干旱区生态环境知识资源中心(Arid): Influence of Late Holocene Climate Change and Human Land Use on Terrestrial and Aquatic Ecosystems in Southwest Madagascar

Arid

DOI	10.3389/fevo.2021.688512
	Influence of Late Holocene Climate Change and Human Land Use on Terrestrial and Aquatic Ecosystems in Southwest Madagascar
	Domic, Alejandra I.; Hixon, Sean W.; Velez, Maria I.; Ivory, Sarah J.; Douglass, Kristina G.; Brenner, Mark; Curtis, Jason H.; Culleton, Brendan J.; Kennett, Douglas J.
通讯作者	Hixon, SW (corresponding author)，Univ Calif Santa Barbara, Dept Anthropol, Santa Barbara, CA 93106 USA.
来源期刊	FRONTIERS IN ECOLOGY AND EVOLUTION
ISSN	2296-701X
出版年	2021
卷号	9
英文摘要	Madagascar's biota underwent substantial change following human colonization of the island in the Late Holocene. The timing of human arrival and its role in the extinction of megafauna have received considerable attention. However, the impacts of human activities on regional ecosystems remain poorly studied. Here, we focus on reconstructing changes in the composition of terrestrial and aquatic ecosystems to evaluate the impact of human land use and climate variability. We conducted a paleoenvironmental study, using a sediment record that spans the last similar to 1,145 years, collected from a lakebed in the Namonte Basin of southwest Madagascar. We examined physical (X-ray fluorescence and stratigraphy) and biotic indicators (pollen, diatoms and micro- and macro-charcoal particles) to infer terrestrial and aquatic ecosystem change. The fossil pollen data indicate that composition of grasslands and dry deciduous forest in the region remained relatively stable during an arid event associated with northward displacement of the Intertropical Convergence Zone (ITCZ) between similar to 1,145 and 555 calibrated calendar years before present (cal yr BP). Charcoal particles indicate that widespread fires occurred in the region, resulting from a combination of climate drivers and human agency during the entire span covered by the paleorecord. Following settlement by pastoral communities and the disappearance of endemic megafauna similar to 1,000 cal yr BP, grasslands expanded and the abundance of trees that rely on large animals for seed dispersal gradually declined. A reduction in the abundance of pollen taxa characteristic of dry forest coincided with an abrupt increase in charcoal particles between similar to 230 and 35 cal yr BP, when agro-pastoral communities immigrated into the region. Deforestation and soil erosion, indicated by a relatively rapid sedimentation rate and high K/Zr and Fe/Zr, intensified between 180 and 70 cal yr BP and caused a consequent increase in lake turbidity, resulting in more rapid turnover of the aquatic diatom community. Land use and ongoing climate change have continued to transform local terrestrial and freshwater ecosystems during the last similar to 70 years. The current composition of terrestrial and aquatic ecosystems reflects the legacy of extinction of native biota, invasion of exotic species, and diminished use of traditional land management practices.
英文关键词	agro-pastoralists environmental change dry deciduous forest aquatic ecosystems herbivore introductions socio-ecological systems
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000743302700001
WOS关键词	DIATOM ECOLOGICAL GUILDS ; MEGAFAUNAL EXTINCTIONS ; MIKEA FOREST ; POLLEN ; LEVEL ; CONSERVATION ; VARIABILITY ; ARCHAEOLOGY ; CHRONOLOGY ; MANAGEMENT
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/375691
作者单位	[Domic, Alejandra I.; Ivory, Sarah J.] Penn State Univ, Dept Geosci, University Pk, PA USA; [Domic, Alejandra I.; Douglass, Kristina G.] Penn State Univ, Dept Anthropol, University Pk, PA USA; [Domic, Alejandra I.; Ivory, Sarah J.] Penn State Univ, Earth & Environm Syst Inst, University Pk, PA USA; [Hixon, Sean W.; Kennett, Douglas J.] Univ Calif Santa Barbara, Dept Anthropol, Santa Barbara, CA 93106 USA; [Velez, Maria I.] Univ Regina, Dept Geol, Regina, SK, Canada; [Douglass, Kristina G.; Culleton, Brendan J.] Penn State Univ, Inst Energy & Environm, University Pk, PA 16802 USA; [Brenner, Mark; Curtis, Jason H.] Univ Florida, Dept Geol Sci, Gainesville, FL USA; [Brenner, Mark; Curtis, Jason H.] Univ Florida, Land Use & Environm Change Inst, Gainesville, FL USA
推荐引用方式 GB/T 7714	Domic, Alejandra I.,Hixon, Sean W.,Velez, Maria I.,et al. Influence of Late Holocene Climate Change and Human Land Use on Terrestrial and Aquatic Ecosystems in Southwest Madagascar[J],2021,9.
APA	Domic, Alejandra I..,Hixon, Sean W..,Velez, Maria I..,Ivory, Sarah J..,Douglass, Kristina G..,...&Kennett, Douglas J..(2021).Influence of Late Holocene Climate Change and Human Land Use on Terrestrial and Aquatic Ecosystems in Southwest Madagascar.FRONTIERS IN ECOLOGY AND EVOLUTION,9.
MLA	Domic, Alejandra I.,et al."Influence of Late Holocene Climate Change and Human Land Use on Terrestrial and Aquatic Ecosystems in Southwest Madagascar".FRONTIERS IN ECOLOGY AND EVOLUTION 9(2021).