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27 results for “oak woodlands”
Carbon and water fluxes in a cork oak woodland in Central Portugal
<p>The Data set contains eddy covariance measurements of carbon and water fluxes and ancillary measurements observed at a cork oak woodland (<em>Quercus suber </em>L.) in central Portugal. The climate is Mediterranean, with mild, wet winters and hot, dry summers.</p> <p>Data are available in the file data.csv (UTF-8 encoding), the description of the variables and units are available in the file meta.csv (UTF-8 encoding).</p> <p>Further description of the site, methods and data processing can be viewed in the files metadata.pdf and metadata.csv</p> <p> </p>
Ungulates mitigate the effects of drought and shrub encroachment on the fire hazard of Mediterranean oak woodlands
<p>Dataset included: Shrub density; Shrub biomass; Fuel load of <em>Cistus ladanifer</em>; Fuel load herbs; Fuel load litter</p>
Severity outweighs pyrodiversity in shaping avian and bat species distributions following an oak woodland mega-fire
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Bringing the concept of ammonia critical levels into managing cork-oak woodland for conservation
<p>Agricultural activities often emit excessive nitrogen concentrations to nearby habitats, impacting ecosystems structure and functioning. To protect them, critical levels were established as the concentration above which direct adverse effects on ecosystems may arise. However, due to lack of tools, critical levels are seldom applied in management strategies for conservation. Our objective was to provide a spatial-explicit tool to incorporate the concept of ammonia critical levels in management practices of atmospheric nitrogen impacts. To do that, lichens diversity was sampled in 19 plots at a cork oak woodland (Montado), a High Nature Value Farmland where multiple agricultural activities, surrounded by high-intensity agricultural activities, coexist. We inferred and selected the best performing trait-based metrics and determined the main environmental drivers of change. The most responsive metric was the abundance of oligotrophic lichen species, which was likely responding to nitrogen incoming from nearby high-intensity agricultural areas. The low intensity agricultural activities, cattle grazing within the study area, had no effect. Using the known ammonia critical levels for that ecosystem, we modelled and mapped the long-term critical levels exceedance for the entire study area. This allowed us to signal high intensity agriculture as the source of impact and to map the areas where management practices need further attention under a conservation perspective: either decreasing fertilization in nearby fields or by considering these as buffer areas, outside the scope of conservation.</p>
Twenty-five years of tree demography in a frequently burned oak woodland
<p>Due to decades of fire suppression, much of the Upper Midwest savanna habitat has converted to oak woodland. In efforts to restore oak savanna habitat, fire has been re-introduced in many of these woodlands. A primary purpose of these burns is to kill the fire-sensitive mesophytic tree species, which had established themselves during the decades of fire suppression, reduce the number of understory trees, and preserve the larger more widely spaced oaks. It is clear from ongoing efforts that restoring oak savannas will require frequent fires over decades. But frequent fires over the long term can also threaten the desirable oaks. Long-term demographic studies at savanna restoration sites experiencing frequent fires are necessary to determine the extent to the frequent burns are supporting and/or confounding restoration goals. Results presented here are from a twenty-five-year demographic study of an Upper Midwest bur oak (<i>Quercus macrocarpa</i>)<i> </i>savanna/woodland experiencing frequent fire, during which both the survival and growth of more than 9,000 trees were documented. Survival was assessed annually and growth every five years. In the face of frequent fires, stem survival was found to be strongly associated with tree species, stem size, and stem growth. In turn, stem growth was found to be related to tree species and stem size. Decades of frequent burning in this oak woodland have substantially reduced the abundance of unwanted trees, specifically mesophytic species and <i>Q. ellipsoidalis</i>, the latter which outcompetes <i>Q. macrocarpa </i>in the absence of fire. While <i>Q. macrocarpa</i> mid-sized (10-25 cm dbh) and large (<u>></u> 25 cm dbh) trees are quite resistant to fire and now dominate the savanna landscape, they are not immune from fire-induced mortality. It is recommended that the number and density of these trees should be re-evaluated every few years to ensure that desirable numbers remain. If necessary, fires should be suspended for a period of time. This will give smaller <i>Q. macrocarpa </i>trees time to grow larger and become more fire-resistant, thereby ensuring successive generations of <i>Q. macrocarpa</i>. </p>
Twenty-five years of tree demography in a frequently burned oak woodland
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Dry-season grazing with small ruminants enhances native diversity in invaded oak woodlands
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Walnut Gulch Experimental Watershed site, station Oak woodland vegetation zone in Walnut Gulch Watershed, study of plant cover of Ericameria laricifolia (turpentine bush) in units of percent on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Walnut Gulch Experimental Watershed (WGE) contains plant cover of Ericameria laricifolia (turpentine bush) measurements in percent units and were aggregated to a yearly timescale.
Walnut Gulch Experimental Watershed site, station Oak woodland vegetation zone in Walnut Gulch Watershed, study of plant cover of Krameria erecta (littleleaf ratany) in units of percent on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Walnut Gulch Experimental Watershed (WGE) contains plant cover of Krameria erecta (littleleaf ratany) measurements in percent units and were aggregated to a yearly timescale.
Walnut Gulch Experimental Watershed site, station Oak woodland vegetation zone in Walnut Gulch Watershed, study of plant cover of Prosopis velutina (velvet mesquite) in units of percent on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Walnut Gulch Experimental Watershed (WGE) contains plant cover of Prosopis velutina (velvet mesquite) measurements in percent units and were aggregated to a yearly timescale.
Walnut Gulch Experimental Watershed site, station Oak woodland vegetation zone in Walnut Gulch Watershed, study of plant cover of shrubs in units of percent on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Walnut Gulch Experimental Watershed (WGE) contains plant cover of shrubs measurements in percent units and were aggregated to a yearly timescale.
Walnut Gulch Experimental Watershed site, station Oak woodland vegetation zone in Walnut Gulch Watershed, study of plant species richness in units of noper30pt5m on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Walnut Gulch Experimental Watershed (WGE) contains plant species richness measurements in noper30pt5m units and were aggregated to a yearly timescale.
FIGURES 16–21 in A new species of Aphonopelma (Araneae: Mygalomorphae: Theraphosidae) from the Madrean pine-oak woodlands of northeastern Sonora, Mexico
FIGURES 16–21. Morphology of Aphonopelma bacadehuachi, sp. nov. from Sonora, Mexico (female paratype, APH-1356). 16, carapace, dorsal view; 17, right pedipalp, prolateral view; 18, coxa of right leg I, prolateral view; 19, spermathecae; 20, metatarsus and tarsus of left leg III, ventral view; 21, metatarsus and tarsus of left leg IV, ventral view. Scale bar = 5 mm (except for spermathecae, scale bar = 2 mm).
FIGURE 22 in A new species of Aphonopelma (Araneae: Mygalomorphae: Theraphosidae) from the Madrean pine-oak woodlands of northeastern Sonora, Mexico
FIGURE 22. Map of the southwestern United States and northwestern Mexico showing the distributions of the Madrean members of the Marxi species group and Aphonopelma mooreae. The localities for A. mooreae are based on reports provided in iNaturalist (https://www.inaturalist.org/observations?taxon_id=264079, accessed 16 March 2019). The distribution for A. peloncillo only reflects specimens from the eastern foothills of the Peloncillo Mountains and the Animas Valley in New Mexico and does not include several specimens outside of this area as reported in Hamilton et al. (2016); further research is necessary to confirm the identity of the latter specimens. State abbreviations: AZ = Arizona, NM = New Mexico, SON = Sonora, CHI = Chihuahua. The Madrean pine-oak woodlands shapefile was "exploded" from a larger shapefile depicting the planet's biodiversity hotspots (downloaded from http://legacy.cepf.net/SiteAssets/hotspots_2016_1.zip, accessed 16 March 2019).
FIGURE 3–4 in A new species of Aphonopelma (Araneae: Mygalomorphae: Theraphosidae) from the Madrean pine-oak woodlands of northeastern Sonora, Mexico
FIGURE 3–4. Dorsal habitus of Aphonopelma bacadehuachi, sp. nov. from Sonora, Mexico. 3, male holotype (APH-1357); 4, female paratype (APH-1356). Scale bar = 20 mm.
FIGURE 2 in A new species of Aphonopelma (Araneae: Mygalomorphae: Theraphosidae) from the Madrean pine-oak woodlands of northeastern Sonora, Mexico
FIGURE 2. Maximum likelihood phylogeny of the Madrean members of the Marxi species group based on COX1 mtDNA. For presentation sake, specimen labels have been removed from the tree tips. Numbers along branches indicate maximum likelihood bootstrap support values. Photograph is an adult male Aphonopelma madera from the Huachuca Mountains in southeastern Arizona.
FIGURES 5–15 in A new species of Aphonopelma (Araneae: Mygalomorphae: Theraphosidae) from the Madrean pine-oak woodlands of northeastern Sonora, Mexico
FIGURES 5–15. Morphology of Aphonopelma bacadehuachi, sp. nov. from Sonora, Mexico (male holotype, APH-1357). 5, carapace, dorsal view; 6, patella and tibia of left leg I, prolateral view; 7, tibial apophysis of left leg I, prolateral view; 8, metatarsus and tarsus of left leg III, ventral view; 9, metatarsus and tarsus of left leg IV, ventral view; 10, left pedipalp, retrolateral view; 11, left pedipalp, prolateral view; 12, femur of leg III, dorsal view; 13, palpal bulb, prolateral view; 14, palpal bulb, retrolateral view; 15, palpal bulb, dorsal view. Scale bar = 5 mm (except for palpal bulb and illustration of tibial apophysis, scale bar = 2 mm).
FIGURE 1 in A new species of Aphonopelma (Araneae: Mygalomorphae: Theraphosidae) from the Madrean pine-oak woodlands of northeastern Sonora, Mexico
FIGURE 1. Scatterplot of principal components for measurements of mature male (top) and female (bottom) Madrean Aphonopelma species. Percentage values indicate the proportion of variation explained by a particular principal component (PC1 and PC2).
Data from: Prescribed fire and conifer removal promote positive understorey vegetation responses in oak woodlands
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Data from: Spatial distribution of oak mistletoe as it relates to habits of oak woodland frugivores
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