Marginality indices for biodiversity conservation in forest trees

Picard, Nicolas; Marchi, Maurizio; Serra-Varela, Maria Jesus; Westergren, Marjana; Cavers, Stephen ORCID:; Notivol, Eduardo; Piotti, Andrea; Alizoti, Paraskevi; Bozzano, Michele; González-Martínez, Santiago C.; Grivet, Delphine; Aravanopoulos, Filippos A.; Vendramin, Giovanni Giuseppe; Ducci, Fulvio; Fady, Bruno; Alía, Ricardo. 2022 Marginality indices for biodiversity conservation in forest trees. Ecological Indicators, 143, 109367. 11, pp.

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Marginal and peripheral populations are important for biodiversity conservation. Their original situation in a species’ geographic and ecological space often confers them genetic diversity and traits of high adaptive value. Yet theoretical hypotheses related to marginality are difficult to test because of confounding factors that influence marginality, namely environment, geography, and history. There is an urgent need to develop metrics to disentangle these confounding factors. We designed nine quantitative indices of marginality and peripherality that define where margins lie within species distributions, from a geographical, an environmental and a historical perspective. Using the distribution maps of eight European forest tree species, we assessed whether these indices were idiosyncratic or whether they conveyed redundant information. Using a database on marginal and peripheral populations based on expert knowledge, we assessed the capacity of the indices to predict the marginality status of a population. There was no consistent pattern of correlation between indices across species, confirming that the indices conveyed different information related to the specific geometry of the species distributions. Contrasting with this heterogeneity of correlation patterns across species, the relative importance of the indices to predict the marginality status of populations was consistent across species. However, there was still a significant country effect in the marginality status, showing a variation in expert opinion of marginality vis-á-vis the species distribution. The marginality indices that we developed are entirely based on distribution maps and can be used for any species. They pave the way for testing hypotheses related to marginality and peripherality, with important implications in quantitative ecology, genetics, and biodiversity conservation.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Biodiversity (Science Area 2017-)
ISSN: 1470-160X
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: centre-periphery hypothesis, environmental indices, geographical indices, migration indices, in situ genetic conservation, marginal populations, peripheral populations
NORA Subject Terms: Ecology and Environment
Date made live: 30 Dec 2022 12:20 +0 (UTC)

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