干旱区生态环境知识资源中心(Arid): Vegetation change along a Mediterranean to arid zone bioclimatic gradient reveals scale-dependent ecotone patterning

Arid

DOI	10.1071/BT20036
	Vegetation change along a Mediterranean to arid zone bioclimatic gradient reveals scale-dependent ecotone patterning
	Caddy-Retalic, S.; Wardle, G. M.; Leitch, E. J.; McInerney, F. A.; Lowe, A. J.
通讯作者	Caddy-Retalic, S
来源期刊	AUSTRALIAN JOURNAL OF BOTANY
ISSN	0067-1924
EISSN	1444-9862
出版年	2020
卷号	68 期号:8 页码:574-586
英文摘要	The drivers and rate of vegetation change across spatial gradients can give critical insights into the compositional and structural change we can expect under climate change. Spatial ecotones are of particular interest as they represent heterogeneity in the patterning of vegetation that may reflect how temporal environmental change will manifest in more abrupt step changes in plant composition and/or structure. Another dimension of interest is the degree to which survey methodology impacts the detectability of thresholds in vegetation. We surveyed a Mediterranean to arid zone gradient in South Australia with nested and non-nested transect designs and related the observed vegetation change to soil, landscape and climate to determine the strongest environmental associations. Ordination, principal components analysis (PCA) and threshold indicator taxa analysis (TITAN) were used to detect potential ecotones associated with environmental thresholds. Results from the two transects were compared with test the effects of survey method and spatial sampling on pattern detection. Ordinations and regressions for both transects indicated vegetation changed linearly along the environmental gradient. Species richness and total cover increased with rainfall. Species turnover was very high, with low nestedness, indicating high susceptibility to environmental change. Climate is the major driver of broad-scale vegetation change on our gradient and at this scale vegetation trends are detectable with a range of survey methodologies. TITAN identification of a threshold within the shorter, nested transect (but not the longer transect which extended into the arid zone) indicated that survey methodology influences ecotone detectability, and that although smaller-scale vegetation disjunctions may be present, change spanning the entire mesic to arid zone is largely monotonic.
英文关键词	climate change impacts complex gradients ecotone heterogeneity Mediterranean biome nestedness ordination PCA plant composition survey methodology TITAN transects vegetation gradients
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000595453200001
WOS关键词	PLANT-SPECIES RICHNESS ; CLIMATE-CHANGE ; BIODIVERSITY ; DIVERSITY ; FACILITATION ; COMPETITION ; RESPONSES ; TURNOVER ; RAINFALL ; COVER
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327831
作者单位	[Caddy-Retalic, S.; Leitch, E. J.; Lowe, A. J.] Univ Adelaide, Sch Biol Sci, North Terrace, Adelaide, SA 5005, Australia; [Caddy-Retalic, S.; Leitch, E. J.; Lowe, A. J.] Univ Adelaide, Environm Inst, North Terrace, Adelaide, SA 5005, Australia; [Caddy-Retalic, S.; Wardle, G. M.] Univ Sydney, Sch Life & Environm Sci, Sydney, NSW 2006, Australia; [McInerney, F. A.] Univ Adelaide, Sch Phys Sci, North Terrace, Adelaide, SA 5005, Australia; [McInerney, F. A.] Univ Adelaide, Sprigg Geobiol Ctr, North Terrace, Adelaide, SA 5005, Australia
推荐引用方式 GB/T 7714	Caddy-Retalic, S.,Wardle, G. M.,Leitch, E. J.,et al. Vegetation change along a Mediterranean to arid zone bioclimatic gradient reveals scale-dependent ecotone patterning[J],2020,68(8):574-586.
APA	Caddy-Retalic, S.,Wardle, G. M.,Leitch, E. J.,McInerney, F. A.,&Lowe, A. J..(2020).Vegetation change along a Mediterranean to arid zone bioclimatic gradient reveals scale-dependent ecotone patterning.AUSTRALIAN JOURNAL OF BOTANY,68(8),574-586.
MLA	Caddy-Retalic, S.,et al."Vegetation change along a Mediterranean to arid zone bioclimatic gradient reveals scale-dependent ecotone patterning".AUSTRALIAN JOURNAL OF BOTANY 68.8(2020):574-586.