Sorting of Seeds by Hydrochory
S. Chambert,C. S. James +1 more
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In this article, a conceptual model is proposed to identify the hydraulic processes involved in the hydrochory pathway that may lead to differential response of different seed types and hence their sorting.Abstract:
The species composition of riparian vegetation is determined by a variety of processes, including the dispersal of seeds. The seed types that end up at certain locations are determined by their particular characteristics as well as the prevailing hydrology and the physical characteristics of the river channel. A conceptual model is proposed to identify the hydraulic processes involved in the hydrochory pathway that may lead to differential response of different seed types and hence their sorting. The results of a series of laboratory experiments are presented to demonstrate the sorting between seed types by these processes. The behaviour of non-buoyant seeds during settling and entrainment is shown to be consistent with that of mineral sediments, and their sorting can therefore be described by existing sediment transport theory. Significant sorting of buoyant seed types takes place during transport under the influence of wind and during ingress into marginal emergent vegetation, trapping by vegetation and stranding during receding flows on sloping channel banks. Copyright © 2008 John Wiley & Sons, Ltd.read more
Citations
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Hydrodynamics of vegetated channels
TL;DR: In this article, the authors highlight some recent trends in vegetation hydrodynamics, focusing on conditions within channels and spanning spatial scales from individual blades, to canopies or vegetation patches, to the channel reach.
Journal ArticleDOI
The role of hydrochory in structuring riparian and wetland vegetation
TL;DR: The state of the art of the discipline is defined and hydrochory is defined to be an important vector for the spread of many invasive species, but there is also the potential for enhancing ecosystem restoration by improving or restoring water dispersal pathways.
Journal ArticleDOI
Effects of vegetation distribution on experimental river channel dynamics
TL;DR: In this paper, the authors compared anemochorously distributed vegetation and uniformly distributed vegetation on the floodplain of a single-thread meandering river and concluded that the vegetation seeds distributed by the flow during floods lead to island braiding.
Journal ArticleDOI
The importance of seasonal flow timing for riparian vegetation dynamics: a systematic review using causal criteria analysis
TL;DR: In this article, a systematic review of the literature on the importance of seasonal flow timing for riparian plants was conducted using causal criteria analysis, and the authors found sufficient evidence to provide strong support for the existence of causal relations between seasonal flow times and a number of riparian plant processes, namely rates of waterborne dispersal (hydrochory), germination and growth, as well as riparian community composition.
Journal ArticleDOI
Consequences of propagule dispersal and river fragmentation for riparian plant community diversity and turnover
TL;DR: Experimental evidence that water dispersal of plant propagules influences colonization dynamics and is important for long-term community development in riparian zones is provided and hydrochory (plant dispersal by water) may be more important for maintenance of diversity in regulated systems where long-distance dispersal is absent or negligible.
References
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Journal ArticleDOI
The Ecology of Interfaces: Riparian Zones
Robert J. Naiman,Henri Décamps +1 more
TL;DR: Riparian zones possess an unusually diverse array of species and environmental processes as discussed by the authors, related to variable flood regimes, geographically unique channel processes, altitudinal climate shifts, and upland influences on the fluvial corridor.
Book
Physicochemical and Environmental Plant Physiology
TL;DR: In the fourth edition of the book as discussed by the authors, the authors have taken into consideration extensive reviews performed by colleagues and students who have touted this book as the ultimate reference for research and learning.
BookDOI
Principles of dispersal in higher plants.
TL;DR: This chapter discusses the evolution of Dispersal Organs in General, and discusses the role of dispersal strategy and the Biocoenosis in this process.
The Bed-Load Function for Sediment Transportation in Open Channel Flows
Abstract: CONTENTS Page Introduction. 1 Approach to the problem. _ 3 Limitation of the bed-load function _ _ _ 4 The undetermined function 4 The alluvial stream. 5 The sediment mixture 6 Hydraulics of the alluvial channel. 7 The friction formula 7 The friction factor 8 Resistance of the bars 9 The laminar sublayer 10 The transition between hydraulically rough and smooth beds_ 12 The velocity fluctuations 13 Suspension 14 The transportation rate of suspended load 17 Integration of the suspended load. _ 17 Numerical integration of suspended load 19 Limit of suspension. 24 The bed layer 24 Practical calculation of suspended load___ ____ 25 Numerical example 26 Page Bed-load concept 29 Some constants entering the laws of bed-load motion: 31 The bed-load equation 32 The exchange time 33 The exchange probability 34 Determination of the probability V 35 Transition between bed load and. suspended load 38 The necessary graphs 40 Flume tests with sediment mixtures.. 42 Sample calculation of a river reachl 44 Choice of a river reach 45 Description of a river reach_____ 45 Application of procedure to Big Sand Creek, Miss 46 Discussion of calculations 60 Limitations of the method____ 65 Summary. 67 Literature cited 68 Appendix 69 List of symbols. 69 Work charts _ 71
Journal ArticleDOI
A New Roundness Scale for Sedimentary Particles
TL;DR: A new roundness scale is proposed defined by six roundness classes, defined by two sets of clay models prepared to characterize each roundness class and photographed to determine the roundness of a particle by comparison.
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