Larval dispersal of pearl oysters Pinctada margaritifera in the Gambier Islands (French Polynesia) and exploring options for adult restocking using in situ data and numerical modelling

Bruyère, Oriane; Chauveau, M.; Gendre, Romain Le; Liao, Vetea; Andréfouët, Serge

doi:10.1016/j.marpolbul.2023.115059

Cited by 7 publications

(18 citation statements)

References 32 publications

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“…Data shown here are complementary to those shown in Bruyère et al (2023a) which were more specific to the study of the Rikitea sub-lagoon.…”

Section: Hydrodynamic Overviewssupporting

confidence: 72%

“…The sampling strategy mostly focused on the northern part of the Gambier lagoon, and especially the Rikitea lagoon (Figure 4). The sampling aimed to characterize the inward-outward flows from the three boundary sectors, in the north, south-east and south orientations (Bruyère et al, 2023a). Beyond the Rikitea lagoon, the sampling also targeted the different sections of the barrier reef with a different exposition in order to characterize the incoming waves.…”

Section: Sampling Strategymentioning

confidence: 99%

“…This site has been however rather overlooked in term of scientific investigations aiming to support pearl farming management. Despite its good pearl production performances, Gambier also suffers from problems, such as lagoonal space limitation (André et al, 2022) and more critically a recent decrease in spat collection rates (Bruyère et al, 2023a). Better understanding of spat collection require the characterization of the oyster stocks (Bionaz et al, 2022), oyster life cycle (Le Moullac et al, 2012), and a good knowledge of hydrodynamic functioning of lagoons in relation to forcing factors such as tides, wind or waves.…”

mentioning

confidence: 99%

“…Better understanding of spat collection require the characterization of the oyster stocks (Bionaz et al, 2022), oyster life cycle (Le Moullac et al, 2012), and a good knowledge of hydrodynamic functioning of lagoons in relation to forcing factors such as tides, wind or waves. Several pearl farming Tuamotu atoll lagoons have been instrumented in the past to study their hydrodynamics (Dumas et al, 2012;Andréfouët et al 2023a;Bruyère et al, 2023b) and Gambier was added to the list starting in late 2019 as the first high volcanic islands investigated with an array of physical oceanography instruments (Bruyère et al, 2023a). The sampling strategy is different than the general strategy applied to atolls as the focus of the investigation on Gambier was on a spat-producing sub-lagoon (Bruyère et al, 2023a) and because the hoa (vernacular name for the shallow passages transversal to an atoll rim) were not instrumented here unlike for atolls.…”

mentioning

confidence: 99%

“…Several pearl farming Tuamotu atoll lagoons have been instrumented in the past to study their hydrodynamics (Dumas et al, 2012;Andréfouët et al 2023a;Bruyère et al, 2023b) and Gambier was added to the list starting in late 2019 as the first high volcanic islands investigated with an array of physical oceanography instruments (Bruyère et al, 2023a). The sampling strategy is different than the general strategy applied to atolls as the focus of the investigation on Gambier was on a spat-producing sub-lagoon (Bruyère et al, 2023a) and because the hoa (vernacular name for the shallow passages transversal to an atoll rim) were not instrumented here unlike for atolls. As such, this paper presents the hydrodynamic data recorded in Gambier lagoons during a 9-month deployment period (June 2019-February 2020).…”

mentioning

confidence: 99%

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Lagoon hydrodynamics of pearl farming islands: the case of Gambier (French Polynesia)

Bruyère,

Le Gendre,

Liao

et al. 2023

Preprint

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Abstract. Between 2019 and 2020, the Gambier lagoon was instrumented over a period of 9 months with a large array of autonomous oceanographic instruments measuring temperature, pressure and current. Two deployments were conducted, respectively from June 2019 to October 2019 (Leg1) and from late October 2019 to late February 2020 (Leg2). A total of sixteen instrumented locations were spread across the lagoon and on the forereef. Physical parameters were measured to characterize the wave climate, tide and surges, lagoonal circulation, and spatial and vertical temperature variabilities. Those observations were part of the ANR-funded MANA project (2017–2022) and its derivatives that aimed to improve knowledge of processes influencing the spat collection of Pinctada margaritifera oysters that are used for black pearl farming and production. This data set was a prerequisite for the development of a high resolution biophysical model on Gambier lagoon which aims at tackling the connectivity oyster larvae. The sampling strategy focused on the northern region of Gambier lagoon and especially on the sub-lagoon of Rikitea which is a prime spat collection site. The data set was post processed, quality controlled and is archived in a dedicated repository with a permanent DOI into the SEANOE marine data platform.

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“…Data shown here are complementary to those shown in Bruyère et al (2023a) which were more specific to the study of the Rikitea sub-lagoon.…”

Section: Hydrodynamic Overviewssupporting

confidence: 72%

Section: Sampling Strategymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Lagoon hydrodynamics of pearl farming islands: the case of Gambier (French Polynesia)

Bruyère,

Le Gendre,

Liao

et al. 2023

Preprint

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The hydrodynamics of Lizard Island lagoon, Great Barrier Reef

Philipps,

Bellwood

2024

Coral Reefs

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Hydrodynamic processes are a major driver for marine systems, linking marine organisms with their environment. However, a lack of hydrodynamic data at an ecologically relevant spatial resolution has stymied our understanding of reef function, as exemplified by Lizard Island on the Great Barrier Reef. To address this gap, 23 to 27 Marotte HS current meters were deployed over three periods, collecting 15 months of current velocity data. Combining these data with wind and tide datasets, we provide a preliminary description of the circulation in the Lizard Island lagoon, examining wind and tide influence, and flushing time. During south-easterly trade winds, flood tides flow through the Lagoon Entrance, while wind-induced waves cross the Bird-South crest, driving a north-westerly flow through Loomis Channel and across the western lagoon. Ebb tides flow east–south-east through the Lagoon Entrance and south-west through the Palfrey-South channel. Tides contribute a mean of 20.4% to the overall current speed, particularly in deeper sites with less reef interference, while shallow sites were more influenced by wind. Lizard Island lagoon flushing times ranged from a few hours to 10 days; longer during periods with low wind speeds. Hindcast flushing times during the 2016 coral bleaching event (following 8 Degree Heating Weeks) were approximately 22 h, suggesting that flushing time likely had minimal influence on bleaching. Our analyses provide initial insights into the circulation of the Lizard Island system and aid understanding of the potential relationships between reef organisms and their physical environment, bridging the gap between ecology and hydrodynamics.

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Comparison of in situ black-lipped oyster spat collection and larval dispersal modelling results in semi-closed pearl-farming lagoons of the Tuamotu Archipelago

Andréfouët,

Bruyère,

Le Gendre

et al. 2024

Marine Pollution Bulletin

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Larval dispersal of pearl oysters Pinctada margaritifera in the Gambier Islands (French Polynesia) and exploring options for adult restocking using in situ data and numerical modelling

Cited by 7 publications

References 32 publications

Lagoon hydrodynamics of pearl farming islands: the case of Gambier (French Polynesia)

Lagoon hydrodynamics of pearl farming islands: the case of Gambier (French Polynesia)

The hydrodynamics of Lizard Island lagoon, Great Barrier Reef

Comparison of in situ black-lipped oyster spat collection and larval dispersal modelling results in semi-closed pearl-farming lagoons of the Tuamotu Archipelago

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