DOI: 10.5061/dryad.bcc2fqzkp
title: Data from: Uncovering the cause of breakup between species' range limits and niche limits under climate warming

description: Aim: Global climate change has been linked to shifts in species'
 geographic and elevational distributions, with taxa varying in
 responsiveness. This variation may be due to a time lag of the response or
 climate alone not being a simple determinant of distribution limits. To
 tease apart the role of climate in distribution, we compared the
 temperature response of predicted occurrence revealed by ecological niche
 modelling (ENM) on historical climate with that of performance in a
 multi-population transplant experiment. Congruence would support that
 climate is a main driver of distribution limits of a species. Location:
 North America. Taxon: Arabidopsis lyrata subsp. lyrata. Methods: Seeds of
 20 populations of North American Arabidopsis lyrata from across the entire
 range were collected, propagated and then sown along a latitudinal
 transect across and beyond the species' range. Lifetime performance
 was related to niche-and range-determining climatic variable revealed by
 ENM. Results: Lifetime performance did not consistently decline towards
 the high-latitude range limit, but it did so towards the low-latitude
 range limit. This decline was slightly weaker for low-latitude
 populations, indicating divergent climate adaptation. The overall
 performance curve on the field-measured minimum temperature in early
 spring was fairly congruent with the curve of ENM-predicted suitability on
 this important niche-determining variable. ENM-based projections revealed
 that the southernmost populations were vulnerable under climate warming.
 Main Conclusions: Results verified that ENM based on species occurrences
 can well-predict plant performance under field conditions. Congruence
 teaches us that with the climate change so far, the species exhibits a
 colonisation deficit in the north. Furthermore, the southernmost
 populations are vulnerable to extinction. A likely outcome is the
 shrinking of the species' range.
description: The <em>Arabidopsis lyrata</em> occurrence data set
 was compiled with data from Lee-Yaw et al. (2018, Ecography, doi:
 10.1111/ecog.02869), the GBIF database with occurrence data entries after
 1960 (GBIF.org, September 14, 2022), and various herbaria collections. The
 thinned data set contains 433 occurrences/entries, each with information
 on: sample identity (point_ID), latitude, longitude, and the source of
 information.
description: # Occurrences of *Arabidopsis lyrata* subsp. *lyrata* - thinned data set
 [https://doi.org/10.5061/dryad.bcc2fqzkp](https://doi.org/10.5061/dryad.bcc2fqzkp) ## Description of the data and file structure The data set (Jbi14796_occurrencesAlyrata_thinned_20251209.txt) contains occurrences of *Arabidopsis lyrata* subsp. *lyrata*, after thinning to the median Euclidean distance among occurrences (i.e., c.a. 10–11 km). Each row refers to one occurrence point (N = 433) and includes information on sample identity (as used by the source, e.g., GBIF), latitude [°N, +] and longitude [°W, -]. Latitude and longitude data from other public repositories can be found there and marked as "disclosed" in this data.