SIO Faculty Candidate Seminar - Christian Moellmann

06/04/2015 - 12:30pm


DATE:          June 4th, Thursday, 12:30 p.m.

LOCATION:   Hubbs Hall 4500

*Additionally, a “chalk talk” presentation will be held in Vaughan Hall 100 on June 5th at 3pm

SPEAKER:      Christian Moellmann, Ph.D.
                          University of Hamburg

TITLE:  Non-stationarity and Novelty in Exploited Marine Ecosystems

Marine ecosystems are under increasing external pressure through direct human agency and climate change. Consequences of the increasing external impact is a higher vulnerability of exploited systems to abrupt and unanticipated changes such as ecosystem regime shifts. For marine ecosystems the regime shift concept is contentious with discussions arising around (i) the relative importance of external drivers such as climate change and fisheries exploitation, (ii) the mechanisms leading to the observed sudden changes, and (iii) whether such changes result in transient or long-lasting alternative stable states. Using the ecosystems of the Baltic and North Sea as case studies here I explore if multiple external drivers can lead to non-stationarity in trophic controls, i.e. changes between bottom-up and top-down food web regulation, and if these changes coincide with observed major regime shifts in both ecosystems. I will further use the Baltic Sea case study to show that the interplay between climate changes and overexploitation can lead to alternative ecosystem configurations diminishing the recovery potential of once depleted species, in this case Baltic cod (Gadus morhua). Eventually I discuss the importance of the concepts of social-ecological coupling and novel ecosystems for extending the theory on regime shifts to be more useful for marine ecosystem-based management.

Faculty Host:  Mark Ohman  (
For more information on this event, contact: 
Leslie Costi
Event Calendar: 
Hubbs Hall 4500