"Genome Sequencing Study Reveals Hornbill Population History and Conservation Insights"
Conservation Genomics
use of whole-genome sequencing to inform wildlife conservation planning and management
Effective Population Size
statistical measure of a population's genetic diversity, reflecting long-term breeding numbers
Hornbills (family Bucerotidae) are among the most ecologically significant birds of tropical Asia and Africa, recognised by their large, curved beaks and prominent casque structures made of keratin. Of the 32 recognised Asian hornbill species, many are endemic to the forests of South and Southeast Asia, including the Western Ghats, Northeast India, and the Indo-Myanmar biodiversity hotspot. India is home to nine hornbill species, with the *Great Hornbill (Buceros bicornis)* being the most iconic — it is the state bird of Kerala and Arunachal Pradesh and has been a subject of conservation attention for decades.
Conservation concern for hornbills has grown alongside accelerating deforestation, forest fragmentation, and illegal hunting for their casques (used in traditional ornamentation and trade). Their dependence on large, old-growth trees for nesting — hornbills are obligate cavity nesters — makes them acutely sensitive to logging. Historically, conservation strategies relied on field surveys, population counts, and habitat assessments. The application of genomics to wildlife conservation — sometimes called conservation genomics — represents a newer, more powerful toolkit that can reveal population structure, genetic diversity, and evolutionary history in ways that field observation alone cannot.
India's institutional capacity in this domain has grown through bodies like the CSIR-Centre for Cellular and Molecular Biology (CCMB), Hyderabad, which has previously contributed to genomic studies of tigers, snow leopards, and other threatened species. The Nature Conservation Foundation (NCF), Mysore has been a leading field-research organisation on hornbill ecology in India for over two decades.
Conservation genomics uses whole-genome sequencing to decode an organism's complete genetic blueprint. Unlike earlier techniques that sampled only a fraction of the genome, whole-genome sequencing captures the full spectrum of genetic variation — including allelic diversity, gene family expansions, and signals of past demographic change. One of its most powerful applications is Pairwise Sequentially Markovian Coalescent (PSMC) analysis, a method that reconstructs historical population sizes from a single individual's genome by tracing patterns of genetic variation back through time. This allows scientists to infer how a species' population fluctuated over thousands or millions of years — long before any human records existed.
The study examined four Asian hornbill species: the Great Hornbill, *Wreathed Hornbill (Rhyticeros undulatus), Rufous-necked Hornbill (Aceros nipalensis), and Malabar Pied Hornbill (Anthracoceros coronatus)*. Before this research, complete genome data existed for only two of the 32 recognised Asian hornbill species — a significant gap given the conservation pressures the family faces. …
In which of the following regions of India are you most likely to come across the 'Great Indian Hornbill' in its natural habitat?
Which of the following is not a bird?
Consider the following statements about hornbills in India:
1.The Great Hornbill is the state bird of both Kerala and Arunachal Pradesh.
2.Hornbills are obligate cavity nesters, requiring large old-growth trees for breeding.
3.All hornbill species found in Asia are classified as 'Vulnerable' on the IUCN Red List.
4.Hornbills are referred to as 'farmers of the forest' due to their role as seed dispersers.
Which of the statements given above are correct?
The Pleistocene epoch, referenced in recent hornbill genomic research, is correctly described by which of the following?
With reference to the recent genomic study on Asian hornbills, which of the following best explains why the Wreathed Hornbill maintained significantly larger population sizes than the Great Hornbill and Rufous-necked Hornbill throughout much of its evolutionary history?
Consider the following pairs — Hornbill species and their IUCN Red List status:
1.Great Hornbill — Vulnerable
2.Wreathed Hornbill — Endangered
3.Rufous-necked Hornbill — Vulnerable
4.Malabar Pied Hornbill — Near Threatened
How many of the pairs given above are correctly matched?
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