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111 results for “Late Quaternary”
FIGURE 61 in Late Quaternary Chrysophycean stomatocysts in a Southern Carpathian mountain lake, including the description of new forms (Romania)
FIGURE 61. The relative abundances of some siliceous fossils in Lake Gales, and the ratio of cysts and diatoms.
FIGURES 41–60 in Late Quaternary Chrysophycean stomatocysts in a Southern Carpathian mountain lake, including the description of new forms (Romania)
FIGURES 41–60 The most characteristic stomatocysts of Lake Gales according to their occurrences in the upper five diatom assemblages' zones (between DAZ–6 and DAZ–10). Figs 41–44 DAZ–6: Fig. 41. C072—180 cm; Fig. 42. C050 —180 cm; Fig. 43. C072—180 cm; Fig. 44. C166—180 cm; Figs 45–48 DAZ–7: Fig. 45. C001—168 cm; Fig. 46. C198—168 cm; Fig. 47. C148—168 cm; Fig. 48. C337– 176 cm; Figs 49–52 DAZ–8 Fig. 49. C057– 104 cm; Fig. 50. C324—168 cm; Fig. 51. C004—88 cm; Fig. 52. C180—104 cm; Figs 53–56 DAZ–9: Fig. 53. C133—48 cm; Fig. 54. C220—56 cm; Fig. 55. C092—168 cm; Fig. 56. C357—48 cm; Figs 57–60 DAZ–10: Fig. 57. C336—2 cm; Fig. 58. C035—2 cm; Fig. 59. C243—2 cm; Fig. 60. C345—2 cm.
FIGURES 21–40 in Late Quaternary Chrysophycean stomatocysts in a Southern Carpathian mountain lake, including the description of new forms (Romania)
FIGURES 21–40 The most characteristic stomatocysts of Lake Gales according to their occurrences in the first five diatom assemblages' zones (between DAZ–1 and DAZ–5). Figs 21–24 DAZ–1: Fig. 21. C116—264 cm, Fig. 22. C049—264 cm; Fig. 23. C189—264 cm; Fig. 24; C300B—264 cm; Figs 25–29 DAZ–2: Fig 25. C210—260 cm; Fig. 26. C169—260 cm, Fig. 27. C135—260 cm; Fig. 28. "Unidentified stomatocyst 14"—260 cm; Fig. 29. C079—260 cm; Figs 30–33, DAZ–3: Fig. 30. C189—236 cm, Fig. 31. C318—236 cm; Figs 32–33 C360—236 cm; Figs 34–37 DAZ–4: Fig. 34. C120—196 cm; Fig. 35. C202—196 cm; Fig. 36. C239—196 cm; Fig. 37. C148 note the short, thin spines that are roughly equidistant—196 cm; Figs 38–40 DAZ–5: Fig. 38. C121—188 cm, Fig. 39. C169—188 cm; Fig. 40. C009—188 cm.
FIGURE 20 in Late Quaternary Chrysophycean stomatocysts in a Southern Carpathian mountain lake, including the description of new forms (Romania)
FIGURE 20. Relative abundances and zonation of the most common diatoms in Lake Gales. Diatoms were ordered according to their occurrences.
FIGURES 1–19 in Late Quaternary Chrysophycean stomatocysts in a Southern Carpathian mountain lake, including the description of new forms (Romania)
FIGURES 1–19 Scanning electron and light microscope pictures of new morphotypes were found in Lake Gales sediment core (Gales–3) Figs 1–7 Scanning electron microscope Figs 8–19. Light microscope Figs 1, 8–9 C500; Figs 2, 10–11 C501; Figs 3, 12–13 C502; Figs 4, 14–15 C503; Figs 5, 16 C504; Figs 6, 17–18 C505; Figs 7, 19 C506. Scale bar is 10 µm in LM pictures.
Data from: The sensitivity of Neotoma to climate change and biodiversity loss over the late Quaternary
<p>The late Quaternary was a time of considerable environmental change in North America. Not only was climate highly variable, but a megafaunal extinction at the terminal Pleistocene led to considerable loss of biodiversity. These combined perturbations likely had cascading effects across communities and ecosystems. Here, we focus on a detailed fossil record on the Edwards Plateau in Texas and the response of <em>Neotoma</em>, a genus of herbivorous rodents, to these environmental and ecological perturbations. We characterized changes in <em>Neotoma</em> body mass and diet across the past 20,000 years; body mass was estimated using measurements of fossil teeth and diet quantified using stable isotope analysis of carbon and nitrogen isotope from fossil bone collagen. We found that prior to ~7,000 cal yr BP, maximum mass was positively and significantly correlated to precipitation and negatively correlated to temperature. Independently, body mass was significantly and negatively correlated to communtiy composition becoming more similar to modern over time. Moreover, while <em>Neotoma</em> diet in the Pleistocene was primarily sourced from C<sub>3</sub> resources, it became progressively more reliant on C<sub>4</sub> (and potentially CAM) plants through the Holocene. The combination of decreasing population body mass and higher C<sub>4</sub>/CAM consumption was associated with a regional transition from a mesic forest to a xeric savanna grassland. Our results suggest that <em>Neotoma</em> during the terminal Pleistocene were responding to climatic factors through changes in body size, while changes in local resource availability during the Holocene likely led to changes in the relative abundance of different <em>Neotoma</em> species in the community. </p>
Late-Quaternary megafauna extinctions have strongly reduced mammalian vegetation consumption
<p>Scrips and data for recreating the results and figures in the paper Late-Quaternary megafauna extinctions have strongly reduced mammalian vegetation consumption<br> DOI: 10.1111/geb.13723<br> Journal Global Ecology and Biogeography:<br> <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/geb.13723">https://onlinelibrary.wiley.com/doi/full/10.1111/geb.13723</a></p> <p>The three folders work as stand alone R-Studio projects, for estimating metabolic rates, densities, and the finally calculating total carbon consumption and creating summary statistics and figures. They require PHYLACINE v. 1.2.1 (https://zenodo.org/record/3690867) to be in another folder next to them.</p>
Regionally divergent drivers of historical diversification in the late Quaternary in a widely distributed generalist species, the common pheasant Phasianus colchicus
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Data from: The sensitivity of Neotoma to climate change and biodiversity loss over the late Quaternary
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Data from: Environmental correlates of the Late Quaternary regional extinctions of large and small Palaearctic mammals
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Data from: Climate warming and humans played different roles in triggering Late Quaternary extinctions in east and west Eurasia
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Data from: Late Quaternary environmental and human impacts on the mitochondrial DNA diversity of four commensal rodents in Myanmar
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Data from: Plant controls on Late Quaternary whole ecosystem structure and function
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Data from: The influence of Late Quaternary climate-change velocity on species endemism
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Data from: Community assembly and climate mismatch in Late-Quaternary eastern North American pollen assemblages
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Data from: Homogenisation of carnivorous mammal ensembles caused by global range reductions of large-bodied hypercarnivores during the late Quaternary
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Data from: Reintroducing extirpated herbivores could partially reverse the late Quaternary decline of large and grazing species
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Data from: Influence of late Quaternary climate change on present patterns of genetic variation in valley oak, Quercus lobata Née
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Data for Body mass-related changes in mammal community assembly patterns during the late Quaternary of North America
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Data from: Late Quaternary deep-sea ostracode taxonomy of the eastern North Atlantic Ocean
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