Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.ecolmodel.2021.109427
Document accepted manuscript
Title (Primary) The impact of seasonal regulation of metabolism on the life history of Antarctic krill
Author Bahlburg, D.; Meyer, B.; Berger, U.
Journal Ecological Modelling
Year 2021
Department OESA
Volume 442
Page From art. 109427
Language englisch
Topic T5 Future Landscapes
Keywords DEB theory; Euphausia superba; Metabolic regulation; Temperature; Photoperiod
Abstract Antarctic krill up- and down-regulate their metabolism as a strategy to cope with the strong seasonal environmental fluctuations in the Southern Ocean. In this study, we investigate the impact of this light- and temperature dependent metabolic regulation on growth, reproduction and winter survival of krill. Therefore, we advance a bioenergetic growth model of krill by adding a data-derived scaling function of krill activity. With SERBIK (SEasonally Regulated BIoenergetic Krill growth model), we conduct a numerical experiment which tests the impact of such scaling on krill life history under two different winter food conditions: In the first scenario, we simulate life history of krill when winter food availability is low; in the second scenario, winter food availability is increased within realistic ranges. The results demonstrate that the scaling of metabolism is especially important during low food winters. Reducing metabolism during winter permits individuals to grow to larger body length, reproduce successfully and release a greater number of eggs. It further significantly reduces within-year size fluctuations caused by starvation during months with low food availability. Finally, SERBIK can be used in future spatial modelling studies which include movement of krill along latitudinal gradients and thus spatio-temporal gradients in light- and temperature.
Persistent UFZ Identifier
Bahlburg, D., Meyer, B., Berger, U. (2021):
The impact of seasonal regulation of metabolism on the life history of Antarctic krill
Ecol. Model. 442 , art. 109427