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SWIFTLETS of MALAYSIA ,[object Object],[object Object]
SWIFTLETS (COLLOCALIINI) of MALAYSIA RESEARCH OPPORTUNITIES 2010 Photo: Lim Chan Koon
SWIFTLETS of MALAYSIA ,[object Object],[object Object],[object Object],[object Object]
Swallows share the skies with swiftlets, but are unrelated
Unlike swallows, swiftlets cannot perch.  They feed (on aerial arthropods)  and drink on the wing. Lim Chan Koon
APODIFORMES APODI  TROCHILI   Lim Chan Koon Apodidae Hemiprocnidae T rochilidae Tree-swifts  Swifts  Hummingbirds
APODIDAE APODINAE  CYPSELOIDINAE   Lim Chan Koon Chaeturini Collocaliini Apodini Swiftlets  Spinetails  Typical swifts
COLLOCALIINI   Lim Chan Koon Aerodramus Collocalia Hydrochous Glossy  Grey-brown  Giant swiftlet swiftlets  swiftlets  /Waterfall swift Schoutedenapus  Africa  2 species
Diversity peaks World range of swiftlets: Indo-Pacific Mascerenes Eastern Himalayas New Caledonia Hawaii Indo-Malayan region
World range of swiftlets: Indo-Malayan Mascerenes A erodramus unicolor New Caledonia
SWIFTLETS of MALAYSIA ,[object Object]
Diversity of swiftlets of  Indian ocean, Asia & Australasia [nos. of species] [1] [1] [1] [ <  1  >  ] [3] [  <  [  8  ]   >  ] [ 3 ] [  4 ] [  7   ] [1] [ 6  ] [1] Migratory
Hot-spot Malaysia 3 genera, 8 species of swiftlets
Apodidae (swifts) Collocaliini (swiftlets) ,[object Object],[object Object],[object Object],[object Object]
Apodidae (swifts) Collocaliini (swiftlets) ,[object Object],[object Object],[object Object],[object Object]
Waterfall swift   (also called the “giant” swiftlet Breeding records Sight records
Waterfall swift,  Hydrochous gigas
The nest of the Giant Swiftlet is built of mossy vegetation, loosely held together by soft, moist salivary material.  This swiftlet lays a single egg Photo:  J-H. Becking
The single nestling of the giant swiftlet.   The plumose down is unique among swiftlets Photo: J-H. Becking
Apodidae (swifts) Collocaliini (swiftlets) ,[object Object],[object Object],[object Object],[object Object]
troglodytes esculenta Plain tailed linchi Glossy swiftlets Two species in Malaysia White spots on tail feathers
Speciation among Glossy swiftlets,  Collocalia C. esculenta  L. 1758   C. linchi  H & M 1834  C. troglodytes  Gray 1845 All build self-supporting cup-like nests of strands of plant material, fixed with a basal band of edible nest ‘cement’
Collocalia  : glossy swiftlets 1. White-bellied swiftlets  C. esculenta
Collocalia  : glossy swiftlets 1. White-bellied swiftlets  C. esculenta cyanoptila
Key character: a single feather tuft on the hind toe (hallux) Collocalia esculenta cyanoptila
Collocalia linchi,  Linchi  swiftlet :  Java, part of Sumatra & Kinabalu, Sabah Green glossed upperparts No tuft on hallux
Apodidae (swifts) Collocaliini (swiftlets) ,[object Object],[object Object],[object Object],[object Object]
Black-brown swiftlets  Aerodramus Photos: Lim Chan Koon
Or  “Mossy” nests ,[object Object],[object Object]
Six swiftlets of interior Borneo: Comparative wing lengths Scale in mm Chris Stimpson Diagram by C. Stimpson
Speciation among ‘mossy’ nest swiftlets Permanently soft, glutinous salivary nest-cement Lim Chan Koon
A.vanikorensis  Q & G 1830 A.salanganus  Streubel 1848 * * *  = type locality The two allopatric “mossy-nest” swiftlets
There is only one species of swiftlet building the ‘Black’ nests this is  Aerodramus maximus Lim Chan Koon
Hevily feathered tarsus =  A. maximus Naked (or lightly feathered) tarsus = others Field characters  2.
Black-nest swiftlet  Aerodramus maximus New discovery: Sembilan Is Bau/Serian Tj Datu Tatau/Kakus NIAH   Eastern Sabah A. m. maximus  A. m. lowi
[object Object],[object Object]
Pulau Gua, Sarawak
[object Object],Pulau Gua = ‘Cave island’, Sarawak
A. maximus lowi  at Tjg Datuk, Sarawak
Glossy swiftlets Collocalia Linchi Black-brown,   Aerodramus Giant swiftlet  Hydrochous Black nest White nest Mossy nest Bracket vegetable nest Indo-Malayan swiftlets
SWIFTLETS of MALAYSIA ,[object Object]
White nests ( ‘vestitus’) Salai cave, Baram, Sarawak Photo Lim Chan Koon
White nests are highest value These nests are composed almost entirely of edible nest-cement, with no more than a few feathers adhering to or incorporated, Raw nests may be worth RM 7000 per kg of ~100 nests
SWIFTLETS of MALAYSIA ,[object Object],[object Object],[object Object]
There are also two species of “white-nest” swiftlets This is the typical dark-rumped form  Aerodramus f. fuciphagus  of Java
White-nest swiftlets from Sarawak  Aerodramus fuciphagus vestitus
AMNH 634703 f Coll. H.C. Robinson, Koh Pennan (Phangan Is) 13 June 1913. L Wing 112 No moult. Grey rumped, or Germain’s swiftlet  Aerodramus germani Coasts and islands from Hainan (China) & Vietnam, Thailand, Malaysia, to Andaman Is  Grey rump, with dark shaft streaks
[object Object],Grey-rumped forms Topotypical  Aerodramus  g.  germani Satang island, Sarawak (W. Borneo) Berhala island, Sandakan (N. E. Borneo) Mantanani Is., N W Borneo
Skins from Satang Kecil (1933)
Young bird from Satang Kecil, Sarawak Turtle Is. Collected in 1957
White-nest swiftlet from Gomantong cave , Sabah
Two skins from Juara Bay Tioman island (1907)
P. Condore Type locality Malacca Satang Island Mantanani Is. Berhala Is. Maratua Is.  (ssp.  perplexus ) Southern and western limits of Grey-rumped swiftlets  Aerodramus germani  in Malaysia P. Tioman Gomantong Sembilan Is
Batu Putih, Kepulauan Sembilan Photo: Lim Tze Tshen
 
“ White Rock”  (Sembilan Is.)   Eleven nests of    Grey-rumped    swiftlet on    7/4/2010
SWIFTLETS (COLLOCALIINI) of MALAYSIA RESEARCH OPPORTUNITIES 2010 1. Conservation issues Photo: Lim Chan Koon
Karst limestone of interior Borneo Surprisingly, no records of  Aerodramus  swiftlets in any cave in Msia Semenanjung Caves in limestone and other rocks are the natural nesting sites of swiftlets.
White cliffs Dizzy heights Twisty tunnels  The work of nest collectors is very hazardous
A. (f.) vestitus Salai cave, Baram, Sarawak Rarely can nests be gathered by hand Lim Chan Koon
Walkways in cave interiors are made of natural materials Panguma cave, Niah, Sarawak Black-nest colony
Nuar at Panguma Fixed climbing aids also use available natural materials
Johari Top of the pole Sarawak Museum
Collecting head at the end of the pole  (penyulok ) Huge loss of life – eggs and young birds :     Kayan river, Kalimantan Timur George Nawan
SWIFTLETS (COLLOCALIINI) of MALAYSIA RESEARCH OPPORTUNITIES 2010 1. Identity of house farmed white-nest swiftlets Photo: Lim Chan Koon
House-farm buildings are now a familiar part of the street scene  Is this the solution to sustainbility ?
HOUSE-FARMING  THE LATEST DOMESTICATION Intensive management of housed swiftlets began in Java, Indonesia, in the 1970s
Glossy swiftlets naturally colonise cave entrances, rock-shelters, tree hollows and, by extension, culverts, bridges, open buildings and many other man-made structures ,[object Object],[object Object]
In Java, especially, skills developed in transforming buildings naturally colonised by glossy swiftlets into white-nest houses
Egg transfer
Nest management
House in transition C. linchi  > A. fuciphagus Glossy swiftlet nests White nests
New nest house at Bayang Kara, Kaltim. Original wooden house with  C. esculenta  nests enclosed in concrete shell; eggs imported from W. Java Ventilation holes Cladding, for coolness Javanese technology exported
Spontaneous occupation of buildings by edible/white-nest swiftlets Penang & Butterworth Kuala Terengganu Bintulu Melaka Singapore Java (multiple instances) Banjermasin Since 1890
Spontaneous colonisations of buildings in Pen. Malaysia Penang  (1947) K. Terengganu (1974) Kuala Lumpur (1948)  Known  start dates Melaka (1953) Singapore (1935)
Spontaneous colonisation of buildings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Since 1990s swiftlet-farming has relied on the direct attraction of free-flying birds into specially constructed houses
Tower block North Sumatra New build (2002)
Vertiginous new structure in  Pak Phanang, S. Thailand
A young bird at Miri, Sarawak Resembles neither of the wild species of Borneo
An adult from Kuching house
House-farmed white-nest swiftlets of Sarawak do not resemble either of the wild species Aerodramus germani  on islands Aerodramus (f.) vestitus  of inland caves
Conclusions & questions (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A new domestication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Spontaneous colonisation of buildings ,[object Object],[object Object],[object Object],[object Object]
Pak Phanang S. Thailand
A bird that flew into a house in Taiping Presumably from a local farm-house
Adult bird no. 2, Penang 29 Oct 08
Adult bird no. 3, Penang 29 Oct 08
Adult bird Kota Bahru Oct 08
Examples from other localities are similar Singapore ,[object Object],[object Object]
Neighbour Joining Tree based on partial  Cyt b  region  Sibu   (03) Setiawan   (SW102) Setiawan   (SW01) Setiawan   (SW101) Kuantan   (KT152) Endau   (EN191) Endau   (EN193) Rompin   (RP61) Selangor   (SB32B) Selangor   (SB32A) Sumatra   ( SM77) Sumatra   (SM78) Sumatra   (SM77a) Sumatra   (SM76)   vestitus Goh Wei Lim Baram   (LS01) Baram   (LS09 ) Kuantan   (KT41B ) Setiawan   (SW02) Kuantan   (KT41A) Kuantan   (KT151) Endau   (EN192 ) A. maximus 66 95 83 49 59 0.005
SWIFTLETS of MALAYSIA ,[object Object],[object Object],[object Object],[object Object],[object Object]
SWIFTLETS of MALAYSIA ,[object Object],[object Object],[object Object]
Even the  most  successful house-farm managers are ignorant of basic biology of swiftlets
Malaysian swiftlets: statistics for wild birds  (averages ) Species Ad. Wt. (g) Egg size (mm) Clutch Incub’n (days) Fledge (days) Black-nest 18 25 x 16 1 28 59 White-nest ( vestitus) 12.5 20 x 14 2 25 45 Mossy- nest 12.5 21 x 14 2 23 48 Glossy ( cyanoptila ) 7.5 17 x 11 2 22 42
Black-nest swiftlet:  Slow nestling growth Body mass (g) Wing length (mm) Adult Kang  et al.
White-nest swiftlet:  eggs & nestlings  Salai cave, Sarawak, 1997-98  1997 1998 Eggs Nestlings Lim Chan Koon
White-nest Swiftlets: % undisturbed, marked nests containing at least one egg =  breeding.  3 Sarawak caves Lim Chan Koon
SWIFTLETS of MALAYSIA ,[object Object],[object Object],[object Object]
Inactive gland Active gland Black nest swiftlet
FAQ  1 What is the edible substance ? ,[object Object],[object Object],[object Object],[object Object],Lim Chan Koon
Commercial nests “ C. brevisrostris” Apus pacificus Apus affinis Human growth hormone
Repackaged as a novel product
The Malaysian government has recognised that the husbandry of swiftlets in houses falls into the remit of the Veterinary Department, including issues such as animal welfare and cruelty
Metabolic demands on  breeding swiftlets ,[object Object],[object Object],[object Object]
Breeding cycle & salivary gland activity Females Males Gonads active Salivary glands inactive Gonads inactive Salivary glands active
White-nest :  coordinated breeding Lim Chan Koon
A. (f.) vestitus : ‘Porcupine’ stage
Metabolic demands on  breeding swiftlets ,[object Object],[object Object],[object Object],[object Object]
Metabolic demands on  breeding swiftlets ,[object Object],[object Object],[object Object],[object Object]
Malaysia (2-5 o  N) Annual breeding cycle and moult All birds
Black-nest swiftlet   at Niah   Annual moult of the primary tract
A. (f.) vestitus : breeding & moult ***  1 st  primaries moulted Last primaries moulted  *** Lim Chan Koon
Black-nest swiftlets at Sarang:  moult & breeding % nests with eggs Count of shed feathers Lim Chan Koon
SWIFTLETS of MALAYSIA ,[object Object],[object Object],[object Object]
1958 sonograph of echo-locating calls of  Aerodramus maximus  < - - -  2  seconds  -  -  -  > Single clicks, very short duration : 0 – 15 kHz ‘white sound’ A||||||||||||||V 20 kHz
 
Why do swiftlets prefer to build their nests in corners ?
Corner nests are 3 rd -grade in the market, which prefers 180º nests
Studies of behaviour at the cave mouth shows that swiftlets feed only during daylight hours, and that weather (especially rain) is an important determinant of the birds’ activity.  It is likely that prolonged rainy weather is detrimental to their ability to feed
The influence of weather on behaviour
Analysis of food balls fed to nestlings, compared with passive samples of aerial insects, shows that swiftlets are selective feeders, taking a very wide variety of arthropod prey
 
Could managed, selective breeding of house-farmed birds improve the stock, e.g., female fecundity, nest weight or quality, disease resistance  ?
Outstanding issues ,[object Object],[object Object],[object Object],[object Object]
In the scenario of this newest domestication,  with the backing of sound husbandry and good science ,  rational planning can ensure the perpetuation and sustainable management of this important biological resource.
 
Thank you ,[object Object],[object Object],A bit of science on the subject
Carpometacarpus of a   swiftlet Scale in mm Chris Stimpson
Carpometacarpus: Fossils from Niah cave Scale in mm Chris Stimpson
Carpometacarpus: Fossils from Niah cave Scale in mm Chris Stimpson
Gathorne Hardy MA PhD PNBS(K) (5 th  Earl of Cranbrook) Sarawak Museum (1956 - Yayasan Siswa Lokantara Universiti Malaya Niah cave excavations “Expeditions” (1964 – 92), to  Kinabalu, Gn Benom, Vanuatu, Gn Mulu, Belalong (Brunei)  Chairman, English Nature (1990-98), Chairman Entrust, Regulator of Environmental bodies under UK Landfill tax regulations (1996)

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swiflet research by Lord Cranbrook

  • 1.
  • 2. SWIFTLETS (COLLOCALIINI) of MALAYSIA RESEARCH OPPORTUNITIES 2010 Photo: Lim Chan Koon
  • 3.
  • 4. Swallows share the skies with swiftlets, but are unrelated
  • 5. Unlike swallows, swiftlets cannot perch. They feed (on aerial arthropods) and drink on the wing. Lim Chan Koon
  • 6. APODIFORMES APODI TROCHILI Lim Chan Koon Apodidae Hemiprocnidae T rochilidae Tree-swifts Swifts Hummingbirds
  • 7. APODIDAE APODINAE CYPSELOIDINAE Lim Chan Koon Chaeturini Collocaliini Apodini Swiftlets Spinetails Typical swifts
  • 8. COLLOCALIINI Lim Chan Koon Aerodramus Collocalia Hydrochous Glossy Grey-brown Giant swiftlet swiftlets swiftlets /Waterfall swift Schoutedenapus Africa 2 species
  • 9. Diversity peaks World range of swiftlets: Indo-Pacific Mascerenes Eastern Himalayas New Caledonia Hawaii Indo-Malayan region
  • 10. World range of swiftlets: Indo-Malayan Mascerenes A erodramus unicolor New Caledonia
  • 11.
  • 12. Diversity of swiftlets of Indian ocean, Asia & Australasia [nos. of species] [1] [1] [1] [ < 1 > ] [3] [ < [ 8 ] > ] [ 3 ] [ 4 ] [ 7 ] [1] [ 6 ] [1] Migratory
  • 13. Hot-spot Malaysia 3 genera, 8 species of swiftlets
  • 14.
  • 15.
  • 16. Waterfall swift (also called the “giant” swiftlet Breeding records Sight records
  • 17. Waterfall swift, Hydrochous gigas
  • 18. The nest of the Giant Swiftlet is built of mossy vegetation, loosely held together by soft, moist salivary material. This swiftlet lays a single egg Photo: J-H. Becking
  • 19. The single nestling of the giant swiftlet. The plumose down is unique among swiftlets Photo: J-H. Becking
  • 20.
  • 21. troglodytes esculenta Plain tailed linchi Glossy swiftlets Two species in Malaysia White spots on tail feathers
  • 22. Speciation among Glossy swiftlets, Collocalia C. esculenta L. 1758 C. linchi H & M 1834 C. troglodytes Gray 1845 All build self-supporting cup-like nests of strands of plant material, fixed with a basal band of edible nest ‘cement’
  • 23. Collocalia : glossy swiftlets 1. White-bellied swiftlets C. esculenta
  • 24. Collocalia : glossy swiftlets 1. White-bellied swiftlets C. esculenta cyanoptila
  • 25. Key character: a single feather tuft on the hind toe (hallux) Collocalia esculenta cyanoptila
  • 26. Collocalia linchi, Linchi swiftlet : Java, part of Sumatra & Kinabalu, Sabah Green glossed upperparts No tuft on hallux
  • 27.
  • 28. Black-brown swiftlets Aerodramus Photos: Lim Chan Koon
  • 29.
  • 30. Six swiftlets of interior Borneo: Comparative wing lengths Scale in mm Chris Stimpson Diagram by C. Stimpson
  • 31. Speciation among ‘mossy’ nest swiftlets Permanently soft, glutinous salivary nest-cement Lim Chan Koon
  • 32. A.vanikorensis Q & G 1830 A.salanganus Streubel 1848 * * * = type locality The two allopatric “mossy-nest” swiftlets
  • 33. There is only one species of swiftlet building the ‘Black’ nests this is Aerodramus maximus Lim Chan Koon
  • 34. Hevily feathered tarsus = A. maximus Naked (or lightly feathered) tarsus = others Field characters 2.
  • 35. Black-nest swiftlet Aerodramus maximus New discovery: Sembilan Is Bau/Serian Tj Datu Tatau/Kakus NIAH Eastern Sabah A. m. maximus A. m. lowi
  • 36.
  • 38.
  • 39. A. maximus lowi at Tjg Datuk, Sarawak
  • 40. Glossy swiftlets Collocalia Linchi Black-brown, Aerodramus Giant swiftlet Hydrochous Black nest White nest Mossy nest Bracket vegetable nest Indo-Malayan swiftlets
  • 41.
  • 42. White nests ( ‘vestitus’) Salai cave, Baram, Sarawak Photo Lim Chan Koon
  • 43. White nests are highest value These nests are composed almost entirely of edible nest-cement, with no more than a few feathers adhering to or incorporated, Raw nests may be worth RM 7000 per kg of ~100 nests
  • 44.
  • 45. There are also two species of “white-nest” swiftlets This is the typical dark-rumped form Aerodramus f. fuciphagus of Java
  • 46. White-nest swiftlets from Sarawak Aerodramus fuciphagus vestitus
  • 47. AMNH 634703 f Coll. H.C. Robinson, Koh Pennan (Phangan Is) 13 June 1913. L Wing 112 No moult. Grey rumped, or Germain’s swiftlet Aerodramus germani Coasts and islands from Hainan (China) & Vietnam, Thailand, Malaysia, to Andaman Is Grey rump, with dark shaft streaks
  • 48.
  • 49. Skins from Satang Kecil (1933)
  • 50. Young bird from Satang Kecil, Sarawak Turtle Is. Collected in 1957
  • 51. White-nest swiftlet from Gomantong cave , Sabah
  • 52. Two skins from Juara Bay Tioman island (1907)
  • 53. P. Condore Type locality Malacca Satang Island Mantanani Is. Berhala Is. Maratua Is. (ssp. perplexus ) Southern and western limits of Grey-rumped swiftlets Aerodramus germani in Malaysia P. Tioman Gomantong Sembilan Is
  • 54. Batu Putih, Kepulauan Sembilan Photo: Lim Tze Tshen
  • 55.  
  • 56. “ White Rock” (Sembilan Is.) Eleven nests of Grey-rumped swiftlet on 7/4/2010
  • 57. SWIFTLETS (COLLOCALIINI) of MALAYSIA RESEARCH OPPORTUNITIES 2010 1. Conservation issues Photo: Lim Chan Koon
  • 58. Karst limestone of interior Borneo Surprisingly, no records of Aerodramus swiftlets in any cave in Msia Semenanjung Caves in limestone and other rocks are the natural nesting sites of swiftlets.
  • 59. White cliffs Dizzy heights Twisty tunnels The work of nest collectors is very hazardous
  • 60. A. (f.) vestitus Salai cave, Baram, Sarawak Rarely can nests be gathered by hand Lim Chan Koon
  • 61. Walkways in cave interiors are made of natural materials Panguma cave, Niah, Sarawak Black-nest colony
  • 62. Nuar at Panguma Fixed climbing aids also use available natural materials
  • 63. Johari Top of the pole Sarawak Museum
  • 64. Collecting head at the end of the pole (penyulok ) Huge loss of life – eggs and young birds : Kayan river, Kalimantan Timur George Nawan
  • 65. SWIFTLETS (COLLOCALIINI) of MALAYSIA RESEARCH OPPORTUNITIES 2010 1. Identity of house farmed white-nest swiftlets Photo: Lim Chan Koon
  • 66. House-farm buildings are now a familiar part of the street scene Is this the solution to sustainbility ?
  • 67. HOUSE-FARMING THE LATEST DOMESTICATION Intensive management of housed swiftlets began in Java, Indonesia, in the 1970s
  • 68.
  • 69. In Java, especially, skills developed in transforming buildings naturally colonised by glossy swiftlets into white-nest houses
  • 72. House in transition C. linchi > A. fuciphagus Glossy swiftlet nests White nests
  • 73. New nest house at Bayang Kara, Kaltim. Original wooden house with C. esculenta nests enclosed in concrete shell; eggs imported from W. Java Ventilation holes Cladding, for coolness Javanese technology exported
  • 74. Spontaneous occupation of buildings by edible/white-nest swiftlets Penang & Butterworth Kuala Terengganu Bintulu Melaka Singapore Java (multiple instances) Banjermasin Since 1890
  • 75. Spontaneous colonisations of buildings in Pen. Malaysia Penang (1947) K. Terengganu (1974) Kuala Lumpur (1948) Known start dates Melaka (1953) Singapore (1935)
  • 76.
  • 77. Since 1990s swiftlet-farming has relied on the direct attraction of free-flying birds into specially constructed houses
  • 78. Tower block North Sumatra New build (2002)
  • 79. Vertiginous new structure in Pak Phanang, S. Thailand
  • 80. A young bird at Miri, Sarawak Resembles neither of the wild species of Borneo
  • 81. An adult from Kuching house
  • 82. House-farmed white-nest swiftlets of Sarawak do not resemble either of the wild species Aerodramus germani on islands Aerodramus (f.) vestitus of inland caves
  • 83.
  • 84.
  • 85.
  • 86. Pak Phanang S. Thailand
  • 87. A bird that flew into a house in Taiping Presumably from a local farm-house
  • 88. Adult bird no. 2, Penang 29 Oct 08
  • 89. Adult bird no. 3, Penang 29 Oct 08
  • 90. Adult bird Kota Bahru Oct 08
  • 91.
  • 92. Neighbour Joining Tree based on partial Cyt b region Sibu (03) Setiawan (SW102) Setiawan (SW01) Setiawan (SW101) Kuantan (KT152) Endau (EN191) Endau (EN193) Rompin (RP61) Selangor (SB32B) Selangor (SB32A) Sumatra ( SM77) Sumatra (SM78) Sumatra (SM77a) Sumatra (SM76) vestitus Goh Wei Lim Baram (LS01) Baram (LS09 ) Kuantan (KT41B ) Setiawan (SW02) Kuantan (KT41A) Kuantan (KT151) Endau (EN192 ) A. maximus 66 95 83 49 59 0.005
  • 93.
  • 94.
  • 95. Even the most successful house-farm managers are ignorant of basic biology of swiftlets
  • 96. Malaysian swiftlets: statistics for wild birds (averages ) Species Ad. Wt. (g) Egg size (mm) Clutch Incub’n (days) Fledge (days) Black-nest 18 25 x 16 1 28 59 White-nest ( vestitus) 12.5 20 x 14 2 25 45 Mossy- nest 12.5 21 x 14 2 23 48 Glossy ( cyanoptila ) 7.5 17 x 11 2 22 42
  • 97. Black-nest swiftlet: Slow nestling growth Body mass (g) Wing length (mm) Adult Kang et al.
  • 98. White-nest swiftlet: eggs & nestlings Salai cave, Sarawak, 1997-98 1997 1998 Eggs Nestlings Lim Chan Koon
  • 99. White-nest Swiftlets: % undisturbed, marked nests containing at least one egg = breeding. 3 Sarawak caves Lim Chan Koon
  • 100.
  • 101. Inactive gland Active gland Black nest swiftlet
  • 102.
  • 103. Commercial nests “ C. brevisrostris” Apus pacificus Apus affinis Human growth hormone
  • 104. Repackaged as a novel product
  • 105. The Malaysian government has recognised that the husbandry of swiftlets in houses falls into the remit of the Veterinary Department, including issues such as animal welfare and cruelty
  • 106.
  • 107. Breeding cycle & salivary gland activity Females Males Gonads active Salivary glands inactive Gonads inactive Salivary glands active
  • 108. White-nest : coordinated breeding Lim Chan Koon
  • 109. A. (f.) vestitus : ‘Porcupine’ stage
  • 110.
  • 111.
  • 112. Malaysia (2-5 o N) Annual breeding cycle and moult All birds
  • 113. Black-nest swiftlet at Niah Annual moult of the primary tract
  • 114. A. (f.) vestitus : breeding & moult *** 1 st primaries moulted Last primaries moulted *** Lim Chan Koon
  • 115. Black-nest swiftlets at Sarang: moult & breeding % nests with eggs Count of shed feathers Lim Chan Koon
  • 116.
  • 117. 1958 sonograph of echo-locating calls of Aerodramus maximus < - - - 2 seconds - - - > Single clicks, very short duration : 0 – 15 kHz ‘white sound’ A||||||||||||||V 20 kHz
  • 118.  
  • 119. Why do swiftlets prefer to build their nests in corners ?
  • 120. Corner nests are 3 rd -grade in the market, which prefers 180º nests
  • 121. Studies of behaviour at the cave mouth shows that swiftlets feed only during daylight hours, and that weather (especially rain) is an important determinant of the birds’ activity. It is likely that prolonged rainy weather is detrimental to their ability to feed
  • 122. The influence of weather on behaviour
  • 123. Analysis of food balls fed to nestlings, compared with passive samples of aerial insects, shows that swiftlets are selective feeders, taking a very wide variety of arthropod prey
  • 124.  
  • 125. Could managed, selective breeding of house-farmed birds improve the stock, e.g., female fecundity, nest weight or quality, disease resistance ?
  • 126.
  • 127. In the scenario of this newest domestication, with the backing of sound husbandry and good science , rational planning can ensure the perpetuation and sustainable management of this important biological resource.
  • 128.  
  • 129.
  • 130. Carpometacarpus of a swiftlet Scale in mm Chris Stimpson
  • 131. Carpometacarpus: Fossils from Niah cave Scale in mm Chris Stimpson
  • 132. Carpometacarpus: Fossils from Niah cave Scale in mm Chris Stimpson
  • 133. Gathorne Hardy MA PhD PNBS(K) (5 th Earl of Cranbrook) Sarawak Museum (1956 - Yayasan Siswa Lokantara Universiti Malaya Niah cave excavations “Expeditions” (1964 – 92), to Kinabalu, Gn Benom, Vanuatu, Gn Mulu, Belalong (Brunei) Chairman, English Nature (1990-98), Chairman Entrust, Regulator of Environmental bodies under UK Landfill tax regulations (1996)