An integrative response by Mytilus chilensis to the toxic dinoflagellate Alexandrium catenella

Navarro, Jorge M.; Contreras, Andrea M.

doi:10.1007/s00227-010-1465-x

Cited by 59 publications

(45 citation statements)

References 26 publications

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“…According to Li et al (2002), bivalves fed with A. tamarense produced abnormal feces mixed with white mucus, suggesting the presence of a digestive system disorder affecting AE. Similar observations have been made by Navarro and Contreras (2010) for M. chilensis, for which the lowest AE values occurred during the first day of exposure to a toxic diet, and that nadir coincided with the production of less compact, yellowish-colored feces.…”

Section: Discussionsupporting

confidence: 85%

“…The tanks were constantly aerated, and the seawater was changed every 48 h. Following the acclimation period, one group of clams was exposed to a mixed diet containing the toxic dinoflagellate A. catenella (proportions by weight: 50% A. catenella, 10% T-ISO, and 40% sediment) and another group was exposed to a dinoflagellate-free control diet (60 % T-ISO, 40 % sediment) for 12 days. Given the large amount of laboratory analysis and large individual variability in the physiological responses of bivalves exposed to PSP (Navarro and Contreras 2010), four replicates (8-L tanks, temperature 14°C, salinity 30 PSU) containing 25 clams each were supplied with the toxic diet, whereas three replicates containing the same number of clams were supplied with the control diet (less variable responses). The forth toxic tank was included in the experiment as an extra to be used if necessary, but all the statistical analysis was conducted with three toxic and control aquaria.…”

Section: Experimental Designmentioning

confidence: 99%

“…Lassus et al (2004) reported that the Pacific oyster Crassostrea gigas and the M. arenaria clam reduced their filtration activity when feeding on microalgae containing PSP toxins. Alexandrium catenella exposure is also known to have a negative impact on initial filtration and ingestion in Mytilus chilensis (Navarro and Contreras 2010). Exposure of bivalves to harmful microalgae can also affect their digestion and energy allocation.…”

Section: Introductionmentioning

confidence: 99%

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Enzymatic digestive activity and absorption efficiency in Tagelus dombeii upon Alexandrium catenella exposure

et al. 2013

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We analyzed absorption efficiency (AE) and digestive enzyme activity (amylase, cellulase complex, and laminarinase) of the infaunal bivalve Tagelus dombeii originating from two geographic sites, Corral-Valdivia and Melinka-Aysén, which have different long-term paralytic shellfish poisoning (PSP) exposure rates. We report the effects of past feeding history (origin) on T. dombeii exposed to a mixed diet containing the toxic dinoflagellate Alexandrium catenella and another dinoflagellate-free control diet over a 12-day period in the laboratory. Absorption efficiency values of T. dombeii individuals that experienced PSP exposure in their habitat (Melinka-Aysén) remained unchanged during exposure to toxic food in the laboratory. In contrast, T. dombeii from a non-PSP exposure field site (Corral-Valdivia) showed a significant reduction in AE with toxic exposure time. This study established that the amylase and cellulase complexes were the most important enzymes in the digestive glands of Tagelus from both sites. The temporal evolution of enzymatic activity under toxic diet was fitted to exponential (amylase and cellulase) and to a logarithmic (laminarinase) models. In all fits, we found significant effect of origin in the model parameters. At the beginning of the experiment, higher enzymatic activity was observed for clams from Corral-Valdivia. The amylase activity decreased with time exposure for individuals from Corral and increased for individuals from Melinka. Cellulase activity did not vary over time for clams from Corral, but increased for individuals from Melinka and laminarinase activity decreased over time for individuals from Corral and remained unchanged over time for Melinka. A feeding history of exposure to the dinoflagellate A. catenella was reflected in the digestive responses of both T. dombeii populations.

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Section: Discussionsupporting

confidence: 85%

Section: Experimental Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enzymatic digestive activity and absorption efficiency in Tagelus dombeii upon Alexandrium catenella exposure

et al. 2013

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“…The values for SFG shown in this study were relatively high when compared with those published by others (Navarro & Gonzalez, 1998;Navarro & Contreras, 2010). Negative SFG values indicate that the animals are under severe stress conditions where they do not gain enough energy to survive (Bayne et al, 1985).…”

Section: Discussioncontrasting

confidence: 41%

The Effect of Pollution on Scope for Growth in the Pearl Oyster, Pteria aegyptiaca, in the Gulf of Aqaba, Jordan

Aladaileh¹

2014

IJB

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This experiment was conducted to assess the effects of pollution on both the physiological and energetic characteristics (SFG) of Pteria aegyptiaca in the Gulf of Aqaba, Jordan. Four locations were chosen to represent both contaminated and uncontaminated locations. Phosphate Loading Berth (P) and the Industrial Area (I), represent contaminated locations, whilst the Hotels Area (H) and Marine Science Station (M) represent uncontaminated locations. The results of this experiment showed that contaminated regions had significant effects (P < 0.05) on respiration rate, clearance rate and absorption efficiency. A significant difference (P < 0.05) was identified between the scopes for growth of animals transplanted in contaminated regions compared with animals from uncontaminated locations. The Phosphate Loading Berth (P) and Industrial Area (I), showed the lowest SFG (18.7 ± 4.591 and 35.94 ± 7.412 Jh -1 respectively), reduced to only a half of SFG compared to uncontaminated locations. Results from our study indicate that oysters exposed to contaminated regions are highly compromised in both their energetics and physiology. Failure to improve the environmental conditions in these regions may have catastrophic effects on the micro and macro fauna.

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“…The concentration of toxin in the soft tissue reached values of 642 μg STX eq. 100 g −1 at day eight, with no significant increase throughout the rest of the experimental period (Navarro and Contreras 2010). The goal of the present study was to identify the dynamics of the intoxication and detoxification of juveniles of M. chilensis exposed to a diet containing the dinoflagellate A. catenella.…”

Section: Introductionmentioning

confidence: 90%

Dynamic of intoxication and detoxification in juveniles ofMytilus chilensis(Bivalvia: Mytilidae) exposed to paralytic shellfish toxins

Navarro

Aguila

Machmar

et al. 2011

Aquat. Living Resour.

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-Juveniles of the mussel Mytilus chilensis were exposed to a diet containing paralytic shellfish poisoning (PSP) toxins produced by the dinoflagellate Alexandrium catenella (strain ACC02). The feeding behaviour and the dynamics of intoxication and detoxification were evaluated over an intoxication period of nine days, followed by a detoxification period of eight days. A significant reduction in the feeding activity was measured during the first days of exposure to the PSP toxins (days 0 and 2), followed by a period of recovery observed on days 5 and 9, when the clearance rate of the contaminated mussels significantly increased. During the detoxification period, the contaminated bivalves showed a total recovery of clearance rate, and no significant differences were observed between contaminated and control groups. The intoxication dynamic was characterised by a rapid and sustained increase in the amount of PSP toxins accumulated in the tissues of the bivalves. Due to this increase, the level of PSP toxins critical for human consumption was reached on the first day, and at the end of the intoxication period, the mussels had accumulated 1601 μg STX eq. 100 g −1 tissue. During the detoxification period, a decrease of PSP toxins was observed, down to 319 μg STX eq. 100 g −1 tissue. The lower clearance rates observed over the first days of exposure would produce a decrease in the energy intake and could affect the rate of growth of juveniles. Despite this initial effect, the rapid intoxication capacity of M. chilensis corroborates that this species is a good indicator for the early detection of harmful algal blooms.

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An integrative response by Mytilus chilensis to the toxic dinoflagellate Alexandrium catenella

Cited by 59 publications

References 26 publications

Enzymatic digestive activity and absorption efficiency in Tagelus dombeii upon Alexandrium catenella exposure

Enzymatic digestive activity and absorption efficiency in Tagelus dombeii upon Alexandrium catenella exposure

The Effect of Pollution on Scope for Growth in the Pearl Oyster, Pteria aegyptiaca, in the Gulf of Aqaba, Jordan

Dynamic of intoxication and detoxification in juveniles ofMytilus chilensis(Bivalvia: Mytilidae) exposed to paralytic shellfish toxins

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