Consultant's Report of Biodiversity Specialist for Usaid Pid Mission Natural Resources Management in Kalimantan
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CONSULTANT'S REPORT OF BIODIVERSITY SPECIALIST FOR USAID PID MISSION NATURAL_ RESOURCES MANAGEMENT IN KALIMANTAN Kathy MacKinnon Ecology Advisor EMDI D~cember 1988 The Biological Importance of Kalimantan Kalimantan, as part of the great·island of·Borneo,theworld's~· third-largest island, is biologically. one of· themost.important-· , ..... -. - --r- areas of Indonesia. Borneo lies within the everwet tropiCS and supports the largest expanse of tropical.~rainforest -in ~the - ~ Indomalayan Realm. It is a main centre of distribution for many genera of the Malesian flora and the Indomalayan fauna. Forest types include mangrove forests, large areas of peat swamp and freshwater non-peaty swamp, the most extensive heath or kerangasforests in the realm, lowland dipterocarp forest, forests on limestone, and variolls montane formations. Geologically and climatically, Borneo has remained stable for the last few thousand years and evolved high species diversity. Table 1 compares species richness and endemism for plants, mammals, birds and reptiles on the Indonesian islands. Borneo and Irian Jaya (New Guinea) score most highly for spedes richness and are the obvious fir.st can:iidates for conservation efforts to protect biological divE:rsi ty in Indonesia. Deforestation and development are proceeding more rapidly in Kalimantan. Kalimantan's need for immediate action makes it the best focus for the USAID natural resources managemElDt project to maintain biological d.iversity. Borneo is very rich in both flora and fauna. Tne illlanJ is the richest unit of the Sundaic subn~gion ",'itn :;mall plot t::-ee diversity as high as fot.::.:lj anywhnre in ~ew (,u1nea or S:ilth America. Borneo, j,'"ith 262 SpeciE!3 of riipteroca=;:s, 1:; i:he centre of distribution :o!' the f,:,.rcily D:!pteroce::-paceae. ~ __ e most impo::-tant g::-oup of cm!t:l!e=:::..~a:' t:'t:::::ers in Sc·::t.h- 1";",1: A:::' =.. Endemism runs at high levels t:nr('ughc.'Ut the wao~.e fl(o,:,,~: .,-ith about 34% of all plant species and 59 genera unique t.o the island. On comparison, Sumatra has only 12% endemism cit species level and 17 endemic genera). Borneo also has 30 species of endemic birds and 44 endemic land mammals, mlln, of them montane species. , Within l!orneo it is possible to recognise several distinct biogeographic un~ts. Several of the !:1ajor rivers have ~icted c.S barriers to faunal distribution. Ine Routhwest part c: the island between the Kapuas and Barito rivers hall a different: gibbon species (Hylobates agilis) to that found over. th: rest of the island (;Bylobates muel+eri). Tne south-Ioles tal so lacks the bandt~d leaf monkey Presbyt1,s melalophos anc :i s generally faunally and florally impoverished compared to othE:r parts of BO'':1J.eo. The area to the east of the Bnrito mlc south of the Mahakam is another distinct Ullit, from which th.? orangutan Pongo pygmaeus is abseIlt: and with a centre of - 2 - floral distinctiveness centred on the Meratus mountains. The east coast of Borneo is somewhatdistirict because it is' seasonally drier than the rest of. the island._--The.. north is ---... florally and faunally much richer in species than the south, with elephants Elepbas maximus and several rodents not found in the south. Four distinct centres of plant endemism can be recognised - the north-east corner (tallest-and- richest-forests in Borneo), north coast, north-west, and the central hills and mountain ranges (including Mt. Kinabalu, Sabah, at 4101 m the highest peak in South-East Asia, as well as the highest Kalimantan ranges). This central biogeographic unit contains the distinct montane flora and.fauna of the island, with 23 endemic birds and 21 endemic mammals. Spec:ies of Special. Conservation Concern Bornean mammal species listed in the IUCN Red Data Book include: cloudE~d leopard Nf.~ofEdis nebulosa, bay cat Felis badia (very rare), marbled cat Felis mal"mol"ata, flat-headed- cat Felis planiceps, proboscis monkey -NB_2~lalrs larvatus~ Bornean tarsier Tarsius bancanus (probably fairly common in lowland forests though rarely seen), orangutan Pongo pygmaeus (seriously threatened by the destruct:!.on of its forE~st habitat!"), elephant Elephss maximus ( a small population in Saban which may sometimef' w_:inder into thf.~ Ulu Sembakung area in northern E. Kalj_ltan~an), S'.lnat-=an rll!--::lO I'icerorhinus sumat.ranus (ext:nc:t over ::::..l-!!: o~ 50:-::-=0 with relict popu~ations in Saba..~, Sa!a;,u.K and possiblJ Kayan-Mez:tarar.g), a::c tJ:lnten~ Bos javanicus. Tne only Ilornean bird list;~(: in :he Bird Red Data Book is the Malay peacock pheasant IJol:rJ>lectl~oIl m. scbleiermacheri, but several other birds are rarE! or threatened including the Great Argus Argusj.anus argus (common but easily snared), helmeted hornbill Rhinoplax ... :lgil (hllnted for .its fE~athers and valuable ivory casque), Buh7er's pheasant Lophura buiweri, swiftlets Collocalia fuc:lpbllgn and C. maxima (locally threatened by overccllectio:t of ediblE~ nests), black··brolo7ed jungle babbler T~ichastoula rer13piciliatum (very rare and threatened by habitat 10I3s), Everett's ground thruflh Zflotbera everetti (rare on a few mountains) ar._d the bald-headl~d woodshrike Pityriasis gYlllllol:ephala (a rare lowland bIrd threatened by habHat l(oss). CrocodilesCrocodylus PQroElt:.s and fa.lse gavialsTomistoma schlegelii have been heavi~lY ov-ercol1ectE!d and are now rare throughout the island. - 3 - One insect group for which critical habitats have been studied is swallowtail butterflies.' Borneo has 40 species of swallowtails, four of them endemic to the island. Three of these endemics probably occur in the Sungai Kayan-Mentarang ~ Reserve (Collins and Morris, 1985). Plotted distributions of resident Indonesian birds (!-lacKinnon ...' and Wind,1980) indicate that all Kalimantan species'will be represented within the existing and proposed reserve system and the same is probably true for mammals, especially the major groups. All Bomean primate species are protected in at least one major Kalimantan reserve (MacKinnon, 19862 - Table 2. It is worth emphasising, however, that while these species are recorded 1n reserves at present, their continued survival there will depend upon effective protection and management. The Sumatran rhino is now extinct~in~Kutai-N .P.,.. a-reser·ve:.·~ originally established to protect this species. Borneo has been identified by the IUCN Threatened Plants Unit as a centre of plant diversity.···As· well as the commercially' important dipterocarp species (such as meranti, Shorea) Borneo is famous for ironwood Eusideroxylon zwageri,'more than 4000 species of orchids, and is the centre of distribution for the remarkable Nepenthes pitcher plants. Many of the tree families provide tropical fruits widely harvested by local peoples 8:ld sometimes cODesticated in home gardens, e.g., mangoss, durians, Baccaurea (Euphorbiaceae), Artocarpus (breae:ruHs and jaclr.fruits), and NepheUum (rambutans). Am(mg the Bo=nean pa3.ms are several genera which produce fruit, foo:' anc. o':ner products widely used hy local communities. Sugarpalms include Arenga pinnata, Nypa fructicans, and Borassodendron bomeens1s. The sago pa].-: }o[etroxylon sago is also harvested for sago. Several rattan palms, Calamus. spp, are commercially valuable and four or f:1ve species are grown in traditional home gardens in East Y-alimantan. Bamboos, ferns alld other plants are widely utilised •. , ~.a.ny of the traditioual Daynk cOIWDunities of Kalimantan live in close contact with the natural environment and utilise natural resourt!es and forest products for food, handicrafts, building materials, medicines, fish poisons, lrrappings and ritual uses. With increasing exposure to modern lifestyles and availability of other alternatives, communities are utilising these plant products less frequently and it is"'important to document this knowledge before it is lost. Treatments for a wide range of illnesses and diseases are still obtained from plant extracts. Some of these may be ineffective, but several are widely believed to be efficacious and some plants (e.g., Pltyogramma, Blechum, Nephrolepls, Urena, Celrodendrum may repay phytochemical and pharmaceutical - 4 - investigation (Pearce et a1., 198]). _ Other plant products with known physiological effects include the root of Derris- elliptica, an insecticideand'fish==-poi'SonrGon1othalamus,'an _'c r_"_~ insect repellent with anti-microbial action, Diospyros, a fish poison, and the poison-preBent~inParartocarpus--latex.---- Current 'Land Use The island of Borneo has seen little volcanic activity. Its soils are old and relatively infertile. As a result, Borneo is less heavily colonised than many of the other Indonesian islands. Human density is only about ]0 people per km2 and over 60% of the land surface was until recently under natural forest. This figure is fast~reducingaslogging continues.--- Kalimantan Timur (Indonesia's second largest --province with an area of 197,110 km2) has a population of only 1.6 million people, mainly distributed in the coastal lowlands, fertile Mahakam valley and upland river valleys. The traditional peoples of Borneo have long practised slash and burn agriculture, an agricul~uraL regime- that--can- be -sustained.-- in relative balance when practised at low densities and with long fallow periods. Even so, in the Kelabit highlands along the Sarawak-Kalimantan border, there are extensive man-created highland grasslands. More seriously, the Bornean forests are being cleared by logging and for human resettlement. Logging bas made a heavy impact on th~ rich lowland dipterocarp forests; about balf of Indonesia's annual timber exports come out of f~limantan. Further forest loss was caused by the I extensive fires that swept through drought-ridden eastern Borneo in 1982/83. Some 3.5 million hectares of forest (an area as large as Belgium and much· already partially lcggE!d) was lost in East Kalimantan and another million hectares in Sabah. Human resettlement schemes as part of the Government's Transmigration programme have also open'ed up new areas of forest, not always on soils suitable for agriculture, and the new settlers have cleared further forest lands by cutting and burning to make ladangs.