scholarly journals Do metacommunity mass effects predict changes in species incidence and abundance?

Ecography ◽  
2017 ◽  
Vol 41 (1) ◽  
pp. 11-23 ◽  
Author(s):  
Donald M. Waller ◽  
Erika L. Mudrak ◽  
David A. Rogers
Keyword(s):  
Mass Effects ◽  
Species Incidence

scholarly journals Quark mass effects in two-loop Higgs amplitudes

2020 ◽  
Vol 2020 (7) ◽  
Author(s):  
Charalampos Anastasiou ◽  
Nicolas Deutschmann ◽  
Armin Schweitzer
Keyword(s):  
Quark Mass ◽  
Mass Effects

SENSITIVE VIBRATIONAL FREQUENCIES: IV. MASS EFFECTS

1959 ◽  
Vol 37 (11) ◽  
pp. 1896-1902 ◽  
Author(s):  
J. K. Wilmshurst
Keyword(s):  
Molecular System ◽  
General Rule ◽  
Vibrational Frequencies ◽  
Mass Effects ◽  
Atomic Properties ◽  
Calculated Mass

The correlation of vibrational frequencies with atomic properties of substituent atoms in the molecular system is critically examined for reality in the light of possible mass effects. The general rule is formulated that only frequencies continuously characteristic of a grouping in the mass–frequency plot can be used in such correlations. Calculated mass–frequency plots are presented for the systems XC≡N, XC≡CX, XC≡CY, X2C=CX2, X2C=O, X2P=O, XCH3, X2CH2, X3CH.

scholarly journals Seed mass effects on germination and growth of diverse European Scots pine populations

1994 ◽  
Vol 24 (2) ◽  
pp. 306-320 ◽  
Author(s):  
P.B. Reich ◽  
J. Oleksyn ◽  
M.G. Tjoelker
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Scots Pine ◽  
Field Experiments ◽  
Seed Mass ◽  
Growing Season ◽  
Turkish Population ◽  
Dry Mass ◽  
Relative Growth ◽  
Mass Effects

Seedlings of 24 European Scots pine (Pinussylvestris L.) populations were grown in controlled environment chambers under simulated photoperiodic conditions of 50 and 60°N latitude to evaluate the effect of seed mass on germination and seedling growth characteristics. Seeds of each population were classified into 1-mg mass classes, and the four classes per population with the highest frequencies were used. Photoperiod had minimal influence on seed mass effects. Overall, seed mass was positively related to the number of cotyledons and hypocotyl height. Populations differed significantly in seed mass effect on biomass. In northern populations (55–61°N), dry mass at the end of the first growing season was little affected by seed mass. However, dry mass in 9 of 15 central populations (54–48°N) and all southern (<45°N) populations correlated positively with seed mass. Relative growth rate was not related to seed mass within or across populations, and thus early growth is largely determined by seed mass. Relative growth rate also did not differ among populations, except for a geographically isolated Turkish population with the highest seed mass and lowest relative growth rate. After one growing season, height was positively correlated (r2 > 0.6) with seed mass in 15 populations. To check the duration of seed mass effects, height growth of 1- to 7-year-old field experiments established with the same seed lots were compared. Seed mass effects on height were strongest for 1-year-old seedlings and declined or disappeared by the age of 5–7 years among central and southern populations, but remained stable over that time in northern populations.

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