Evaluating the effects of ocean warming and freshening on the physiological energetics and transcriptomic response of the Antarctic limpet Nacella concinna

Navarro, Jorge M.; Détrée, Camille; Morley, Simon A.; Cárdenas, Leyla; Ortíz, Alejandro; Vargas‐Chacoff, Luis; Paschke, Kurt; Gallardo, Pablo; Guillemin, Marie‐Laure; González‐Wevar, Claudio A.

doi:10.1016/j.scitotenv.2020.142448

Cited by 15 publications

(5 citation statements)

References 71 publications

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“…It may suggest that these southern scallop species exhibit favorable growth performance when the water temperature ranges between 9 and 11°C, with growth slowing notably beyond 13°C. This physiological response is similar to what has been observed in Z. patagonica, where a 60% mortality rate was recorded when cultivated at 12°C and an 80% rate at 15°C [19]. This underscores the impact of seawater temperature changes as a decisive factor that can lead to a significant increase in metabolic expenditure [26].…”

Section: Discussionsupporting

confidence: 86%

“…However, in the case of natural Z. patagonica banks in the South Atlantic, differences in growth rates are believed to be constrained by hydrographic processes that influence primary productivity [18]. Conversely, the combined impact of rising ocean temperatures and carbon dioxide levels in seawater has significant physiological and ecological consequences for numerous Antarctic and sub-Antarctic marine invertebrates [19]. Additionally, rising temperatures have been observed to directly affect the survival of Z. patagonica [20].…”

Section: Discussionmentioning

confidence: 99%

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Growth and Survival of Scallops Austrochlamys natans (Philippi, 1845) and Zygochlamys patagonica (P. P. King, 1832) in Suspended Systems and Land-Based Tanks in Chilean Patagonia

Gallardo,

Araneda,

de Godoy

et al. 2024

Aquaculture Research

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The southern scallop (Austrochlamys natans) and the Patagonian scallop (Zygochlamys patagonica) are vital species in the fisheries of Chilean Patagonia. However, overfishing has led to stock depletion, necessitating research for stock restoration and commercial production. This study aimed to evaluate the growth and survival of these scallops in suspended systems and land-based tanks across various Patagonian regions. Eight experiments were conducted, three with southern scallops and five with Patagonian scallops. For southern scallops, two experiments involved suspended systems at different shell heights and three tested land-based tanks at various temperatures (9, 11, and 13°C). Patagonian scallop experiments included one suspended system in an endemic area, land-based tanks with different temperatures (9, 11, and 13°C), and three suspended systems outside the species’ endemic zone. In suspended systems, southern scallops grew from 15.1 to 42.7 mm (shell height) in 322 days, with a rate of 0.085 mm/day and a survival rate of 43.7%. Patagonian scallops reached 46.0 mm shell height in 466 days, with a growth rate of 0.079 mm/day and a survival rate of 57.2%. Experiments in controlled-temperature tanks revealed that 13°C was the lethal temperature for southern scallops. Notably, higher growth rates occurred at temperatures between 9 and 11°C. Both species show potential for future commercial cultivation, contributing to Chilean aquaculture diversification.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Growth and Survival of Scallops Austrochlamys natans (Philippi, 1845) and Zygochlamys patagonica (P. P. King, 1832) in Suspended Systems and Land-Based Tanks in Chilean Patagonia

Gallardo,

Araneda,

de Godoy

et al. 2024

Aquaculture Research

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“…Little is currently known on potential non‐native species‐specific physiological tolerances to environmental changes (or ability to reproduce), either during transit to, or within the environmental extremes found within SGSSI and the sub‐Antarctic (e.g. Convey & Peck, 2019; Davenport & Macalister, 1996; Holland et al., 2021; Navarro et al., 2024; Peck et al., 2004, 2014). These data will be a key next step in order to identify riskiest ports of origin, based on species known or predicted to come from certain locations.…”

Section: Discussionmentioning

confidence: 99%

Identifying marine invasion threats and management priorities through introduction pathway analysis in a remote sub‐Antarctic ecosystem

Bayley,

Brewin,

James

et al. 2024

Ecology and Evolution

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The threat from novel marine species introductions is a global issue. When non‐native marine species are introduced to novel environments and become invasive, they can affect biodiversity, industry, ecosystem function, and both human and wildlife health. Isolated areas with sensitive or highly specialised endemic species can be particularly impacted. The global increase in the scope of tourism and other human activities, together with a rapidly changing climate, now put these remote ecosystems under threat. In this context, we analyse invasion pathways into South Georgia and the South Sandwich Islands (SGSSI) for marine non‐native species via vessel biofouling. The SGSSI archipelago has high biodiversity and endemism, and has historically been highly isolated from the South American mainland. The islands sit just below the Polar Front temperature boundary, affording some protection against introductions. However, the region is now warming and SGSSI increasingly acts as a gateway port for vessel traffic into the wider Antarctic, amplifying invasion likelihood. We use remote Automatic Identification System vessel‐tracking data over a 2‐year period to map vessel movement and behaviour around South Georgia, and across the ‘Scotia Sea’, ‘Magellanic’ and northern ‘Continental High Antarctic’ ecoregions. We find multiple vessel types from locations across the globe frequently now enter shallow inshore waters and stop for prolonged periods (weeks/months) at anchor. Vessels are active throughout the year and stop at multiple port hubs, frequently crossing international waters and ecoregions. Management recommendations to reduce marine invasion likelihood within SGSSI include initiating benthic and hull monitoring at the identified activity/dispersion hubs of King Edward Point, Bay of Isles, Gold Harbour, St Andrews Bay and Stromness Bay. More broadly, regional collaboration and coordination is necessary at neighbouring international ports. Here vessels need increased pre‐ and post‐arrival biosecurity assessment following set protocols, and improved monitoring of hulls for biofouling to pre‐emptively mitigate this threat.

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“…It shows that the bivalves were able to enhance immune competence under mild warming and thus respond to one of the major ecological complications in a climate change scenario ( Mackenzie et al, 2014 ). Notably, both congeneric lineages failed to exhibit other typical responses to thermal stress such as the activation of heat shock proteins (HSP) which is commonly observed in many species, including bivalves, under exposure to a wide range of environmental stressors ( Kim et al, 2017 ; Navarro et al, 2020 ). The absence of a heat shock response (HSR) in our GO analysis is, however, not completely unexpected.…”

Section: Discussionmentioning

confidence: 99%

A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves

Martínez

González-Aravena²,

Held³

et al. 2023

Front. Physiol.

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When an organism makes a long-distance transition to a new habitat, the associated environmental change is often marked and requires physiological plasticity of larvae, juveniles, or other migrant stages. Exposing shallow-water marine bivalves (Aequiyoldia cf. eightsii) from southern South America (SSA) and the West Antarctic Peninsula (WAP) to changes in temperature and oxygen availability, we investigated changes in gene expression in a simulated colonization experiment of the shores of a new continent after crossing of the Drake Passage, and in a warming scenario in the WAP. Bivalves from SSA were cooled from 7°C (in situ) to 4°C and 2°C (future warmed WAP conditions), WAP bivalves were warmed from 1.5°C (current summer in situ) to 4°C (warmed WAP), gene expression patterns in response to thermal stress by itself and in combination with hypoxia were measured after 10 days. Our results confirm that molecular plasticity may play a vital role for local adaptation. Hypoxia had a greater effect on the transcriptome than temperature alone. The effect was further amplified when hypoxia and temperature acted as combined stressors. The WAP bivalves showed a remarkable ability to cope with short-term exposure to hypoxia by switching to a metabolic rate depression strategy and activating the alternative oxidation pathway, whilst the SSA population showed no comparable response. In SSA, the high prevalence of apoptosis-related differentially expressed genes especially under combined higher temperatures and hypoxia indicated that the SSA Aequiyoldia are operating near their physiological limits already. While the effect of temperature per se may not represent the single most effective barrier to Antarctic colonization by South American bivalves, the current distribution patterns as well as their resilience to future conditions can be better understood by looking at the synergistic effects of temperature in conjunction with short-term exposure to hypoxia.

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Evaluating the effects of ocean warming and freshening on the physiological energetics and transcriptomic response of the Antarctic limpet Nacella concinna

Cited by 15 publications

References 71 publications

Growth and Survival of Scallops Austrochlamys natans (Philippi, 1845) and Zygochlamys patagonica (P. P. King, 1832) in Suspended Systems and Land-Based Tanks in Chilean Patagonia

Growth and Survival of Scallops Austrochlamys natans (Philippi, 1845) and Zygochlamys patagonica (P. P. King, 1832) in Suspended Systems and Land-Based Tanks in Chilean Patagonia

Identifying marine invasion threats and management priorities through introduction pathway analysis in a remote sub‐Antarctic ecosystem

A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves

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