1,721,016 research outputs found
Terrestrial behavior and trackway morphology of Neotropical bats
No full textJones, Matthew F., Hasiotis, Stephen T. (2018): Terrestrial behavior and trackway morphology of Neotropical bats. Acta Chiropterologica 20 (1): 229-250, DOI: 10.3161/15081109ACC2018.20.1.018, URL: http://dx.doi.org/10.3161/15081109acc2018.20.1.01
FIG. 11 in Terrestrial behavior and trackway morphology of Neotropical bats
No full textFIG. 11. Carollia perspicillata arcuate manus tracks on Cast 1 and outlines of arcuate tracks produced by digit I of right and left manus. Scale bar 1 cmPublished as part of Jones, Matthew F. & Hasiotis, Stephen T., 2018, Terrestrial behavior and trackway morphology of Neotropical bats, pp. 229-250 in Acta Chiropterologica 20 (1) on page 240, DOI: 10.3161/15081109ACC2018.20.1.018, http://zenodo.org/record/782330
FIG. 13 in Terrestrial behavior and trackway morphology of Neotropical bats
No full textFIG. 13. Carollia perspicillata breaststrokelike crawl trackway on Cast 1 showing outlines of manus tracks; arrow indicates direction of movement. Scale bar 1 cmPublished as part of Jones, Matthew F. & Hasiotis, Stephen T., 2018, Terrestrial behavior and trackway morphology of Neotropical bats, pp. 229-250 in Acta Chiropterologica 20 (1) on page 242, DOI: 10.3161/15081109ACC2018.20.1.018, http://zenodo.org/record/782330
FIG. 12 in Terrestrial behavior and trackway morphology of Neotropical bats
No full textFIG. 12. Carollia perspicillata searching behavior trace on Cast 1 showing outlines of clustered individual pedal tracks produced by a single foot. Scale bar 1 cmPublished as part of Jones, Matthew F. & Hasiotis, Stephen T., 2018, Terrestrial behavior and trackway morphology of Neotropical bats, pp. 229-250 in Acta Chiropterologica 20 (1) on page 240, DOI: 10.3161/15081109ACC2018.20.1.018, http://zenodo.org/record/782330
FIG. 14 in Terrestrial behavior and trackway morphology of Neotropical bats
No full textFIG. 14. Micronycteris microtis cast showing outlines of manus and pes tracks lacking any discernable trackways. Scale bar 5 cmPublished as part of Jones, Matthew F. & Hasiotis, Stephen T., 2018, Terrestrial behavior and trackway morphology of Neotropical bats, pp. 229-250 in Acta Chiropterologica 20 (1) on page 243, DOI: 10.3161/15081109ACC2018.20.1.018, http://zenodo.org/record/782330
FIG. 7 in Terrestrial behavior and trackway morphology of Neotropical bats
No full textFIG. 7. Screen capture outlines of S. bilineata searching behavior: A) Initial position with feet stationary and distal to body; B–C) Bat retracts right pes then extends it distal to body; D–F) Bat plants right pes and retracts then extends left pes; G–H) Left pes planted and bat begins to retract right pes as it leans to right. Screen captures taken approximately 0.125 seconds apartPublished as part of Jones, Matthew F. & Hasiotis, Stephen T., 2018, Terrestrial behavior and trackway morphology of Neotropical bats, pp. 229-250 in Acta Chiropterologica 20 (1) on page 237, DOI: 10.3161/15081109ACC2018.20.1.018, http://zenodo.org/record/782330
Ichnotaxonomy of the Eocene Green River Formation, Soldier Summit and Spanish Fork Canyon, Uinta Basin, Utah: Interpreting behaviors, lifestyles, and erecting the Cochlichnus Ichnofacies
Full text linkThe Eocene Green River Formation in the Uinta Basin, Utah, has a diverse ichnofauna. Nineteen ichnogenera and 26 ichnospecies were identified: Acanthichnus cursorius, Alaripeda lofgreni, c.f. Aquatilavipes isp., Aulichnites (A. parkerensis and A. tsouloufeidos isp. nov.), Aviadactyla (c.f. Av. isp. and Av. vialovi), Avipeda phoenix, Cochlichnus (C. anguineus and C. plegmaeidos isp. nov.), Conichnus conichnus, Fuscinapeda texana, Glaciichnium liebegastensis, Glaroseidosichnus ign. nov. gierlowskii isp. nov., Gruipeda (G. fuenzalidae and G. gryponyx), Midorikawapeda ign. nov. semipalmatus isp. nov., Planolites montanus, Presbyorniformipes feduccii, Protovirgularia dichotoma, Sagittichnus linki, Treptichnus (T. bifurcus, T. pedum, and T. vagans), and Tsalavoutichnus ign. nov. (Ts. ericksonii isp. nov. and Ts. leptomonopati isp. nov.). Four ichnocoenoses are represented by the ichnofossils—Cochlichnus, Conichnus, Presbyorniformipes, and Treptichnus—representing dwelling, feeding, grazing, locomotion, predation, pupation, and resting behaviors of organisms in environments at and around the sediment-water-air interface. A new Cochlichnus Ichnofacies is established to represent continental assemblages of traces produced in environmental conditions at and around the sediment-water-air interface. The Cochlichnus Ichnofacies can be identified in deposits from as old as the Carboniferous. The Cochlichnus Ichnofacies replaces the Shorebird Ichnofacies and usage of the Mermia Ichnofacies for ephemeral water bodies, and restricts the Mermia Ichnofacies to traces in deeper, perennial water bodies. A new ichnospecies of Aulichnites is proposed, A. tsouloufeidos. Three new ichnogenera with four ichnospecies are established: Glaroseidosichnus gierlowskii, Midorikawapeda semipalmatus, and Tsalavoutichnus (Ts. ericksonii, Ts. leptomonopati). This is the first detailed ichnotaxonomic study of the Soldier Summit and Spanish Fork Canyon localities of the Eocene Green River Formation
Microtubules in hyaloclasts from the Hawaii Scientific Drilling Project #2 phase 1 core, Hilo, Hawaii: evidence of microbe-rock interactions
Full text linkMinute tubules etched into basalt glass in hyaloclastites from the Hawaii Scientific Drilling Project #2 (HSDP) phase 1 borehole are interpreted as trace fossils formed by microbes, i.e. microendolithic borings. Such borings are one to a few micrometers in diameter and up to >100 µm long; they extend into glass shards from free surfaces (broken shards, vesicles, fractures). Morphologic characterization of microendolithic borings quantitatively describes them for comparison with other occurrences and aids in understanding the interactions between microorganisms and basaltic glass that result in the dissolution of the glass. The first step in working with these features as trace fossils was to modify the ichnofabric index of Droser and Bottjer (1986) for use with minute features that extend into homogeneous material. The modification includes six semiquantitative classes of disruption and is scale-independent, applicable to any size feature. The second step was to apply the new microendolithic ichnofabric index (MII) to the HSDP samples. Analysis of the HSDP samples using the MII showed that the abundance of bioerosion varied throughout the core. Assigned MII values ranged from 1 to 3, average MII values ranged from 1 to 2.44, while the mean MII value of 1.2. Areas with the most bioerosion were located between 1,365.9 and 1,478.8 mbsl and a section of the core centered around 2,117.0 mbsl. The MII values of these locations ranged from 2 to 2.5. Areas with low bioerosion (all samples 100 µm long; they extend into glass shards from free surfaces (broken shards, vesicles, fractures). Morphologic characterization of microendolithic borings quantitatively describes them for comparison with other occurrences and aids in understanding the interactions between microorganisms and basaltic glass that result in the dissolution of the glass. The first step in working with these features as trace fossils was to modify the ichnofabric index of Droser and Bottjer (1986) for use with minute features that extend into homogeneous material. The modification includes six semiquantitative classes of disruption and is scale-independent, applicable to any size feature. The second step was to apply the new microendolithic ichnofabric index (MII) to the HSDP samples. Analysis of the HSDP samples using the MII showed that the abundance of bioerosion varied throughout the core. Assigned MII values ranged from 1 to 3, average MII values ranged from 1 to 2.44, while the mean MII value of 1.2. Areas with the most bioerosion were located between 1,365.9 and 1,478.8 mbsl and a section of the core centered around 2,117.0 mbsl. The MII values of these locations ranged from 2 to 2.5. Areas with low bioerosion (all samples <2) were located between 1,079.0 and 1,320.0 mbsl, 1,799.0 and 1,900.0 mbsl, and all depths below 2,500.0 mbsl. Lastly, such features as length, diameter, ornamentation, density, and complexity and tortuosity were measured to better describe the interactions between microorganisms and basaltic hyaloclastite media. The shortest measured 0.907 µm and the longest measured 129.22 µm. Lengths were approximately log-normally distributed with a geometric mean of 18.9 µm. The tortuosity of borings had a median of 1.29 with a range of 1.227 to 1.37. The least tortuous measured 1.22 and the most tortuous measured 16.46. This was one of the first attempts to quantify the range of morphology and density, of euendolithic microborings in basalt glass. This study extends the sampling scale for ichnological study to what is near the minimum size range of trace fossils. It demonstrates that trace fossil abundance does not simply decrease with depth in ocean islands, unlike basalts of oceanic crust, but varies, probably as a result of variation of the rate of accumulation of suitable substrates
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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