Life tables and the intrinsic rate of increase of Earias vittella (Lepidoptera: Noctuidae) reared on different hosts

2005 ◽  
Vol 25 (02) ◽  
Author(s):  
N.S. Satpute ◽  
S.D. Deshmukh ◽  
N.G.V. Rao ◽  
S.A. Nimbalkar
Keyword(s):  
Intrinsic Rate ◽  
Life Tables ◽  
Intrinsic Rate Of Increase ◽  
Earias Vittella ◽  
Rate Of Increase ◽  
Lepidoptera Noctuidae

scholarly journals Age-Stage, Two-Sex Life Tables of the Predatory Mite Cheyletus Malaccensis Oudemans at Different Temperatures

Insects ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 181
Author(s):  
Weiwei Sun ◽  
Miao Cui ◽  
Liyuan Xia ◽  
Qing Yu ◽  
Yang Cao ◽  
...  
Keyword(s):  
Intrinsic Rate ◽  
Predatory Mite ◽  
Reproductive Rate ◽  
Life Tables ◽  
Intrinsic Rate Of Increase ◽  
Net Reproductive Rate ◽  
Acarus Siro ◽  
Rate Of Increase ◽  
Different Temperatures ◽  
Cheyletus Malaccensis

Cheyletus malaccensis Oudemans is a predatory mite inhabiting grain depots in China. The relationship between temperature and the population growth rate of C. malaccensis is useful for predicting its population dynamics. Age-stage, two-sex life tables of the predator, C. malaccensis, reared on Acarus siro were constructed under laboratory conditions at 22, 24, 28, 30, and 32 °C, 75% relative humidity, and a 0:24 h (L:D) photoperiod. Increasing temperature shortened the development time of the immature stages. The complete generation time of C. malaccensis ranged from 11.10 d to 27.50 d. Life table parameters showed that 28 °C was the optimum temperature for the growth and development of C. malaccensis; populations could increase rapidly at this temperature. The highest net reproductive rate (R0 = 290.25) and highest fecundity (544.52) occurred at 28 °C. Temperature significantly affected the intrinsic rate of increase (r), fecundity, and finite rate of increase (λ). The values of age-specific fecundity (high to low) were 28 °C > 24 °C > 30 °C > 32 °C > 22 °C, while the values of age-stage-specific fecundity had the same trend.

scholarly journals Biology and life tables of Telenomus remus (Hymenoptera: Scelionidae) as parasitoid of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae)

2021 ◽  
Vol 948 (1) ◽  
pp. 012041
Author(s):  
Oktaviani ◽  
N Maryana ◽  
Pudjianto
Keyword(s):  
Life Table ◽  
Spodoptera Frugiperda ◽  
Intrinsic Rate ◽  
Immature Stage ◽  
Intrinsic Rate Of Increase ◽  
Reproduction Rate ◽  
Rate Of Increase ◽  
Net Reproduction ◽  
Lepidoptera Noctuidae ◽  
Telenomus Remus

Abstract Telenomus remus (Hymenoptera: Scelionidae), is an endoparasitoid on eggs of Spodoptera frugiperda (J. E. Smith). S. frugiperda. The information of T. remus as a natural enemy of S. frugiperda is very limited. The research objective is to determine some biological aspects of T. remus, i.e. longevity, fecundity, and life table variables. The demographic statistics using the jackknife method. T. remus is collected from the field identified as T. remus. The immature stage of T. remus reached 8.13 days, the longevity of the male was 10.07 days, while a female was 10.29 days with a fecundity of 75 eggs, and a sex ratio of male and female was 1:2.16. T. remus life table, i.e. gross reproduction rate (GRR) was 74.67 individuals/generation, net reproduction rate (R0) was 45260.60 females/females/generation, with generation period (T) was 8.62 days, and intrinsic rate of increase (r) was 1.24 females/female/day. The success parasitization of T. remus reaches 91%.

scholarly journals Biotic potential and reproductive parameters of Spodoptera cosmioides (Walker) (Lepidoptera: Noctuidae) in the laboratory

2019 ◽  
Vol 79 (3) ◽  
pp. 488-494 ◽  
Author(s):  
A. Specht ◽  
V. F. Roque-Specht
Keyword(s):  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Intrinsic Rate Of Increase ◽  
Reproductive Parameters ◽  
Finite Rate ◽  
Net Reproductive Rate ◽  
Biotic Potential ◽  
Rate Of Increase ◽  
The Mean ◽  
Lepidoptera Noctuidae

Abstract In this study we evaluate the biotic potential and reproductive parameters of Spodoptera cosmioides (Walker, 1858) under controlled conditions (25 ± 1 °C, 70 ± 10% RH and 14 hour photophase). Females, on average, (14.433 days) did not live significantly longer than their male counterparts (13.100 days). The mean durations of the pre-oviposition, oviposition and post-oviposition periods were 2.767, 10.600 and 1.067 days, respectively. The mean fecundity of females was 5,073.533 eggs and the mean fertility was 5,021.027 larvae. On average, females copulated 1.167 times. Fecundity was positively correlated with the number of copulations (r = 0.583, P <0.001). The number of copulations, however, was negatively correlated whit the duration of the pre-oviposition (r = -0.560, P = 0.007) and oviposition (r = -0.479, P = 0.048) periods, and overall longevity (r = -0.512, P = 0.031). The biotic potential was estimated at 6.547 x 1021 individuals/female/year. The net reproductive rate (Ro) was 2,193.722 times per generation and the mean generation time (T) was 46.407 days. The intrinsic rate of increase (rm) was 0.166, with a finite rate of increase (λ) of 1.180, per week.

scholarly journals Nine-year demography of the black-eared opossum Didelphis aurita (Didelphimorphia: Didelphidae) using life tables

2008 ◽  
Vol 25 (2) ◽  
pp. 206-213 ◽  
Author(s):  
Maja Kajin ◽  
Rui Cerqueira ◽  
Marcus V. Vieira ◽  
Rosana Gentile
Keyword(s):  
Intrinsic Rate ◽  
Life Tables ◽  
Reproductive Value ◽  
Intrinsic Rate Of Increase ◽  
Population Parameters ◽  
Age Classes ◽  
Model Species ◽  
Residual Reproductive Value ◽  
Rate Of Increase ◽  
Didelphis Aurita

A population of the black-eared opossum, Didelphis aurita Wied-Neuwied 1826, was studied during 1997-2006 by capture-mark-recapture in the Atlantic Forest in the state of Rio de Janeiro. Cohorts were established with females marked still in the pouch, classified into five age classes. Population parameters were estimated using life tables. Survival was type III and mortality was greatest in age classes I and II, just after weaning. Fecundity was inversely correlated with survival, reproductive value was inversely correlated with mortality and residual reproductive value was inversely correlated with fecundity. The intrinsic rate of increase was always close to zero and tended to be slightly negative. The black-eared opossum can be considered a good model species for this type of study.

Demography of Mythimna separata (Lepidoptera: Noctuidae) at outdoor fluctuating temperatures

2021 ◽  
pp. 1-9
Author(s):  
Bo-Liao Li ◽  
Mei-Mei Li ◽  
Tian-Tian Li ◽  
Jun-Xiang Wu ◽  
Xiang-Li Xu
Keyword(s):  
Larval Instar ◽  
Intrinsic Rate ◽  
Immature Stage ◽  
Early Summer ◽  
Intrinsic Rate Of Increase ◽  
Mythimna Separata ◽  
Rate Of Increase ◽  
Table Data ◽  
Lepidoptera Noctuidae ◽  
Fluctuating Temperatures

Abstract The oriental armyworm Mythimna separata (Walker) (Lepidoptera: Noctuidae) is a major migratory pest of cereal crops in East Asia, South Asia and Australia. To comprehensively understand the ecological tolerance of M. separata, we collected life table data of individuals from four consecutive generations reared under outdoor natural fluctuating temperatures from 15 April to 17 October 2018 in Yangling, Shaanxi, China. The results showed that the immature stage in early summer and summer were shorter than in spring and autumn. High mortality in late larval instar and pupal stages was observed in the summer generation. The adult pre-oviposition period in autumn was longer than the other seasons. The population in the earlier two seasons had heavier pupae and higher fecundity than the population in the latter two seasons. The intrinsic rate of increase and the finite rate of increase was the highest in early summer (r = 0.1292 day−1, λ = 1.1391 day−1), followed by spring (r = 0.1102 day−1, λ = 1.1165 day−1), and was the lowest in summer (r = 0.0281 day−1, λ = 1.0293 day−1). The results of this study would be useful to predict the population dynamics of M. separata and deepen our standing of the adaptiveness of this migratory pest in natural fluctuating ambient environments.

scholarly journals Demographic parameters of cowpea aphids on advanced semi-erect cowpea lines

2018 ◽  
Vol 53 (8) ◽  
pp. 900-908 ◽  
Author(s):  
Leandro Carvalho da Silva ◽  
Daniel Rodrigues Nere ◽  
Ervino Bleicher ◽  
Antônio Vinícius Correa Barbosa ◽  
Eraldo José Madureira Tavares
Keyword(s):  
Reproductive Potential ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Life Tables ◽  
Intrinsic Rate Of Increase ◽  
Demographic Parameters ◽  
Screening Assay ◽  
Finite Rate ◽  
Net Reproductive Rate ◽  
Rate Of Increase

Abstract: The objective of this work was to evaluate the resistance of advanced semi-erect cowpea (Vigna unguiculata) lines, by means of a screening assay for resistance and the elaboration of fertility-life tables of Aphis craccivora (Hemiptera: Aphididae). The experiments were carried out in a screenhouse. For the resistance trial, 15 advanced cowpea lines were used, as well as two standard genotypes for resistance and two for susceptibility, which were arranged in six blocks. After resistance was determined, two lines with the highest and lowest resistance were selected for the development of the fertility-life tables which were used to estimate demographic parameters. The MNCO4-762F-03 and MNCO4-762F-09 cowpea lines were classified as resistant, for which cowpea aphids showed the lowest values (in parentheses, respectively) for: net reproductive rate (RO = 3.0 and 2.5), intrinsic rate of increase (rm = 0.16 and 0.15), and finite rate of increase (λ = 1.18 and 1.16). The highest values were obtained for the 'Vita-7', MNCO4-795F-168, and 'BRS Tumucumaque' genotypes. The MNCO4-762F-03 and MNCO4-762F-09 lines show antibiosis-type resistance, which directly affects the reproductive potential of the cowpea aphid population.

BIOLOGY, LIFE TABLES, AND INTRINSIC RATE OF INCREASE OF THE EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE)

1981 ◽  
Vol 113 (1) ◽  
pp. 65-71 ◽  
Author(s):  
H. J. Herbert
Keyword(s):  
Intrinsic Rate ◽  
Life Tables ◽  
Panonychus Ulmi ◽  
Intrinsic Rate Of Increase ◽  
Threshold Temperature ◽  
Preoviposition Period ◽  
European Red Mite ◽  
Generation Times ◽  
Rate Of Increase ◽  
Net Reproduction

AbstractDevelopment of the European red mite, Panonychus ulmi (Koch), in Nova Scotia was studied at three constant temperatures to construct a life table and establish the intrinsic rate of development. The threshold temperature for development was 10.6°C. The duration from the beginning of the egg stage to adult for females was 31.2, 20.5, and 14.0 days and for males 21.9, 19.6, and 12.8 days at 15°, 18°, and 21°C, respectively. The duration in degree-days above 10.6°C for females was 137.3, 151.7, and 145.2 and for males 128.0, 144.9, and 133.1 at the same three temperatures. The duration of the preoviposition period decreased, duration of the oviposition period remained constant, and the number of eggs laid increased with temperature. Life tables were constructed at 15°, 18°, and 21°C; the intrinsic rates of increase were 0.56,.092, and.134; net reproduction rates 10.06, 13.50, and 17.37; and mean generation times were 41.4, 28.3, and 21.3 days, respectively.

scholarly journals Life-History Traits and Population Relative Fitness of Trichlorphon-Resistant and -SusceptibleBactrocera dorsalis(Diptera: Tephritidae)

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Zhang Yu-ping ◽  
Lu Yong-yue ◽  
Zeng Ling ◽  
Liang Guang-wen
Keyword(s):  
Resistant Strain ◽  
Intrinsic Rate ◽  
Life Tables ◽  
Susceptible Strain ◽  
Bactrocera Dorsalis ◽  
Relative Fitness ◽  
Intrinsic Rate Of Increase ◽  
Reproduction Rate ◽  
Rate Of Increase ◽  
Net Reproduction

Life tables were established for trichlorphon-resistant and susceptibleBactrocera dorsalisstrains based on the laboratory observations. Trichlorphon-resistantB. dorsalisstrain had longer pupal and preoviposition periods, and mean generation time compared to the trichlorphon susceptible strain. Lower fecundity, emergence rate, and probability of standard fecundityPF, and shorter female and male longevity also were apparent in the trichlorphon resistant strain. Based on the life tables, the life population trend index (I) of the resistant strain was 86.80, while that of the susceptible strain was 116.97. The net reproduction rate (R0) and the intrinsic rate of increase (rm) of the resistant strain were 1565.33 and 0.0164, while those of susceptible strain were 2184.00 and 0.0173, respectively. The results from this research revealed that the resistant strain was at a reproductive and developmental disadvantage relative to the susceptible strain.

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