scholarly journals Assessing the effects of increasing surface seawater temperature on black pearl production in French Polynesia: A bioeconomic simulation

2021 ◽  
Vol 181 ◽  
pp. 106914
Author(s):  
Jana Hilsenroth ◽  
Kelly A. Grogan ◽  
Thomas K. Frazer
Keyword(s):  
Seawater Temperature ◽  
French Polynesia ◽  
Surface Seawater ◽  
Black Pearl

scholarly journals Transmit the heat of rivers to surface seawater

2021 ◽  
Vol 276 ◽  
pp. 01010
Author(s):  
Dongfang Yang ◽  
Linzhen Wei ◽  
Ming Feng ◽  
Shengjun Zhang ◽  
Danfeng Yang
Keyword(s):  
Water Temperature ◽  
Coastal Waters ◽  
Seawater Temperature ◽  
Jiaozhou Bay ◽  
Water Area ◽  
Interval Length ◽  
Surface Seawater ◽  
Temperature Changes ◽  
The North ◽  
Temperature Area

Based on the survey materials of the waters of Jiaozhou Bay in April and August 1981, this article studies the water temperature and horizontal distribution in the surface waters of Jiaozhou Bay. The results have showed that the water temperature ranged within 7.52–30.90°C in April and August, and the length of interval of water temperature was 23.38°C. The water temperature of the ocean was above 7.00°C. It indicated that the water temperature of the entire water body of Jiaozhou Bay was relatively high in April and August, in terms of the changes of water temperature. In April, the water temperature in the water body of Jiaozhou Bay ranged within 7.52–13.70°C, and the length of temperature interval was 6.18°C. In Jiaozhou Bay, from the northeastern coastal waters along the northern coastal waters to the northwestern coastal waters, the range of water temperature changes was 12.82–13.70°C, and the interval length of seawater temperature changes was 0.88°C. From the northern area to the southern area, the range of water temperature changes was 7.52–13.70°C, and the interval length of seawater temperature was 6.18°C. In August, the range of water temperature changes was 24.60–30.90°C, and the interval length of seawater temperature was 6.30°C. In the eastern area of Jiaozhou Bay, the water temperature in the coastal waters of the estuary of Jiaozhou Bay was 30.90°C, forming a high temperature area. In the coastal waters of Jiaozhou Bay from the northwest to the north, the range of water temperature changes was 27.32–27.37°C and the interval length of seawater temperature was 0.05°C. In April and August, the increase of water temperature in the coastal waters from the northeast along the north to the northwest of Jiaozhou Bay was mainly caused by the shortwave radiation from the sun and sky and the longwave radiation from the atmosphere which continuously offered heat to the seawater. In April, it formed a circular water area with low temperature centered with the central water area of Jiaozhou Bay, whose water temperature ranged within 7.52–8.51°C. Thus, there was no heat source to provide heat to the central waters of Jiaozhou Bay, resulting a loop-locked low water temperature area in the center of the bay. In August, in the eastern part of Jiaozhou Bay, that is, the coastal waters in the estuary of Haibo River, the water temperature reached a relatively high value, 30.90°C. The source of the increase in water temperature was the transportation of heat from Haibo River, which transferred the heat of the river to the surface seawater.

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.

Biodegradation of shells of the black pearl oyster, Pinctada margaritifera var. cumingii, by microborers and sponges of French Polynesia

1996 ◽  
Vol 126 (3) ◽  
pp. 509-519 ◽  
Author(s):  
L. Mao Che ◽  
T. Le Campion-Alsumard ◽  
N. Boury-Esnault ◽  
C. Payri ◽  
S. Golubic ◽  
...  
Keyword(s):  
French Polynesia ◽  
Pearl Oyster ◽  
Pinctada Margaritifera ◽  
Black Pearl

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 Annual variations of the presence of Nereididae (Annelida: Polychaeta) from intertidal rocky shores along the east coast of Algeria

Check List ◽  
2015 ◽  
Vol 11 (6) ◽  
pp. 1808
Author(s):  
Zoubeida Meghlaoui ◽  
Tarek Daas ◽  
Meriem Snani ◽  
Ouided Daas-Maamcha ◽  
Patrick Scaps
Keyword(s):  
Rocky Shore ◽  
East Coast ◽  
Seawater Temperature ◽  
Early Spring ◽  
The Other ◽  
Late Winter ◽  
Rocky Shores ◽  
Surface Seawater ◽  
Sea Temperature ◽  
Annual Variations

Four species of nereidid polychaetes, Peri­ner­eis cultrifera, P. macropus, Nereis falsa, and Platy­ner­eis dumerilii, were identified during three years in four intertidal rocky shore sites (El-Kala, Annaba, Skikda and Collo) along the east coast of Algeria during the years 2011–2013. Species’ distribution fluctuated according to sites and season. Perinereis cultrifera was observed during most of the year, except in summer. Perinereis macropus was observed at El-Kala, Skikda and Collo mainly in late winter and early spring. Nereis falsa was observed during most of the year in El-Kala and Annaba; this species was also observed in Skikda in 2011 but then disappeared in the last two years of this study. Finally, the presence of P. dumerilii was noticed only in El-Kala for a few months (mainly in March and April). Perinereis cultrifera, P. macropus and P. dumerilii reproduce after acquiring the epitokous form between April and May, when surface seawater temperature starts rising. The largest mature oocytes were about the same for P. cultrifera (279 µm) and P. macropus (278 µm), while this value was smaller for P. dumerilii (166 µm). In contrast to the other three species of nereidid polychaetes, N. falsa reproduces without epitokal modification between July and August when sea temperature was highest. The largest mature oocytes (168 µm) are about the same as P. dumerilii but is much small than those of P. cultrifera and P. macropus. 

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.

scholarly journals Red Tide Events and Seasonal Variations in the Partial Pressure of CO2 and Related Parameters in Shellfish-Farming Bays, Southeastern Coast of Korea

2021 ◽  
Vol 8 ◽  
Author(s):  
JeongHee Shim ◽  
Mi-Ju Ye ◽  
Jae-Hyun Lim ◽  
Jung-No Kwon ◽  
Jeong Bae Kim
Keyword(s):  
Carbon Cycle ◽  
Partial Pressure ◽  
Bottom Water ◽  
Red Tide ◽  
Seawater Temperature ◽  
Spatiotemporal Variability ◽  
Red Tides ◽  
Surface Seawater ◽  
Biological Production ◽  
The Mean

Mixed results have been reported on the evaluation of the coastal carbon cycle and its contribution to the global carbon cycle, mainly due to the shortage of observational data and the considerable spatiotemporal variability arising from complex biogeochemical factors. In this study, the partial pressure of carbon dioxide (pCO2) and related environmental factors were measured in the Jinhae–Geoje–Tongyeong bay region of the southeastern Korean Peninsula in February 2014, August 2014, April 2015, and October 2015. The mean pCO2 of surface seawater ranged from 215 to 471 μatm and exhibited a high correlation with the surface seawater temperature when data for August were excluded (R2 = 0.69), indicating that the seasonal variation in CO2 could be largely attributed to the variation in seawater temperature. However, a severe red tide event occurred in August 2014, when the lowest pCO2 value was observed despite a relatively high seawater temperature. It is considered that the active biological production of phytoplankton related to red tides counteracted the summer increase in pCO2. Based on the correlation between pCO2 and temperature, the estimated decrease in pCO2 caused by non-thermal factors was approximately 200 μatm. During the entire study period, the air–sea CO2 flux ranged from −14.2 to 3.7 mmol m–2 d–1, indicating that the study area served as an overall sink for atmospheric CO2, and only functioned as a weak source during October. The mean annual CO2 flux estimated from the correlation with temperature was −5.1 mmol m–2 d–1. However, because this estimate did not include reductions caused by sporadic events of biological production, such as red tides and phytoplankton blooms, the actual uptake flux is considered to be higher. The mean saturation state (ΩAr) value of carbonate aragonite was 2.61 for surface water and 2.04 for bottom water. However, the mean ΩAr of bottom water was <2 in August and October, and the ΩAr values measured at some of the bottom water stations in August were <1. Considering that the period from August to October corresponds to the reproduction and growth stages of shellfish, such low ΩAr values could be very damaging to shellfish production and the aquaculture industry.

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