White Rose University Consortium logo
University of Leeds logo University of Sheffield logo York University logo

Plant functional traits and vegetation strategies

Santini Gonzalez, Bianca Ariana (2015) Plant functional traits and vegetation strategies. PhD thesis, University of Sheffield.

[img] Text (Ph D thesis)
BA Santini Thesis.pdf
Restricted until 2020.

Request a copy

Abstract

In this thesis we tested the predictions from the CSR theory for the community membership. Predictions are that, in the absence of competition, species from all strategies (Competitors, Ruderals and Stress-tolerants) will persist in low-stress habitats, whereas in high-stress habitats, only species with Stress-tolerant traits will survive. CSR recognizes that species evolved similar traits to one universal stress. For this reason, we were interested in testing which strategies will survive in different sources of stress. Our results from field and greenhouse experiments suggest that CSR theory does not predict community membership from the initial stages of a plant life-cycle. Instead, we found that the habitat stress plays a major role in determining the species that are incorporated into a community. In this thesis we also used a trait-based approach to evaluate: 1) the relationship between key traits using annuals species, and 2) the links between genome size and phenotypic variation within species. Firstly, we studied the triangular relationship reported for seed mass and leaf area in woody species. These traits are involved in the plant reproduction strategy and plant water and energy-use. We found a triangular relationship in annuals species, suggesting that is conserved across groups (woody and annuals). We also found that the driver of this relationship is related to soil fertility. Finally, for the relationship between genome size and phenotypic variation within species, we found that larger genome species display higher variation in traits than small genome species. This can be a potential advantage in heterogeneous environments where the amount of phenotypic variation would allow the species to adapt to them.

Item Type: Thesis (PhD)
Keywords: Plant functional traits, CSR theory, leaf area, seed mass, genome size
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Animal and Plant Sciences (Sheffield)
The University of Sheffield > Faculty of Science (Sheffield)
Depositing User: Bianca Ariana Santini Gonzalez
Date Deposited: 22 Jun 2016 10:01
Last Modified: 22 Jun 2016 10:01
URI: http://etheses.whiterose.ac.uk/id/eprint/12119

Please use the 'Request a copy' link(s) above to request this thesis. This will be sent directly to someone who may authorise access.
You can contact us about this thesis. If you need to make a general enquiry, please see the Contact us page.

Actions (repository staff only: login required)