Forest cover loss threatens hornbills in Arunachal

Study based on satellite imagery is seen as a step towards achieving accurate forest cover loss estimates

Updated - December 03, 2021 08:47 am IST

Published - August 13, 2020 02:03 am IST - GUWAHATI

A file picture of Pied Hornbills.

A file picture of Pied Hornbills.

A study based on satellite data has flagged a high rate of deforestation in a major hornbill habitat in Arunachal Pradesh.

Using fine-scale satellite imagery, a trio of ecologists assessed the changes in forest cover of the 1,064 Papum Reserve Forest (RF) adjoining the Pakke Tiger Reserve as well as a part of Assam affected by illegal felling and ethnic conflict.

Papum RF is a nesting habitat of three species of the large, colourful fruit-eating hornbills: Great, Wreathed and Oriental Pied. The 862 Pakke reserve houses a fourth species, the Rufous-Necked.

Referred to as ‘forest engineers’ or ‘farmers of forest’ for playing a key role in dispersing seeds of tropical trees, hornbills indicate the prosperity and balance of the forest they build nests in.

The study by Chintan Sheth of the Bengaluru-based National Centre for Biological Sciences and Aparajita Datta and Devathi Parashuram of the Mysuru-based Nature Conservation Foundation was published in Silva Fennica , a forest journal of Finland.


“The satellite data pointed to alarming deforestation rates in Papum RF with annual loss rates as high as 8.2 as per estimates from 2013-2017 where forest cover declined to 76% of the total RF area,” Mr. Sheth said.

“Our results show the loss and degradation of critical hornbill habitat in the biologically rich forests of the Indian Eastern Himalaya, underscoring the need for habitat conservation efforts,” he added.

The ecologists assessed the habitat loss due to illegal logging within a 1 km radius around 29 hornbill nest trees. From 2011 to 2019, the forest cover was found to have declined from 38.55 to 21.94 around these trees.

Hornbills used to be hunted for their casques — upper beak — and feathers for adorning headgear despite being cultural symbols of some ethnic communities in the northeast, specifically the Nyishi of Arunachal Pradesh. But a 20-year-old conservation programme entailing the use of fibre-glass beaks defused the threat to the birds to a large extent.

Illegal logging, however, has however led to fewer tall trees where the birds nest. While the protected areas such as Pakke are better guarded, the forests are often under pressure due to agricultural expansion, conversion to plantations or logging.

According to the Global Forest Watch 2020 report, Arunachal Pradesh lost 1,110 of primary forest from 2002-2019.

“Forests still cover 74% of the total land area of the State, and steps are being taken to stop felling,” a senior forest officer said.

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