Showing papers in "Oryx in 1998"

Use and conservation of Cracidae (Aves: Galliformes) in the Peruvian Amazon

Abstract: Four species of the avian family Cracidae were studied in the Pacaya-Samiria National Reserve in north-eastern Peru. These large-bodied birds are an important source of protein for local communities on the periphery of the reserve. An estimated 425 kg of Cracidae biomass were harvested over a 1-year period by three communities. Pipile cumanensis was the most frequently hunted bird, both in terms of individuals hunted and biomass extracted. Mitu tuberosa and Penelope jaquacu also made up a substantial amount of the biomass extracted, but were hunted less frequently. Densities of all species of Cracidae within 5 km of the villages were substantially lower than in the interior of the reserve. Our results suggest that M. tuberosa and P. cumanensis are overharvested and P. jaquacu and Ortalis guttata are harvested within the maximum estimated sustainable levels. In this study hunting grounds were along waterways and adjacent to protected populations, which created a source-sink arrangement. If sink areas are overhunted, the unhunted populations inland of the waterways could be acting as source populations that replenish overhunted areas.

Hornbill abundance in unlogged forest, selectively logged forest and a forest plantation in Arunachal Pradesh, India

Abstract: The responses of hornbills to selective logging were determined by comparing their diversity and abundance in five habitats classified according to logging history. Relative abundance of three hornbill species was compared along trails in recently logged forest, 20‐25-year-old logged forest, unlogged primary forest, a relatively disturbed primary forest and a plantation in Pakhui Wildlife Sanctuary and adjoining reserve forests in western Arunachal Pradesh. The species recorded were the Oriental pied hornbill Anthracoceros albirostris, wreathed hornbill Aceros undulatus and great hornbill Buceros bicornis. The great hornbill was the most common species overall and its abundance varied across habitats, being highest in unlogged forest. The Oriental pied hornbill, which was recorded in only two habitats, seemed to show a distinct habitat preference for secondary growth, rivermargin forests. Wreathed hornbill abundance did not differ between habitats. Differences in species abundance probably reflect aspects of their ecology, such as degree of territoriality, diet and movement patterns, and differential vulnerability to hunting and disturbance. Great hornbill abundance was correlated with large tree density (GBH ³ 150 cm) and basal area characteristic of unlogged primary forests, while Oriental pied hornbill abundance was negatively correlated with tall forest, indicating its greater numbers in low-stature river-margin forest. Wreathed hornbill abundance was not correlated with any vegetation variable, which is probably related to its reported nomadic movements in search of fruit patches. Hornbill abundance was not correlated with densities of potential food and nest tree species. Although hornbill abundance was not correlated with fig tree density, this was probably because areas where relative fig tree densities were lower often contained a few large fruiting figs. Because hornbills are large mobile birds, they can find resources such as fruiting figs even in otherwise unsuitable habitat.

Social change and conservation misrepresentation in Africa

Abstract: Concomitant with the increasing denouncement of African game legislation as inappropriate law imposed by a former colonial authority, is the attack upon traditional, i.e. total protection, practice of conservation. It is increasingly argued by a school of neo-populist thinkers, that local people should be allowed to exploit protected areas in accordance with their own traditions and beliefs. Examples of alleged injustice or practice are consistently misrepresented with a view to replacing traditional conservation practice with left-wing political dogma, proponents claiming a mandate from the Caracas 1992 IVth World Congress on National Parks and Protected Areas.

Ten years of Arabian oryx conservation breeding in Saudi Arabia – achievements and regional perspectives

Abstract: The National Commission for Wildlife Conservation and Development was established in 1986 to oversee all wildlife conservation programmes in Saudi Arabia. The Arabian oryx Oryx leucoryx is one of the flagship species of the Saudi Arabian reintroduction policy. It has been captive-bred since 1986 at the National Wildlife Research Center near Taif. With the creation of a network of protected areas in the former distribution range of the species, attention has shifted to the release of captive-bred oryx into Mahazat as-Sayd and 'Uruq Bani Ma'arid reserves. Similar programmes carried out in other countries of the Arabian Peninsula underline the need for regional co-operation and pan-Arabic public awareness programmes, in addition to captive-breeding and reintroduction projects.

A faunal survey of the Dieng Mountains, Central Java, Indonesia: distribution and conservation of endemic primate taxa

Abstract: A faunal survey was conducted in May–September 1994 and June–July 1995 in the Dieng Mountains, one of the last remaining larger patches of forest in Central Java province, Indonesia. All three primate species endemic to the Javan faunal region – Javan gibbon Hylobates moloch, grizzled leaf monkey Presbytis comata and ebony leaf monkey Trachypithecus auratus– were found to be present. Hylobates moloch occurs only in the lowland and hill forests in the western part of the study area, while the other two species were found throughout the area from lowland to montane forests. Although more research needs to be done on habitat preferences and densities at which the primates occur, the available data suggest that the Dieng Mountains may harbour the second largest populations of both H. moloch and P. comata in the same location. In order to safeguard these two endangered primates it is suggested that the reserve system in Java be expanded to include the Dieng Mountains.

Wildlife snaring – an indicator of community response to a community-based conservation project

Abstract: The use of wire snares for catching wildlife to support household needs was treated as an indicator to evaluate community support and understanding for a community-based resource management project. Data were based on snare counts in areas surrounding the targeted community as well as from interviews with individuals purported to have had a history of snaring. The high use of snares conflicted with expected behaviour for a community benefiting from the project. Snaring levels were high enough to threaten the viability of the safari industry and the derived revenues that were meant to be shared with the community. These contradictions suggested flaws in the project: an overdependence on external donor-supported management and lack of real community involvement and leadership in management of the resource. This study underscores the critical importance for monitoring land-use behaviour as an indicator of the success of community-based management projects.

Distribution, abundance and conservation status of Grauer's gorilla

Abstract: This report updates the distribution and provides abundance estimates for Grauer’s gorilla Gorilla gorilla graueri across its 90,000-sq-km range. The authors divide the range of Grauer’s gorilla into four regions within which they identify 11 populations and estimate a total of c. 16,900 individuals. Gorillas found in the Kahuzi-Biega lowland‐Kasese region represent 86 per cent of the subspecies’s total population. Further, approximately 67 per cent of known Grauer’s gorillas inhabit Kahuzi-Biega, Maiko and Virunga National Parks. The eastern region of the Democratic Republic of Congo (formerly Zaire) has an extremely high human population growth rate indicating that deforestation and wildlife use trends will continue to increase. Thus, in spite of the encouraging results of surveys to identify populations and characterize abundance, no Grauer’s gorilla population should be considered safe from extirpation.

Squirrel monkeys in Costa Rica: drifting to extinction

Abstract: Central American squirrel monkeys Saimiri oerstedii are limited to Costa Rica and Panama, and have never been abundant. The Costa Rican population is now decimated. Based on our survey of squirrel monkeys throughout a large portion of the Costa Rican range of this species in 1996, we can confirm that at least 1246 squirrel monkeys remain in 26 spatially dispersed localities. Despite probable undercounts of squirrel monkeys within sites and potentially missed localities, the total population size should be considered far below a size that would provide long-term genetic viability. Deforestation and habitat fragmentation spurred by agricultural and tourism development are the familiar culprits contributing to this decline. Our strong recommendation is that future conservation efforts be targeted at the level of each specific locality, perhaps recruiting local, national and international sponsors. A focused strategy would allow management efforts to be tailored to the circumstances specific to each site and thus allocate scarce resources more efficiently.

The distribution, abundance and population trends of gentoo, rockhopper and king penguins in the Falkland Islands

Abstract: The Falkland Islands are a globally important breeding location for seabirds, including penguins. The total breeding populations of three of the four main penguin species present in the Falklands were censused in the austral summer of 1995/96. The results for gentoo and rockhopper penguins suggest declines of about 43 and 90 per cent, respectively, since a similar census in 1932/33. Recent monitoring studies suggest that these declines are still continuing; research to investigate causes (which is likely to reflect changes in the marine, rather than terrestrial environment) is a high priority. In contrast, king penguin populations, currently c. 400 pairs, have increased steadily, by 700 per cent since 1980/81, in line with world-wide trends for this species.

Status of selected mammal species in North Myanmar

Abstract: During 1996 and 1997, data on the status of selected mammal species were collected from a remote region of North Myanmar. Of the 21 species discussed in this paper, the black muntjac, stone marten and blue sheep are new records for the country. One species, the leaf muntjac, has never been described. At least three species that once inhabited the region – elephant, gaur and Sumatran rhinoceros – are no longer present, and the tiger has been nearly extirpated. Himalayan species that are declining elsewhere, such as takin, red goral and red panda, are still relatively abundant despite hunting pressures. Musk deer are in serious decline. The wolf, while not positively confirmed, may be an occasional inhabitant of North Myanmar.

Tracking the movements of translocated elephants in Malaysia using satellite telemetry

Abstract: Malaysia incurs damage worth millions of dollars annually from elephants feeding in plantations. In response, the Malaysian Wildlife Department has translocated over 392 elephants from plantations into protected areas since 1974. Dense rain forest and steep terrain at the release sites have made it near impossible to follow the movements of the released elephants and evaluate the success of the programme. In October 1995, a translocated female elephant was fitted with a satellite transmitter to determine its post-release movements. By August 1996, the female had moved within a range of 7000 sq km. The movements were erratic initially and covered a large area. They were followed by a shift in location twice, each time covering successively smaller areas. Attempts to locate and follow the female on the ground revealed no evidence that she travelled in a group. A second, male, elephant was equipped with a satellite transmitter in February 1996 and by August 1996, it had moved within a range of 350 sq km. An attempt to locate and follow the male on the ground provided evidence that he was in a group of at least three individuals. The difference in the behaviour of the two elephants, released at exactly the same location, is striking, but additional elephants need to be followed to increase sample size and allow a scientific explanation of the findings.

Managing bushmeat hunting in Okapi Wildlife Reserve, Democratic Republic of Congo

Abstract: Projected rates of agricultural clearing in the Ituri Forest of north-eastern Democratic Republic of Congo range from 0 to 0.1 per cent per year and suggest that deforestation for subsistence agriculture is not an immediate threat to the integrity of the Okapi Wildlife Reserve (OWR). If the human population continues to grow at over 3 per cent per annum, and bushmeat continues to be a major source of income for rural communities, subsistence-level exploitation of bushmeat may, however, not be sustainable. This paper proposes management approaches that address the demand for and supply of bushmeat, which are targeted at those political districts within the OWR where hunting is the greatest threat to populations of bushmeat species. These management approaches are designed to help conserve the Ituri's natural resources without compromising the health and income security of rural communities.

Three monkeys nearing extinction in the forest reserves of eastern Côte d'lvoire

Abstract: Surveys were carried out in forest reserves in eastern Cote d'lvoire in 1997 to investigate the status of three primate taxa believed to be on the verge of extinction. The findings indicate that Procolobus badius waldroni may be extinct, and that Cercopithecus diana roloway and Cercocebus atys lunulatus may become so unless urgent action is taken .

Translocation and introduction of the Zanzibar red colobus monkey: success and failure with an endangered island endemic

Abstract: The Zanzibar red colobus Procolobus kirkii is one of Africa's most endangered primates, with only c. 1500–2000 individuals remaining in the wild. The authors made preliminary surveys of three areas where this monkey was translocated or introduced in the 1970s and 1980s. It appears that only one of these releases was successful. A total of 67 animals were caught and translocated or introduced (including four that died during the process). Thirteen to 20 years later, 62–70 red colobus were located at the three sites; i.e. there had been no net gain in colobus numbers as a result of the translocations and introduction. One attempt apparently failed because of insufficient habitat, and another perhaps because of insufficient numbers of colobus or an imbalance in the age and sex composition of animals released. The one successful translocation involved moving a fairly large number of monkeys (36) into a forest with a relatively high diversity of tree species. In light of these findings, the authors recommend that far more attention be given to protecting the monkeys and their habitat where they currently exist, rather than spend time and money on translocations that are as likely to fail as to succeed.

Status of the Indus River dolphin Platanista minor

Abstract: The endemic freshwater dolphins in the Indus River system of Pakistan, Platanista minor, have been considered endangered since the early 1970s. Measures taken to protect them from deliberate capture seem to have stopped a rapid decline, and combined counts in Sindh and Punjab provinces since the early 1980s suggest a total population of at least a few hundred animals. Severe problems remain, however. In addition to the risks inherent to any species with an effective population size in the low hundreds (at most), these dolphins are subject to long-term threats associated with living in an artificially controlled waterway used intensively by humans. Irrigation barrages partition the aggregate population into discrete subpopulations for much of the year. Dolphins that ‘escape’ during the flood season into irrigation canals or into reaches downstream of barrages where winter water levels are low have little chance of survival. A few dolphins probably die each year after being caught in fishing nets. Pollution by untreated urban sewage, agricultural runoff and industrial effluent threatens the health of the entire Indus system. The future of this dolphin species depends on Pakistan's commitment to protecting biological diversity in the face of escalating human demands on dwindling resources.

Status and conservation of the giant muntjac Megamuntiacus vuquangensis, and notes on other muntjac species in Laos

Abstract: The large-antlered, or giant, muntjac Megamuntiacus vuquangensis was described from Vietnam in 1994 and found concurrently in the Annamite Mountains and nearby hill ranges of central and southern Laos. The northerly and southerly range limits are still unknown. It may occupy a wide range of habitats and is found sympatrically with the common muntjac Muntiacus muntjak. Another muntjac species, the taxonomic affinity of which is as yet undetermined, was recently discovered to occur within its range. The large-antlered muntjac is probably not threatened with extinction in the near future, but in view of its restricted range and threats from habitat degradation and hunting, it should be classified as Vulnerable in the Red Data Book. Its future in Laos is largely dependent on the recently created protected-areas system to maintain large tracts of habitat and reduce hunting pressure.

Circumstantial evidence for the presence of monk seals in the West Indies

Abstract: Based on interviews with 93 fishermen in northern Haiti and Jamaica during 1997 an assessment was made of the likelihood that monk seals survive in this region of the West Indies. Fishermen were asked to select marine species known to them from randomly arranged pictures: 22.6 per cent (n = 21) selected monk seals. This number was significantly (P 0.1) from the number who selected manatees, which are known to occur in the region in small numbers. More than 95 per cent of respondents also identified species that are known to occur commonly in the region. Further questioning of the 21 respondents who selected monk seals suggested that 16 (78 per cent) of them had seen at least one in the past 1–2 years. Those fishermen that were able to provide further descriptions gave information about size and colour that was consistent with many of these seals being monk seals. It is possible that the Caribbean monk seal is not extinct.

An overlooked population of the beira antelope Dorcatragus megalotis in Djibouti

Abstract: The beira antelope Dorcatragus megalotis, which is listed as possibly extinct in Djibouti in the 1996 IUCN Red List, was observed there by the authors in 1993/94. The authors discuss its status in the country and the action needed for its conservation.

Surveys on Propithecus verreauxi deckeni, a melanistic variant, and P. v. coronatus in north‐west Madagascar

Abstract: Propithecus verreauxi is currently divided into three or four subspecies. Decken's sifaka, P. v. deckeni, and the crowned sifaka, P. v. coronatus, are believed to be synonymous by some authors, while others regard them as separate subspecies. The results of a survey on an isolated melanistic population of Decken's sifaka, known from museum specimens collected in Ambararatabe, as well as the results of additional surveys carried out within the ranges of P. v. deckeni and P. v. coronatus are presented. A detailed description and photographs of the melanistic variant are provided. The data are employed to argue the case for recognition of the subspecific status of the endangered P. v. coronatus. The consistency of sightings of P. v. coronatus to the east of the river Mahavavy and to the west of the river Betsiboka, and sightings of P. v. deckeni to the west of the Mahavavy indicate clear separation of the two subspecies in the lower reaches of the two rivers. Clarification of the status of the enigmatic museum specimens from Ambararatabe, representing a melanistic form rather than hybridization of P. v. deckeni and P. v. coronatus, lends further support to this argument.

The black lion tamarin Leontopithecus chrysopygus – its conservation and management

Abstract: The black lion tamarin Leontopithecus chrysopygus originally occurred throughout a large part of the Atlantic forest in the west of the state of Sao Paulo, Brazil. Today, however, it is restricted to a few isolated forest fragments as a result of deforestation caused by cattle ranching, and urban and agricultural expansion, especially in this century. One of its last strongholds is a small gallery forest at Lencois Paulista in the west-central part of the state. The authors report on a long-term study of this small and isolated population, aimed particularly at providing a basis for the intensive management and conservation of the species and its habitat.

Mammals, birds and reptiles of Dibru‐Saikhowa Sanctuary, Assam, India

Abstract: Dibru-Saikhowa Sanctuary protects 340 sq km of the floodplains of the Brahmaputra and Lohit rivers in eastern Assam state, north-eastern India. It provides habitat for several threatened species, including Asian elephant and tiger. The sanctuary suffers from several problems, however, including illegal tree felling, the scarcity of safe, high ground for animals during the annual floods and insufficient staff and resources. The author makes recommendations for improving the conservation value of the sanctuary.

Ivory in Kathmandu

Abstract: Elephant ivory is still on sale in Kathmandu, in Nepal, despite the fact that this transgresses the country's legislation. In a recent survey of 184 shops frequented by tourists 1454 ivory items were found for sale. Trade in ivory is at a vey low level, but dealers are still importing ivory. The Forest officers and police need to be motivated to confiscate the ivory and take the offenders to court. Without fully implementing Nepal's 25-year-old National Parks and Wildlife Conservation Act, the authorities are indirectly encouraging people to flout the restrictions.