Month: April 2019

[Lab news] Whole life cycle CO2 fish are getting sampled

18 April 2019. This Thursday was a long day in the Baumann lab, because we sampled and processed over 200 adult silversides from a unique experiment. These fish were fertilized in the lab and reared from eggs to adulthood under different temperatures and contrasting CO2 conditions. We are interested to see, if future ocean conditions have measurable effects on this species fecundity, growth, and oocyte characteristics. We also took tissue and genetic samples, with an effective line-up of hands, i.e., Hannes, Emma, Chris, Callie and Lucas.
Good teamwork all!


[Publication] Brachiopods thicken shells to compensate for shell dissolution under future OA conditions

15 April 2019. Today, Emma is happy to report that Environmental Science & Technology have just published the latest paper from her PhD about brachiopod resilience to future ocean acidification. This project involved long-term culturing of a polar and a temperate brachiopod under future ocean acidification and warming conditions. Substantial shell dissolution posed a threat to both species under ocean acidification, with more extensive dissolution occurring in the polar species.

Unexpectedly, we discovered that brachiopods thicken their shell from the inner shell surface when extensive dissolution occurs at the outer shell surface under ocean acidification. This is an important finding to further our understanding of how predicted vulnerable marine calcifiers might cope under future environmental change.


Cross, E. L., Harper, E. M. and Peck, L. S. 2019. Thicker shells compensate extensive dissolution in brachiopods under future ocean acidification. Environmental Science & Technology (published online March 29, 2019).

[Publication] Perspective on experimental OA research published!

15 April 2019. Today, the Canadian Journal of Zoology published a perspective on the progress and challenges of experimental ocean acidification research, written by Hannes last year as an extension of keynote lectures on this topic given at the Annual meeting of the Canadian Zoological Society (St. John’s, NL, Canada) and the Gordon Research Symposium (Waterville Valley, NH). The perspective takes stock of the progress achieved in the field over past two decades in four key areas, hoping to inspire particularly new researchers to the field to build on this foundation.

Abstract: Experimental studies assessing the potential impacts of ocean acidification on marine organisms have rapidly expanded and produced a wealth of empirical data over the past decade. This perspective examines four key areas of transfor- mative developments in experimental approaches: (1) methodological advances; (2) advances in elucidating physiological and molecular mechanisms behind observed CO2 effects; (3) recognition of short-term CO2 variability as a likely modifier of species sensitivities (Ocean Variability Hypothesis); and (4) consensus on the multistressor nature of marine climate change where effect interactions are still challenging to anticipate. No single experiment allows predicting the fate of future populations. But sustaining the accumulation of empirical evidence is critical for more robust estimates of species reaction norms and thus for enabling better modeling approaches. Moreover, advanced experimental approaches are needed to address knowledge gaps including changes in species interactions and intraspecific variability in sensitivity and its importance for the adaptation potential of marine organisms to a high CO2 world.
Illustration of the Ocean Variability Hypothesis positing that the CO2 sensitivity of marine organisms is related to the magnitude of short-term CO2 fluctuations in their habitat (e.g., from nearshore to open ocean) and length of their early life stage durations. It suggests that the most CO2 tolerant marine organisms are those that develop fast and (or) in habitats with large contemporary CO2 fluctuations, whereas the potentially most vulnerable species are those that develop slowly in relatively stable open-ocean habitats.

[Media] WSHU public radio covers Project Oceanology story

4 April 2019. Following the publication of our study on the Project Oceanology time-series in Marine Environmental Research and the subsequent article about it in TheConversation, today the story was featured by WSHU public radio, in Ron Ropiak’s show “The Full Story“.

Have a listen, how Hannes describes both the findings and the significance of the Project Oceanology time series.