Arid
DOI10.1111/jbi.12599
Savanna ant species richness is maintained along a bioclimatic gradient of increasing latitude and decreasing rainfall in northern Australia
Andersen, Alan N.1; Del Toro, Israel1,2; Parr, Catherine L.1,3,4
通讯作者Andersen, Alan N.
来源期刊JOURNAL OF BIOGEOGRAPHY
ISSN0305-0270
EISSN1365-2699
出版年2015
卷号42期号:12页码:2313-2322
英文摘要

Aim Using a standardized sampling protocol along a 600-km transect in northern Australia, we tested whether ant diversity within a single biome, tropical savanna, decreases with increasing latitude (as a surrogate of temperature) and decreasing rainfall, as is expected for biodiversity in general.


Location Northern Australia.


Methods Ants were sampled using pitfall traps on three occasions at 1-hasand, loam and clay sites at each of five locations along the Northern Australian Tropical Transect (NATT), from 12 degrees 50 ’ S (1400 mm mean annual rainfall) to 17 degrees 21 ’ S (650 mm).


Results We recorded a total of 246 species from 37 genera. Mean observed species richness pooled across sampling periods was similar at sand (85.4) and loam (82.2) sites, but was less than half this at clay sites (40.0). Ant communities were also compositionally distinct on clay soils compared with sands and loams. Individual genera showed variable diversity patterns, ranging from a linear increase to a linear decrease in species richness along the NATT. However, total species richness was relatively uniform along the gradient. Patterns of ant species turnover were consistent with previously recognized biogeographical boundaries, with a primary disjunction between the arid and monsoonal zones in the south, and a secondary disjunction between the semi-arid and mesic zones in the north.


Main conclusions Patterns of ant diversity in Australian savannas do not conform to global patterns of biodiversity declines with increasing latitude and decreasing rainfall. We believe this is due to a lack of significant temperature change across the latitudinal gradient, and, in particular, to the fauna’s evolutionary history in association with aridification, which makes it unusually resilient to increasing aridity. The diversity of other important faunal groups such as termites and lizards is also exceptionally high in arid Australia and is likewise not closely linked to rainfall in Australian savannas. We predict that these taxa are far more sensitive to increasing aridity in savannas elsewhere in the world, and especially in the Neotropics, where savannas have an evolutionary association with humid rain forest rather than desert.


英文关键词ant communities biogeographical boundaries evolutionary history latitudinal diversity gradient monsoonal tropics Northern Australian Tropical Transect species diversity species turnover tropical savanna
类型Article
语种英语
国家Australia ; Denmark ; England ; South Africa
收录类别SCI-E
WOS记录号WOS:000367690000008
WOS关键词HYMENOPTERA-FORMICIDAE ; DIVERSITY PATTERNS ; CLIMATE-CHANGE ; TERRESTRIAL TRANSECTS ; COMMUNITY STRUCTURE ; TROPICAL SAVANNA ; GLOBAL PATTERNS ; TERRITORY ; BIODIVERSITY ; ABUNDANCE
WOS类目Ecology ; Geography, Physical
WOS研究方向Environmental Sciences & Ecology ; Physical Geography
来源机构Commonwealth Scientific and Industrial Research Organisation
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/188445
作者单位1.CSIRO, Land & Water Trop Ecosyst Res Ctr, Winnellie, NT 0822, Australia;
2.Univ Copenhagen, Dept Biol, Ctr Macroecol Evolut & Climate, DK-2100 Copenhagen, Denmark;
3.Univ Liverpool, Sch Environm Sci, Liverpool L69 3GP, Merseyside, England;
4.Univ Witwatersrand, Sch Anim Plant & Environm Sci, ZA-2050 Johannesburg, South Africa
推荐引用方式
GB/T 7714
Andersen, Alan N.,Del Toro, Israel,Parr, Catherine L.. Savanna ant species richness is maintained along a bioclimatic gradient of increasing latitude and decreasing rainfall in northern Australia[J]. Commonwealth Scientific and Industrial Research Organisation,2015,42(12):2313-2322.
APA Andersen, Alan N.,Del Toro, Israel,&Parr, Catherine L..(2015).Savanna ant species richness is maintained along a bioclimatic gradient of increasing latitude and decreasing rainfall in northern Australia.JOURNAL OF BIOGEOGRAPHY,42(12),2313-2322.
MLA Andersen, Alan N.,et al."Savanna ant species richness is maintained along a bioclimatic gradient of increasing latitude and decreasing rainfall in northern Australia".JOURNAL OF BIOGEOGRAPHY 42.12(2015):2313-2322.
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