Climate change rapidly warms and acidifies Australian estuaries

Scanes, Elliot; Scanes, Peter; Ross, Philip E.

doi:10.1038/s41467-020-15550-z

Cited by 187 publications

(120 citation statements)

References 61 publications

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“…This was an initial +6˚C (from 20˚C to 26˚C) and a further increase of +2˚C (from 26˚C to 28˚C). The 28˚C maximum represents a 3.5˚C increase on mean (last 12 years) summer water temperatures in Port Stephens, and 1˚C increase on the maximum summer daily water temperatures on record [42]. There was no mortality following heat shock treatment.…”

Section: Heat Shockmentioning

confidence: 93%

Can prior exposure to stress enhance resilience to ocean warming in two oyster species?

et al. 2020

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Securing economically and ecologically significant molluscs, as our oceans warm due to climate change, is a global priority. South eastern Australia receives warm water in a strengthening East Australia Current and so resident species are vulnerable to elevated temperature and marine heat waves. This study tested whether prior exposure to elevated temperature can enhance resilience of oysters to ocean warming. Two Australian species, the flat oyster, Ostrea angasi, and the Sydney rock oyster, Saccostrea glomerata, were obtained as adults and "heat shocked" by exposure to a dose of warm water in the laboratory. Oysters were then transferred to elevated seawater temperature conditions where the thermal outfall from power generation was used as a proxy to investigate the impacts of ocean warming. Shell growth, condition index, lipid content and survival of flat oysters and condition of Sydney rock oysters were all significantly reduced by elevated seawater temperature in the field. Flat oysters grew faster than Sydney rock oysters at ambient temperature, but their growth and survival was more sensitive to elevated temperature. "Stress inoculation" by heat shock did little to ameliorate the negative effects of increased temperature, although the survival of heat-shocked flat oysters was greater than non-heat shocked oysters. Further investigations are required to determine if early exposure to heat stress can enhance resilience of oysters to ocean warming. OPEN ACCESSCitation: Pereira RRC, Scanes E, Gibbs M, Byrne M, Ross PM (2020) Can prior exposure to stress enhance resilience to ocean warming in two oyster species? PLoS ONE 15(4): e0228527. https://doi.

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Section: Heat Shockmentioning

confidence: 93%

Can prior exposure to stress enhance resilience to ocean warming in two oyster species?

et al. 2020

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“…As a consequence of this variability, the role of marine macrophytes in ameliorating exposure to low pH, in terms of timing, magnitude, extent, and relevance for organisms remains uncertain. For example, of the available studies in seagrass ecosystems, some suggest net amelioration of low pH (Buapet et al, 2013; Cyronak et al, 2018; Hendriks et al, 2014; Scanes et al, 2020; Su et al, 2020; Unsworth et al, 2012), while others suggest seagrasses may also amplify negative effects (Pacella et al, 2018). The limited spatial and temporal scales of prior studies further hinders understanding (Buapet et al, 2013; Cyronak et al, 2018; Hendriks et al, 2014; Pacella et al, 2018; Saderne et al, 2013, 2019; Semesi et al, 2009; Unsworth et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Coast‐wide evidence of low pH amelioration by seagrass ecosystems

Ricart

Ward

Hill

et al. 2021

Global Change Biology

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Global‐scale ocean acidification has spurred interest in the capacity of seagrass ecosystems to increase seawater pH within crucial shoreline habitats through photosynthetic activity. However, the dynamic variability of the coastal carbonate system has impeded generalization into whether seagrass aerobic metabolism ameliorates low pH on physiologically and ecologically relevant timescales. Here we present results of the most extensive study to date of pH modulation by seagrasses, spanning seven meadows (Zostera marina) and 1000 km of U.S. west coast over 6 years. Amelioration by seagrass ecosystems compared to non‐vegetated areas occurred 65% of the time (mean increase 0.07 ± 0.008 SE). Events of continuous elevation in pH within seagrass ecosystems, indicating amelioration of low pH, were longer and of greater magnitude than opposing cases of reduced pH or exacerbation. Sustained elevations in pH of >0.1, comparable to a 30% decrease in [H+], were not restricted only to daylight hours but instead persisted for up to 21 days. Maximal pH elevations occurred in spring and summer during the seagrass growth season, with a tendency for stronger effects in higher latitude meadows. These results indicate that seagrass meadows can locally alleviate low pH conditions for extended periods of time with important implications for the conservation and management of coastal ecosystems.

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“…In aquatic environments, coastal areas may be more vulnerable than deeper waters. Transitional coastal areas are also of a heterogeneous nature, meaning that climatic impacts in these areas are context-specific and may be difficult to pinpoint [8] and to generalize depending upon local ecosystem characteristics such as depth and flushing times [9]. According to [9], lagoons were found to be the fastestwarming ecosystem types, falling within the "warm spot" of shallow average depths and short-medium flushing times.…”

Section: Introductionmentioning

confidence: 99%

Multiple Evidence for Climate Patterns Influencing Ecosystem Productivity across Spatial Gradients in the Venice Lagoon

Bertolini

Royer

Pastres

2021

JMSE

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Effects of climatic changes in transitional ecosystems are often not linear, with some areas likely experiencing faster or more intense responses, which something important to consider in the perspective of climate forecasting. In this study of the Venice lagoon, time series of the past decade were used, and primary productivity was estimated from hourly oxygen data using a published model. Temporal and spatial patterns of water temperature, salinity and productivity time series were identified by applying clustering analysis. Phytoplankton and nutrient data from long-term surveys were correlated to primary productivity model outputs. pmax, the maximum oxygen production rate in a given day, was found to positively correlate with plankton variables measured in surveys. Clustering analysis showed the occurrence of summer heatwaves in 2008, 2013, 2015 and 2018 and three warm prolonged summers (2012, 2017, 2019) coincided with lower summer pmax values. Spatial effects in terms of temperature were found with segregation between confined and open areas, although the patterns varied from year to year. Production and respiration differences showed that the lagoon, despite seasonality, was overall heterotrophic, with internal water bodies having greater values of heterotrophy. Warm, dry years with high salinity had lower degrees of summer autotrophy.

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Climate change rapidly warms and acidifies Australian estuaries

Cited by 187 publications

References 61 publications

Can prior exposure to stress enhance resilience to ocean warming in two oyster species?

Can prior exposure to stress enhance resilience to ocean warming in two oyster species?

Coast‐wide evidence of low pH amelioration by seagrass ecosystems

Multiple Evidence for Climate Patterns Influencing Ecosystem Productivity across Spatial Gradients in the Venice Lagoon

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