Figure 2.

Population genetic structure of Pseudo-nitzschia multistriata in the Gulf of Naples. The different colors mark samples collected in different periods. (a) Similarity network: nodes represent multilocus genotypes (MLGs); the width of lines connecting nodes is proportional to allelic similarity between nodes; colors identify the period of peak abundance of each MLGs (green=2013 pre-bloom; pink=2013 summer bloom; orange=2013 autumn bloom; blue=2014); the size of the label of each node is proportional to the level of connection with neighboring nodes (weighted degree). (b) Trends of P. multistriata cell abundances at LTER-MC; sampling dates for population genetics are marked with a black circle. (c) Linkage disequilibrium (parameterized by the association index I^S_A); bright gray circles indicate not statistically significant values. (d) Genotypic richness (R). (e) Frequency of MLG #86.