Skip to main content
Dryad

Is a restricted niche the explanation for species vulnerability? Insights from a large field survey of Astragalus tragacantha L. (Fabaceae)

Data files

Sep 09, 2021 version files 392.90 KB

Abstract

In this study, we examine the realized niche of A. tragacantha in Provence. We focus our fieldwork on habitat characteristics, floristic survey and perform an exhaustive demographic census. We base our analyses on total density and densities of different size stages of A. tragacantha. We delineate its realized ecological niche with the Outlying Mean Index (OMI) multivariate method and estimated the effects of environmental gradients on A. tragacantha populations with the Generalized Joint Attribute Modelling method (GJAM). Analyses based on occurrence data did not support the hypothesis that a too narrow niche by itself explains the vulnerability of A. tragacantha. However, niche modelling revealed differences among size stages supporting a restricted regeneration niche and a wider ecological range in the past.

This dataset is accompanying the manuscript published in Flora "Is a restricted niche the explanation for species vulnerability? Insights from a large field survey of Astragalus tragacantha L. (Fabaceae)"