Seawater temperature, Gambierdiscus spp. variability and incidence of ciguatera poisoning in French Polynesia

Harmful Algae ◽  
2005 ◽  
Vol 4 (6) ◽  
pp. 1053-1062 ◽  
Author(s):  
Marie-Ludivine Chateau-Degat ◽  
Mireille Chinain ◽  
Nicole Cerf ◽  
Suzanne Gingras ◽  
Bruno Hubert ◽  
...  
Keyword(s):  
Seawater Temperature ◽  
French Polynesia

scholarly journals Identifying conserved molecular mechanisms of thermo-acclimation in symbiotic organisms

2018 ◽  
Author(s):  
Homere J. Alves Monteiro ◽  
Chloe Brahmi ◽  
Anderson Blair Mayfield ◽  
Jeremie Vidal-Dupiol ◽  
Bruno Lapeyre ◽  
...  
Keyword(s):  
High Temperatures ◽  
Molecular Mechanisms ◽  
Seawater Temperature ◽  
French Polynesia ◽  
Giant Clam ◽  
Pocillopora Damicornis ◽  
Free Living ◽  
Module Preservation ◽  
Tridacna Maxima ◽  
Symbiotic Organisms

Seawater temperature rise in French Polynesia has repeatedly resulted in symbiosis breakdown between giant clam (Tridacna maxima) and dinoflagellates (Symbiodinium spp.), particularly in small individuals. Herein, we explored the physiological and gene expression responses of the clam hosts and their photosynthetically active symbionts over a 65-day experiment in which clams were exposed to either normal or environmentally relevant elevated seawater temperatures. These data were combined with publicly available data for both free-living Symbiodinium (clades C1 and F) and Symbiodinium spp. in hospite with the coral Pocillopora damicornis. Gene module preservation analysis revealed that the function of the symbionts' photosystem II was impaired at high temperatures, and this response was conserved across all holobionts and Symbiodinium clades examined. Similarly, activation of the phytohormone abscisic acid signaling and epigenetics modulation appeared to be a key response mechanisms for symbionts in hospite with giant clams exposed to high temperatures and also distinguish thermo-tolerant from thermo-sensitive Symbiodinium C1 phenotypes.

scholarly journals Different nitrogen sources speed recovery from corallivory and uniquely alter the microbiome of a reef-building coral

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e8056 ◽  
Author(s):  
Mallory M. Rice ◽  
Rebecca L. Maher ◽  
Rebecca Vega Thurber ◽  
Deron E. Burkepile
Keyword(s):  
Microbial Community ◽  
Nitrogen Source ◽  
Nutrient Loading ◽  
Seawater Temperature ◽  
French Polynesia ◽  
Ocean Warming ◽  
Coral Growth ◽  
Coral Host ◽  
Coral Microbiome ◽  
Algal Symbiont

Corals are in decline worldwide due to local anthropogenic stressors, such as nutrient loading, and global stressors, such as ocean warming. Anthropogenic nutrient loading, which is often rich in nitrate, inhibits coral growth and worsens corals’ response to warming while natural sources of nitrogen, such as ammonium from fish excretion, promotes coral growth. Although the effects of nutrient loading and ocean warming have been well-studied, it remains unclear how these factors may interact with biotic processes, such as corallivory, to alter coral health and the coral microbiome. This study examined how nitrate vs. ammonium enrichment altered the effects of increased seawater temperature and simulated parrotfish corallivory on the health of Pocillopora meandrina and its microbial community. We tested the effects of nitrogen source on the response to corallivory under contrasting temperatures (control: 26 °C, warming: 29 °C) in a factorial mesocosm experiment in Moorea, French Polynesia. Corals were able to maintain growth rates despite simultaneous stressors. Seawater warming suppressed wound healing rates by nearly 66%. However, both ammonium and nitrate enrichment counteracted the effect of higher temperatures on would healing rates. Elevated seawater temperature and ammonium enrichment independently increased Symbiodiniaceae densities relative to controls, yet there was no effect of nitrate enrichment on algal symbiont densities. Microbiome variability increased with the addition of nitrate or ammonium. Moreover, microbial indicator analysis showed that Desulfovibrionaceae Operational taxonomic units (OTUs) are indicators of exclusively temperature stress while Rhodobacteraceae and Saprospiraceae OTUs were indicators of high temperature, wounding, and nitrogen enrichment. Overall, our results suggest that nitrogen source may not alter the response of the coral host to simultaneous stressors, but that the associated microbial community may be distinct depending on the source of enrichment.

Elastase inhibitors and cancer preventive potential agents from Calophyllum inophyllum (L.) grown in French Polynesia

Planta Medica ◽  
2009 ◽  
Vol 75 (09) ◽  
Author(s):  
T Leu ◽  
S Soulet ◽  
G Herbette ◽  
R Faure ◽  
JP Bianchini ◽  
...  
Keyword(s):  
French Polynesia ◽  
Calophyllum Inophyllum

First record of the superfamily Proctotrupoidea from French Polynesia (Hymenoptera)

2020 ◽  
Vol 125 (4) ◽  
pp. 404-406
Author(s):  
Thibault Ramage
Keyword(s):  
First Record ◽  
French Polynesia ◽  
Society Islands ◽  
First Time

A Helorid wasp, Helorus ruficornis Förster, 1856, is reported for the first time on Tahiti (Society Islands), which is also the first record of both Proctotrupoidea and family Heloridae in French Polynesia. The potential hosts of Helorus ruficornis in French Polynesia are discussed.

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