scholarly journals Foraging behaviour and optimal microhabitat selection in Yukon River Basin nonanadromous Dolly Varden Charr ( Salvelinus malma )

2019 ◽  
Vol 28 (4) ◽  
pp. 586-601 ◽  
Author(s):  
Bryan Bozeman ◽  
Gary Grossman
Keyword(s):  
River Basin ◽  
Foraging Behaviour ◽  
Microhabitat Selection ◽  
Dolly Varden ◽  
Salvelinus Malma ◽  
Yukon River ◽  
Yukon River Basin

Mercury Export from the Yukon River Basin and Potential Response to a Changing Climate

2011 ◽  
Vol 45 (21) ◽  
pp. 9262-9267 ◽  
Author(s):  
Paul F. Schuster ◽  
Robert G. Striegl ◽  
George R. Aiken ◽  
David P. Krabbenhoft ◽  
John F. Dewild ◽  
...  
Keyword(s):  
River Basin ◽  
Potential Response ◽  
Changing Climate ◽  
Yukon River ◽  
Yukon River Basin

A novel application of an adaptive surrogate-based modeling optimization (ASMO) for the Community Territory System Model (CTSM) in Alaska

2021 ◽  
Author(s):  
Yifan Cheng ◽  
Andrew Newman ◽  
Sean Swenson ◽  
David Lawrence ◽  
Anthony Craig ◽  
...  
Keyword(s):  
High Resolution ◽  
River Basin ◽  
Land Surface ◽  
Computational Cost ◽  
Reanalysis Data ◽  
Freshwater Ecosystems ◽  
System Model ◽  
Surface Model ◽  
Yukon River ◽  
Yukon River Basin

<p>Climate-induced changes in snow cover, river flow, and freshwater ecosystems will greatly affect the indigenous groups in the Alaska and Yukon River Basin. To support policy-making on climate adaptation and mitigation for these underrepresented groups, an ongoing interdisciplinary effort is being made to combine Indigenous Knowledge with western science (https://www.colorado.edu/research/arctic-rivers/).</p><p>A foundational component of this project is a high fidelity representation of the aforementioned land surface processes. To this end, we aim to obtain a set of reliable high-resolution parameters for the Community Territory System Model (CTSM) for the continental scale domain of Alaska and the entire Yukon River Basin, which will be used in climate change simulations. CTSM is a complex, physically based state-of-the-science land surface model that includes complex vegetation and canopy representation, a multi-layer snow model, as well as hydrology and frozen soil physics necessary for the representation of streamflow and permafrost. Two modifications to the default CTSM configuration were made. First, we used CTSM that is implemented with hillslope hydrology to better capture the fine-scale hydrologic spatial heterogeneity in complex terrain. Second, we updated the input soil textures and organic carbon in CTSM using the high-resolution SoilGrid dataset.</p><p>In this study, we performed a multi-objective optimization on snow and streamflow metrics using an adaptive surrogate-based modeling optimization (ASMO). ASMO permits optimization of complex land-surface models over large domains through the use of surrogate models to minimize the computational cost of running the full model for every parameter combination. We ran CTSM at a spatial resolution of 1/24<sup>th</sup> degree and a temporal resolution of one hour using the ERA5 reanalysis data as the meteorological forcings. The ERA5 reanalysis data were bias-corrected to account for the orographic effects. We will discuss the ASMO-CTSM coupling workflow, performance characteristics of the optimization (e.g., computational cost, iterations), and comparisons of the default configuration and optimized model performance.</p>

Aggressive interactions affect foraging and use of space in a drift foraging salmonid, Salvelinus malma (Salmoniformes: Salmonidae)

2019 ◽  
Vol 187 (3) ◽  
pp. 774-781 ◽  
Author(s):  
Jeffrey L Cullen ◽  
Gary D Grossman
Keyword(s):  
Foraging Behaviour ◽  
Field Studies ◽  
Habitat Choice ◽  
Dolly Varden ◽  
Salvelinus Malma ◽  
Intraspecific Interactions ◽  
Use Of Space ◽  
Aggressive Interactions ◽  
Dolly Varden Char ◽  
Alaskan Stream

Abstract Although intraspecific interactions likely affect habitat choice and foraging behaviour in animals, our knowledge regarding how these factors interact is frequently limited to either lab or field studies, but not both. We observed pairs of dominant and subordinate drift-foraging Dolly Varden char (Salvelinus malma) in an Alaskan stream, and quantified intraspecific interactions and foraging behaviour. Dominant individuals had higher foraging rates, occupied slower holding velocities and were displaced shorter distances during bouts compared to subordinate individuals. Individuals initiated bouts more frequently from the downstream position, than from lateral or upstream positions. Dominant individuals were more likely to occupy the upstream position after a bout than subordinates, which ensures that dominants have the first opportunity to capture drifting prey.

Estimations of Evapotranspiration and Water Balance with Uncertainty over the Yukon River Basin

2012 ◽  
Vol 26 (8) ◽  
pp. 2147-2157 ◽  
Author(s):  
Wenping Yuan ◽  
Shuguang Liu ◽  
Shunlin Liang ◽  
Zhengxi Tan ◽  
Heping Liu ◽  
...  
Keyword(s):  
Water Balance ◽  
River Basin ◽  
Yukon River ◽  
Yukon River Basin

scholarly journals An estimate of carbon emissions from 2004 wildfires across Alaskan Yukon River Basin

2007 ◽  
Vol 2 (1) ◽  
Author(s):  
Zhengxi Tan ◽  
Larry L Tieszen ◽  
Zhiliang Zhu ◽  
Shuguang Liu ◽  
Stephen M Howard
Keyword(s):  
River Basin ◽  
Carbon Emissions ◽  
Yukon River ◽  
Yukon River Basin
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