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37 results for “quartzite”
FIGURES 1–3 in Eukoenenia ibitipoca: the first troglobitic Palpigradi (Arachnida) from a quartzitic cave
FIGURES 1–3. Eukoenenia ibitipoca sp. nov. 1, frontal organ, holotype (scale bar 10 μm); 2, proximal setae (p1–p6) on basal segment of chelicera, paratype male (scale bar 20 μm); 3, labrum and chelicerae with distal setae (d1–d3) on basal segment, paratype female (scale bar 50 μm).
Figure 3 from: Souza Silva M, Iniesta LFM, Ferreira RL (2020) Invertebrates diversity in mountain Neotropical quartzite caves: which factors can influence the composition, richness, and distribution of the cave communities? Subterranean Biology 33: 23-43. https://doi.org/10.3897/subtbiol.33.46444
Figure 3 Obligate cave species found in the Ibitipoca Estadual Park, Brazil. AHypogastruridaeBBlattodeaCBrasilomma enigmatica (Prodidomidae) DProjapygidaeEEukoenenia ibitipoca (Palpigradi).
Figure 2 from: Souza Silva M, Iniesta LFM, Ferreira RL (2020) Invertebrates diversity in mountain Neotropical quartzite caves: which factors can influence the composition, richness, and distribution of the cave communities? Subterranean Biology 33: 23-43. https://doi.org/10.3897/subtbiol.33.46444
Figure 2 Higher taxa invertebrate abundance, taxonomic diversity (richness) (A) and average taxonomic distinctness (Δ+) (B) in all 20 quartzite caves placed above 1200 m high in Minas Gerais (Brazil).
Figure 5 from: Souza Silva M, Iniesta LFM, Ferreira RL (2020) Invertebrates diversity in mountain Neotropical quartzite caves: which factors can influence the composition, richness, and distribution of the cave communities? Subterranean Biology 33: 23-43. https://doi.org/10.3897/subtbiol.33.46444
Figure 5 Metric multidimensional scaling (MDS) ordination plot of the 20 quartzite caves with and without a stream using bootstrap regions for group means around their centroids (triangles). Average (Av).
Figure 1 from: Souza Silva M, Iniesta LFM, Ferreira RL (2020) Invertebrates diversity in mountain Neotropical quartzite caves: which factors can influence the composition, richness, and distribution of the cave communities? Subterranean Biology 33: 23-43. https://doi.org/10.3897/subtbiol.33.46444
Figure 1 Borders of the Ibitipoca Estadual Park (A), sampled caves (white dots) and altitudinal layers (red lines 1610–1780, blue lines 1460–1600, yellow lines 1310–1450, green lines 1124–1450, black lines 950–1100 meters). Vegetation types vary from slope forest (B) to grasslands (D and C) on the top of the hills.
Figure 4 from: Souza Silva M, Iniesta LFM, Ferreira RL (2020) Invertebrates diversity in mountain Neotropical quartzite caves: which factors can influence the composition, richness, and distribution of the cave communities? Subterranean Biology 33: 23-43. https://doi.org/10.3897/subtbiol.33.46444
Figure 4 Distance-based redundancy analysis (dbRDA) showing the influences of the environmental factors on cave fauna composition in the 20 studied caves. The two axes explained nearly 55% of the variability in the fitted model and nearly 17% of the total variation in the data cloud. The first overlay shows how the first dbRDA axis is strongly related to cave sampled extension.
Figure 3 in An unusual new species of Trechona (Araneae: Mygalomorphae: Dipluridae), from quartzitic caves of the Diamantina Plateau, Minas Gerais, Brazil, with a key to the known species
Figure 3. Trechona diamantina sp. nov., female from Monte Cristo cave, Diamantina, Minas Gerais, Brazil, habitus, ventral view. Scale bar = 5 cm.
Figure 1 in An unusual new species of Trechona (Araneae: Mygalomorphae: Dipluridae), from quartzitic caves of the Diamantina Plateau, Minas Gerais, Brazil, with a key to the known species
Figure 1. Trechona diamantina sp. nov., male holotype. (a) Cephalothorax, dorsal view. (b) Abdomen, dorsal view. (c) Cephalothorax, ventral view. (d) Palpal organ, retrolateral view. (e) Same, ventral view. (f) Same, prolateral view. (g) Palpal coxa, prolateral view showing lyra. (h) Right tibia and metatarsus I, retrolateral view. (i) Right tibia and metatarsus I, ventral view, arrow pointing to retrolateral nodule. Scale bars = 1 mm.
Figure 5 in Aspects of the activity rhythm and population size of troglophilic mygalomorph spiders (Trechona sp., Dipluridae) in a quartzite cave in Minas Gerais, Brazil
Figure 5. Percentage of Trechona sp. spiders (mean of 10 observations) found active in the twilight zone during dawn and dusk. The hours in the graph corresponds to actual time, without daylight saving time (DST) correction.
Figure 3 in Aspects of the activity rhythm and population size of troglophilic mygalomorph spiders (Trechona sp., Dipluridae) in a quartzite cave in Minas Gerais, Brazil
Figure 3. Percentage of Trechona sp. spiders (mean of 10 observations) found active in the entrance zone during dawn and dusk. The hours in the graph corresponds to actual time, without daylight saving time (DST) correction.
Figure 4 in Aspects of the activity rhythm and population size of troglophilic mygalomorph spiders (Trechona sp., Dipluridae) in a quartzite cave in Minas Gerais, Brazil
Figure 4. Percentage of Trechona sp. spiders (mean of 10 observations) found active in the dark zone during dawn and dusk. The hours in the graph corresponds to actual time, without daylight saving time (DST) correction.
Figure 2 in Aspects of the activity rhythm and population size of troglophilic mygalomorph spiders (Trechona sp., Dipluridae) in a quartzite cave in Minas Gerais, Brazil
Figure 2. Trechona sp. (A) Spider on sheet-web; (B) individual of Trechona sp. at the entrance of the tubular retreat, under a stone; (C) individual of Trechona sp. female; (D) spider positioned on the sheet-web close to tubular retreat.
Figure 1 in Aspects of the activity rhythm and population size of troglophilic mygalomorph spiders (Trechona sp., Dipluridae) in a quartzite cave in Minas Gerais, Brazil
Figure 1. Monte Cristo cave, general view of the entrance zone, arrow showing the access to twilight zone.
Data from: Specialized roots of Velloziaceae weather quartzite rock while mobilizing phosphorus using carboxylates
1.Campos rupestres is an extremely phosphorus (P)‐impoverished rocky ecosystem in Brazil. Velloziaceae is an important plant family in this environment, and some species colonize exposed quartzite rock. However, we know virtually nothing about their root development and nutrient acquisition within the rock outcrops and their possible role in rock weathering and landscape formation. 2.We tested the hypothesis that Velloziaceae dissolve P from the rock, enhancing rock‐weathering. The study was carried out with two Barbacenia species (Velloziaceae) that colonize quartzite rocks. We assessed the root specializations and exudates, and determined the mineralogical composition of the rocks. 3.The quartzite rocks contained a low concentration of total P in a matrix composed predominantly of silica. Using transmission electron microscopy, we show root growth perpendicular to the rock‐bedding planes. A micro‐XRF setup at the XRF beamline of a synchrotron evidenced root‐associated rock dissolution. 4.The investigated roots show novel morphological and physiological specializations, coined vellozioid roots, which are highly effective at P acquisition. These carboxylate‐releasing roots function like others specialized roots in nutrient‐depleted soils. The rocks represent a barrier for most species, but due to their chemical and physical actions inside the rocks, vellozioid roots play a pivotal role in rock weathering, contributing to shaping the campos rupestres landscapes.
Data from: Specialized roots of Velloziaceae weather quartzite rock while mobilizing phosphorus using carboxylates
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Quartzite Mortar
A quartzite mortar from a precontact period site in Missouri. This artifact is part of an archaeology assemblage curated at the Natural History Society of Maryland. Courtesy of the Natural History Society of Maryland which has given permission for the model to be downloadable for non-commercial educational purposes. Source: Objaverse 1.0 / Sketchfab
Quartzite Hammerstone
A quartzite hammerstone recovered during the 1943 archaeological excavations along the Susquehanna River by Richard Stearns. This artifact is part of an archaeology collection curated at the Natural History Society of Maryland. Courtesy of the Natural History Society of Maryland which has given permission for the model to be downloadable for non-commercial educational purposes. Source: Objaverse 1.0 / Sketchfab
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