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dc.contributor.authorMarjomäki, Timo
dc.contributor.authorPaloniemi, Marko
dc.contributor.authorKeskinen, Tapio
dc.contributor.authorKuha, Jonna
dc.contributor.authorKarjalainen, Juha
dc.date.accessioned2015-10-20T10:14:18Z
dc.date.available2015-10-20T10:14:18Z
dc.date.issued2015
dc.identifier.citationMarjomäki, T., Paloniemi, M., Keskinen, T., Kuha, J., & Karjalainen, J. (2015). Empirical Estimation of Accumulation-Induced Change in Gill Net Catch-ability : Mind the Observation Errors. <em>The Open Fish Science Journal</em>, 8, 13-22. <a href="http://dx.doi.org/10.2174/1874401X01508010013">doi:10.2174/1874401X01508010013</a> Retrieved from <a href="http://benthamopen.com/contents/pdf/TOFISHSJ/TOFISHSJ-8-13.pdf">http://benthamopen.com/contents/pdf/TOFISHSJ/TOFISHSJ-8-13.pdf</a>
dc.identifier.otherTUTKAID_67428
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/47337
dc.description.abstractWe analyzed cumulative catches for 24 h gill net exposures divided into 4*6 h, 2*12 h and 1*24 h soak time treatments to estimate the reduction in its catchability due to accumulation of fish. The effects of loss of catch during net lifting, disturbance effect and fouling were eliminated as far as possible to reveal the true effect of accumulation. First we applied simple nonparametric and parametric tests in comparison of treatments. As expected, considerable reduction in catchability took place along with the increase in soak time, indicated by significantly lower total 24 h catches from longer soaks in comparison with shorter ones. The reduction was more pronounced for roach than for perch. Further, we compared a functional relationship regression (FRR), admitting correctly observation error variance also in the x-axis variable, with ordinary least squares regression (OLS) in modelling the relationship between cumulative 24 h catches for different treatments. We estimated the between-replicates proportional observation error variance within a treatment and found it to be similar in different treatments. Therefore the variance ratio could be assumed to be close to 1 enabling the use of major axis solution FRR. In this particular case the incorrect use of OLS obviously gives a seriously biased result, exacerbating the negative effect of accumulation for high x-axis values in comparison with FRR. We recommend the use of FRR for any analysis comparing different notoriously low precision fish abundance proxies.
dc.language.isoeng
dc.publisherBentham Science Publishers
dc.relation.ispartofseriesThe Open Fish Science Journal
dc.relation.urihttp://benthamopen.com/contents/pdf/TOFISHSJ/TOFISHSJ-8-13.pdf
dc.subject.otheraccumulation
dc.subject.otherbias
dc.subject.othercatchability
dc.subject.othererror in variables
dc.subject.othersaturation
dc.titleEmpirical Estimation of Accumulation-Induced Change in Gill Net Catch-ability : Mind the Observation Errors
dc.identifier.urnURN:NBN:fi:jyu-201510203421
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosThe Department of Biological and Environmental Scienceen
dc.contributor.oppiaineAkvaattiset tieteet
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2015-10-20T09:15:06Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.format.pagerange13-22
dc.relation.issn1874-401X
dc.relation.volume8
dc.type.versionpublishedVersion
dc.rights.copyright© This is an open access article distributed under the terms of the Creative Commons Attribution License.
dc.rights.accesslevelopenAccessfi
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/legalcode
dc.relation.doi10.2174/1874401X01508010013


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