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Bringing Back Manas

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1988), whereas their equities are presented as Hill’s<br />

modified ratio (Hill 1973). Means ± standard errors<br />

are presented throughout.<br />

Results<br />

Vegetation structure and composition<br />

A total of 136 tree species (annexure 6), 53 shrub<br />

species (annexure 13) and 61 herb species (annexure<br />

19) were recorded during survey. Tree species along<br />

with their densities in dry deciduous miscellaneous<br />

forest, moist deciduous miscellaneous forest,<br />

evergreen forest, sal forest and scrub forest are given<br />

in annexures 7, 8, 9, 10 and 11 respectively.<br />

Maximum tree species were recorded from dry<br />

deciduous miscellaneous forest and moist deciduous<br />

miscellaneous forest (71 species from each forest type)<br />

and mainly represented by Dillenia pentagyna,<br />

Lagerstroemia parvilora, Castanopsis indica. Minimum<br />

species richness (12) was observed in scrub forests where<br />

the most common tree species was Moringa angustifolia.<br />

Fifty-two and forty species were recorded from<br />

evergreen forest and sal forest, respectively. The sal<br />

forests mostly had species like Shorea robusta associated<br />

with Albizia amara, Dillenia pentagyna and Terminalia<br />

arjuna. The evergreen forests mainly had lapchey, Mesua<br />

ferea and Moringa angustifolia.<br />

Average tree species richness, diversities and equities<br />

in various forests types in the study area are given in table<br />

22. Species effort curves for tree species for dry deciduous<br />

miscellaneous forest, sal forest, moist deciduous<br />

miscellaneous forest, evergreen forest and scrub forest<br />

(annexure 34) seem to tend upright, implying<br />

that tree inventorisation in the study area is still<br />

incomplete and requires further investigations.<br />

It is obvious from the table 19 that species richness<br />

was highest in the evergreen forests followed by sal<br />

forests. Scrub forests were the most impoverished in<br />

terms of richness.<br />

Shrub species with their densities recorded from<br />

dry deciduous miscellaneous forest, moist deciduous<br />

miscellaneous forest, evergreen forest, sal forest and<br />

scrub forest are given in annexures 16-20. Species<br />

effort curves for shrubs in dry deciduous<br />

miscellaneous forest, moist deciduous miscellaneous<br />

forest, sal forest, evergreen forest and scrub forest<br />

(annexure 34) are tending upright. Average shrub<br />

species richness, diversities and equities in various<br />

forests types in the study area are given in table 20.<br />

Shrub richness was highest in the evergreen forests<br />

<strong>Bringing</strong> <strong>Back</strong> <strong>Manas</strong><br />

followed by the moist deciduous miscellaneous type.<br />

Scrub forest, surprisingly had the least shrub richness.<br />

Herb species with their densities recorded from dry<br />

deciduous miscellaneous forest, moist deciduous<br />

miscellaneous forest, evergreen forest, sal forest and<br />

scrub forest are given in appendices 19-23. Average<br />

herb species richness, diversities and equities in<br />

various forests types in the study area are given in<br />

table 21. Species effort curves for herbs in dry<br />

deciduous miscellaneous forest, moist deciduous<br />

miscellaneous forest, sal forest, evergreen forest and<br />

scrub forest (annexure 34) are tending upright.<br />

Highest herb richness was recorded from sal<br />

forests followed by the dry deciduous forests.<br />

Bird communities<br />

A total of 270 birds were recorded during the<br />

course of present study (annexure 24) from the study<br />

area under the jurisdiction of BTC. Of these, 246 were<br />

recorded on transects during point counts and the rest<br />

outside the point transects. The latter category<br />

includes species such as blue rock thrush (Monticola<br />

solitarius), blue-eared bee-eater (Nyctyornis athertoni),<br />

crested serpent eagle (Spilornis cheela), Gadwall ( Anas<br />

strepera), Himalayan tree creeper (Certhia<br />

himalayana), Indian river tern (Sterna aurantia), kaleej<br />

pheasant (Lophura leucomelana), koel (Eudynamys<br />

scolopacea), Indian jungle nightjar (Caprimulgus<br />

indicus), marsh sandpiper (Tringa stagnatilis),<br />

moorhen (Gallinula chloropus), pheasant-tailed jacana<br />

(Hydrophasianus chirurgus), red-breasted falconet<br />

(Microhierax caerulescens), shikra ( Acipiter badius),<br />

spoonbill ( Platalea leucorodia), spotted-winged<br />

grosbeak (Cocothraustes melanozanthos), tree sparrow<br />

Fig.65 Great Indian hornbill(Buceros bicornis)<br />

Ultapani, Greater <strong>Manas</strong>, Assam<br />

71

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