Top 10 Biorxiv Papers Today in Paleontology


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#1. A biologically driven directional change in susceptibility to global-scale glaciation during the Precambrian-Cambrian transition
Richard Boyle, Carolin Loscher
Integrated geological evidence suggests that grounded ice sheets occurred at sea level across all latitudes during two intervals within the Neoproterozoic era; the snowball Earth (SBE) events. Glacial events at ~730 and ~650 million years ago (Ma) were probably followed by a less severe but nonetheless global-scale glaciation at ~580Ma, immediately preceding the proliferation of the first fossils exhibiting unambiguous animal-like form. Existing modelling identifies weathering-induced CO2-drawdown as a critical aspect of glacial inception, but ultimately attributes the SBE phenomenon to unusual tectonic boundary conditions. Here we suggest that the evident directional decrease in Earths susceptibility to a SBE suggests that such a-directional abiotic factors are an insufficient explanation for the lack of SBE events since ~580 Ma. Instead we hypothesize that the terrestrial biospheres capacity to sustain a given level of biotic weathering-enhancement under suboptimal/declining temperatures, itself decreased over time: because...
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biorxivpreprint: A biologically driven directional change in susceptibility to global-scale glaciation during the Precambrian-Cambrian transition https://t.co/LxXUhp4Uhi #bioRxiv
paleorxiv: New preprint! A biologically driven directional change in susceptibility to global-scale glaciation during the Precambrian-Cambrian transition https://t.co/NIkK5V2Ddg HT @biorxiv
PLOSPaleo: A biologically driven directional change in susceptibility to global-scale glaciation during the Precambrian-Cambrian transition https://t.co/UMo8DgUE7P
scupper: https://t.co/VxjhZoG26f
carolinloescher: A biologically driven directional change in susceptibility to global-scale glaciation during the Precambrian-Cambrian transition https://t.co/A148fwTVYy
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Authors: 2
Total Words: 8353
Unqiue Words: 2884

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#2. A Reassessment of the Taxonomic Position of Mesosaurs Based on Two Data Matrices
Michel Laurin, Graciela Pineiro
The Early Permian mesosaurs are the oldest known primarily aquatic amniotes. Despite the interest that they have generated over time, their affinities remain controversial. Recently, two hypotheses have been supported, in which mesosaurs are either the sister-group of all other sauropsids, or the sister-group of other parareptiles. We recently upheld the former hypothesis, but in the latest study on mesosaur affinities, MacDougall et al. published a study highly critical of our work, while upholding the hypothesis that mesosaurs are basal parareptiles. We expect that the debate about mesosaur affinities will continue in the foreseeable future, but we wish to respond to the two central comments published by MacDougall et al. in 2018, who argue that variability in the temporal fenestration of early sauropsids, combined with the omission of several recently-described parareptile taxa, explain the differences in topologies between their study and ours. Reanalyzing our data matrix and theirs without characters linked with temporal...
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biorxivpreprint: A Reassessment of the Taxonomic Position of Mesosaurs Based on Two Data Matrices https://t.co/IAD2usNlJW #bioRxiv
Protohedgehog: Great to see palaeontologists increasingly using preprints to accelerate scientific discourse. Remember though that @paleorxiv offers you more flexibility in article types, formats, and data storage. And is open source. https://t.co/4p5xUKX88r
BG_Grace: A Reassessment of the Taxonomic Position of Mesosaurs Based on Two Data Matrices (OA) - v @biorxivpreprint https://t.co/8Vdilibv7a
PLOSPaleo: A Reassessment of the Taxonomic Position of Mesosaurs Based on Two Data Matrices https://t.co/de5ct4Xsyn
jovepaleontoleg: RT @PLOSPaleo: A Reassessment of the Taxonomic Position of Mesosaurs Based on Two Data Matrices https://t.co/de5ct4Xsyn
MarcosEcoRI: RT @PLOSPaleo: A Reassessment of the Taxonomic Position of Mesosaurs Based on Two Data Matrices https://t.co/de5ct4Xsyn
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Authors: 2
Total Words: 8180
Unqiue Words: 2903

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#3. What do ossification sequences tell us about the origin of extant amphibians?
Michel Laurin, David Marjanovic, Oceane Lapauze
The controversial origin of extant amphibians has been studied using several sources of data and methods, including phylogenetic analyses of morphological data, molecular dating, stratigraphic data, and comparisons of ossification sequences. A consensus has failed to emerge, perhaps because the diversity of methods used hampers comparisons. We have compiled a dataset of ossification sequences of 102 terminal taxa and seven cranial bones to assess the relative support for six competing hypotheses about the origin of extant amphibians: a monophyletic origin among temnospondyls, a monophyletic origin among lepospondyls, a diphyletic origin among both temnospondyls and lepospondyls, a diphyletic origin among temnospondyls alone, and two variants of a triphyletic origin, in which anurans and urodeles come from different temnospondyl taxa while caecilians come from lepospondyls and are either closer to anurans and urodeles or to amniotes. The data are analyzed through maximum likelihood, and the AICc (corrected Akaike Information...
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BG_Grace: What do ossification sequences tell us about the origin of extant amphibians? (OA) - v @biorxivpreprint https://t.co/mAV91cMXoW
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Authors: 3
Total Words: 9723
Unqiue Words: 3570

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#4. New Evidence of the Earliest Domestic Dogs in the Americas
Angela Perri, Chris Widga, Dennis Lawler, Terrance Martin, Thomas Loebel, Kenneth Farnsworth, Luci Kohn, Brent Buenger
The domestication of dogs probably occurred in Eurasia by 16,000 years ago, with the initial peopling of the Americas potentially happening around the same time. Dogs were long thought to have accompanied the first migrations into the Americas, but conclusive evidence for Paleoindian dogs is lacking. The direct dating of two dogs from the Koster site (Greene Co., Illinois) and a newly-described dog from the Stilwell II site (Pike Co., Illinois) to between 10,190-9,630 cal BP represents the earliest evidence of domestic dogs in the Americas and individual dog burials in worldwide archaeological record. The over 4,500 year discrepancy between the timing of initial human migration into the Americas and the earliest evidence for domesticated dogs suggests either earlier dogs are going unseen or unidentified or dogs arrived later with a subsequent human migration.
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ewencallaway: Can scientists restrict citation of a @biorxivpreprint? cc @cshperspectives @JohnRInglis https://t.co/C92uFYmdQ8 https://t.co/G6VrVRS27M
paleorxiv: New preprint: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/EO79i2lQUt HT @biorxivpreprint
amwkim: 3 animals 10.2-9.6 cal kaBP at 2 Illinois sites = “earliest evidence of domestic dogs in the Americas” – “either earlier dogs are going unseen or unidentified or dogs arrived later with a subsequent human migration”, not alongside the very first Americans https://t.co/cJ6vkOpRt7
cegAmorim: New Evidence of the Earliest Domestic #Dogs in the Americas https://t.co/nlk7MkjTHv @biorxivpreprint #aDNA
JakobSedig: Cool! Seems like aDNA isn’t possible due to preservation though...? https://t.co/FeaFrpX4Ve
DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
PromPreprint: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/6SH8e7ppuy
razibkhan: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
hbdchick: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
nextgenseek: RT @ewencallaway: Can scientists restrict citation of a @biorxivpreprint? cc @cshperspectives @JohnRInglis https://t.co/C92uFYmdQ8 https://…
AMCELL: RT @TimDoherty_: New Evidence of the Earliest Domestic Dogs in the Americas 🐕🐶https://t.co/w9lOF00VsN
AlonKeinan: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
SEASolicitorCJS: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
cegAmorim: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
cegAmorim: RT @ewencallaway: Can scientists restrict citation of a @biorxivpreprint? cc @cshperspectives @JohnRInglis https://t.co/C92uFYmdQ8 https://…
KidinaSandbox: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
colinmbrand: RT @cegAmorim: New Evidence of the Earliest Domestic #Dogs in the Americas https://t.co/nlk7MkjTHv @biorxivpreprint #aDNA
chfloudas: RT @ewencallaway: Can scientists restrict citation of a @biorxivpreprint? cc @cshperspectives @JohnRInglis https://t.co/C92uFYmdQ8 https://…
JDumey: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
stephanecastel: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
CynoAnarchist: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
diachronist: RT @DNATimeTravel: New Evidence of the Earliest Domestic Dogs in the Americas https://t.co/BtdkATQBiD
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Authors: 8
Total Words: 17179
Unqiue Words: 5465

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#5. The ecomorphology of southern African rodent incisors: Potential applications to the hominin fossil record
Oliver Paine, Jennifer N. Leichliter, Nico Avenant, Daryl Codron, Austin Lawrence, Matt Sponheimer
The taxonomic identification of mammalian fauna within fossil assemblages is a well-established component of paleoenvironmental reconstructions. However, many fragmentary specimens recovered from fossil sites are often disregarded as they can be difficult to identify with the precision required for taxonomic methods. For this reason, the large numbers of isolated rodent incisors that are often recovered from hominin fossil bearing sites have generally been seen as offering little interpretive value. Ecomorphological analysis, often referred to as a “taxon-free” method, can potentially circumvent this problem by focusing on the adaptive, rather than the taxonomic significance of rodent incisor morphology. Here, we determine if the morphology of the upper incisors of modern southern African rodents reflects dietary behavior using discriminant function analysis. Our model suggests that a strong ecomorphological signal exists in our modern sample and we apply these results to two samples of isolated incisors from the hominin fossil...
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Anthro_Austin: We have a new pre-print out on bioRxiv from work led by Oliver Paine, Jennifer Leichliter, and @homininisotope: The ecomorphology of southern African rodent incisors: Potential applications to the hominin fossil record https://t.co/4vGrASgYKA
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Authors: 6
Total Words: 6847
Unqiue Words: 2693

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#6. Reversing Time Averaging and Reconstructing Extinction Rates with Approaches from Image Processing
Niklas Hohmann
In this paper, the relation between the extinction rate and the rate of last fossil occurrences as well as the relation between the fossil occurrence rate and the time averaged fossil occurrence rate is examined. Both relations are described by the same mathematical operation. This operation is commonly used in image processing, where it generates a blurring effect. Therefore the rate of last fossil occurrences can be taken as a blurred version of the extinction rate, and the time averaged fossil occurrence rate as a blurred version of the fossil occurrence rate. This connection has different applications. It allows to study the patterns different types of time averaging generate or the patterns of last fossil occurrences generated by different extinction rates. More importantly, it opens the possibility to use algorithms from image processing that reverse blurring effects for geological applications. This can be used to reverse the effects of time averaging or to reconstruct extinction rates from the rate of last fossil occurrences.
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paleorxiv: New preprint: Reversing Time Averaging and Reconstructing Extinction Rates with Approaches from Image Processing https://t.co/gyjIL5LsYX HT @biorxivpreprint
Emiliagnathus: We're working on social media-fu so this time #MathClickBait 😆 A convoluted mystery: The hidden link between Photoshop and mass extinctions unveiled https://t.co/O0j1zRnwQO https://t.co/76f5oNlqU2
Emiliagnathus: Another #StratigraphicPaleobiology work from @FAU_Germany mathematician-turned-paleobiologist student: Reversing Time Averaging and Reconstructing Extinction Rates with Approaches from Image Processing https://t.co/O0j1zRnwQO
PLOSPaleo: Reversing Time Averaging and Reconstructing Extinction Rates with Approaches from Image Processing https://t.co/p75F9XP5Ok
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Authors: 1
Total Words: 4104
Unqiue Words: 1061

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#7. Surface sediment samples from early age of seafloor exploration can provide a late 19th century baseline of the marine environment
Marina Costa Rillo, Michal Kucera, Thomas H. G. Ezard, Giles Miller
Historical seafloor samples collected up to 150 years ago represent an important archive to benchmark the extent of current ocean acidification and pollution trends. Such benchmarking requires that the historical sediment samples represent the state of the environment at- or shortly before the time of collection. However, early oceanographic expeditions sampled the ocean floor using devices like the sounding tube or a dredge, which potentially disturb the sediment surface and recover a mix of Holocene (surface) and Pleistocene sediments. Here we use climate-sensitive microfossils as a fast and efficient biometric method to assess to what degree historical seafloor samples contain a mixture of modern and glacial sediments. Our assessment is based on comparing the composition of planktonic foraminifera (PF) assemblages in historical samples with Holocene and Last Glacial Maximum (LGM) global reference datasets. We show that eight out of the nine historical samples contain PF assemblages more similar to the Holocene than to the LGM...
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biorxivpreprint: Surface sediment samples from early age of seafloor exploration can provide a late 19th century baseline of the marine environment https://t.co/dnr1K0n3M0 #bioRxiv
PLOSPaleo: Surface sediment samples from early age of seafloor exploration can provide a late 19th century baseline of the marine environment https://t.co/OtgV0BFz5x
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Authors: 4
Total Words: 4175
Unqiue Words: 1805

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#8. The multi-peak adaptive landscape of crocodylomorph body size evolution
Pedro L Godoy, Roger B J Benson, Mario Bronzati, Richard J Butler
Background: Little is known about the long-term patterns of body size evolution in Crocodylomorpha, the > 200-million-year-old group that includes living crocodylians and their extinct relatives. Extant crocodylians include 24 species and span a narrow range of phenotypes, being mostly large-bodied (3-7 m) semi-aquatic predators. However, extinct crocodylomorphs exhibit a wider range of phenotypes, and many of the earliest taxa were much smaller (< 1.2 m). This suggests a pattern of size increase during the evolutionary history of Crocodylomorpha. Furthermore, the influence of abiotic and biotic factors on crocodylomorph body size evolution is currently poorly understood. In this study, we quantify patterns of body size disparity through the evolutionary history of crocodylomorphs. We use phylogenetic comparative methods to characterise the macroevolutionary patterns that gave rise to this disparity, and to quantitatively test hypotheses of abiotic (i.e., palaeotemperature and palaeolatitude) and intrinsic (habitat) factors as...
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ButlerLabBham: You can read Pedro's thesis work on heterochrony here: https://t.co/ZTjI7D0uVg And his work on body size evolution is available as a preprint here: https://t.co/lVQyhM5REU
ButlerLabBham: Preprint on crocodilian body size evolution now available at @biorxivpreprint. Work is second chapter of PhD thesis of @PedroLGodoy at @Palaeo_Bham in collaboration with Mario Bronzati &amp; @BensonLabOxford: https://t.co/lVQyhM5REU https://t.co/G8JsiGJjuS
paleorxiv: New preprint: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/YYbaqxxCnh via @biorxiv
fsantini2015: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/lcjgVeLN9J https://t.co/Uuilne57xq
TomHoltzPaleo: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/PNp8Z8PE56
PLOSPaleo: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/AHZBZmPcfu
ferwen: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/EfLJ7lNDb8
PromPreprint: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/wvZWbjLMWw
juvelas: RT @TomHoltzPaleo: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/PNp8Z8PE56
DinoElisabeth: RT @PLOSPaleo: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/AHZBZmPcfu
danielmartinsuk: RT @PromPreprint: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/wvZWbjLMWw
Kuzco297: RT @PLOSPaleo: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/AHZBZmPcfu
EmuLarge: RT @fsantini2015: The multi-peak adaptive landscape of crocodylomorph body size evolution https://t.co/lcjgVeLN9J https://t.co/Uuilne57xq
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Total Words: 24145
Unqiue Words: 6961

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#9. New cheloniellid arthropod with large raptorial appendages from the Silurian of Wisconsin, USA
Andrew James Wendruff, Loren Babcock, Donald Mikulic, Joanne Kluessendorf
Cheloniellids comprise a small, distinctive group of Paleozoic arthropods of whose phylogenetic relationships within the Arthropoda remain unresolved. A new form, Latromirus tridens, n. gen, n. sp. is reported from the Waukesha Lagerstatte in the Brandon Bridge Formation (Silurian: Telychian), near Waukesha, Wisconsin, USA. Exceptionally preserved specimens show previously poorly known features including biramous appendages; this is the first cheloniellid to show large, anterior raptorial appendages. We emend the diagnosis of Cheloniellida; cephalic appendages are uniramous and may include raptorial appendages; trunk appendages are biramous.
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biorxivpreprint: New cheloniellid arthropod with large raptorial appendages from the Silurian of Wisconsin, USA https://t.co/f2thEcCUoI #bioRxiv
paleorxiv: Another preprint in biorXiv that names a new fossil genus and species. https://t.co/IBukxCfi4T What if this gets changed during peer review? This is why we have explicit submission guidelines that ask authors to redact new names. https://t.co/bI7VD1YNru
paleorxiv: Another new genus and species named in a preprint here https://t.co/SVPdMugsO8 This is something we have a specific policy at @paleorxiv to avoid, in case things change during peer review https://t.co/bI7VD1YNru
Protohedgehog: RT @paleorxiv: Another preprint in biorXiv that names a new fossil genus and species. https://t.co/IBukxCfi4T What if this gets changed du…
PLOSPaleo: RT @paleorxiv: Another new genus and species named in a preprint here https://t.co/SVPdMugsO8 This is something we have a specific policy…
nickschurch: RT @paleorxiv: Another preprint in biorXiv that names a new fossil genus and species. https://t.co/IBukxCfi4T What if this gets changed du…
paleoadiel: RT @paleorxiv: Another new genus and species named in a preprint here https://t.co/SVPdMugsO8 This is something we have a specific policy…
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Authors: 4
Total Words: 5726
Unqiue Words: 2258

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#10. Palaeobiological inferences based on long bone epiphyseal and diaphyseal structure - the forelimb of xenarthrans (Mammalia)
Eli Amson, John A. Nyakatura
Trabecular architecture (i.e., the main orientation of the bone trabeculae, their number, mean thickness, spacing, etc.) has been shown experimentally to adapt with extreme accuracy and sensitivity to the loadings applied to the bone during life. However, the potential of trabecular parameters used as a proxy for the mechanical environment of an organism's organ to help reconstruct the lifestyle of extinct taxa has only recently started to be exploited. Furthermore, these parameters are rarely combined to the long-used mid-diaphyseal parameters to inform such reconstructions. Here we investigate xenarthrans, for which functional and ecological reconstructions of extinct forms are particularly important in order to inform our macroevolutionary understanding of their main constitutive clades, i.e., the Tardigrada (sloths), Vermilingua (anteaters), and Cingulata (armadillos and extinct close relatives). The lifestyles of modern xenarthrans can be classified as fully terrestrial and highly fossorial (armadillos), arboreal (partly to...
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paleorxiv: New preprint: Palaeobiological inferences based on long bone epiphyseal and diaphyseal structure - the forelimb of xenarthrans (Mammalia) https://t.co/TndpjOpObO via @biorxiv_pubd
PCI_Paleo: 🔥 New #preprint peer-reviewed by @PCI_Paleo 🔥 Amson &amp; Nyakatura (2018). Palaeobiological inferences based on long bone epiphyseal and diaphyseal structure - the forelimb of xenarthrans (Mammalia) https://t.co/Nc0sCGgNDt @biorxivpreprint #openscience #peerreview https://t.co/Biho5SFSLS
TomHoltzPaleo: Palaeobiological inferences based on long bone epiphyseal and diaphyseal structure - the forelimb of xenarthrans (Mammalia) https://t.co/FgsAMPtFB3
PLOSPaleo: Palaeobiological inferences based on long bone epiphyseal and diaphyseal structure - the forelimb of xenarthrans (Mammalia) https://t.co/nN012YVtu8
Colecionadores2: Palaeobiological inferences based on long bone epiphyseal and diaphyseal structure - the forelimb of xenarthrans (Mammalia) https://t.co/PR796wr7mA
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Total Words: 14180
Unqiue Words: 5127

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