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1. Pironon, Samuel. An Integrative Assessment Of A Major Biogeographical Paradigm: The "Centre-­Periphery" Hypothesis.

Degree: 2017, Universidad Rey Juan Carlos

The discipline of biogeography has long focused on understanding the patterns and processes associated with geographical variation in species performance. In this context, the centre-¬ periphery hypothesis (CPH) has been proposed as a general framework explaining the distribution of intra-¬specific variation across species geographical ranges. Based on the assumption that species ranges are spatial representations of the distribution of their environmental requirements (i.e. ecological niche), it predicts habitat suitability to decrease gradually from the centre to the periphery of a species range. Subsequently, species performance, measured as different characteristics (e.g. abundance, growth, reproduction, genetic diversity...), is expected to exhibit the same distributional pattern. The low performance in peripheral populations/individuals would ultimately be the main factor setting range margins, and confer them a particular interest for conservation. However, the empirical validity of this major biogeographical paradigm has been highly questioned over the last decades. This PhD dissertation provides an integrative and thorough assessment of the CPH, as well as new perspectives for the study of the distribution of intra-¬specific variation. First, it tackles the very basis of the CPH by investigating the demographic structure of the ecological niches of two herbaceous plant species (Plantago coronopus, Clarkia xantiana xantiana). This study shows that different species vital rates do not exhibit the same distribution pattern across environmental gradients and that environmental suitability may not systematically exhibit a centre-¬ periphery distribution in geographic space. Additionally, it highlights that a compensation process among different vital rates may play an important role in guaranteeing the stability of species geographic ranges. Second, it disentangles the effects of geographical, climatic, and historical centre-¬periphery gradients on the distribution of different components of the performance of three widespread plant species (Plantago coronopus, Polygonum viviparum, Silene acaulis) across their continental ranges. Overall, none of these gradients describe the variation in species demographic performance, whereas P. coronopus genetic diversity follows its post-¬glacial range dynamics (i.e. historical centre-¬ periphery gradient). Third, it analyzes occupancy, local abundance, and ecological patterns of the flora of an important European biogeographical crossroad, the Pyrenees Mountains. By comparing species found at their limit of distribution in this mountain range (peripheral species) to those occurring in more central positions (central species), this study shows that peripheral species exhibit lower abundances at large spatial scale, but not at a local one. It also discusses the particular conservation status of these species occurring at range margins. Finally, although it could not be included in this dissertation because of a previous inclusion in another PhD manuscript (Papuga 2016), we…

Subjects/Keywords: Geografía; 2505.01 Biogeografía

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APA (6th Edition):

Pironon, S. (2017). An Integrative Assessment Of A Major Biogeographical Paradigm: The "Centre-­Periphery" Hypothesis. (Thesis). Universidad Rey Juan Carlos. Retrieved from http://hdl.handle.net/10115/14262

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Pironon, Samuel. “An Integrative Assessment Of A Major Biogeographical Paradigm: The "Centre-­Periphery" Hypothesis.” 2017. Thesis, Universidad Rey Juan Carlos. Accessed November 17, 2017. http://hdl.handle.net/10115/14262.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Pironon, Samuel. “An Integrative Assessment Of A Major Biogeographical Paradigm: The "Centre-­Periphery" Hypothesis.” 2017. Web. 17 Nov 2017.

Vancouver:

Pironon S. An Integrative Assessment Of A Major Biogeographical Paradigm: The "Centre-­Periphery" Hypothesis. [Internet] [Thesis]. Universidad Rey Juan Carlos; 2017. [cited 2017 Nov 17]. Available from: http://hdl.handle.net/10115/14262.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pironon S. An Integrative Assessment Of A Major Biogeographical Paradigm: The "Centre-­Periphery" Hypothesis. [Thesis]. Universidad Rey Juan Carlos; 2017. Available from: http://hdl.handle.net/10115/14262

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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