Fig. 8: Lagrangian betweenness and plankton diversity.
From: Lagrangian betweenness as a measure of bottlenecks in dynamical systems with oceanographic examples
On the top: BL field calculated for the 20th of Octuber 2009 with an integration time τ of 7 days from model data of the Kuroshio Front. The black solid line is the cruise track while the dots correspond to different sampling sites. The color of the dots represents the data availability at the sampling location, black when both microscopy and Otreococcus clades data are collected and gray when only microscopy is available. On the bottom: scatter plot of BL versus species evenness calculated from microscopy (left panel) and clades (right panel). Each dot is associated with a sampling site. Evenness is calculated as a normalized Shannon entropy from relative abundances. To each site, a betweenness value equal to the average of the field in a circle of 0.2° of radius around the site is assigned, calculated on the exact sampling time. Spearman correlation coefficients (R) and p values (p) are shown in the top-left inset of each scatter plot indicating a significant and positive correlation of evenness with betweenness.
