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Each coin has 2 sides: a positive role of alien Potamopyrgus antipodarum (Grey, 1843) snails in reducing the infection of native lymnaeids with trematodes

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Current Zoology 2024年第2期70卷 262-269页

作者： Anna Cichy Anna Stanicka Elzbieta Zbikowska Faculty of Biological and Veterinary Sciences Nicolaus Copernicus University in TorunLwowska 187-100 TorunPoland

The change in the distribution of organisms in freshwater ecosystems due to natural or manmade processes raises the question of the impact of alien species on local *** most studies indicate a negative effect,the positive one is more difficult to discern,espe-cially in multispecies systems,including hosts and *** purpose of the study was to check whether the presence of an alien host,Potamopyrgus antipodarum,reduces the intensity of Echinoparyphium aconiatum metacercariae in a native host,Radix *** additionally tested the impact of water temperature and the biomass of the alien host on the dilution *** experimentally studied(1)the lifespan of echinostome cercariae in different temperatures,(2)the infectivity of cercariae toward the alien host and native host,and(3)the impact of different biomass of the alien host on the intensity of metacercariae in the native *** found that cercarial survival and infectivity were tem-perature ***,cercarial survival decreased with increasing temperature,contrary to cercarial *** cercariae entered the renal cavity of both the native host and alien host,and successfully transformed into *** number of metacercariae in the native host decreased with the increasing biomass of the alien *** results indicate that lymnaeids may benefit from the co-occur-rence with P antipodarum,as the presence of additional hosts of different origins may reduce the prevalence of parasites in native ***,the scale of the dilution effect depends not only on the increased spectrum of susceptible hosts but also on the other variables of the environment,including water temperature and host density.

关键词： biological invasion density dilution effect echinostomes Radix spp. temperature.

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Investigation of cryptic diversity and occurrence of echinostome metacercariae infection in Anentome helena (von dem Busch, 1847)

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Asian Pacific Journal of Tropical Medicine 2018年第10期11卷 590-596页

作者： Nithinan Chomchoei Chalobol Wongsawad Nattawadee Nantarat Department of Biology Faculty of Science Chiang Mai University Graduate School Chiang Mai University Applied Parasitology Research Laboratory Department of Biology Faculty of Science Chiang Mai University Environmental Science Research Center Faculty of Science Chiang Mai University Science and Technology Research Institute Chiang Mai University

Objective: To investigate the parasitic infection of Anentome helena(A. helena) and determine the validity of species boundaries for A. helena by combining molecular phylogeny and morphological approaches. Methods: A total of 325 individuals of A. helena were collected throughout northern Thailand. Shells were measured and compared by t-test. Radulae were investigated by using light and scanning electron microscope. Two partial mitochondrial DNA sequences of COI and 16S rRNA from 36 specimens of A. helena and related species were used to test the validity of the morphospecies. Phylogenetic trees were constructed using neighbour joining, maximum likelihood and Bayesian inference. Infection of A. helena with trematode larva was examined and observed. Results: Morphological examination of A. helena revealed 2 distinct morphospecies. Genetic divergences supported the separation of the two morphotypes into two distinct groups. Both individual and combined analyses of the two nucleotide fragments revealed two phylogroups that corresponded with shell and radula characteristics. In addition, A. helena was found infected with 37-collar spined echinostome metacercariae. The prevalence and intensity of metacercariae was highest in the San Kamphaeng district, Chiang Mai province, with 7.5% and 1.670±0.577, at comprehensive taxonomic respectively. Conclusions: These findings suggest thision of this unrecognised species complex is needed. This study represents the preliminary step to reveal new data on the recent distribution of trematode infection in A. helena. This information may be useful for developing conservation management of the snail and the practice of targeted regimes to reduce anthelmintic resistance in the future.

关键词： Phylogeny Freshwater snail echinostomes Biodiversity Anentome

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Genetic variation and phylogenetic relationship of Hypoderaeum conoideum(Bloch, 1782) Dietz, 1909(Trematoda: Echinostomatidae) inferred from nuclear and mitochondrial DNA sequences

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Asian Pacific Journal of Tropical Medicine 2020年第11期13卷 515-520页

作者： Chairat Tantrawatpan Weerachai Saijuntha Division of Cell Biology Department of Preclinical SciencesFaculty of MedicineThammasat UniversityRangsit CampusPathumthani 12120Thailand Walai Rukhavej Botanical Research Institute Mahasarakham UniversityMaha Sarakham 44150Thailand

Objective:To explore genetic variations of Hypoderaeum conoideum collected from domestic ducks from 12 different localities in Thailand and Lao PDR,as well as their phylogenetic relationship with American and European ***:The nucleotide sequences of their nuclear ribosomal DNA(ITS),mitochondrial cytochrome c oxidase subunit 1(CO1),and NADH dehydrogenase subunit 1(ND1)were used to analyze genetic diversity ***:We found relatively high levels of nucleotide polymorphism in ND1(4.02%),whereas moderate and low levels were observed in CO1(2.11%)and ITS(0.96%),*** on these polymorphisms,the 20 ND1,12 CO1,and 18 ITS haplotypes were classified,and several common haplotypes were observed in all *** least three major lineages,namely American,European and Asian lineages,have been classified by phylogenetic analyses based on ND1 ***:Our report demonstrates that the ND1 gene is the most suitable genetic marker to explore genetic variation and phylogenetic relationship of Hypoderaeum ***,a combination of all loci for ND1,CO1 and ITS would be of great value toward further genetic investigation of this endemic worldwide ***,comprehensive molecular genetic analyses of Hypoderaeum conoideum from its worldwide distribution is needed to further understanding of the evolutionary and systematic relationships of this parasite.

关键词： echinostomes Genetic diversity Genetic differentiation Nuclear ribosomal DNA Cytochrome c oxidase subunit 1 NADH dehydrogenase subunit 1

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Multilocus enzyme electrophoresis analysis of Echinostoma revolutum and Echinostoma malayanum(Trematoda:Echinostomatidae) isolated from Khon Kaen Province,Thailand

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Asian Pacific Journal of Tropical Medicine 2010年第8期3卷 633-636页

作者： Weerachai Saijuntha Sumonta Tapdara Chairat Tantrawatpan Walai Rukhavej Botanical Research Institute(WRBRI) Mahasarakham UniversityMahasarakhamThailand Clinical Pathology Laboratory Amnatcharoen hospitalAmnatcharoenThailand Division of Cell Biology Department of Preclinical SciencesFaculty of MedicineThammasat UniversityRangsit CampusPathumthaniThailand

Objective:To explore the genetic variation and differentiation of 2 echinostomes from genus Echinostoma,*** revolutum(***) and Echinostoma malayanum(E. malayanum) from Khon Kaen Province,***:These parasites were compared at 22 enzymes encoding a presumptive 30 loci by using multilocus enzyme electrophoresis (MEE) ***:Twenty-two loci can be used as diagnostic markers to differentiate these 2 *** and *** had fixed genetic differences at 70%of loci, whereas both species had fixed genetic differences from the liver fluke,Opisthorchis viverrini at 91%of *** variation within a population of *** was observed at 5 polymorphic ***:MEE is a powerful technique to investigate genetic variation and differentiation of *** and ***.

关键词： Echinostoma echinostomes Genetic variation Multilocus enzyme electrophoresis Allozyme

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