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  • 1
    Online Resource
    Online Resource
    The Art of Being a Parasite. (2005)
    Chicago :University of Chicago Press,
    Details
    Keywords: Parasites. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (298 pages)
    Edition: 1st ed.
    ISBN: 9780226778723
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6220035
    DDC: 577.8/57
    Language: English
    Note: Intro -- Introduction: What Is a Symbiosis? -- Arms Races -- How Does One Become a Parasite? -- The Profession of Parasite -- The Profession of Host -- The Profession of Mutualist -- Alice and the Red Queen -- Sexual Selection and Parasitism -- Parasites in Space and Time -- Emerging Diseases and the Future Arms Race -- Notes -- Glossary -- References -- Index.
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  • 2
    Electronic Resource
    Electronic Resource
    Can host body size explain the parasite species richness in tropical freshwater fishes? (1992)
    Springer
    Oecologia 90 (1992), S. 197-204 
    Details
    ISSN: 1432-1939
    Keywords: Species richness ; Parasite communities ; Freshwater fish ; Body size ; West Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The variability of monogenean gill ectoparasite species richness in 19 West African cyprinid species was analyzed using the following seven predictor variables: host size, number of drainage basins, number of sympatric cyprinid species, host diversity, association with mainland forest, host ecology, and monogenean biological labelling. The size of the host species accounted for 77% of the variation in the number of parasite species per host, and host ecology an additional 8%. Together the effects of host size and host ecology accounted for 85% of the variation in monogenean species richness. This study shows that the deciding factors for explaining monogenean species richness in West African cyprinid fishes are host species size and host ecology. These results were compared with main factors responsible for parasite species richness in fish communities. Other possible explanations of monogenean community structure in west African cyprinids are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317176
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Genetic analysis of cercarial emergence rhythms ofSchistosoma mansoni (1988)
    Springer
    Behavior genetics 18 (1988), S. 201-209 
    Details
    ISSN: 1573-3297
    Keywords: Parasitology ; Schistosoma mansoni ; cercarial shedding behavior ; emergence rhythms ; crossbreeding ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Using two chronobiological variants ofSchistosoma mansoni (a blood fluke infecting man) from Guadeloupe (French West Indies), we carried out experimental crossbreeding between schistosomes with an early and those with a late cercarial shedding pattern. The results obtained on the F1 (intermediate shedding patterns) and F2 generations (early, intermediate, and late patterns) demonstrate that the cercarial emergence rhythms of schistosomes are genetically determined. This genetic variability is interpreted as a consequence of the selective pressure exerted by the two different hosts (man and rat) implicated in the life cycle ofS. mansoni from the Guadeloupean focus of schistosomiasis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01067842
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of photoreceptors ofpolystoma integerrimum (platyhelminths, monogenea) (1978)
    Springer
    Zoomorphology 91 (1978), S. 147-155 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The structure of the eyespots of the free-swimming larva ofPolystoma integerrimum (Monogenea, Polystomatidae) was studied by electron microscopy. Each eyespot is rhabdomeric in type, with one cup-shaped supportive cell and one sensory cell. The supportive cell is characterized by concentric rows of platelets, separated by 120 nm. This entirely new structure in a platyhelminth acts like a concave mirror of a telescope in concentrating the light. Moreover, at each interface of lamellae of platelets, light is amplified. InPolystoma, the light concentration occurs by reflection whereas it occurs by refraction in all other platyhelminths studied up to now. Among the monogenean Trematodes, all the Polystomatidae appear to present this reflecting system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00993858
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  • 5
    Electronic Resource
    Electronic Resource
    Le processus de résorption ovocytaire chez les Polystomes à ovaire double (1970)
    Springer
    Parasitology research 33 (1970), S. 262-266 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Summary The study made on sections of a Polystoma having one extra ovary allows to prove that this ovary is not connected with the outside and that all the ovocytes which have grown there are resorbed in the marginal area of the ovary.
    Notes: Résumé L'étude sur coupes sériées d'un Polystome possédant un ovaire supplémentaire permet de prouver que celui-ci ne possède aucune relation avec l'extérieur et que tous les ovocytes produits subissent une résorption dans la paroi de l'organe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00259496
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  • 6
    Electronic Resource
    Electronic Resource
    Morphologie de l'oncomiracidium dePolystomoïdes Ward, 1917 (Monogenea) et situation du genre parmi les Polystomatidae (1978)
    Springer
    Parasitology research 56 (1978), S. 175-181 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'oncomiracidium dePolystomoïdes Ward, 1917 parasite de Chéloniens, s'apparente par de nombreux caractères morphologiques (cellules ciliées, chétotaxie, armature du hapteur), mais aussi par la biologie de l'hôte, au genreProtopolystoma parasite deXenopus. Ces mêmes caractères les différencient des autres Polystomatidae d'Amphibiens (Polystoma etEupolystoma).
    Notes: Summary We describe the haptoral sclerites, ciliated cells and chetotaxy of the oncomiracidium ofPolystomoïdes collected in the gullet of freshwater Chelonia (Clemis caspica var.leprosa) from the Tunis areas. When we compare the oncomiracidia of the presently known Polystomatidae, i.e.Polystoma, Eupolystoma, Protopolystoma andPolystomoïdes, the following basic features are revealed: Ciliated cell pattern: there are a total of 55 cells (including 1 apical, and 12 haptoral) inPolystoma andEupolystoma; and 64 cells (including 2 apical and 16 haptoral) inProtopolystoma andPolystomoïdes. Haptor: Rudiments of one pair of hamuli are identified inPolystoma andEupolystoma, butProtopolystoma andPolystomoïdes show two pairs. A further correlative aspects of their biology confirms both resemblances betweenPolystoma andEupolystoma on the one hand, andProtopolystoma andPolystomoïdes on the other hand; the former are parasites of amphibian hosts, the latter of fundamentally aquatic ones. There is no correlation with their hosts sincePolystomoïdes is a parasite of Chelonia, andPolystoma, Eupolystoma andProtopolystoma are parasites of Amphibia. TheProtopolystoma, parasites ofXenopus, are more related to thePolystomoïdes, parasites of Chelonia than to all the other Polystomatidae from Amphibia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930748
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  • 7
    Electronic Resource
    Electronic Resource
    Biologie des Polystomatidae: Le cycle interne direct chez Eupolystoma alluaudi (de Beauchamp, 1913) (1973)
    Springer
    Parasitology research 42 (1973), S. 69-75 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Summary Eupolystoma alluaudi, a parasite of Bufo regularis Reuss, 1834, was recently found in Togo. Its cycle comprises a reproduction inside the bladder of the adult toad, the swimming larvae being capable of developing without leaving the host. This direct internal cycle is evinced by: high densities of parasitism contrasting with low frequences, the observation, inside the same bladder, of parasites at every stage of development, the fact that the laying and the hatching of the egg are nearly simultaneous. The importance of this process in the subsistence of parasitism seems essential, and its significance in the context of the cycle of Platyhelminths is questioned.
    Abstract: Zusammenfassung Eupolystoma alluaudi, in Bufo regularis Reuss, 1834, schmarotzend, wurde in Togo wiederentdeckt. Die Art vermehrt sich in der Harnblase der erwachsenen Kröte, dabei entwickeln sich die schwimmenden Larven ohne den Wirt zu verlassen. Die Beobachtung von Individuen in allen Entwicklungsstadien in derselben Harnblase, die enorme Zahl von Parasiten bei einem sehr geringen Prozentsatz infizierter Wirte, sowie die sofort nach der Eiablage schlüpfenden Larven beweisen diesen direkten internen Zyklus. Die Wichtigkeit dieser Erscheinung bei der Erhaltung des Schmarotzertums wird hervorgehoben und seine Bedeutung in Rahmen der Plathelminthen-Zyklen erörtert.
    Notes: Résumé Eupolystoma alluaudi, parasite de Bufo regularis Reuss, 1834, a été retrouvé au Togo. Son cycle comporte une reproduction dans la vessie du crapaud adulte, les larves nageantes étant capables d'évoluer sans quitter l'hôte. Ce cycle interne direct est attesté: par les densités considérables du parasitisme contrastant avec des fréquences faibles, par l'observation, dans une même vessie, d'individus à tous les stades de développement, par la quasi-simultanéité de la ponte de l'oeuf et de son éclosion. L'importance de ce processus dans le maintien du parasitisme apparaît comme essentiel et sa signification dans le contexte des cycles de Plathelminthes est discutée.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329012
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  • 8
    Electronic Resource
    Electronic Resource
    Recherches sur le cycle biologique d'Euryhelmis squamula (Rudolphi, 1819) parasite de Neomys fodiens dans les Pyrénées (1974)
    Springer
    Parasitology research 44 (1974), S. 81-92 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Le premier hôte de E. squamula dans les Pyrénées est le Mollusque Prosobranche Bythinella reyniesii; les cercaires sont du type parapleurolophocerque et présentent deux ocelles dorsaux; elles s'enkystent dans le tissu souscutané des Grenouilles (mais non des têtards); les métacercaires sont entourées d'un kyste réactionnel important et deviennent infestantes à l'âge de deux mois; l'hôte définitif est l'Insectivore Neomys fodiens. Dans la nature, il s'avère que la prévalence et la densité des métacercaires sont maximales au-dessus de 2 000 mètres. La cercaire décrite dans ce travail présentant des différences morphologiques importantes (présence des ocelles) avec la cercaire décrite aux U.S.A. comme celle d'E. squamula, le problème de l'identification d'E. squamula en Amérique est discuté.
    Notes: Summary The first host of E. squamula in the Pyrenees is the Prosobranchia Mollusc Bythinella reyniesii; the cercariae belong to the parapleurolophocerca group and have two eyespots on the back; they encyst under the skin of frogs (but not of tadpoles); the metacercariae are surrounded by an important reactive cyst and become infecting at the age of two months; the definitive host is the Insectivora Neomys fodiens. In nature, the frequency and the intensity of the metacercariae reach their highest level above 6000 feet. As the cercaria described here is fairly different (due to the existence of eyespots) from the cercaria described in the U.S. under the name of E. squamula, the problem raised by the identification of E. squamula in America is debated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328834
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  • 9
    Electronic Resource
    Electronic Resource
    Parasites, biodiversity and ecosystem stability (1996)
    Springer
    Biodiversity and conservation 5 (1996), S. 953-962 
    Details
    ISSN: 1572-9710
    Keywords: biodiversity ; hybrid zones ; outcome of competition ; parasites ; stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: The influence of parasites in ecosystems, especially on biodiversity, is discussed. Various examples illustrate the role that parasites play in the outcome of interspecific competition, in the success of invading species, and in the separation of emerging species. Parasites can be stabilizers or destabilizers, depending on factors such as susceptibility of hosts and size of the ecosystem. Parasites play a major role each time ‘something’ disturbs living beings at the populational and/or specific level, as they do at the individual level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054413
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