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139 results for “savannahs”
FIGURE 7 in Local effects of deforestation on stream fish assemblages in the Amazon-Savannah transitional area
FIGURE 7 | Distribution of functional groups related to forest cover loss in Amazonian streams, state of Mato Grosso. OS: Opportunistic strategy; ES: Equilibrium strategy. Forest cover values vary from green (more forest cover) to yellow (less forest cover).
FIGURE 1 in Local effects of deforestation on stream fish assemblages in the Amazon-Savannah transitional area
FIGURE 1 | Location of the nine streams sampled in the dry season of 2017, Tanguro Farm, state of Mato Grosso, Brazil.
Linked collectors and determiners for: Description of a new species of the genus Cnemaspis Strauch, 1887 (Reptilia: Squamata: Gekkonidae) from the Nilgala Savannah forest, Uva Province of Sri Lanka.
Natural history specimen data linked to collectors and determiners held within, "Description of a new species of the genus Cnemaspis Strauch, 1887 (Reptilia: Squamata: Gekkonidae) from the Nilgala Savannah forest, Uva Province of Sri Lanka". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/92bd3b92-5be7-419b-ad51-301d63c4b0f1">https://bionomia.net/dataset/92bd3b92-5be7-419b-ad51-301d63c4b0f1</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/92bd3b92-5be7-419b-ad51-301d63c4b0f1">https://gbif.org/dataset/92bd3b92-5be7-419b-ad51-301d63c4b0f1</a>. Formatted as a Frictionless Data package.
Figure 2 in Natural history of the marsupial Thylamys macrurus (Mammalia, Didelphidae) in fragments of savannah in southwestern Brazil
Figure 2. Abundance of males versus females, and young versus adults of the marsupial Thylamys macrurus in fragments of savannah of southwestern Brazil, during dry (April to September) and wet (October to March) seasons, 2003 and 2004.
Figure 1 in Natural history of the marsupial Thylamys macrurus (Mammalia, Didelphidae) in fragments of savannah in southwestern Brazil
Figure 1. Map showing the actual distribution of the marsupial Thylamys macrurus in Paraguay and Brazil. Point 1 refers to the range expansion of this species north- and eastward in the Brazilian Cerrado. Black (new records) and white (previous records) circles are of T. macrurus; white square is southernmost record of T. velutinus. in the western Cerrado. Localities: Brazil, Mato Grosso do Sul: 1, Inocência; 2, Dois Irmãos do Buriti; 3, 4, Aquidauana. Previous records: 5, 6, Cáceres et al. (forthcoming), Carmignotto and Monfort (2006) (Bonito); 7, Vieira (1955) (Campo Grande); 8, Carmignotto and Monfort (2006) (Bodoquena); 9, Palma and Vieira (2006) (Bonito). Paraguay: 10, Palma et al. (2002) (Concepción); 11, 12, Torres (2002) (Asunción and Sapucay). Biomes: Ce, Cerrado (savannah); Ch, humid chaco; Fe, semideciduous forest; Pa, Pantanal.
Data from: Environmental conditions and individual characteristics influence movement patterns of juvenile Passerculus sandwichensis (Savannah sparrow) throughout the post-fledging period
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Data from: Effects of age, breeding strategy, population density, and number of neighbors on territory size and shape in Savannah Sparrows
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Data from: Reduced fitness of females in a facultatively polygynous species: A 32-yr study of Savannah sparrows
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Data from: Temporal distribution of endophytic and exophytic insect guilds responds to host plant phenology in the Brazilian Savannah
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Dyadic distances in African savannah elephants as they transition from Semi-captivity to the wild in Okavango Delta, Botswana, 2021 to 2023
Data package contains a dataset of distances(m) of 15 dyads generated from GPS collar data of 6 female savannah elephants as they were being released from semi-captivity to the wild in Okavango Delta, Botswana from November 1st, 2021-November 29th,2023. The dataset is provided as part the manuscript `Dyadic distance in African savannah elephants (Loxotonda africana) increases during release from semi-captivity to the wild`.
Data from: Spatial transitions in tree cover are associated with soil hydrology, but not with grass biomass, fire frequency, or herbivore biomass in Serengeti savannahs
1. Although there is a well-known association between tree cover and soil texture in savannahs, the hydrological drivers of tree cover variation have not been systematically explored, particularly in parallel with factors such as fire, herbivory, and tree-grass interactions. The relationship between hydrological factors and tree cover is important for resolving the relative contribution of bottom-up vs. top-down factors in structuring savannah vegetation. 2. We quantified soil moisture dynamics across eight 1-km transects spanning tree cover gradients from open to woody savannah in Serengeti National Park in Tanzania using soil moisture sensors coupled with dataloggers. We mapped tree cover at two spatial scales through supervised classification of high-resolution satellite imagery. We simultaneously produced water retention curves in open and woody habitats within each transect to compare soil hydrological properties and to convert volumetric water content (θ) from dataloggers to plant-available water over the course of an annual cycle. We also quantified grass biomass at 100 locations per transect, estimated fire frequency from MODIS satellite data, and quantified herbivore occupancy with paired camera traps situated in open and woody habitats within each transect. 3. We found a positive relationship between tree cover and soil moisture drainage rate, and found that open habitats had more negative water potentials than woody habitats for a given value of θ. In contrast, we found no evidence for a consistent relationship between grass biomass or fire frequency and tree cover. We found evidence for higher browser occupancy in woody than open habitats, but no habitat effects on herbivores as a group (browsers plus grazers), suggesting that herbivory is unlikely to be the dominant factor explaining variation in tree cover. 4. Our results suggest that variation in tree cover is partly driven by hydrological (edaphic) factors unrelated to fire, herbivory, tree-grass interactions or mean annual precipitation at these spatial scales in Serengeti. We contrast our findings with previous work attributing tree cover shifts in Serengeti to precipitation gradients.
Savannah River Stemmed
This large, broad-bladed stone projectile point with a prominent square stem is known as a Savannah River Stemmed. It was found at a multi-component site (31WA2199) in eastern Wake County, NC. The point gets its name from the Savannah River which separates South Carolina and Georgia, and the Stallings Island site where this point type was first described. This artifact was used as a spear or dart point and may have been secondarily used as a knife and/or scraping tool. Savannah River points have been recovered archaeologically at several deeply buried sites, including the important Doerschuk site, where it was found stratigraphically below ceramic bearing deposits and above the Morrow Mountain and Guilford type points indicating it dates to the Late Archaic period (c. 3000-1000 BC). This artifact is made from a metavolcanic stone commonly called rhyolite and measures 7.35 cm long, 3.0 cm wide, and 1.0 cm thick. Constructed by David Cranford using 43 photos in Agisoft Metashape software. (Credit: NCDNCR/OSA) Source: Objaverse 1.0 / Sketchfab
Savannah River Stemmed (312a537)
**Savannah River Stemmed spear point** Location: Doerschuk site (31Mg22), Montgomery County, North Carolina. Period: Late Archaic (3000-1000 BC). Material: metavolcanic rock. Dimensions: length, 89.5 mm; width, 35.1 mm; thickness, 8.6 mm. Notes: Catalog no. 312a537, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Illustrated in *The Formative Cultures of the Carolina Piedmont,* by Joffre L. Coe, Transactions of the American Philosophical Society vol. 54, pt. 5, 1964, Figure 38. Model by Abigail Gancz and Steve Davis. Source: Objaverse 1.0 / Sketchfab
Savannah River Stemmed Spear Point (2101a)
**Savannah River Stemmed spear point** Location: Piedmont region of North Carolina. Exact provenience unknown. Period: Late Archaic (3000-1000 BC). Material: metavolcanic rock. Dimensions: length, 117.2 mm; width, 46.0 mm; thickness, 10.7 mm. Notes: Uncataloged specimen donated by Herbert M. Doerschuk, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Steve Davis and Stephanie Grant. Source: Objaverse 1.0 / Sketchfab
Savannah River Stemmed (312a520-1)
**Savannah River Stemmed spear point** Location: Doerschuk site (31Mg22), Montgomery County, North Carolina. Period: Late Archaic (3000-1000 BC). Material: metavolcanic rock. Dimensions: length, 72.8 mm; width, 40.5 mm; thickness, 12.4 mm. Notes: Catalog no. 312a520-1, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Illustrated in *The Formative Cultures of the Carolina Piedmont,* by Joffre L. Coe, Transactions of the American Philosophical Society vol. 54, pt. 5, 1964, Figure 37. Model by Abigail Gancz and Steve Davis. Source: Objaverse 1.0 / Sketchfab
Savannah River Stemmed (312a457)
**Savannah River Stemmed spear point** Location: Doerschuk site (31Mg22), Montgomery County, North Carolina. Period: Late Archaic (3000-1000 BC). Material: metavolcanic rock. Dimensions: length, 109.0 mm; width, 46.1 mm; thickness, 12.2 mm. Notes: Catalog no. 312a457, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Illustrated in "The Formative Cultures of the Carolina Piedmont," by Joffre L. Coe, Transactions of the American Philosophical Society vol. 54, pt. 5, 1964, Figure 37. Model by Steve Davis. Source: Objaverse 1.0 / Sketchfab
Savannah River Stemmed (301a86-1)
**Savannah River Stemmed spear point** Location: Doerschuk site (31Mg22), Montgomery County, North Carolina. Period: Late Archaic (3000-1000 BC). Material: metavolcanic rock. Dimensions: length, 85.2 mm; width, 42.2 mm; thickness, 11.5 mm. Notes: Catalog no. 301a86-1, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Illustrated in *The Formative Cultures of the Carolina Piedmont,* by Joffre L. Coe, Transactions of the American Philosophical Society vol. 54, pt. 5, 1964, Figure 37. Model by Abigail Gancz and Steve Davis. Source: Objaverse 1.0 / Sketchfab
Abandoned pastures and restored savannahs have distinct patterns of plant-soil feedback and nutrient cycling compared with native Brazilian savannahs.
<p>Around 40% of the original Brazilian savannah territory is occupied by pastures dominated by fast-growing exotic C4 grasses, which impact ecosystem nutrient cycling. The restoration of these areas depends on the re-establishment of soil processes. We assessed how restoration of abandoned pastures through direct seeding of native species and land-management practices (burning and ploughing) affect soil nutrient cycling dynamics compared to native savannahs. We compared the activity of soil enzymes related to carbon (C), nitrogen (N) and phosphorus (P) cycling, as well as soil microbial biomass and soil chemical properties, such as pH and the concentration of N, P, potassium (K) and soil organic matter, among abandoned pastures, native savannah and restored areas. Abandoned pastures had faster nutrient turnover than native savannah, dominated by slow-growing native species. This pattern was evident from the overall higher biomass-specific enzyme activity in abandoned pastures than in native savannah. Compared with native savannah, restored areas had similar levels of soil enzyme activity, but lower microbial biomass and soil organic matter. Synthesis and application: The low enzyme activity in restored areas was likely related to a reduced soil organic carbon concentration due to practices such as burning and ploughing, rather than plant-soil feedback. The lower immobilization of nutrients in microbial biomass and lower retention of nutrients in restored areas, compared with native savannah, is expected to favour the re-establishment of fast-growing exotic species. Furthermore, the modifications of soil chemical and microbial properties related to abandonment of pastures did not influence restoration outcomes, because land-management practices applied prior to direct seedling had a major impact on the soil microbial community and soil fertility. Therefore, restoration of abandoned pastures should consider a greater focus on restoring soil carbon and nutrient cycling.</p>
Data from: Passive acoustic monitoring provides reliable under-estimates of population size and longevity in wild Savannah Sparrows
<p>Many breeding birds produce conspicuous sounds, providing tremendous opportunities to study free-living birds through acoustic recordings. Traditional methods for studying population size and demographic features depend on labour-intensive field research. Passive acoustic monitoring provides an alternative method for quantifying population size and demographic parameters, but this approach requires careful validation. To determine the accuracy of passive acoustic monitoring for estimating population size and demographic parameters, we used autonomous recorders to sample an island-living population of Savannah Sparrows (<em>Passerculus sandwichensis</em>) over a six-year period. Using the individually distinctive songs of males, we estimated male population size as the number of unique songs detected in the recordings. We analyzed songs across six years to estimate birth year, death year, and longevity. We then compared the estimates to field data in a blind analysis. Estimates of male population size through passive acoustic monitoring were, on average, 72% of the true male population size, with higher accuracy in lower-density years. Estimates of demographic rates were lower than true values by 29% for birth year, 23% for death year, and 29% for longevity. This is the first investigation to estimate longevity with passive acoustic monitoring, and adds to a growing number of studies that have used passive acoustic monitoring to estimate population size. Although passive acoustic monitoring under-estimated true population parametersfeatures, likely due to the high similarity among many male songs, our findings suggest that autonomous recorders can provide reliable estimates of population size and demographic characteristicslongevity in a wild songbird.</p>
Savannah River Spear Point
Savannah River style spear point 3D scanned with a Creaform GoSCAN SPARK using the capture texture capability Source: Objaverse 1.0 / Sketchfab
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Allen Brain Atlas
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