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Autor  |
France, R.; Holmes, J.; Lynch, A. |
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Titel |
Use of size-frequency data to estimate the age composition of crayfish populations |
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Zeitschrift, Artikel |
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Jahr |
1991 |
Publikation |
CAN. J. FISH. AQUAT. SCI. |
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48 |
Ausgabe |
12 |
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Schlüsselwörter |
Krebs, lÄngenfrequenz, methode, statistik, population |
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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. |
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Rufnummer |
301 |
Signatur |
2169 |
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