Thorn
Scrubs
These
forests are found in the driest, arid regions of the island in the
North-West and in the South East where the average annual rainfall
is less then 1,500 mm with a dry seven months.
Thorn scrubs
are secondary forests, developed as a result of degradation of Monsoon
Forests. lf left undisturbed, they will revert, through ecological
succession, to Monsoon Forests.
These forests
have only one layer of scattered, semi-deciduous trees ,which are
only about five to six metres in height and a very characteristic
thorny undergrowth of bushes.
These provide
refuges for wildlife, and are useful for the movement of wide ranging,
vagile species like Elephants (Elephas maximus), leopards (Panthera
pardus) and Sloth bears (Melursus ursinus).
There are scattered,
small patches distributed all over the dry zone, very clearly sited
on the peripheries of the current distribution of Monsoon forests,
indicating secondary growth after exploitation at forest edges.
These forests,
like Monsoon Forests are under threat from slash and burn agriculture.
KEY
FOR THORN SCRUB
- Orange Breasted
Green Pigeon (Trron bicincta)
- Eurasian
Collarea Dove (Indian Ring Dove) (Streptopedia decaocto)
- Black Naped
Hare (Lepus nigricolis)
- Barking
Deer (Muntiacus muntjac)
- Eurasian
Hoopoe (Upupa epops)
- Elephant
(Elephas Maximus)
- Zyzyphus
spp, a tree species in Thorn Scrubs
- Golden Jackal
(Canis aureus)
- Black Drongo
(Dicrurus macrocercus)
- Rain Quail
(Black- breasted Quail) (Coturnix coromandelica)
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