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Figure 2 | BMC Biology

Figure 2

From: Testing ecological theories with sequence similarity networks: marine ciliates exhibit similar geographic dispersal patterns as multicellular organisms

Figure 2

Mock sequence similarity networks displaying endemism and cosmopolitan distribution of ciliates. A) Schematic pattern of a GCC colored to reflect the origin of sequences in case of endemism. Each supernode corresponds to a LC consisting of a group of sequences. Exemplary LC composition is described in the insets in squared boxes. Each node color in these insets corresponds to a given hypothetical sampling depth (that is, red for depth A, green for depth B). Each supernode color represents the proportion of sequences from different sampling depths in a LC (see color bar ranging from green (100% sequences of depth B) to red (100% sequences of depth A). B) Schematic pattern of the same GCC colored to reflect the origin of the sequences in case of a cosmopolitan distribution of ciliates. Same color code as above. Intermediate colors of most LCs reflect the fact that highly similar sequences were detected at different depths. C) Schematic pattern of CCs, their node colors reflecting the origin of the sequences. As above, each color corresponds to a given sampling depth. Some structure is visible when either all similar sequences originate from the same depth (left), or when sequences from a particular depth cluster together within the component (middle). In case of a widespread dispersal across sampling depths, no structure with regard to the color code can be observed (right). D) Schematic pattern of a CC, describing closeness and shortest path. Two distinct nodes are highlighted. One in the center (grey) and one in the periphery (lilac) of the CC, exhibiting high and low closeness, respectively. Red edges connecting the highlighted nodes display the shortest path between these two particular nodes. See Table 1 for further explanations. CCs, connected communities; GCC, giant connected components; LC, Louvain communities.

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