Assertion: grouse's number | /r/CapableOf | dip towards the middle of this period
Facets:
value: markedly
type: DEGREE
value: to recover to its previous level
type: PURPOSE
value: in orkney
type: LOCATION
Source sentences:
text: In Orkney, for instance, the number and productivity of breeding females dipped markedly towards the middle of this period (Sim et al. 2001), only to recover to its previous level within a relatively short space of time (Sim et al. 2007).