@article{fdi:010081034,
  title = {{I}ntrinsic timescales of variability in a marine plankton model},
  author = {{M}ayersohn, {B}. and {S}mith, {K}. {S}. and {M}angolte, {I}. and {L}evy, {M}arina},
  editor = {},
  language = {{ENG}},
  abstract = {{P}hytoplankton are known to exhibit temporal variability in biomass and community composition. {W}hile physically driven sources of variability have been studied extensively, ecosystems often exhibit complicated intrinsic dynamics that are not as well understood. {A}s a first step towards assessing the contribution of this intrinsic variability to the total variability in the ocean, we examine the temporal scales of intrinsic variability in a marine plankton model suitable for use in climate model projections. {O}ur rationale is that a better understanding of the time scales over which intrinsic variability manifests could help in the attribution of observed variability. {O}ur model includes multiple phytoplankton, dissolved inorganic nutrients, and zooplankton and supports two oscillatory mechanisms: "{R}-oscillations", corresponding to patterns of species succession and associated with changes in resources, and "{Z}-oscillations", corresponding to changes in total phytoplankton biomass due to predator-prey interactions. {O}ver a wide range of model parameters, we found that while {Z}-oscillations typically occurred on time scales not exceeding 60 days, {R}-oscillations ranged from roughly 100 to 900 days under predation-free conditions, and {R}-oscillations occurred on longer time scales when interacting with {Z}-oscillations. {T}hus the two kinds of oscillations can be easily distinguished. {A}t high grazing rates, we identified aperiodic cases where the dominant period never resolved, with distinct regimes emerging over decadal (or longer) time scales. {T}hese chaotic regime shifts are likely highly dependent on the model parameters and structure. {M}ore work must be done to understand how these oscillations interact with physical forcings.},
  keywords = {{I}ntrinsic variability ; {P}hytoplankton ; {P}redator-prey dynamics},
  booktitle = {},
  journal = {{E}cological {M}odelling},
  volume = {443},
  numero = {},
  pages = {109446 [12 p.]},
  ISSN = {0304-3800},
  year = {2021},
  DOI = {10.1016/j.ecolmodel.2021.109446},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081034},
}