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Autor |
Wang, Y.; Mervyn, R. T.; Somers, I. F. |
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Titel |
A maximum likelihood approach for estimating growth from tag-recapture data |
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Zeitschrift, Artikel |
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Jahr |
1995 |
Publikation |
Can. J. Fish. Aquat. Sci |
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52 |
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252-259 |
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Schlüsselwörter |
maximum-likeli, modell, capt-recapt, wachstum |
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Zusammenfassung |
The Fabens method is commonly used to estimate growth parameters k and l in the von Bertalanffy model from tag-recapture data. However, the Fabens method of estimation has an inherent bias when individual growht is variable. This paper present an asymptotocally unbiasses method using the maximum-likelihood approach that takes account of individual varibility in both maimum lenth and age-at-tagging. ... |
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Rufnummer |
463 |
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2264 |
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Autor |
Angermeier, P. L.; Smogor, R. A. |
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Titel |
Estimating number of species and relative abundances in stream-fish communities: Effects of sampling effort and discontinuous spatial distributions |
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Zeitschrift, Artikel |
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Jahr |
1995 |
Publikation |
Can. J. Fish. Aquat. Sci. J. Can. Sci. Halieut. Aquat |
Kurztitel der Zeitschrift |
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Band |
52 |
Ausgabe |
5 |
Seiten |
936-949 |
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Schlüsselwörter |
Fisch, Fließgewässer, Habitat, Verbreitung |
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Zusammenfassung |
The authors sampled fishes and measured microhabitat in series of contiguous habitat units (riffles, runs, pools) in three Virginia streams. Monte Carlo simulations were used to construct hypothetical series of habitat units, then examined how number of species, similarity in relative abundances, and number of microhabitats accumulated with increasing number of habitat units (i.e., sampling effort). The curves indicated that 90% of the species present were usually found by sampling 5 to 14 habitat units (stream length of 22-67 stream widths). Estimates of species relative abundances required less sampling effort for a given accuracy than estimates of number of species. Rates of species accumulation (with effort) varied among streams and reflected discontinuity in species distributions among habitat units. Most discontinuity seemed to be due to low population density rather than to habitat selectivity. Results from an Illinois stream corroborated our findings from Virginia, and suggested that greater sampling effort is needed to characterize fish community structure in more homogeneous stream reaches. |
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Natl. Biol. Serv., Virginia Coop. Fish Wildl. Res. Unit, Virginia Polytech. Inst., Blacksburg, VA 24061-0321, USA |
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nein |
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Rufnummer |
620 |
Signatur |
2414 |
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Autor |
Steinmann, Paul |
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Titel |
Frühreife und Zwergwuchs bei Salmoniden |
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Jahr |
1945 |
Publikation |
Rev. Suisse Zool. |
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52 |
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414-415 |
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Schlüsselwörter |
Fisch, Seesaibling, Salvelinus alpinus, Wachstum |
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nein |
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2577 |
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Autor |
Gassner, H.; Riedlsperger, R.; Patzner, R. A.; Jagsch, A. |
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Titel |
Das Wachstum der Renken Coregonus lavaretus L. des Irrsees und des Zellersees |
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Zeitschrift, Artikel |
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Jahr |
1998 |
Publikation |
Österreichs Fischerei |
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Band |
51 |
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Seiten |
14-19 |
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Schlüsselwörter |
Fisch, Felchen, Maräne, Coregonus |
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nein |
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Rufnummer |
169 |
Signatur |
482 |
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Autor |
Kainz, E.; Gollmann, H.-P. |
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Titel |
Aufzuchtversuche beim Strömer (Leuciscus souffia agassizi Rossi) |
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Zeitschrift, Artikel |
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Jahr |
1998 |
Publikation |
Österreichs Fischerei |
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Band |
51 |
Ausgabe |
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Seiten |
19-22 |
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Schlüsselwörter |
Fisch, Leuciscus, Fortpflanzung, Ontogenie, Biologie |
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nein |
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Rufnummer |
7 |
Signatur |
1921 |
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Weissenbacher, A.; Spolwind, R.; Weidbacher, H. |
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Titel |
Hohe Populationsdichten der Kesslergrundel (Neogobius kessleri, Günther 1861) in der österreichischen Donau, östlich von Wien |
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Zeitschrift, Artikel |
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Jahr |
1998 |
Publikation |
Österreichs Fischerei |
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51 |
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268-273 |
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Schlüsselwörter |
Fisch, Vorkommen, Neogobius, Verbreitung |
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nein |
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Rufnummer |
102 |
Signatur |
2002 |
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Autor |
Labelle, M. |
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Titel |
A likelihood method for estimating Pacific salmon escapement based on fence counts and mark-recapture data |
Typ |
Zeitschrift, Artikel |
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Jahr |
1994 |
Publikation |
Can. J. Fish. Aquat. Sci. |
Kurztitel der Zeitschrift |
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Band |
51 |
Ausgabe |
3 |
Seiten |
552-566 |
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Schlüsselwörter |
capt-recapt, methode, ML, modell, statistik, simulation |
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Zusammenfassung |
Pacific salmon (Oncorhynchus spp.) escapements in natural streams are often determined by conducting fence counts in conjunction with mark-recapture operations. Typical field conditions are characterized by protracted floods, undetected immigration, variation in sampling rates, mortality during the census periods, small sample sizes, and few successive recaptures. Closed population models tend to overestimate escapement under such conditions, and traditional open population models cannot always be relied on due to the lack of sufficient data. A likelihood-based estimation method was specifically designed for such conditions. A distinguishing feature of this model is that individual recapture histories are not required for parameter estimation. The model is also structured to incorporate ancillary data in the estimation process to improve the precision and accuracy of the estimates. The model is described in detail, and suggestions are made to facilitate its application. |
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nein |
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Rufnummer |
468 |
Signatur |
2269 |
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Autor |
McGarvey, R. |
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Titel |
An age-structured open-access fishery model |
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Zeitschrift, Artikel |
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Jahr |
1994 |
Publikation |
Can. J. Fish. Aquat. Sci. |
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Band |
51 |
Ausgabe |
4 |
Seiten |
900-912 |
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Schlüsselwörter |
modell, statistik, population, dynamik, algorithmus |
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Zusammenfassung |
A dynamic model for open-access fisheries is presented. In addition to density dependence in recruitment and fishing effort changing in proportion to the level of profit fishermen earn which characterizes previous open-access models, it incorporates full age structure for the fish stock, lognormal environmental recruitment variability, and gear selectivity. The predator-prey cycling solution of the original Schaefer dynamic model, and subsequent open-access models, persists for these model extensions. Density dependence in recruitment induces greater global stability. Environmental recruitment variability, common in marine populations, is destabilizing in the neighborhood of the open-access equilibrium. Approximating model steady states of effort and catch by the corresponding averages from data time series underlies a new algorithm of parameter evaluation, applied here to an open-access model of the Georges Bank sea scallop (Placopecten magellanicus) fishery. |
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nein |
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Rufnummer |
469 |
Signatur |
2270 |
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Conway, G. R.; Glass, N. R.; Wilcox, J. C. |
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Titel |
Fitting Nonlinear Models to Biological Data by Marquardt´s Algorithm |
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Jahr |
1970 |
Publikation |
Ecology |
Kurztitel der Zeitschrift |
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Band |
51 |
Ausgabe |
3 |
Seiten |
503-507 |
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Schlüsselwörter |
marquardt, statistik, methode, nichtlinear, algorithmus |
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Zusammenfassung |
Equations describing biological phenomena frequently have parameters entering nonlinearly. A highly efficient method for detemining the values of parameters in such equations that will give the best least-squares fit to a set of data is Marquardt´s algorithm. A step-by-step derivation of the algorithm is given in terms that require only the knowledge of elementary calculus and matrix algebra. As an example, the method is used to fit the logistic equation to a set of data. |
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nein |
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Rufnummer |
471 |
Signatur |
2272 |
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Autor |
Kenchington, E. L.; Full, W. E. |
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Titel |
Fourier analysis of sea scallop (Placopecten magellanicus) shell in determining population structure |
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Zeitschrift, Artikel |
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Jahr |
1994 |
Publikation |
Can. J. Fish. Aquat. Sci. |
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51 |
Ausgabe |
2 |
Seiten |
348-356 |
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Schlüsselwörter |
population, fourier, statistik, methode, modell, wachstum, muscheln |
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Zusammenfassung |
Sea scallops (Placopecten magellanicus) were sampled from each of four scallop beds: the northeast peak of Georges Bank, Western Bank, St. Pierre Bank, and the Bay of Fundy near Digby, N.S. The outlines of scallop top shells were captured by video imagery using a semiautomated approach. Fourier shape descriptors were calculated and analyzed. Age and year-class effects were shown to be important factors influencing scallop shell shape. Allometric effects on Fourier harmonics also have a significant influence on shell shape in this species. Comparisons of Fourier harmonics between scallop beds separated by age and sampling year, and corrected for allometry, revealed significant differences in the majority of harmonic numbers. |
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Rufnummer |
472 |
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2273 |
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