Species included in the BREAKPOINT sets for the main pan-European indicator (Main), the equivalent indicator drawn only from species currently covered by PECBMS (Main-PECBMS) and the forest-type specific and regional indicators.

Species' sensitivity scores are calculated as their niche breadth*reliance, with higher values indicating species less sensitive to changes in resource abundance or availability. Equivalent, PECBMS-only BREAKPOINT sets for the forest type and region indicators are presented in Table S7. ‘0/1’ identifies species that were interchangeable in any given breakpoint set due to equal sensitivity scores – see specific note for each indicator for further details.*Species also included in current pan-European forest bird indicator (for full list seehttp://www.ebcc.info/index.php?ID=459).aEither species could be included.bAny one of three could be included.cAny two of three could be included.