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7,659 result(s) for "bosque"
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Landscape trajectory of natural boreal forest loss as an impediment to green infrastructure
Loss of natural forests by forest clearcutting has been identified as a critical conservation challenge worldwide. This study addressed forest fragmentation and loss in the context of the establishment of a functional green infrastructure as a spatiotemporally connected landscape-scale network of habitats enhancing biodiversity, favorable conservation status, and ecosystem services. Through retrospective analysis of satellite images, we assessed a 50- to 60-year spatiotemporal clearcutting impact trajectory on natural and near-natural boreal forests across a sizable and representative region from the Gulf of Bothnia to the Scandinavian Mountain Range in northern Fennoscandia. This period broadly covers the whole forest clearcutting period; thus, our approach and results can be applied to comprehensive impact assessment of industrial forest management. The entire study region covers close to 46,000 km² of forest-dominated landscape in a late phase of transition from a natural or near-natural to a land-use modified state. We found a substantial loss of intact forest, in particular of large, contiguous areas, a spatial polarization of remaining forest on regional scale where the inland has been more severely affected than the mountain and coastal zones, and a pronounced impact on interior forest core areas. Salient results were a decrease in area of the largest intact forest patch from 225,853 to 68,714 ha in the mountain zone and from 257,715 to 38,668 ha in the foothills zone, a decrease from 75% to 38% intact forest in the inland zones, a decrease in largest patch core area (assessed by considering 100-m patch edge disturbance) from 6114 to 351 ha in the coastal zone, and a geographic imbalance in protected forest with an evident predominance in the mountain zone. These results demonstrate profound disturbance of configuration of the natural forest landscape and disrupted connectivity, which challenges the establishment of functional green infrastructure. Our approach supports the identification of forests for expanded protection and conservation-oriented forest landscape restoration. La pérdida de bosques naturales por causa de la tala uniforme de árboles en los mismos ha sido identificada como unreto muyimportantepara la conservación global. Esteestudioabordó la fragmentación y pérdida de bosques en el contexto del establecimiento de una infraestructura verde funcional como una red de hábitats a escala de paisaje conectados espacio-temporalmente que mejoren la biodiversidad, los estados favorables de conservación y los servicios ambientales. Por medio de un análisis retrospectivo de imágenes satelitales evaluamos una trayectoria de impacto espacio-temporal de 50 a 60 años de tala uniforme sobre bosques boreales naturales y casi naturales en una región considerable y representativa desde el Golfo de Botnia hasta la Cordillera Escandinava en el norte de Fenoescandia. Este rango cubre todo el periodo de tala uniforme en el bosque en términos generales; por lo tanto, nuestra metodología y resultados pueden aplicarse a la evaluación completa del impacto del manejo industrial de bosques. Toda la región de estudio cubría hasta 46,000 km² de paisaje dominado por bosque en una etapa tardía de la transición entre el estado natural o casi natural y el estado de uso de suelo modificado. Encontramos una pérdida sustancial de bosque intacto, particularmente para áreas grandes y contiguas, una polarización espacial del bosque restantea una escala regional en la que tierra adentro hay mayores afectaciones que en las zonas montañosas y costeras, y un impacto pronunciado sobre las áreas nucleares de los bosques interiores. Los resultados salientes fueron una disminución en el área del fragmento más grande de bosque intacto de 225, 853 a 68, 714 ha en la zona montañosa y de 257, 715 a 38, 668 ha en la zona de pie de monte, una disminución del 75% al 38% de bosque intacto en las zonas tierra adentro, una disminución en el área nuclear del fragmento más grande (valorada al considerar 100-m de perturbación al borde del fragmento) de 6, 114 a 351 ha en la zona costera, y un desbalance geográfico en los bosques protegidos con una evidente mayoría en la zona montañosa. Estos resultados demuestran una perturbación profunda de la configuración del paisaje de bosque natural y una conectividad interrumpida, lo que presenta un reto para el establecimiento de una infraestructura verde funcional. Nuestro enfoque sustenta la identificación de bosques para su protección expandida y la restauración del paisaje de bosque orientada hacia la conservación. 森林皆伐造成的自然森林丧失被认为是全世界面胳的重要保护挑战。功能性绿色基础设施是提高生物多 样性、保护状况和生态系统服务的时空上连接的景观尺度生境网络 本研究关注其建设中的森林破碎化和森林 丧失同题。通过分析卫星图像, 我们评估7\"芬诺斯坎通亚 (Fennoscancdia) 北部波的尼亚湾 (Gulf of Bothnia) 到 斯堪的纳维亚山脉(Scandinavian Mountain Range)大面积有代表性的自然和接近自然的北方森林受到 50-60 年森林皆伐的影响轨迹。这一时间段大致包括了整个森林皆伐期,因此我们的方法和结果可以应用于工业森林 管理的综合影响评估。整个研究区域覆盖了近紙000平方公里以森林为主的景風处于自然或接近自然的景 观向人为改造的土地利用类型过渡的后期。我们发现原始森林严重丧失,特别是大面积的连续区域,_ 余的森林 在区域尺度上发生空间的两极分化,其中内陆比山区和沿海地区受到更为严重的影响,内部森林核心区也受到明 显影响。突出的结果包括:山区最大的原始森林斑块面积从225,853公顷减少到 68,714 公埂而在山麓地区 从 257,715 公現滅少到38,668 公埂, 内陆地区从 75% 减少到 38%, 最大的斑块核心区域面积减少(根据 6,114 公顷到 351 公顷的沿海地区 100 米斑块边缘干扰的评估结果X 以及受保护森林的地理分布不平衡(主要在山 区) 。这些结果表明,自然森林景观配置受到严重干抵连接度受到破坏,这对建设功能性绿色基础设施提出了 挑战。我们的方法有助于确定扩大保护及进行保护导向的森林景观恢复的森林范围。
Killer of witches : the life and times of Yellow Boy, Mescalero Apache
\"Killer of Witches is a powerful story; truth told with fiction that transports the reader to a different background, culture, history, time, and religion. It is the other side of Apache history lived by a people fighting the tsunami of Americans migrating west and the terrors of their supernatural insights. Five hundred Mescalero Apaches at General James H. Carlton's Bosque Redondo Apache-Navajo concentration camp near Fort Sumner, New Mexico, disappear like ghosts in the wind on a cold November night in1865. The Army never finds the Apaches including a five year-old boy with them, who becomes a legend\"-- Provided by publisher.
Contemporary Assessment of Change in Humid Tropical Forests
In recent decades the rate and geographic extent of land-use and land-cover change has increased throughout the world's humid tropical forests. The pan-tropical geography of forest change is a challenge to assess, and improved estimates of the human footprint in the tropics are critical to understanding potential changes in biodiversity. We combined recently published and new satellite observations, along with images from Google Earth and a literature review, to estimate the contemporary global extent of deforestation, selective logging, and secondary regrowth in humid tropical forests. Roughly 1.4% of the biome was deforested between 2000 and 2005. As of 2005, about half of the humid tropical forest biome contained 50% or less tree cover. Although not directly comparable to deforestation, geographic estimates of selective logging indicate that at least 20% of the humid tropical forest biome was undergoing some level of timber harvesting between 2000 and 2005. Forest recovery estimates are even less certain, but a compilation of available reports suggests that at least 1.2% of the humid tropical forest biome was in some stage of long-term secondary regrowth in 2000. Nearly 70% of the regrowth reports indicate forest regeneration in hilly, upland, and mountainous environments considered marginal for large-scale agriculture and ranching. Our estimates of the human footprint are conservative because they do not resolve very small-scale deforestation, low-intensity logging, and unreported secondary regrowth, nor do they incorporate other impacts on tropical forest ecosystems, such as fire and hunting. Our results highlight the enormous geographic extent of forest change throughout the humid tropics and the considerable limitations of the science and technology available for such a synthesis.
The forest in the clouds
Describes some of the exotic plants and animals that live in the cloud forest of Costa Rica, and discusses some environmental threats faced by this region.
Using soundscapes to detect variable degrees of human influence on tropical forests in Papua New Guinea
There is global concern about tropical forest degradation, in part, because of the associated loss of biodiversity. Communities and indigenous people play a fundamental role in tropical forest management and are often efficient at preventing forest degradation. However, monitoring changes in biodiversity due to degradation, especially at a scale appropriate to local tropical forest management, is plagued by difficulties, including the need for expert training, inconsistencies across observers, and lack of baseline or reference data. We used a new biodiversity remote-sensing technology, the recording of soundscapes, to test whether the acoustic saturation of a tropical forest in Papua New Guinea decreases as land-use intensity by the communities that manage the forest increases. We sampled soundscapes continuously for 24 hours at 34 sites in different land-use zones of 3 communities. Land-use zones where forest cover was fully retained had significantly higher soundscape saturation during peak acoustic activity times (i.e., dawn and dusk chorus) compared with land-use types with fragmented forest cover. We conclude that, in Papua New Guinea, the relatively simple measure of soundscape saturation may provide a cheap, objective, reproducible, and effective tool for monitoring tropical forest deviation from an intact state, particularly if it is used to detect the presence of intact dawn and dusk choruses. Existe una preocupación global por la degradación del bosque tropical, en parte, por la pérdida asociada de la biodiversidad. Las comunidades y personas indígenas juegan un papel fundamental en el manejo del bosque tropical y son continuamente eficientes en la prevención de la degradación del bosque. Sin embargo, el monitoreo de cambios en la biodiversidad por causa de la degradación, especialmente a una escala apropiada para el manejo del bosque tropical local, está plagado de dificultades, incluyendo la necesidad de entrenamiento por expertos, inconsistencias entre los observadores, y la falta de una línea base de datos de referencia. Utilizamos una tecnología nueva de detección remota de la biodiversidad, la grabación del paisaje sonoro, para probar si la saturación acústica de un bosque tropical en Papua Nueva Guinea disminuye conforme incrementa la intensidad del uso de suelo por las comunidades que manejan el bosque. Muestreamos el paisaje sonoro continuamente durante 24 horas en 34 sitios en diferentes zonas de uso de suelo de tres comunidades. Las zonas de uso de suelo en donde la cobertura forestal se retuvo completamente tuvieron una saturación de paisaje sonoro significativamente más alta durante los momentos cumbre de actividad acústica (es decir, el coro al amanecer y al atardecer) en comparación con los tipos de uso de suelo con cobertura forestal fragmentada. Concluimos que, en Papua Nueva Guinea, la medida relativamente simple de la saturación del paisaje sonoro puede proporcionar una herramienta barata, objetiva, reproducible y efectiva para el monitoreo de la desviación del bosque tropical a partir de un estado intacto, particularmente si se utiliza para detectar la presencia de coros intactos al amanecer y al atardecer.
Green encounters
Since the 1970s and 1980s, Monte Verde, Costa Rica has emerged as one of the most renowned sites of nature conservation and ecotourism in Costa Rica, and some would argue, Latin America. It has received substantial attention in literature and media on tropical conservation, sustainable development, and tourism. Yet most of that analysis has uncritically evaluated the Monte Verde phenomenon, using celebratory language and barely scratching the surface of the many-faceted socio-cultural transformations provoked by and accompanying environmentalism. Because of its stature, Monte Verde represents an ideal case study to examine the socio-cultural and political complexities and dilemmas of practicing environmentalism in rural Costa Rica. Based on many years of close observation, this book offers rich and original material on the ongoing struggles between environmental activists and of collective and oppositional politics to Monte Verde's new \"culture of nature.\"
fungal perspective on conservation biology
Hitherto fungi have rarely been considered in conservation biology, but this is changing as the field moves from addressing single species issues to an integrative ecosystem‐based approach. The current emphasis on biodiversity as a provider of ecosystem services throws the spotlight on the vast diversity of fungi, their crucial roles in terrestrial ecosystems, and the benefits of considering fungi in concert with animals and plants. We reviewed the role of fungi in ecosystems and composed an overview of the current state of conservation of fungi. There are 5 areas in which fungi can be readily integrated into conservation: as providers of habitats and processes important for other organisms; as indicators of desired or undesired trends in ecosystem functioning; as indicators of habitats of conservation value; as providers of powerful links between human societies and the natural world because of their value as food, medicine, and biotechnological tools; and as sources of novel tools and approaches for conservation of megadiverse organism groups. We hope conservation professionals will value the potential of fungi, engage mycologists in their work, and appreciate the crucial role of fungi in nature.
Potential for Species Conservation in Tropical Secondary Forests
In the wake of widespread loss of old-growth forests throughout the tropics, secondary forests will likely play a growing role in the conservation of forest biodiversity. We considered a complex hierarchy of factors that interact in space and time to determine the conservation potential of tropical secondary forests. Beyond the characteristics of local forest patches, spatial and temporal landscape dynamics influence the establishment, species composition, and persistence of secondary forests. Prospects for conservation of old-growth species in secondary forests are maximized in regions where the ratio of secondary to old-growth forest area is relatively low, older secondary forests have persisted, anthropogenic disturbance after abandonment is relatively low, seed-dispersing fauna are present, and old-growth forests are close to abandoned sites. The conservation value of a secondary forest is expected to increase over time, as species arriving from remaining old-growth forest patches accumulate. Many studies are poorly replicated, which limits robust assessments of the number and abundance of old-growth species present in secondary forests. Older secondary forests are not often studied and few long-term studies are conducted in secondary forests. Available data indicate that both old-growth and second-growth forests are important to the persistence of forest species in tropical, human-modified landscapes.
Conservation of Epiphyte Diversity in an Andean Landscape Transformed by Human Land Use
Epiphytes are diverse and important elements of tropical forests, but as canopy-dwelling organisms, they are highly vulnerable to deforestation. To assess the effect of deforestation on epiphyte diversity and the potential for epiphyte conservation in anthropogenically transformed habitats, we surveyed the epiphytic vegetation of an Ecuadorian cloud forest reserve and its surroundings. Our study was located on the western slopes of the Andes, a global center of biodiversity. We sampled vascular epiphytes of 110 study plots in a continuous primary forest; 14 primary forest fragments; isolated remnant trees in young, middle-aged, and old pastures; and young and old secondary forests. It is the first study to include all relevant types of habitat transformation at a single study site and to compare epiphyte diversity at different temporal stages of fragmentation. Epiphyte diversity was highest in continuous primary forest, followed by forest fragments and isolated remnant trees, and lowest in young secondary forests. Spatial parameters of habitat transformation, such as fragment area, distance to the continuous primary forest, or distance to the forest edge from inside the forest, had no significant effect on epiphyte diversity. Hence, the influence of dispersal limitations appeared to be negligible or appeared to operate only over very short distances, whereas microclimatic edge effects acted only in the case of completely isolated trees, but not in larger forest fragments. Epiphyte diversity increased considerably with age of secondary forests, but species assemblages on isolated remnant trees were impoverished distinctly with time since isolation. Thus, isolated trees may serve for recolonization of secondary forests, but only for a relatively short time. We therefore suggest that the conservation of even small patches of primary forest within agricultural landscape matrices is essential for the long-term maintenance of the high epiphyte diversity in tropical cloud forests.