First Record and Description of Metacercariae of Curtuteria Arguinae N. Sp. (Digenea: Echinostomatidae), Parasite of Cockles Cerastoderma Edule (Mollusca: Bivalvia) in Arcachon Bay, France

Desclaux, Céline; Russell-Pinto, Fernanda; Montaudouin, Xavier de; Bachelet, Guy

doi:10.1645/ge-3512.1

Cited by 27 publications

(29 citation statements)

References 35 publications

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“…Shedding and transmission of trematode larvae is known to be temperature dependent (Jensen et al 1999, Gam et al 2008, Thieltges 2008. In temperate tidal areas the period of infection is spring to autumn (Desclaux et al 2006, Thieltges 2008. Infectivity of cercariae is increased 81 Dis Aquat Org 98: [73][74][75][76][77][78][79][80][81][82][83][84] 2012 at higher temperatures until a certain threshold is reached (Jensen et al 1999), which may explain the observations in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…The assumption that larger cockles would have a higher intensity of trematodes is based on larger cockles having larger siphons and in gesting cercariae with greater ease. But, it is known that there is great plasticity in cockle siphon length and cercariae may be of different lengths (de Montaudouin et al 2005, Desclaux et al 2006). The methodology used may also have partially influenced the results; a section was cut through each animal and all trematodes in that section were counted; therefore, the whole body was not screened and trematode numbers may have been underestimated.…”

Section: Discussionmentioning

confidence: 99%

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Influence of disseminated neoplasia, trematode infections and gametogenesis on surfacing and mortality in the cockle Cerastoderma edule

Morgan¹,

O’Riordan²,

Kelly³

et al. 2012

Dis. Aquat. Org.

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Cerastoderma edule is a widely distributed bivalve mollusc, commercially exploited throughout Europe and is also an important food source for birds and crustaceans. Recently, mass surfacing and mortalities of cockles have been observed and reported at sites in Ireland and elsewhere, particularly in the summer months. One such site is Flaxfort Strand, Courtmacsherry Bay, County Cork, Ireland, an important feeding area used by many seabirds during the summer months. For the past few years large numbers of surfaced cockles have been observed at the site in a moribund condition. Samples of cockles from this area were collected over the summer months and their health status assessed. Cockles that had surfaced (moribund) and those still buried in the sediment were quantified and screened: sex, gonadal maturity and size class of cockles were also determined. Disseminated neoplasia and trematodes were observed in screened cockles. The most significant finding during the study was that mortalities and surfacing of cockles was related to a greater incidence of disseminated neoplasia. No neoplasia was observed in the smallest and largest size classes. There was a significantly higher prevalence of neoplasia in moribund cockles than in buried cockles, whereas in both groups a similar concentration of trematode metacercariae was observed in the screened tissues. Also, most of the cockles that had surfaced were either in the process of spawning or were spent. Overall a much larger percentage of moribund cockles exhibited both trematode infections plus neoplasia compared with buried cockles. A combination of the presence of neoplasia and trematodes, along with stress related to spawning, may immunocompromise the cockless, causing the animals to surface and become moribund. KEY WORDS: Cerastoderma edule · Disseminated neoplasia · Trematodes · Surfacing · Gametogenesis Resale or republication not permitted without written consent of the publisherDis Aquat Org 98: [73][74][75][76][77][78][79][80][81][82][83][84] 2012 cockles peaked in 1987 when 106 494 tonnes of cockles were harvested, but decreased to 11 809 tonnes in 2009, the last year for which statistics are available (www.fao.org/fishery/species/3535/en; accessed 6 Sep 2011). Declines in yields can be attributed, in part, to the ban of mechanical cockle fishing in the Wadden Sea (The Netherlands) since 1 January 2005, and to further restrictions on other sand flats such as the Oosterschelde (www.seaonscreen.org/ vleet/content/eng/cockle-fisheries.htm). Yields for cultured C. edule have been variable in the past (www. fao.org/fishery/species/3535/en; accessed 6 Sep 2011).Sexual maturity is usually reached when cockles are 18 mo old or when shell length reaches 15 to 20 mm (Seed & Brown 1977). Seed & Brown (1977) reported that cockles overwinter in a spent condition, but gametogenesis from late autumn/early winter has also been described (Twomey 1987). Gonadal development occurs rapidly once initiated in the spring and spawning begins in late spring/early summe...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of disseminated neoplasia, trematode infections and gametogenesis on surfacing and mortality in the cockle Cerastoderma edule

Morgan¹,

O’Riordan²,

Kelly³

et al. 2012

Dis. Aquat. Org.

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“…Usually, prevalence of infection approaches such a high value only amongst rather large host individuals in natural environments (Desclaux et al 2006;Nikolaev et al 2006). Bowers and James (1967) occasionally detected M. minutus in cockle spat older than 6 months, whilst Goater (1993) revealed the first metacercariae to occur in 1-year-old cockles.…”

Section: Infections In the Secondary Hostmentioning

confidence: 99%

“…Presumably, infections may appear right after settlement of cockle spat. Relatively small cercariae of various digenean trematode species have been reported to successfully infect cockles of similar size under natural conditions (Desclaux et al 2006) and in the laboratory , whilst infection efficiency of large digenean trematode species was found to be low in small cockle spat (Wegeberg et al 1999). It can be concluded that the shell length threshold for infections by M. minutus is rather low.…”

Section: Infections In the Secondary Hostmentioning

confidence: 99%

Intrapopulational distribution of Meiogymnophallus minutus (Digenea, Gymnophallidae) infections in its first and second intermediate host

et al. 2009

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Host size and age are generally assumed to play a pivotal role in digenean trematode infection patterns, accounting for much of the variation found within intermediate host populations. However, knowledge is based on a limited number of studied host-parasite systems. We investigated the shell length class distribution of Meiogymnophallus minutus infections within populations of the first intermediate host Scrobicularia plana and second intermediate host Cerastoderma edule. Infections occurred very early in the life of the two intermediate hosts. Both prevalence and intensity of infections increased with host shell length and displayed extremely high values amongst large individuals. Whilst metacercarial infection patterns in juvenile C. edule could be best explained by differences in host shell length, in adult cockles, the effect of host age on infection levels prevailed. The microsporidian hyperparasite Unikaryon legeri, occurring in the metacercarial stage of M. minutus, was particularly abundant in aged cockles, strongly influencing infection patterns of the gymnophallid. Our results are consistent with the intrapopulational distribution reported from other digenean trematode parasites. The relative influence of both host size and age and the underlying mechanisms as well as the impact of hyperparasitism on M. minutus infection patterns are discussed.

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“…Correspondence analysis discriminated stations by their species composition and three groups were separated (Fig. 2) (Desclaux et al 2006). H. quissetensis, H. continua and Renicola roscovita were ubiquitous.…”

Section: The Cockle Cerastoderma Edulementioning

confidence: 99%

Parasite co-infection of two sympatric bivalves, the Manila clam (Ruditapes philippinarum) and the cockle (Cerastoderma edule) along a latitudinal gradient

Lassalle

Montaudouin

Soudant

et al. 2007

Aquat. Living Resour.

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. Parasite coinfection of two sympatric bivalves, the Manila clam (Ruditapes philippinarum) and the cockle (Cerastoderma edule) along a latitudinal gradient. Aquatic Living Resources, EDP Sciences, 2007, 20, pp.33-42. <10.1051/alr:2007013>. Aquat. Living Resour. 20, 33-42 (2007 Abstract -Among the potential biotic factors affecting population dynamics, parasitism has received relatively little attention. The purpose of this study was to inventory marine bivalve parasites and to investigate relations between different parasite communities. Five intertidal stations along the French Atlantic shore were studied between Brittany and Arcachon Bay. Two bivalves (the edible cockle, Cerastoderma edule, and the Manila clam, Ruditapes philippinarum) were sampled and examined. The parasites included a bacterium (Vibrio tapetis), a protozoan (Perkinsus sp.), and digenetic trematode metacercariae (10 species). Perkinsus sp. prevalence and density in clams were higher than those measured in cockles (30 250 vs. 36 cells g −1 of gill wet weight, respectively) while digeneans were more common in cockles (46 metacercariae per cockle host vs. 1 per clam host). Distributions of digeneans and Perkinsus sp. were similar along the Atlantic shore. However, at each sampling station and at the individual scale, no correlation between Perkinsus sp. and digenean abundance was detected. These results suggest different ecological niches used by these two parasites within a community of bivalves but a similar response to environmental factors such as temperature and salinity. Vibrio tapetis was found at relatively high prevalence in all stations for both bivalve species (from 17% to 43% in cockles and from 23% to 50% in clams), but was associated with a low prevalence of Brown Ring Disease (BRD), a shell disease caused by this pathogen. No statistically significant relationship of these parasitic bacteria with trematodes and Perkinsus sp. was evidenced in the present study. Key words:Bivalve mollusc / Digenea /Parasites / Host specificity / Infectivity / NE Atlantic Ocean Résumé -Co-infestation de parasites chez deux mollusques bivalves, la palourde (Ruditapes philippinarum) et la coque (Cerastoderma edule) le long d'un gradient latitudinal. Parmi les facteurs biotiques pouvant affecter la dynamique de populations, le parasitisme a reçu relativement peu d'attention. Le but de cette étude est d'inventorier les parasites de bivalves marins et de rechercher les relations entre les différentes communautés de parasites. Cinq stations intertidales le long du littoral français, entre la Bretagne et la baie d'Arcachon, ont été étudiées. Deux espèces de bivalves, la coque (Cerastoderma edule) et la palourde (Ruditapes philippinarum) ont été échantillonnées et examinées. Les parasites présents sont une bactérie (Vibrio tapetis), un protozoaire (Perkinsus sp.) et des métacercaires de trématodes digènes (10 espèces). La prévalence et la densité de Perkinsus sp. dans les palourdes sont supérieures à celles mesurées pour les coques (30 25...

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First Record and Description of Metacercariae of Curtuteria Arguinae N. Sp. (Digenea: Echinostomatidae), Parasite of Cockles Cerastoderma Edule (Mollusca: Bivalvia) in Arcachon Bay, France

Cited by 27 publications

References 35 publications

Influence of disseminated neoplasia, trematode infections and gametogenesis on surfacing and mortality in the cockle Cerastoderma edule

Influence of disseminated neoplasia, trematode infections and gametogenesis on surfacing and mortality in the cockle Cerastoderma edule

Intrapopulational distribution of Meiogymnophallus minutus (Digenea, Gymnophallidae) infections in its first and second intermediate host

Parasite co-infection of two sympatric bivalves, the Manila clam (Ruditapes philippinarum) and the cockle (Cerastoderma edule) along a latitudinal gradient

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