Local intraspecific aggregation in phytoplankton model communities: spatial scales of occurrence and implications for coexistence
| hal.structure.identifier | Institut de Mathématiques de Bordeaux [IMB] | |
| dc.contributor.author | PICOCHE, Coralie | |
| hal.structure.identifier | Scripps Institution of Oceanography [SIO - UC San Diego] | |
| dc.contributor.author | YOUNG, William R. | |
| hal.structure.identifier | Institut de Mathématiques de Bordeaux [IMB] | |
| dc.contributor.author | BARRAQUAND, Frédéric | |
| dc.date.accessioned | 2024-04-04T02:39:34Z | |
| dc.date.available | 2024-04-04T02:39:34Z | |
| dc.date.created | 2022-10-20 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/190979 | |
| dc.description.abstractEn | The coexistence of multiple phytoplankton species despite their reliance on similar resources is often explained with mean-field models assuming mixed populations. In reality, observations of phytoplankton indicate spatial aggregation at all scales, including at the scale of a few individuals. Local spatial aggregation can hinder competitive exclusion since individuals then interact mostly with other individuals of their own species, rather than competitors from different species. To evaluate how microscale spatial aggregation might explain phytoplankton diversity maintenance, an individual-based, multispecies representation of cells in a hydrodynamic environment is required. We formulate a three-dimensional and multispecies individual-based model of phytoplankton population dynamics at the Kolmogorov scale. The model is studied through both simulations and the derivation of spatial moment equations, in connection with point process theory. The spatial moment equations show a good match between theory and simulations. We parameterized the model based on phytoplankters' ecological and physical characteristics, for both large and small phytoplankton. Defining a zone of potential interactions as the overlap between nutrient depletion volumes, we show that local species composition-within the range of possible interactions-depends on the size class of phytoplankton. In large phytoplankton, individuals are surrounded by cells from other species, while in small phytoplankton, individuals remain in mostly monospecific clusters. Spatial structure therefore favours intra- over inter-specific interactions for small phytoplankton, which likely contributes to coexistence mechanisms. Other factors behind diversity maintenance must be examined for large phytoplankton. | |
| dc.language.iso | en | |
| dc.title.en | Local intraspecific aggregation in phytoplankton model communities: spatial scales of occurrence and implications for coexistence | |
| dc.type | Document de travail - Pré-publication | |
| dc.subject.hal | Sciences du Vivant [q-bio]/Biodiversité/Evolution [q-bio.PE] | |
| dc.identifier.arxiv | 2210.11364 | |
| bordeaux.hal.laboratories | Institut de Mathématiques de Bordeaux (IMB) - UMR 5251 | * |
| bordeaux.institution | Université de Bordeaux | |
| bordeaux.institution | Bordeaux INP | |
| bordeaux.institution | CNRS | |
| hal.identifier | hal-03845294 | |
| hal.version | 1 | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03845294v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=PICOCHE,%20Coralie&YOUNG,%20William%20R.&BARRAQUAND,%20Fr%C3%A9d%C3%A9ric&rft.genre=preprint |
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