Which response variable (on the y axis) did not increase with plant species richness?

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Page 2

From: Species richness and composition differ in response to landscape and biogeography

1. Mean values (Mean), standard deviation (SD), minimum (Min), and maximum (Max) for species richness, island area (hectare), island height (metres), distance to mainland (kilometres), habitat heterogeneity, and structural connectivity (hectare) for the 112 islands in Stockholm archipelago, Baltic Sea