Molecular taxonomy in 2D: a novel ITS2 rRNA sequence-structure approach guides the description of the oysters' subfamily Saccostreinae and the genus<i>Magallana</i>(Bivalvia: Ostreidae)

Salvi, Daniele; Mariottini, Paolo

doi:10.1111/zoj.12455

Cited by 58 publications

(58 citation statements)

References 86 publications

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“…Several tens of dead shells of the Portuguese oyster Magallana angulata (formerly known as Crassostrea angulata , until recently placed in the new genus Magallana 45 ) were sampled from shell middens at the land-facing margin of the Formosa inlet immediately adjacent to the locality of Cacela Velha (S. Portugal) and from a similar setting at the neighbouring location of Ilha de Tavira. Only shells with their valves still articulated and in a good state of preservation were selected for study.…”

Section: Methodsmentioning

confidence: 99%

Structure and crystallography of foliated and chalk shell microstructures of the oyster Magallana: the same materials grown under different conditions

Checa

Harper

González-Segura

2018

Sci Rep

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Oyster shells are mainly composed of layers of foliated microstructure and lenses of chalk, a highly porous, apparently poorly organized and mechanically weak material. We performed a structural and crystallographic study of both materials, paying attention to the transitions between them. The morphology and crystallography of the laths comprising both microstructures are similar. The main differences were, in general, crystallographic orientation and texture. Whereas the foliated microstructure has a moderate sheet texture, with a defined 001 maximum, the chalk has a much weaker sheet texture, with a defined 011 maximum. This is striking because of the much more disorganized aspect of the chalk. We hypothesize that part of the unanticipated order is inherited from the foliated microstructure by means of, possibly, twinning. Growth line distribution suggests that during chalk formation, the mantle separates from the previous shell several times faster than for the foliated material. A shortage of structural material causes the chalk to become highly porous and allows crystals to reorient at a high angle to the mantle surface, with which they continue to keep contact. In conclusion, both materials are structurally similar and the differences in orientation and aspect simply result from differences in growth conditions.

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Section: Methodsmentioning

confidence: 99%

Structure and crystallography of foliated and chalk shell microstructures of the oyster Magallana: the same materials grown under different conditions

Checa

Harper

González-Segura

2018

Sci Rep

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“…Currently, due to the work of Salvi, Macali, and Mariottini (2014) and Salvi and Mariottini (2017), the species Crassostrea gigas has been reclassified as Magallana gigas (Salvi & Mariottini, 2017), being in the World Register of Marine Species web as alternate representation (MolluscaBase, 2019). However, several investigations refute this change (Bayne et al, 2017), bringing with it a controversy.…”

Section: Materials and Me Thodsmentioning

confidence: 99%

Suspended culture evaluation of Pacific oysterCrassostrea gigasin a tropical estuary

et al. 2020

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The growth and survival of Crassostrea gigas were evaluated in hanging culture in the Chone River estuary (Bahía de Caráquez), Manabí province, Ecuador. Oyster seeds (~10 mm) were confined in lantern nets at a density equal to the occupation of half the surface of the basket base, until reaching commercial size (80 mm). A sample for oyster biometric, parasitic and bacterial analysis was obtained monthly. Temperature, salinity, oxygen concentration, seston and phytoplankton biomass were determined. At the end of the study, the oysters were analysed for heavy metal concentration. The commercial oyster production was extrapolated to estimate the possible economic performance of a family production module (a 7 × 7 m bamboo raft). The results show a great biological feasibility of culture of C. gigas with harvests of commercial size oysters in only 5 months and acceptable survivals (accumulated >70%, after 3 weeks of crop seed selection). The heavy metal concentrations and the parasitological and bacteriological analyses did not indicate levels of contamination. The economic projections suggest that, even with a profitability of 57%, the initially invested capital could be recovered within the first harvest.

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“…The Pacific oyster Magallana gigas (formerly Crassostrea gigas; Salvi and Mariottini 2016;Bayne et al 2017) is one of the most successful marine invaders with established populations beyond its natural range (see Ruesink et al 2005 and references therein). Pacific oysters are well established in different habitat types from sandy and muddy tidal flats, where they preferably attach to the blue mussel or to each other (Diederich 2005), to rocky shores (Ruesink 2007) and artificial hard substrates such as rocky dikes and harbour facilities (Smaal et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Colonisation success of introduced oysters is driven by wave-related exposure

et al. 2020

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The Pacific oyster, Magallana gigas, is an extremely successful invader with established populations in marine and estuarine habitats almost all over the world. Ecological implications of the introduction of this species to indigenous communities are well documented. However, the processes by which this species successfully establishes in a recipient com-munity is still insufficiently understood. The early detection of the oyster at the island of Helgoland (North Sea) provided the ideal opportunity to investigate whether physical mechanisms, such as waveexposure, influence their successful colonisation. We hypothesized that oyster colonisation benefits from wave-protected conditions. For this purpose, we evaluated colonisation success of M. gigas among wave-protected sites and wave-exposed sites along the island's pier system. The densities of M. gigas were significantly higher at wave-protected sites than at wave-exposed sites, and the frequency distributions of oyster lengths indicated better growth and higher survival rates in the harbours. This higher colonisation success at wave-protected sites may be explained by the relative retention time of water masses in the harbours, probably resulting in both reduced larval drift and lower energy demands for secretion formation (i.e. firmer binding to the substrate). The fact that the density of M. gigas can vary greatly on small spatial scales depending on exposure corroborates a multiple exposure sampling approach to monitor oyster populations in order to avoid potential overestimations of population sizes in given areas.

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Molecular taxonomy in 2D: a novel ITS2 rRNA sequence-structure approach guides the description of the oysters' subfamily Saccostreinae and the genusMagallana(Bivalvia: Ostreidae)

Cited by 58 publications

References 86 publications

Structure and crystallography of foliated and chalk shell microstructures of the oyster Magallana: the same materials grown under different conditions

Structure and crystallography of foliated and chalk shell microstructures of the oyster Magallana: the same materials grown under different conditions

Suspended culture evaluation of Pacific oysterCrassostrea gigasin a tropical estuary

Colonisation success of introduced oysters is driven by wave-related exposure

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