Apparent Systematic Effects on Species-Area Curves under Isolation and Evolution

1985 ◽  
pp. 171-178 ◽  
Author(s):  
Mark Williamson
Keyword(s):  
Systematic Effects ◽  
Species Area

Systematic effects in observed parallaxes

1978 ◽  
Vol 48 ◽  
pp. 31-35
Author(s):  
R. B. Hanson
Keyword(s):  
Error Estimates ◽  
Zero Point ◽  
Absolute Zero ◽  
Apparent Magnitude ◽  
Coherent System ◽  
Preliminary Results ◽  
General Catalogue ◽  
Systematic Effects ◽  
New Evidence ◽  
Right Ascension

Several outstanding problems affecting the existing parallaxes should be resolved to form a coherent system for the new General Catalogue proposed by van Altena, as well as to improve luminosity calibrations and other parallax applications. Lutz has reviewed several of these problems, such as: (A) systematic differences between observatories, (B) external error estimates, (C) the absolute zero point, and (D) systematic observational effects (in right ascension, declination, apparent magnitude, etc.). Here we explore the use of cluster and spectroscopic parallaxes, and the distributions of observed parallaxes, to bring new evidence to bear on these classic problems. Several preliminary results have been obtained.

Species-Area Effects for Leafhoppers on British Trees: Comments on the Paper by Rey et al.

1982 ◽  
Vol 119 (4) ◽  
pp. 573-575
Author(s):  
M. F. Claridge ◽  
M. R. Wilson
Keyword(s):  
Area Effects ◽  
Species Area

scholarly journals Observed Relations Between Physical Properties and MK Classification as Functions of Metal Abundance for F5-K4 Stars

1976 ◽  
Vol 72 ◽  
pp. 75-78
Author(s):  
M. Grenon
Keyword(s):  
Physical Properties ◽  
Spectral Range ◽  
Spectral Type ◽  
Photometric System ◽  
Luminosity Class ◽  
Empirical Relations ◽  
Metal Abundance ◽  
Systematic Effects ◽  
The Absolute ◽  
Absolute Magnitudes

The Geneva photometric system has been calibrated in terms of [M/H], θeff, Mv in the spectral range F5 to K4. As the spectral type is a datum generally available, we derive empirical relations showing the coupling of θeff and [M/H] at given spectral type and luminosity class. Similar relations are offered for the absolute magnitudes and provide a more accurate means for deriving spectroscopic parallaxes. Systematic effects on the estimation of the luminosity class are also shown.

Scale dependence of species‐area relationships is widespread but generally weak in Palaearctic grasslands

2021 ◽  
Author(s):  
Jinghui Zhang ◽  
François Gillet ◽  
Sándor Bartha ◽  
Juha Mikael Alatalo ◽  
Idoia Biurrun ◽  
...  
Keyword(s):  
Scale Dependence ◽  
Species Area
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