Abstract:
:We examined the response of vascular plant species richness to long-term habitat loss and fragmentation of Estonian calcareous grasslands (alvars). The current number of habitat specialist species in 35 alvars was not explained by their current areas and connectivities but it was explained by their areas and connectivities 70 years ago (R(2) = 0.27). We estimated the magnitude of extinction debt in local communities by assuming an equilibrium species richness in 14 alvars that had lost only a small amount of area and by applying this model to the remaining alvars, in which the average area has declined from 3.64 km(2) in the 1930s to 0.21 km(2) at present. The extinction debt estimated for individual alvars was around 40% of their current species number. Our conclusions are applicable to temperate grasslands in general, which have lost much area because of agricultural intensification and cessation of traditional management.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Helm A,Hanski I,Pärtel Mdoi
10.1111/j.1461-0248.2005.00841.xsubject
Has Abstractpub_date
2006-01-01 00:00:00pages
72-7issue
1eissn
1461-023Xissn
1461-0248pii
ELE841journal_volume
9pub_type
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