France, R., Holmes, J., & Lynch, A. (1991). Use of size-frequency data to estimate the age composition of crayfish populations (Vol. 48).
Zusammenfassung: Age-classes in crayfish populations can be determined from size-frequency data provided 4 tents are adhered to only crayfish collected from areas of rock substrate are used; trapping are excluded; species do not have longevities exceeding about 4 yr; and most importantly, sample sizes are greater than about 200. Studies that have failed to follow these guidelines have met with limited success in dissecting mixed frequency distributions. Further, 3 validation procedures must be undertaken: temporal replication within molting events to measure the precision of both data collection and size-frequency analysis; corroboration with known-age crayfish from either field recaptures or laboratory molt increments; and concordance with independent analysis of the mean size at onset of sexual maturity. When these checks support the size-frequency results, population age composition and analyses of rates of growth or mortality can be considered reliable.
Schlüsselwörter: Krebs, lÄngenfrequenz, methode, statistik, population
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(1991). ObjectWindows für C++.
Schlüsselwörter: Dokumentation, tips
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Murphy, B. R., Willis, D. W., & Springer, T. A. (1991). The Relative Weight Index in Fisheries Management: Status and Needs (Vol. 16).
Schlüsselwörter: Fischerei, statistik, wachstum, modell
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Stal, M. (1991). Systeminterna nach INI-Art.
Schlüsselwörter: Windows, tips
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Nunney, L. (1991). The influence of age structure and fecundity on effective population size (Vol. 1991).
Schlüsselwörter: Population, Biologie, Theorie, Poisson
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Deller, K. (1991). Die Rolle der Bachforelle (Salmo trutta forma fario L.) als Konsument des Makrozoobenthos in einem Mittelgebirgsbach (Steina/Südschwarzwald). Diploma thesis, Universität, Konstanz.
Schlüsselwörter: Fisch, Bachforelle, Salmo trutta fario, Nahrung, Wachstum, Fließgewässer
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Hartmann, J., Knöpfler, G., Quoos, H., & Löffler, H. (1991). Tages- und jahresperiodische Vertikalwanderung der Fische im Bodensee (Vol. 4).
Schlüsselwörter: Fisch, Wanderung, Periodisch, Bodensee, Fischerei
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Hofer, R., & Bucher, F. (1991). Zur Biologie und Gefährdung der Koppe (Vol. 44).
Schlüsselwörter: Groppe, Cottus gobio, Fisch, Biologie, Gefährdung
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Salewski, V. (1991). Untersuchungen zur Ökologie und Biometrie einer Bachneunaugen-Population (Lampetra planeri) im Odenwald (Vol. 4).
Schlüsselwörter: Neunauge, Lampetra planeri, Biometrie, Bachneunauge, Vorkommen, Wachstum
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Schmidt, G. W. (1991). Versuche zur Wiedereinbürgerung des Lachses, Salmo salar L., in den Rhein-Nebenfluss Sieg (Vol. 5).
Schlüsselwörter: Wiedereinbürgerung, Lachs, Salmo salar, Fisch, Sieg
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