Impact of a fungal parasite on the reproductive potential of the freshwater calanoid <i>Eudiaptomus intermedius</i>

Rossetti, Giampaolo; Fratta, Elena; Tireni, Francesca; Viglioli, Simona

doi:10.1080/03680770.2001.11902610

Cited by 4 publications

(13 citation statements)

References 17 publications

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“…In deep water bodies adults overwinter under the ice cover and start to reproduce at the spring thaw. In permanent, oligotrophic habitats the reproductive period usually lasts until July, although in some years a second generation, sustained by scarce ovigerous females, may appear in autumn (as in the Santo Parmense and Scuro Parmense in 1999); this cohort most probably does not survive under the ice cover (Rossetti et al 2002). In shallower or more productive permanent water bodies, more generations per year were observed (e.g., Buono and Palude del Verde).…”

Section: Resultsmentioning

confidence: 99%

“…Systematic research on zooplankton communities started in the 1950s . Since then, several papers on calanoid copepods inhabiting this area have been published: Ferrari & Ascolini (1975), Ascolini et al (1979) and Rossetti et al (1995Rossetti et al ( , 2002 described the life cycle of E. intermedius in two oligotrophic lakes; the genetic variability and the reproductive biology of populations of M. kupelwieseri have been investigated by Rossi et al (1995Rossi et al ( , 1998.…”

Section: Introductionmentioning

confidence: 99%

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Distribution and ecology of calanoid species in relation to morphometric and chemical characteristics of lakes and ponds of the Northern Apennines (Italy)

Tavernini¹,

Fratta²,

Sartore³

et al. 2003

J Limnol

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distribution and ecology of calanoid species in relation to morphometric and chemical characteristics of lakes and ponds of the Northern Apennines (Italy)

Tavernini¹,

Fratta²,

Sartore³

et al. 2003

J Limnol

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“…The following consistencies were observed in the infection process occurring at Lake Scuro Parmense in 1992-1994and 1998(Rossetti et al, 2002:…”

Section: Characteristics Of the Fungal Infection In E Intermediusmentioning

confidence: 86%

“…The phenology of the fungal infection was described for the population of E. intermedius of Lake Scuro Parmense by Rossetti et al (2002) from samples collected weekly or fortnightly in the open-water season of 4 years. In that study, the presence of the same parasite was also occasionally reported in other 4 populations of E. intermedius sampled in Northern Apennine water bodies (Gemio Superiore, Gemio Inferiore, Ballano and Verdarolo) out of a total of 26 ( Table 1).…”

Section: Characteristics Of the Fungal Infection In E Intermediusmentioning

confidence: 99%

“…This is the report of the results of a study on a parasitic fungus found in populations of the calanoid copepod Eudiaptomus intermedius (Steuer, 1897) inhabiting Northern Apennine lakes (Italy). The host-parasite dynamics in one of these lakes was previously described by Rossetti et al (2002) on the basis of four-year observations. So far, there have been few documented accounts of freshwater calanoids affected by fungal parasites, and all of these are circumscribed to three genera: Boeckella in New Zealand (Burns, 1980(Burns, , 1985a(Burns, , b, 1989, Leptodiaptomus in Northern America (Redfield & Vincent, 1979), and Eudiaptomus in Europe (Gicklhorn, 1923;Unestam, 1973;Miao & Nauwerck, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Fungal parasitism in freshwater calanoid population: ecological consequences and possible mechanisms involved in the infection process

Rossetti

2005

Hydrobiologia

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This paper reports the results of a study on a zoosporic fungus (Saprolegniaceae) parasitizing populations of Eudiaptomus intermedius (Copepoda, Calanoida) in mountain lakes located in the Northern Apennines, Italy. The dynamics of this infectious process was previously described in one of the lakes of the study area. The virulence is particularly high at the end of the calanoid reproductive phase, when the fungal hyphae penetrate the host eggs provoking their degeneration. Here new data are presented and the phenology of the host-parasite interaction is comparatively analyzed in different years and in different sites. The occurrence of the parasite was assessed at a regional scale. Possible mechanisms involved in the pathogen dispersal and in the host recognition are proposed, and the ecological impact of the fungal parasitism on the calanoid populations is discussed.

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Oomycete parasites in freshwater copepods of Patagonia: effects on survival and recruitment

García¹,

Jara²,

Steciow³

et al. 2018

Dis. Aquat. Org.

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Copepods are hosts to various oomycete parasite species, but the effects of pathogens on copepod populations have rarely been studied. This study aimed to characterize oomycete infection in the freshwater copepod Parabroteas sarsi in a temporary pond in Patagonia (Argentina). A complete hydroperiod was monitored, evaluating environmental variables as influencing factors in the oomycete infections. Laboratory experiments were performed to evaluate the susceptibility of infected copepods to consumption by predators. Although 5 species of copepods were present in the pond, only ovigerous P. sarsi females were parasitized by oomycetes. Two species of oomycetes were always found together: Aphanomyces ovidestruens and Pythium flevoense. Infections were detected at water temperatures >20°C, with a positive relationship between temperature and parasite prevalence. Infection occurred after a decrease in large filter-feeder densities. The pathogens were not lethal to P. sarsi females in the short-term, but did produce mortality of entire egg sacs, thus negatively impacting subsequent recruitment. Mean prevalence of infection in females was 53%, reaching 83% in December. Females have the capacity to release an infected egg sac and generate a new one in a few days. This infection does not affect the susceptibility of P. sarsi to the predator Notonecta vereertbruggheni. The decrease in female abundance registered towards the end of the hydroperiod could be related to a combination of factors that may have a differential effect on female survival, such as increasing temperature, the energy cost of egg sac development and carrying and oomycete infection.

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Impact of a fungal parasite on the reproductive potential of the freshwater calanoid Eudiaptomus intermedius

Cited by 4 publications

References 17 publications

Distribution and ecology of calanoid species in relation to morphometric and chemical characteristics of lakes and ponds of the Northern Apennines (Italy)

Distribution and ecology of calanoid species in relation to morphometric and chemical characteristics of lakes and ponds of the Northern Apennines (Italy)

Fungal parasitism in freshwater calanoid population: ecological consequences and possible mechanisms involved in the infection process

Oomycete parasites in freshwater copepods of Patagonia: effects on survival and recruitment

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