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419 results for “Elevational gradient”
FIG. 1 in A small elevational gradient shows negative bottom-to-top bryophyte richness in a seasonally dry forest in Brazil
FIG. 1. — Results of the clustering with weighted average between Caatinga areas (including rocky outcrops) based on the Sørensen similarity index showing that the bryophyte flora of Catimbau NP is singular: dotted arm indicates Rocky outcrop in Bahia state; brackets in light gray indicates areas in Paraíba state and the bold arms indicate the areas in Pernambuco state; site P29, highlighted in blue shows the isolation of Catimbau NP. Bahia state is approximately 370 km from Pernambuco state and 930 km from Paraíba, in a straight line. Coefficient of Cofenetic Correlation (CCC) = 0.80. Own illustration: Fabronia ciliaris (Brid.) Brid.
FIG. 4 in A small elevational gradient shows negative bottom-to-top bryophyte richness in a seasonally dry forest in Brazil
FIG. 4. — Venn diagram showing the low percentage of similarity between the belts levels based on the Sørensen-Dice index, total number of species per belt, and the amount of species shared between each belt.
FIG. 2 in A small elevational gradient shows negative bottom-to-top bryophyte richness in a seasonally dry forest in Brazil
FIG. 2. — Elevational distribution and representativeness of bryophyte families in the Catimbau National Park. The width of the bars denotes the number of species per family. The elevation is measured in meters.
Data from: Factors affecting the nesting success of Swainson's thrush (Catharus ustulatus) along an elevational gradient
<p>Montane birds face several ecological challenges during the breeding season, including nest predators, competition for territory, and food availability. The continuing effects of climate change are causing shifts in these plant and animal communities, as well as changes in abiotic factors such as increased temperature and precipitation effects, adding additional stressors that could affect nest survival, putting their populations at risk. The Swainson's thrush (<em>Catharus ustulatus</em>) is migratory songbird which is moderately common and breeds along a wide elevation gradient within this system (200-1,250m). Populations of Swainson's thrush were once declining, though recent research shows their ranges to be shifting downwards, potentially as the result of increased precipitation and temperature at higher elevations. Although lower elevations might be more favorable in terms of climactic conditions, nest predation is higher at lower elevations in other systems. Thus, this species might be faced with the opposing pressures of adverse climactic conditions at higher elevations and increased predation at lower elevations. Nest survival is a fundamental process to population size, and therefore, is important in evaluating how montane breeding birds are adjusting to the changing climate. We monitored nests of Swainson's thrush along an elevation gradient in the White Mountain National Forest in New Hampshire in 2016, 2018, 2019 and 2021 at two sites: Mt. Jefferson (500-1,250m) and Bartlett Experimental Forest (200-300m). We found a significant negative effect of rain intensity (millimeters per hour per day) as well as a negative interaction effect of elevation with minimum daily temperature and average daily temperature, on the daily survival rate of Swainson's thrush. Our results provide evidence that nesting survival of montane breeding birds could be at risk as heavier precipitation events become more frequent and intense, a likely outcome due to the changing climate within the White Mountains and other montane ecosystems, putting other passerine species at risk in this system. </p>
Bumble bee niche overlap along an elevation gradient: How traits can inform novel competitive pressures under climate change
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Community characteristics of forest understory birds along an elevational gradient in the Horn of Africa: A multi-year baseline of Afromontane birds
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Pollen-chemistry variations along elevation gradients and their implications for a proxy for UV-B radiation in the plant-fossil record
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Data from: Occupancy patterns and upper range limits of lowland Bornean birds along an elevational gradient
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Data from: Factors affecting the nesting success of Swainson's thrush (Catharus ustulatus) along an elevational gradient
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Predators like it hot: Thermal mismatch in a predator-prey system across an elevational tropical gradient
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Data from: Variation in biodiversity and abundance of functional groups of arthropods along a tropical elevational gradient in Puerto Rico
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Functional and phylogenetic structure of forest bird assemblages along an Afrotropical elevational gradient
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Data from: Environmental variation associated with topography explains butterfly diversity along a tropical elevation gradient
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Semi‐quantitative metabarcoding reveals how climate shapes arthropod community assembly along elevation gradients on Hawaii Island
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Resources and seasonality drive the composition of mixed-species bird flocks along an elevational gradient in the Himalaya
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Decomposing an elevational gradient in predation by insectivorous birds
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Radiocarbon dates for an elevational gradient by Toolik Lake, North Slope of Alaska 1988.
Two cores of peat, approximately 15 cm2, were cut to the depth at which mineral soils were encountered at each site. The sites of sampling correspond to an elevational gradient leading from the lakeside upslope to the begining of the water track at the ridgetop. Each sample was divided into three sections, one section to be used for radiocarbon age , one for loss on ignition, and the remainder to be kept for future needs.
Tree seedling densities across an elevation and moisture gradient from the Coweeta Hydrologic Laboratory from 1996 to 1999
First year seedling densities of all woody perennials (trees, vines, shrubs) were censused across five permanent vegetation plots to compare spatial distributions with adult trees, seed densities and seed bank densities.
Rhododendron maximum cover across an elevation gradient from the Coweeta Hydrologic Laboratory from 1997 to 1999
Rhododendron maximum leaf area was measured at 167 locations to determine the spatial extent of this understory shrub, and compare Rhododendron maximum cover with seedling germination rates and seedling diversity (measured in another study). Rhododendron maximum leaf area index was determined at 167 points within each permanent vegetation plot. The initial 86 points were sampled in 1997, and the remainder sampled in the summer of 1999.
Nitrogen transformation along an elevational and vegetative gradient from the Coweeta Hydrologic Laboratory from 1991 to 1995
Examination of N-transformation along elevation and vegetation gradient. These measurements are analysis of plant nitrogen availability and overall site productivity.
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International Brain Laboratory public data
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OpenNeuro
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