Is the reproduction of Donax trunculus affected by their sites of origin contrasted by their level of contamination?

Tlili, Sofiène; Métais, Isabelle; Ayache, Nadia; Boussetta, Hamadi; Mouneyrac, Catherine

doi:10.1016/j.chemosphere.2011.05.009

Cited by 33 publications

(13 citation statements)

References 40 publications

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“…This high frequency of null alleles found in this study is consistent with many reports in other bivalve species (Launey et al, 2002; Nantón et al, 2014; Chiesa et al, 2016). Clams are filter feeders and thus, are prone to accumulate xenobiotic compounds (Tlili et al, 2010; Yawetz et al, 2010; Bouzas et al, 2011; Company et al, 2011; Hamdani & Soltani-Mazouni, 2011; Tlili et al, 2011). It is plausible that the mutagenic action of some pollutants such as heavy metals (e.g., mercury or cadmium) (Wong, 1988) can be responsible for an increased mutation rate in clams.…”

Section: Resultsmentioning

confidence: 99%

“…Because, wedge clams are filter feeders, they play important roles in the trophic structure of beaches, but can also accumulate xenobiotic compounds making them, ideal model organisms for environmental monitoring (Saavedra & Bachere, 2006). For this reason, they may also constitute potential risks for human health when they are eaten and thus have been extensively studied from an ecotoxicology perspective (Tlili et al, 2010; Yawetz et al, 2010; Bouzas et al, 2011; Company et al, 2011; Hamdani & Soltani-Mazouni, 2011; Tlili et al, 2011). …”

Section: Introductionmentioning

confidence: 99%

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Null alleles are ubiquitous at microsatellite loci in the Wedge Clam (Donax trunculus)

Rico

Cuesta

Drake

et al. 2017

PeerJ

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Recent studies have reported an unusually high frequency of nonamplifying alleles at microsatellite loci in bivalves. Null alleles have been associated with heterozygous deficits in many studies. While several studies have tested for its presence using different analytical tools, few have empirically tested for its consequences in estimating population structure and differentiation. We characterised 16 newly developed microsatellite loci and show that null alleles are ubiquitous in the wedge clam, Donax trunculus. We carried out several tests to demonstrate that the large heterozygous deficits observed in the newly characterised loci were most likely due to null alleles. We tested the robustness of microsatellite genotyping for population assignment by showing that well-recognised biogeographic regions of the south Atlantic and south Mediterranean coast of Spain harbour genetically different populations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Null alleles are ubiquitous at microsatellite loci in the Wedge Clam (Donax trunculus)

Rico

Cuesta

Drake

et al. 2017

PeerJ

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“…The physiological status was estimated by calculating the condition index as the relative (percentage) relationship between wet weight (no shell) and total weight (Mouneyrac et al, 2008). As additional indicator of health status, growth was examined by considering the weight (total weight, wet weight or shell weight) of each specimen with respect to length (Tlili et al, 2011). To this end, the relationship between weight and shell length was calculated using the potential function y = ax b , where: y is total weight, wet weight or shell weight, a and b are constants, and x is length.…”

Section: Size Frequency Condition Index and Weight-length Relationsmentioning

confidence: 99%

Evidence of health impairment of Megapitaria squalida (Bivalvia: Veneridae) near the “hot spot” of a mining port, Gulf of California

et al. 2017

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Background. It is known that organisms inhabiting polluted marine habitats may experience adverse physiological effects. The port of Santa Rosalía, Gulf of California, is characterized by high concentrations of heavy metals in sediments, particularly Cu, Zn, Co, Mn, Pb, and U, which are potentially toxic to the marine biota. In addition, this port receives urban wastewater that contributes mostly organic pollutants to the coastal zone. Goals. The main objective of this work was to determine whether clams in the mining region showed adverse effects because of the contamination. Methods. Through the analysis of biometric parameters, condition index, and weight-length relationship, the overall health of the chocolate clam Megapitaria squalida was evaluated in the coastal zone of the Santa Rosalía port and compared with data for clams from four mining-free areas. Results. Our findings revealed that clams from Santa Rosalía showed poor health, evidenced by their smaller size, inferior condition, and negative allometric growth compared to clams from all other sites, including San Lucas, a site located a few kilometers away from the pollution hot-spot and where the conditions of temperature and food availability are similar to those in the port area. Conclusions. All of the above suggests negative physiological effects in this species possibly caused by contamination from metals and/or organic pollutants from urban discharges. Particularly, it is likely that M. squalida at the mining site allocates more energy towards depurating or storing metals, in turn leading to poorer condition and deficient growth.

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“…In temperate regions, Herrmann et al (2009) revealed that D. hanleyanus in Argentina shows two annual gametogenic cycles, while D. trunculus in Tunisia has an annual reproductive cycle and a single spawning season (Tlili et al 2011). In Portugal D. trunculus begins to release gametes from March to August (Gaspar et al 1999).…”

Section: Discussionmentioning

confidence: 99%

Reproductive cycle and gonadal development of <em>Donax striatus</em> (Bivalvia: Donacidae) on an Amazon sandy beach in northern Brazil

Gadelha

Silva

et al. 2019

Sci. Mar.

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The reproductive cycle and gonadal development of Donax striatus from a sandy beach in Ajuruteua, Amazon region, were studied. Monthly sampling took place from March 2015 to April 2016. Histological analysis was performed on 420 individuals, and the oocyte diameters were determined from histological sections and used to determine the reproductive period. The population showed a balanced sex ratio (1:1) with a size at first maturity of 10.9 mm in males and 8.9 mm in females. The population showed r-strategist characteristics and continuous spawning, and the reproductive cycle showed no seasonal variation or significant relation with any environmental parameter. The organic matter was significantly higher in the rainy season. According to the generalized linear model analysis (GLM), only the condition index (CI) had a significant relationship with the organic matter of the sediment. The type of reproductive strategy adopted by D. striatus corroborates the global breeding hypotheses for species of tropical environments. For conservation, it should be recommended to harvest this species at a shell length above 13 mm.

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Is the reproduction of Donax trunculus affected by their sites of origin contrasted by their level of contamination?

Cited by 33 publications

References 40 publications

Null alleles are ubiquitous at microsatellite loci in the Wedge Clam (Donax trunculus)

Null alleles are ubiquitous at microsatellite loci in the Wedge Clam (Donax trunculus)

Evidence of health impairment of Megapitaria squalida (Bivalvia: Veneridae) near the “hot spot” of a mining port, Gulf of California

Reproductive cycle and gonadal development of <em>Donax striatus</em> (Bivalvia: Donacidae) on an Amazon sandy beach in northern Brazil

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