Use of negative binomial distribution to describe the presence of Anisakis in Thyrsites atun

Peña-Rehbein, Patricio; Ríos-Escalante, Patricio De los

doi:10.1590/s1984-29612012000100017

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…Count data that originate from different fields of study typically follow a Poisson, negative binomial, or in some cases, binomial distribution [5]. For instance, these distributions have often been used to analyze and model count data in scientific fields such as parasitology [6], veterinary medicine [7], ornithology [8], and estimation of ore reserves [9]. However, their application in the analysis of the distribution of tree species is not very common.…”

Section: Introductionmentioning

confidence: 99%

Modeling Tree Species Count Data in the Understory and Canopy Layer of Two Mixed Old-Growth Forests in the Dinaric Region

Keren

2020

Forests

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The distribution of tree species has traditionally been analyzed based on tree diameter (DBH) as a continuous variable. However, this approach does not usually provide information on how species are distributed across the area of interest. In this study, an inverse approach was applied to investigate tree distribution patterns in two Dinaric old-growth forest stands composed primarily of European beech, silver fir, and Norway spruce. Specifically, the variance-to-mean relationship of tree counts based on 80 plots (40 in each old-growth stand) were evaluated by using a dispersion index. Understory trees exhibited clumped and random patterns, whereas canopy trees were mostly distributed in a random manner. A regular pattern was only determined for beech and all trees in the canopy layer (two cases out of ten). The observed discrete variables were further compared with three theoretical distributions. It was found that a Poisson, binomial, and negative binomial model best fitted the observed count data, which, based on the dispersion index, exhibited a random, regular, and clumped pattern, respectively. The frequency of plots with low species presence and complete absence of species was also revealed. Consequently, the analysis and modeling of tree counts can be of practical use for species conservation purposes.

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Section: Introductionmentioning

confidence: 99%

Modeling Tree Species Count Data in the Understory and Canopy Layer of Two Mixed Old-Growth Forests in the Dinaric Region

Keren

2020

Forests

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“…The presence of parasites in the host organism, especially in the intestine, may result in both structural and metabolic alterations, which may be reflected in a variety of pathological processes, and may even result in the death of the host in some cases (ROCHA et al, 2010;PEÑA-REHBEIN;RÍOS-ESCALANTE, 2012). The present study describes the anatomopathological and ultra-structural features of parasitic infestation of the intestinal tract of the parrot pufferfish (Colomesus psittacus) by Rohdella sp.…”

Section: Introductionmentioning

confidence: 99%

Anatomopathological study of parrot pufferfishColomesus psittacus parasitized by the aspidogastreanRohdella sp.

Velasco

Videira

Tortelly

et al. 2013

Rev. Bras. Parasitol. Vet.

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Anatomopathological study of parrot pufferfishColomesus psittacus parasitized by the aspidogastrean Rohdella sp. AbstractAspidogastrea are globally-distributed parasites of the class Trematoda, which have been described as pathogens of a range of aquatic organisms, in marine and freshwater environments. The principal morphological characteristic of the group is an adhesive ventral disc, which is responsible for fixing the parasite to the host organism. In this study, 112 specimens of Colomesus psittacus from the municipality of Cametá, in the state of Pará (Brazil), were necropsied. Platyhelminthes of the genus Rohdella attached to the mucous membrane of the fish's intestine by the adhesive disc were observed. Fragments of parasitized tissue were fixed in Davidson solution and then processed and stained with hematoxylin-eosin. Other fragments were fixed in glutaraldehyde, processed and observed under a scanning electron microscope. The prevalence of the parasite was 76.4%, mean intensity of infection was 8.0 and mean abundance was 6.2. The parasitism provoked chronic enteritis with diffused inflammatory infiltration. The adherence of the parasite to the mucous membrane of the intestine resulted in strangulation and hyperplasia of the region, as well as causing hypertrophy of the muscle of the mucous membrane. The present study describes the anatomopathological and ultrastructural aspects of the parasitism of the intestine of C. psittacus by Rohdella sp.Keywords: Amazonia, parrot puffer fish, intestine, parasite, histopathology, Rohdella sp. ResumoOs Aspidogastreas são parasitos da classe Trematoda, distribuídos globalmente e têm sido descritos como patógenos em uma gama de organismos aquáticos de ambientes marinhos e de água doce. A principal característica morfológica do grupo é um disco adesivo na região ventral responsável pela fixação do parasito no organismo hospedeiro. Neste estudo, 112 espécimes de Colomesus psittacus provenientes do município de Cametá, no estado do Pará (Brasil), foram necropsiados. Foram observados platelmintos do gênero Rohdella aderidos à mucosa intestinal através do disco adesivo. Fragmentos de tecido com parasito foram fixados em solução de Davidson e processados e corados em Hematoxilina-Eosina. Outros fragmentos foram fixados em glutaraldeído, processados e observados em microscopia eletrônica de varredura. A prevalência parasitária foi de 76, 4%, intensidade média de infecção de 8,0 e abundância média de 6,2. O parasitismo ocasionou uma enterite crônica com difuso infiltrado inflamatório. A fixação do parasito na mucosa intestinal provocou estrangulamento e hiperplasia da região, bem como hipertrofia da muscular da mucosa. O presente trabalho descreve os aspectos anatomopatológicos e ultra-estruturais da ação parasitária por Rohdella sp. no trato intestinal de C. psittacus.Palavras-chave: Amazônia, baiacu papagaio, intestino, parasito, histopatologia, Rohdella sp. Rev. Bras. Parasitol. Vet., Jaboticabal, v. 22, n. 1, p. 29-33, jan.-mar. 2013 Silva, M.V.O. et al.Rev. Bras. Pa...

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Spatial patterns of Pisidium chilense (Mollusca Bivalvia) and Hyalella patagonica (Crustacea, Amphipoda) in an unpolluted stream in Navarino island (54° S, Cape Horn Biosphere Reserve)

Escalante

Mansilla

2017

Journal of King Saud University - Science

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Use of negative binomial distribution to describe the presence of Anisakis in Thyrsites atun

Cited by 7 publications

References 27 publications

Modeling Tree Species Count Data in the Understory and Canopy Layer of Two Mixed Old-Growth Forests in the Dinaric Region

Modeling Tree Species Count Data in the Understory and Canopy Layer of Two Mixed Old-Growth Forests in the Dinaric Region

Anatomopathological study of parrot pufferfishColomesus psittacus parasitized by the aspidogastreanRohdella sp.

Spatial patterns of Pisidium chilense (Mollusca Bivalvia) and Hyalella patagonica (Crustacea, Amphipoda) in an unpolluted stream in Navarino island (54° S, Cape Horn Biosphere Reserve)

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