Éditeur(s) : Lipsiae : apud Frid. Fleischer in comm.
Extrait de : Flora brasiliensis. Volumen IV. Pars II (après index)
Résumé : Plante parasite, famille des Balanophoraceae

Permalien : http://www.manioc.org/images/TLS17067-0207i1
TLS17067-0207i1

Éditeur(s) : Lipsiae : apud Frid. Fleischer in comm.
Extrait de : Flora brasiliensis. Volumen IV. Pars II (après index)
Résumé : Plante parasite, famille des Balanophoraceae
Fig. 1-11. Flores masculi ; 12-15. Flores feminei ; 16-21. Fructus.

Permalien : http://www.manioc.org/images/TLS17067-0193i1
TLS17067-0193i1

Éditeur(s) : Lipsiae : apud Frid. Fleischer in comm.
Extrait de : Flora brasiliensis. Volumen IV. Pars II (après index)
Résumé : Plante parasite, famille des Balanophoraceae

Permalien : http://www.manioc.org/images/TLS17067-0189i1
TLS17067-0189i1

Éditeur(s) : Lipsiae : apud Frid. Fleischer in comm.
Extrait de : Flora brasiliensis. Volumen IV. Pars II (après index)
Résumé : Plante parasite, famille des Balanophoraceae

Permalien : http://www.manioc.org/images/TLS17067-0219i1
TLS17067-0219i1

Extrait de : La Guyane française : notes et souvenirs d'un voyage exécuté en 1862-1863 (p.287)
Siècle(s) traité(s) : 19
Droits : Domaine public
Provenance : Université des Antilles et de la Guyane. Service commun de la documentation
Permalien : http://www.manioc.org/images/HASH01c9c69b0ffe950cd027e3a0
HASH01c9c69b0ffe950cd027e3a0

Extrait de : La Guyane française : notes et souvenirs d'un voyage exécuté en 1862-1863 (p.289)
Siècle(s) traité(s) : 19
Droits : Domaine public
Provenance : Université des Antilles et de la Guyane. Service commun de la documentation
Permalien : http://www.manioc.org/images/HASH014a96e5144da746e75fae85
HASH014a96e5144da746e75fae85

Éditeur(s) : HAL CCSD Oxford University Press (OUP)
Résumé : International audience
This study describes the structure of the digestive gland of Strombus gigas in individuals from Guadeloupe and discusses the function of its cell types and their relationship with intracellular Apicomplexa-like parasites. Three cellular types were found in the epithelium of the blind-ending tubules of the digestive gland according to histological and transmission electron microscopy (TEM) observations; these were: digestive cells, pyramidal crypt cells and vacuolated cells. Columnar digestive cells were characterized by large Alcian blue-positive granules, which have not been previously described in digestive cells of other caenogastropods. Such granules contain large quantities of proteoglycans that are exported to the stomach through the physiological destruction of the digestive cells, which undergo a holocrine secretion. Their cytoplasm appears vacuolar due to lipid extraction by solvents used for tissue preparation. Vacuolated cells also appear to be lipid-storage cells. Small triangular-shaped crypt cells, on the other hand, appear to be metabolically active as suggested by a strong positive in situ hybridization of eukaryotic ribosomes, which was confirmed by their large content of ribosomes and rough endoplasmic reticulum compared to the other cell types. These observations suggest that crypt cells may be immature cells that are involved in the replacement of eliminated digestive cells. However, their spherocrystal inclusions indicate that they may be excretory cells or calcium cells. Large brown inclusions were frequently observed in vacuolated cells; these were identified as parasitic protozoans and were present in the digestive gland of all sampled specimens. These protozoans have previously been described from a queen conch population in the San Andres Archipelago (Colombia). Several life cycle stages of the parasite were identified by scanning electron microscopy and TEM; trophozoites were characterized by their conoid-like structure, sporocysts by their thick walls, and gamonts by their thin walls. These observations suggest that this parasite completes its entire life cycle within the same host and type of tissue. Although previous investigations place this parasite within the Apicomplexa group, further investigations are necessary in order to confirm the identification of the parasite.
ISSN: 0260-1230

hal-00755287
https://hal.univ-antilles.fr/hal-00755287
DOI : 10.1093/mollus/eyn041

Extrait de : Deux années au Brésil (P.189)
Résumé : Vignette montrant une femme tentant d'extraire des tiques du pied d'un homme à la lueur d'une bougie
Siècle(s) traité(s) : 19
Droits : Domaine public
Provenance : Université des Antilles et de la Guyane. Service commun de la documentation
Permalien : http://www.manioc.org/images/HASH8a513a42ca9edcb8697b2a
HASH8a513a42ca9edcb8697b2a

Extrait de : La Guyane française : notes et souvenirs d'un voyage exécuté en 1862-1863 (p.293)
Siècle(s) traité(s) : 19
Droits : Domaine public
Provenance : Université des Antilles et de la Guyane. Service commun de la documentation
Permalien : http://www.manioc.org/images/HASH018bb59f8f7f373f1787fe9a
HASH018bb59f8f7f373f1787fe9a

Éditeur(s) : Lipsiae : apud Frid. Fleischer in comm.
Extrait de : Flora brasiliensis. Volumen IV. Pars II (après index)
Résumé : Plante parasite, famille des Balanophoraceae
Fig. 1. var. brasiliensis. Fig. 2-8. Flores masculi ; 9-18. Flores feminei ; 19-24. Fructus.

Permalien : http://www.manioc.org/images/TLS17067-0197i1
TLS17067-0197i1

Éditeur(s) : HAL CCSD Cambridge University Press (CUP)
Résumé : International audience
We studied the monogenean communities of 34 species of butterflyfish from the tropical Indo-West Pacific, identifying 13 dactylogyrid species (including two species that are presently undescribed). Monogenean assemblages differed significantly between host species in terms of taxonomic structure, intensity and prevalence. Parasite richness ranged from 0 (Chaetodon lunulatus) to 11 (C. auriga, C. citrinellus and C. lunula). Host specificity varied between the dactylogyrids species, being found on 2-29 of the 34 chaetodontid species examined. Sympatric butterflyfish species were typically parasitized by different combinations of dactylogyrid species, suggesting the existence of complex host-parasite interactions. We identified six clusters of butterflyfish species based on the similarities of their dactylogyrid communities. Dactylogyrid richness and diversity were not related to host size, diet specialization, depth range or phylogeny of butterflyfish species. However, there was a weak positive correlation between monogenean richness and diversity and host geographical range. Most communities of dactylogyrids were dominated by Haliotrema aurigae and H. angelopterum, indicating the importance of the genus Haliotrema in shaping monogenean communities of butterflyfishes. This study casts light on the structure of the monogenean communities of butterflyfishes, suggesting that the diversity and complexity of community structures arises from a combination of host species-specific parameters.
ISSN: 0031-1820

hal-01380679
https://hal-univ-perp.archives-ouvertes.fr/hal-01380679
DOI : 10.1017/S0031182016001463

Extrait de : La Guyane française : notes et souvenirs d'un voyage exécuté en 1862-1863 (p.288)
Siècle(s) traité(s) : 19
Droits : Domaine public
Provenance : Université des Antilles et de la Guyane. Service commun de la documentation
Permalien : http://www.manioc.org/images/HASH01d765fa605f22d0bbbce49e
HASH01d765fa605f22d0bbbce49e

Éditeur(s) : HAL CCSD Instituto Oswaldo Cruz, Ministério da Saúde
Résumé : International audience
Leishmania are protozoan parasites that show remarkable diversity, as revealed by the various clinical forms of leishmaniasis, which can range from mild skin lesions to severe metastatic cutaneous/mucosal lesions. The exact nature and extent of Leishmania phenotypic diversity in establishing infection is not fully understood. In order to try to understand some aspects of this diversity, we subcutaneously infected BALB/c mice with first and second generation subclones of a L. amazonensis strain isolated from a patient (BA125) and examined in vivo lesion growth rate and antimony susceptibility. In vivo fast-, medium- and slow-growing subclones were obtained; moreover, fast-growing subclones could generate slow-growing subclones and inversely, revealing the continuous generation of diversity after passage into mice. No antimony-resistant subclone appeared, probably a rare occurrence. By tagging subclone cells with a L. amazonensis genomic cosmid library, we found that only a very small number of founding cells could produce lesions. Leishmania clones transfected with in vivo selected individual cosmids were also diverse in terms of lesion growth rate, revealing the cosmid-independent intrinsic characteristics of each clone. Our results suggest that only a few of the infecting parasites are able to grow and produce lesions; later, within the cell mixture of each lesion, there coexist several parasite populations with different potentialities to grow lesions during the next infection round. This may reflect a sort of programmed heterogeneity of individual parasites, favoring the survival of some individuals in various environmental conditions.
ISSN: 0074-0276

hal-01489008
https://hal-univ-perp.archives-ouvertes.fr/hal-01489008

Éditeur(s) : Apud Frid. Fleischer in comm
Extrait de : Flora brasiliensis. Volumen I. Pars I (après l'index de la deuxième partie)
Résumé : Parasites des grands arbres, dans la province de Rio de Janeiro
Tab. physiognom XIII.
Siècle(s) traité(s) : 19
Permalien : http://www.manioc.org/images/TLS17055-0255i1
TLS17055-0255i1

Éditeur(s) : HAL CCSD Instituto Oswaldo Cruz, Ministério da Saúde
Résumé : International audience
Leishmania are protozoan parasites that show remarkable diversity, as revealed by the various clinical forms of leishmaniasis,which can range from mild skin lesions to severe metastatic cutaneous/mucosal lesions. The exact nature andextent of Leishmania phenotypic diversity in establishing infection is not fully understood. In order to try to understandsome aspects of this diversity, we subcutaneously infected BALB/c mice with first and second generation subclones of aL. amazonensis strain isolated from a patient (BA125) and examined in vivo lesion growth rate and antimony susceptibility.In vivo fast-, medium- and slow-growing subclones were obtained; moreover, fast-growing subclones could generateslow-growing subclones and inversely, revealing the continuous generation of diversity after passage into mice. Noantimony-resistant subclone appeared, probably a rare occurrence. By tagging subclone cells with a L. amazonensisgenomic cosmid library, we found that only a very small number of founding cells could produce lesions. Leishmaniaclones transfected with in vivo selected individual cosmids were also diverse in terms of lesion growth rate, revealing thecosmid-independent intrinsic characteristics of each clone. Our results suggest that only a few of the infecting parasitesare able to grow and produce lesions; later, within the cell mixture of each lesion, there coexist several parasite populationswith different potentialities to grow lesions during the next infection round. This may reflect a sort of programmedheterogeneity of individual parasites, favoring the survival of some individuals in various environmental conditions.
ISSN: 0074-0276

hal-01557855
https://hal-univ-perp.archives-ouvertes.fr/hal-01557855
DOI : 10.1590/0074-02760160280

Éditeur(s) : Lipsiae : apud Frid. Fleischer in comm.
Extrait de : Flora brasiliensis. Volumen IV. Pars II (après index)
Résumé : Plante parasite, famille des Balanophoraceae

Permalien : http://www.manioc.org/images/TLS17067-0205i1
TLS17067-0205i1

Éditeur(s) : Aquaculture 67 : 260-261
Résumé : An infection caused by a Perkinsus -like parasite has been observed in Ruditapes decussatus from Portugal (Comps and Chagot, 1987). Following a pathological study carried out on clams affected by mortalities in the Algarve area, this parasite was found again, inducing a reaction process in the host. Histological examination reveals the parasite in the connective tissue of different organs. The adjoining tissues, particularly the epithelia, are not affected.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/1987/acte-3109.pdf
http://archimer.ifremer.fr/doc/00000/3109/

Éditeur(s) : Conseil International pour l'Exploration de la Mer (CIEM), C. M. 1975/K: 21
Résumé : Following our aim of developing oyster culture in French Guyana and studying the different options available to increase a stock of new oyster species, we were lead to search for possible parasites in Crassostrea rhizophorae. These oysters from the French Guyanese coasts host some gregarine Nematopsis sp. spores, characterized by Comps, Grizel and Tige (1972). Through this work, we conducted some experimental infestation trials between Crassostrea rhizophorae spats parasited by these spores and the most common crab on metropolitan farms Carcinus maenas.
Poursuivant les objectifs de développement de l'ostréiculture en Guyane et étudiant les possibilités d'accroissement d'un stock constitué de nouvelles espèces d'huîtres, nous avons été amenés à rechercher d'éventuels parasites chez Crassostrea rhizophorae. Ces huîtres des côtes de la Guyane française abritent des spores de Grégarines, Nematopsis sp. mises en évidence par COMPS, GRIZEL et TIGE (1972). Au cours de ce travail nous avons réalisé des essais d'infestations expérimentales entre du naissain de Crassostrea rhizophorae parasité par ces spores et le crabe le plus répandu sur les parcs à huîtres métropolitains, Carcinus maenas.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/1975/acte-6290.PDF
http://archimer.ifremer.fr/doc/00000/6290/

Éditeur(s) : HAL CCSD Wiley
Résumé : International audience
While the effects of deforestation and habitat fragmentation on parasite prevalence or richness are well investigated, host-parasite networks are still understudied despite their importance in understanding the mechanisms of these major disturbances. Because fragmentation may negatively impact species occupancy, abundance and co-occurrence, we predict a link between spatiotemporal changes in habitat and the architecture of host-parasite networks. For this, we used an extensive data set on 16 rodent species and 29 helminth species from seven localities of South-East Asia. We analysed the effects of rapid deforestation on connectance and modularity of helminth-parasite networks. We estimated both the degree of fragmentation and the rate of deforestation through the development of land uses and their changes through the last 20 to 30years in order to take into account the dynamics of habitat fragmentation in our statistical analyses. We found that rapid fragmentation does not affect helminth species richness per se but impacts host-parasite interactions as the rodent-helminth network becomes less connected and more modular. Our results suggest that parasite sharing among host species may become more difficult to maintain with the increase of habitat disturbance.
ISSN: 0021-8790

hal-01355307
https://hal.archives-ouvertes.fr/hal-01355307
DOI : 10.1111/1365-2656.12368
IRD : fdi:010064927

Éditeur(s) : HAL CCSD Public Library of Science
Résumé : International audience
IntroductionLeishmania RNA virus type 1 (LRV1) is an endosymbiont of some Leishmania (Vianna) species in South America. Presence of LRV1 in parasites exacerbates disease severity in animal models and humans, related to a disproportioned innate immune response, and is correlated with drug treatment failures in humans. Although the virus was identified decades ago, its genomic diversity has been overlooked until now.Methodology/Principles findingsWe subjected LRV1 strains from 19 L. (V.) guyanensis and one L. (V.) braziliensis isolates obtained from cutaneous leishmaniasis samples identified throughout French Guiana with next-generation sequencing and de novo sequence assembly. We generated and analyzed 24 unique LRV1 sequences over their full-length coding regions. Multiple alignment of these new sequences revealed variability (0.5%±23.5%) across the entire sequence except for highly conserved motifs within the 5' untranslated region. Phylogenetic analyses showed that viral genomes of L. (V.) guyanensis grouped into five distinct clusters. They further showed a species-dependent clustering between viral genomes of L. (V.) guyanensis and L. (V.) braziliensis, confirming a long-term co-evolutionary history. Noteworthy, we identified cases of multiple LRV1 infections in three of the 20 Leishmania isolates.Conclusions/SignificanceHere, we present the first-ever estimate of LRV1 genomic diversity that exists in Leishmania (V.) guyanensis parasites. Genetic characterization and phylogenetic analyses of these viruses has shed light on their evolutionary relationships. To our knowledge, this study is also the first to report cases of multiple LRV1 infections in some parasites. Finally, this work has made it possible to develop molecular tools for adequate identification and genotyping of LRV1 strains for diagnostic purposes. Given the suspected worsening role of LRV1 infection in the pathogenesis of human leishmaniasis, these data have a major impact from a clinical viewpoint and for the management of Leishmania-infected patients.
ISSN: 1935-2727

pasteur-01583523
https://hal-riip.archives-ouvertes.fr/pasteur-01583523
DOI : 10.1371/journal.pntd.0005764
PUBMED : 28715422