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      Use of negative binomial distribution to describe the presence of Anisakis in Thyrsites atun Translated title: Uso de distribuição binomial negativa para descrever a presença de Anisakis em Thyrsites atun

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          Abstract

          Nematodes of the genus Anisakis have marine fishes as intermediate hosts. One of these hosts is Thyrsites atun, an important fishery resource in Chile between 38 and 41° S. This paper describes the frequency and number of Anisakis nematodes in the internal organs of Thyrsites atun. An analysis based on spatial distribution models showed that the parasites tend to be clustered. The variation in the number of parasites per host could be described by the negative binomial distribution. The maximum observed number of parasites was nine parasites per host. The environmental and zoonotic aspects of the study are also discussed.

          Translated abstract

          Nematóides do gênero Anisakis têm nos peixes marinhos seus hospedeiros intermediários. Um desses hospedeiros é Thyrsites atun, um importante recurso pesqueiro no Chile entre 38 e 41° S. Este artigo descreve a freqüência e o número de nematóides Anisakis nos órgãos internos de Thyrsites atun. Uma análise baseada em modelos de distribuição espacial demonstrou que os parasitos tendem a ficar agrupados. A variação numérica de parasitas por hospedeiro pôde ser descrita por distribuição binomial negativa. O número máximo observado de parasitas por hospedeiro foi nove. Os aspectos ambientais e zoonóticos desse estudo também serão discutidos.

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          Most cited references36

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          Biostatistical Analysis

          Designed for one/two-semester, junior/graduate-level courses in Biostatistics, Biometry, Quantitative Biology, or Statistics, the latest edition of this best-selling biostatistics text is both comprehensive and easy to read. It provides a broad and practical overview of the statistical analysis methods used by researchers to collect, summarize, analyze, and draw conclusions from biological research data. The Fourth Edition can serve as either an introduction to the discipline for beginning students or a comprehensive procedural reference for today's practitioners.
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            Nematode parasites of vertebrates: their development and transmission.

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              Patterns of macroparasite aggregation in wildlife host populations.

              Frequency distributions from 49 published wildlife host-macroparasite systems were analysed by maximum likelihood for goodness of fit to the negative binomial distribution. In 45 of the 49 (90%) data-sets, the negative binomial distribution provided a statistically satisfactory fit. In the other 4 data-sets the negative binomial distribution still provided a better fit than the Poisson distribution, and only 1 of the data-sets fitted the Poisson distribution. The degree of aggregation was large, with 43 of the 49 data-sets having an estimated k of less than 1. From these 49 data-sets, 22 subsets of host data were available (i.e. host data could be divided by either host sex, age, where or when hosts were sampled). In 11 of these 22 subsets there was significant variation in the degree of aggregation between host subsets of the same host-parasite system. A common k estimate was always larger than that obtained with all the host data considered together. These results indicate that lumping host data can hide important variations in aggregation between hosts and can exaggerate the true degree of aggregation. Wherever possible common k estimates should be used to estimate the degree of aggregation. In addition, significant differences in the degree of aggregation between subgroups of host data, were generally associated with significant differences in both mean parasite burdens and the prevalence of infection.

                Author and article information

                Journal
                rbpv
                Revista Brasileira de Parasitologia Veterinária
                Rev. Bras. Parasitol. Vet.
                Colégio Brasileiro de Parasitologia Veterinária (Jaboticabal, SP, Brazil )
                0103-846X
                1984-2961
                March 2012
                : 21
                : 1
                : 78-80
                Affiliations
                [01] orgnameUniversidad Católica de Temuco orgdiv1Facultad de Recursos Naturales orgdiv2Escuela de Medicina Veterinaria
                [02] orgnameUniversidad Católica de Temuco orgdiv1Facultad de Recursos Naturales orgdiv2Escuela de Ciencias Ambientales
                Article
                S1984-29612012000100017 S1984-2961(12)02100117
                6eee5529-d5db-4481-8a1b-af1cf370fcd8

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 26 October 2011
                : 14 June 2011
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 3
                Product

                SciELO Brazil

                Categories
                Research Note

                Thyrsites atun,Nematóide,Anisakis,distribuição binomial negativa,Nematode,negative binomial distribution

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