Surface vs. mesopelagic | Surface vs. bathypelagic | |||

Size fraction | R | P value | R | P value |

0.2–0.8 µm | −0.18 | 0.752 | −0.18 | 0.829 |

0.8–3.0 µm | −0.14 | 0.675 | 0.29 | 0.11 |

3.0–5.0 µm | 0.58 | ** | 0.73 | ** |

5.0–20 µm | 0.82 | ** | 0.73 | ** |

20–200 µm | 0.87 | *** | 0.64 | ** |

R coefficients of the Mantel correlations between the taxonomic dissimilarity matrices from surface and mesopelagic communities and surface and bathypelagic communities, for each of the five size fractions. Higher R values mean that the compositional differences between communities at a given depth were highly correlated (and thus were similar) to the differences between communities from a different depth. Significance of the correlations is stated as follows: ***

*P*< 0.001, ***P*< 0.01, and **P*< 0.05.