AGE-OF-PARENT DEPENDENT MUTATION RATE AND WEAK CHILDREN IN THE PENNA MODEL IN BIOLOGICAL AGEING

1996 ◽  
Vol 07 (05) ◽  
pp. 731-737 ◽  
Author(s):  
K. NIKOLAJ BERNTSEN
Keyword(s):  
Mutation Rate ◽  
High Mortality ◽  
Biological Ageing ◽  
Age Dependent ◽  
Penna Model

We investigate the effect of an age-dependent mutation rate in the Penna model of ageing and then we observe that the high mortality for human babies can be reproduced by the model if one assumes babies to be weaker than adults.

The age structure of a striped maple population

1979 ◽  
Vol 9 (4) ◽  
pp. 504-508 ◽  
Author(s):  
David E. Hibbs
Keyword(s):  
Structure Analysis ◽  
High Mortality ◽  
Age Structure ◽  
Mortality Rates ◽  
Population Age Structure ◽  
Survivorship Curve ◽  
Age Dependent ◽  
Gap Phase ◽  
Annual Mortality

Cohort and population age structure analysis showed that, after the initially high mortality rates of the 1st year (87.5%), striped maple seedlings (Acerpensylvanicum L.) underwent practically no mortality until the age of 15. Annual mortality was up (3.8%) between the ages of 16 and 40, then dropped to a lower level (1.6%). Mortality was age dependent and generally density independent. The survivorship curve agrees well with a pattern that could be expected of a species whose strategy is gap phase replacement.

Strategies of Reproduction and Longevity

1998 ◽  
Vol 09 (06) ◽  
pp. 787-791 ◽  
Author(s):  
M. Argollo de Menezes ◽  
A. Racco ◽  
T. J. P. Penna
Keyword(s):  
Computer Simulations ◽  
Mutation Accumulation ◽  
Biological Ageing ◽  
Penna Model

In this work we try to verify whether the increased lifespan of trees and some lobsters, like Homarus, whose fertility increases with advancing age, can be explained by the mutation accumulation theory of biological ageing. Computer simulations of the Penna model seems to support this hypothesis, showing that it is a robust strategy of reproduction.

Biological ageing with birth rate controlled by mutations in the Penna model

2000 ◽  
Vol 119 (2) ◽  
pp. 139-144 ◽  
Author(s):  
M. Magdoń-Maksymowicz ◽  
A. Z. Maksymowicz ◽  
K. Kułakowski
Keyword(s):  
Birth Rate ◽  
Biological Ageing ◽  
Penna Model ◽  
Rate Controlled

scholarly journals Age-Related Survival and Behavior of Snowy Plover Chicks

The Condor ◽  
2007 ◽  
Vol 109 (3) ◽  
pp. 638-647 ◽  
Author(s):  
Mark A. Colwell ◽  
Susan J. Hurley ◽  
James N. Hall ◽  
Stephen J. Dinsmore
Keyword(s):  
High Mortality ◽  
Chick Survival ◽  
Lower Survival ◽  
Charadrius Alexandrinus ◽  
Avian Predators ◽  
Age Related ◽  
Age Dependent ◽  
Snowy Plover ◽  
And Behavior ◽  
Related Survival

AbstractAbstract. Precocial young often experience high mortality prior to achieving flight, especially in the first days after hatching. We quantified relationships between chick age, survival, behavior, and response to natural and anthropogenic danger for the threatened Western Snowy Plover (Charadrius alexandrinus nivosus) in coastal northern California, USA. Plover chicks were most likely to die in the first three days of their 28-day prefledging period, especially on sandy ocean beaches compared to coarser substrates of river habitats. Chick survival in both habitats increased across the ∼120-day chick-rearing period. Improved survival of older chicks coincided with an age-related reduction in brooding and increased distance from the tending parent, which was not related to season. Lower survival of younger chicks was correlated with a tendency to lie motionless when approached by humans; nearly all older chicks responded to human approach by running to evade danger. Chicks of all ages were more likely to lie motionless when potential avian predators flew nearby. Age-dependent survival of Snowy Plover chicks paralleled a trend of increasing development, thermal independence from adults, and capability of evading predators.

PROBABILISTIC GENERALIZATION OF PENNA AGEING MODEL AND THE OLDEST OLD

1999 ◽  
Vol 10 (07) ◽  
pp. 1363-1365 ◽  
Author(s):  
D. STAUFFER
Keyword(s):  
Oldest Old ◽  
Demographic Data ◽  
Absolute Maximum ◽  
Maximum Life Span ◽  
Monte Carlo Data ◽  
Biological Ageing ◽  
Probabilistic Generalization ◽  
Ageing Model ◽  
Penna Model ◽  
Rich Countries

Using a 1995 method of Thoms et al., the traditional Penna model of biological ageing is modified such that there is no more absolute maximum life span; instead, our Monte Carlo data are similar to real demographic data collected by Thatcher et al., for rich countries.

The Eve effect in the Penna model of biological ageing

1999 ◽  
Vol 273 (1-2) ◽  
pp. 169-181 ◽  
Author(s):  
Danuta Makowiec ◽  
Jakub Da̧bkowski ◽  
Małgorzata Groth
Keyword(s):  
Biological Ageing ◽  
Penna Model
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