Figure 4
From: Insights on the drivers of genetic divergence in the European anchovy
Results of the Lagrangian analysis. (a–d) Lagrangian Probability Density Functions of particles presence after an advection time of 30 days for four different released sites selected along the Tyrrhenian coast. LPDFs for CVL/CAP (or SPL/NAP) are inferred from the combined data when particles are released both in CVL and CAP (of SPL and NAP respectively). (e) Connectivity matrix between Tyrrhenian sites, where adult anchovies were collected. Each box gives the probability that a particle released in a region in X-axis reaches a region in Y-axis. Thus, a value of 10^4 means that over 10^4 released particles, one particle reached the site of interest. Results show that even though the Gulf of Naples exhibit a strong retention power, no preferential areas exist along the Tyrrhenian coast. The small probability of connectivity for long distanced sites is to be mitigated by the fact that billions of larvae are advected in the sea. Thus, dispersal can not explain the genetic separation between the two ecotypes. Maps in Fig. 4 were generated using MATLAB software Version 7.7.0.471 (R2008b); www.mathworks.com.
