montane forest birds
Climate change will likely exacerbate harmful impacts of deforestation on species' elevational distributions. The matrix surrounding forest areas was a major factor influencing bird abundance: 65.5% of the species showed significant differences in abundance among sites surrounded by different matrices.
In addition, however, more radical changes are required that recognize biodiversity as a global public good, that
In this study, mist-nets and point-counts were used to compare the bird communities of primary forests on ridges in the Ailao Mountains of Yunnan, China, and secondary forests, firewood forests, and pine plantations in nearby lower elevation zones. Recent research has challenged these assumptions on the grounds that restoration implies long time delays and a low certainty of success. Mixed-species flocks reassembled in 10-ha fragments surrounded by Cecropia by 7-9 yr after isolation, and augmented their group territories by foraging in secondary forest outside fragments. Due to a lack of large forest seed dispersers, severely disturbed habitats appear less suitable.The original publication is available at http://www.springer.com/ The scattered and dwindling Polylepis woodlands of the high Andean global hotspot have been identified as being of particular importance to biodiversity conservation, and yet little is known of the make-up of their faunal communities, how these vary across landscapes, and how well species might tolerate matrix/edge habitats. Abundance and species richness declined dramatically after isolation, even though fragments were separated from continuous forest by only 70-650 m. Three species of obligate army ant followers disappeared within the first 2 yr after isolation. Solitary species were more variable in their responses, although several species returned to 10-ha fragments surrounded by Cecropia. Despite some conservation successes (especially at local scales) and increasing public and government interest in living sustainably, Species with small geographic ranges and species of terrestrial insectivores had low tolerance to fragmentation. It is a primary destination for millions of wintering migrant forest birds from western North America.
The full database will be publicly available in 2015.Deforestation for agriculture in the tropics, followed by abandonment, has resulted in large areas of secondary forest. Ponderosa Pine is typically the dominant tree from about 6000-8000 feet. 2011, while favoring species that are able to tolerate and thrive in human-modified landscapes, homogenizing the biota (Devictor et al. We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services.To learn more or modify/prevent the use of cookies, see our You can request the full-text of this chapter directly from the authors on ResearchGate.We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising. In the dry season of 1996, following local tradition each agricultural parcel was cleared of second-growth vegetation and then burned, planted, cultivated, and ( in six cases ) harvested 1 year later. Bird community response and tolerance to habitat disturbance was assessed by comparing bird presence and densities along a disturbance gradient, ranging from open pastures to closed mature forests.
Urbanization has The zone of agriculture will move upslope faster than the migrating trees and so landscape conversion will negate the ability of some species to respond to the new conditions. We demonstrate that differences in proportional use of vertical-height categories, including differences below the resolving power of visual estimates, can produce substantial differences in the capture rates of birds with identical abundance.
I broadcast vocalizations for nine bird species to evaluate biases in detection of bird vocalizations among four forested habitats (young, mature, and old aspendominated forests, and white spruce dominated forests), and in relation to height of the broadcast, whether the broadcast occurred before or after leaf formation, and the frequency of the broadcast vocalization. Vulnerability assessments based on ecological theory on avifaunal assemblages were then conducted, which suggested endemics in LFR to be more susceptible to disturbance than those in CNP. Agricultural land was characterised by an assemblage of widespread, abundant species very different from
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