Arid
DOI10.1111/jbi.12711
Correlates of range size variation in the Australian seed-plant flora
Gallagher, Rachael V.
通讯作者Gallagher, Rachael V.
来源期刊JOURNAL OF BIOGEOGRAPHY
ISSN0305-0270
EISSN1365-2699
出版年2016
卷号43期号:7页码:1287-1298
英文摘要

AimTo 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.


LocationAustralia.


MethodsRange sizes were estimated from herbarium records using alpha-hulls for 19,227 species and mapped into a set of 0.5 degrees x0.5 degrees 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).


Results68% of Australian seed-plant species have ranges which cover <1% of the continent. Generally, large ranges are characteristic of graminoids and herbs and are associated with arid and grassland biomes. The smallest ranges were found in Mediterranean ecosystems in the SW corner of the continent, and were typically shrub species. Range size peaked at mid-latitudes and was not consistently smaller at lower latitudes (contrary to Rapoport’s Rule). Increasing aridity, MAT and soil pH were strong predictors of large range size; however, soil depth and P content had little influence in SAR models.


Main conclusionsAridity and temperature are the primary drivers of range size variation in the Australian flora. Trait syndromes which promote colonization and survival in arid and grassland habitats (e.g. C4 photosynthesis, wind pollination) have allowed grasses and herbs to occupy large areas of the continent. Ranges were not smaller, on average, in the tropics due to the concentration of large-ranged species in the widespread arid biome in the centre of the continent.


英文关键词area of occupancy aridification arid zone climate variability climatic gradients extent of occurrence extinction risk grasses null model wind pollination
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000378711400002
WOS关键词QUATERNARY CLIMATE-CHANGE ; EXTINCTION RISK ; EVOLUTION ; CONSERVATION ; VEGETATION ; PHYTOGEOGRAPHY ; DISTRIBUTIONS ; SPECIATION ; DISPERSAL ; INFERENCE
WOS类目Ecology ; Geography, Physical
WOS研究方向Environmental Sciences & Ecology ; Physical Geography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/194262
作者单位Macquarie Univ, Dept Biol Sci, N Ryde, NSW 2109, Australia
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Gallagher, Rachael V.. Correlates of range size variation in the Australian seed-plant flora[J],2016,43(7):1287-1298.
APA Gallagher, Rachael V..(2016).Correlates of range size variation in the Australian seed-plant flora.JOURNAL OF BIOGEOGRAPHY,43(7),1287-1298.
MLA Gallagher, Rachael V.."Correlates of range size variation in the Australian seed-plant flora".JOURNAL OF BIOGEOGRAPHY 43.7(2016):1287-1298.
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