A high-resolution modeling study on diel and seasonal vertical migrations of high-latitude copepods

dc.contributor.author Bandara, Kanchana
dc.contributor.author Varpe, Øystein
dc.contributor.author Ji, Rubao
dc.contributor.author Eiane, Ketil
dc.date.accessioned 2018-03-02T15:52:56Z
dc.date.available 2018-03-02T15:52:56Z
dc.date.issued 2017-12-26
dc.description © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Ecological Modelling 368 (2018): 357-376, doi:10.1016/j.ecolmodel.2017.12.010. en_US
dc.description.abstract Despite diel and seasonal vertical migrations (DVM and SVM) of high-latitude zooplankton have been studied since the late-19th century, questions still remain about the influence of environmental seasonality on vertical migration, and the combined influence of DVM and SVM on zooplankton fitness. Toward addressing these, we developed a model for simulating DVM and SVM of high-latitude herbivorous copepods in high spatio-temporal resolution. In the model, a unique timing and amplitude of DVM and SVM and its ontogenetic trajectory were defined as a vertical strategy. Growth, survival and reproductive performances of numerous vertical strategies hardwired to copepods spawned in different times of the year were assessed by a fitness estimate, which was heuristically maximized by a Genetic Algorithm to derive the optimal vertical strategy for a given model environment. The modelled food concentration, temperature and visual predation risk had a significant influence on the observed vertical strategies. Under low visual predation risk, DVM was less pronounced, and SVM and reproduction occurred earlier in the season, where capital breeding played a significant role. Reproduction was delayed by higher visual predation risk, and copepods that spawned later in the season used the higher food concentrations and temperatures to attain higher growth, which was efficiently traded off for survival through DVM. Consequently, the timing of SVM did not change much from that predicted under lower visual predation risk, but the body and reserve sizes of overwintering stages and the importance of capital breeding diminished. Altogether, these findings emphasize the significance of DVM in environments with elevated visual predation risk and shows its contrasting influence on the phenology of reproduction and SVM, and moreover highlights the importance of conducting field and modeling work to study these migratory strategies in concert. en_US
dc.description.sponsorship This project was funded by VISTA (project no. 6165), a basic research program in collaboration between The Norwegian Academy of Science and Letters and Statoil. ØV received funding from the Fulbright Arctic Initiative. en_US
dc.identifier.citation Ecological Modelling 368 (2018): 357-376 en_US
dc.identifier.doi 10.1016/j.ecolmodel.2017.12.010
dc.identifier.uri https://hdl.handle.net/1912/9614
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.relation.uri https://doi.org/10.1016/j.ecolmodel.2017.12.010
dc.rights Attribution 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by/4.0/ *
dc.subject Vertical migration en_US
dc.subject Seasonality en_US
dc.subject Phenology en_US
dc.subject Optimization model en_US
dc.subject Genetic algorithm en_US
dc.subject Habitat choice en_US
dc.title A high-resolution modeling study on diel and seasonal vertical migrations of high-latitude copepods en_US
dc.type Article en_US
dspace.entity.type Publication
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