The Construction, Description, and Analysis of Age-Specific Life-Tables

Southwood's Ecological Methods ◽

10.1093/oso/9780198862277.003.0011 ◽

2021 ◽

pp. 336-361

Author(s):

Peter A. Henderson

Keyword(s):

Life Table ◽

Population Growth Rate ◽

Survival Rates ◽

Frequency Data ◽

Development Stages ◽

Life Table Data ◽

Key Factor ◽

Demographic Methods ◽

Key Factor Analysis ◽

Table Data

Methods for constructing a life-table and budget for a species are described, and the various methods for the analysis of stage-frequency data reviewed. Stage-frequency data comprise counts of the individuals in different development stages in samples taken from a population over a period of time. The analysis of stage-frequency data to estimate the durations of the stages, the numbers entering stages, and survival rates is described. Examples of survivorship curves are presented, and the calculation of population growth rate described. Analysis of life-table data and demographic methods, including key-factor analysis, are described.

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KEY-FACTOR/KEY-STAGE ANALYSIS FOR LIFE TABLE DATA

Ecology ◽

10.1890/0012-9658(1999)080[0533:kfksaf]2.0.co;2 ◽

1999 ◽

Vol 80 (2) ◽

pp. 533-537 ◽

Cited By ~ 17

Author(s):

Kohji Yamamura

Keyword(s):

Life Table ◽

Life Table Data ◽

Key Factor ◽

Table Data ◽

Stage Analysis

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Herpetogramma bipunctalis (Lepidoptera: Crambidae) biology and techniques for rearing on leaves of the blackberry (Rubus spp., Rosaceae)

Brazilian Journal of Biology ◽

10.1590/s1519-69842013000100019 ◽

2013 ◽

Vol 73 (1) ◽

pp. 179-184

Author(s):

GI. Diez-Rodríguez ◽

LK. Hübner ◽

LEC. Antunes ◽

DE. Nava

Keyword(s):

Overall Survival ◽

Life Table ◽

Survival Rates ◽

Biological Data ◽

Pupal Weight ◽

Paper Towel ◽

Life Table Data ◽

Oviposition Substrate ◽

The Mean ◽

Table Data

The larvae of the southern beet webworm Herpetogramma bipunctalis (Fabricius, 1794) damage the leaves of species in the plant genus Rubus. The present study investigated the biology of H. bipunctalis and developed a protocol for raising H. bipunctalis under laboratory conditions. On the basis of the biological data, we devised a life table. In order to develop the rearing procedures, we determined which oviposition substrate and blackberry cultivar were the most appropriate for larval development. The mean durations of the egg, larval, and pupal stages were 5.59 days, 26.37 days, and 13.37 days, respectively, and the corresponding survival rates were 80.83%, 49.07%, and 83.23%. The mean pupal weight was 0.0491 g for males and 0.0536 g for females. The mean life cycle (egg-to-adult) period was 45.33 days, and overall survival to adulthood was 33.01%. H. bipunctalis females laid a mean of 252.63 eggs over a mean of 13.60 days of oviposition; the mean pre-oviposition period was 2.67 days. Mean female and male life spans were 17.51 and 19.25 days, respectively, and the sex ratio was 0.51. The life-table data indicated that H. bipunctalis can reproduce 57.9 times per generation. Each cage contained one blackberry leaf placed on a paper towel. This method allowed us to obtain the greatest number of eggs. The larval stage was shorter for insects reared on leaves of the Guarani cultivar than for those reared on leaves of the Xavante cultivar (22.63 vs. 26.37 days). These basic data can aid in establishing strategies for the management of H. bipunctalis on blackberry farms.

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