Hydrological functioning of a beaver dam sequence and regional dam persistence during an extreme rainstorm

2020 ◽  
Vol 34 (18) ◽  
pp. 3726-3737 ◽  
Author(s):  
Cherie J. Westbrook ◽  
Amanda Ronnquist ◽  
Angela Bedard‐Haughn
Keyword(s):  
Beaver Dam ◽  
Hydrological Functioning

scholarly journals Thermal Characteristics of a Beaver Dam Analogues Equipped Spring-Fed Creek in the Canadian Rockies

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 990
Author(s):  
Tariq M. Munir ◽  
Cherie J. Westbrook
Keyword(s):  
Thermal Characteristics ◽  
Cutthroat Trout ◽  
Rocky Mountain ◽  
Optimal Growth ◽  
Stream Temperature ◽  
Mountain Stream ◽  
Suitable Habitat ◽  
Restoration Technique ◽  
Beaver Dam ◽  
In Series

Beaver dam analogues (BDAs) are becoming an increasingly popular stream restoration technique. One ecological function BDAs might help restore is suitable habitat conditions for fish in streams where loss of beaver dams and channel incision has led to their decline. A critical physical characteristic for fish is stream temperature. We examined the thermal regime of a spring-fed Canadian Rocky Mountain stream in relation to different numbers of BDAs installed in series over three study periods (April–October; 2017–2019). While all BDA configurations significantly influenced stream and pond temperatures, single- and double-configuration BDAs incrementally increased stream temperatures. Single and double configuration BDAs warmed the downstream waters of mean maxima of 9.9, 9.3 °C by respective mean maxima of 0.9 and 1.0 °C. Higher pond and stream temperatures occurred when ponding and discharge decreased, and vice versa. In 2019, variation in stream temperature below double-configuration BDAs was lower than the single-configuration BDA. The triple-configuration BDA, in contrast, cooled the stream, although the mean maximum stream temperature was the highest below these structures. Ponding upstream of BDAs increased discharge and resulted in cooling of the stream. Rainfall events sharply and transiently reduced stream temperatures, leading to a three-way interaction between BDA configuration, rainfall and stream discharge as factors co-influencing the stream temperature regime. Our results have implications for optimal growth of regionally important and threatened bull and cutthroat trout fish species.

scholarly journals Prevalence and degree of hearing loss among males in Beaver Dam cohort: Comparison of veterans and nonveterans

2010 ◽  
Vol 47 (6) ◽  
pp. 505 ◽  
Author(s):  
Richard H. Wilson ◽  
Colleen M. Noe ◽  
Karen J. Cruickshanks ◽  
Terry L. Wiley ◽  
David M. Nondahl
Keyword(s):  
Hearing Loss ◽  
Cohort Comparison ◽  
Beaver Dam

Beaver-dam-like membrane: A robust and sulphifilic MgBO2(OH)/CNT/PP nest separator in Li-S batteries

2017 ◽  
Vol 8 ◽  
pp. 153-160 ◽  
Author(s):  
Long Kong ◽  
Hong-Jie Peng ◽  
Jia-Qi Huang ◽  
Wancheng Zhu ◽  
Ge Zhang ◽  
...  
Keyword(s):  
Beaver Dam

scholarly journals Colonization of the Beaufort Coastal Plain by Beaver (Castor canadensis): A Response to Shrubification of the Tundra?

2017 ◽  
Vol 130 (4) ◽  
pp. 332 ◽  
Author(s):  
Thomas S Jung ◽  
Jay Frandsen ◽  
Danny C Gordon ◽  
David H Mossop
Keyword(s):  
Coastal Plain ◽  
Castor Canadensis ◽  
The Arctic ◽  
Beaver Dam ◽  
Winter Food ◽  
Western Arctic ◽  
Food Cache ◽  
Key Driver ◽  
River Valleys ◽  
American Beaver

A consequence of rapid global warming has been the shrubification (increase in shrub abundance, cover, and biomass) of arctic and alpine tundra ecosystems. Shrubification is likely a key driver of predicted and observed changes in the biodiversity of the Arctic. The American Beaver (Castor canadensis) has a vast distributional range, covering most of north America below the tree line; however, it has not been recorded in tundra habitat of the Beaufort Coastal Plain of Yukon and Alaska. in 2015, we observed a beaver dam, lodge, and winter food cache on the Babbage River in Ivvavik National Park, Yukon, Canada. Local Inuvialuit hunters first observed beavers on two rivers immediately east of the Babbage River in 2008 and 2009. Together, these are the first observations of beavers on the Beaufort Coastal Plain and indicate initial attempts at colonization. Colonization of the Beaufort Coastal Plain by beavers may have been facilitated by shrubification of river valleys on the tundra of northern Yukon and adjacent Alaska, which is a consequence of rapid climate warming in the western Arctic.

scholarly journals Estimating evaporation from a wet grassland

2007 ◽  
Vol 11 (1) ◽  
pp. 270-282 ◽  
Author(s):  
D. L. Gasca-Tucker ◽  
M. C. Acreman ◽  
C. T. Agnew ◽  
J. R. Thompson
Keyword(s):  
Water Availability ◽  
Meteorological Data ◽  
Correlation Method ◽  
Eddy Correlation ◽  
Direct Measurements ◽  
Wet Grassland ◽  
Wet Grasslands ◽  
The Uk ◽  
Crop Coefficients ◽  
Hydrological Functioning

Abstract. Wet grasslands are being restored across the UK and Europe to reinstate their high biodiversity following over 50 years of drainage and conversion to arable agriculture. The water balance of many wet grasslands is dominated by precipitation and evaporation and it is essential to quantify evaporation rates to understand the hydrological functioning of wetlands and the implications for water resources in catchments where wetlands are being restored. This paper considers data from direct measurements of evaporation from the Pevensey Levels wet grassland using the eddy correlation method. Equations are derived to predict actual evaporation using meteorological data on the site or from standard meteorological station observations. It was found that evaporation could be estimated reliably from meteorological variables, such as wind speed, temperature and humidity and by water availability. It was also found that when water availability is high, evaporation is high and may exceed reference evaporation values, raising questions over the deployment of the two-step Penman-Monteith model unless reliable crop coefficients and relative evaporation figures can be determined.

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