Arid
DOI10.1016/j.geomorph.2017.07.016
Incorporating ecogeomorphic feedbacks to better understand resiliency in streams: A review and directions forward
Atkinson, Carla L.1; Allen, Daniel C.2; Davis, Lisa3; Nickerson, Zachary L.1
通讯作者Atkinson, Carla L.
会议名称48th Annual Binghamton Geomorphology Symposium
会议日期OCT 13-15, 2017
会议地点San Marcos, TX
英文摘要

Decades of interdisciplinary research show river form and function depends on interactions between the living and nonliving world, but a dominant paradigm underlying ecogeomorphic work consists of a top-down, unidirectional approach with abiotic forces driving biotic systems. Stream form and location within the stream network does dictate the habitat and resources available for organisms and overall community structure. Yet this traditional hierarchal framework on its own is inadequate in communicating information regarding the influence of biological systems on fluvial geomorphology that lead to changes in channel morphology, sediment cycling, and system-scale functions (e.g., sediment yield, biogeochemical nutrient cycling). Substantial evidence that organisms influence fluvial geomorphology exists, specifically the ability of aquatic vegetation and lotic animals to modify flow velocities and sediment deposition and transport thus challenging the traditional hierarchal framework. Researchers recognize the need for ecogeomorphic frameworks that conceptualize feedbacks between organisms, sediment transport, and geomorphic structure. Furthermore, vital ecosystem processes, such as biogeochemical nutrient cycling represent the conversations that are occurring between geomorphological and biological systems. Here we review and synthesize selected case studies highlighting the role organisms play in moderating geomorphic processes and likely interact with these processes to have an impact on an essential ecosystem process, biogeochemical nutrient recycling. We explore whether biophysical interactions can provide information essential to improving predictions of system-scale river functions, specifically sediment transport and biogeochemical cycling, and discuss tools used to study these interactions. We suggest that current conceptual frameworks should acknowledge that hydrologic, geomorphologic, and ecologic processes operate on different temporal scales, generating bidirectional feedback loops over space and time. Hydro- and geomorphologic processes, operating episodically during bankfull conditions, influence ecological processes (e.g., biogeochemical cycling) occurring over longer time periods during base-flow conditions. This ecological activity generates the antecedent conditions that influence the hydro- and geomorphologic processes occurring during the next high flow event, creating a bidirectional feedback. This feedback should enhance the resiliency of fluvial landforms and ecosystem processes, allowing physical and biological processes to pull and push against each other over time. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词Biogeochemical cycling Biophysical interactions Ecosystem function Sediment transport Bankfull vs. base flows
来源出版物GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2018
卷号305
页码123-140
出版者ELSEVIER SCIENCE BV
类型Article;Proceedings Paper
语种英语
国家USA
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000427102800010
WOS关键词LARGE WOODY DEBRIS ; FRESH-WATER MUSSELS ; CRAYFISH PACIFASTACUS-LENIUSCULUS ; MACROPHYTE JUSTICIA-AMERICANA ; AIRBORNE LIDAR DATA ; ECOSYSTEM ENGINEERS ; HEADWATER STREAMS ; DESERT STREAM ; HABITAT MODIFICATION ; NUTRIENT LIMITATION
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/307348
作者单位1.Univ Alabama, Dept Biol, Tuscaloosa, AL 35487 USA;
2.Univ Oklahoma, Dept Biol, Ecol & Evolutionary Biol Grad Program, Norman, OK 73019 USA;
3.Univ Alabama, Dept Geog, Tuscaloosa, AL 35487 USA
推荐引用方式
GB/T 7714
Atkinson, Carla L.,Allen, Daniel C.,Davis, Lisa,et al. Incorporating ecogeomorphic feedbacks to better understand resiliency in streams: A review and directions forward[C]:ELSEVIER SCIENCE BV,2018:123-140.
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