Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 429906
Title Extracting a century of preserved molecular and population demographic data from archived otoliths in the endangered European eel (Anguilla anguilla L.)
Author(s) Schaerlaekens, D.G.; Dekker, W.; Wickstrom, H.; Volckaert, F.A.M.; Maes, G.E.
Source Journal of Experimental Marine Biology and Ecology 398 (2011)1-2. - ISSN 0022-0981 - p. 56 - 62.
Department(s) IMARES Vis
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) cod gadus-morhua - old scale samples - age-determination - dna extraction - ancient dna - microsatellite loci - genetic analyses - north-sea - amplification - conservation
Abstract Archived otolith collections represent an invaluable source of information to study demographic and genetic changes in commercially important fish populations. Studies combining both approaches are however rare and reliable extraction of molecular and population demographic data from the same collection of otoliths has never been assessed in the endangered European eel (Anguilla anguilla L). Here we evaluate various DNA extraction protocols to compare DNA yield, microsatellite amplification success, genotype integrity and precision of age determination for eel otoliths that have been archived for 4 weeks, and for 28 and 48 years. Our results show a high amplification success and an equal genotype integrity for DNA fragments extracted from both recently sampled otoliths and high quality reference DNA tissue. Although historical samples yielded low amounts of DNA. PCR amplification was successful and genotyping reliable for short fragments, but decreased significantly with PCR fragment size. None of the extraction protocols caused physical damage to the otoliths and precision of age determination was high for both treated and untreated otoliths. Hence, the methodology can be applied as a standard for the further joint analysis of past demographic and genetic changes during the last century in the highly exploited European eel and in other fish requiring urgent conservation measures.
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