Seasonal variation of transcriptomic and biochemical parameters of Donax trunculus related to its infection by Bacciger bacciger (trematode parasite)

Magalhães, Luísa; Montaudouin, Xavier de; Correia, Simão; Daffe, Guillemine; Gonzalez, Patrice; Figueira, Etelvina; Gonçalves, Jorge M. S.; Freitas, Rosa

doi:10.1016/j.ecss.2019.02.012

Cited by 8 publications

(2 citation statements)

References 53 publications

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“…Previously, non‐destructive assessment has been achieved through monitoring of cercarial release in the laboratory (Taskinen, 1998a; Choo & Taskinen, 2015; Magalhães et al, 2017). However, recent work (Magalhães et al, 2017; Magalhães et al, 2019) has shown that this results in estimates of infection rates between 5 and 10 times less than reality, as determined by destructively dissecting the gonad. There is the possibility for cercarial monitoring to reach high accuracy: at elevated temperatures, Choo & Taskinen (2015) showed that this technique could reliably diagnose infection.…”

Section: Discussionmentioning

confidence: 95%

A rapid, non‐destructive method for sampling castrating parasites in endangered bivalve molluscs

Brian

Aldridge

2020

Aquatic Conservation

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Bivalves are important ecosystem engineers, and there is emerging evidence that many species are afflicted with castrating parasites. Understanding the prevalence of these largely overlooked parasites is crucial in understanding the fundamental biology of bivalves, informing conservation efforts, and providing a wider understanding of host–parasite dynamics. Current techniques to assess the presence of parasites are destructive, making them untenable for endangered or protected populations. This article presents a non‐destructive method of sampling bivalve molluscs (Anodonta anatina) to detect castrating trematodes. Gonadal fluid is removed with a hypodermic needle from bivalves in situ and analysed in a laboratory setting without removing the mollusc from the field; this sampling mechanism has previously been shown not to harm the mollusc. A single 50 μl sample is sufficient to detect both the presence and developmental stage of the trematode with greater than 95% reliability, with all but the lightest infections visible. We recommend that this technique should be used to enhance knowledge on host–parasite dynamics in bivalves, and inform sensible conservation for threatened species.

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Section: Discussionmentioning

confidence: 95%

A rapid, non‐destructive method for sampling castrating parasites in endangered bivalve molluscs

Brian

Aldridge

2020

Aquatic Conservation

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“…The digeneans in a sporocyst stage generally utilize mollusks as the first intermediate host and invade a variety of vertebrates and invertebrates in the form of metacercaria (Littlewood, 2006). The metacercaria infection often results in retarded growth (Wegeberg and Jensen, 2003;Thieltges, 2006a); increased energy demand (Magalhães et al, 2019); manipulation of host behavior, leading the host to become conspicuous to their predators (Lafferty and Morris, 1996;Thomas and Poulin, 1998;Eliuk et al, 2020); and mortalities (Gordon and Rau, 1982;Jacobson et al, 2008;Magalhães et al, 2015). However, most metacercaria infections pose a relatively minor impact on hosts, as they do not reproduce in the host (Bower et al, 1994;Rhode, 2005).…”

Section: Introductionmentioning

confidence: 99%

Effects of larval trematode parasitism on the reproductive capacity of Manila clam Ruditapes philippinarum in a sandy-mud tidal flat on the west coast of Korea

et al. 2022

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Gonad intrusion of the larval trematodes often results in substantial damage to the reproductive capacity of some economically important marine bivalves. Such detrimental impacts of the larval trematode infection are observed in Manila clam Ruditapes philippinarum in the coastal Yellow Sea, although the effects on the host’s reproduction are poorly understood. Accordingly, this study attempts to understand the impacts of parasitism on clam reproduction using histology. Of the 1,255 adult clams collected in early June from a tidal flat on the west coast of Korea, 68 individuals (5.4%) were infected by three different larval trematodes, including Cercaria tapidis, Cercaria pectinata, and Parvatrema duboisi. Histology revealed that the uninfected clams were in the late developing or ripe stage, exhibiting fully developed gametes in the expended follicles. In contrast, clams infected by the larval trematode showed retarded gonad maturation. Some of those clams remained sexually indifferent (13/68 infected clams) or early developing (9/68 infected clams). We categorized the infection level into uninfected (0), light (1), moderate (2), heavy (3), and very heavy (4), according to the area of sporocysts occupying the histology section. The image analysis indicated that approximately 50% of the infected clams were in “heavy” and “very heavy” conditions, and they occupied 16.7% and 26.9% of the total cross-section area, respectively. The nonparametric Kruskal–Wallis’s test and the post-hoc Tukey’s test indicated that the condition index (CI) of clams in heavy and very heavy infection were significantly lower than uninfected clams. In conclusion, the larval trematodes infected about 5.4% of the clam population in the tidal flat on the west coast of Korea, and we estimated that 32.4% of the infected clams might fail to reproduce during a spawning period due to the severe infection.

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Contamination levels and spatial distribution in the lagoons of the Po river delta: Are chemicals exerting toxic effects?

Viganò

Stefani

Casatta

et al. 2019

Estuarine, Coastal and Shelf Science

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Seasonal variation of transcriptomic and biochemical parameters of Donax trunculus related to its infection by Bacciger bacciger (trematode parasite)

Abstract: Seasonal variation of transcriptomic and biochemical parameters of Donax trunculus related to its infection by Bacciger bacciger (trematode parasite)

Cited by 8 publications

References 53 publications

A rapid, non‐destructive method for sampling castrating parasites in endangered bivalve molluscs

A rapid, non‐destructive method for sampling castrating parasites in endangered bivalve molluscs

Effects of larval trematode parasitism on the reproductive capacity of Manila clam Ruditapes philippinarum in a sandy-mud tidal flat on the west coast of Korea

Contamination levels and spatial distribution in the lagoons of the Po river delta: Are chemicals exerting toxic effects?

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