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Xu Y, Luo X, Masanja F, Deng Y, Zhao L. Transcriptomic insights into cessation of clam embryonic development following transgenerational exposure to ocean acidity extreme. MARINE ENVIRONMENTAL RESEARCH 2024; 198:106561. [PMID: 38788476 DOI: 10.1016/j.marenvres.2024.106561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 05/06/2024] [Accepted: 05/20/2024] [Indexed: 05/26/2024]
Abstract
Ocean acidity extremes (OAX) events are becoming more frequent and intense in coastal areas in the context of climate change, generating widespread consequences on marine calcifying organisms and ecosystems they support. While transgenerational exposure to end-of-century scenario of ocean acidification (i.e., at pH 7.7) can confer calcifiers resilience, whether and to what extent such resilience holds true under OAX conditions is still poorly understood. Here, we found that transgenerational exposure of Ruditapes philippinarum to OAX resulted in cessation of embryonic development at the trochophore stage, implying devastating consequences of OAX on marine bivalves. We identified a large number of differentially expressed genes in embryos following transgenerationally exposed to OAX, which were mainly significantly enriched in KEGG pathways related to energy metabolism, immunity and apoptosis. These pathways were significantly activated, and genes involved in these processes were up-regulated, indicating strong cellular stress responses to OAX. These findings demonstrate that transgenerational exposure to OAX can result in embryonic developmental cessation by severe cellular damages, implying that transgenerational acclimation maybe not a panacea for marine bivalves to cope with OAX, and hence urgent efforts are required to understand consequences of intensifying OAX events in coastal ecosystems.
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Affiliation(s)
- Yang Xu
- Fisheries College, Guangdong Ocean University, Zhanjiang, China
| | - Xin Luo
- Fisheries College, Guangdong Ocean University, Zhanjiang, China
| | | | - Yuewen Deng
- Fisheries College, Guangdong Ocean University, Zhanjiang, China
| | - Liqiang Zhao
- Fisheries College, Guangdong Ocean University, Zhanjiang, China; Guangdong Science and Technology Innovation Center of Marine Invertebrate, Guangdong Ocean University, Zhanjiang, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, China.
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2
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Caillon C, Pernet F, Lutier M, Di Poi C. Differential reaction norms to ocean acidification in two oyster species from contrasting habitats. J Exp Biol 2023; 226:jeb246432. [PMID: 37942639 DOI: 10.1242/jeb.246432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 11/01/2023] [Indexed: 11/10/2023]
Abstract
Ocean acidification (OA), a consequence of the increase in anthropogenic emissions of carbon dioxide, causes major changes in the chemistry of carbonates in the ocean with deleterious effects on calcifying organisms. The pH/PCO2 range to which species are exposed in nature is important to consider when interpreting the response of coastal organisms to OA. In this context, emerging approaches, which assess the reaction norms of organisms to a wide pH gradient, are improving our understanding of tolerance thresholds and acclimation potential to OA. In this study, we deciphered the reaction norms of two oyster species living in contrasting habitats: the intertidal oyster Crassostrea gigas and the subtidal flat oyster Ostrea edulis, which are two economically and ecologically valuable species in temperate ecosystems. Six-month-old oysters of each species were exposed in common garden tanks for 48 days to a pH gradient ranging from 7.7 to 6.4 (total scale). Both species were tolerant down to a pH of 6.6 with high plasticity in fitness-related traits such as survival and growth. However, oysters underwent remodelling of membrane fatty acids to cope with decreasing pH along with shell bleaching impairing shell integrity and consequently animal fitness. Finally, our work revealed species-specific physiological responses and highlights that intertidal C. gigas seem to have a better acclimation potential to rapid and extreme OA changes than O. edulis. Overall, our study provides important data about the phenotypic plasticity and its limits in two oyster species, which is essential for assessing the challenges posed to marine organisms by OA.
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Affiliation(s)
- Coline Caillon
- Ifremer, Univ Brest, CNRS, IRD, UMR 6539 LEMAR, 29280 Plouzané, France
| | - Fabrice Pernet
- Ifremer, Univ Brest, CNRS, IRD, UMR 6539 LEMAR, 29280 Plouzané, France
| | - Mathieu Lutier
- Ifremer, Univ Brest, CNRS, IRD, UMR 6539 LEMAR, 29280 Plouzané, France
- Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, Blindernveien 31, 0371 Oslo, Norway
| | - Carole Di Poi
- Ifremer, Univ Brest, CNRS, IRD, UMR 6539 LEMAR, 29280 Plouzané, France
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Li Y, Mokrani A, Fu H, Shi C, Li Q, Liu S. Development of Nanopore sequencing-based full-length transcriptome database toward functional genome annotation of the Pacific oyster, Crassostrea gigas. Genomics 2023; 115:110697. [PMID: 37567397 DOI: 10.1016/j.ygeno.2023.110697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 07/28/2023] [Accepted: 08/08/2023] [Indexed: 08/13/2023]
Abstract
The Pacific oyster (Crassostrea gigas) is a widely cultivated shellfish in the world, while its transcriptome diversity remains less unexplored due to the limitation of short reads. In this study, we used Oxford Nanopore sequencing to develop the full-length transcriptome database of C. gigas. We identified 77,920 full-length transcripts from 21,523 genes, and uncovered 9668 alternative splicing events and 87,468 alternative polyadenylation sites. Notably, a total of 16,721 novel transcripts were annotated in this work. Furthermore, integrative analysis of 25 publicly available RNA-seq datasets revealed the transcriptome diversity involved in post-transcriptional regulation in C. gigas. We further developed a Drupal based webserver, Cgtdb, which can be used for transcriptome visualization, sequence alignment, and functional genome annotation analyses. This work provides valuable resources and a useful tool for integrative analysis of various transcriptome datasets in C. gigas, which will serve as an essential reference for functional annotation of the oyster genome.
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Affiliation(s)
- Yin Li
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, and College of Fisheries, Ocean University of China, Qingdao 266003, China
| | - Ahmed Mokrani
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, and College of Fisheries, Ocean University of China, Qingdao 266003, China
| | - Huiru Fu
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, and College of Fisheries, Ocean University of China, Qingdao 266003, China
| | - Chenyu Shi
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, and College of Fisheries, Ocean University of China, Qingdao 266003, China
| | - Qi Li
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, and College of Fisheries, Ocean University of China, Qingdao 266003, China
| | - Shikai Liu
- Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, and College of Fisheries, Ocean University of China, Qingdao 266003, China.
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Lutier M, Pernet F, Di Poi C. Pacific oysters do not compensate growth retardation following extreme acidification events. Biol Lett 2023; 19:20230185. [PMID: 37582403 PMCID: PMC10427192 DOI: 10.1098/rsbl.2023.0185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 07/27/2023] [Indexed: 08/17/2023] Open
Abstract
Ocean acidification caused by anthropogenic carbon dioxide emissions alters the growth of marine calcifiers. Although the immediate effects of acidification from global ocean models have been well studied on calcifiers, their recovery capacity over a wide range of pH has never been evaluated. This aspect is crucial because acidification events that arise in coastal areas can far exceed global ocean predictions. However, such acidification events could occur transiently, allowing for recovery periods during which the effects on growth would be compensated, maintained or amplified. Here we evaluated the recovery capacity of a model calcifier, the Pacific oyster Crassostrea gigas. We exposed juveniles to 15 pH conditions between 6.4 and 7.8 for 14 days. Oyster growth was retarded below pH 7.1 while shells were corroded at pH 6.5. We then placed the oysters under ambient pH > 7.8 for 42 days. Growth retardation persisted at pH levels below pH 7.1 even after the stress was removed. However, despite persistent retardation, growth has resumed rapidly suggesting that the oysters can recover from extreme acidification. Yet we found that the differences in individual weight between pH conditions below 7.1 increased over time, and thus the growth retardation cannot be compensated and may affect the fitness of the bivalves.
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Affiliation(s)
- Mathieu Lutier
- Ifremer, Univ Brest, CNRS, IRD, UMR 6539, LEMAR, Argenton-en-Landunvez, France
| | - Fabrice Pernet
- Ifremer, Univ Brest, CNRS, IRD, UMR 6539, LEMAR, Argenton-en-Landunvez, France
| | - Carole Di Poi
- Ifremer, Univ Brest, CNRS, IRD, UMR 6539, LEMAR, Argenton-en-Landunvez, France
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Li C, Wang Y, Wei M, Wang X. The involvement of a novel calmodulin-like protein isoform from oyster Crassostrea gigas in transcription factor regulation provides new insight into acclimation to ocean acidification. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 257:106423. [PMID: 36822075 DOI: 10.1016/j.aquatox.2023.106423] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 02/06/2023] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
Marine organisms need to adapt to improve organismal fitness under ocean acidification (OA). Recent studies have shown that marine calcifiers can achieve acclimation by stimulating calcium binding/signaling pathways. Here, a CaM-like gene (CgCaLP-2) from oyster Crassostrea gigas which typically responded to long-term CO2 exposure (two months) rather than short-term exposure (one week) was characterized. The cloned cDNA was 678 bp and was shorter than the retrieved sequence from NCBI (1125 bp). The two sequences, designated as CgCaLP-2-v1 and CgCaLP-2-v2, were demonstrated to be different splice variants by the genome sequence analysis. Western blotting analysis revealed two bands of 23 kD and 43 kD in mantle and hemocytes, corresponding to predicted molecular weight of CgCaLP-2-v1 and CgCaLP-2-v2, respectively. The isoform CgCaLP-2-v1 (the 23 kD band) was highly stimulated in response to long-term CO2 exposure (42-day and 56-day treatment) in hemocytes and mantle tissue. The fluorescence signal of CgCaLP-2 in mantle and hemocytes became more intensive after long-term CO2 exposure. Besides, in hemocytes, CgCaLP-2 presented a higher localization on the nuclear membrane after long-term CO2 exposure (56 d). The target gene network of CgCaLP-2 was predicted, and a transcription factor (TF) gene annotated as Homeobox protein SIX4 (CgSIX4) showed a similar expressive trend to CgCaLP-2 during CO2 exposure. Suppression of CgCaLP-2 via RNA interference significantly reduced the mRNA expression of CgSIX4. The results suggested that CgCaLP-2 might mediate the Ca2+-CaLP-TF signal transduction pathway under long-term CO2 exposure. This study serves as an example to reveal that alternative splicing is an important mechanism for generation multiple protein isoforms and thus shape the plastic responses under CO2 exposure, providing new insight into the potential acclimation ability of marine calcifiers to future OA.
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Affiliation(s)
- Changmei Li
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Yilin Wang
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Manman Wei
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Xiudan Wang
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China.
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Schwaner C, Barbosa M, Schwemmer TG, Pales Espinosa E, Allam B. Increased Food Resources Help Eastern Oyster Mitigate the Negative Impacts of Coastal Acidification. Animals (Basel) 2023; 13:ani13071161. [PMID: 37048417 PMCID: PMC10093323 DOI: 10.3390/ani13071161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/11/2023] [Accepted: 03/23/2023] [Indexed: 03/29/2023] Open
Abstract
Oceanic absorption of atmospheric CO2 results in alterations of carbonate chemistry, a process coined ocean acidification (OA). The economically and ecologically important eastern oyster (Crassostrea virginica) is vulnerable to these changes because low pH hampers CaCO3 precipitation needed for shell formation. Organisms have a range of physiological mechanisms to cope with altered carbonate chemistry; however, these processes can be energetically expensive and necessitate energy reallocation. Here, the hypothesis that resilience to low pH is related to energy resources was tested. In laboratory experiments, oysters were reared or maintained at ambient (400 ppm) and elevated (1300 ppm) pCO2 levels during larval and adult stages, respectively, before the effect of acidification on metabolism was evaluated. Results showed that oysters exposed to elevated pCO2 had significantly greater respiration. Subsequent experiments evaluated if food abundance influences oyster response to elevated pCO2. Under high food and elevated pCO2 conditions, oysters had less mortality and grew larger, suggesting that food can offset adverse impacts of elevated pCO2, while low food exacerbates the negative effects. Results also demonstrated that OA induced an increase in oyster ability to select their food particles, likely representing an adaptive strategy to enhance energy gains. While oysters appeared to have mechanisms conferring resilience to elevated pCO2, these came at the cost of depleting energy stores, which can limit the available energy for other physiological processes. Taken together, these results show that resilience to OA is at least partially dependent on energy availability, and oysters can enhance their tolerance to adverse conditions under optimal feeding regimes.
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Dang X, Huang Q, He YQ, Gaitán-Espitia JD, Zhang T, Thiyagarajan V. Ocean acidification drives gut microbiome changes linked to species-specific immune defence. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 256:106413. [PMID: 36801178 DOI: 10.1016/j.aquatox.2023.106413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 12/10/2022] [Accepted: 01/28/2023] [Indexed: 06/18/2023]
Abstract
Ocean acidification (OA) has important effects on the intrinsic phenotypic characteristics of many marine organisms. Concomitantly, OA can alter the extended phenotypes of these organisms by perturbing the structure and function of their associated microbiomes. It is unclear, however, the extent to which interactions between these levels of phenotypic change can modulate the capacity for resilience to OA. Here, we explored this theoretical framework assessing the influence of OA on intrinsic (immunological responses and energy reserve) and extrinsic (gut microbiome) phenotypic characteristics and the survival of important calcifiers, the edible oysters Crassostrea angulata and C. hongkongensis. After one-month exposure to experimental OA (pH 7.4) and control (pH 8.0) conditions, we found species-specific responses characterised by elevated stress (hemocyte apoptosis) and decreased survival in the coastal species (C. angulata) compared with the estuarine species (C. hongkongensis). Phagocytosis of hemocytes was not affected by OA but in vitro bacterial clearance capability decreased in both species. Gut microbial diversity decreased in C. angulata but not in C. hongkongensis. Overall, C. hongkongensis was capable of maintaining the homeostasis of the immune system and energy supply under OA. In contrast, C. angulata's immune function was suppressed, and the energy reserve was imbalanced, which might be attributed to the declined microbial diversity and the functional loss of essential bacteria in the guts. This study highlights a species-specific response to OA determined by genetic background and local adaptation, shedding light on the understanding of host-microbiota-environment interactions in future coastal acidification.
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Affiliation(s)
- Xin Dang
- The Swire Institute of Marine Science, School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region, China.
| | - Qi Huang
- The Swire Institute of Marine Science, School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region, China; Department of Civil Engineering, Environmental Microbiome Engineering and Biotechnology Lab, The University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Yuan-Qiu He
- The Swire Institute of Marine Science, School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Juan Diego Gaitán-Espitia
- The Swire Institute of Marine Science, School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Tong Zhang
- Department of Civil Engineering, Environmental Microbiome Engineering and Biotechnology Lab, The University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Vengatesen Thiyagarajan
- The Swire Institute of Marine Science, School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region, China.
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Wang X, Li C, Lv Z, Zhang Z, Qiu L. A calcification-related calmodulin-like protein in the oyster Crassostrea gigas mediates the enhanced calcium deposition induced by CO 2 exposure. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 833:155114. [PMID: 35413345 DOI: 10.1016/j.scitotenv.2022.155114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/19/2022] [Accepted: 04/04/2022] [Indexed: 06/14/2023]
Abstract
Calcium transportation and homeostasis are essential for marine bivalves to maintain basic metabolism and build their shells. Calmodulin-like proteins (CaLPs) are important calcium sensors and buffers and can respond to ocean acidification (OA) in marine calcifiers. However, no further study of their physiological function in calcium metabolism under elevated CO2 has been performed. Here, we identified a novel CaLP (designated CgCaLP) in the Pacific oyster Crassostrea gigas and demonstrated its participation in the calcification process: the mRNA expression level of CgCaLP peaked at the trochophore larval stage and remained high at stages when shells were shaped; the mRNA and protein of CgCaLP were more highly expressed in mantle tissue than in other tissues. Under elevated CO2 levels, the protein expression level of CgCaLP in hemocytes increased, while in contrast, significantly decreased protein levels were detected in gill and mantle tissues. Shell dissolution caused the imbalance of calcium in hemocytes and decreased calcium absorption and transportation demand in gill and mantle tissues, inducing the molecular function allocation of CgCaLP under CO2 exposure. Despite the decreased protein level in mantle tissue, CgCaLP was found to translocate to outer mantle epithelium (OME) cells where condensed calcium-rich deposits (CRDs) were detected. We further demonstrated that CgCaLP mRNA and protein expression levels could respond to seawater Ca2+ availability, suggesting that the calcium deposition capacity of oysters might be enhanced to fight against shell dissolution problems and that CgCaLP might serve as an essential participator of the process. In summary, CgCaLP might enhance calcium deposition under CO2 exposure and thus play a significant and flexible molecular function involved in a compensation strategy of oysters to fight against the acidified ocean.
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Affiliation(s)
- Xiudan Wang
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
| | - Changmei Li
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhao Lv
- Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, Hunan Agricultural University, Changsha 410128, China
| | - Zhenqiang Zhang
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Limei Qiu
- CAS and Shandong Province Key Laboratory of Experimental Marine Biology, CAS Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China.
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Tallec K, Gabriele M, Paul-Pont I, Alunno-Bruscia M, Huvet A. Tire rubber chemicals reduce juvenile oyster (Crassostrea gigas) filtration and respiration under experimental conditions. MARINE POLLUTION BULLETIN 2022; 181:113936. [PMID: 35850084 DOI: 10.1016/j.marpolbul.2022.113936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 07/04/2022] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
Tires can release a large number of chemical compounds that are potentially hazardous for aquatic organisms. An ecophysiological system was used to do high-frequency monitoring of individual clearance, respiration rates, and absorption efficiency of juvenile oysters (8 months old) gradually exposed to four concentrations of tire leachates (equivalent masses: 0, 1, 10, and 100 μg tire mL-1). Leachates significantly reduced clearance (52 %) and respiration (16 %) rates from 1 μg mL-1, while no effect was observed on the absorption efficiency. These results suggest that tire leachates affect oyster gills, which are the organ of respiration and food retention as well as the first barrier against contaminants. Calculations of scope for growth suggested a disruption of the energy balance with a significant reduction of 57 %. Because energy balance directs whole-organism functions (e.g., growth, reproductive outputs), the present study calls for an investigation of the long-term consequences of chemicals released by tires.
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Affiliation(s)
- Kevin Tallec
- Univ Brest, Ifremer, CNRS, IRD, LEMAR, F-29280 Plouzané, France.
| | - Marta Gabriele
- Università di Pisa, Lungarno Pacinotti 43, 56126 Pisa, Italy
| | - Ika Paul-Pont
- Univ Brest, Ifremer, CNRS, IRD, LEMAR, F-29280 Plouzané, France
| | | | - Arnaud Huvet
- Univ Brest, Ifremer, CNRS, IRD, LEMAR, F-29280 Plouzané, France
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