Manipulation by parasites is a catchy concept that has been applied to a large range of phenotypic alterations brought about by parasites in their hosts. It has, for instance, been suggested that the carotenoid-based colour of acanthocephalan cystacanths is adaptive through increasing the conspicuousness of infected intermediate hosts and, hence, their ...

Manipulation by parasites is a catchy concept that has been applied to a large range of phenotypic alterations brought about by parasites in their hosts. It has, for instance, been suggested that the carotenoid-based colour of acanthocephalan cystacanths is adaptive through increasing the conspicuousness of infected intermediate hosts and, hence, their ...

The acanthocephalan parasite Acanthocephalus dirus develops from the egg to the cystacanth stage inside the freshwater isopod Caecidotea intermedius. We have shown previously that cystacanth-infected male C. intermedius are less likely to initiate mating attempts with females than uninfected males in competitive situations. Here, we ...

Acanthocephalan everted cystacanths were detected in the intestines of 61 out of 555 feral raccoons (Procyon lotor) trapped between May 2003 and April 2005 in the western region of mainland Japan (Honshu). All collected specimens were identified as the species of birds including 3 Centrorhynchus species (C. bazaleticus, C. elongatus, and C. teres), ...

Sexual differences in life history traits, such as size dimorphism, presumably arise via sexual selection and are most readily observed in adults. For complex life-cycle parasites, however, sexual selection may also have consequences for larval traits, e.g., growth in intermediate hosts. Two acanthocephalan species (Acanthocephalus lucii and Echinorhynchus borealis) were ...

The status of bluegill (Lepomis macrochirus) and green sunfish (Lepomis cyanellus) as homologous hosts for the acanthocephalan Neoechinorhynchus cylindratus was experimentally determined. It was found that the adult parasite did not establish in bluegills, but that these fish could serve as paratenic host. In contrast, complete growth and development to the adult stage ...

Cystacanths of Hexaglandula corynosoma were discovered in the fiddler crabs Uca spinicarpa and Uca rapax collected in Mississippi and Florida. Adults were present in yellow-crowned night herons, Nyctanassa violacea, collected in Florida. Cystacanths are very similar to adults, varying only in size and state of development. This is the first record of H. ...

This paper represents the first documentation and description of Pachysentis canicola cystacanths and the first report of a Pachysentis sp. in a paratenic reptile from the Americas. The western diamondback rattlesnake (Crotalus atrox) is also listed as a new host for tetrathyridia of the cyclophyllidean cestode (Mesocestoides sp.) and for the cystacanths ...

Few endoparasite species are pigmented. Acanthocephalans are an exception however, with several species being characterised by yellow to orange colouration both at the immature (cystacanth) and adult stages. However, the functional and adaptive significance of carotenoid-based colourations in acanthocephalans remains unclear. One ...

The degree to which host suitability is a reflection of host community structure in generalist parasites was studied experimentally in the common fish acanthocephalan Leptorhynchoides thecatus. Previous study has shown that green sunfish (Lepomis cyanellus) are required, and largemouth bass (Micropterus salmoides) are suitable (but not required) hosts, where they occur ...

evasive behavior in Gammarus lacustris (Amphipoda) harboring cystacanths of Polymorphus paradoxus acanthocephalan parasite, Pomphorhynchus laevis, in two species of amphipods, Gammarus pulex and Gammarus roeseli; Behavioural modi�cations; Favourisation; Biological invasions; Freshwater Crustacea; Gammarus pulex; Gammarus

of Gammarus lacustris. Nature, London 238, 333. HOLMES, J. C. (1961). Effects of concurrent infections of the Acanthocephala. Co- invasion of Gammarus pulex L. by Echinorhynchus truttae Schrank, 1788 and Polymorphus minutus). Parasite- induced changes in behavior and color make Gammarus pulex more prone to fish predation. Ecology

The pattern of serotonin-like immunoreactivity in the central nervous system of individuals of the amphipod Gammarus lacustris harboring polymorphid cystacanths was compared to the pattern seen in individuals not infected with acanthocephalans. Ventral nerve cords from both parasitized and nonparasitized amphipods showed the same bilateral pair of ...

We examined the effect of isopod size and age on the success of an acanthocephalan infection and on the effects of that infection on the growth and survival of the isopods. Groups of isopods (Asellus aquaticus) belonging to 4 size classes (juveniles, maturing adults, young adults, and older adults) were exposed to infective acanthors of Acanthocephalus lucii. At the end of the ...

Eight common eider (Somateria mollissima) ducklings were experimentally infected from 1 June through 13 June, 1995 with acanthocephalans (Polymorphus minutus) by allowing the birds to feed on Gammarus spp. (Gammarus oceanicus, G. salinus, G. zaddachi, and G. lacustris) containing acanthocephalan cystacanths. Uninfected Gammarus spp. ...

Oligacanthorhynchus nickoli n. sp. (Acanthocephala: Oligacanthorhynchidae) is described from the great-horned owl, Bubo virginianus (Gmelin, 1788) (type host), and red-tailed hawk, Buteojamaicensis (Gmelin, 1788), collected in central Arizona. The new species is most similar to Oligacanthorhynchus iheringi and Oligacanthorhynchus minor, but it differs from all congeners primarily by trunk length, ...

... cystacanth size relates to adult size, green sunfish (Lepomis cyanellus) were fed 10 large or small cystacanths. Fish ... of the resulting adults were compared. Green sunfish (Lepomis cyanellus) that were...

The acanthocephalan parasite Acanthocephalus dirus induces a colour change in the intermediate host, the aquatic isopod Caecidotea intermedius, which increases transmission to definitive hosts (creek chub, sunfish). We examined the potential for conflict to occur between infective (cystacanth) and non-infective (acanthor, acanthella) stages of A. dirus ...

Intermediate host exploitation by parasites is presumably constrained by the need to maintain host viability until transmission occurs. The relationship between parasitism and host survival, though, likely varies as the energetic requirements of parasites change during ontogeny. An experimental infection of an acanthocephalan (Acanthocephalus lucii) in its isopod intermediate ...

Laboratory-reared cystacanths of Leptorhynchoides thecatus (Acanthocephala: Rhadinorhynchidae) were used to study the effect of cystacanth size on adult success and the factors that influence cystacanth size within the intermediate host. To assess how host size and intensity of infection influence cystacanth size, ...

Adults of 2 new species in 2 orders of acanthocephalans obtained from the intestines of terrestrial amphibians and reptiles collected between 1998 and 2004 in Vietnam are described here. Pseudoacanthocephalus nguyenthileae n. sp. (Palaeacnthocephala: Echinorhynchidae) was collected from 5 species of terrestrial amphibians: (1) the common Sunda toad Bufo melanostictus Schneider ...

Leptorhynchoides thecatus (Linton, 1891), an acanthocephalan parasite of freshwater fishes, varies in host use, development, and habitat use throughout North America. Spatial structure of these characteristics was examined from data extracted from the literature. Geographic patterns were inferred from point comparisons using correllograms and then tested with Moran's I ...

Pomphorhynchus laevis, a fish acanthocephalan parasite, manipulates the behaviour of its gammarid intermediate host to increase its trophic transmission to the definitive host. However, the intensity of behavioural manipulation is variable between individual gammarids and between parasite populations. To elucidate causes of this variability, we compared the level of phototaxis ...

The morphology of relaxed cystacanths of polymorphid acanthocephalans collected from notothenioid fishes in the Beagle Channel (Magellanic subregion of sub-Antarctica) is described. A parasite of birds, Andracantha baylisi (Zdzitowiecki, 1986), was found in Patagonotothen longipes and Champsocephalus esox. It has: a proboscis 0.82-0.89 mm long; a proboscis ...

Competitive interactions between coinfecting parasites are expected to be strong when they affect transmission success. When transmission is enhanced by altering host behaviour, intraspecific conflict can lead to 'coinfection exclusion' by the first-in parasite or to a 'sabotage' of behavioural manipulation by the youngest noninfective parasite. We tested these hypotheses in the ...

The parasitism of trahira, Hoplias malabaricus, by the acanthocephalan Quadrigyrus machadoi was studied. Fish were collected at a pond located on Palmeiras Farm (21 degrees 59'19''S, 47 degrees 12'04''W), municipal district of Agua�, S�o Paulo, Brazil, during the period of January, 2002 to May, 2003. Among the 64 specimens analyzed, 56 (prevalence=87.5%) were infected with ...

Two invasive fish species, the round goby Apollonia melanostoma syn. Neogobius melanostomus (Pallas 1814) and the bighead goby Neogobius kessleri (G�nther, 1861), have established a firm population in Austrian waters during the past 15 years. As there have been no records of the parasite fauna from these populations, a total of 79 specimens of A. melanostoma and 12 specimens of N. kessleri were ...

Abstract The helminth community of Tropidurus torquatus (Squamata: Tropiduridae) from a rocky outcrop area located in the state of Minas Gerais, southeastern Brazil, was studied. Ninety-two of the 110 individuals examined (83.6%) harbored helminths. A total of 5 helminth species were found, including 3 nematodes (Physaloptera lutzi, Parapharyngodon bainae, and Oswaldofilaria chabaudi), 1 ...

... Oligacanthorhynchus tortuosa (Oligacanthorhynchidae), an Acanthocephalan of the Virginia Opossum (Didelphis virginiana)Dennis J. RichardsonQuinnipiac University, Campus Box ... ...

... OLIGACANTHORHYNCHID ACANTHOCEPHALAN DESCRIBED FROM THE GREAT HORNED OWL, BUBO VIRGINIANUS (STRIGIDAE), AND RED-TAILED HAWK, BUTEO JAMAICENSIS (ACCIPITRIDAE), ... ...

Cystacanths of Oncicola venezuelensis (Acanthocephala: Oligacanthorhynchidae) were discovered in the hemocoel of Caribbean termites (Nasutitermes acajutlae) on St. Thomas and St. John islands in the U.S. Virgin Islands. In addition to occurring in the insect intermediate host, cystacanths were present in subcutaneous nodules of lizards (Anolis cristatellus ...

... Anolis cristatellus and Anolis stratulus), in the greater omentum of small Indian mongooses (Herpestes auropunctatus), and embedded ... infection Hemocoel (worker termites), subcutaneous nodules (anoles)...

... Abstract : The objective of this study was to compare the intestinal histopathology of common suckers (Catostomus commersoni), creek chubs ...

It was shown that despite fundamental differences in the organization of the tegument of cystacanths and the cyst wall of cysticeroids, they have a number of features similar in localization, morphology, terms of formation, and functional value. These include a powerful outer layer of glycocalyx on the surface of the tegument, filling of the distal department with dense ...

... Ornithology 29:75�79. Zdzitowiecki, K. 1984. Some Antartic acanthocephalans of the genus Corynosoma parasitizing Pinnipedia, with ... 11�24. Zdzitowiecki, K. 1986a. Acanthocephalans of the Antartic. Acta ...

The objective of this study was to compare the intestinal histopathology of common suckers (Catostomus commersoni), creek chubs (Semotilus atromaculatus) and walleyes (Stizostedion vitreum) infected with acanthocephalans. Special emphasis was placed on th...

Examination of 1905 arthropods from a swamp and surrounding pasture in sothern Louisiana revealed larval specimens of Mediorhynchus centurorum in 8 of 228 woodroaches, Parcoblatta pensylvanica, but in no other species. The life cycle was confirmed by feeding eggs of M. centurorum to laboratory-reared woodroaches. Cystacanths later recovered from the woodroaches developed into ...

... larva cystacantha (Acanthocephala) de la cavidad general de Chasmagnathus granulata Dana, 1851 Ciclo evolutivo y descripción de Falsificollis chasmagnathi ... ...

... Infestations by A. jacksoni in brook trout, Salvelinus fontinalis, in the Atlantic salmon, Salmo salar, the rainbow trout. S. gairdneri, and ...

Acanthocephalan parasites of the species Plagiorhynchus (Prosthorhynchus) formosus Van Cleave, 1918, were recovered from the intestinal tracts of two male and two female wild Western Bluebirds (Sialia mexicana). Parasitism by P. formosus was considered to be a contributory cause of death of these breeding adult bluebirds. This is the first reported recovery of ...

Morphology of capsules surrounding acanthocephalan Corynosoma strumosum in paratenic hosts (sea fishes of three species from the northern part of the Sea of Okhotsk) was studied. A thick layer of glycocalyx is formed on the surface of acanthocephalan's tegument in smelts Osmerus mordax dentex and Hypomesus olidus; the surrounding capsule is formed by ...

Amphipods of Diporeia spp. have declined considerably during the last decade in the Great Lakes. We examined the possibility that disease may be affecting these populations. A histological survey assessed the parasites in species of Diporeia within Lakes Huron and Michigan, USA, and the host response to some of them and to unknown factors. Amphipods were found to have an intranuclear inclusion ...

... C.M. Shilton, R. Shine. (2006) Do parasites matter? Assessing the fitness consequences of haemogregarine infection in snakes. ... ...

... D. Mazzi, and S. Zala. 1997. Parasite-induced changes in behaviour and color make Gammarus pulex more prone to fish predation. ... ...

... is regarded as the principal definitive host and Micropterus salmoides Lacepède, 1802 (largemouth bass), and Ambloplites rupestris Rafinesque, ... and development of Leptorhynchoides thecatus in largemout...

... Kinsella. (2007) Intestinal Helminths of the Spotted Sandpiper, Actitis macularius (L.), During Fall Migration in New Brunswick, Canada, ... ...

... populations of other acanthocephalan species such as Pomphorhynchus leavis Müller 1776, and Leptorhynchoides thecathus Linton, 1891, which ... ...

... H. Zhu, and D. M. Hillis. 1998. Best-fit maximum-likelihood models for phylogenetic inference: Empirical tests with known ... ...

... specimens of U. rapax and 1 of Uca thayeri (n = 22) harbored acanthellae. None of 48 Uca ... ...

common species of helminths par- asitic in trout, Salmo trutta. In the acanthocephalan Echinorhynchus commonly found in trout, Salmo trutta, in northern Italy: the acanthocephalans Pomphorhynchus laevis of worms from four species of helminth parasites in trout, Salmo trutta. Values are partial regression

... Analysis of Metals in Acanthocephalans Using Energy Dispersive X-Ray Analysis (EDXA) in Conjunction with a Scanning Electron ... mail: omaramin@aol.com) Abstract Using energy-dispersive x-ray analysis (...

in Gammarus lacustris (Amphipoda) harboring cystacanths of Polymor- phus paradoxus (Acanthocephala behaviour induced by the parasite Polymor- phus paradoxus (Acanthocephala) in Gammarus lacustris (Crustacea/1615-9861(200209)2:9) Maynard, B. J., DeMartini, L. & Wright, W. G. 1996 Gammarus lacustris harboring Polymorphus paradoxus show

Abstract In acanthocephalans, dispersal typically occurs when eggs that have been released in the intestines of definitive hosts are expelled with the feces. We examined whether the acanthocephalan Acanthocephalus dirus adopts a strategy of dispersal in which eggs are carried into the environment by gravid females. Using a combination of field surveys and ...

... molecules such as parasite haptens. For DESS, increased membrane permeability results in NaCl and EDTA transport into cells ( ... The procedure we used takes advantage of the membrane permeability of DMSO ...

... Goldberg et al., 1997), Sceloporus magister (Telford, 1970), Sceloporus occidentalis (Gambino, 1957; Gambino and Heyneman, 1960; Telford, 1970), ... al., 1996), S. magister (Pearce and Tanner, 1973), Scel...

by the acanthocephalan Polymorphus paradoxus in Gammarus lacustris (Helluy & Holmes 1990); injections of octopamine and the clinging behaviour induced by the parasite Polymorphus paradoxus (Acanthocephala) in Gammarus lacustris architecture in the brain of Gammarus insensibilis (Crustacea: Amphipoda) S. Helluy1* and F. Thomas2 1

A total of 11,875 crustaceans of 2 species, Pontoporeia affinis (Lindstrom) (Amphipoda) and Mysis relicta (Loven) (Mysidacea) from bottom samples as well as from the stomachs of slimy sculpins, Cottus cognatus Richardson, was dissected in search of certai...

... Polymorphidae by their long cylindrical trunk with anterior swelling, pyriform proboscis with hooks much larger ventrally, brain ... hooks considerably larger than rootless dorsal hooks at swelling; poste...

The acanthocephalan subfamily Plagiohynchinae is reviewed. Prosthorhynchus Kostylew, 1915 is synonymized with Plagiorhynchus Luhe, 1911. Plagiorhynchus subg. n. and Prosthorhynchus subg. n. are proposed within the genus Plagiorhynchus. A report is made on...

... largest, posterior hook smallest. Neck short. Proboscis and neck enveloped in a double-layered membrane (Figs. 15, 18). Proboscis receptacle with strong double walls and brain at its middle. Lemnisci subeq...

... within outer nonmuscular protrusors originating at base of neck and inserting at various points on receptacle; brain at middle of its internal ventral surface (Fig. ... ...

... Lake Biwa, Lake Ogura (since drained), and the Yodo River (type locality), all part of the Lake Biwa/Yodo River drainage system (Yamaguti 1935). The hosts reported ... ...

Eight species of parasitic helminths, one acanthocephalan, four cestodes, one trematode, one nematode, and one leech species, are reported from various hosts: Acanthocephalus parksidei is reported from 12 host species with 10 new hosts records; first reco...

... shorter lemniscus 2,950 long by 325 wide. Reproductive system in posterior half of trunk. Testes oblong, contiguous. ... 550 (2780) long by 416�551 (503) wide. Reproductive system hidden by eggs. Eggs ovo...

... EXHIBITED BY LEPTORHYNCHOIDES THECATUS (ACANTHOCEPHALA) IN GREEN SUNFISH (LEPOMIS CYANELLUS)Dennis J. Richardson* and Brent B. NickolSchool of ... 1974). The acanthocephalan Leptorhynchoides thecatus and ...

://edis.ifas.ufl.edu/FA005 UF/IFAS Circular 920 Ichthyophthirius multifiliis (White Spot) Infections in Fish. http

... bigueti. The proportions of the elements of the female genital complex of the 2 species are also different ( ... as related to the significance of placement of female genital pore, egg membranes, and host ...

... and Michael A. Bargerb aDepartment of Biology and Health Services, 150 Cooper Hall, ... using colon contents, stomach contents, and feces. Infection rates were ... ...

, Culaea inconstans (Os- teichthyes, Gasterosteidae). Ethology 99:234�242. CSADA, R. D., P. C. JAMES, AND R

Distribution of Leptorhynchoides thecatus (Acanthocephala: Rhadinorhynchidae) among the pyloric caeca and the relationship between site and rate of maturation were studied in laboratory infections of 10, 25 and 40 cystacanths fed to green sunfish, Lepomis cyanellus. After 1 week fish fed at each intensity had significantly different numbers of worms. By the 3rd week ...

Concentrations of the elements As, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, Sn, V, Zn were analysed by inductively coupled plasma mass spectrometry (ICP-MS) in the acanthocephalan Pomphorhynchus laevis and its fish host Barbus barbus. A total of 27 barbels were collected from the Danube River in autumn 2006 close to the town Kozloduy (685 river kilometer) on the Bulgarian river bank. ...

Patterns of host use by parasites throughout a guild community of intermediate hosts can depend on several biological and ecological factors, including physiology, morphology, immunology, and behavior. We looked at parasite transmission in the intertidal crustacean community of Lower Portobello Bay, Dunedin, New Zealand, with the intent of: (1) mapping the flow of parasites throughout the major ...

Vertical distribution of acanthocephalans of the order Echinorhynchida is studied in Lake Baikal. Four species and subspecies from cottid fishes (Perciformes: Cottoidei) were examined, namely Pseudoechinorhynchus borealis (Linstow, 1901), Metechinorhynchus salmonis salmonis (Muller, 1780), M.s. baicalensis Bogolepova, 1957, M. truttae (Schrank, 1788). In the littoral (0-5 m) ...

The integument of the acanthocephalans Echinorhynchus gadi, Acanthocephalus lucii, Polymorphus minutus and Macracanthorhynchus hirudinaceus have been investigated by stereoscan and transmission electron microscopy. The absorptive surface is considerably increased by invaginations of the outer plasma membrane (pore canals and vesicles). The rate of this enlargement has been ...

Two species of anurans from Colombia, South America, Atelopus spurrelli and Dendrobates histrionicus, were examined for helminths. A. spurrelli was found to harbor three species of Nematoda, adults of Cosmocerca podicipinus and larvae of Physocephalus sp. and Porrocaecum sp. D. histrionicus was found to harbor, in addition to C. podicipinus, Physocephalus sp. and Porrocaecum sp. and ...