The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Wanchai Maleewong - One of the best experts on this subject based on the ideXlab platform.
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growth and development of gnathostoma spinigerum nematoda gnathostomatidae larvae in mesocyclops aspericornis cyclopoida Cyclopidae
Parasites & Vectors, 2011Co-Authors: Penchom Janwan, Luxkhana Sadaow, Oranuch Sanpool, Tongjit Thanchomnang, Wanchai MaleewongAbstract:Background Gnathostoma spinigerum larva is pathogenic, causing gnathostomiasis in humans and certain animals, and is prevalent mainly in Asia. Growth and development of Gnathostoma spinigerum larvae in the cyclopoid copepod Mesocyclops aspericornis, the first intermediate host, were examined.
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growth and development of gnathostoma spinigerum nematoda gnathostomatidae larvae in mesocyclops aspericornis cyclopoida Cyclopidae
Parasites & Vectors, 2011Co-Authors: Penchom Janwan, Luxkhana Sadaow, Oranuch Sanpool, Tongjit Thanchomnang, Pewpan M Intapan, Wanchai MaleewongAbstract:Gnathostoma spinigerum larva is pathogenic, causing gnathostomiasis in humans and certain animals, and is prevalent mainly in Asia. Growth and development of Gnathostoma spinigerum larvae in the cyclopoid copepod Mesocyclops aspericornis, the first intermediate host, were examined. When newly hatched, ensheathed second-stage larvae (L2) were ingested by M. aspericornis, they immediately appeared exsheathed in the stomach of M. aspericornis. They then penetrated the stomach wall and entered the body cavity, where they immediately metamorphosed to a stunted form with the body length/width ratio equal to the early third-stage larvae (EL3) up to 2 h after being ingested. During metamorphosis, the anterior spine-like structure of L2 transformed into unequal transparent lips. The larvae moulted into EL3 in the body cavity of the copepod at around day 5-7 post-infection. Minute cuticular striations were seen on the whole body, with prominent single-pointed spines on the anterior part of the body. The head bulb had four rows of hooklets and two lateral trilobed lips. The size of EL3 in copepods continuously increased towards day 12 and showed a negative correlation to their density per copepod (R = -0.881, P < 0.05 for body length, and R = -0.906, P < 0.05 for body width). The results revealed for the first time that M. aspericornis, one of the most abundant freshwater copepods in Thailand, is a suitable first intermediate host for G. spinigerum. High susceptibility of M. aspericornis suggests its importance for the maintenance of the life cycle of G. spinigerum in Thailand.
Tongjit Thanchomnang - One of the best experts on this subject based on the ideXlab platform.
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growth and development of gnathostoma spinigerum nematoda gnathostomatidae larvae in mesocyclops aspericornis cyclopoida Cyclopidae
Parasites & Vectors, 2011Co-Authors: Penchom Janwan, Luxkhana Sadaow, Oranuch Sanpool, Tongjit Thanchomnang, Wanchai MaleewongAbstract:Background Gnathostoma spinigerum larva is pathogenic, causing gnathostomiasis in humans and certain animals, and is prevalent mainly in Asia. Growth and development of Gnathostoma spinigerum larvae in the cyclopoid copepod Mesocyclops aspericornis, the first intermediate host, were examined.
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growth and development of gnathostoma spinigerum nematoda gnathostomatidae larvae in mesocyclops aspericornis cyclopoida Cyclopidae
Parasites & Vectors, 2011Co-Authors: Penchom Janwan, Luxkhana Sadaow, Oranuch Sanpool, Tongjit Thanchomnang, Pewpan M Intapan, Wanchai MaleewongAbstract:Gnathostoma spinigerum larva is pathogenic, causing gnathostomiasis in humans and certain animals, and is prevalent mainly in Asia. Growth and development of Gnathostoma spinigerum larvae in the cyclopoid copepod Mesocyclops aspericornis, the first intermediate host, were examined. When newly hatched, ensheathed second-stage larvae (L2) were ingested by M. aspericornis, they immediately appeared exsheathed in the stomach of M. aspericornis. They then penetrated the stomach wall and entered the body cavity, where they immediately metamorphosed to a stunted form with the body length/width ratio equal to the early third-stage larvae (EL3) up to 2 h after being ingested. During metamorphosis, the anterior spine-like structure of L2 transformed into unequal transparent lips. The larvae moulted into EL3 in the body cavity of the copepod at around day 5-7 post-infection. Minute cuticular striations were seen on the whole body, with prominent single-pointed spines on the anterior part of the body. The head bulb had four rows of hooklets and two lateral trilobed lips. The size of EL3 in copepods continuously increased towards day 12 and showed a negative correlation to their density per copepod (R = -0.881, P < 0.05 for body length, and R = -0.906, P < 0.05 for body width). The results revealed for the first time that M. aspericornis, one of the most abundant freshwater copepods in Thailand, is a suitable first intermediate host for G. spinigerum. High susceptibility of M. aspericornis suggests its importance for the maintenance of the life cycle of G. spinigerum in Thailand.
Penchom Janwan - One of the best experts on this subject based on the ideXlab platform.
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growth and development of gnathostoma spinigerum nematoda gnathostomatidae larvae in mesocyclops aspericornis cyclopoida Cyclopidae
Parasites & Vectors, 2011Co-Authors: Penchom Janwan, Luxkhana Sadaow, Oranuch Sanpool, Tongjit Thanchomnang, Wanchai MaleewongAbstract:Background Gnathostoma spinigerum larva is pathogenic, causing gnathostomiasis in humans and certain animals, and is prevalent mainly in Asia. Growth and development of Gnathostoma spinigerum larvae in the cyclopoid copepod Mesocyclops aspericornis, the first intermediate host, were examined.
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growth and development of gnathostoma spinigerum nematoda gnathostomatidae larvae in mesocyclops aspericornis cyclopoida Cyclopidae
Parasites & Vectors, 2011Co-Authors: Penchom Janwan, Luxkhana Sadaow, Oranuch Sanpool, Tongjit Thanchomnang, Pewpan M Intapan, Wanchai MaleewongAbstract:Gnathostoma spinigerum larva is pathogenic, causing gnathostomiasis in humans and certain animals, and is prevalent mainly in Asia. Growth and development of Gnathostoma spinigerum larvae in the cyclopoid copepod Mesocyclops aspericornis, the first intermediate host, were examined. When newly hatched, ensheathed second-stage larvae (L2) were ingested by M. aspericornis, they immediately appeared exsheathed in the stomach of M. aspericornis. They then penetrated the stomach wall and entered the body cavity, where they immediately metamorphosed to a stunted form with the body length/width ratio equal to the early third-stage larvae (EL3) up to 2 h after being ingested. During metamorphosis, the anterior spine-like structure of L2 transformed into unequal transparent lips. The larvae moulted into EL3 in the body cavity of the copepod at around day 5-7 post-infection. Minute cuticular striations were seen on the whole body, with prominent single-pointed spines on the anterior part of the body. The head bulb had four rows of hooklets and two lateral trilobed lips. The size of EL3 in copepods continuously increased towards day 12 and showed a negative correlation to their density per copepod (R = -0.881, P < 0.05 for body length, and R = -0.906, P < 0.05 for body width). The results revealed for the first time that M. aspericornis, one of the most abundant freshwater copepods in Thailand, is a suitable first intermediate host for G. spinigerum. High susceptibility of M. aspericornis suggests its importance for the maintenance of the life cycle of G. spinigerum in Thailand.
Geoffrey A Boxshall - One of the best experts on this subject based on the ideXlab platform.
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antennulary development during the copepodid phase in the family Cyclopidae copepoda cyclopoida
Zoosystema, 2000Co-Authors: Maria Luisa Motta Schutze, Carlos Eduardo Falavigna Da Rocha, Geoffrey A BoxshallAbstract:Le developpement des antennules des copepodites temelles dans la ramille aes Cyclopidae a ete etudie chez 35 especes appartenant a 29 genres des sous-familles Euryteinae, Halicyclopinae, Eucyclopinae et Cyclopinae. L'homologie des articles antennulaires a ete etablie en comparant l'arrangement des soies de chaque article avec la presence d'elements d'ornementation reconnus ici comme marqueurs. Dix modeles de developpement ont ete denombres. Le modele le plus frequent concerne les antennules avec 11 a 17 articles chez les femelles adultes. Ce modele a ete trouve chez Cyclops sp., Megacyclops viridis s.l., Acanthocyclops sp., Mesocyclops meridianus, Thermocyclops decipiens, Kieferiella delamarei, Macrocyclops albidus albidus, Troglocyclops janstocki, Diacyclops biscupidatus odessanus, D. uruguayensis, Metacyclops laticornis, M. hirsutus, Microcyclops anceps anceps, M. ceibaensis, M. alius, Apocyclops dengizicus, Hesperocyclops stocki, Speocyclops racovitzai Graeteriella (Graeteriella) brehmi, Bryocyclops caroli, Muscocyclops operculatus et Fimbricyclops jimhensoni. Le deuxieme modele est trouve chez Tropocyclops schubarti schubarti, Cryptocyclops linjanticus et Apocyclops procerus. Le troisieme modele reunit Allocyclops silvaticus et Neutrocyclops sp. Des modeles uniques de developpement ont ete respectivement trouves chez Afrocyclops gibsoni, Ancheuryte notabilis, Eucyclops (Eucyclops) ensifer, Neocyclops (Neocyclops) vicinus, Paracyclops chiltoni, Halicyclops aberrans et en deux especes de Ectocyclops (E. strenzkei et E. rubescens). Apres la mue en copepodite I, de nouveaux articles se forment seulement dans les regions mediane et proximale de l'antennule. Une augmentation du nombre d'articles due a l'expression des nouvelles articulations entre les articles a souvent ete observee pendant l'ontogenie des antennules. Une reduction du nombre d'articles se produit dans certaines lignees phylogenetiques du fait de l'echec de l'expression d'articulations entre les articles, mais la fusion de segments precedemment separes n'a jamais ete observee chez les femelles. Huit especes de Cyclopinae et une d'Halicyclopinae presentent des antennules neoteniques. Les informations sur le developpement des antennules sont tres importantes comme source de nouveaux caracteres pour la reconstruction phylogenetique chez les Cyclopidae.
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two new species of paracyclops copepoda cyclopoida Cyclopidae from africa
Hydrobiologia, 1998Co-Authors: Suphan Karaytug, Danielle Defaye, Geoffrey A BoxshallAbstract:Paracyclops longispina n. sp. and Paracyclops altissimus n. sp. are described. New characters derived from detailed examination of body and limb ornamentation are used to differentiate them from other Paracyclops species. Paracyclops longispina n. sp. resembles Paracyclops fimbriatus (Fischer, 1853) and Paracyclops imminutus Kiefer, 1929. It differs from the former by the presence of a well-developed spinular row near the base of the inner setae on the antennal coxobasis in both sexes, and from the latter in the structure of the seminal receptacle and the position of the mid-distal spinular row on the posterior surface of the coxa of leg 1. Paracyclops altissimus n. sp. can be distinguished from other members of genus mainly by the structure of the seminal receptacle and leg 5.
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the female antennules of paracyclops cyclopoida Cyclopidae their significance for systematics
Journal of Marine Systems, 1998Co-Authors: Geoffrey A Boxshall, Suphan KaraytugAbstract:The setation patterns of female antennules of some Paracyclops species are analysed with reference to the hypothetical 28-segmented antennule of ancestral copepod proposed by Huys and Boxshall in 1991. Comparison between Paracyclops species has revealed a setation pattern common to all species thus far examined. Several modifications of the female antennules have been identified as apomorphic states and can be used in phylogenetic studies. P. waiariki has 12-segmented antennules and exhibits more plesiomorphic characters than the reduced 8-segmented antennules of other species, such as P. fimbriatus. The results confirm that simple segment numbers are unusable as characters in cladistic analysis. Both P. affinis and P. yeatmani, for example, have 11-segmented antennules but analysis of segmental homologies has revealed that the 11-segmented state is convergent in these two species.
Jaimie T. A. Dick - One of the best experts on this subject based on the ideXlab platform.
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The Effect of the Alternative Prey, Paramecium caudatum (Peniculida: Parameciidae), on the Predation of Culex pipiens (Diptera: Culicidae) by the Copepods Macrocyclops albidus and Megacyclops viridis (Cyclopoida: Cyclopidae).
Journal of medical entomology, 2018Co-Authors: Ross N. Cuthbert, Amanda Callaghan, Jaimie T. A. DickAbstract:Biological control can be an effective tool to combat public health risks associated with mosquito-borne disease. However, target impacts of biological control agents may be reduced by biotic contexts such as the presence of alternative prey. In turn, this can impede our ability to realistically assess biocontrol agent efficacy. Here, we examine the effects of alternative ciliate prey on the predation potential of two cyclopoid copepods, Macrocyclops albidus Jurine (Cyclopoida: Cyclopidae) and Megacyclops viridis Jurine (Cyclopoida: Cyclopidae), toward larvae of the West Nile virus vector mosquito Culex pipiens Linnaeus (Diptera: Culicidae). Using functional responses (FRs; resource use under different resource densities), we demonstrate that both copepods exhibit potentially destabilizing type II FRs toward mosquito prey. However, where the alternative prey was present, we observed species-specific modulations to FR form and magnitude. For M. albidus, FRs remained type II where ciliate prey were present, however, maximum feeding rates on mosquito larvae were reduced. Conversely, for M. viridis, FRs moved toward more stabilizing type III, while maximum feeding rates on mosquito larvae were not significantly reduced. While both species of cyclopoid copepod were able to effectively target and consume larval mosquitoes in the presence of alternative prey, we demonstrate that overall efficacies may be reduced in aquatic habitats which contain multiple prey types. We thus advocate that biotic contexts such as prey selectivity should be integrated into predatory biocontrol agent examinations for mosquitoes which vector pathogens and parasites, to more holistically assess their efficacy.
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biological control agent selection under environmental change using functional responses abundances and fecundities the relative control potential rcp metric
Biological Control, 2018Co-Authors: Ross N. Cuthbert, Amanda Callaghan, Jaimie T. A. Dick, James W E DickeyAbstract:Abstract We currently lack the capacity to rapidly and reliably predict the efficacy of biological control agents due to inadequate consistency in derivations of functional and numerical responses and potential effects of context-dependencies. Here, we propose and apply a novel metric, Relative Control Potential (RCP), which combines the functional response (FR, per capita effect) with proxies for the numerical response (NR, agent population response) to compare agent efficacies, where RCP = FR × abundance (or other proxies e.g. fecundity). The RCP metric is a comparative ratio between potential biocontrol agents, where values > 1 indicate higher relative control efficacy. Further, RCP can compare the efficacy of agents under environmental contexts, such as temperature change. We thus derived the RCP for two predatory cyclopoid copepods, Macrocyclops albidus (Cyclopoida: Cyclopidae) and Megacyclops viridis (Cyclopoida: Cyclopidae), towards larvae of the mosquito Culex pipiens (Diptera: Culicidae) under temperatures representative of current and future climate. Both copepods exhibited potentially population destabilising Type II FRs, with increasing temperatures inducing greater magnitude FRs through increased attack rates and decreased handling times. Attack rates by M. albidus were higher than M. viridis, yet handling times and maximum feeding rates were similar between the species across all temperatures. The inclusion of abundance data drives an elevated RCP of M. albidus and the integration of fecundity drives greater RCP of M. albidus at peak temperatures. Q10 values are indicative of increased feeding activity by both copepods with temperature increases, however relative feeding level increases of M. viridis slowed towards the peak temperature. We present RCP calculations and biplots that represent the comparative efficacies of the two biological control agents across temperatures. The Relative Control Potential (RCP) metric thus provides a new tool for practitioners to better assess the potential efficacy of biocontrol agents before their integration into management approaches for pests, vectors and invasive species.
