Flood Pulsing and Metacommunity Dynamics in a Desert Riparian Ecosystem

Questions: 1. Does flood pulsing drive metacommunity dynamics and provide insurance against catastrophic flooding in desert southwestern riparian ecosystems? 2. Do upland and wetland species in the floodplain differ in their dynamics? Location: Southwestern USA. Methods: We sampled vegetation and pr...

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Bibliographische Detailangaben
Veröffentlicht in:	Journal of Vegetation Science. - Opulus Press. - 19(2008), 3, Seite 373-380
1. Verfasser:	Boudell, Jere A. (VerfasserIn)
Weitere Verfasser:	Stromberg, Juliet C.
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2008
Zugriff auf das übergeordnete Werk:	Journal of Vegetation Science
Schlagworte:	Community dynamics Disturbance dynamics Population dynamics Seed bank Seed dispersal Physical sciences Biological sciences


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041			\|a eng
100	1		\|a Boudell, Jere A. \|e verfasserin \|4 aut
245	1	0	\|a Flood Pulsing and Metacommunity Dynamics in a Desert Riparian Ecosystem
264		1	\|c 2008
336			\|a Text \|b txt \|2 rdacontent
337			\|a Computermedien \|b c \|2 rdamedia
338			\|a Online-Ressource \|b cr \|2 rdacarrier
520			\|a Questions: 1. Does flood pulsing drive metacommunity dynamics and provide insurance against catastrophic flooding in desert southwestern riparian ecosystems? 2. Do upland and wetland species in the floodplain differ in their dynamics? Location: Southwestern USA. Methods: We sampled vegetation and propagule banks in four communities along a floodplain hydrogradient. Plant species were classified as wetland or upland and community wetland indicator scores were calculated. ANOVA tested for differences between data categories amongst communities (extant vegetation and propagule banks) and soil depths. Sørensen's similarity coefficient was calculated to determine compositional similarity between vegetation and propagule banks. Results: Community propagule banks had high similarity indicating broad dispersal by flood waters. Wetland propagules were present in soils from channel bars to floodplain edges, despite declines in wetland vegetation with distance from channel. Wetland communities in propagule banks were dissimilar from those in vegetation except on channel bars. Upland species (vegetation and propagule banks) increased with distance from channel. Propagules of upland species were most abundant in the litter, and were compositionally similar to upland species in most communities. Conclusions: Flood pulsing is one mechanism that drives spatiotemporal metacommunity dynamics in dynamic desert riparian ecosystems. The homogenized regional propagule bank created by flood pulsing provides wetland species with a mechanism to escape local extinction by allowing for recolonization after flooding creates suitable establishment conditions. Upland species are able to germinate from in-situ sources after small-scale flooding or rainfall moistens soil. In fluctuating environments, these dynamics sustain biodiversity in the face of ongoing environmental change.
540			\|a Copyright The International Association for Vegetation Science
650		4	\|a Community dynamics
650		4	\|a Disturbance dynamics
650		4	\|a Population dynamics
650		4	\|a Seed bank
650		4	\|a Seed dispersal
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Land \|x Rangelands \|x Wetlands
650		4	\|a Biological sciences \|x Biology \|x Biological taxonomies \|x Species
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Geomorphology \|x Topography \|x Highlands
650		4	\|a Biological sciences \|x Biology \|x Botany \|x Plant ecology \|x Vegetation
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Geomorphology \|x Landforms \|x Fluvial landforms \|x Alluvial landforms \|x Alluvial plains \|x Floodplains
650		4	\|a Biological sciences \|x Ecology \|x Ecological processes \|x Ecosystem dynamics
650		4	\|a Biological sciences \|x Ecology \|x Aquatic ecology \|x Marine ecology \|x Riparian ecology
650		4	\|a Biological sciences \|x Ecology \|x Aquatic ecology \|x Wetland ecology
650		4	\|a Biological sciences \|x Biology \|x Botany \|x Plants
650		4	\|a Biological sciences \|x Agriculture \|x Agricultural sciences \|x Agronomy \|x Soil science \|x Soils \|x Riparian soils
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Land \|x Rangelands \|x Wetlands
650		4	\|a Biological sciences \|x Biology \|x Biological taxonomies \|x Species
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Geomorphology \|x Topography \|x Highlands
650		4	\|a Biological sciences \|x Biology \|x Botany \|x Plant ecology \|x Vegetation
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Geomorphology \|x Landforms \|x Fluvial landforms \|x Alluvial landforms \|x Alluvial plains \|x Floodplains
650		4	\|a Biological sciences \|x Ecology \|x Ecological processes \|x Ecosystem dynamics
650		4	\|a Biological sciences \|x Ecology \|x Aquatic ecology \|x Marine ecology \|x Riparian ecology
650		4	\|a Biological sciences \|x Ecology \|x Aquatic ecology \|x Wetland ecology
650		4	\|a Biological sciences \|x Biology \|x Botany \|x Plants
650		4	\|a Biological sciences \|x Agriculture \|x Agricultural sciences \|x Agronomy \|x Soil science \|x Soils \|x Riparian soils
655		4	\|a research-article
700	1		\|a Stromberg, Juliet C. \|e verfasserin \|4 aut
773	0	8	\|i Enthalten in \|t Journal of Vegetation Science \|d Opulus Press \|g 19(2008), 3, Seite 373-380 \|w (DE-627)329555960 \|w (DE-600)2047714-4 \|x 16541103 \|7 nnns
773	1	8	\|g volume:19 \|g year:2008 \|g number:3 \|g pages:373-380
856	4	0	\|u https://www.jstor.org/stable/25173208 \|3 Volltext
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951			\|a AR
952			\|d 19 \|j 2008 \|e 3 \|h 373-380