3,146 research outputs found
Rainwater Basin Wetland Management District Bird List
The Rainwater Basin of south central Nebraska has attracted millions of migratory birds each spring for generations. During migration, millions of snow geese, Canada geese, white-fronted geese, ducks, and 1/2-million sandhill cranes use the Rainwater Basin and the adjacent Platte River. The shallow wetland basins and surrounding croplands of the area provide the birds with critical resting and feeding sites during their migration north. The Waterfowl Production Areas (WPAs) of the Rainwater Basin Wetland Management District (WMD) are managed as grassland-playa lake ecosystems. The Rainwater Basin WMO staff currently manages 59 WPAs in the Rainwater Basin. Most of the WPAs must undergo extensive restoration to provide quality habitat for the millions of migrating birds. To restore wetlands, WMD staff employ a variety of management techniques such as pumping groundwater, prescribed burning, grazing, filling in pits, removing trees, and clearing non-native plants. These lands. once used for agricultural purposes, are now reseeded to recover the native plant communities. The species listed in this leaflet have all been observed in the WPAs. All species names are in accordance with the A.O.U. Check-list of North American Birds 7th edition, 1998. For clarity, some of the former names are shown in parentheses
Evaluation of the Effects of Stage Fluctuations on Overwinter Survial and Movement of Young Colorado Pikeminnow in the Green River, Utah, 1999-2002
Each component of the Flaming Gorge Winter study had specific objectives to address oncerning the effects of winter operations of Flaming Gorge Dam on the survival, distribution, and ursery habitats of age-O Colorado pileeminnow. n Table I, study objectives for each project are resented and the reader is directed to the relevant draft report. The Colorado River Fish Project-Vernal, tah, was responsible for conducting field investigations (i.e., population estimates, winter fish sampling, nd monitoring stage fluctuations) in the alluvial reach occupied by age-O Colorado pileeminnow. olorado State University was responsible for characterizing movement rates under simulated winter onditions; and developing and eValuating a bioenergetics model for age-O Colorado pileeminnow
[Letter from New England Regional Director to Division Engineer, New England Division, U.S. Army Corps of Engineers]
The results of appraisals conducted jointly by this Service, the Maine Department of Inland Fisheries and Wildlife, and your agency concerning bald eagle, osprey, peregrine falcon, and great blue heron
2011 National Survey of Fishing, Hunting, and Wildlife-Associated Recreation : Maine
https://digitalmaine.com/fws_feddocs/1000/thumbnail.jp
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Fish Passage Engineering Design Criteria
Anthropogenic activities in rivers may introduce undue hazards to many aquatic organisms and contribute to overall habitat fragmentation. Fragmentation may negatively alter the structure and diversity of both diadromous and resident fish populations. These adverse impacts can be mitigated through dam removal, and a variety of technical and nature-like fish passage and protection technologies. Fish passage and protection (hereafter simply “fish passage”) requires the integration of numerous scientific and engineering disciplines including fish behavior, ichthyomechanics, hydraulics, hydrology, geomorphology, and hydropower. This document is intended to: 1) establish Engineering’s “baseline” design criteria for fishways, dam removals, road crossings and other fish passage related technologies; 2) serve as a resource for training in these disciplines; and 3) support the implementation of the Service’s statutory authorities related to the conservation and protection of aquatic resources (e.g., Section 18 of the Federal Power Act, Endangered Species Act, Fish and Wildlife Coordination Act, and the Anadromous Fish Conservation Act)
A Preliminary Investigation of Nutrients and Isotopic Nitrogen in Oregon Chub Habitat Adjacent to Oakridge Sewage Treatment Plant : Final Report
21 pp. Bookmarks supplied by UO. References, tables, figures. Captured August 13, 2007.Reports on the results of a study on the effects of isotopic nitrogen on Oregon Chub in the Oakridge Slough of the Middle Fork Willamette River Drainage. Makes recommendations for addressing the problems identified
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Natural Reproductive Success and Demographic Effects of Hatchery-Origin Steelhead in Abernathy Creek, Washington : Annual Report 2008.
Many hatchery programs for steelhead pose genetic or ecological risks to natural populations because those programs release or outplant fish from non-native stocks. The goal of many steelhead programs has been to simply provide 'fishing opportunities' with little consideration given to conservation concerns. For example, the Washington Department of Fish and Wildlife (WDFW) has widely propagated and outplanted one stock of winter-run steelhead (Chambers Creek stock) and one stock of summer-run steelhead (Skamania stock) throughout western Washington. Biologists and managers now recognize potential negative effects can occur when non-native hatchery fish interact biologically with native populations. Not only do non-native stocks pose genetic and ecological risks to naturally spawning populations, but non-native fish stray as returning adults at a much higher rate than do native fish (Quinn 1993). Biologists and managers also recognize the need to (a) maintain the genetic resources associated with naturally spawning populations and (b) restore or recover natural populations wherever possible. As a consequence, the U.S. Fish & Wildlife Service (USFWS) and the NOAA Fisheries have been recommending a general policy that discourages the use of non-native hatchery stocks and encourages development of native broodstocks. There are two primary motivations for these recommendations: (1) reduce or minimize potential negative biological effects resulting from genetic or ecological interactions between hatchery-origin and native-origin fish and (2) use native broodstocks as genetic repositories to potentially assist with recovery of naturally spawning populations. A major motivation for the captive-rearing work described in this report resulted from NOAA's 1998 Biological Opinion on Artificial Propagation in the Columbia River Basin. In that biological opinion (BO), NOAA concluded that non-native hatchery stocks of steelhead jeopardize the continued existence of U.S. Endangered Species Act (ESA)-listed, naturally spawning populations in the Columbia River Basin. As a consequence of that BO, NOAA recommended - as a reasonable and prudent alternative (RPA) - that federal and state agencies phase out non-native broodstocks of steelhead and replace them with native broodstocks. However, NOAA provided no guidance on how to achieve that RPA. The development of native broodstocks of hatchery steelhead can potentially pose unacceptable biological risks to naturally spawning populations, particularly those that are already listed as threatened or endangered under the ESA. The traditional method of initiating new hatchery broodstocks of anadromous salmonid fishes is by trapping adults during their upstream, spawning migration. However, removing natural-origin adults from ESA listed populations may not be biologically acceptable because such activities may further depress those populations via 'broodstock mining'. In addition, trapping adult steelhead may be logistically unfeasible in many subbasins due to high water flows in the spring, when steelhead are moving upstream to spawn, that will often 'blow out' temporary weirs. Additional risks associated with trapping adults include genetic founder effects and difficulties meeting minimum, genetic effective number of breeders without 'mining' the wild population to potential extinction. As a result, alternative methods for developing native broodstocks are highly desired. One alternative for developing native broodstocks, particularly when the collection of adults is logistically unfeasible or biologically unacceptable, is captive rearing of natural-origin juveniles to sexual maturity. In this approach, pre-smolt juveniles are collected from the stream or watershed for which a native broodstock is desired, and those juveniles are raised to sexual maturity in a hatchery. Those hatchery-reared adults then become the broodstock source for gametes and initial progeny releases. Such a captive rearing program offers many genetic advantages over traditional adult-trapping programs for developing native broodstocks: (1) Large numbers of juveniles can be collected from the wild with only minimal impacts to naturally spawning populations because juvenile (age 0+parr)-to-adult survivals are typically very small (<1%) under natural conditions. (2) The genetic base of the broodstock (i.e. genetic effective population size) can be substantially larger for juveniles than adults because juveniles can theoretically represent the offspring of all adults that spawned successfully within a stream or watershed, as opposed to trapping only a small portion of returning adults for broodstock. (3) Collecting juveniles for broodstock can substantially reduce the risk of genetically 'swamping' naturally spawning populations with hatchery-origin fish (i.e. via a 'Ryman-Laikre effect') as occurs when hatchery-released fish represent the progeny of a relatively small number of trapped adults
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Habitat Evaluation Procedure Report For Proposed Kaniksu Unit Of The Little Pend Oreille National Wildlife Refuge
Little Pend Oreille National Wildlife Refuge is proposing to acquire a 706-acre property located in Stevens County, Washington. The new acquisition would be called the Kaniksu Unit. A habitat evaluation was conducted on the property using the Habitat Evaluation Procedures (HEP) methodology (U.S. Fish and Wildlife Service 1980). Evaluation species were black-capped chickadee, mallard, ruffed grouse and white-tailed deer. Life requisites evaluated were food and reproduction for black-capped chickadee, food, cover, and reproduction for mallard, available winter browse for white-tailed deer and fall-to-spring cover for ruffed grouse
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