Metazoan parasite species richness and genetic variation among freshwater fish species: cause or consequence?

Poulin, Robert; Marshall, Leigh J.; Spencer, Hamish G.

doi:10.1016/s0020-7519(00)00047-3

Cited by 22 publications

(15 citation statements)

References 45 publications

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“…The all-female clonal populations could also be classified as vulnerable, since antigen recognition and killing by T-cells is genetically restricted by the major histocompatibility complex (MHC) (Somamoto et al 2009). Lower tolerance to parasites has been reported in gynogens (Lively et al 1990, Moritz et al 1991, Poulin et al 2000, Hakoyama et al 2001.…”

Section: Introductionmentioning

confidence: 93%

Massive mortality of Prussian carp Carassius gibelio in the upper Elbe basin associated with herpesviral hematopoietic necrosis (CyHV-2)

Daněk¹,

Kalous²,

Veselý³

et al. 2012

Dis. Aquat. Org.

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From 22 May to 10 June 2011 massive mortality of Prussian carp Carassius gibelio was observed in alluvial Lake Ř ehačka close to the Elbe River in the Czech Republic. More than 1400 kg of dead fish were collected and no other fish species were affected. Further molecular and cytogenetic investigation of fish (n = 232) revealed that the Ř ehačka population of Prussian carp consisted exclusively of gynogenetic triploid females. The causative agent was identified by means of molecular and electron microscopy as a herpesviral hematopoietic necrosis virus (Cyprinid herpes virus 2, CyHV-2). This is the first report of CyHV-2 from the Czech Republic and the second finding worldwide of CyHV-2 causing mass mortality of C. gi be lio. Some other localities in the upper Elbe River basin where C. gibelio was affected are also noted. We assume that the massive wave of deaths of all female gynogenetic Prussian carp can be attributed to limited genetic variation and the favourable conditions for development of viral disease. KEY WORDS: Cypriniformes · Herpesvirus · Triploid · Gynogenetic · MortalityResale or republication not permitted without written consent of the publisher

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Section: Introductionmentioning

confidence: 93%

Massive mortality of Prussian carp Carassius gibelio in the upper Elbe basin associated with herpesviral hematopoietic necrosis (CyHV-2)

Daněk¹,

Kalous²,

Veselý³

et al. 2012

Dis. Aquat. Org.

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“…However, this approach has to our knowledge never been applied to phenotypic traits implied in the encounter probability between hosts and parasites (Combes 1998). The possibility of reciprocal eVects of host's traits linked to the encounter rate and parasite infection seems highly probable given that genetic parameters and other intrinsic parameters, such as age, sex or hormonal levels of the host, have been found to inXuence infection probabilities (Paterson et al 1998;Poulin 1998;Poulin et al 2000;Krasnov et al 2005;Seivwright et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Why do parasitized hosts look different? Resolving the “chicken-egg” dilemma

et al. 2009

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Phenotypic differences between infected and non-infected hosts are often assumed to be the consequence of parasite infection. However, pre-existing differences in hosts' phenotypes may promote differential susceptibility to infection. The phenotypic variability observed within the host population may therefore be a cause rather than a consequence of infection. In this study, we aimed at disentangling the causes and the consequences of parasite infection by calculating the value of a phenotypic trait (i.e., the growth rate) of the hosts both before and after infection occurred. That procedure was applied to two natural systems of host-parasite interactions. In the first system, the infection level of an ectoparasite (Tracheliastes polycolpus) decreases the growth rate of its fish host (the rostrum dace, Leuciscus leuciscus). Reciprocally, this same phenotypic trait before infection modulated the future level of host sensitivity to the direct pathogenic effect of the parasite, namely the level of fin degradation. In the second model, causes and consequences linked the growth rate of the fish host (the rainbow smelt, Osmerus mordax) and the level of endoparasite infection (Proteocephalus tetrastomus). Indeed, the host's growth rate before infection determined the number of parasites later in life, and the parasite biovolume then decreased the host's growth rate of heavily infected hosts. We demonstrated that reciprocal effects between host phenotypes and parasite infection can occur simultaneously in the wild, and that the observed variation in the host phenotype population was not necessarily a consequence of parasite infection. Disentangling the causality of host-parasite interactions should contribute substantially to evaluating the role of parasites in ecological and evolutionary processes.

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“…The Ligophorus/Mugilidae specificity suggests that this is an association that results from a long coevolutionary process Suriano 1977, Marchiori et al 2015). In addition, studies have shown that long coevolutionary relationships can influence pathogenicity of the parasite, which certainly reflects selection processes of the host populations (Poulin et al 2000). Other authors showed this phenomena, even in high prevalence and intensity of infestation by Ligophorus spp.…”

Section: Species Of Ligophorusmentioning

confidence: 96%

Moderate pathogenic effect of Ligophorus uruguayense (Monogenoidea, Ancyrocephalidae) in juvenile mullet Mugil liza (Actinopterygii, Mugilidae) from Brazil

Pahor-Filho

Klosterhoff

Marchiori

et al. 2017

An. Acad. Bras. Ciênc.

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Monogenoidea pathogenic activity can elicit various histological responses in fish. Species of Ligophorus are specific parasites of mullets, and its relationship with host fish may result in a moderate pathogenic action. In order to ascertain this relationship, estuarine mullets (Mugil liza) were collected in an estuary, reared in laboratory, for three weeks, and forwarded for histological and parasitological analyses. Ligophorus uruguayense (Monogenoidea) infestation in the gills of the mullets was identified. The severe infestation by only one species of Monogenoidea may result from the specificity of these parasites to mullets. Mullets submitted to histological analysis exhibited respiratory epithelium detachment; mild, moderate and severe hyperplasia of the respiratory epithelium; atrophy; and telangiectasia of the gills. This is the first study reporting that mullets highly infested by Monogenoidea can show mild (100%) to severe (20%) gill changes with a distinct frequency of occurrence. Because of the high prevalence of mild alterations observed, it is possible to accept that L. uruguayense is moderately pathogenic to M. liza, even during high prevalence and intensity of infestation, as a result of its specificity.

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Metazoan parasite species richness and genetic variation among freshwater fish species: cause or consequence?

Cited by 22 publications

References 45 publications

Massive mortality of Prussian carp Carassius gibelio in the upper Elbe basin associated with herpesviral hematopoietic necrosis (CyHV-2)

Massive mortality of Prussian carp Carassius gibelio in the upper Elbe basin associated with herpesviral hematopoietic necrosis (CyHV-2)

Why do parasitized hosts look different? Resolving the “chicken-egg” dilemma

Moderate pathogenic effect of Ligophorus uruguayense (Monogenoidea, Ancyrocephalidae) in juvenile mullet Mugil liza (Actinopterygii, Mugilidae) from Brazil

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