Bayesian methods using mtDNA data are developed to compare single- and multiple-stock hypotheses.... more Bayesian methods using mtDNA data are developed to compare single- and multiple-stock hypotheses. The likelihood of the data is assumed to be multinomial and the multivariate prior for the probability of an individual having a particular haplotype is assumed to be of the Dirichlet-b form. The values for the parameters of this prior are either determined using an Empirical Bayes approach or assumed to be distributed according to a log-normal hyper-prior (the ‘Full Bayes’ approach). The Empirical and Full Bayes methods are examined using simulation. The performance of the Empirical Bayes method is found to be much worse than that of the Full Bayes method. Illustrative comparisons for North Pacific minke whales based on the latter method confirm previous results that sub-areas 6 and 7 contain different stocks. Results of the application of this method to the mtDNA data for the sub-areas to the east of Japan, although generally uninformative, are nevertheless consistent with analyses ba...
Antarctic minke whales,Balaenoptera bonaerensis, breed in tropical and temperate waters of the So... more Antarctic minke whales,Balaenoptera bonaerensis, breed in tropical and temperate waters of the Southern Hemisphere in winter and feed in Antarctic grounds in the austral summer. These seasonal migrations could be less defined than those of other whale species, but the evidence is scanty. We quantitatively describe the epibiotic fauna of Antarctic minke whales and explore its potential to trace migrations. Seven species were found on 125 out of 333 examined Antarctic minke whales captured during the last Antarctic NEWREP-A expedition in the Southern Ocean: the amphipodBalaenocyamus balaenopterae(prevalence = 22.2%), the copepodPennella balaenoptera(0.6%); three coronulid, obligate barnacles,Xenobalanus globicipitis(11.1%),Coronula reginae(8.7%),C. diadema(0.9%); and two lepadid, facultative barnacles,Conchoderma auritum(9.0%) andC. virgatum(0.3%). Species with prevalence > 8% exhibited a modest increase in their probability of occurrence with whale body length. Data indicated posi...
Bayesian methods using mtDNA data are developed to compare single- and multiple-stock hypotheses.... more Bayesian methods using mtDNA data are developed to compare single- and multiple-stock hypotheses. The likelihood of the data is assumed to be multinomial and the multivariate prior for the probability of an individual having a particular haplotype is assumed to be of the Dirichlet-b form. The values for the parameters of this prior are either determined using an Empirical Bayes approach or assumed to be distributed according to a log-normal hyper-prior (the ‘Full Bayes’ approach). The Empirical and Full Bayes methods are examined using simulation. The performance of the Empirical Bayes method is found to be much worse than that of the Full Bayes method. Illustrative comparisons for North Pacific minke whales based on the latter method confirm previous results that sub-areas 6 and 7 contain different stocks. Results of the application of this method to the mtDNA data for the sub-areas to the east of Japan, although generally uninformative, are nevertheless consistent with analyses ba...
Antarctic minke whales,Balaenoptera bonaerensis, breed in tropical and temperate waters of the So... more Antarctic minke whales,Balaenoptera bonaerensis, breed in tropical and temperate waters of the Southern Hemisphere in winter and feed in Antarctic grounds in the austral summer. These seasonal migrations could be less defined than those of other whale species, but the evidence is scanty. We quantitatively describe the epibiotic fauna of Antarctic minke whales and explore its potential to trace migrations. Seven species were found on 125 out of 333 examined Antarctic minke whales captured during the last Antarctic NEWREP-A expedition in the Southern Ocean: the amphipodBalaenocyamus balaenopterae(prevalence = 22.2%), the copepodPennella balaenoptera(0.6%); three coronulid, obligate barnacles,Xenobalanus globicipitis(11.1%),Coronula reginae(8.7%),C. diadema(0.9%); and two lepadid, facultative barnacles,Conchoderma auritum(9.0%) andC. virgatum(0.3%). Species with prevalence > 8% exhibited a modest increase in their probability of occurrence with whale body length. Data indicated posi...
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Papers by Luis Pastene