Evaluation and Proposed Refinement of the Sampling Design for the Long Term Resource Monitoring Program's Fish Component
Abstract : Environmental monitoring programs are frequently designed to track changes in key physical, chemical, and biological features of an ecosystem. As such, these programs provide critical information for detecting changes in system state, investigating causal mechanisms of the observed changes, and making resource management decisions. Because monitoring programs require significant investments of time, money, and human resources to implement and maintain, periodic evaluations of monitoring programs are necessary to determine if the sampling design adequately addresses program goals and objectives. Periodic evaluations also permit assessment of a program's ability to provide adequate and useful information for changing management and science needs. We evaluated the Long Term Resource Monitoring Program's (LTRMP) fish sampling design by analyzing data from stratified random samples collected from 1993 to 1999 in six Trend Analysis Areas (TAAs). Specifically, we investigated whether the sampling design could provide similar information with fewer sampling gears. Our goals were to identify and quantify information provided by each gear used to monitor fish in the LTRMP, develop alternative sampling design scenarios based on our analyses and expert opinion, and engage program partners in a discussion on the relative value of each gear within the present sampling design. Community characterization (presence or absence), community structure (relative abundance within the full community), and detection of annual changes in single-species catch-per-unit-effort (Lubinski et al. 2001) are the primary information provided by the fish component. Our analyses considered differences in these measures among TAAs, gear types, sampling strata, seasonal sampling period, and fish size. Results were made available to program partners through a Web site for review and comment. Based on these analyses, program partners developed a suite of potential options for component refinement.
Shovelnose Sturgeon Age and Growth Characteristics and Fish Community Characteristics of the Lower Platte River and Missouri River Near Nebraska
.................................................................................................ii Acknowledgements....................................................................................iv List of Tables........................................................................................viii List of Figures..........................................................................................x Chapter 1 GENERAL INTRODUCTION ..................................................1 References....................................................................................3 Chapter 2 AGE AND GROWTH CHARACTERISTICS OF SHOVELNOSE STURGEON SCAPHIRHYNCHUS PLATORYNCHUS ON THE LOWER PLATTE RIVER IN EASTERN NEBRASKA.................................5 Introduction...................................................................................5 Methods.......................................................................................7 Study Area...........................................................................7 Fish Calcified Structure Collection...............................................8 Data Analysis......................................................................11 Results ........................................................................................11 Discussion...................................................................................13 References...................................................................................16 Chapter 3 COMMUNITY COMPOSITION OF THE LOWER PLATTE RIVERAND THE MISSOURI RIVER NEAR NEBRASKA .......................................................................................3
Patterns of fish and wildlife use for subsistence in Fort Yukon, Alaska
Fort Yukon, located along the Yukon River in northeastern interior Alaska, is the largest Athabaskan community in the state with an estimated population of 584 residents comprising 212 households in 1987. This study was undertaken to gather quantitative information on subsistence harvest and use of ftih and wildlife resources by Fort Yukon residents. These data, along with updated land use maps and socioeconomic information, were intended to complement a previous description of Fort Yukon subsistence activities published by the Division of Subsistence in 1983. Data collection took place from August 1987 through October 1988 using a household survey administered to a stratified sample of 72 (34 percent) of Fort Yukon households. Serving as the hub for administration and services in the Yukon Flats region and surrounding communities, 65 percent of the wage employment opportunities in Fort Yukon were in the federal, state, and local government sector. Jobs were predominantly seasonal or part-time in nature with only about 25 percent of jobs offering permanent, full-time employment. The median annual household income from all sources in 1987 was estimated to be $17,856. Among all households, the Alaska permanent fund dividend was the largest single source of non-wage income, averaging almost $1,529 per household. Among the estimated 43 trapping households, trapping was the largest source of nonwage income, contributing an average of $5,149 per trapping household. Fort Yukon residents displayed a high degree of involvement in the harvest, use, and sharing of fish and wildlife resources. All households used some wild resources during the survey year and an estimated 91.5 percent of all households made direct attempts at harvesting resources. Examining the use of major resource groups, mammals (excluding furbearers) were used by 100 percent of the households, salmon by 97.2 percent, birds by 90.4 percent, non-salmon fish by 89.2 percent, furbearers by 43.8 percent, and plants by 37.6 percent. The estimated total edible weight of resources harvested by Fort Yukon residents during the survey year was 625,725 pounds. This provided an average household harvest of 2,951 pounds and an average per capita harvest of 1,071 pounds. Almost two thirds (61 percent) of the total harvest consisted of salmon. Differences between the percentage of households harvesting and using specific resources point to patterns of resource sharing that remain an important aspect of contemporary subsistence production. Land use data showed that Fort Yukon residents utilized a large geographic area of the surrounding Yukon Flats to support subsistence activities. While some activities such as salmon fishing were found to be concentrated within 10 or 20 miles of Fort Yukon, the overall community use area encompassed a 150 mile stretch of the Yukon River and tributary streams between the communities of Beaver and Circle, as well as the Alaska portion of the Porcupine River drainage and its tributaries. Dogs continued to play an important role in supporting subsistence activities during the study year, especially as a mode of winter transportation for trappers. This study also found that more than one third of the total harvest, composed largely of chum salmon, was utilized as dog food. The per capita harvest of wild resources in Fort Yukon was estimated to be 679.0 pounds when resources fed to dogs were excluded. These data indicate that subsistence harvest and use of local resources for human consumption and as food for dogs was an integral part of the mixed economy of Fort Yukon during the study period.