scholarly journals Variation in generation time reveals density regulation as an important driver of pace of life in a bird metapopulation

2021 ◽  
Author(s):  
Yimen G. Araya‐Ajoy ◽  
Alina K. Niskanen ◽  
Hannah Froy ◽  
Peter Sjolte Ranke ◽  
Thomas Kvalnes ◽  
...  
Keyword(s):  
Generation Time ◽  
Density Regulation ◽  
Pace Of Life

scholarly journals Spatial and temporal variation in the generation time of a bird metapopulation: density regulation and the evolutionary potential of a pace-of-life measure

2020 ◽  
Author(s):  
Yimen Araya-Ajoy ◽  
Alina Niskanen ◽  
Peter Ranke ◽  
Hannah Froy ◽  
Thomas Kvalnes ◽  
...  
Keyword(s):  
Generation Time ◽  
Life History Strategies ◽  
Spatial And Temporal Variation ◽  
Lifetime Reproductive Success ◽  
Evolutionary Potential ◽  
Life Measure ◽  
Density Regulation ◽  
Pace Of Life ◽  
Generation Times ◽  
Classic Theory

Generation time determines the pace of key demographic and evolutionary processes. Quantified as the weighted mean age at reproduction, it can be studied as a trait that varies within and among populations and may evolve in response to ecological conditions. We combined quantitative genetic analyses with age- and density-dependent models to study generation time variation in a bird metapopulation. Generation time was heritable, and males had longer generation times compared with females. Individuals with longer generation times had a higher lifetime reproductive success but not a higher expected population growth rate. Density regulation acted on recruit production, suggesting that longer generation times should be favored when populations are closer to carrying capacity. Furthermore, generation times were shorter when populations were growing, and longer when populations were closer to equilibrium or declining. These results support classic theory predicting that density regulation is an important driver of the pace of life-history strategies.

scholarly journals Demographic drivers of generation time in a bird metapopulation: evolutionary potential and the ecological determinants of pace-of-life

2020 ◽  
Author(s):  
Yimen Araya Ajoy ◽  
Alina Niskanen ◽  
Peter Ranke ◽  
Hannah Froy ◽  
Thomas Kvalnes ◽  
...  
Keyword(s):  
Generation Time ◽  
Evolutionary Potential ◽  
Pace Of Life

scholarly journals Demographic measures of an individual’s “pace of life”: fecundity rate, lifespan, generation time, or a composite variable?

2018 ◽  
Vol 72 (5) ◽  
Author(s):  
Yimen G. Araya-Ajoy ◽  
Geir H. Bolstad ◽  
Jon Brommer ◽  
Vincent Careau ◽  
Niels J. Dingemanse ◽  
...  
Keyword(s):  
Generation Time ◽  
Composite Variable ◽  
Fecundity Rate ◽  
Pace Of Life

In Vitro Thrombogenicity Tests of Factor IX Concentrates

1979 ◽  
Vol 42 (05) ◽  
pp. 1355-1367 ◽  
Author(s):  
C V Prowse ◽  
A Chirnside ◽  
R A Elton
Keyword(s):  
Factor Viii ◽  
Partial Thromboplastin Time ◽  
Generation Time ◽  
Activated Partial Thromboplastin Time ◽  
Factor Ix ◽  
In Vitro Tests ◽  
Factor Viii Inhibitor ◽  
Factor Ixa ◽  
Viii Inhibitor

SummaryVarious factor IX concentrates have been examined in a number of in vitro tests of thrombogenicity. The results suggest that some tests are superfluous as in concentrates with activity in any of these tests activation is revealed by a combination of the non-activated partial thromboplastin time, the thrombin (or Xa) generation time and factor VIII inhibitor bypassing activity tests. Assay of individual coagulant enzymes revealed that most concentrates contained more factor IXa than Xa. However only a small number of concentrates, chiefly those that had been purposefully activated, contained appreciable amounts of either enzyme.

scholarly journals Pace of life and perceived stress in international students

PsyCh Journal ◽  
2021 ◽  
Author(s):  
Sonia Lippke ◽  
Torven M. Schalk ◽  
Ulrich Kühnen ◽  
Borui Shang
Keyword(s):  
International Students ◽  
Perceived Stress ◽  
Pace Of Life
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