Glacier Bay National Park and Preserve: Natural resource condition assessment

Nadeau, Andy; Allen, Kathy; Davis, Anna; Gardner, Sarah; Benck, Kevin; Komp, Mike; Meinke, Lonnie; Zanon, Jacob; Robertson, Andrew

The Natural Resource Condition Assessment (NRCA) Program aims to provide documentation about the current conditions of important park natural resources through a spatially explicit, multi-disciplinary synthesis of existing scientific data and knowledge. Findings from the NRCA will help Glacier Bay National Park and Preserve (GLBA) managers to develop near-term management priorities, engage in watershed or landscape scale partnership and education efforts, conduct park planning, and report program performance (e.g., Department of the Interior’s Strategic Plan “land health” goals, Government Performance and Results Act). The objectives of this assessment are to evaluate and report on current conditions of key park resources, to evaluate critical data and knowledge gaps, and to highlight selected existing stressors and emerging threats to resources or processes. For the purpose of this NRCA, staff from the National Park Service (NPS) and Saint Mary’s University of Minnesota – Geospatial Services (SMUMN GSS) identified key resources, referred to as “components” in the project. The selected components include natural resources and processes that are currently of the greatest concern to park management at GLBA. The final project framework contains 24 resource components, each featuring discussions of measures, stressors, and reference conditions. This study involved reviewing existing literature and, where appropriate, analyzing data for each natural resource component in the framework to provide summaries of current condition and trends in selected resources. When possible, existing data for the established measures of each component were analyzed and compared to designated reference conditions. A weighted scoring system was applied to calculate the current condition of each component. Weighted Condition Scores, ranging from zero to one, were divided into three categories of condition: good condition, moderate concern, and significant concern. These scores help to determine the current overall condition of each resource. The discussions for each component, found in Chapter 4 of this report, represent a comprehensive summary of current available data and information for these resources, including unpublished park information and perspectives of park resource managers, and present a current condition designation when appropriate. Each component assessment was reviewed by GLBA resource managers, NPS Southeast Alaska Network staff, or outside experts. Existing literature, short- and long-term datasets, and input from NPS and other outside agency scientists support condition designations for components in this assessment. However, in some cases, data were unavailable or insufficient for several of the measures of the featured components. In other instances, data establishing reference condition were limited or unavailable for components, making comparisons with current information inappropriate or invalid. In these cases, it was not possible to assign condition for the components. Current condition was not able to be determined for four (sea ducks, breeding landbirds, mid-trophic level marine forage community, and air quality) of the 24 components (16.7%) due to these data gaps. For those components with sufficient available data, the overall condition varied. Thirteen components were determined to be in good condition (marine shoreline, murrelets, glaucous-winged gulls, moose, bears, mountain goat, humpback whales, sea otters, harbor porpoise, Steller sea lions, anadromous fish, water quality, and wilderness). Five components (harvested marine invertebrates – Tanner crabs, Pacific halibut, western toad, plants, and underwater soundscape) were of moderate concern. Three components were determined to be of significant concern (glaciers, harvested marine invertebrates – weathervane scallops, and harbor seals).

Glacier Bay National Park and Preserve: Natural resource condition assessment

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