Causes of habitat loss in a Neotropical landscape: The Panama Canal corridor

Rompré, Ghislain; Robinson, W. Douglas; Desrochers, André

doi:10.1016/j.landurbplan.2008.05.006

Cited by 22 publications

(36 citation statements)

References 64 publications

(120 reference statements)

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“…As APP preservadas constituem 50,60% Os resultados evidenciaram que a cobertura florestal remanescente do município de Sorocaba está essencialmente associada à presença de corpos hídricos e ao relevo mais acentuado, ou seja, áreas de difícil acesso à ocupação humana, padrão comum para a distribuição dos remanescentes de Mata Atlântica (SILVA et al, 2007) e de outros biomas ameaçados no mundo (VELDKAMP; LAMBIN, 2001;DITT et al, 2008;ROMPRÉ et al, 2008). Topografia complexa é frequentemente associada com florestas mais maduras do que as áreas com terreno mais plano, pois o acesso à colheita e ao desenvolvimento é limitado (VELDKAMP; LAMBIN, 2001;SILVA et al, 2007;DITT, 2008;ROMPRÉ et al, 2008).…”

Section: Resultsunclassified

Cenários ambientais para o ordenamento territorial de áreas de preservação permanente no município de Sorocaba, SP

Mello

Petri²,

Leite

et al. 2014

Rev. Árvore

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Este estudo objetivou analisar a importância das Áreas de Preservação Permanente (APP) para a manutenção dos remanescentes florestais no município de Sorocaba, SP. O mapa desses remanescentes foi elaborado com base em fotografias aéreas de 2006, e mapas de hidrografia e de declividade foram usados para determinação das APP. Compararam-se dois cenários: real (mata atual) e ideal (mata atual acrescida da restauração das APP), com base em métricas da paisagem. Os resultados indicaram que 19% do município se enquadra como APP e, dessa área, apenas 45% possui cobertura florestal. As APP preservadas representam 50% do total de cobertura florestal da paisagem. A restauração das APP representaria aumento de 16,68% para 28% de cobertura florestal da paisagem e possibilitaria o surgimento de fragmentos maiores que 3.000 ha, enquanto no cenário real os maiores fragmentos atingem 300 ha. Os remanescentes florestais se apresentaram intimamente ligados às APP: margens de rios, áreas alagáveis e encostas, onde a ocupação urbana foi dificultada e existe o instrumento legal de proteção. Esse quadro evidencia que as APP possuem papel fundamental na conservação florestal em um município bastante urbanizado, onde as áreas naturais sofrem muita pressão. A avaliação dos cenários mostrou que a incorporação dos dispositivos legais no planejamento e ordenamento territorial subsidia as estratégias voltadas para a manutenção de hábitats naturais e, consequentemente, a diminuição dos efeitos negativos sobre a biodiversidade. Entretanto, as mudanças recentes no Código Florestal podem representar um retrocesso no cenário ambiental nacional diante da crescente urbanização.

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Section: Resultsunclassified

Cenários ambientais para o ordenamento territorial de áreas de preservação permanente no município de Sorocaba, SP

Mello

Petri²,

Leite

et al. 2014

Rev. Árvore

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“…Each of the 32 subregions was characterized by biophysical (e.g., rainfall, topography) and socioeconomic variables (e.g., human population density, level of poverty), all of which may potentially help in understanding patterns and causes of habitat loss. Based on canonical correlation analyses (CCA), we identified the strongest associations between those characteristics and the likelihood of forested habitat conversion to agriculture (including pastures) and urbanization (for full details, see Rompre et al 2008). Annual rainfall and topography were negatively associated with habitat loss, whereas human population density (rural and urban) and the number of roads (density per subregion), proximity to a main highway or main city, and population wealth were highly associated with loss of forests (Rompre 2007, Rompre et al 2008.…”

Section: Causes Of Habitat Loss In the Regionmentioning

confidence: 99%

“…We used the SAR model of Seabloom et al (2002), including recently described distribution patterns of forest-dwelling bird species and habitat loss scenarios derived from biophysical and socioeconomic variables (Rompre et al , 2008, to predict local bird species loss near the Panama Canal. Additionally, we compared different realistic habitat loss scenarios, among themselves and with the SAR as a null hypothesis.…”

Section: Introductionmentioning

confidence: 99%

“…Several environmental factors influence bird species distribution patterns within the fragments still existing in Panama Canal region (Robinson et al 2004, showing nonrandom patterns in distribution of species richness. Similarly, environmental and socioeconomic factors strongly influence patterns of habitat loss in the Panama Canal region (Condit et al 2004, Rompre et al 2008. In this study, we used the term extirpation to express local or regional extinction or species loss from the study region, as opposed to global extinction.…”

Section: Introductionmentioning

confidence: 99%

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Predicting declines in avian species richness under nonrandom patterns of habitat loss in a Neotropical landscape

Rompré

Robinson

Desrochers

et al. 2009

Ecological Applications

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Abstract. One of the key concerns in conservation is to document and predict the effects of habitat loss on species richness. To do this, the species-area relationship (SAR) is frequently used. That relationship assumes random patterns of habitat loss and species distributions. In nature, however, species distribution patterns are usually nonrandom, influenced by biotic and abiotic factors. Likewise, socioeconomic and environmental factors influence habitat loss and are not randomly distributed across landscapes. We used a recently developed SAR model that accounts for nonrandomness to predict rates of bird species loss in fragmented forests of the Panama Canal region, an area that was historically covered in forest but now has 53% forest cover. Predicted species loss was higher than that predicted by the standard SAR. Furthermore, a species loss threshold was evident when remaining forest cover declined by 25%. This level of forest cover corresponds to 40% of the historical forest cover, and our model predicts rapid species loss past that threshold. This study illustrates the importance of considering patterns of species distributions and realistic habitat loss scenarios to develop better estimates of losses in species richness. Forecasts of tropical biodiversity loss generated from simple species-area relationships may underestimate actual losses because nonrandom patterns of species distributions and habitat loss are probably not unique to the Panama Canal region.

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“…2; Rompré et al 2009). Ces résultats proviennent de scé-narios de perte d'habitat conçus à partir de données environnementales et socio-économiques de la région à l' étude (facteurs affectant la répartition des espèces et facteurs pouvant causer la perte d'habitat; voir Rompré et al (2007Rompré et al ( , 2008 pour plus de détails). Une connaissance approfondie de ces facteurs et leurs effets actuels sur l'utilisation et la conversion des forêts au Panama a permis d' établir ces scénarios « réa-listes » de perte d'habitat.…”

Section: Seuil Critique D'habitat Pour Les Communautés D'espècesunclassified

Conservation de la biodiversité dans les paysages forestiers aménagés : utilisation des seuils critiques d’habitat

Rompré¹,

Boucher²,

Bélanger³

et al. 2010

The Forestry Chronicle

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RésuméAu Canada, comme dans les autres grandes régions forestières mondiales, les gestionnaires et le public interrogent les scientifiques sur les effets à long terme du régime d'aménagement au regard du maintien de la biodiversité. Des études récentes ont montré que les risques d' extinction locale d' espèces peuvent s'accroître fortement lorsque la proportion d'habitat franchit un certain seuil, nommé « seuil critique d'habitat ». La notion de seuil critique d'habitat peut s'appliquer soit à une population d'une espèce donnée, soit à une communauté formée de plusieurs espèces. Dans le cas d'une population, ce seuil est défini comme la proportion minimale d'habitat qu'il faut conserver dans un paysage pour maintenir une population viable. Dans le cas des communautés, le seuil critique d'habitat correspond à la proportion minimale d'habitat en deçà de laquelle on assiste à une diminution importante du nombre d' espèces au sein de la communauté d' origine. La plupart des experts sont d'avis que les espèces spécialistes et sensibles sont les premières à disparaître. Bien que des efforts doivent encore être consentis pour l'identification des seuils au sein des différents écosystèmes forestiers, les résultats de plusieurs études convergent et permettent de conclure à la pertinence de leur utilisation dans un cadre de planification forestière et de maintien de la biodiversité. Les études montrent que le seuil critique d'habitat pour des espèces à grand domaine vital (tels que les oiseaux) peut se situer entre 30 % à 40 % de la proportion de l'habitat considéré (ex : vieilles forêts) observé sous un régime de perturbations naturelles. Nous suggérons, afin de protéger les espèces sensibles et d' embrasser l'incertitude associée aux seuils, de maintenir au moins 40 % des habitats résiduels. D'après le principe de précaution, nous suggérons de considérer ces seuils comme étant le minimum acceptable en deçà duquel il deviendrait difficile d'assurer la conservation de la biodiversité. Toutefois, pour être efficace, leur utilisation doit être combinée à de bonnes connaissances du fonctionnement des écosystèmes naturels.Mots clés : seuil écologique, aménagement écosystémique, perte d'habitat, écosystème forestier, aménagement forestier, population, communauté, biodiversité, conservation. AbstRActIn Canada, as in other large forested countries of the world, managers and scientists alike question what can happen to forest biodiversity under long-term industrial forest management. Recent studies may help us understand how species react when habitat is lost past a certain threshold in the landscape. In the case of population, a "critical threshold for habitat" does exist in forested habitat, which is defined by the minimal proportion of habitat needed to be preserved to avoid drastic population declines or massive species loss. In this paper, two types of thresholds are described, the first refers to population, and the second refers to the community of species. Many ecologists agree with the assumption that the specialist, sen...

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Causes of habitat loss in a Neotropical landscape: The Panama Canal corridor

Cited by 22 publications

References 64 publications

Cenários ambientais para o ordenamento territorial de áreas de preservação permanente no município de Sorocaba, SP

Cenários ambientais para o ordenamento territorial de áreas de preservação permanente no município de Sorocaba, SP

Predicting declines in avian species richness under nonrandom patterns of habitat loss in a Neotropical landscape

Conservation de la biodiversité dans les paysages forestiers aménagés : utilisation des seuils critiques d’habitat

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