Time-Specific Life Tables Contrasted with Observed Survivorship

Biometrics ◽  
1947 ◽  
Vol 3 (3) ◽  
pp. 129 ◽  
Author(s):  
Margaret Merrell
Keyword(s):  
Life Tables ◽  
Time Specific

Time-Specific Life Tables for Acyrthosiphon kondoi (Homoptera: Aphididae) in First Crop Alfalfa in Oklahoma

1990 ◽  
Vol 19 (4) ◽  
pp. 1001-1009 ◽  
Author(s):  
M. Ashraf Poswal ◽  
R. C. Berberet ◽  
L. J. Young
Keyword(s):  
Life Tables ◽  
Time Specific

Age-Grouping, Time-Specific Life-Tables, and Predictive Population Models

2021 ◽  
pp. 362-383
Author(s):  
Peter A. Henderson
Keyword(s):  
Developmental Stage ◽  
Food Availability ◽  
Life Tables ◽  
Population Models ◽  
Leslie Matrix ◽  
Population Modelling ◽  
Temperature Dependent ◽  
Animal Groups ◽  
Leslie Matrices ◽  
Time Specific

This chapter describes techniques to create life-tables for animals whose generations overlap widely. Age-grouping is a prerequisite for these methods, which have been most widely applied to vertebrate populations. Age cannot be inferred from the developmental stage without reference to the environment. The speed of development may be temperature-dependent or influenced by factors such as oxygen and food availability. The methods for ageing animal groups, including invertebrates, fish, reptiles, amphibians, birds, and mammals, are reviewed. Time-specific life-tables, population modelling, and Leslie matrices are described. R code to analyze Leslie matrix dynamics is presented.

Comments on the Use of Time-Specific and Cohort Life Tables

Ecology ◽  
1993 ◽  
Vol 74 (7) ◽  
pp. 2164-2168 ◽  
Author(s):  
George E. Menkens ◽  
Mark S. Boyce
Keyword(s):  
Life Tables ◽  
Use Of Time ◽  
Time Specific

A comparison of time-specific and cohort-specific life tables for Belding's ground squirrels, Spermophilus beldingi

1986 ◽  
Vol 64 (3) ◽  
pp. 602-605 ◽  
Author(s):  
Richard M. Zammuto ◽  
Paul W. Sherman
Keyword(s):  
Life Table ◽  
Survival Data ◽  
Life Tables ◽  
Ground Squirrels ◽  
Age Classes ◽  
Free Living ◽  
Female Population ◽  
Spermophilus Beldingi ◽  
Time Specific ◽  
Combined Data

Eight years of age-specific survival data and 6 years of fecundity data from a free-living population of Belding's ground squirrels (Spermophilus beldingi) at Tioga Pass, California, were used to test the hypothesis that time-specific life tables, based on data from individual years, were different from the cohort-specific life table, based on the combined data from all years. The results indicated that neither the age structure of the male nor the female population significantly differed among years (all P > 0.05). Furthermore, the means and the variances in the sizes of weaned litters did not differ among years either in the population at large or within individual age-classes (all P > 0.05). A 27-day snowstorm that occurred in the spring of 1977 increased mortality and reduced reproduction, but it did not change the ground squirrels' age-specific survival or fecundity patterns. Taken together, our analyses revealed that each time-specific life table provided age-specific survival and fecundity estimates that were statistically indistinguishable (P > 0.05) from the composite, cohort-specific life table for each sex, regardless of severe environmental conditions. This is the first demonstration of the equivalence of time- and cohort-specific life tables for a free-living population of mammals.

Time-Specific and Cohort Life Tables for Belding's Ground Squirrels

Ecology ◽  
1993 ◽  
Vol 74 (7) ◽  
pp. 2168-2169
Author(s):  
Paul W. Sherman ◽  
Richard M. Zammuto
Keyword(s):  
Life Tables ◽  
Ground Squirrels ◽  
Time Specific

Life history and life tables of western flower thrips, Frankliniella occidentalis (Thysanoptera: Thripidae), on English cucumbers

1994 ◽  
Vol 84 (2) ◽  
pp. 219-224 ◽  
Author(s):  
Wilma G. Gaum ◽  
J. H. Giliomee ◽  
K. L. Pringle
Keyword(s):  
Life History ◽  
Frankliniella Occidentalis ◽  
Western Flower Thrips ◽  
Threshold Value ◽  
Life Tables ◽  
Adult Longevity ◽  
Reproduction Rate ◽  
Flower Thrips ◽  
Different Temperatures ◽  
Time Specific

AbstractThe life history of Frankliniella occidentalis (Pergande) was studied at six different temperatures on English cucumbers, cv. Pepinex. Life tables constructed indicate that the highest population growth rate (rm) and net reproduction rate (R0) occur at 30°C and the lowest at 15°C, where the population remains nearly stable. Generation time (T) was the shortest at 30°C and increased as temperature decreased. At 30°C oviposition increased, females matured and reproduced earlier and the time specific fecundity (mx) was higher than at lower temperatures. Adult longevity was shortest at 30°C and longest at 15°C. The threshold value for development was determined as 9.4°C. Average duration of each developmental stage and the sex ratio at six different temperatures are given.

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