Data from: Everything is not everywhere: marine compartments shape phytoplankton assemblages
The idea that “everything is everywhere, but the environment selects” has been seminal in microbial biogeography, and marine phytoplankton is one of the prototypical groups used to illustrate this. The typical argument has been that phytoplankton is ubiquitous, but that distinct assemblages form und...
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Zusammenfassung: | The idea that “everything is everywhere, but the environment selects” has
been seminal in microbial biogeography, and marine phytoplankton is one of
the prototypical groups used to illustrate this. The typical argument has
been that phytoplankton is ubiquitous, but that distinct assemblages form
under environmental selection. It is well established that phytoplankton
assemblages vary considerably between coastal ecosystems. However, the
relative roles of compartmentalisation of regional seas and site-specific
environmental conditions in shaping assemblage structures, have not been
specifically examined. We collected data from coastal embayments that fall
within two different water compartments within the same regional sea and
are characterised by highly localised environmental pressures. We used
PCNM and AEM models to partition the effects that spatial structures,
environmental conditions and their overlap had on the variation in
assemblage composition. Our models explained a high percentage of
variation in assemblage composition (59-65%) and showed that spatial
structure consistent with marine compartmentalisation played a more
important role than local environmental conditions. At least during the
study period, surface currents connecting sites within the two
compartments failed to generate sufficient dispersal to offset the impact
of differences due to compartmentalisation. In other words, our findings
suggest that, even for a prototypical cosmopolitan group, everything is
not everywhere. |
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DOI: | 10.5061/dryad.qfttdz0c8 |