Fig 1.
Map of the sampling location of each sequence used in this study.
Fig 2.
Venn diagram of shared MOTUs among the three oceans: Arctic (pink), Atlantic (green) and Pacific (blue).
The number of MOTUs in each group and shared between groups is indicated. A: MOTUs were defined with a 3% threshold. B: MOTUs were defined with a 16% threshold. C: MOTUs were defined with a 4% threshold.
Table 1.
Number of MOTUs found according to the method used.
Fig 3.
Distribution of MOTUs by family and ocean.
MOTUs are defined based on a threshold of A) 3%, B) 4%, C) 16%. Atlantic MOTUs are represented in green, Pacific MOTUs in blue and Arctic MOTUs are in pink.
Table 2.
Species found in the three oceans.
Fig 4.
Number of MOTUs identified to the family level according to the species threshold used (3% light grey; 4% grey and 16% dark).
Fig 5.
Boxplot distribution of the COI K2P distances for the 10 selected families representative of the Amphipoda order at the intraspecies (S–light blue), intragenus (G–blue) and intrafamily (S–dark blue) levels.
Median (central bar), position of the upper and lower quartiles (central box) and extremes of the data (dots) are represented. Black lines represent different thresholds used for discriminating species: long dash = 0.16 substitution/site [10]; dashed line = 7% of divergence (this study) and solid line = 3% of divergence [53].