Identifying Suitable Habitat for Chinook Salmon across a Large, Glaciated Watershed

Bidlack, Allison; Benda, Lee; Miewald, Tom; Reeves, Gordon H.; McMahan, Gabriel

doi:10.1080/00028487.2014.880739

Cited by 27 publications

(33 citation statements)

References 27 publications

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“…Ultimately, coupling the isotope‐based continuous method of assignment with habitat models, which assume that suitable aquatic habitat for fishes is influenced by the geomorphic structure of watersheds (e.g., Intrinsic Potential models; Bidlack et al. ), will likely improve estimates of production patterns.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, such geomorphic attributes of streams are effective as priors within a spatially continuous Bayesian assignment framework for migratory fish. Ultimately, coupling the isotope-based continuous method of assignment with habitat models, which assume that suitable aquatic habitat for fishes is influenced by the geomorphic structure of watersheds (e.g., Intrinsic Potential models; Bidlack et al 2014), will likely improve estimates of production patterns.…”

Section: Characterizing Production Patterns Via Binary Transformationmentioning

confidence: 99%

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Linking otolith microchemistry and dendritic isoscapes to map heterogeneous production of fish across river basins

Brennan

Schindler

2017

Ecological Applications

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Production patterns of highly mobile species, such as anadromous fish, often exhibit high spatial and temporal heterogeneity across landscapes. Such variability is often asynchronous in time among habitats, which stabilizes production at aggregate scales of complexity. Reconstructing production patterns explicitly in space and time across multiple scales, however, remains difficult but is important for prioritizing habitat conservation. This is especially true for fishes inhabiting river basins due to long-range dispersal, high mortality at early life stages, complex population structure and elusive life history variation. We develop a new approach for mapping production patterns of Pacific salmon across a large river basin by integrating otolith microchemistry and dendritic isoscape models. The geographically continuous Bayesian assignment framework presented here yielded high accuracies (>90%) and relatively high precisions (precisions <4%; i.e., assignment areas of <530 river km of the 13 100 km total river length) when used to determine the natal source of known-origin juvenile Chinook salmon captured throughout the study region. Integrating these methods enabled us to base estimates of provenance and habitat use of individuals on a per location basis using strontium isotopic data throughout the continuous spatial domain of a river network. Such a framework provides substantial advantages over the more common nominal approach to employing otolith microchemistry to reconstruct movement patterns of fish. In doing so, we reconstructed the spatial production patterns of adult Chinook salmon returning to a large watershed in Bristol Bay, Alaska and illustrate the power of such an approach to conservation efforts.

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Section: Discussionmentioning

confidence: 99%

Section: Characterizing Production Patterns Via Binary Transformationmentioning

confidence: 99%

Linking otolith microchemistry and dendritic isoscapes to map heterogeneous production of fish across river basins

Brennan

Schindler

2017

Ecological Applications

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“…The Copper River basin (61,952 km 2 ) is a large contributor to the Gulf of Alaska (GOA) and contains the one of the most important salmon habitats in Alaska for commercial and subsistence uses. Its resources are under increasing pressure with elevated use and development not only from fishing but also from mining, cabin building, recreational boating, off‐road vehicles, and the Trans‐Alaska Pipeline (Bidlack et al, ). The basin is also highly glacierized, and retreating glaciers are expected to affect the future timing and magnitude of its hydrology.…”

Section: Introductionmentioning

confidence: 99%

A Physically Based Daily Simulation of the Glacier‐Dominated Hydrology of the Copper River Basin, Alaska

Beusekom

Viger

2018

Water Resources Research

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The large, highly glacierized Copper River basin is an important water resource for the south‐central region of Alaska. Thus, information is needed on the reaction of its hydrologic timing and streamflow volumes to historical changes in climate, in order to assess the possible impact of future changes. However, the basin is remote, and therefore, it has proved difficult to collect field data in a frequent temporal and spatial manner. An extension of the distributed‐parameter, physical‐process code Precipitation Runoff Modeling System, PRMSglacier, has been specifically developed to simulate daily hydrology without requiring extensive input data. In this study, PRMSglacier was used to characterize the hydrology of the Copper River basin from 1959 to 2015. The basin was split into subbasins for specific regional climatic calibrations and finer resolution characterization. The model was calibrated and performed well against data of glacier mass balance, glacier area change, snow cover, gaged streamflow, evapotranspiration, and solar radiation. Ice melt contributed 26% of the total basin streamflow, with differences temporally from climate oscillations. Furthermore, differences were seen geographically in subbasins depending on the state of the glaciers in each subbasin. Decreasing trends in ice melt volume were mostly seen on smaller steeper glaciers responding to a critical level of glacier recession, while increasing trends in ice melt volume were mostly seen on larger valley glaciers responding to increasing temperature. The areas with substantially decreasing ice melt had decreasing streamflow, possibly indicating health concerns for the ecosystems therein.

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“…; Bidlack et al. ). Further, they provide insights into the potential conditions that fishes may face in areas and times that are impossible to comprehensively sample and are a useful first step towards understanding critical fish habitats.…”

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confidence: 98%

An Interferometric Synthetic Aperture Radar (InSAR) Habitat Suitability Model to Identify Overwinter Conditions for Coregonine Whitefishes in Arctic Lagoons

et al. 2018

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Lagoons provide critical habitats for many fishes, including coregonine whitefishes, which are a mainstay in many subsistence fisheries of rural communities in Arctic Alaska. Despite their importance, little is known about the overwintering habits of whitefishes in Arctic Alaska due to the challenges associated with sampling during winter. We developed a habitat suitability (HS) model to understand the potential range of physical conditions that whitefishes experience during the Arctic winter, using three indicator lagoons that represent a range of environmental characteristics. The HS model was built using a three‐step approach. First, remote sensing that uses interferometric synthetic aperture radar (InSAR) identified areas of floating and bottomfast ice. Second, through in‐field ground‐truthing, we confirmed the presence and quality of liquid water (water depth, temperature, and dissolved oxygen) beneath the ice cover. Third, we assessed the suitability of that liquid water as habitat for whitefishes based on published literature and expert interpretation of water quality parameters. InSAR determined that 0, 65.4, and 88.2% of the three lagoons were composed of floating ice corresponding with areas of liquid water beneath a layer of ice. The HS model indicated that all three lagoons had reduced suitability as whitefish habitat in winter than in summer due to the loss of habitat because of the presence of bottomfast ice and a reduction in the quality of liquid water due to cold temperatures, high salinities, and low dissolved oxygen levels. However, only the shallowest lagoon had lethal conditions and zero suitability as whitefish habitat. The methods outlined here provide a simple, cost‐effective method to identify habitats that consistently provide critical winter habitat and integrate remote sensing in a HS model framework.

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Identifying Suitable Habitat for Chinook Salmon across a Large, Glaciated Watershed

Cited by 27 publications

References 27 publications

Linking otolith microchemistry and dendritic isoscapes to map heterogeneous production of fish across river basins

Linking otolith microchemistry and dendritic isoscapes to map heterogeneous production of fish across river basins

A Physically Based Daily Simulation of the Glacier‐Dominated Hydrology of the Copper River Basin, Alaska

An Interferometric Synthetic Aperture Radar (InSAR) Habitat Suitability Model to Identify Overwinter Conditions for Coregonine Whitefishes in Arctic Lagoons

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