{"refrec":{"BRefID":58707,"RR":"<b>Harbitz, A.; Aschan, M.</b> (2003). A two-dimensional geostatistic method to simulate the precision of abundance estimates. <i>Can. J. Fish. Aquat. Sci. 60(12)</i>: 1539-1551","BEntID":56278,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Can. J. Fish. Aquat. Sci. 60(12)</i>: 1539-1551","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Harbitz, A.; Aschan, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Harbitz, A.; Aschan, M.","Englishabstract":"In this paper, we outline a geostatistic method to simulate the relative precision (coefficient of variation, CV) of total abundance estimates of one species in a predetermined, stratified area when it is appropriate to treat the observations within each stratum as realizations of a second-order homogenous and ergodic random process. To model the spatial correlations, a variogram is fitted to normal-transformed values of the original observations. Based on the variogram and its corresponding covariance matrix, extensive simulations on a fine grid that includes the sample locations provide random realizations of the process. The normal values are back-transformed to original observation space by nonparametric reversed bootstrap, as well as by a parametric Weibull approach. The method is applied to a total of 1069 shrimp (<i>Pandalus borealis</i>) abundance observations from 11 annual surveys in the Barents Sea (1992-2002) where a 20 nautical mile sampling grid has been applied. On average, the CV was estimated to be 6.4% for the applied regular grid when the simulations were conditional on the observations, compared with 8.1% when the sampling locations within each of the six strata were random.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"A two-dimensional geostatistic method to simulate the precision of abundance estimates","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:01.897972","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2003,"MonPub":null,"DateUpdate":"2004-03-23","DateCreate":"2004-03-23","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000188752800011","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":58707,"PubliDate":2003,"Pagination":"1539-1551","XtraPublOfAnaID":null,"ISBN":null,"Volume":"60","Issue":"12","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42535,"SerRR":"Canadian Journal of Fisheries and Aquatic Sciences = Journal canadien des sciences halieutiques et aquatiques. 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