Correlates of range size variation in the Australian seed‐plant flora

AIM: To map and analyse range size variation in the terrestrial seed‐plant flora of Australia in relation to latitude, habitat availability, climate and soils, and to compare mean range size between biomes and growth forms. LOCATION: Australia. METHODS: Range sizes were estimated from herbarium reco...

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Bibliographic Details
Published in:Journal of biogeography 2016-07, Vol.43 (7), p.1287-1298
Main Author: Gallagher, Rachael V.
Format: Article
Language:English
Subjects:
area of occupancy
arid zone
aridification
climate variability
climatic gradients
extent of occurrence
extinction risk
grasses
null model
Range size variation
wind pollination
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Summary:AIM: To map and analyse range size variation in the terrestrial seed‐plant flora of Australia in relation to latitude, habitat availability, climate and soils, and to compare mean range size between biomes and growth forms. LOCATION: Australia. METHODS: Range sizes were estimated from herbarium records using alpha‐hulls for 19,227 species and mapped into a set of 0.5° × 0.5° grid cells across Australia. Ordinary‐least squares regressions were used to test for relationships between mean range size, latitude and habitat availability. Simultaneous autoregressive models (SAR) with spatial error terms were used in a multi‐model framework to assess the role of aridity, mean annual temperature (MAT), soil pH, depth and total P concentration in shaping range size variation. Species‐level differences between growth forms (graminoids, herbs, trees, shrubs, climbers) and biomes were assessed using one‐way analysis of variance (ANOVA). RESULTS: 68% of Australian seed‐plant species have ranges which cover
ISSN:0305-0270
1365-2699
DOI:10.1111/jbi.12711