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SUMMARY:Ocean acidification alters the nutritional value of Antarctic diat
 oms
DTSTART;VALUE=DATE-TIME:20211125T070300Z
DTEND;VALUE=DATE-TIME:20211125T070400Z
DTSTAMP;VALUE=DATE-TIME:20260718T054033Z
UID:indico-contribution-4221@events01.synchrotron.org.au
DESCRIPTION:Speakers: Rebecca Duncan (University of Technology Sydney and 
 UNIS Svalbard)\nThe cold waters of the Southern Ocean (SO) are acknowledge
 d as a major hotspot for atmospheric CO2 uptake and is anticipated to be o
 ne of first regions to be affected by Ocean acidification (OA). Primary pr
 oduction in the SO is dominated by diatom-rich phytoplankton assemblages\,
  whose individual physiologies and community composition are strongly shap
 ed by the environment\, yet knowledge on how diatoms allocate cellular ene
 rgy in response to OA is limited. Using Synchrotron based FTIR-Microspectr
 oscopy at the Australian Synchrotron\, we analysed the macromolecular cont
 ent of selected individual diatom taxa from a natural Antarctic phytoplank
 ton community exposed to a gradient of fCO2 levels (288 – 1263 µatm). W
 e found strong species-specific differences in macromolecular partitioning
  under OA. Larger taxa showed preferential energy allocation towards prote
 ins\, while smaller taxa increased both lipid and protein stores. Our stud
 y also revealed an OA-induced community shift towards smaller taxa and low
 er silicification rates at high fCO2. If these changes are representative 
 of future Antarctic diatom physiology\, we may expect a shift away from li
 pid rich large diatoms towards a community dominated by smaller\, less sil
 icified taxa\, but with higher lipid and protein stores than their present
 -day contemporaries\, a response that could have cascading effects on food
 web dynamics in the Antarctic marine ecosystem.\n\nhttps://events01.synchr
 otron.org.au/event/146/contributions/4221/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4221/
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