Allard Blom - Academia.edu (original) (raw)

Papers by Allard Blom

Regional action plan for chimpanzees and gorillas in west equatorial Africa

Oryx, 1992

This paper examines the current status and distribution of primates in Gabon on the basis of data... more This paper examines the current status and distribution of primates in Gabon on the basis of data collected in the field between 1985 and 1988. There are at least 19 and possibly 21 species of primates definitely present in Gabon, making it one of the richest countries in the world for primates. Most of the species are still widespread and one, the sun-tailed guenon, is endemic. Hunting and habitat destruction are the main threats to the country's primates. The major problem at the moment is the opening up of previously inaccessible areas by logging companies and the Trans Gabon railway, which leads to an increase in hunting pressure. Several species are threatened; the mandrill/drill, the black colobus, and the sun-tailed guenon need special conservation measures. Suggestions for action are made and several new reserves have recently been proposed.

La terminologie géographique employée dans cet ouvrage, de même que sa présentation, ne sont en a... more La terminologie géographique employée dans cet ouvrage, de même que sa présentation, ne sont en aucune manière l'expression d'une opinion quelconque de la part de l'UICN ou d'autres organisations participantes sur le statut juridique ou l'autorité de quelque pays, territoire ou région que ce soit, ou sur la délimitation de ses frontières. Les opinions exprimées dans cette publication ne reflètent pas nécessairement celles de l'UICN.

This action plan represents a consensus of the world's leading experts on the priority areas... more This action plan represents a consensus of the world's leading experts on the priority areas and priority actions needed for preserving wild chimpanzee and gorilla populations in western equatorial Africa. The results were generated at a workshop held in Brazzaville, Republic of Congo ...

Dans certaines régions, les populations de grands singes ont diminué de plus de 50% ces vingt der... more Dans certaines régions, les populations de grands singes ont diminué de plus de 50% ces vingt dernières années. Survie Espoir La mise en oeuvre des recommandations de ce plan peut avoir un impact décisif sur la survie des grands singes de la région. Plan d'action régional pour la conservation des chimpanzés et des gorilles en Afrique Centrale Les experts les plus qualifi és au niveau mondial s'accordent à dire que les investissements et les actions décrits dans ce plan constituent la meilleure stratégie pour la préservation des populations de gorilles et de chimpanzés en Afrique Centrale. Les deux sous-espèces de grands singes en Afrique Centrale: le chimpanzé d'Afrique Centrale Pan troglodytes troglodytes et le gorille de plaine de l'Ouest Gorilla gorilla gorilla Chimpanzé d'Afrique centrale (Pan troglodytes troglodytes) Gorille de plaine de l'Ouest (Gorilla gorilla gorilla) une femelle adulte à gauche et un mâle adulte à droite adult male Plan d'action ...

Regional perspectives and situation regarding elephant conservation and the ivory trade. Background documents

Perspectives régionales et situation de la conservation de l'éléphant et le commerce de l'ivoire. Documents de base

Acta Theriologica, 1990

In order to know the reproductive and social status of fallow deer Dama dama (Linnaeus, 1758) pop... more In order to know the reproductive and social status of fallow deer Dama dama (Linnaeus, 1758) populations at Doñana National Park and analyze the influence of climatic factors and population density on the reproductive performance of females and males, periodic counts were

Biological Conservation, 2004

The Central African Republic (CAR) has made an impressive commitment to biodiversity conservation... more The Central African Republic (CAR) has made an impressive commitment to biodiversity conservation, with a total of 15 protected areas covering about 10.9% of the country. This study critically examines the status of these protected areas in light of their potential for long-term protection of biodiversity. First of all, the protected area system does not protect a representative sample of the ecoregions of the CAR. Even more important is the fact that only 32% of the protected areas are adequately managed. Law-enforcement is inadequate, and poaching poses the largest threat to biodiversity conservation. Given the dim economic prospects, the CAR will need continued financial as well as technical assistance to deal with protected area management. Experiences have shown that such intervention can make a difference. However more attention needs to be given to capacity building, long-term funding mechanisms, regional collaboration and political commitment to make such interventions sustainable in the long-term.

Ecological and economic impacts of gorilla-based tourism in Dzanga-Sangha, Central African Republic

This thesis investigates the potential role of tourism in the funding of protected area managemen... more This thesis investigates the potential role of tourism in the funding of protected area management in the Congo Basin. ... Abstract. This thesis investigates the potential role oftourism in the funding of protected area management in the Congo Basin. ...

African Journal of Ecology, 2004

The Weinberg theorem for the pion-pion scattering is proved analytically in full detail for quark... more The Weinberg theorem for the pion-pion scattering is proved analytically in full detail for quark models in the ladder truncation. The proof is displayed with Feynman diagrams. The axial and vector Ward identities, for the quark propagator and for the ladder, exactly cancel any model dependence. Off mass shell and finite size effects are included in the quark-antiquark pion Bethe Salpeter vertices. This is applied to compute the isospin 0, 1 and 2 scattering matrices off the mass shell .

African Journal of Ecology, 2001

A survey of apes was carried out between October 1996 and May 1997 in the Dzanga sector of the Dz... more A survey of apes was carried out between October 1996 and May 1997 in the Dzanga sector of the Dzanga-Ndoki National Park, Central African Republic (CAR), to estimate gorilla (Gorilla gorilla gorilla) and chimpanzee (Pan troglodytes) densities. The density estimates were based on nest counts. The strip transect census and the line transect survey method (Standing Crop Nest Count) were used to estimate the gorilla nest group density. The strip transect has been most commonly used to date. It assumes that all nest groups within the width of the strip are detected, but as this assumption is easily violated in the dense tropical rain forest, the line transect survey was also used. In this method, only the nest groups on the transect line itself should be detected. This method proved to be an adequate and easy technique for estimating animal densities in dense vegetation. The gorilla density of 1.6 individuals km À2 (line transect survey method) found for the Dzanga sector is one of the highest densities ever reported in the literature for the Western lowland gorilla. The density estimate for chimpanzees was 0.16 individuals km À2 (census method). The results of this study con¢rm the importance of the Dzanga-Ndoki National Park for primate conservation.

Man determines the distribution of elephants in the rain forests of northeastern Gabon

African Journal of Ecology, 1991

On a évalué l'abondance des éléphants en comptant les excréments, dans les forêts reculé... more On a évalué l'abondance des éléphants en comptant les excréments, dans les forêts reculées du nord-est du Gabon, là où il n'y a que peu de gens et aucun abattage d'arbres. Les éléphants préférent les forêts secondaires qui poussent dans les villages et les plantations ...

Behavioural responses of gorillas to habituation in the Dzanga-Ndoki National Park, Central African Republic

The WWF Dzanga-Sangha Project (DS) has been operating in southwestern Central African Republic (C... more The WWF Dzanga-Sangha Project (DS) has been operating in southwestern Central African Republic (CAR) since 1988. Although it was initiated with an emphasis on anti-poaching, the project has evolved into a “model” Integrated Conservation and Development Project (ICDP). The DS project includes programs for wildlife protection, tourism development, research, education, and rural development in its goal to develop, protect, and manage the DzangaSangha Dense Forest Special Reserve and the Dzanga-Ndoki National Park. This paper addresses a key question: Is the ICDP approach the right one, or would a traditional conservation approach be at least as effective? ICDPs find themselves situated between traditional protectionist approaches with complete exclusion from resources and more development-oriented approaches where local people are expected to manage their own resources sustainably. The DS project has faced numerous difficulties in achieving its goals, including population increase, dia...

A survey of the diurnal primates in the Dzanga-Ndoki National Park, Central African Republic

This action plan represents a consensus of the world’s leading experts on the priority areas and ... more This action plan represents a consensus of the world’s leading experts on the priority areas and priority actions needed for preserving wild chimpanzee and gorilla populations in western equatorial Africa. The results were generated at a workshop held in Brazzaville, Republic of Congo in May 2005 with over 70 participants representing range-state governments, national and international conservation organizations, research institutions and funding agencies. Workshop participants agreed that by far the most serious short-term threats to apes in this region are poaching and disease epidemics. In the longer term, however, workshop participants believed that habitat loss and disturbance will become as serious a threat as hunting and disease. Experts agreed upon a list of 12 priority areas (seven exceptional areas and fi ve important areas), as well as two areas that are priorities for surveys. These areas sum to a total of over 150,000 km. Experts also identifi ed knowledge gaps includin...

Estimating forest elephant numbers with dung counts and a geographic information system

The Journal of wildlife …, 1997

RFW BARNES, Department of Biology 0116, University of California San Diego, La Jolla, CA 92093-01... more RFW BARNES, Department of Biology 0116, University of California San Diego, La Jolla, CA 92093-0116 and Wildlife ... Conservation Society, 185th Street and Southern Boulevard, Bronx NY 10460-1099, USA K. BEARDSLEY, Division of Environmental Studies University of ...