Hernaman Vanessa

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Hernaman
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Vanessa
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  • Article
    Editorial: Advances in marine heatwave interactions
    (Frontiers Media, 2023-03-30) Sen Gupta, Alex ; Ryan, Svenja ; Hernaman, Vanessa
    With growing appreciation of the predominant role of climate extremes as the most impactful manifestation of anthropogenic warming, marine heatwave (MHW) research has exploded. Changes to the physical environment driven by MHWs can have devastating effects on ecosystems and reliant industries, with losses of tens of millions of US$ associated with many individual MHW events (Smith et al., 2021). This special edition explores new directions in MHW research around forecasting events across different timescales, understanding drivers, delving below the surface, examining the interaction between different types of extremes, and understanding the ecosystem and fisheries implications and how to manage these disruptive events.
  • Article
    Effect of ocean acidification on otolith development in larvae of a tropical marine fish
    (Copernicus Publications on behalf of the European Geosciences Union, 2011-06-22) Munday, Philip L. ; Hernaman, Vanessa ; Dixson, D. L. ; Thorrold, Simon R.
    Calcification in many invertebrate species is predicted to decline due to ocean acidification. The potential effects of elevated CO2 and reduced carbonate saturation state on other species, such as fish, are less well understood. Fish otoliths (earbones) are composed of aragonite, and thus, might be susceptible to either the reduced availability of carbonate ions in seawater at low pH, or to changes in extracellular concentrations of bicarbonate and carbonate ions caused by acid-base regulation in fish exposed to high pCO2. We reared larvae of the clownfish Amphiprion percula from hatching to settlement at three pHNBS and pCO2 levels (control: ~pH 8.15 and 404 μatm CO2; intermediate: pH 7.8 and 1050 μatm CO2; extreme: pH 7.6 and 1721 μatm CO2) to test the possible effects of ocean acidification on otolith development. There was no effect of the intermediate treatment (pH 7.8 and 1050 μatm CO2) on otolith size, shape, symmetry between left and right otoliths, or otolith elemental chemistry, compared with controls. However, in the more extreme treatment (pH 7.6 and 1721 μatm CO2) otolith area and maximum length were larger than controls, although no other traits were significantly affected. Our results support the hypothesis that pH regulation in the otolith endolymph can lead to increased precipitation of CaCO3 in otoliths of larval fish exposed to elevated CO2, as proposed by an earlier study, however, our results also show that sensitivity varies considerably among species. Importantly, our results suggest that otolith development in clownfishes is robust to even the more pessimistic changes in ocean chemistry predicted to occur by 2100.