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Morphological and molecular characterisation of an intestinal trematode from the marbled lungfish Protopterus aethiopicus in Kenya reveals a new species of Heterorchis (Digenea: incertae sedis) 肯尼亚大理石纹肺鱼原生肺(Protopterus aethiopicus)肠吸虫的形态和分子特征揭示了异吸虫新种(Digenea: incertae sedis)
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-27 DOI: 10.1016/j.ijppaw.2025.101182
Nehemiah M. Rindoria , José C. Dumbo , Felix O. Olonde , Iva Přikrylová , Willem J. Smit , Wilmien J. Luus-Powell
Heterorchis Baylis, 1915, is a poorly reported genus of parasitic digeneans with ambiguous phylogenetic affinities. Four members of this genus have been described exclusively from Africa, although two of these taxa are regarded as species inquirenda. The material for this study was collected from the intestine of Marbled lungfish, Protopterus aethiopicus Heckel, 1851, in Lake Kanyaboli, Kenya, between May and October 2023. An integrated approach of light microscopy, scanning electron microscopy (SEM), and molecular techniques was employed in the study of the trematode. Morphological analysis revealed a new species characterised by distinctive features, including the extent of the intestinal caeca in the post-excretory vesicle field, a large excretory pore located posterior to the testes, and the cirrus-sac reaching the level of the seminal receptacle. Phylogenetic trees from Bayesian Inference and maximum-likelihood analyses of the 28S rDNA dataset formed a separate clade comprising sequences of Heterorchis spp. The interspecific distance of 2 % (25 bp) was calculated between the present sequence and those available on GenBank, MW586924, for Heterorchis cf. crumenifer Baylis, 1915. The infection indices were recorded as prevalence (P) = 46.7 %, mean intensity (MI) = 1.25, and mean abundance (MA) = 0.58.
Heterorchis Baylis, 1915年,是一种寄生虫属,系统发育亲缘关系模糊。该属的四个成员被描述为仅来自非洲,尽管其中两个分类群被认为是调查种。本研究的材料是在2023年5月至10月期间从肯尼亚Kanyaboli湖的大理石肺鱼,Protopterus aethiopicus Heckel, 1851年的肠道中收集的。采用光学显微镜、扫描电镜和分子技术对吸虫进行了综合研究。形态学分析显示该新种具有独特的特征,包括肠盲肠在排泄后囊区的范围,位于睾丸后方的大排泄孔,以及达到精囊水平的卷囊。从28S rDNA数据集的贝叶斯推断和最大似然分析得出的系统发育树形成了一个由Heterorchis spp序列组成的独立进化支。计算了该序列与GenBank MW586924上的Heterorchis cf. crumenifer Baylis, 1915的种间距离为2% (25 bp)。感染指数为患病率(P) = 46.7%,平均强度(MI) = 1.25,平均丰度(MA) = 0.58。
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引用次数: 0
Zoonotic nematode larvae in Greenland halibut (Reinhardtius hippoglossoides) from Greenlandic waters: Occurrence, fillet distribution and association with Mushy halibut syndrome 格陵兰水域大比目鱼(Reinhardtius hippoglossoides)的人畜共患线虫幼虫:发生、鱼片分布及其与糊状大比目鱼综合征的关系
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-24 DOI: 10.1016/j.ijppaw.2025.101181
Natacha L. Severin , Andrea K. Bisbjerg , Kitt U. Ristinge , Kaan Kumas , Liliana I. Ferrão , Per W. Kania , Kurt Buchmann
Zoonotic anisakid nematodes commonly infect wild fish, and their presence in commercially caught species represents a consumer hazard due to risk of anisakidosis. The Greenland halibut (GLH) is a species of high commercial value to many countries, including Kalaallit Nunaat (Greenland), where GLH is the second most exported marine species. Despite this, the occurrence of anisakid nematodes in the flesh of GLH remains poorly studied. Additionally, the relationship between anisakid infection and ‘Mushy halibut syndrome’ (MHS), a condition affecting the fillet quality of GLH, has not been investigated. The aim of this study was to extend our knowledge of the occurrence of anisakid nematodes in GLH, with emphasis on fillet distribution, and explore associations with MHS. GLH (n = 104) from three offshore fishing grounds underwent necropsy and parasitological examination of the main fillet and belly flaps. Overall prevalence of third-stage larval infection was 44.2 %, while mean intensity and abundance were 4.6 and 1.3, respectively. When examining the fillets, third-stage larvae were predominantly found in the belly flaps. For a subsample of fish (n = 55), the investigation included parasitological examination of the body cavity and liver as well as extended necropsy, quality index method assessment and age estimation. The isolated third-stage larvae belonged to three species: Anisakis simplex s. s. was most common (n = 721), followed by Contracaecum osculatum (n = 36). Phocanema bulbosa was found in the body cavity and liver only (n = 11). MHS was associated with higher infection levels in the belly flaps and liver, lower condition factor and higher gonadosomatic index. The results presented here have implications for wild fish stock monitoring and food safety. Recording of the parasite prevalence and distribution in GLH can assist risk management and provide information on the status of the fish species in the ecosystem.
人畜共患的大茴香线虫通常感染野生鱼类,它们在商业捕捞的鱼类中存在,由于大茴香线虫病的风险,对消费者构成危害。格陵兰大比目鱼(GLH)是一种对许多国家具有高商业价值的物种,包括Kalaallit Nunaat(格陵兰),GLH是第二大出口海洋物种。尽管如此,在GLH肉中发生的茴香线虫的研究仍然很少。此外,茴香碱感染与影响GLH鱼片质量的“糊状大比目鱼综合征”(MHS)之间的关系尚未研究。本研究的目的是扩大我们对GLH中大麻类线虫发生的认识,重点关注鱼片分布,并探讨与MHS的关系。对来自三个近海渔场的GLH (n = 104)进行了尸检和主要鱼片和腹部皮瓣的寄生虫学检查。第三期幼虫感染总体流行率为44.2%,平均感染强度为4.6%,平均感染丰度为1.3%。在检查鱼片时,第三期幼虫主要在腹部皮瓣中发现。对于鱼的一个亚样本(n = 55),调查包括体腔和肝脏的寄生虫学检查以及扩展尸检,质量指数方法评估和年龄估计。分离到的三期幼虫有3种,其中以单一异尖线虫(Anisakis simplplex s. s.)最多(721只),其次是osculatum Contracaecum(36只)。只在体腔和肝脏发现球型火斑病(n = 11)。MHS与腹部皮瓣和肝脏较高的感染水平、较低的条件因子和较高的性腺指数有关。研究结果对野生鱼类资源监测和食品安全具有指导意义。记录GLH中寄生虫的流行和分布有助于风险管理,并提供有关生态系统中鱼类状况的信息。
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引用次数: 0
Hydatigera krepkogorski from Asiatic wild cat (Felis silvestris ornata) in Tarim Basin of Xinjiang, northwestern China: a case report 新疆塔里木盆地亚洲野猫(Felis silvestris ornata)中的krepkogorski包虫病例报告
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-24 DOI: 10.1016/j.ijppaw.2025.101180
Peiyue Deng , Shanshan Zhao , Guanhao Feng , Suwen Wang , Wenbo Tan , Yuanzhi Wang , Gang Liu
To date, there has been no report on Hydatigera species (Cestoda: Cyclophyllidea) in Asiatic wild cat (Felis silvestris ornata). In this study, we reported a case: a total of 99 tapeworms were found in a nature-killed Asiatic wild cat in Tarim Basin, Xinjiang Uygur Autonomous Region (XUAR, northwestern China). Based on morphological characteristics and two genetic markers, the cytochrome c oxidase subunit I (cox1) and 16S rDNA genes, ten representative tapeworms were identified as Hydatigera krepkogorski. Furthermore, phylogenetic tree analysis indicated that the tapeworms in an Asiatic wild cat was the closest to H. krepkogorski in wild rodents in Turpan region, XUAR. This work firstly describes H. krepkogorski in the Asiatic wild cat.
在亚洲野猫(Felis silvestris ornata)中,尚未见包虫科(包虫科:包虫科)的报道。本研究报告了在新疆塔里木盆地一只自然死亡的亚洲野猫身上共发现99条绦虫的病例。根据形态特征和细胞色素c氧化酶亚基I (cox1)和16S rDNA基因两个遗传标记,鉴定了10条代表性绦虫,并将其鉴定为克雷普科格斯基水蛭(hydatagera krepkogorski)。系统进化树分析表明,新疆吐鲁番地区一只亚洲野猫的绦虫与野生啮齿动物中krepkogorski绦虫最接近。本文首次描述了亚洲野猫中的krepkogorski。
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引用次数: 0
Life in cold blood: Exploring the cryptic diversity of species of Haemogregarina in Southern Africa's terrapins 冷血动物的生命:探索非洲南部龟类中Haemogregarina物种的神秘多样性
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-15 DOI: 10.1016/j.ijppaw.2025.101179
Monique Barnard , Daryl Codron , Haley R. Dutton , Stephen A. Bullard , Louis H. du Preez , Edward C. Netherlands
Species of Haemogregarina (Apicomplexa: Haemogregarinidae) are among the most common and widely distributed obligate apicomplexan blood parasites of primarily aquatic ectothermic vertebrates. Several species of Haemogregarina have been described infecting terrapin species globally, only two of which, Haemogregarina maputensis and Haemogregarina pelusiensi, have been described from Pelusios sinuatus, in Southern Africa. Several initial descriptions of species of Haemogregarina, including H. maputensis and H. pelusiensi, were based on the morphological analysis of erythrocytic parasite life stages. As species of Haemogregarina display high morphological similarity in the peripheral blood gamont stages, the integration of morphological and molecular techniques is essential in the study of these parasites today. Herein, the diversity of Haemogregarina species in freshwater terrapin hosts from Southern Africa is assessed using morphological and molecular techniques. Three genotypes were identified, two of which conform morphologically to H. maputensis and H. pelusiensi, warranting the supplemental description and molecular characterisation of these species. The third appears to represent a cryptic sister species of H. pelusiensi, exhibiting some variation in early developmental stages, warranting the description of a new species, Haemogregarina afrolatens n. sp.
血蛛属(顶复合体目:血蛛科)是水生变温脊椎动物中最常见和分布最广泛的专性顶复合体血寄生虫。在全球范围内,已经发现了几种感染龟类的血斑纹绦虫,其中只有两种,马氏血斑纹绦虫(Haemogregarina maputensis)和pelusiensis血斑纹绦虫(Haemogregarina pelusiensis)来自非洲南部的sinuatus。一些初步的描述,包括H. maputensis和H. pelusiensis,是基于红细胞寄生虫生命阶段的形态学分析。由于各种血绿虫在外周血淋巴细胞阶段表现出高度的形态相似性,因此形态学和分子技术的整合是当今研究这些寄生虫的必要条件。本文利用形态学和分子技术对南部非洲淡水龟宿主中Haemogregarina物种的多样性进行了评估。共鉴定出3个基因型,其中2个在形态上与马普顿猿猴和佩鲁西猿猴一致,为这些物种的补充描述和分子特征提供了依据。第三种似乎代表了佩卢西人的一个隐型姐妹种,在早期发育阶段表现出一些变异,因此有理由将其描述为一个新种,即afrolatens Haemogregarina n.sp。
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引用次数: 0
First report of the complete mitochondrial genome of an Ophidascaris species from the European hedgehog (Erinaceus europaeus) in China 中国欧洲刺猬(Erinaceus europaeus)一种麻蛔虫全线粒体基因组的首次报道
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-15 DOI: 10.1016/j.ijppaw.2025.101177
Wei Hu, Ying Xun, Rong Cheng, Tian-Yin Cheng, Lei Liu, Guo-Hua Liu
Species of the genus Ophidascaris are zoonotic nematodes primarily parasitic in snakes, but limited genomic resources have hindered phylogenetic resolution and species delineation. To date, no ascarid nematodes have been documented in hedgehogs, making this finding noteworthy. In this study, the complete mitochondrial genome of Ophidascaris sp. larvae recovered from European hedgehogs (Erinaceus europaeus) in China was sequenced using Illumina technology, annotated, and compared with published sequences. The mitogenome (14,624 bp) contains 12 protein-coding genes, 22 tRNAs, two rRNAs, and—as in other nematodes—lacks the atp8 gene. Comparative analyses showed nucleotide divergence (14.4 %–17.1 %) from O. wangi and O. baylisi, supported its distinct genetic identity. Phylogenetic analyses confirmed its placement within the Ophidascaris genus with strong statistical support. This study provides the first complete mitogenome of an Ophidascaris species recovered from a hedgehog and suggests that hedgehogs may serve as intermediate hosts, thereby expanding the known host range. The mitogenome generated here provides valuable molecular markers for species identification, phylogenetic reconstruction, and future epidemiological surveillance.
Ophidascaris属是一种主要寄生在蛇体内的人畜共患线虫,但有限的基因组资源阻碍了系统发育的解决和物种的划分。到目前为止,还没有在刺猬身上记录到蛔虫线虫,这使得这一发现值得注意。本研究利用Illumina技术对中国欧洲刺猬(Erinaceus europaeus)的Ophidascaris sp.幼虫的线粒体全基因组进行了测序、注释,并与已发表的序列进行了比较。有丝分裂基因组(14,624 bp)包含12个蛋白质编码基因,22个trna, 2个rrna,并且与其他线虫一样缺乏atp8基因。比较分析显示,wangi O.和baylisi O.的核苷酸差异(14.4% - 17.1%)支持其独特的遗传同一性。系统发育分析证实其属于麻蛔虫属,具有很强的统计学支持。本研究提供了第一个从刺猬中恢复的Ophidascaris物种的完整有丝分裂基因组,并表明刺猬可能作为中间宿主,从而扩大了已知宿主的范围。这里产生的有丝分裂基因组为物种鉴定、系统发育重建和未来的流行病学监测提供了有价值的分子标记。
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引用次数: 0
Antigenic and genotypic relatedness of buffalo-derived Theileria parva from Zambia to cattle-derived parasites and vaccine stocks 赞比亚源自水牛的细小梭菌与源自牛的寄生虫和疫苗储备的抗原和基因型相关性
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-10 DOI: 10.1016/j.ijppaw.2025.101176
Chimvwele Namantala Choopa , Walter Muleya , Lubembe Donald Mukolwe , Paul Fandamu , Kgomotso Penelope Sibeko-Matjila
The African buffalo (Syncerus caffer) is the natural reservoir of Theileria parva, a tick-transmitted protozoan parasite that severely constrains cattle production across eastern, southern, and central Africa. While the antigenic and genetic diversity of cattle-derived T. parva (causing East Coast fever) is well characterized in Zambia, little is known about the buffalo-derived parasites. The latter cause the equally fatal Corridor disease and impact the epidemiology and control of bovine theileriosis, particularly where live vaccines are used. This study investigated antigenic and genotypic diversity of T. parva from three Zambian buffalo populations, in comparison with cattle-derived parasites and vaccine stocks (Katete and Chitongo). Analysis of Tp1 and Tp2 antigen genes revealed contrasting diversity. Tp1 epitopes showed limited variation, whereas Tp2 exhibited extensive polymorphism, especially among buffalo-derived sequences. None of the variations have been previously reported in Zambia, suggesting ongoing diversification. Phylogenetic analysis showed paraphyletic clustering of buffalo and cattle parasites. However, some buffalo genotypes grouped closely with vaccine strains, suggesting potential cross-protection. Only two Tp2 sequences from buffalo-derived parasites clustered with those from cattle or vaccines, highlighting a risk of vaccine break-through. Population genetic analysis using multilocus genotyping demonstrated higher allelic richness and diversity in buffalo-derived parasites compared to cattle-derived. Although buffalo parasites showed greater multiplicity of infection (MOI) and unique alleles, principal coordinate analysis revealed limited genetic sub-structuring and shared alleles across hosts. These results suggest a common ancestry and overlapping transmission cycles. The greater MOI in buffalo populations highlights higher genetic exchange and can complicate control efforts. Overall, the study demonstrates extensive antigenic and genetic diversity of buffalo-derived T. parva in Zambia. These findings have critical implications for current vaccine efficacy, emphasizing the need for continuous molecular surveillance, strict livestock movement control, and vaccine efficacy trials to ensure effective management of T. parva infections.
非洲水牛(Syncerus caffer)是小孢子虫的天然宿主,小孢子虫是一种由蜱虫传播的原生动物寄生虫,严重限制了非洲东部、南部和中部的养牛生产。虽然来自牛的细小绦虫(引起东海岸热)的抗原性和遗传多样性在赞比亚得到了很好的表征,但对来自水牛的寄生虫知之甚少。后者引起同样致命的走廊病,并影响牛肠杆菌病的流行病学和控制,特别是在使用活疫苗的地方。本研究调查了来自三个赞比亚水牛种群的细小绦虫的抗原和基因型多样性,并与牛源寄生虫和疫苗储备(Katete和Chitongo)进行了比较。对Tp1和Tp2抗原基因的分析显示了截然不同的多样性。Tp1表位表现出有限的变异,而Tp2表位表现出广泛的多态性,特别是在水牛来源的序列中。赞比亚以前没有报告过这些变化,这表明正在进行多样化。系统发育分析显示水牛和牛寄生虫呈副葡萄聚类。然而,一些水牛基因型与疫苗株密切相关,表明可能存在交叉保护。只有两个来自水牛来源的寄生虫的Tp2序列与来自牛或疫苗的Tp2序列聚集在一起,突出了疫苗突破的风险。利用多位点基因分型的群体遗传分析表明,与牛源寄生虫相比,水牛源寄生虫的等位基因丰富度和多样性更高。尽管水牛寄生虫具有较高的感染多样性(MOI)和独特的等位基因,但主坐标分析显示,宿主之间的遗传亚结构有限,等位基因共享。这些结果表明有共同的祖先和重叠的传播周期。水牛种群中较高的MOI凸显了较高的遗传交换,并可能使控制工作复杂化。总体而言,该研究证明了赞比亚水牛来源的细小绦虫具有广泛的抗原性和遗传多样性。这些发现对目前的疫苗效力具有重要意义,强调需要持续的分子监测、严格的牲畜运动控制和疫苗效力试验,以确保有效管理细小t虫感染。
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引用次数: 0
Parasite genotype is a risk factor for Sarcocystis neurona-associated mortality in southern sea otters (Enhydra lutris nereis) 寄生虫基因型是南海獭神经元性肌囊虫相关死亡的危险因素。
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-06 DOI: 10.1016/j.ijppaw.2025.101174
Devinn M. Sinnott , Melissa A. Miller , Elizabeth VanWormer , Francesca Batac , Katherine Greenwald , Colleen Young , Pádraig J. Duignan , Margaret E. Martinez , Cara L. Field , Michael D. Harris , Heather Harris , Mary E. Gomes , Michael J. Murray , Karen Shapiro
The protozoal parasites Sarcocystis neurona and Toxoplasma gondii are important causes of mortality for threatened southern sea otters (Enhydra lutris nereis) in California. Sarcocystis neurona causes more sea otter deaths than T. gondii and has caused two mortality events, yet S. neurona is comparatively understudied. Little is known about the role of parasite genotype on the outcome of infection (fatal versus non-fatal) for S. neurona-infected sea otters. The objective of this study was to evaluate the effect of parasite genotype in addition to host and environmental factors (animal age, sex, location, and season of stranding) on disease outcome in S. neurona-infected sea otters. A multilocus sequence typing (MLST) approach was used to characterize the S. neurona genotype in fatal (n = 92) and non-fatal (n = 33) sea otter infections. In the northern study region, the IIg/j genotype was more likely to result in fatal infections. In the southern study region, the Ia and Ib/c/d/gg genotypes were the dominant genotypes implicated in fatal infections and were responsible for mortality events that occurred in 2004 (Ib/c/d/gg) and 2021 (Ia). Subadult sea otters were more likely to die from S. neurona than adults. Stranding during the California wet season during peak rainfall events that facilitate land-to-sea flow of infective sporocysts may also play a role in fatal infection outcomes. These findings suggest that parasite genotype, as well as certain host and environmental factors, all contribute to disease outcome following S. neurona infection in southern sea otters.
原生动物寄生虫神经肌囊虫和刚地弓形虫是加利福尼亚濒危南海獭(Enhydra lutris nereis)死亡的重要原因。与弓形虫相比,神经元肌囊菌导致海獭死亡的人数更多,并造成了两次死亡事件,但神经元肌囊菌的研究相对不足。关于寄生虫基因型对神经索虫感染海獭感染结果(致死性与非致死性)的作用知之甚少。本研究的目的是评估除宿主和环境因素(动物年龄、性别、地点和搁浅季节)外,寄生虫基因型对感染S.神经元海獭疾病结局的影响。采用多位点序列分型(MLST)方法对致死性(n = 92)和非致死性(n = 33)海獭感染的神经藻基因型进行了分析。在北部研究区,IIg/j基因型更易导致致死性感染。在南部研究区域,Ia和Ib/c/d/gg基因型是与致命性感染相关的主要基因型,并与2004年(Ib/c/d/gg)和2021年(Ia)发生的死亡事件有关。与成年海獭相比,亚成年海獭更容易死于神经水母。在加州雨季的高峰降雨期间搁浅,促进了传染性孢子囊从陆地向海洋的流动,也可能在致命的感染结果中发挥作用。这些发现表明,寄生虫基因型以及某些宿主和环境因素都有助于南海獭神经索菌感染后的疾病结局。
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引用次数: 0
Echinocephalus persicus n. sp. (Nematoda: Spirurida: Gnathostomatidae) from Two Batoid Hosts, Pastinachus sephen and Urogymnus asperrimus, off Southern Iran 来自伊朗南部两种蝙蝠纲寄主- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-03 DOI: 10.1016/j.ijppaw.2025.101173
Hamidreza Hadipour Kelidsar, Mohammad Haseli
Adult nematodes of the genus Echinocephalus were recovered from the intestines of two batoid species—Pastinachus sephen, collected from both the Persian Gulf and the Gulf of Oman, and Urogymnus asperrimus, collected from the Persian Gulf. Detailed morphological analyses were conducted using light and scanning electron microscopy. Based on the number, arrangement, and size of caudal papillae, along with other morphological and quantitative traits, the specimens were clearly distinguishable from previously described congeners. Consequently, Echinocephalus persicus n. sp. is formally described and added to the genus. With this addition, the total number of valid Echinocephalus species rises to 13, four of which are known from the Indian Ocean, restricted to the coastal waters of India, Sri Lanka, and Iran. Notably, Urogymnus asperrimus hosts four of the four known Echinocephalus species from the Indian Ocean—including three from Sri Lankan waters and one from southern Iran—suggesting that this batoid may represent a species complex and thus warrants further taxonomic reassessment. In addition, the external anatomy of the amphid was discussed across the genus. Observations of fixed specimens of E. persicus n. sp. indicate that intraindividual comparisons of cervical sac length should be made with caution due to potential variability among the four sacs.
在波斯湾和阿曼湾采集到的sephen pastinachus和波斯湾采集到的asperrimus两种蝙蝠类昆虫的肠道中发现了棘头线虫属成虫。利用光镜和扫描电镜对其进行了详细的形态学分析。根据尾端乳头的数量、排列和大小,以及其他形态和数量特征,这些标本与以前描述的同系物明显不同。因此,棘头虫被正式描述并添加到该属中。加上这个,有效的棘头类动物的总数增加到13种,其中4种已知来自印度洋,只分布在印度、斯里兰卡和伊朗的沿海水域。值得注意的是,urrogymnus asperrimus拥有来自印度洋的四种已知棘头类动物中的四种,包括来自斯里兰卡水域的三种和来自伊朗南部的一种,这表明这种蝙蝠类动物可能代表了一种物种复合体,因此值得进一步的分类重新评估。此外,对该属两栖动物的外部解剖进行了讨论。对固定标本的观察表明,由于四个囊之间的潜在变异性,在个体间比较颈囊长度时应谨慎。
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引用次数: 0
Ecological zonation and phylogeographic structure of Glossina pallidipes (Diptera: Glossinidae) in eastern and southern Africa 非洲东部和南部白翅舌蝇的生态分带和系统地理结构
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-01 DOI: 10.1016/j.ijppaw.2025.101165
Attila J. Trájer , Alex Kummer
Glossina pallidipes, a major vector of African trypanosomiasis, plays a notable role in disease transmission across eastern and southern Africa due to its broad host range, ecological adaptability, and vectorial capacity. This study combined machine learning using 69 environmental, climatic, edaphic, and developmental variables and genetic analysis to delineate the environmental and phylogenetic structuring of G. pallidipes populations. Kernel density estimation revealed three primary hotspots in the Ethiopian and East African Highlands and the Northern Zimbabwe Lowveld, with a secondary focus along the Maasai Steppe. Most occurrences were associated with tropical savanna climates and sparsely populated natural and semi-natural landscapes. Ensemble modelling using five algorithms identified temperature seasonality, precipitation of the coldest quarter, and diurnal temperature range as the strongest predictors of occurrence, highlighting the dominant influence of thermal variability over precipitation metrics. Among developmental factors, larviposition and mortality rates during the dry quarter were most influential, reflecting the role of humidity in reproductive success. K-means Clustering revealed three ecologically distinct groups following an east–west gradient, shaped by elevation, aridity, and thermal variability. Decision tree analysis identified the Köppen Aridity Index and elevation as key discriminators among clusters. Phylogenetic analysis of mitochondrial COI sequences demonstrated clear geographic structuring, with a divergent Ethiopian lineage and high connectivity between Kenyan and Tanzanian populations. Frequent co-occurrence with the African buffalo and the common warthog further supports ecological continuity across savanna mosaics. These results reveal that G. pallidipes populations are primarily structured by climatic gradients and regional connectivity, informing targeted, region-specific vector control strategies.
苍白舌虫是非洲锥虫病的主要媒介,由于其宿主范围广、生态适应性强和媒介能力强,在非洲东部和南部的疾病传播中起着重要作用。本研究将机器学习与69个环境、气候、地理和发育变量以及遗传分析相结合,描绘了苍毛藻种群的环境和系统发育结构。核密度估计揭示了埃塞俄比亚和东非高地以及津巴布韦北部低地的三个主要热点,其次是沿着马赛草原的次要热点。大多数发生与热带稀树草原气候和人口稀少的自然和半自然景观有关。使用五种算法的集合模型确定温度季节性、最冷季度的降水和日温度范围是发生的最强预测因子,突出了热变率对降水指标的主导影响。在发育因素中,旱季的幼虫率和死亡率影响最大,反映了湿度对繁殖成功的作用。K-means聚类揭示了三个生态上不同的类群,它们遵循东西梯度,由海拔、干旱和热变率形成。决策树分析发现Köppen干旱指数和海拔是集群间的关键判别因子。线粒体COI序列的系统发育分析显示了明确的地理结构,具有不同的埃塞俄比亚血统和肯尼亚和坦桑尼亚人群之间的高度连通性。与非洲水牛和普通疣猪的频繁共存进一步支持了热带稀树草原马赛克的生态连续性。这些结果表明,白僵菌种群主要由气候梯度和区域连通性构成,为有针对性的区域特定病媒控制策略提供了信息。
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引用次数: 0
Corrigendum to “Chasing intermediate hosts of Echinococcus multilocularis at the southern edge of its European distribution using red fox stomach content analysis” [Int. J. Parasitol. Parasite. Wildlife 27 (2025) 101095] “利用红狐胃内容物分析在多房棘球蚴欧洲分布的南部边缘追捕其中间宿主”的勘误表[英]。j . Parasitol。寄生虫。野生动物27 (2025)101095]
IF 2.2 3区 医学 Q3 ECOLOGY Pub Date : 2025-12-01 DOI: 10.1016/j.ijppaw.2025.101141
Salvatore Andrea Cafiero , Lucia Cenni , Chiara Rossi , Emily Louise Pascoe , Federica Obber , Graziana Da Rold , Carlo Vittorio Citterio , Adriano Casulli , Heidi Christine Hauffe , Alessandro Massolo
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引用次数: 0
期刊
International Journal for Parasitology-Parasites and Wildlife
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