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9 results for “Sisyphus”
Zeeman-Sisyphus deceleration simulation data
<p>These .zip files are the raw simulation results presented in our paper "Principles and design of a Zeeman-Sisyphus decelerator for molecular beams", which has received preliminary acceptance by ChemPhysChem (as of August 1, 2016). </p>
FIGURE 4 in Three new Sisyphus species (Coleoptera: Scarabaeidae: Scarabaeinae) from shaded vegetation in southern Africa
FIGURE 4. Map of southern Africa showing the geographic distribution of the new species: S. umbraphilus, S. oralensis and S. neobornemisszanus.
FIGURE 3. A. S in Three new Sisyphus species (Coleoptera: Scarabaeidae: Scarabaeinae) from shaded vegetation in southern Africa
FIGURE 3. A. S. neobornessmizanus sp. nov. habitus. Diagnostic features: B. Tufts of setae on elytra. C. Aedeagus.
FIGURE 1. A. S in Three new Sisyphus species (Coleoptera: Scarabaeidae: Scarabaeinae) from shaded vegetation in southern Africa
FIGURE 1. A. S. umbraphilus sp. nov. habitus. Diagnostic characters: Bi. Lateral genal margins almost parallel. Bii. Setae absent from vertical medial line on pygidium. Biii. Tufts of setae on epipleurae. C. Aedeagus.
FIGURE 2. A. S in Three new Sisyphus species (Coleoptera: Scarabaeidae: Scarabaeinae) from shaded vegetation in southern Africa
FIGURE 2. A. S. oralensis sp. nov. habitus. Diagnostic characters: Bi. Gena rounded forming obtuse angle with genal suture. Bii. Patterned arrangement of setae on pronotal disc separated by bare patches. C. Aedeagus.
Fig. 1 in Some Traits of the Biology and Epigean Behavior of Sisyphus schaefferi (Linnaeus) (Coleoptera: Scarabaeidae: Scarabaeinae: Sisyphini)
Fig. 1. Scatter plot for live body weight as a function of body length of mating and non-mating adult Sisyphus schaefferi (n = 315) observed in La Mandria Regional Park, Italy, during 2017.
Figs. 1-2. Sisyphus schaefferi. 1 in Peeling Dung Pellets: An Unrecorded Behavior in the Roller Dung Beetle Sisyphus schaefferi Linnaeus (Coleoptera: Scarabaeidae: Sisyphini)
Figs. 1-2. Sisyphus schaefferi. 1) Beginning to raise an edge of crust by pushing it with its clypeus; 2) With the dung ball and, on the left, the abandoned crust.
Evolutionary history and eco-climatic diversification in southern African Sisyphus (Coleoptera: Scarabaeidae: Scarabaeinae)
<p><b>Aim</b>: The high diversity of species in southern Africa has been attributed to geological and palaeoclimatic factors. The timing of radiations in some groups is held to be linked to these geoclimatic trends. Using the Scarabaeinae dung beetle genus, <i>Sisyphus,</i> as a model system, we investigate how geological uplift and climatic changes in the late Cenozoic affected its diversification patterns in southern Africa.</p> <p><b>Location</b>: southern Africa.</p> <p><b>Taxon</b>: The dung beetle genus,<i> Sisyphus </i>Latreille, 1807<i> </i>(Coleoptera: Scarabaeidae: Scarabaeinae)<i>.</i></p> <p><b>Methods</b>: A dated molecular phylogeny of southern African <i>Sisyphus</i> was compared with a factor analysis of species distribution data that statistically defined groups of species according to current climatic distribution. We used these climatic clusters to estimate ancestral ranges using the 'BioGeoBEARS' R package. A lineage through time plot was calculated using the R package 'APE'. We used Bayesian diversification models (compound Poisson process on mass extinction times) to test hypotheses on how late Cenozoic uplift and climatic changes affected speciation and extinction of <i>Sisyphus</i>. Furthermore, we implemented ecological niche modelling in MaxEnt to predict the habitat suitability of species under present climatic conditions.</p> <p><b>Results</b>: Four species groups defined from factor analysis of current climatic distribution data are primarily restricted to the moist summer rainfall region in the northeast. These groups comprise 10 warm, eastern lowland species; eight eastern savannah species; five cool, eastern highland species; and just two southwestern low rainfall species. Chronology of the phylogeny suggests that species diversification occurred from the mid-Miocene until the Pleistocene, during which the central southern African plateau was uplifted in tandem with the advent of winter rainfall and arid climatic zones to the southwest. The estimation of ancestral ranges suggests that the ancestor of <i>Sisyphus</i> was centred in eastern low to mid-altitude areas. The diversification model shows no evidence of an increase in extinction rate during the late Cenozoic uplift and climatic changes. The speciation rates were constantly higher in the Miocene to Pliocene, followed by a dramatic drop in speciation rates during the transition to the Pleistocene. Modelling of habitat suitability of current species ranges supports the eastern trends in distribution patterns.</p> <p><b>Main conclusions</b>: The taxonomic and eco-climatic diversification of sisyphines is coincident with geological uplift and changes in climate in east-central southern Africa. However, phylogenetic relationships of southern African <i>Sisyphus</i> species are not homogenously distributed with respect to geography and climate.</p>
Evolutionary history and eco-climatic diversification in southern African Sisyphus (Coleoptera: Scarabaeidae: Scarabaeinae)
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