scholarly journals A dryland river transformed—the Little Colorado, 1936–2010

Fact Sheet ◽  
2011 ◽  
Author(s):  
Debra L. Block ◽  
Margaret Hiza Redsteer
Keyword(s):  
Dryland River

scholarly journals VEGETATION, SOILS, AND HYDROGEOMORPHOLOGY OF RIPARIAN PATCH TYPES OF A DRYLAND RIVER

2006 ◽  
Vol 66 (1) ◽  
pp. 23-44 ◽  
Author(s):  
K. J. Bagstad ◽  
S. J. Lite ◽  
J. C. Stromberg
Keyword(s):  
Dryland River

scholarly journals Food resource variability in an Australian dryland river: evidence from the diet of two generalist native fish species

2008 ◽  
Vol 59 (2) ◽  
pp. 137 ◽  
Author(s):  
David Sternberg ◽  
Stephen Balcombe ◽  
Jonathan Marshall ◽  
Jaye Lobegeiger
Keyword(s):  
Fish Species ◽  
Food Resource ◽  
High Energy ◽  
Filamentous Algae ◽  
Boom And Bust ◽  
Dryland River ◽  
High Concentrations ◽  
Terrestrial Insects ◽  
Australian Fish ◽  
Resource Variability

To examine how food resource availability links with natural variation in primary productivity in the Moonie River, south-west Queensland, the diets of two native Australian fish species (Nematalosa erebi and Macquaria ambigua) were examined from fifteen waterholes in February, May and September 2006. N. erebi diets reflected strong ‘boom and bust’ patterns of food consumption, with high concentrations of benthic (non-filamentous) algae during boom (flow) times, moving to higher concentrations of filamentous algae and detritus during bust (no flow) periods. M. ambigua diets were primarily dominated by aquatic insects in all sampling periods. Although there was no clear ‘boom to bust’ pattern in relation to flow, M. ambigua secondary prey consumption revealed a compensatory switch between high energy prey (crustaceans) during more productive periods with terrestrial insects during less productive periods. The ability of both species of fish to switch from high to low concentrations of food quality under a variable environmental background allows them to persist through both high productive and low productive periods. This interaction between native biota and variable ‘boom’ and ‘bust’ conditions, and how changes to the natural hydrology will affect it is an important consideration of any future water resource development plans.

scholarly journals Ecosystem Responses to Water Resource Developments in a Large Dryland River

2018 ◽  
Vol 54 (9) ◽  
pp. 6643-6655 ◽  
Author(s):  
Martin Thoms ◽  
Michael Delong
Keyword(s):  
Water Resource ◽  
Ecosystem Responses ◽  
Dryland River

scholarly journals Increasing drought favors nonnative fishes in a dryland river: evidence from a multispecies demographic model

Ecosphere ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. e02681 ◽  
Author(s):  
Jane S. Rogosch ◽  
Jonathan D. Tonkin ◽  
David A. Lytle ◽  
David M. Merritt ◽  
Lindsay V. Reynolds ◽  
...  
Keyword(s):  
Demographic Model ◽  
Dryland River

Geomorphic change and biogeomorphic feedbacks in a dryland river: The Little Colorado River, Arizona, USA

2019 ◽  
Vol 131 (11-12) ◽  
pp. 1920-1942 ◽  
Author(s):  
D.J. Dean ◽  
D.J. Topping
Keyword(s):  
Colorado River ◽  
Peak Flow ◽  
Sediment Accumulation ◽  
Progressive Increase ◽  
Water Development ◽  
Spatial And Temporal Scales ◽  
Long Duration ◽  
Hydrologic Change ◽  
Dryland River ◽  
Channel Slope

Abstract The Little Colorado River in Arizona, United States, has undergone substantial geomorphic change since the late 1800s and early 1900s, consisting of sediment accumulation following an earlier period of likely widespread sediment evacuation. We analyzed hydrologic and geomorphic data at different spatial and temporal scales to determine the primary mechanisms responsible for these changes, and to provide context for periods of sediment evacuation and accumulation in other rivers. Peak-flow magnitude has progressively declined since the 1920s despite the occurrence of four alternating periods of high and low total annual flow. Largely coincident with this hydrologic change, the channel has narrowed between 72% and 88% in some reaches since the 1930s, with increases in sinuosity in wide alluvial valleys causing ∼21%–32% reductions in channel slope. Dense stands of vegetation colonized, and thus stabilized, the newly deposited floodplains. Although large, long-duration floods caused some channel widening, these floods have been too infrequent to offset the progressive narrowing. Channel narrowing, increases in sinuosity, decreases in slope, and increases in vegetative roughness appear to have caused biogeomorphic feedbacks, thereby exacerbating sediment deposition, disrupting flood conveyance, and contributing to decreases in peak-flow magnitude and in sediment transport. The progressive increase in water development in parts of the basin has also likely contributed to progressive declines in peak flow. These results show that biogeomorphic feedback processes combined with human water development may be as important as, if not more important than, changes in climate in driving hydrologic, geomorphic, and sediment-load change in dryland river environments.

scholarly journals Grain-size variability of point-bar deposits from a fine-grained dryland river terminus, Southern Altiplano, Bolivia

2020 ◽  
Vol 403 ◽  
pp. 105663 ◽  
Author(s):  
Jiaguang Li ◽  
Jef Vandenberghe ◽  
Nigel P. Mountney ◽  
Stefan M. Luthi
Keyword(s):  
Grain Size ◽  
Point Bar ◽  
Fine Grained ◽  
Dryland River ◽  
Size Variability

A perspective on dryland river ecosystems

1995 ◽  
Vol 11 (1) ◽  
pp. 85-104 ◽  
Author(s):  
K. F. Walker ◽  
F. Sheldon ◽  
J. T. Puckridge
Keyword(s):  
River Ecosystems ◽  
Dryland River
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