Abstract Detail



Physiology & Ecophysiology

Nielsen, Reina  [1], Drenovsky, Rebecca [2].

Trade-off and plasticity response of low nutrient, low rainfall adapted species to increased water and nutrients.

Traits that increase mean nutrient retention times are essential to plant survival and performance in low resource environments, where multiple stressors (low water and nutrients) are present. Although physiological responses to either water or nutrient stress are well understood, fewer studies have comprehensively investigated the interaction of these stressors from a phylogenetically controlled, whole-plant perspective. This research focused on a suite of related, shrubby species from the California chaparral that either grow on or off serpentine soils, which differ in nutrient availability, using both greenhouse and field studies and evaluated their responses to altered water and nutrient availability. The greenhouse study addressed trade-offs among nutrient conservation traits, trait plasticity in response to resource availability, and instantaneous measures of plant stress of three, phylogenetically controlled pairs of high and low nutrient adapted plant species to increased water and nutrients. The responses of the greenhouse grown juvenile plants were then compared to juvenile plants growing in the field. We hypothesized that 1) all species will positively respond to increased water and nutrients by increasing biomass production and having higher rates of gas exchange and nutrient use, 2) faster growing species will exhibit a larger degree of plasticity, and 3) there will be an effect of phylogeny among among congeners pairs. Preliminary results suggest that growth responses to water availability was dependent on nutrient availability. Knowing how low nutrient adapted species, such as those in the California chaparral, respond at a whole plant level to anthropogenic environmental change can help us better understand individual level plant responses and, ultimately, the future of plant communities in biodiversity hotspots, common in low nutrient environments.


1 - 235 South Knowlton Street, Kellogg, MN, 55945, United States
2 - Biology Department, 1 John Carroll Blvd, University Heights, OH, 44118, United States

Keywords:
Nutrient uptake
Climate change
Nitrogen deposition
Resorption.

Presentation Type: Poster
Number: PPE005
Abstract ID:501
Candidate for Awards:None


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