Article

A list of the birds of the Bornean group of islands

From Munshipedia, the MBRAS digital historical encyclopedia

A list of the birds of the Bornean group of islands

A.H. Everett, a naturalist working in Sarawak, published this comprehensive avifaunal checklist in 1889, cataloguing 570 bird species across the Bornean archipelago as delimited by a 100-fathom bathymetric boundary encompassing Borneo, Palawan, the Sulu Islands, and intervening islets. The work synthesizes the collections of numerous collectors to establish the first systematic inventory of the region’s birds, identifying species and genera endemic to the group while explicitly acknowledging its provisional character (pp. 86–87).

Summary

Everett’s list is organized taxonomically from order through species, with each entry providing the adopted name, relevant synonyms, and the localities where specimens were recorded. The geographic scope is defined by a line running from the Tambelan Archipelago south of the Great Natuna, northward of Labuan, around Palawan and the Calamianes, through the Macassar Straits, and back via the Carimata Strait (p. 86). This bathymetric criterion—using the 100-fathom line as a proxy for zoological affiliation—was the best available method in the absence of faunal data for many small islands, and Everett concedes the boundaries are “in some degree approximate” (p. 86).

The central analytical contribution is the identification of endemism at both generic and specific levels. Eleven genera are noted as peculiar to Borneo proper, and two (Ptilocichla, Dryococcyx) are restricted to the Palawan sub-group (p. 88). A numbered enumeration of approximately 140 species is presented as apparently confined to the Bornean group, with those restricted to Palawan distinguished by an asterisk (pp. 88–90). Everett anticipates that some of these will prove to occur in Sumatra or the Malay Peninsula as those regions become better known, while further exploration of the highlands of Borneo and Palawan will add genuinely new endemics (p. 90).

The empirical foundation rests on the collections of at least fifteen collectors whose specimens Everett examined or whose records he compiled. The most significant single contribution is that of Mr. Whitehead, whose extensive collection from Kina Balu Mountain (Mount Kinabalu) provided the bulk of highland species, many of which were described as new to science by R.B. Sharpe in concurrent papers in the Ibis (p. 90). Other key sources include Doria and Beccari (Sarawak), Wallace (Sarawak), Low (Labuan), Ussher and Treacher (Labuan and Lawas), Fischer (Central Borneo), Grabowsky (southeast Borneo), Mottley (Banjarmasin), Platen and Steere (Palawan), Lempriere (Marasi Bay), Guillemard (various localities), Pryer (Sandakan), Hose (Baram), Schwaner (southeast Borneo), and Diard (Pontianak).

Key Findings

  • The list enumerates 570 species, spanning from Phylloscopus borealis (no. 1) to Podiceps tricolor (no. 570), organized under the taxonomic framework of the period (Sub-class Aves Carinatae through Order Pygopodes) (pp. 90–206).
  • The Bornean group boundary is defined by the 100-fathom line, encompassing Balabac, Palawan, the Calamianes, Cuyo Islands, Cagayan Sulu, Sibutu, and the Paternoster, Lauriot, and Solombo islets (p. 86).
  • Eleven genera are identified as peculiar to Borneo: Allocotops, Chlocharis, Androphilus, Ptilopyga (Timeliidae); Tricophoropsis, Orcotistes (Brachypodidae); Pityriasis (Laniidae); Chlamydochæra (Campophagidae); Heteroscops (Bubonidae); Lobiophasis (Phasianidae); Hæmatoryx (Tetraonidae) (p. 88).
  • Kina Balu Mountain yielded species recorded at elevations from 1,000 to 12,000 feet, including Cettia oreophila (7,000–12,000 ft.), Merula seebohmi (8,000–12,000 ft.), Chlorocharis æmilæ (7,000–12,000 ft.), and Heteroscops luciæ (9,000 ft.) (pp. 91–173).
  • Cittocincla suavis and C. stricklandi are shown to overlap at Trusan on the mainland opposite Labuan, with the latter replacing the former in Northern Borneo (p. 94).
  • Turtur tigrina is noted as introduced to Labuan by Mr. Low, and Turtur dussumieri and Geopelia striata are likewise considered introduced by native cage-bird trade from Java (pp. 187–188).

Conclusion

Everett’s definitive historical takeaway is that the Bornean group possesses a substantial and distinctive avifauna, with a considerable proportion of species and several genera confined to it, yet the inventory remains necessarily incomplete. He expresses confidence that further exploration of the highlands of Borneo and Palawan will add “many more really peculiar species, and perhaps some genera,” while acknowledging that some currently listed endemics will likely be found elsewhere as adjacent regions are better surveyed (p. 90).

Context

  • Everett was a naturalist based in Sarawak, a British protectorate under the Brooke “White Rajahs,” and the work draws heavily on collections from the Sarawak region and from Whitehead’s expedition to Kina Balu in British North Borneo. His own fieldwork in Sarawak (Bintulu, Sibu, Matang, Trusan, Baram, and surrounding areas) contributed numerous locality records throughout the list.
  • The study represents the first comprehensive attempt to define the avifauna of the Bornean biogeographic group as a coherent unit, predating modern biogeographic frameworks and relying on bathymetric and proximity criteria rather than faunal analysis to delimit the area.

References