Physiological responses to copper in giant clams: a comparison of two methods in revealing effects on photosynthesis in zooxanthellae

Elfwing, Tina; Blidberg, Eva; Tedengren, Michael

doi:10.1016/s0141-1136(02)00100-9

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…This will affect the ability of zooxanthellae to perform photosynthesis. Some reports indicate a decline in the rate of photosynthesis as a result of changes in water quality parameters (Elfwing et al, 2002;Owen et al, 2002). This condition will affect the corals due to the decreasing amount of energy that can be translocated.…”

Section: Resultsmentioning

confidence: 99%

“…Various changes in the zooxanthellae, will affect the rate of photosynthesis of algae (Elfwing et al, 2002;Owen et al, 2002). In the event of a decrease in the rate of photosynthesis, it will also decrease the amount of energy that is translocated by zooxanthellae to the host (Edmunds and Davies, 1986) and affect the growth rate of the host.…”

Section: Introductionmentioning

confidence: 99%

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Are Zooxanthellae Really Sensitive? Response of Zooxanthellae Size Exposed to Several Pollutants

Ambariyanto

Ko'ou

2017

Indo. J. Mar. Sci.

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Pollution is one of the important issues faced by marine resources including zooxanthellae, which is known to be very sensitive to environmental changes. Some pollutants have been reported to have adverse effects on zooxanthellae, however, their sensitivity in regards to changes on cell size of these algae has not been widely explored. This study examined the effects of pollutants on the sensitivity of zooxanthellae through changes in size. Zooxanthellae were isolated from corals Porites lutea, Acropora aspera, and Montipora digitata collected from Panjang Island, Jepara, Indonesia. These algae were exposed to pollutants i.e. heavy metals (Cu, Cd, Pb) and nutrients (ammonium and phosphate) at concentrations of 5,10,15 ppb and 5,10,15 μM, respectively. Zooxanthellae size were measured five hours after pollutants exposure. The results showed that all treatments reduced the size of zooxanthellae. Algae isolated from P. lutea are the least affected by pollutants and the highest percentage cell size reduction was found in phosphate treatment. However, reduction on the size of algae were not statistically significant. These results indicate that in relation to reduction in the size, zooxanthellae are not sensitive to pollutants. Keywords: Zooxanthellae, pollutants, sensitivity, size reduction

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Are Zooxanthellae Really Sensitive? Response of Zooxanthellae Size Exposed to Several Pollutants

Ambariyanto

Ko'ou

2017

Indo. J. Mar. Sci.

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“…These mixotrophic organisms acquire nutrients from heterotrophic (via seawater filtration) and symbionts photo-autotrophic pathways (Klumpp et al, 1992; Hawkins and Klumpp, 1995). Nutrients provided by symbionts (such as glucose, Ishikura et al, 1999) may account for a major part of the clam energy needs depending on the species and life stage (Trench et al, 1981; Klumpp et al, 1992; Klumpp and Lucas, 1994; Klumpp and Griffits, 1994; Hawkins and Klumpp, 1995; Elfwing et al, 2002; Yau and Fan, 2012; Holt et al, 2014; Soo and Todd, 2014). Like symbiotic coral species, bleaching events affecting giant clam have been recorded several times in the Indo-Pacific Ocean (Adessi, 2001; Buck et al, 2002; Leggat et al, 2003; Andréfouët et al, 2013; Junchompoo et al, 2013) mainly due to seawater temperature increase by a few degrees above the seasonal maximum (Adessi, 2001; Andréfouët et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature andpCO₂on the respiration, biomineralization and photophysiology of the giant clamTridacna maxima

Brahmi

Chapron

Moullac

et al. 2019

Preprint

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Such as many other reef organisms, giant clams are today confronted to global change effects and can suffer mass bleaching or mortality events mainly related to abnormally high seawater temperatures. Despite its strong ecological and socio-economical importance, its responses to the two most alarming threats linked to global change (i.e., ocean warming and acidification) still need to be explored. We investigated physiological responses of 4-years-old Tridacna maxima specimens to realistic levels of temperature and partial pressure of carbon dioxide (pCO2) (+1.5°C and +800 μatm of CO2) predicted for 2100 in French Polynesian lagoons during the warmer season. During a 65-days crossed-factor experiment, individuals were exposed to two temperatures (29.2°C; 30.7°C) and two pCO2 (430 µatm; 1212 µatm) conditions. Impact of each parameter and their potential synergetic effect were evaluated on respiration, biomineralization and photophysiology. Kinetics of thermal and acidification stress were evaluated by performing measurements at different times of exposure (29, 41, 53, 65 days). At 30.7°C, the holobiont O2 production, symbiont photosynthetic yield, and density were negatively impacted. High pCO2 had a significant negative effect on shell growth rate, symbiont photosynthetic yield and density. Shell microstructural modifications were observed from 41 days in all temperature and pCO2 conditions. No significant synergetic effect was found. Today thermal conditions (29.2°C) appeared to be sufficiently stressful to induce a host acclimatization process. All these observations indicate that temperature and pCO2 are both forcing variables affecting T. maxima physiology and jeopardize its survival under environmental conditions predicted for the end of this century.

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“…Error bars represent SE, n = 6 more pronounced salinity drops. Ecotoxicological studies on clams have mostly been carried out on juveniles (Blidberg et al 1999;Elfwing et al 2002), where both copper (5 μg Cu2 + l −1 ) and low salinity have been shown to be sub lethal but negatively affect the physiological performance. However, copper concentrations much higher than this has been reported in reef waters (Peters et al 1997).…”

Section: Discussionmentioning

confidence: 99%

Effects of copper on development and survival rate of Paphia malabarica Chemnitz larvae under low saline condition

Raghavan

Gopinathan

2008

Environ Monit Assess

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Venerid clam, Paphia malabaricaChemnitz, is the commercially exploited species distributed exclusively in Vembanad Lake and Ashtamudi estuary, along the south west coast of India. In this study, the survival rate and development of P. malabarica larvae were studied for 3 days in ambient salinity (33), copper (2.5 μg Cu 2+ l −1 ), reduced salinities (25 and 20) and a combination of copper in low salinities. No significant differences were found in larval development between treatments. The survival rates decreased considerably with low salinities although the combination of copper and low salinity gave synergistic effects. The reduced survival in low salinities would limit population growth of this species in estuarine areas experiencing low salinities and also explains the absence of larval settlement on habitats close to harbors or river mouths.

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Physiological responses to copper in giant clams: a comparison of two methods in revealing effects on photosynthesis in zooxanthellae

Cited by 12 publications

References 20 publications

Are Zooxanthellae Really Sensitive? Response of Zooxanthellae Size Exposed to Several Pollutants

Are Zooxanthellae Really Sensitive? Response of Zooxanthellae Size Exposed to Several Pollutants

Effects of temperature andpCO₂on the respiration, biomineralization and photophysiology of the giant clamTridacna maxima

Effects of copper on development and survival rate of Paphia malabarica Chemnitz larvae under low saline condition

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Physiological responses to copper in giant clams: a comparison of two methods in revealing effects on photosynthesis in zooxanthellae

Cited by 12 publications

References 20 publications

Are Zooxanthellae Really Sensitive? Response of Zooxanthellae Size Exposed to Several Pollutants

Are Zooxanthellae Really Sensitive? Response of Zooxanthellae Size Exposed to Several Pollutants

Effects of temperature andpCO2on the respiration, biomineralization and photophysiology of the giant clamTridacna maxima

Effects of copper on development and survival rate of Paphia malabarica Chemnitz larvae under low saline condition

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Effects of temperature andpCO₂on the respiration, biomineralization and photophysiology of the giant clamTridacna maxima