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139 results for “savannahs”
Biological and Physical Monitoring Data of Restored Oyster Reef in Savannah River, Savannah, GA from May 2023 - February 2025
For the purposes of this study, we constructed two oyster reefs in Savannah, GA, USA using standard spat-on-shell restoration methodology. Reefs were constructed 1-2 meters from the marsh edge to reduce wave energy as it approached the shoreline, similar to a breakwater. We then conducted monitoring on the biological function of the reef, including live juvenile oyster coverage, size, and abundance for approximately 18 months. We also quantified the energy flux of waves offshore and onshore of the reef using water pressure measurements to determine the capability of these reefs at reducing wave energy. The oyster reefs in this study decreased wave energy by up to 40% compared to paired, non-reef control sites. Constructed oyster reefs also experienced healthy oyster population growth throughout the study, with live juvenile coverage of 17-40% almost 18 months post-deployment. This study took place in an erosion-prone area due to recreational and commercial boating traffic at the nearby Port of Savannah. Our results indicate that using restored oyster reefs as living shorelines is a technique with high potential for preventing shoreline loss in coastal areas vulnerable to anthropogenically-caused erosion. Restored Reef Site 1: 32.067957°, -80.985005° Control Site 1: 32.0675194°, -80.986369° Restored Reef Site 2: 32.062663°, -80.965147° Control Site 2: 32.063261°, -80.965889°
Figure 3 in Aspects of natural history in a sand boa, Eryx muelleri (Erycidae) from arid savannahs in Burkina Faso, Togo, and Nigeria (West Africa)
Figure 3. Relationships between (a) Snout-Vent-Length (SLV) and Tail Length (TL), and between (b) SVL and Head Length (HL) in Eryx muelleri. Specimens from Togo, Burkina Faso and Nigeria were pooled.
Figure 1 in Aspects of natural history in a sand boa, Eryx muelleri (Erycidae) from arid savannahs in Burkina Faso, Togo, and Nigeria (West Africa)
Figure 1. (a) Eryx muelleri from Kebbe, north-western Nigeria (Photo: Luca Luiselli); (b) dry savannah habitat of Eryx muelleri in northern Burkina Faso (Photo: Emmanuel Hema).
Figure 2 in Food niche of Exomalopsis (Exomalopsis) fulvofasciata Smith (Hymenoptera: Apidae) in Brazilian savannah: the importance of oil-producing plant species as pollen sources
Figure 2. Estimated number of pollen types in each study area using extrapolation curves. ESP: Ecological Station of Panga, MG and SPSCN: State Park of Serra de Caldas Novas, GO.
Data from: Effects of age, breeding strategy, population density, and number of neighbors on territory size and shape in Savannah Sparrows
<p>The size and shape of an animal's breeding territory are dynamic features influenced by multiple intrinsic and extrinsic factors and can have important implications for survival and reproduction. Quantitative studies of variation in these territory features can generate deeper insights into animal ecology and behavior. We explored the effect of age, breeding strategy, population density, and number of neighbors on the size and shape of breeding territories in an island population of Savannah Sparrows (<em>Passerculus sandwichensis</em>). Our dataset consisted of 407 breeding territories belonging to 225 males sampled over 11 years. We compared territory sizes to the age of the male territorial holder, the male's reproductive strategy (monogamy vs. polygyny), the number of birds in the study population (population density), and the number of immediate territorial neighbors (local density). We found substantial variation in territory size, with territories ranging over two orders of magnitude from 57 to 5727 m2 (0.0057 to 0.57 ha). Older males had larger territories, polygynous males had larger territories, territories were smaller in years with higher population density, and larger territories were associated with more immediate territorial neighbors. We also found substantial variation in territory shape, from near-circular to irregularly-shaped territories. Males with more neighbors had irregularly shaped territories, but the shape did not vary with male age, breeding strategy, or population density. For males that lived two years or longer, we found strong consistent individual differences in territory size across years, but weaker individual differences in territory shape, suggesting that size has high repeatability whereas shape has low repeatability. Our work provides evidence that songbird territories are highly dynamic and that their size and shape reflect both intrinsic factors (age and number of breeding partners) and extrinsic factors (population density and number of territorial neighbors).</p>
Figure 5 in Nesting evidence, density and vocalisations in a resident population of Savannah Sparrow Passerculus sandwichensis wetmorei in Guatemala
Figure 5. Sonograms of songs of four male Savannah Sparrows Passerculus sandwichensis wetmorei in PRM Todos Santos Cuchumatán, dpto. Huehuetenango, Guatemala: (a) 5 June 2016 (Knut Eisermann, XC333471), including waveform, (b) 5 June 2016 (Knut Eisermann, XC333471), (c) 3 June 2016 (Knut Eisermann, XC333472), (d) 3 June 2016 (Knut Eisermann, XC333473). DW = descendent whistle. See Table 1 for signal measurements of marked notes.
Figure 4 in Nesting evidence, density and vocalisations in a resident population of Savannah Sparrow Passerculus sandwichensis wetmorei in Guatemala
Figure 4. (1) Approximate breeding range of Savannah Sparrow Passerculus sandwichensis in Mexico (sensu Howell & Webb 1995); (2) summer records in the Sierra Los Cuchumatanes, Guatemala, including recent nesting and other summer records (June–July 2016), and historic summer records (June 1897, van Rossem 1938); and (3) summer record from Sierra Madre range in June 2002 (J. Berry in Eisermann & Avendaño 2007). Chis. = Chiapas, Mexico, GT = Guatemala, HN = Honduras, SV = El Salvador. Inset map shows location of summer records of Savannah Sparrow in the Sierra Los Cuchumatanes (SLC) and Sierra Madre (SM) ranges in Guatemala.
Figure 3 in Nesting evidence, density and vocalisations in a resident population of Savannah Sparrow Passerculus sandwichensis wetmorei in Guatemala
Figure 3. Nesting evidence of Savannah Sparrow Passerculus sandwichensis wetmorei in PRM Todos Santos Cuchumatán, dpto. Huehuetenango, Guatemala: (a) nest with a single nestling, 2 July 2016 (a second nestling was found dead 20 cm from the nest); (b) recently fledged juvenile, barely able to fly, 3 July 2016, (c–d) two fledglings well able to fly, tail c.40% grown, 3 July 2016; (e) dependent juvenile with tail c.80% grown, 3 July 2016; and (f) immature, 27 August 2016 (Knut Eisermann)
Figure 2 in Nesting evidence, density and vocalisations in a resident population of Savannah Sparrow Passerculus sandwichensis wetmorei in Guatemala
Figure 2. Different adult Savannah Sparrows Passerculus sandwichensis wetmorei of a breeding population in PRM Todos Santos Cuchumatán, dpto. Huehuetenango, Guatemala: (a) lateral; (b) dorsal, 5 June 2016; and (c) frontal view showing the neatly marked median crown-stripe, 2 July 2016 (Knut Eisermann)
Figure 1 in Nesting evidence, density and vocalisations in a resident population of Savannah Sparrow Passerculus sandwichensis wetmorei in Guatemala
Figure 1. Habitat of a breeding population of Savannah Sparrow Passerculus sandwichensis wetmorei at 3,700 m in PRM Todos Santos Cuchumatán, dpto. Huehuetenango, Guatemala, 5 June 2016; the undulating landscape, shaped by glaciers during the late Quaternary, is currently covered with grassland dominated by Muhlenbergia quadridentata (Poaceae) (Knut Eisermann)
Fig. 3 in Post-fire effect of savannah vegetation on the establishment of new colonies of Atta sexdens rubropilosa (Hymenoptera: Formicidae)
Fig. 3. Characterization of Atta sexdens rubropilosa surviving colonies in burned and unburned areas, afer 120 d of queen reclusion (female), in soils from 2 depths (0.0–10.0 cm and 10.1–20.0 cm). Means (and standard errors) followed by the same letter did not differ from each other (ANOVA, P> 0.05)
Fig. 2 in Post-fire effect of savannah vegetation on the establishment of new colonies of Atta sexdens rubropilosa (Hymenoptera: Formicidae)
Fig. 2. Characterization of Atta sexdens rubropilosa surviving colonies in burned and unburned areas, afer 120 d of queen reclusion (female). Means (and standard errors) followed by the same letter did not differ from each other (ANOVA, P> 0.05).
Fig. 1 in Post-fire effect of savannah vegetation on the establishment of new colonies of Atta sexdens rubropilosa (Hymenoptera: Formicidae)
Fig. 1. Microbial activity (mean and standard error) in soils collected at 2 depths (0.0 to 10.0 cm and 10.1 to 20.0 cm) in areas with burned and unburned vegetation in Ipameri, GO, Brazil. Means followed by the same letter (accumulated CO2 production at 10 d), for each depth where the soil was collected, did not differ from each other (Mann–Whitney U test, P> 0.05).
Figs. 5–8 in Axima nordestina (Hymenoptera, Eurytomidae), a new stalk-eyed wasp from Brazilian savannah
Figs. 5–8. Axima nordestina Barbosa, Krogmann & Azevedo sp. nov., 5. Head and mesosoma, lateral view. 6. Wings, dorsal view. 7. Metasoma, lateral view. 8. Head and mesosoma, dorsal view.
Figures 10-13 in Brown-lacewings (Insecta: Neuroptera: Hemerobiidae) from Brazilian savannah in Central Brazil
Figures 10-13. Distribution of the studied Hemerobiidae species and their occurrence records to Brazil and Neotropics. 10. Hemerobius hernandezi Monserrat and Megalomus impudicus (Gerstaecker). 11. Nomerobius argentinensis González Olazo and Nomerobius cuspidatus Oswald. 12. Notiobiella Banks. 13. Nusalala tessellata (Gerstaecker). / Distribución de las especies de Hemerobiidae estudiadas y sus registros de ocurrencia en Brasil y el Neotrópico. 10. Hemerobius hernandezi Monserrat and Megalomus impudicus (Gerstaecker). 11. Nomerobius argentinensis González Olazo and Nomerobius cuspidatus Oswald. 12. Notiobiella Banks. 13. Nusalala tessellata (Gerstaecker).
Figures 1-6 in Brown-lacewings (Insecta: Neuroptera: Hemerobiidae) from Brazilian savannah in Central Brazil
Figures 1-6. Habitus of collected species of Hemerobiidae. 1. Hemerobius hernandezi Monserrat, lateral view. 2. Megalomus impudicus (Gerstaecker), lateral view. 3. Nomerobius argentinensis González Olazo, dorsal view. 4. Nomerobius cuspidatus Oswald, lateral view. 5. Notiobiella sp., lateral view 6. Nusalala tessellata (Gerstaecker), dorsal view. Scale bar: 1 mm. / Hábitos de las especies de Hemerobiidae recolectadas. 1. Hemerobius hernandezi Monserrat, vista lateral. 2. Megalomus impudicus (Gerstaecker), vista lateral. 3. Nomerobius argentinensis González Olazo, vista dorsal. 4. Nomerobius cuspidatus Oswald, vista lateral. 5. Notiobiella sp., vista lateral. 6. Nusalala tessellata (Gerstaecker), vista dorsal. Escala: 1 mm.
FIGURE 6 in Local effects of deforestation on stream fish assemblages in the Amazon-Savannah transitional area
FIGURE 6 | Relationship between forest cover and the functional richness index observed in streams located in the Tanguro Farm, municipality of Querência, state of Mato Grosso. Forest cover is represented by the Axis I of the PCA performed with land use variables obtained from a 60 m buffer. Sites 1, 2 and 3 overlapped and were rearranged for better visualization.
FIGURE 5 in Local effects of deforestation on stream fish assemblages in the Amazon-Savannah transitional area
FIGURE 5 | Relationship between species composition and the first PCA axis, ordinated by a Principal Coordinate Analysis. Lighter colors represent sample points with less forest cover. The species corresponding to the codes are in Tab. 2.
FIGURE 4 in Local effects of deforestation on stream fish assemblages in the Amazon-Savannah transitional area
FIGURE 4 | Relationship between forest cover and the physical integrity index of streams located in the Tanguro Farm, Municipality of Querência, state of Mato Grosso. Forest cover is represented by the Axis I of the PCA performed with land use variables obtained from a 60 m buffer. Sites 1, 2 and 3 overlapped, and were rearranged for better visualization. Sgrid: Site.
FIGURE 2 in Local effects of deforestation on stream fish assemblages in the Amazon-Savannah transitional area
FIGURE 2 | Principal component analysis performed with the percentages of land use in 60 m riparian buffers in the catchment of nine streams located in the Tanguro Farm, Municipality of Querência, state of Mato GrossoT. Sites 1, 2, and 3 overlapped, and were rearranged for better visualization. Sgrid: Site.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
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The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
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