scholarly journals Tolerance niche expansion and potential distribution prediction during Asian openbill bird range expansion

2021 ◽  
Author(s):  
Yu Lei ◽  
Qiang Liu
Keyword(s):  
Range Expansion ◽  
Potential Distribution ◽  
Niche Expansion ◽  
Asian Openbill

scholarly journals Beyond tracking climate: niche evolution during native range expansion and its implications for novel invasions

2021 ◽  
Author(s):  
Nicky Lustenhouwer ◽  
Ingrid M. Parker
Keyword(s):  
Climate Change ◽  
Range Expansion ◽  
Niche Conservatism ◽  
Native Range ◽  
Niche Evolution ◽  
Local Conditions ◽  
Niche Expansion ◽  
Climate Niche ◽  
Niche Shifts ◽  
Native Populations

Ecological niche models have been instrumental in understanding and forecasting the widespread shifts in species distributions under global change. However, growing evidence of evolution in spreading populations challenges their key assumption of niche conservatism, limiting model transferability in space and time. Climate niche evolution has been studied extensively in invasive species, but may also occur in native populations tracking climate change, when species encounter novel abiotic conditions that vary with latitude. We compared niche shifts during native range expansion and during invasion in Dittrichia graveolens, a Mediterranean annual plant species that is currently undergoing both types of spread. We asked whether the species' northward native range expansion in Eurasia matched climate change from 1901-1930 to 1990-2019, or if further range expansion was promoted by niche evolution. In addition, we asked how niche expansion in the native range affected forecasts of two ongoing invasions in Australia and California. We quantified niche shifts in environmental space using the analytical framework of niche centroid shift, overlap, unfilling, and expansion (COUE), and examined associated distribution changes in geographic space using Maximum Entropy modeling. Our results show that D. graveolens expanded its native range well beyond what would be sufficient to track climate change, a shift associated with a 5.5% niche expansion to include more temperate climates. In contrast, both invasions showed evidence of niche conservatism, with niche filling depending on invader residence time. Including the expanded native niche in invasion projections added new areas at risk of invasion, but none of these has been colonized at present. We conclude that native populations may track climate change and adapt to novel local conditions in parallel, causing an evolutionary expansion of the climate niche and more widespread range expansion than expected based on climate change alone.

The effects of surface absorbed monolayer microdiffraction patterns

1988 ◽  
Vol 46 ◽  
pp. 680-681
Author(s):  
M. Pan ◽  
J.M. Cowley
Keyword(s):  
Surface Potential ◽  
Electron Probe ◽  
Potential Distribution ◽  
Crystal Surface ◽  
Normal Direction ◽  
Surface Image ◽  
Extended Surface ◽  
Gas Molecules ◽  
Surface Nature ◽  
Electron Microdiffraction

Electron microdiffraction patterns, obtained when a small electron probe with diameter of 10-15 Å is directed to run parallel to and outside a flat crystal surface, are sensitive to the surface nature of the crystals. Dynamical diffraction calculations have shown that most of the experimental observations for a flat (100) face of a MgO crystal, such as the streaking of the central spot in the surface normal direction and (100)-type forbidden reflections etc., could be explained satisfactorily by assuming a modified image potential field outside the crystal surface. However the origin of this extended surface potential remains uncertain. A theoretical analysis by Howie et al suggests that the surface image potential should have a form different from above-mentioned image potential and also be smaller by several orders of magnitude. Nevertheless the surface potential distribution may in practice be modified in various ways, such as by the adsorption of a monolayer of gas molecules.

INFLUENCE OF HUMIDITY ON POTENTIAL DISTRIBUTION IN BaTiO3 CERAMICS AND CRYSTALS

1972 ◽  
Vol 33 (C2) ◽  
pp. C2-114-C2-115
Author(s):  
G. ORMANCEY
Keyword(s):  
Potential Distribution

Investigation on Transmission Power Control Suitable for Heterogeneous Network Employing Cell Range Expansion in LTE-Advanced Uplink

2013 ◽  
Vol E96.B (4) ◽  
pp. 1051-1060 ◽  
Author(s):  
Akihito MORIMOTO ◽  
Nobuhiko MIKI ◽  
Hiroyuki ISHII ◽  
Daisuke NISHIKAWA ◽  
Yukihiko OKUMURA
Keyword(s):  
Power Control ◽  
Range Expansion ◽  
Heterogeneous Network ◽  
Transmission Power ◽  
Transmission Power Control ◽  
Cell Range Expansion ◽  
Lte Advanced ◽  
Cell Range
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