Regional Biodiversity Planning and Lemur Conservation with GIS in Western Madagascar
Identifieur interne : 001070 ( Istex/Corpus ); précédent : 001069; suivant : 001071Regional Biodiversity Planning and Lemur Conservation with GIS in Western Madagascar
Auteurs : A. P. Smith ; N. Horning ; D. MooreSource :
- Conservation Biology [ 0888-8892 ] ; 1997-04-20.
Abstract
Primary forest cover in western Madagascar declined from 12.5% in 1950 to 2.8% in 1990. Approximately 23% of remaining forest is located within reserves, but this is no guarantee of protection. Forest cover in the Andranomena Reserve in western Madagascar has been reduced by 44% since 1950. The identification of priority areas for establishment of development projects has been constrained by lack of information on the distribution, abundance, and habitat requirements of threatened species and the size, condition, and threats to survival of forest remnants. We evaluate a rapid fauna survey and habitat modeling procedure specifically designed to generate information for reserve selection and design using Geographical Information Systems (GIS). The study was conducted in the largest remnant (94,000 ha) of primary monsoon rainforest in western Madagascar, using lemurs as an indicator group. Lemur abundance and microhabitat variables were measured at 64 stratified survey sites dispersed throughout the region. These records were incorporated into a GIS with other environmental and landuse data derived from maps and satellite imagery. Statistical procedures were applied to analyze species habitats, predict and map species distributions, and estimate species population sizes throughout the study area. Patterns of slash and burn agriculture and anthropogenic disturbance were also analyzed to identify areas at low risk of cultural disturbance. A map of disturbance risk was overlaid with a map of relative lemur biodiversity to identify conservation priority areas with high biodiversity and low risk of short term disturbance. Lemur diversity was most strongly influenced by habitat clearing and human disturbance (harvesting, stock grazing, and hunting) within 8 km of villages. Lemur diversity was highest in a region of higher elevation and rainfall, distant from villages and roads. The only existing reserve in the study area was located in a region of high disturbance risk. Almost half the reserve has been degraded during the past 45 years. There is considerable scope for re‐allocation of land use within the study area to include a core protected area, a buffer zone with controlled hunting and timber harvesting, and an adjacent ecotourism facility. We found that information generated by a stratified biodiversity and landuse survey at a sampling intensity of less than 0.1% was sufficient to provide an objective foundation for regional biodiversity planning.
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DOI: 10.1046/j.1523-1739.1997.95283.x
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Approximately 23% of remaining forest is located within reserves, but this is no guarantee of protection. Forest cover in the Andranomena Reserve in western Madagascar has been reduced by 44% since 1950. The identification of priority areas for establishment of development projects has been constrained by lack of information on the distribution, abundance, and habitat requirements of threatened species and the size, condition, and threats to survival of forest remnants. We evaluate a rapid fauna survey and habitat modeling procedure specifically designed to generate information for reserve selection and design using Geographical Information Systems (GIS). The study was conducted in the largest remnant (94,000 ha) of primary monsoon rainforest in western Madagascar, using lemurs as an indicator group. Lemur abundance and microhabitat variables were measured at 64 stratified survey sites dispersed throughout the region. These records were incorporated into a GIS with other environmental and landuse data derived from maps and satellite imagery. Statistical procedures were applied to analyze species habitats, predict and map species distributions, and estimate species population sizes throughout the study area. Patterns of slash and burn agriculture and anthropogenic disturbance were also analyzed to identify areas at low risk of cultural disturbance. A map of disturbance risk was overlaid with a map of relative lemur biodiversity to identify conservation priority areas with high biodiversity and low risk of short term disturbance. Lemur diversity was most strongly influenced by habitat clearing and human disturbance (harvesting, stock grazing, and hunting) within 8 km of villages. Lemur diversity was highest in a region of higher elevation and rainfall, distant from villages and roads. The only existing reserve in the study area was located in a region of high disturbance risk. Almost half the reserve has been degraded during the past 45 years. There is considerable scope for re‐allocation of land use within the study area to include a core protected area, a buffer zone with controlled hunting and timber harvesting, and an adjacent ecotourism facility. We found that information generated by a stratified biodiversity and landuse survey at a sampling intensity of less than 0.1% was sufficient to provide an objective foundation for regional biodiversity planning.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>A. P. Smith</name><affiliations><json:string>University of New England, Armidale, NSW 2351 Australia,</json:string></affiliations></json:item><json:item><name>N. Horning</name><affiliations><json:string>STX Corporation, 4400 Forbes Boulevard, Lanham, MD 20706, U.S.A.</json:string></affiliations></json:item><json:item><name>D. 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We evaluate a rapid fauna survey and habitat modeling procedure specifically designed to generate information for reserve selection and design using Geographical Information Systems (GIS). The study was conducted in the largest remnant (94,000 ha) of primary monsoon rainforest in western Madagascar, using lemurs as an indicator group. Lemur abundance and microhabitat variables were measured at 64 stratified survey sites dispersed throughout the region. These records were incorporated into a GIS with other environmental and landuse data derived from maps and satellite imagery. Statistical procedures were applied to analyze species habitats, predict and map species distributions, and estimate species population sizes throughout the study area. Patterns of slash and burn agriculture and anthropogenic disturbance were also analyzed to identify areas at low risk of cultural disturbance. A map of disturbance risk was overlaid with a map of relative lemur biodiversity to identify conservation priority areas with high biodiversity and low risk of short term disturbance. Lemur diversity was most strongly influenced by habitat clearing and human disturbance (harvesting, stock grazing, and hunting) within 8 km of villages. Lemur diversity was highest in a region of higher elevation and rainfall, distant from villages and roads. The only existing reserve in the study area was located in a region of high disturbance risk. Almost half the reserve has been degraded during the past 45 years. There is considerable scope for re‐allocation of land use within the study area to include a core protected area, a buffer zone with controlled hunting and timber harvesting, and an adjacent ecotourism facility. 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P.</forename><surname>Smith</surname></persName><affiliation>University of New England, Armidale, NSW 2351 Australia,</affiliation></author><author xml:id="author-2"><persName><forename type="first">N.</forename><surname>Horning</surname></persName><affiliation>STX Corporation, 4400 Forbes Boulevard, Lanham, MD 20706, U.S.A.</affiliation></author><author xml:id="author-3"><persName><forename type="first">D.</forename><surname>Moore</surname></persName><affiliation>University of New England, Armidale, NSW 2351 Australia,</affiliation></author></analytic><monogr><title level="j">Conservation Biology</title><title level="j" type="abbrev">Conservation Biology</title><idno type="pISSN">0888-8892</idno><idno type="eISSN">1523-1739</idno><idno type="DOI">10.1111/(ISSN)1523-1739</idno><imprint><publisher>Blackwell Science Inc</publisher><pubPlace>Cambridge, MA, USA</pubPlace><date type="published" when="1997-04-20"></date><biblScope unit="volume">11</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="498">498</biblScope><biblScope unit="page" to="512">512</biblScope></imprint></monogr><idno type="istex">DD4A3A15252EEF00A755FFA62CEEB89D118F4C30</idno><idno type="DOI">10.1046/j.1523-1739.1997.95283.x</idno><idno type="ArticleID">COBI95283</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1997</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Primary forest cover in western Madagascar declined from 12.5% in 1950 to 2.8% in 1990. Approximately 23% of remaining forest is located within reserves, but this is no guarantee of protection. Forest cover in the Andranomena Reserve in western Madagascar has been reduced by 44% since 1950. The identification of priority areas for establishment of development projects has been constrained by lack of information on the distribution, abundance, and habitat requirements of threatened species and the size, condition, and threats to survival of forest remnants. We evaluate a rapid fauna survey and habitat modeling procedure specifically designed to generate information for reserve selection and design using Geographical Information Systems (GIS). The study was conducted in the largest remnant (94,000 ha) of primary monsoon rainforest in western Madagascar, using lemurs as an indicator group. Lemur abundance and microhabitat variables were measured at 64 stratified survey sites dispersed throughout the region. These records were incorporated into a GIS with other environmental and landuse data derived from maps and satellite imagery. Statistical procedures were applied to analyze species habitats, predict and map species distributions, and estimate species population sizes throughout the study area. Patterns of slash and burn agriculture and anthropogenic disturbance were also analyzed to identify areas at low risk of cultural disturbance. A map of disturbance risk was overlaid with a map of relative lemur biodiversity to identify conservation priority areas with high biodiversity and low risk of short term disturbance. Lemur diversity was most strongly influenced by habitat clearing and human disturbance (harvesting, stock grazing, and hunting) within 8 km of villages. Lemur diversity was highest in a region of higher elevation and rainfall, distant from villages and roads. The only existing reserve in the study area was located in a region of high disturbance risk. Almost half the reserve has been degraded during the past 45 years. There is considerable scope for re‐allocation of land use within the study area to include a core protected area, a buffer zone with controlled hunting and timber harvesting, and an adjacent ecotourism facility. We found that information generated by a stratified biodiversity and landuse survey at a sampling intensity of less than 0.1% was sufficient to provide an objective foundation for regional biodiversity planning.</p></abstract><abstract xml:lang="es"><p>La cobertura de bosques primarios en el oeste de Madagascar disminuyó de 12.5% en 1950 a 2.8% en 1990. Aproximadamente un 23% del bosque remanente está localizado en reservas, pero esto no garantiza su protección. Las reservas están sujetas a caza, recolección, pastoreo y actividades de agricultura con tumba y quema. La cobertura de la reserva de Andranomena en Madagascar ha sido reducida en un 44% desde 1950. En vista de esta amenaza, los bosques tropicales estacionales deciduos de monson del oeste de Madagascar pueden ser considerados entre los ecosistemas más amenazados del planeta. La identificación de áreas prioritarias para el establecimiento de Proyectos Integrales de Conservación y Desarrolla (PICD) ha sido restringida debido a la falta de información sobre la distribución, abundancia y requerimientos de hábitat de las especies amenazadas, además del tamaño, condición y amenazas para la supervivencia del bosque remanente. Evaluamos un muestreo rápido de la fauna y procedimientos de modelado de hábitat diseñados específicamente para generar información para la selección de reservas y su diseño, mediante el uso de Sistemas de Información Geográfica (SIG). El estudio fue llevado a cabo en un remanente grande de bosque primario de monson (94,000 ha), utilizando lemures como grupo indicador. La abundancia de los lemures y variables del microhábitat fueron medidas en 64 sitios estratificados de muestreo, dispersos en toda la región. Estas observaciones fueron incorporadas en el SIG con otras variables ambientales y datos de uso del suelo derivados de mapas e imágenes de satélite. Procedimientos estadísticos fueron aplicados para analizar hábitat de especies, predicciones y mapas de distribución de especies, así como para estimar tamaño poblacional de especies a lo largo del área de estudio. Patrones de agricultura con tumba y quema y perturbaciones antropocéntricas fueron también analizados para la identificación de áreas con bajo riesgo de perturbación cultural. Un mapa de distribución de riesgos se sobrepuso a un mapa de biodiversidad relativa de lemures para identificar áreas prioritarias de conservación con alta biodiversidad y bajo riego de perturbación a corto plazo. La diversidad de los lemures estuvo mas fuertemente influenciada por el clareado de hábitat y perturbación humana (cosechas, pastoreo y caza) dentro de una distancia de 8 km de las villas. La diversidad de los lemures fue mas alta en una región con mayor elevación y lluvia, distante de villas y carreteras. La única reserva existente en el área de estudio se localiza en una región con alto riesgo de perturbación. Casi la mitad de la reserva ha sido afectada durante los últimos 45 años. Existe un considerable margen para la reasignación de uso del suelo dentro del área de estudio que incluya un área protegida, una zona de amortiguamiento con caza y cosecha de madera controlada y una instalación adyacente para ecoturismo. Encontramos que la información generada por biodiversidad estratificada y análisis de uso del suelo con una intensidad de muestreo menor al 0.1% es suficiente para proveer la fundación objetiva de planes para biodiversidad regional.</p></abstract></profileDesc><revisionDesc><change when="1997-04-20">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-12-13">References added</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2017-02-9">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/DD4A3A15252EEF00A755FFA62CEEB89D118F4C30/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley component found"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Science Inc</publisherName><publisherLoc>Cambridge, MA, USA</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1523-1739</doi><issn type="print">0888-8892</issn><issn type="electronic">1523-1739</issn><idGroup><id type="product" value="COBI"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="CONSERVATION BIOLOGY">Conservation Biology</title><title type="short">Conservation Biology</title></titleGroup></publicationMeta><publicationMeta level="part" position="04002"><doi origin="wiley">10.1111/cbi.1997.11.issue-2</doi><numberingGroup><numbering type="journalVolume" number="11">11</numbering><numbering type="journalIssue" number="2">2</numbering></numberingGroup><coverDate startDate="1997-04-20">April 1997</coverDate></publicationMeta><publicationMeta level="unit" type="miscellaneous" position="0049800" status="forIssue"><doi origin="wiley">10.1046/j.1523-1739.1997.95283.x</doi><idGroup><id type="unit" value="COBI95283"></id></idGroup><countGroup><count type="pageTotal" number="15"></count></countGroup><titleGroup><title type="tocHeading1">Contributed Papers</title></titleGroup><copyright>Society for Conservation Biology</copyright><eventGroup><event type="firstOnline" date="2002-02-27"></event><event type="publishedOnlineFinalForm" date="2002-02-27"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:Header result:Header" date="2010-03-09"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-15"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-16"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="498">498</numbering><numbering type="pageLast" number="512">512</numbering></numberingGroup><correspondenceTo>A. P. SMITH University of New England, Armidale, NSW 2351 Australia</correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:COBI.COBI95283.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="0"></count><count type="tableTotal" number="0"></count><count type="formulaTotal" number="0"></count><count type="referenceTotal" number="0"></count><count type="wordTotal" number="9093"></count><count type="linksPubMed" number="0"></count><count type="linksCrossRef" number="0"></count></countGroup><titleGroup><title type="main">Regional Biodiversity Planning and Lemur Conservation with GIS in Western Madagascar</title><title type="subtitle">Planeacion de la Biodiversidad Regional y Conservación de Lemures con SIG en Madagascar Occidental</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>A. P.</givenNames><familyName>Smith</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>N.</givenNames><familyName>Horning</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a1"><personName><givenNames>D.</givenNames><familyName>Moore</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="AU"><unparsedAffiliation>University of New England, Armidale, NSW 2351 Australia,</unparsedAffiliation></affiliation><affiliation xml:id="a2"><unparsedAffiliation>STX Corporation, 4400 Forbes Boulevard, Lanham, MD 20706, U.S.A.</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><p>Primary forest cover in western Madagascar declined from 12.5% in 1950 to 2.8% in 1990. Approximately 23% of remaining forest is located within reserves, but this is no guarantee of protection. Forest cover in the Andranomena Reserve in western Madagascar has been reduced by 44% since 1950. The identification of priority areas for establishment of development projects has been constrained by lack of information on the distribution, abundance, and habitat requirements of threatened species and the size, condition, and threats to survival of forest remnants. We evaluate a rapid fauna survey and habitat modeling procedure specifically designed to generate information for reserve selection and design using Geographical Information Systems (GIS). The study was conducted in the largest remnant (94,000 ha) of primary monsoon rainforest in western Madagascar, using lemurs as an indicator group. Lemur abundance and microhabitat variables were measured at 64 stratified survey sites dispersed throughout the region. These records were incorporated into a GIS with other environmental and landuse data derived from maps and satellite imagery. Statistical procedures were applied to analyze species habitats, predict and map species distributions, and estimate species population sizes throughout the study area. Patterns of slash and burn agriculture and anthropogenic disturbance were also analyzed to identify areas at low risk of cultural disturbance. A map of disturbance risk was overlaid with a map of relative lemur biodiversity to identify conservation priority areas with high biodiversity and low risk of short term disturbance. Lemur diversity was most strongly influenced by habitat clearing and human disturbance (harvesting, stock grazing, and hunting) within 8 km of villages. Lemur diversity was highest in a region of higher elevation and rainfall, distant from villages and roads. The only existing reserve in the study area was located in a region of high disturbance risk. Almost half the reserve has been degraded during the past 45 years. There is considerable scope for re‐allocation of land use within the study area to include a core protected area, a buffer zone with controlled hunting and timber harvesting, and an adjacent ecotourism facility. We found that information generated by a stratified biodiversity and landuse survey at a sampling intensity of less than 0.1% was sufficient to provide an objective foundation for regional biodiversity planning.</p></abstract><abstract type="main" xml:lang="es"><p>La cobertura de bosques primarios en el oeste de Madagascar disminuyó de 12.5% en 1950 a 2.8% en 1990. Aproximadamente un 23% del bosque remanente está localizado en reservas, pero esto no garantiza su protección. Las reservas están sujetas a caza, recolección, pastoreo y actividades de agricultura con tumba y quema. La cobertura de la reserva de Andranomena en Madagascar ha sido reducida en un 44% desde 1950. En vista de esta amenaza, los bosques tropicales estacionales deciduos de monson del oeste de Madagascar pueden ser considerados entre los ecosistemas más amenazados del planeta. La identificación de áreas prioritarias para el establecimiento de Proyectos Integrales de Conservación y Desarrolla (PICD) ha sido restringida debido a la falta de información sobre la distribución, abundancia y requerimientos de hábitat de las especies amenazadas, además del tamaño, condición y amenazas para la supervivencia del bosque remanente. Evaluamos un muestreo rápido de la fauna y procedimientos de modelado de hábitat diseñados específicamente para generar información para la selección de reservas y su diseño, mediante el uso de Sistemas de Información Geográfica (SIG). El estudio fue llevado a cabo en un remanente grande de bosque primario de monson (94,000 ha), utilizando lemures como grupo indicador. La abundancia de los lemures y variables del microhábitat fueron medidas en 64 sitios estratificados de muestreo, dispersos en toda la región. Estas observaciones fueron incorporadas en el SIG con otras variables ambientales y datos de uso del suelo derivados de mapas e imágenes de satélite. Procedimientos estadísticos fueron aplicados para analizar hábitat de especies, predicciones y mapas de distribución de especies, así como para estimar tamaño poblacional de especies a lo largo del área de estudio. Patrones de agricultura con tumba y quema y perturbaciones antropocéntricas fueron también analizados para la identificación de áreas con bajo riesgo de perturbación cultural. Un mapa de distribución de riesgos se sobrepuso a un mapa de biodiversidad relativa de lemures para identificar áreas prioritarias de conservación con alta biodiversidad y bajo riego de perturbación a corto plazo. La diversidad de los lemures estuvo mas fuertemente influenciada por el clareado de hábitat y perturbación humana (cosechas, pastoreo y caza) dentro de una distancia de 8 km de las villas. La diversidad de los lemures fue mas alta en una región con mayor elevación y lluvia, distante de villas y carreteras. La única reserva existente en el área de estudio se localiza en una región con alto riesgo de perturbación. Casi la mitad de la reserva ha sido afectada durante los últimos 45 años. Existe un considerable margen para la reasignación de uso del suelo dentro del área de estudio que incluya un área protegida, una zona de amortiguamiento con caza y cosecha de madera controlada y una instalación adyacente para ecoturismo. Encontramos que la información generada por biodiversidad estratificada y análisis de uso del suelo con una intensidad de muestreo menor al 0.1% es suficiente para proveer la fundación objetiva de planes para biodiversidad regional.</p></abstract></abstractGroup></contentMeta><noteGroup><note xml:id="fn2" numbered="no"><p>Current address: P.O. Box 1377, Cambridge, VT 05444, U.S.A.</p></note></noteGroup></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Regional Biodiversity Planning and Lemur Conservation with GIS in Western Madagascar</title><subTitle>Planeacion de la Biodiversidad Regional y Conservación de Lemures con SIG en Madagascar Occidental</subTitle></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Regional Biodiversity Planning and Lemur Conservation with GIS in Western Madagascar</title></titleInfo><name type="personal"><namePart type="given">A. P.</namePart><namePart type="family">Smith</namePart><affiliation>University of New England, Armidale, NSW 2351 Australia,</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">N.</namePart><namePart type="family">Horning</namePart><affiliation>STX Corporation, 4400 Forbes Boulevard, Lanham, MD 20706, U.S.A.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D.</namePart><namePart type="family">Moore</namePart><affiliation>University of New England, Armidale, NSW 2351 Australia,</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="other" displayLabel="miscellaneous"></genre><originInfo><publisher>Blackwell Science Inc</publisher><place><placeTerm type="text">Cambridge, MA, USA</placeTerm></place><dateIssued encoding="w3cdtf">1997-04-20</dateIssued><copyrightDate encoding="w3cdtf">1997</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="words">9093</extent></physicalDescription><abstract lang="en">Primary forest cover in western Madagascar declined from 12.5% in 1950 to 2.8% in 1990. Approximately 23% of remaining forest is located within reserves, but this is no guarantee of protection. Forest cover in the Andranomena Reserve in western Madagascar has been reduced by 44% since 1950. The identification of priority areas for establishment of development projects has been constrained by lack of information on the distribution, abundance, and habitat requirements of threatened species and the size, condition, and threats to survival of forest remnants. We evaluate a rapid fauna survey and habitat modeling procedure specifically designed to generate information for reserve selection and design using Geographical Information Systems (GIS). The study was conducted in the largest remnant (94,000 ha) of primary monsoon rainforest in western Madagascar, using lemurs as an indicator group. Lemur abundance and microhabitat variables were measured at 64 stratified survey sites dispersed throughout the region. These records were incorporated into a GIS with other environmental and landuse data derived from maps and satellite imagery. Statistical procedures were applied to analyze species habitats, predict and map species distributions, and estimate species population sizes throughout the study area. Patterns of slash and burn agriculture and anthropogenic disturbance were also analyzed to identify areas at low risk of cultural disturbance. A map of disturbance risk was overlaid with a map of relative lemur biodiversity to identify conservation priority areas with high biodiversity and low risk of short term disturbance. Lemur diversity was most strongly influenced by habitat clearing and human disturbance (harvesting, stock grazing, and hunting) within 8 km of villages. Lemur diversity was highest in a region of higher elevation and rainfall, distant from villages and roads. The only existing reserve in the study area was located in a region of high disturbance risk. Almost half the reserve has been degraded during the past 45 years. There is considerable scope for re‐allocation of land use within the study area to include a core protected area, a buffer zone with controlled hunting and timber harvesting, and an adjacent ecotourism facility. We found that information generated by a stratified biodiversity and landuse survey at a sampling intensity of less than 0.1% was sufficient to provide an objective foundation for regional biodiversity planning.</abstract><abstract lang="es">La cobertura de bosques primarios en el oeste de Madagascar disminuyó de 12.5% en 1950 a 2.8% en 1990. Aproximadamente un 23% del bosque remanente está localizado en reservas, pero esto no garantiza su protección. Las reservas están sujetas a caza, recolección, pastoreo y actividades de agricultura con tumba y quema. La cobertura de la reserva de Andranomena en Madagascar ha sido reducida en un 44% desde 1950. En vista de esta amenaza, los bosques tropicales estacionales deciduos de monson del oeste de Madagascar pueden ser considerados entre los ecosistemas más amenazados del planeta. La identificación de áreas prioritarias para el establecimiento de Proyectos Integrales de Conservación y Desarrolla (PICD) ha sido restringida debido a la falta de información sobre la distribución, abundancia y requerimientos de hábitat de las especies amenazadas, además del tamaño, condición y amenazas para la supervivencia del bosque remanente. Evaluamos un muestreo rápido de la fauna y procedimientos de modelado de hábitat diseñados específicamente para generar información para la selección de reservas y su diseño, mediante el uso de Sistemas de Información Geográfica (SIG). El estudio fue llevado a cabo en un remanente grande de bosque primario de monson (94,000 ha), utilizando lemures como grupo indicador. La abundancia de los lemures y variables del microhábitat fueron medidas en 64 sitios estratificados de muestreo, dispersos en toda la región. Estas observaciones fueron incorporadas en el SIG con otras variables ambientales y datos de uso del suelo derivados de mapas e imágenes de satélite. Procedimientos estadísticos fueron aplicados para analizar hábitat de especies, predicciones y mapas de distribución de especies, así como para estimar tamaño poblacional de especies a lo largo del área de estudio. Patrones de agricultura con tumba y quema y perturbaciones antropocéntricas fueron también analizados para la identificación de áreas con bajo riesgo de perturbación cultural. Un mapa de distribución de riesgos se sobrepuso a un mapa de biodiversidad relativa de lemures para identificar áreas prioritarias de conservación con alta biodiversidad y bajo riego de perturbación a corto plazo. La diversidad de los lemures estuvo mas fuertemente influenciada por el clareado de hábitat y perturbación humana (cosechas, pastoreo y caza) dentro de una distancia de 8 km de las villas. La diversidad de los lemures fue mas alta en una región con mayor elevación y lluvia, distante de villas y carreteras. La única reserva existente en el área de estudio se localiza en una región con alto riesgo de perturbación. Casi la mitad de la reserva ha sido afectada durante los últimos 45 años. Existe un considerable margen para la reasignación de uso del suelo dentro del área de estudio que incluya un área protegida, una zona de amortiguamiento con caza y cosecha de madera controlada y una instalación adyacente para ecoturismo. Encontramos que la información generada por biodiversidad estratificada y análisis de uso del suelo con una intensidad de muestreo menor al 0.1% es suficiente para proveer la fundación objetiva de planes para biodiversidad regional.</abstract><relatedItem type="host"><titleInfo><title>Conservation Biology</title></titleInfo><titleInfo type="abbreviated"><title>Conservation Biology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0888-8892</identifier><identifier type="eISSN">1523-1739</identifier><identifier type="DOI">10.1111/(ISSN)1523-1739</identifier><identifier type="PublisherID">COBI</identifier><part><date>1997</date><detail type="volume"><caption>vol.</caption><number>11</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>498</start><end>512</end><total>15</total></extent></part></relatedItem><identifier type="istex">DD4A3A15252EEF00A755FFA62CEEB89D118F4C30</identifier><identifier type="DOI">10.1046/j.1523-1739.1997.95283.x</identifier><identifier type="ArticleID">COBI95283</identifier><accessCondition type="use and reproduction" contentType="copyright">Society for Conservation Biology</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Science Inc</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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