Download or read book Geomorphic and Aquatic Conditions Influencing Salmonids and Stream Classification written by William S. Platts and published by . This book was released on 1974 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sport Fishery Abstracts written by and published by . This book was released on 1976 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development of an Aquatic Habitat Classification System for Lakes written by W.D.N. Busch and published by CRC Press. This book was released on 2018-01-18 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of freshwater fisheries changing their strategies from the regulation of harvest and the enhancement of populations, to the creation and protection of habitats and the management of ecosystems, moves toward establishing an aquatic habitat classification system. Eight papers, from the February 1988 Symposium on the Classification and Inventory of Great Lakes Aquatic Habitats (the last in a series of Great Lakes Symposia), propose various classification approaches, most using a limited number of physical, chemical, and/or biological variables to produce some form of index. They also include overviews and summaries of the classification process.
Download or read book Methods for Evaluating Stream Riparian and Biotic Conditions written by William S. Platts and published by . This book was released on 1982 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acquisition and Utilization of Aquatic Habitat Inventory Information written by Neil B. Armantrout and published by . This book was released on 1982 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Sediment on the Aquatic Environment written by Janine Castro and published by . This book was released on 1995 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Sheep Grazing on a Riparian stream Environment written by William S. Platts and published by . This book was released on 1981 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Technical Report INT written by and published by . This book was released on 1980 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Note INT written by and published by . This book was released on 1981 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertilizing and Clipping Effects on Seed Capsule and Forage Production of Orange Globemallow written by Clayton R. Gautier and published by . This book was released on 1979 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of a Stream Channel type System for Southeast Alaska written by Mason D. Bryant and published by . This book was released on 1991 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Models that Predict Standing Crop of Stream Fish from Habitat Variables written by Kurt D. Fausch and published by . This book was released on 1988 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: We reviewed mathematical models that predict standing crop of stream fish (number or biomass per unit area or length of stream) from measurable habitat variables and classified them by the types of independent habitat variables found significant, by mathematical structure, and by model quality. Habitat variables were of three types and were measured on different scales in relation to stream channels: variables of drainage basins were measured on the coarsest scale from topographic maps; channel-morphometry and flow variables were measured in the field along transects perpendicular to flow; and habitat-structure, biological, physical, and chemical variables were measured on the finest scale in the field. We grouped the 99 reviewed models by the types of independent variables found significant during model development: (A) primarily drainage basin (5 models), (8) primarily channel morphometry and flow (16 models), (C) primarily habitat structure, biological, physical, and chemical (25 models), (D) a combination of several types of variables (39 models), and (E) tests of weighted usable area as a habitat model (14 models. Most models were linear or multiple linear regressions, or correlations, but a few were curvilinear functions (exponential or power). Some used multivariate techniques (principal components or factor analysis), and some combined independent variables into one or more indices. We judged model quality based on simple criteria of precision and generality: coefficient of determination, sample size, and degrees of freedom. Most models were based on data sets of fewer than 20 observations and, thus, also had fewer than 20 degrees of freedom. Most models with coefficients of determination of greater than 0.75 had fewer than 20 degrees of freedom, which led us to conclude that relatively precise models often lacked generality. We found that sound statistical procedures were often overlooked or were minimized during development of many models. Frequent problems were too small a sample size, possible bias caused by error in measuring habitat variables, using poor methods for choosing the best model, not testing models, using models based on observational data to predict standing crop, and making unrealistic assumptions about capture probabilities when estimating standing crop. The major biological assumptionthat the fish population was limited by habitat rather than fishing mortality, interspecific competition, or predationusually was not addressed. We found five main ways stream-fish-habitat models are used in fishery management. To be useful for analyzing land management alternatives, models must include variables affected by management and be specific for a homogeneous area of land.
Download or read book General Technical Report RM written by and published by . This book was released on 1978 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Riparian Ecosystems and Their Management written by and published by . This book was released on 1985 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report No FHWA RD written by United States. Federal Highway Administration. Offices of Research and Development and published by . This book was released on 1976 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Methods and Statistical Analyses for Monitoring Small Salmonid Streams written by Carl L. Armour and published by . This book was released on 1984 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
