Two enigmas may solve each other: the oocyte coat and atresia in the common cockle, Cerastoderma edule (Linnaeus, 1758)

Chérel, Daphné; Beninger, Peter G.; Pennec, Gaël Le

doi:10.1007/s00227-020-03718-6

Cited by 5 publications

(4 citation statements)

References 46 publications

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“…20 or fewer) number of broods. The first hypothesis is supported by the investment in a thicker, durable coat, as it would function as a protective capsule against predators, mechanical impact, or attack of microorganisms, as has also been suggested for other bivalves (Chérel, Beninger & Le Pennec, 2020). The second hypothesis is supported by the presence of a communication between the supra-and infrabranchial chambers, providing a possibility for broods to pass through the ctenidia to be incubated in the infrabranchial chamber.…”

Section: Discussionmentioning

confidence: 80%

When size matters: the first comprehensive anatomical study of a species of “Condylocardiidae”, an extremely miniaturized bivalve

Passos

Batistão

Bieler

2021

PeerJ

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‘Miniaturization’ is a widespread phenomenon among the Metazoa. In the molluscan class Bivalvia, records of miniaturization are numerous. Among the Archiheterodonta, Warrana besnardi (Klappenbach, 1963) has attracted attention for its tiny size, which does not exceed 1.5 mm in shell length, and because it belongs to a group with limited anatomical information and often-debated status, the “Condylocardiidae” (which recent molecular studies place deeply nested within the family Carditidae). All species of Warrana Laseron, 1953 are small-bodied, and so miniaturization presumably occurred from a large-bodied ancestor within the Carditidae sensu lato. South American W. besnardi is here studied in detail. Its small size and the enlargement of the anterodorsal region during growth, reflects (and likely led) to infaunal habit, living as a burrowing bivalve that passively feeds on deposit particles entering the pallial cavity anteriorly. Mantle glands, previously reported as a common feature of other archiheterodonts, are missing in W. besnardi, but spongiform tissue in the antero-ventral portion of the mantle lobes presumably represents a blood sinus that might compensate for the great reduction of the ctenidia. Lecithotrophy is reported, with yolky oocytes bearing a thick non-cellular capsule layer; brooding was not observed, and it is here hypothesized that the extreme miniaturization, with the great reduction of ctenidia, is responsible for a shift in the reproductive mode of condylocardiids, contrasting with the commonly reported ovoviviparity of the carditids.

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Section: Discussionmentioning

confidence: 80%

When size matters: the first comprehensive anatomical study of a species of “Condylocardiidae”, an extremely miniaturized bivalve

Passos

Batistão

Bieler

2021

PeerJ

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“… Note : Total active gametogenesis = individuals for which mature oocytes ≥20% of gamete volume fraction; April–May = aggregated data from all years for these 2 months, during which all atresia is prespawning. Data from Chérel and Beninger (2017) and Chérel et al (2020). …”

Section: Resultsmentioning

confidence: 99%

“…Previous work has highlighted the ubiquitous, often‐overlooked presence of atresic (degenerating) oocytes of all gametogenic stages within the gonads of marine bivalves (see Beninger, 2017; Chérel & Beninger, 2017, 2019; Chérel et al, 2020 for reviews and references). Despite the prolific scientific literature on reproductive cycles in high‐fecundity marine organisms, only one study to date has examined the viability of their spawned oocytes (Beninger et al, 2021), that is, what proportion are actually capable of being fertilized and beginning development?…”

Section: Introductionmentioning

confidence: 99%

“…Aggregated data for minimum atresic impact (defined as the percentage of mature oocyte volume fraction for which an atresic fate is known from histological profile) in two intertidal bivalve species, Cerastoderma edule and Tapes philippinarum, based on quantitative histological observations of the gonad, from two sites and years 2010Total active gametogenesis = individuals for which mature oocytes ≥20% of gamete volume fraction; April-May = aggregated data from all years for these 2 months, during which all atresia is prespawning. Data fromChérel and Beninger (2017) andChérel et al (2020).…”

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confidence: 99%

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Evolutionary and ecological insights from vital staining of bivalve oocytes: A Red Queen at the sweepstakes?

et al. 2022

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To determine the proportion of inviable oocytes that are spawned along with normal oocytes in marine bivalves, we turned to a time-honored technique not previously used on invertebrate oocytes: the neutral red vital stain. Despite the difficulty in obtaining induced spawns from field-collected Cerastoderma edule (L), the results and insights from this simple procedure to answer a simple question were unexpected and far-reaching. Mean proportions of inviable oocytes in the spawns of cockle C. edule ranged from 35% to 85%, with the vast majority represented by atresic (autolyzing) oocytes. These levels are in agreement with previous quantitative histological observations of prespawning atresia in both C. edule and the Manila clam Tapes philippinarum. Such elevated prefertilization inviability mirrors the known high level of postfertilization inviability in bivalves. Together, these high levels of inviability may account for much of the early mortality in the type III survivorship curves typical of marine bivalves. The combination of high fecundity and high oocyte inviability suggests a Red Queen-type reproductive dilemma in these species. In addition, the great degree of interindividual variation observed in oocyte inviability suggests that cockles, and perhaps other intertidal bivalves, present a Sweepstakes Reproductive Strategy, in which highly variable individual fecundity confronts a highly variable environment. The neutral red technique promises to be a useful tool for investigating prespawning inviability in other marine taxa, as well as for aquaculture, conservation, restocking, ecophysiology, and environmental monitoring.

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Morphological aspects of oogenesis in the deep-sea clam Calyptogena pacifica (Pliocardiinae; Vesicomyidae)

Yurchenko,

Borzykh,

Kalachev

2023

Mar Biol

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Two enigmas may solve each other: the oocyte coat and atresia in the common cockle, Cerastoderma edule (Linnaeus, 1758)

Cited by 5 publications

References 46 publications

When size matters: the first comprehensive anatomical study of a species of “Condylocardiidae”, an extremely miniaturized bivalve

When size matters: the first comprehensive anatomical study of a species of “Condylocardiidae”, an extremely miniaturized bivalve

Evolutionary and ecological insights from vital staining of bivalve oocytes: A Red Queen at the sweepstakes?

Morphological aspects of oogenesis in the deep-sea clam Calyptogena pacifica (Pliocardiinae; Vesicomyidae)

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