scholarly journals Endohelminths in Cichla piquiti(Perciformes, Cichlidae) from the Paraná River, São Paulo State, Brazil

2013 ◽  
Vol 22 (4) ◽  
pp. 475-484 ◽  
Author(s):  
Lidiane Franceschini ◽  
Aline Cristina Zago ◽  
Maria Conceição Zocoller-Seno ◽  
Rosicleire Veríssimo-Silveira ◽  
Alexandre Ninhaus-Silveira ◽  
...  
Keyword(s):  
Parasite Species ◽  
Paraná River ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
New Host ◽  
Parana River ◽  
Third Stage ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Host Parasite

Fifty specimens of Cichla piquiti were collected from the Paraná River downstream of the Ilha Solteira Hydroelectric Power Station in Brazil and surveyed for endohelminth parasites. All fish were parasitised by at least one helminth species (overall prevalence [P] = 100%). Eight parasite taxa were present: the nematode Procamallanus(Procamallanus) peraccuratus in the intestines; third-stage larvae of the anisakids Contracaecumsp. and Hysterothylacium sp. in the visceral cavity, mesentery and serosa of the stomach and intestines and on the liver and spleen; the trematodes Austrodiplostomum compactum in the eye (metacercariae) and Genarchella genarchella in the stomach; and the cestodes Proteocephalus macrophallus, Proteocephalus microscopicus, and Sciadocephalus megalodiscus in the intestines. Hysterothylaciumsp. larvae (P = 86%) and P. microscopicus (P = 74%) were the most prevalent parasites. Anisakids were more prevalent and abundant in the dry season. A negative correlation between the abundances of Hysterothylacium sp. and P. microscopicuswas observed, suggesting a competitive/antagonistic relationship between these parasites. Cichla piquiti represents a new host for four parasite species. These new records significantly increase the list of parasites of C. piquiti, contributing to the knowledge of the host-parasite relationship and the geographical distribution of these helminths.

scholarly journals Helminths of freshwater fishes in the reservoir of the Hydroelectric Power Station of Itaipu, Paraná, Brazil

Check List ◽  
2011 ◽  
Vol 7 (5) ◽  
pp. 681 ◽  
Author(s):  
Anna Kohn ◽  
Frantisek Moravec ◽  
Simone C. Cohen ◽  
Carla Canzi ◽  
Ricardo M. Takemoto ◽  
...  
Keyword(s):  
Freshwater Fishes ◽  
Paraná River ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
New Host ◽  
Parana River ◽  
Upper Paraná River ◽  
Host Parasite ◽  
New Host Records

This study presents results from several expeditions in 1985, 1991-1995 and 2003 to the Medium Paraná River in the section that begins below the Itaipu Dam and ends at the trinational border of Brazil, Argentina and Paraguay, in the lotic and lentic zones of the reservoir of the Hydroelectric Power Station of “Itaipu Binacional” (localities Foz do Iguaçu, Santa Helena and Guaira). Ninety-eight species of freshwater fishes belonging to 22 families were examined for helminths. A host-parasite list based on Acanthocephala, Cestoda, Digenea, Monogenea and Nematoda collected from the region in question is provided. New host records are presented for Digenea and Nematoda. The Monogenea and Acanthocephala are being studied and will be published in a later paper, but are referred in the host-parasite list, in order to demonstrate the parasitism in the fishes of the reservoir. The results are compared with those presented by other authors from the Upper Paraná River. 

The age and sex of the host as factors affecting the host–parasite relationship of the third-stage larva of Amplicaecum robertsi Sprent & Mines, 1960, in the laboratory mouse

Parasitology ◽  
1966 ◽  
Vol 56 (3) ◽  
pp. 399-406 ◽  
Author(s):  
Colin Dobson
Keyword(s):  
Laboratory Mouse ◽  
Suckling Mouse ◽  
Factors Affecting ◽  
Third Stage ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
The One ◽  
Host Parasite ◽  
Relationship Of ◽  
Old Mice

There was no difference between the worm burdens or the lengths of the worms recovered from sexually immature male and female mice infected with Amplicaecum robertsi.In mice older than 70 days there were fewer larvae recovered from the female than the male host. The larvae were also longer in the male than in the female mouse.The suckling mouse harboured fewer larvae than the weanling; the susceptibility of the mouse continued to increase with increasing age until the one-hundredth day in the males and the seventy-fifth day in the females. In animals older than this an age resistance was apparent. It is suggested that the much lower susceptibility of the suckling mouse is due to the small gut and villi size reducing the establishment of the larvae.Worm growth also varied with host age, the longest larvae being recovered from the suckling mice and successively smaller worms from each older age group up to the seventy-fifth day, beyond which there was no significant change in worm growth with age of the host. There was no difference between the worm burdens and the lengths of the worms recovered from 90-day-old mice. The injection of testosterone had little or no effect on the host–parasite relationship of gonad-ectomized animals. Larvae from gonadectomized mice were significantly shorter than those from the intact hosts.

Behavioural fever in infected honeybees: parasitic manipulation or coincidental benefit?

Parasitology ◽  
2010 ◽  
Vol 137 (10) ◽  
pp. 1487-1491 ◽  
Author(s):  
JENNIFER CAMPBELL ◽  
BETH KESSLER ◽  
CHRISTOPHER MAYACK ◽  
DHRUBA NAUG
Keyword(s):  
Behavioural Change ◽  
Temperature Sensitive ◽  
The Novel ◽  
New Host ◽  
Proximate Mechanisms ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Novel Host ◽  
Host Parasite ◽  
Rule Out

SUMMARYInfection by a parasite often induces behavioural changes in the host and these changes may benefit either the host or the parasite. However, whether these changes are active host defence mechanisms or parasitic manipulations or simply incidental byproducts of the infection is not always clear. It has been suggested that understanding the proximate mechanisms of these changes as well as comparative studies could help distinguish these alternatives better. Behavioural fever is a common response to an infection in many animals and we investigated the phenomenon in the novel host-parasite relationship between the honeybee and the temperature-sensitive microsporidian Nosema ceranae. Our results show that infected bees prefer higher temperatures and even though this seems to benefit the pathogen, the proximate mechanism underlying this change is the pathological stress underlying the infection. Especially because it is a new host-parasite relationship, it is best to label the observed behavioural change as a case of incidental benefit although this does not rule out selection acting on it. We discuss the importance of looking at the behavioural outcomes of host-parasite relationships and the importance of studying them at multiple levels for understanding their origin and maintenance.

The host-parasite relationship in pregnant cattle infected with Neospora caninum

Parasitology ◽  
2007 ◽  
Vol 134 (13) ◽  
pp. 1903-1910 ◽  
Author(s):  
ELISABETH A. INNES
Keyword(s):  
Immune Responses ◽  
Neospora Caninum ◽  
Clinical Signs ◽  
Protozoan Parasite ◽  
First Trimester ◽  
Disease Pathogenesis ◽  
New Host ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Host Parasite

SUMMARYThe protozoan parasite Neospora caninum is an important cause of reproductive disease in cattle worldwide. The dog is a definitive host for the parasite and the oocyst stage, shed in the faeces, is a source of infection for cattle through consumption of contaminated feed or water. In addition, transplacental transmission of N. caninum is a very efficient means of the parasite infecting a new host and this can occur in successive pregnancies and over several generations. Neospora parasites may cause disease during pregnancy resulting in death of the foetus or birth of live congenitally infected calves that may show some neurological clinical signs at birth. The stage of pregnancy at which infection/parasitaemia occurs is an important factor in determining disease severity. Neospora infection in the first trimester of pregnancy may have more severe consequences for the foetus compared with infection occurring in the final trimester. The host-parasite relationship during pregnancy is a fascinating interaction and research in this area will improve understanding of disease pathogenesis and the various consequences of the host immune response, being host-protective, parasite protective and contributing to disease pathology. Pregnancy poses an interesting problem for the immune system of the dam as she is essentially carrying a semi-allogeneic tissue graft (the foetus) without immunological rejection taking place. To facilitate the pregnancy the cytokine environment in the placenta favours the regulatory Th-2-type cytokines, whose role is to counteract the pro-inflammatory Th1-type immune responses. Protective immunity to N. caninum, similar to many other intracellular parasites, involves Th1-type immune responses, which may pose problems for the dam trying to control a Neospora infection during pregnancy.This paper will discuss the host-parasite relationship at different stages of gestation in pregnant cattle and review the implications of this research for our understanding of disease pathogenesis, parasite transmission and host protection.

Leptospira interrogans serovar hardjo in pigs: a new host-parasite relationship in the United Kingdom

1983 ◽  
Vol 113 (7) ◽  
pp. 153-154 ◽  
Author(s):  
S. Hathaway ◽  
W. Ellis ◽  
T. Little ◽  
A. Stevens ◽  
H. Ferguson
Keyword(s):  
United Kingdom ◽  
Leptospira Interrogans ◽  
New Host ◽  
The United Kingdom ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Host Parasite

scholarly journals Parasitism by Monogenoidea in Piaractus mesopotamicus (Characiformes, Characidae) cultivated in Paraná River (Brazil)

2017 ◽  
Vol 77 (4) ◽  
pp. 787-793 ◽  
Author(s):  
M. S. L. Leão ◽  
M. C. N. Justo ◽  
G. W. Bueno ◽  
S. C. Cohen ◽  
S. C. São Clemente
Keyword(s):  
Distribution Pattern ◽  
Paraná River ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
Piaractus Mesopotamicus ◽  
Mean Intensity ◽  
Parana River ◽  
Total Length ◽  
Parasite Distribution

Abstract This study investigated the occurrence, prevalence, mean abundance and mean intensity of monogenoidean parasites in Piaractus mesopotamicus farmed in cages in the reservoir of the Itaipu Hydroelectric Power Station, Paraná River, Brazil. The parasite distribution pattern and the correlation of prevalence and abundance with the total length of hosts were also investigated. Four monogenoidean species were collected: Anacanthorus penilabiatus, A. toledoensis, Mymarothecium ianwhitingtoni and M. viatorum. All the parasites collected in P. mesopotamicus showed the typical aggregated distribution pattern, and the abundance and the prevalence did not shown any correlation with the total length of hosts.

scholarly journals Aphelenchoides bicaudatus from Ornamental Nurseries in Taiwan and Its Relationship with Some Agricultural Crops

Plant Disease ◽  
2012 ◽  
Vol 96 (12) ◽  
pp. 1763-1766 ◽  
Author(s):  
Fan-Yu Jen ◽  
Tung-Tsuan Tsay ◽  
Peichen Chen
Keyword(s):  
Gene Sequence ◽  
Pure Line ◽  
Agricultural Crops ◽  
New Host ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Planting Materials ◽  
Host Parasite ◽  
Relationship Of ◽  
Bird’S Nest Fern

Aphelenchoides bicaudatus nematodes were identified in planting materials and water samples from 35 floral ornamental nurseries in Taiwan. A pure line of the nematode was established from the bulk samples collected, and the nematode was identified as A. bicaudatus on the basis of morphometric data and the 18S gene sequence (GU984233). Host range tests were conducted by inoculating A. bicaudatus onto Phalaenopsis spp. strawberry, rice, bird's-nest fern, cyclamen, dendrobium, African violet, and saxifrage (all reported hosts of A. besseyi). Symptoms did not develop during the 4 weeks following inoculation. However, after staining, both eggs and nematodes inside plant tissue of Phalaenopsis roots, strawberry leaf buds, and rice sheath indicated that A. bicaudatus had established in these hosts. These results revealed a potential new host–parasite relationship of A. bicaudatus, and suggest that this nematode may infect these economically important hosts.

Redescription of Rhipidocotyle jeffersoni (Kohn, 1970) Overstreet & Curran, 2002 (Digenea: Bucephalidae)

Zootaxa ◽  
2006 ◽  
Vol 1193 (1) ◽  
pp. 41-47
Author(s):  
ANNA KOHN ◽  
BERENICE M.M. FERNANDES
Keyword(s):  
Paraná River ◽  
Morphological Data ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
Type Host ◽  
Parana River ◽  
Salminus Brasiliensis

Rhipidocotyle jeffersoni (Kohn, 1970) Overstreet & Curran, 2002 is redescribed, based on the holotype and on additional specimens from the intestine of the type-host Salminus brasiliensis (= S. maxillosus) (Characidae), collected at different dates and from several localities of the Paraná River and the hydroelectric power station reservoir of Itaipu, Paraná State, Brazil. Rhipidocotyle jeffersoni is compared with all other species in the genus to confirm its validity. New morphological data, such as different positions of the ovary, testes and caeca, and the extent of the uterus are presented and considered to be specific variations.

Sign in / Sign up

Export Citation Format

Share Document