EBTJV

Population regulation of brook trout (Salvelinus fontinalis) in Hunt Creek, Michigan: a 50-year study: 1. Fisheries models generally are based on the concept that strong density dependence exists in fish populations. Nonetheless, there are few examples of long-term density dependence in fish populations. 2. Using an information theoretical approach (AIC) with regression analyses, we examined the explanatory power of density dependence, flow and water temperature on the per capita rate of change and growth (annual mean total length) for the whole population, adults, 1+ and young-of-the-year (YOY) brook trout (Salvelinus fontinalis) in Hunt Creek, Michigan, USA, between 1951 and 2001. This time series represents one of the longest quantitative population data sets for fishes. 3. Our analysis included four data sets: (i) Pooled (1951–2001), (ii) Fished (1951–65), (iii) Unfished (1966–2001) and (iv) Temperature (1982–2001). 4. Principle component analyses of winter flow data identified a gradient between years with high mean daily winter flows, high daily maximum and minimum flows and frequent high flow events, and years with an opposite set of flow characteristics. Flows were lower during the Fished Period than during the Unfished Period. Winter temperature analyses elucidated a gradient between warm mean, warm minimum and maximum daily stream temperatures and a high number of minimum daily temperatures >6.1 C, and years with the opposite characteristics. Summer temperature analyses contrasted years with warm summer stream temperatures vs years with cool summer stream temperatures. 5. Both YOY and adult densities varied several-fold during the study. Regression analysis did not detect a significant linear or nonlinear stock–recruitment relationship. AIC analysis indicated that density dependence was present in 15 of 16 cases (four population segments · four data sets) for both per capita rate of increase (wi values 0.46–1.00) and growth data (wi values 0.28–0.99). The almost ubiquitous presence of density dependence in both population and growth data is concordant with results from other trout populations and other studies in Michigan.
Located in Science and Data / Brook Trout Related Publications
A Function-Based Framework for Stream Assessment & Restoration Projects: Stream restoration efforts have increased significantly in the US over the past few decades and are now recognized as a billion-dollar industry. These restoration efforts stem from centuries of abuse as humans continue to alter the riverine landscape for a variety of purposes, including farming, logging, mining and development on the floodplain, and the subsequent need for channelization and flood control. These activities have significantly diminished the natural functions of our stream corridors. Today stream corridor restoration efforts seek to improve or restore these lost functions. A variety of federal, state and local programs, along with efforts from non-profit organizations, provide funding for these programs. The goals are varied and range from simple streambank stabilization projects to watershed scale restoration. For these projects to be successful it is important to know why the project is being completed and what techniques are best suited to restore the lost functions. Knowing why a project is needed requires some form of functional assessment followed by clear project goals. To successfully restore stream functions, it is necessary to understand how these different functions work together and which restoration techniques influence a given function. It is also imperative to understand that stream functions are interrelated and build on each other in a specific order, a functional hierarchy. If this hierarchy is understood, it is easier to establish project goals. And with clearer goals, it is easier to evaluate project success.
Located in Science and Data / Brook Trout Related Publications / Stream Assessment and Monitoring
Sampling strategies for estimating brook trout effective population size - Whitely et al. 2012: This research examined the influence of sampling strategy on estimates of effective population size.
Located in Science and Data / Brook Trout Related Publications / Chesapeake Bay Brook Trout Management Strategy-References
Patch-Based Metrics: A Cost Effective Method for Short- and Long-Term Monitoring of EBTJV Wild Brook Trout Populations? - Whiteley et al. 2012: This document describes a methodology for monitoring Brook Trout population trends.
Located in Science and Data / Brook Trout Related Publications / Chesapeake Bay Brook Trout Management Strategy-References
Midwest FHP Fish Habitat Modeling Results: Ohio River Basin and SARP: This report describes the results of modeling performed by Downstream Strategies.
Located in Science and Data / Brook Trout Related Publications / Chesapeake Bay Brook Trout Management Strategy-References
GTMNERR Community Oyster Shell Recycling and Living Reef Construction Project: This project established an oyster shell recycling program for St. Johns County, Florida, constructed a living shoreline, and planted spartina grass within the boundaries of the new reef to further protect the shoreline and provide nursery habitat for marine species at the Guana Tolomato Matanzas National Estuarine Research Reserve.
Located in Funded Projects / SARP Projects W2B
Stream Bank & Riparian Restoration along the Wild and Scenic Cossatot River on the Ouachita NF: Six riparian sites have severe erosion from loss of riparian vegetation and heavy recreational use. Riparian habitat function will be restored by stabilizing stream banks and planting vegetation. Stream habitat cover will increase with addition of materials to repair stream banks. Campsites will be designated and hardened. To measure effectiveness, water samples taken every 3 months over the past 4 years will continue for at least the next 4 years by the Cossatot River Watch Stream Team to compare pre- and post-restoration.
Located in Funded Projects / SARP Projects W2B
Restoration of a backwater of the Arkansas River, Rector Chute: The Rector Chute backwater will be restored to prevent conversion of aquatic habitat to terrestrial habitat through sedimentation. Select areas will be dredged with a Mudcat hydraulic dredge.
Located in Funded Projects / SARP Projects W2B
Chipola River Watershed Restoration Listed Mussels and Black Bass Initiative: The Chipola River Watershed (HUC # 03130012) is located in northwest Florida/southeast Alabama and includes parts of Jackson, Calhoun, Gulf, Washington and Bay Counties in Florida and Geneva and Houston Counties in Alabama. Some of the smaller tributaries that encompass the Chipola River watershed include: Chipola River Dead Lakes, Spring Creek, Muddy Branch and Otter Creek (subunit 020, 050). The Chipola River Watershed traverses over 100 miles through 812,800 acres with 200,000 acres being utilized in crop production, which is vital to the economy of the region and is the primary socio-economic resource. The Chipola River is defined by Northwest Florida Water Management District as a major Florida river. It originates from freshwater springs in the upper watershed and accounts for approximately 20% of the waters to the Apalachicola River, which is the largest river in Florida. High base flow in Chipola River is supported by over 63 known Floridan aquifer springs. The Chipola River is defined by Florida Department of Environmental Protection as an “Outstanding Florida Waterbody”. However, threats have been identified that could degrade water quality, reduce habitat, or negatively impact rare or imperiled species within the Chipola River watershed. In the past three decades, nitrate concentrations in spring waters have increased substantially in northern and central Florida. Jackson Blue, a tributary to the Chipola and first magnitude spring has the second highest concentration of nitrates of any spring in Florida. The Chipola River and its subunits Dead Lakes (WBID 51B), Muddy Branch (WBID 175) and Otter Creek are 303(d) listed due to agricultural non-point source pollution within the watershed area (EPD 305b report). A great diversity of habitats exist within the watershed from xeric upland longleaf pine forests, to bottomland hardwood swamps, freshwater wetlands, numerous natural springs, and meandering creeks with multiple tributaries. These habitats support rich animal communities with several hundred species of fish and wildlife. There are six federally threatened and endangered mussels species that occur within the Chipola River i.e., oval pigtoe, fat three-ridge, Chipola slabshell, Gulf moccasinshell, purple bankclimber, and shinyrayed pocketbook. The Chipola River is also a managed resource for striped bass and the unique shoal bass fishery. Other threatened and endangered species include: Amphibians & reptiles- American alligator, eastern indigo snake and flatwoods salamander; Fish; Gulf sturgeon; Birds; Arctic peregrine falcon, southeastern kestrel, bald eagle, wood stork, red-cockaded woodpecker; Mammals: i.e. Indiana bat and gray bat. Chipola plants listed on the state or federal endangered list include Marianna columbine, sicklepod, and Apalachicola wild indigo. Endangered and threatened species under serious threat from habitat loss, degradation and fragmentation have been documented and a watershed based plan of action should be developed and initiated for their recovery. A Chipola River watershed partnership between the U.S. Fish and Wildlife Service (Service) and Florida Fish and Wildlife Conservation Commission (FWC) have been initiated since 2006. The purpose was to develop and lead a research-based platform for environmental restoration and conservation. The Service, along with FWC, West Florida RC&D; Council and others developed a Chipola River Watershed Management Plan (CRWMP) to achieve management and conservation of fish and wildlife resources. This proposal is for the next steps toward management activities under the CRWMP.
Located in Funded Projects / SARP Projects W2B
Restoration of Essential Habitats for Juvenile Tarpoon and Snook: Habitat loss and degradation are major threats to coastal fisheries, especially alterations of freshwater flow into estuarine habitats. This project will restore natural topography and hydrology to 229 acres of coastal land that includes juvenile habitat for economically and recreationally important tarpon and snook. Monitoring of water quality and fishes within mangrove creeks will quantify the changes resulting from restoration. An established education program will be used to disseminate project results to the public, and the project site will be protected and managed as a public park and nature preserve in perpetuity. This project is currently on-going.
Located in Funded Projects / SARP Projects W2B

« Previous 10 items Next 10 items » 1 [2] 3 4 5

Sections

Personal tools

Search results