Proceedings of a Workshop on Fish Habitat Suitability Index Models PDF Download
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Author: James W. Terrell
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 404
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Book Description
Author: James W. Terrell
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 404
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Book Description
Author: James W. Terrell
Publisher:
ISBN:
Category : Habitat (Ecology)
Languages : en
Pages : 393
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Author:
Publisher:
ISBN:
Category : Environmental impact analysis
Languages : en
Pages : 58
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Book Description
Author: Lawrence A. Lee
Publisher:
ISBN:
Category : Catfishes
Languages : en
Pages : 56
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Author: Ken Bovee
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 424
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Author: Kurt D. Fausch
Publisher:
ISBN:
Category : Fish communities
Languages : en
Pages : 60
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Book Description
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.
Author: Beatrice Van Horne
Publisher:
ISBN:
Category : Birds
Languages : en
Pages : 40
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1258
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Author: National Research Council Canada
Publisher: NRC Research Press
ISBN: 9780660149547
Category : Technology & Engineering
Languages : en
Pages : 276
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Book Description
Up-to-date information, knowledge and research in progress in scientific fields related to natural production of juvenile Atlantic salmon and some other ecologically similar fluvial salmonids is contained in the 25 papers and 12 abstracts contained in this publication, which were prepared for an international symposium held in St. John's, Newfoundland. Studies relate to stream ecology, invertebrates and predators, habitat improvement, competitive effects, behaviour and dispersal, habitat and production of juvenile salmon, population dynamics and relationships of juvenile salmon estimates to smolt yields. A list of participants at the conference is also provided.
