Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia

Charpy, Loïc; Rodier, Martine; Fournier, Jonathan; Langlade, Marie-José; Gaertner‐Mazouni, Nabila

doi:10.1016/j.marpolbul.2011.12.026

Cited by 30 publications

(22 citation statements)

References 27 publications

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“…The proportion of picoplankton was close to that recorded in other atoll lagoons and in agreement with additional measurements in Ahe made in 2009 and 2010 (Charpy, 1996;Charpy et al, 2012).…”

Section: Hydrobiological Contextsupporting

confidence: 90%

“…In May, the highest biomass values were observed at station 1, in the more confined, southwest shallow area of the lagoon where pearl farming is more intensive. The highest chlorophyll values reported there correspond to highest phytoplankton production values provided by both Charpy et al (2012) and Lefebvre et al (2012). According to Loret et al (2000) for Takapoto Atoll, these observations could be linked to the recycling of nutrients by pearl oysters.…”

Section: Hydrobiological Contextmentioning

confidence: 74%

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Metazooplankton communities in the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia): Spatiotemporal variations and trophic relationships

Pagano

Sagarra

Champalbert

et al. 2012

Marine Pollution Bulletin

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Metazooplankton abundance, biomass (<80 μm, 200-500 μm and >500 μm) and community structure in the Ahe atoll were studied together with their relationships with environmental factors (temperature, salinity, wind) and trophic factors (phytoplankton, bacteria, heterotrophic nanoflagellates (HNF) and ciliates) during three periods in 2008-2009. Meroplankton, mainly bivalve and gastropod larvae, was dominant. Holoplankton was dominated by copepods, the main species being Oithona spp., Paracalanus parvus, Clausocalanus spp., Corycaeus spp., Acartia fossae and Undinula vulgaris. The results suggest a clear wind influence on the structure and horizontal distribution of the zooplankton communities. The metazooplankton appeared to be controlled mainly by food resources, suggesting a bottom-up control. The low nanophytoplankton biomass in contrast to the high abundance of picophytoplankton, HNF and nano-particle grazers (mainly Oithona spp., Paracalanus and bivalve larvae) highlighted the importance of the microbial loop in the food web.

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Section: Hydrobiological Contextsupporting

confidence: 90%

Section: Hydrobiological Contextmentioning

confidence: 74%

Metazooplankton communities in the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia): Spatiotemporal variations and trophic relationships

Pagano

Sagarra

Champalbert

et al. 2012

Marine Pollution Bulletin

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“…Ten years later at the same study site, after mass mortality of young oysters, only 19% lower chl a concentrations within the farming area than outside the farming area were found (Pernet et al 2012), indicating an inverse relationship between oysters and phytoplankton biomass. Other studies, however, have shown, for example, that grazing of cultured pearl oysters decreases the particulate organic carbon but not the phytoplankton biomass (Charpy et al 2012), concluding that pearl oysters graze mainly on non-chlorophyllian particles. Oysters may also consume heterotrophic bacteria, flagellates, and ciliates, as demonstrated by Dupuy et al (2000).…”

Section: Discussionmentioning

confidence: 86%

“…For instance, most studies of the effects of mariculture (shellfish and fish farms) in coastal zones have focused on the feeding regimes of cultured bivalves or fish to determine the organisms that contribute to their diet. Most studies found that bivalves, especially oysters, exerted top-down control on phytoplankton ), but some showed that oysters grazed mainly on non-chlorophyllous particles (Charpy et al 2012) or heterotrophic micro organisms (Dupuy et al 2000). It has been established that fish predation can control the plankton community efficiently, and this biotic top-down control has been used since the 1980s to regulate primary production in lakes (Carpenter et al 1987).…”

Section: Introductionmentioning

confidence: 99%

Microbial food web structural and functional responses to oyster and fish as top predators

Mostajir¹,

Roques²,

Bouvier³

et al. 2015

Mar. Ecol. Prog. Ser.

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The impact of fish and oysters on components of the pelagic microbial food web (MFW) was studied in a 10 d mesocosm experiment using Mediterranean coastal waters. Two mesocosms contained natural water only ('Controls'), 2 contained natural water with Crassostrea gigas ('Oyster'), and 2 contained natural water with Atherina spp. ('Fish'). Abundances and biomasses of microorganisms (viruses, bacteria, phytoplankton, heterotrophic flagellates, and ciliates) were measured to estimate their contribution to the total microbial carbon biomass. Two MFW indices, the microbial autotroph:heterotroph C biomass ratio (A:H) structural index and the gross primary production:respiration ratio (GPP:R) functional index, were defined. In the Fish mesocosms, selective predation on zooplankton led to a trophic cascade with 51% higher phytoplankton C biomass and consequently higher A:H and GPP:R than in the Controls. By the end of the experiment, the Oyster mesocosms had a bacterial C biomass 87% higher and phytoplankton C biomass 93% lower than the Controls, giving significantly lower A:H and GPP:R (<1). Overall, the results showed that wild zooplanktivorous fish had a cascading trophic effect, making the MFW more autotrophic (both indices >1), whereas oyster activities made the MFW more heterotrophic (both indices <1). These MFW indices can therefore be used to assess the impact of multiple local and global forcing factors on the MFW. The results presented here also have implications for sustainable management of coastal environments, suggesting that intense cultivation of filter feeders can be coupled with management to encourage wild local zooplanktivorous fishes to maintain a more resilient system and preserve the equilibrium of the MFW.

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“…As highlighted by Charpy et al (2012), phytoplankton nitrogen requirements in Ahe lagoon cannot be filled only by the available water column nitrogen concentrations and by ocean water inputs. As a consequence, other nitrogen sources involved in the functioning of these ecosystems need to be quantified to explain these systems' productivity.…”

Section: Introductionmentioning

confidence: 99%

Nutrient fluxes between water column and sediments: Potential influence of the pearl oyster culture

Gaertner‐Mazouni

Lacoste

Bodoy³

et al. 2012

Marine Pollution Bulletin

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Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia

Cited by 30 publications

References 27 publications

Metazooplankton communities in the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia): Spatiotemporal variations and trophic relationships

Metazooplankton communities in the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia): Spatiotemporal variations and trophic relationships

Microbial food web structural and functional responses to oyster and fish as top predators

Nutrient fluxes between water column and sediments: Potential influence of the pearl oyster culture

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