scholarly journals Testing macroecological abundance patterns: The relationship between local abundance and range size, range position and climatic suitability among European vascular plants

2020 ◽  
Vol 47 (10) ◽  
pp. 2210-2222
Author(s):  
Maria Sporbert ◽  
Petr Keil ◽  
Gunnar Seidler ◽  
Helge Bruelheide ◽  
Ute Jandt ◽  
...  
Keyword(s):  
Vascular Plants ◽  
Size Range ◽  
Range Size ◽  
Climatic Suitability ◽  
Abundance Patterns ◽  
Local Abundance ◽  
The Relationship

On the Relationship between Range Size and Local Abundance: Back to Basics

Oikos ◽  
1997 ◽  
Vol 78 (1) ◽  
pp. 183 ◽  
Author(s):  
R. D. Holt ◽  
J. H. Lawton ◽  
K. J. Gaston ◽  
T. M. Blackburn
Keyword(s):  
Range Size ◽  
Local Abundance ◽  
The Relationship

Determinants of local abundance and range size in forest vascular plants

2006 ◽  
Vol 15 (3) ◽  
pp. 237-247 ◽  
Author(s):  
Annette Kolb ◽  
Frank Barsch ◽  
Martin Diekmann
Keyword(s):  
Vascular Plants ◽  
Range Size ◽  
Local Abundance

Determinants of local abundance and range size in forest vascular plants

2006 ◽  
Vol 0 (0) ◽  
pp. 060721073457006-???
Author(s):  
Annette Kolb ◽  
Frank Barsch ◽  
Martin Diekmann
Keyword(s):  
Vascular Plants ◽  
Range Size ◽  
Local Abundance

scholarly journals The effects of geographic range size and abundance on extinction during a time of “sluggish”’ evolution

Paleobiology ◽  
2020 ◽  
pp. 1-14
Author(s):  
Michelle M. Casey ◽  
Erin E. Saupe ◽  
Bruce S. Lieberman
Keyword(s):  
North American ◽  
Fossil Record ◽  
Extinction Risk ◽  
Geographic Range ◽  
Range Size ◽  
Late Paleozoic ◽  
The North ◽  
Geographic Range Size ◽  
The Relationship ◽  
Habitat Tracking

Abstract Geographic range size and abundance are important determinants of extinction risk in fossil and extant taxa. However, the relationship between these variables and extinction risk has not been tested extensively during evolutionarily “quiescent” times of low extinction and speciation in the fossil record. Here we examine the influence of geographic range size and abundance on extinction risk during the late Paleozoic (Mississippian–Permian), a time of “sluggish” evolution when global rates of origination and extinction were roughly half those of other Paleozoic intervals. Analyses used spatiotemporal occurrences for 164 brachiopod species from the North American midcontinent. We found abundance to be a better predictor of extinction risk than measures of geographic range size. Moreover, species exhibited reductions in abundance before their extinction but did not display contractions in geographic range size. The weak relationship between geographic range size and extinction in this time and place may reflect the relative preponderance of larger-ranged taxa combined with the physiographic conditions of the region that allowed for easy habitat tracking that dampened both extinction and speciation. These conditions led to a prolonged period (19–25 Myr) during which standard macroevolutionary rules did not apply.

Anisotropic Microstructure of Plasma-Sprayed Deposits

1998 ◽  
Author(s):  
J. lavsky ◽  
G.G. Long ◽  
A.J. Allen ◽  
L. Leblanc ◽  
M. Prystay ◽  
...  
Keyword(s):  
Small Angle Neutron Scattering ◽  
Size Range ◽  
Measurement Techniques ◽  
Quantitative Information ◽  
Underlying Structure ◽  
Impregnation Process ◽  
Direct Technique ◽  
Plasma Sprayed ◽  
The Relationship ◽  
Different Parts

Abstract The microstructure of plasma-sprayed deposits (PSD) is dominated by two void systems - interlamellar pores and intralamellar cracks - each with a different anisotropy. Varying anisotropics and crack-to-pore ratios within PSDs are responsible for the anisotropic properties observed in the deposits. While it is difficult to apply standard porosity measurement techniques to the assessment of anisotropic microstructures, novel techniques utilizing different approaches have recently emerged. Image analysis (IA) of impregnated PSD samples is the most direct technique. The structure is stabilized by impregnation and then polished and imaged. The limitations of IA lie in the impregnation process and in the subsequent polishing. Also, the images produced from anisotropic materials can be difficult to interpret quantitatively. The technique of small-angle neutron scattering (SANS) has recently been successfully applied to the study of PSDs. The major advantages of SANS are that it does not require sample preparation and that quantitative information can be gotten about the separate crack and pore systems, including their distinctive anisotropics. However, the relationship between the SANS results and the underlying structure is more complex and less intuitive than for IA, and the availability of the SANS technique is limited by the need to have access to a powerful neutron source, such as a reactor. Also, the two techniques present different views of the microstructure because of the different sensitivities in different parts of the size range. This paper compares results from IA and SANS from a set of thick plasma-sprayed ceramic deposits possessing a range of crack/pore microstructures, and discusses how the two techniques might complement one another.

Mercury levels in six species of Australian commercial fish

1980 ◽  
Vol 31 (4) ◽  
pp. 469 ◽  
Author(s):  
R Chvojka ◽  
RJ Williams
Keyword(s):  
Total Mercury ◽  
Size Range ◽  
Graphical Method ◽  
Correlation Coefficients ◽  
Mercury Content ◽  
Fish Length ◽  
Commercial Fish ◽  
The Relationship ◽  
Commercial Size ◽  
Zeus Faber

The total mercury content of six species of Australian commercial fish (John dory. Zeus faber: mirror dory. Zenopsis nebulosus; tiger flathead, Neoplatycephalus richardsoni; rubberlip morwong, Nemadactylus douglasii; jackass morwong, Nemadactylus macroprerus; and sand whiting, Sillago ciliata) is reported. Total mercury content is regressed against fish length and the resultant equations and correlation coefficients are presented for each species. A length-frequency histogram derived from the Sydney Fish Market data and a length-mercury content curve are plotted as an overlay for each of the six species. The integrated average mercury content (mg/kg) has been calculated for each species and these are as follows: sand whiting, 0.08; rubberlip morwong, 0.13; tiger flathead, 0.14; John dory, 0.14; mirror dory, 0.15; and jackass morwong, 0.16. The graphical method adequately demonstrates the relationship between mercury levels and the commercial size range of particular species.

scholarly journals Surface Response Based Modeling of Liposome Characteristics in a Periodic Disturbance Mixer

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 235 ◽  
Author(s):  
Rubén R. López ◽  
Ixchel Ocampo ◽  
Luz-María Sánchez ◽  
Anas Alazzam ◽  
Karl-F. Bergeron ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Flow Rate ◽  
Size Range ◽  
Physicochemical Characteristics ◽  
Flow Rate Ratio ◽  
Total Flow ◽  
Experimental Conditions ◽  
Periodic Disturbance ◽  
Liposome Size ◽  
The Relationship

Liposomes nanoparticles (LNPs) are vesicles that encapsulate drugs, genes, and imaging labels for advanced delivery applications. Control and tuning liposome physicochemical characteristics such as size, size distribution, and zeta potential are crucial for their functionality. Liposome production using micromixers has shown better control over liposome characteristics compared with classical approaches. In this work, we used our own designed and fabricated Periodic Disturbance Micromixer (PDM). We used Design of Experiments (DoE) and Response Surface Methodology (RSM) to statistically model the relationship between the Total Flow Rate (TFR) and Flow Rate Ratio (FRR) and the resulting liposomes physicochemical characteristics. TFR and FRR effectively control liposome size in the range from 52 nm to 200 nm. In contrast, no significant effect was observed for the TFR on the liposomes Polydispersity Index (PDI); conversely, FRR around 2.6 was found to be a threshold between highly monodisperse and low polydispersed populations. Moreover, it was shown that the zeta potential is independent of TFR and FRR. The developed model presented on the paper enables to pre-establish the experimental conditions under which LNPs would likely be produced within a specified size range. Hence, the model utility was demonstrated by showing that LNPs were produced under such conditions.

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