Caveat observator: the many faces of pre-spawning atresia in marine bivalve reproductive cycles

Beninger, Peter G.

doi:10.1007/s00227-017-3194-x

Cited by 31 publications

(20 citation statements)

References 79 publications

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“…Atresia is a natural part of the gametogenesis cycle in which the ovarian follicles die, allowing the resorption of gametes at the end of the hatching stage, and a resting period before a new cycle begins. Pre-spawning oocyte atresia may also occur (Beninger 2017 ). A typical indicator of atresia in females is vacuolisation within eggs (Fig.…”

Section: Resultsmentioning

confidence: 99%

Gonadal Atresia, Estrogen-Responsive, and Apoptosis-Specific mRNA Expression in Marine Mussels from the East China Coast: A Preliminary Study

Zhu

Chapman

et al. 2022

Bull Environ Contam Toxicol

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This preliminary survey analysed mussel atresia incidences, estrogen-responsive and apoptotic-specific molecular end points, and aqueous and gonadal levels of selected estrogens from the East China coast. Estrogen levels were low (e.g. < LOD-28.36 ng/L, < LOD-3.88 ng/g wet weight of tissue for BPA) relative to worldwide freshwater environments, but high oocyte follicle atresia incidences (up to 26.6%) occurred at selected sites. Expression of estrogen-responsive ER2 was significantly increased in males relative to females at sites with high atresia incidences in females. A second estrogen-responsive gene, V9, was significantly increased at two sites in April in females relative to males; the opposite was true for the remaining two sites. Apoptosis-specific genes (Bcl-2, fas) showed elevated expression in males relative to females at the site with the highest atresia incidence. These results provide coastal estrogen levels and the utility of several estrogen-specific molecular-level markers for marine mussels.

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Section: Resultsmentioning

confidence: 99%

Gonadal Atresia, Estrogen-Responsive, and Apoptosis-Specific mRNA Expression in Marine Mussels from the East China Coast: A Preliminary Study

Zhu

Chapman

et al. 2022

Bull Environ Contam Toxicol

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“…High frequencies of atretic oocytes and intense haemocyte infiltration occur during periods of intense reproductive activity in marine bivalves (Beninger, 2017; García‐Corona et al., 2018; Rodríguez‐Jaramillo et al., 2020). However, the treatments applied in this study contributed to low frequencies of atretic oocytes, compared to what naturally occurs in pectinids with high numbers of oocyte atresia during reproduction peaks (Beninger, 2017) and similarly occurred in the M. capax mussels treated with HUBC compounds (García‐Corona et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

Ultra‐diluted bioactive compounds enhance energy storage and oocyte quality during gonad conditioning of Pacific calico scallop Argopecten ventricosus (Sowerby II, 1842)

Mazón‐Suástegui

López‐Carvallo

Rodrı́guez-Jaramillo

et al. 2020

Aquaculture Research

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Ultra‐diluted bioactive compounds have emerged as an alternative to enhance marine organism performance and to improve broodstock gonad maturation. This study evaluated for the first time the effect of three homeopathically ultra‐diluted bioactive compounds (HUBC’s) authorized by the health authority as medicines for humans, on the general reproductive physiology of Argopecten ventricosus, a commercially important scallop species. The experiment included three HUBC’s treatments at centesimal dilution assessed in triplicate under laboratory conditions, T1: PaV‐30C + PhA‐30C, T2: PaV‐30C + SiT‐30C, and T3: ViT‐30C, and a non‐treated field reference group (FRG) maintained in aquaculture facilities as reference. The bioenergetics of scallop reproduction and oocyte quality increased with the three HUBC treatments, but particularly in those treated with T2. The organisms treated with T3 showed not only the highest proliferation of vitellogenic and post‐vitellogenic oocytes but also the greatest oxidative damage in tissues and oocytes. In contrast, the scallops from T1 and T2 showed less oxidative damage. The results suggest that ultra‐diluted formula T2 is a potential alternative to optimize A. ventricosus gonad ripening, food‐nutrient management and oocyte quality because although T3 allowed accelerating the gametogenesis process, it increased oxidative damage. This study could help to improve gonad broodstock condition and larval yield of this species in hatcheries.

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“…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%

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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Caveat observator: the many faces of pre-spawning atresia in marine bivalve reproductive cycles

Cited by 31 publications

References 79 publications

Gonadal Atresia, Estrogen-Responsive, and Apoptosis-Specific mRNA Expression in Marine Mussels from the East China Coast: A Preliminary Study

Gonadal Atresia, Estrogen-Responsive, and Apoptosis-Specific mRNA Expression in Marine Mussels from the East China Coast: A Preliminary Study

Ultra‐diluted bioactive compounds enhance energy storage and oocyte quality during gonad conditioning of Pacific calico scallop Argopecten ventricosus (Sowerby II, 1842)

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

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