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Hannes Baumann


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The ‘Evolutionary Fish Ecology’ Lab at the Department of Marine Sciences uses experimental, field, and modeling approaches to address the central question, how coastal marine organisms will cope with the simultaneous changes in their environment caused by global and regional human stressors, and how they are already adapted to environmental variability in e.g. temperature, oxygen, or pH.

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Environmental changes include coastal pH, pCO2, oxygen, and temperature, which are all projected to change with progressing global climate change and urbanization. Marine environments are also affected by size-selective fishing, which may alter the genotypic composition of commercial fish species. We utilize a widening suite of experimental, field, and modeling approaches, welcome undergraduate participation, and coordinate our efforts with local authorities working on issues of Long Island Sound.
Baumann-etal-BiolLett2018---Fig01Biology Letters published our latest study, a meta-analysis of 20 standard CO2 exposure experiments conducted on Atlantic silverside offspring between 2012-2017. Years of sustained experimental work resulted in the most robustly constrained estimates of overall CO2 effect sizes for a marine organism to date. The study showed:
  • A general tolerance of Atlantic silverside early life stages to pCO2 levels of ~2,000 µatm
  • A significant overall CO2 induced reduction of embryo and overall survival by -9% and -13%, respectively
  • The seasonal change in early life CO2 sensitivity in this species
  • The value of serial experimentation to detect and robustly estimate CO2 effects in marine organisms
  • Citation:
    Baumann, H., Cross, E.L., and Murray, C.S. (2018)
    Robust quantification of fish early life CO2 sensitivities via serial experimentation
    Biology Letters 14:20180408


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