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Verweise |
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Autor |
Carus, C. G. |
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Titel |
Neue Untersuchungen über die Entwicklungsgeschichte unserer Flußmuscheln |
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1832 |
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87 |
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Schlüsselwörter |
Muschel, Entwicklungsgeschichte |
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Leipzig |
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307 |
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Autor |
Chen, Y.; Jackson, D. A. |
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Titel |
Robust estimation of mean and variance in fisheries |
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Zeitschrift, Artikel |
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Jahr |
1995 |
Publikation |
Trans. Am. Fish. Soc |
Kurztitel der Zeitschrift |
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Band |
124 |
Ausgabe |
3 |
Seiten |
401-412 |
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Schlüsselwörter |
fishery-statistics; population-characteristics; statistical-analysis |
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Zusammenfassung |
Many fisheries data are commonly summarized by two statistics: mean and variance (or standard deviation). Because observed values are subject to various errors, which often are large and heterogeneous in fisheries studies, outliers commonly exist in the data. The existence of outliers biases estimation of the mean and variance if traditional estimation methods are used. Instead of assuming that errors in fisheries data follow a normal distribution with a constant variance, we propose that errors associated with observations for a variable may encompass a mixture of different levels of normally distributed errors. Based on concepts from a robust regression method, least median of squares, that is not sensitive to atypical observations in data, we develop a simple algorithm to estimate mean and standard deviation. We compare the proposed robust estimation approach with traditional methods and Tukey's biweight robust approach using simulated and field data. Based on simulations, we found little difference in estimated means and variances between the proposed and traditional methods when there were no outliers defined in simulated data. However, when outliers were defined in simulated data, the errors in estimation of the mean and its standard deviation were much smaller with the proposed method than were those estimated with traditional methods. Means and standard deviations estimated with the proposed method changed little, regardless of whether or not the simulated data were contaminated by atypical values. The proposed approach tended to have smaller estimation errors than did the robust biweight method. We demonstrate how the significance and interpretation of fisheries and ecological relationships may be adversely affected when outliers are present. We suggest using our proposed robust method to identify and down-weight outliers in estimating a mean and its standard deviation. One should justify deletion of the identified outliers using the knowledge about fish biology and environmental conditions independent of the variable assessed. |
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308 |
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Autor |
Chovanec, A.; Fink, M. H.; Gruber, D.; Jagsch, A.; Nagy, M.; Weber, K.; Wimmer, R. |
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Titel |
Die stehenden Gewässer Österreichs: Erhebung und abiotische Charakterisierung |
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Zeitschrift, Artikel |
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Jahr |
2002 |
Publikation |
Österreichs Fischerei |
Kurztitel der Zeitschrift |
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55 |
Ausgabe |
8/9 |
Seiten |
197-207 |
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Schlüsselwörter |
Gewässer, Ökoregion, Österreich, abiotisch |
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309 |
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Autor |
Claes, M. |
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Titel |
Untersuchungen zur Entwicklungsbiologie der Teichmuschel Anodonta cygnea |
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Jahr |
1987 |
Publikation |
Zoologisches Institut |
Kurztitel der Zeitschrift |
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Schlüsselwörter |
Muschel, Entwicklung, Anodonta |
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Tierärztliche Hochschule |
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Hannover |
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310 |
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Autor |
Claus, W.; Kinzelbach, R. |
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Titel |
Die Höheren Krebse des Naturschutzgebietes “Hördter Rheinaue” (Crustacea: Malacostraca) |
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Zeitschrift, Artikel |
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Jahr |
1976 |
Publikation |
Mitt. Pollichia |
Kurztitel der Zeitschrift |
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Band |
64 |
Ausgabe |
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Seiten |
129-137 |
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Schlüsselwörter |
Krebs, Vorkommen, Verbreitung |
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311 |
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Autor |
Clay, D. |
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Titel |
TUNE: A series of fish stock assessment computer programs written in FORTRAN for microcomputers (MS DOS) |
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Zeitschrift, Artikel |
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Jahr |
1990 |
Publikation |
Collect. Vol. Sci. Pap. Iccat Recl. Doc. Sci. Cicta Colecc. Doc. Cient. Cicaa |
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32 |
Ausgabe |
2 |
Seiten |
443-460 |
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Schlüsselwörter |
computer-programmes; system-analysis; ICCAT- |
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Zusammenfassung |
This set of computer programs for stock assessment uses MS FORTRAN 77 version 4.1* for all the programs. The programs will compile under version 3.2 of MS FORTRAN 77, however the Open statements with file types “Unknown” must be changed to “New” or “Old” depending on the expected status of the file. The “shell” called TUNE is used to build the appropriate batch file for submission of the multiple runs used for calibration. Each of these programs is an interactive stand alone module, each can be used independently of the others. This report gives an outline of how and where these programs fit into an analytical process. A set of disks with the source code and the executable (*.EXE) files is available from the editor or the programs can be copied from the ICCAT Secretariat in Madrid; an Annex to this report containing a listing of the source code is also available. A glossary of terms commonly used in the assessment process is presented in Appendix I. |
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312 |
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Cole, R.; Ward, F.; Ward, T.; Deitner, R.; Fiore, J. |
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Titel |
Model for optimization of socio-economic fishery values on the Rio Grande in New Mexico |
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1987 |
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258 |
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Schlüsselwörter |
economic-models; sport-fishing; fishery-economics; USA,-New-Mexico,-Grande-R.-basin |
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Zusammenfassung |
A mathematical model which simulates sport-fish production yield and economic value in the Rio Grande basin of New Mexico is described. The model links hydrologic, biologic, and economic components into a mathematical representation of fisheries habitat, fishery dynamics, economic benefits, and income generated by sport-fishing in New Mexico. The model has a research version programmed in FORTRAN. The model users can modify water volume flowing through the basin by month, water stored in each reservoir, water discharged through connecting water material concentrations (suspended solids, total phosphorus, total nitrogen) in the water, site access, and site quality. (Prepared in cooperation with New Mexico State Univ., Las Cruces. Dept. of Fishery and Wildlife Sciences. Sponsored by Geological Survey, Reston, VA (USA). Water Resources Div.) |
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New Mexico Water Resources Research Inst., Las Cruces (USA) |
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313 |
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Autor |
Conrad, V. |
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Titel |
Versuche zur Wiedereinbürgerung der Meerforelle in Rheinland-Pfalz |
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Zeitschrift, Artikel |
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1991 |
Publikation |
Fischökologie Aktuell |
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4 |
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11-13 |
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Fisch, Meerforelle, Wiedereinbürgerung, Salmo trutta |
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314 |
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Coppola, S. R.; Fischer, W.; Garibaldi, L.; Scialabba, N.; Carpenter, K. E. |
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Titel |
Global species database for fishery purposes. User's manual |
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1994 |
Publikation |
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Kurztitel der Zeitschrift |
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fishery-data; data-collections; fishery-resources; commercial-species; information-retrieval; manuals-; FAO-; books-, Speciesdab- |
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Zusammenfassung |
The SPECIESDAB manual describes the use of software created to assist in the retrieval of information relevant to species of interest to fisheries. Data on scientific and vernacular nomenclature, biology, fishing gears, and geographical distribution are included for species that belong to certain marine resource groups. This information is derived from the FAO Fisheries Department species identification and data programme publications and the software is designed to permit continual updating as new publications on other resource groups appear. To date, some 25 major resource groups are covered. Among these are shrimps, lobsters, cephalopods, sharks, marine turtles, and 20 families of bony fishes, which together form a significant component of world fisheries. The program uses a menu system to provide users easy access to the information contained in SPECIESDAB. The manual includes extensive examples of how to use the software. On-line help is also available. Extensive query and reporting capabilities are provided to access data on valid scientific names, synonyms, national and local names, official FAO trilingual names, size, habitat, behaviour, kinds of gear utilized in the fishery, and level of interest to fisheries. Geographical information may be obtained by species, by country, or by fishing area. Data may be extracted for either a single resource group or for all resource groups in combination. Furthermore, the user interested in using only the data of species occurring in a particular geographical area can create, with the Regional option, a sub-database including only the species found in the countries selected. This option can be useful for regional bodies and working groups. SPECIESDAB includes a bibliographic reference system, which may be updated by the user as well as utilities for exporting data. |
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Zu bestellen |
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316 |
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Autor |
Criddle, K. R. |
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Titel |
Modelling dynamic fish populations |
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1991 |
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82 |
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Schlüsselwörter |
fishery-biology; commercial-species; Limanda-aspera; Hippoglossus-stenolepis; Paralithodes-camtschatica; Theragra-chalcogramma; Gadus-macrocephalus; mathematical-models; biomass-; INE,-USA,-Alaska |
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Zusammenfassung |
A recently introduced multivariate state-space time-series modeling algorithm, system-theoretic time-series, can be used to create a particularly robust state-space representation. Combining the model approximation methodology with time-series modeling of the residuals in accurate models of short-run dynamics. The approximate structural modeling methodology is illustrated with single species models of yellowfin sole (Limanda aspera ) biomass, and multispecies models of Pacific halibut (Hippoglossus stenolepis ), yellowfin sole, and red king crab (Paralithodes camtschatica ) biomasses in the eastern Bering Sea. A final application of the approximate structural/system-theoretic time-series model includes walleye pollock (Theragra chalcogramma ), Pacific halibut, Pacific cod (Gadus macrocephalus ), yellowfin sole, and red king crab. (Prepared in cooperation with Alaska Univ., Fairbanks.) |
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National Marine Fisheries Serv. |
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Seattle, WA (USA) |
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