Effects of short-term hypoxia and seawater acidification on hemocyte responses of the mussel Mytilus coruscus

Sui, Yanming; Kong, Hui; Shang, Yingxin; Huang, Xizhi; Wu, Fuyong; Hu, Menghong; Lin, Daohui; Lu, Wei; Wang, Youji

doi:10.1016/j.marpolbul.2016.05.001

Cited by 57 publications

(27 citation statements)

References 56 publications

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“…This could suggest that mussels exposed to hypoxia need more MBP13 to eliminate the oxygen-mediated free radicals. This is supported by our previous observation that M. coruscus produced more oxygen-mediated free radicals when exposed to seawater acidification and hypoxia (Sui et al, 2016b). …”

Section: Discussionsupporting

confidence: 81%

“…In addition, CO 2 -driven seawater acidification has been demonstrated to affect internal bicarbonate homeostasis, acid-base regulation as well as energy metabolism in many marine animals (Melzner et al, 2009; Hu et al, 2011, 2013, 2014a,b, 2016a,b; Stumpp et al, 2012a,b). The thick shell mussel Mytilus coruscus has been shown to produce more ROS under OA (Sui et al, 2016b). However, OA did not severely affect Mytilus galloprovincialis although reduced growth rates, lower acid-base regulation capacities and damage of the periostracum cover were found especially in summer when mussels are exposed to elevated temperature (Gazeau et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies, we have investigated the energy budget and haemocyte responses of M. coruscus under simultaneous seawater acidification and hypoxia. We have shown that both stressors can negatively impact their physiology and immune response (Sui et al, 2016a,b). However, the mechanism and other aspects of the defense responses of mussels exposed to combined low pH and DO are still unclear.…”

Section: Introductionmentioning

confidence: 99%

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Defense Responses to Short-term Hypoxia and Seawater Acidification in the Thick Shell Mussel Mytilus coruscus

et al. 2017

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The rising anthropogenic atmospheric CO2 results in the reduction of seawater pH, namely ocean acidification (OA). In East China Sea, the largest coastal hypoxic zone was observed in the world. This region is also strongly impacted by ocean acidification as receiving much nutrient from Changjiang and Qiantangjiang, and organisms can experience great short-term natural variability of DO and pH in this area. In order to evaluate the defense responses of marine mussels under this scenario, the thick shell mussel Mytilus coruscus were exposed to three pH/pCO2 levels (7.3/2800 μatm, 7.7/1020 μatm, 8.1/376 μatm) at two dissolved oxygen concentrations (DO, 2.0, 6.0 mg L−1) for 72 h. Results showed that byssus thread parameters, such as the number, diameter, attachment strength and plaque area were reduced by low DO, and shell-closing strength was significantly weaker under both hypoxia and low pH conditions. Expression patterns of genes related to mussel byssus protein (MBP) were affected by hypoxia. Generally, hypoxia reduced MBP1 and MBP7 expressions, but increased MBP13 expression. In conclusion, both hypoxia and low pH induced negative effects on mussel defense responses, with hypoxia being the main driver of change. In addition, significant interactive effects between pH and DO were observed on shell-closing strength. Therefore, the adverse effects induced by hypoxia on the defense of mussels may be aggravated by low pH in the natural environments.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Defense Responses to Short-term Hypoxia and Seawater Acidification in the Thick Shell Mussel Mytilus coruscus

et al. 2017

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“…Understanding the biological responses to hypoxic conditions is fundamentally hindered by limited data on the potential interactive effects of hypoxia and acidification on cnidarians (but see, Steckbauer et al., ). The few recent studies that have empirically examined the interactive effects of hypoxia and acidification on marine invertebrates generally demonstrate either additive (bivalves; Jakubowska & Normant, ; Jansson, Norkko, Dupont, & Norkko, ) or synergistic responses (gastropods, bivalves, anemones, respectively; Gobler et al., ; Kim, Barry, & Micheli, ; Steckbauer et al., ) to the dual stressors (but see, bivalves; Sui et al., ). For example, metabolism of two nonsymbiotic, noncalcifying anemones ( Anemonia alicemartinae and Phymactis papillosa ) was depressed under the combined effects of hypoxia and acidification but increased under acidification in isolation (Steckbauer et al., ).…”

Section: Introductionmentioning

confidence: 99%

Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian

Klein

Pitt

Nitschke

et al. 2017

Global Change Biology

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Anthropogenic nutrient inputs enhance microbial respiration within many coastal ecosystems, driving concurrent hypoxia and acidification. During photosynthesis, Symbiodinium spp., the microalgal endosymbionts of cnidarians and other marine phyla, produce O and assimilate CO and thus potentially mitigate the exposure of the host to these stresses. However, such a role for Symbiodinium remains untested for noncalcifying cnidarians. We therefore contrasted the fitness of symbiotic and aposymbiotic polyps of a model host jellyfish (Cassiopea sp.) under reduced O (~2.09 mg/L) and pH (~ 7.63) scenarios in a full-factorial experiment. Host fitness was characterized as asexual reproduction and their ability to regulate internal pH and Symbiodinium performance characterized by maximum photochemical efficiency, chla content and cell density. Acidification alone resulted in 58% more asexual reproduction of symbiotic polyps than aposymbiotic polyps (and enhanced Symbiodinium cell density) suggesting Cassiopea sp. fitness was enhanced by CO -stimulated Symbiodinium photosynthetic activity. Indeed, greater CO drawdown (elevated pH) was observed within host tissues of symbiotic polyps under acidification regardless of O conditions. Hypoxia alone produced 22% fewer polyps than ambient conditions regardless of acidification and symbiont status, suggesting Symbiodinium photosynthetic activity did not mitigate its effects. Combined hypoxia and acidification, however, produced similar numbers of symbiotic polyps compared with aposymbiotic kept under ambient conditions, demonstrating that the presence of Symbiodinium was key for mitigating the combined effects of hypoxia and acidification on asexual reproduction. We hypothesize that this mitigation occurred because of reduced photorespiration under elevated CO conditions where increased net O production ameliorates oxygen debt. We show that Symbiodinium play an important role in facilitating enhanced fitness of Cassiopea sp. polyps, and perhaps also other noncalcifying cnidarian hosts, to the ubiquitous effects of ocean acidification. Importantly we highlight that symbiotic, noncalcifying cnidarians may be particularly advantaged in productive coastal waters that are subject to simultaneous hypoxia and acidification.

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“…Studies on aquatic species' responses to multiple stressors are still relatively limited and are typically short term and laboratory-based. Research to date has encompassed a variety of aquatic species' responses to simultaneous exposure to changes in ocean acidification and temperature (Byrne et al 2009, Matozzo et al 2012, Brisolin De Souza et al 2014, Gräns et al 2014, Graiff et al 2015, Miller et al 2015, Suckling et al 2015, ocean acidification and dissolved oxygen (Gobler et al 2014, DePasquale et al 2015, Sui et al 2016, salinity and temperature (Choi et al 2006), and salinity and dissolved oxygen (Wang et al 2011). Few studies have examined biological responses to more than 2 simultaneous stressors (Catalán et al 2019).…”

Section: Simultaneous Stressorsmentioning

confidence: 99%

Climate change and aquaculture: considering adaptation potential

Reid¹,

Gurney-Smith²,

Flaherty³

et al. 2019

Aquacult. Environ. Interact.

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Increases in global population and seafood demand are occurring simultaneously with fisheries decline in an era of rapid climate change. Aquaculture is well positioned to help meet the world's future seafood needs, but heavy reliance of most global aquaculture on the ambient environment and ecosystem services suggests inherent vulnerability to climate change effects. There are, however, opportunities for adaptation. Engineering and management solutions can reduce exposure to stressors or mitigate stressors through environmental control. Epigenetic adaptation may have the potential to improve stressor tolerance through parental or early life stage exposure. Stressor-resistant traits can be genetically selected for, and maintaining adequate population variability can improve resilience and overall fitness. Information at appropriate time scales is crucial for adaptive response, such as real-time data on stressor levels and/or species' responses, early warning of deleterious events, or prediction of longer-term change. Diet quality and quantity have the potential to meet increasing energetic and nutritional demands associated with mitigating the effects of abiotic and biotic climate change stressors. Research advancements in understanding how climate change affects aquaculture will benefit most from a combination of empirical studies, modelling approaches, and observations at the farm level. Research to support aquaculture adaptation requires an increasing amount of environmental data to guide biological response studies for regional applications. Increased experimental complexity, resources, and duration will be necessary to better understand the effects of multiple stressors. Ultimately, in order for aquaculture sectors to move beyond short-term coping responses, governance initiatives incorporating the changing needs of stakeholders, users, and culture ecosystems as a whole are required to facilitate planned climate change adaptation and mitigation.

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Effects of short-term hypoxia and seawater acidification on hemocyte responses of the mussel Mytilus coruscus

Cited by 57 publications

References 56 publications

Defense Responses to Short-term Hypoxia and Seawater Acidification in the Thick Shell Mussel Mytilus coruscus

Defense Responses to Short-term Hypoxia and Seawater Acidification in the Thick Shell Mussel Mytilus coruscus

Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian

Climate change and aquaculture: considering adaptation potential

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