in the lab from 2013-2016. She contributed to a number of projects that focused on how plants respond to changes in water availability. She is currently pursuing a PhD in Ecology at University of Colorado. She is a rock star and we miss her terribly.
  • Joanne Kim was an undergraduate researcher from 2014-2016. With help from Nilsha Khurana and Megan Blair, she spearheaded a project focusing on how roots of several coastal sage scrub species respond to precipitation pulses.
  • Kurt Nguyen was an undergraduate researcher from 2014-2016. With Monica Nguyen and Amy Ortega, he studied how two invasive grass species responded evolutionarily to altered precipitation and soil nitrogen availability (Nguyen et al. 2016). He is currently pursuing a PhD in Entomology at Texas A&M.
  • Amy Ortega was an undergraduate researcher from 2012-2015. With Monica Nguyen and Kurt Nguyen, Amy studied how two invasive grass species responded evolutionarily to altered precipitation and soil nitrogen availability (Nguyen et al. 2016).
  • Luke Sanborn was an undergraduate researcher from 2013-2015. Luke examined how glutamine synthetase activity regulates nitrogen resorption from senescing leaves.
  • Hannah Inman was an undergraduate researcher from 2012-2014. With Kim Cyphers, she studied how leaf and soil traits influence litter decomposition.
  • Madison Hoffacker was an undergraduate researcher from 2010-2013. She studied the effectiveness of summer irrigation as a restoration tool in invaded serpentine grassland. Her results were published in Restoration Ecology (Funk et al. 2015).
  • Matt Bernhardt was an undergraduate researcher from 2011-2012. He conducted a survey of Weed Management Area chairs in California to determine the impact of state budget cuts on weed management. His results are published in Bioscience (Funk et al. 2013).
  • Kim Cyphers was an undergraduate researcher from 2008-2010. She studied how leaf and soil traits influence litter decomposition.
  • Lori Glenwinkel was a research technician in the lab from 2008-2010. She is currently pursuing her PhD in Molecular and Cell Biology at Columbia University.
  • Ginny Zachary was a research technician in the lab from 2007-2008. She is currently pursuing a degree in nursing at CSU Los Angeles.

COHERE: Chapman-Orange High Ecological Research Experience

Training tomorrow's scientists

Chapman University has partnered with Orange High School to create an innovative research program to engage students who are under-represented in the sciences. Every semester, 10 students from Orange High School conduct hands-on research at Chapman University, including data collection, sample processing, and data analysis. Students conduct research with Dr. Jennifer Funk and Dr. Jason Keller, Associate Professors in the Schmid College of Science and Technology. Students are selected and mentored by Ms. Amelia Strickland, science teacher at Orange High School.

In previous years, students have participated in two research projects. With Dr. Funk, students analyzed leaf nitrogen content to determine how water availability affects leaf traits. With Dr. Keller, students analyzed soil carbon to determine how climate change alters soil carbon cycling. We are excited to see this program grow!