A TEMPERATURE- AND AGE-DEPENDENT SIMULATION MODEL OF REPRODUCTION FOR THE NORTHERN CORN ROOTWORM, DIABROTICA BARBERI SMITH AND LAWRENCE (COLEOPTERA: CHRYSOMELIDAE)

1988 ◽  
Vol 120 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Steven E. Naranjo ◽  
Alan J. Sawyer
Keyword(s):  
Variable Temperature ◽  
Developmental Rate ◽  
Reproductive Stage ◽  
Physiological Age ◽  
Distribution Models ◽  
Diabrotica Barberi ◽  
Temperature Regimes ◽  
Age Dependent ◽  
Dependent Model ◽  
Independent Distribution

AbstractBased on data collected at seven constant temperatures, a temperature- and age-dependent model for reproductive development and oviposition by Diabrotica barberi Smith and Lawrence was developed. The model couples temperature-dependent rate and temperature-independent distribution models to represent the observed variability in developmental times for pre-reproductive, reproductive, and post-reproductive females. Using a cohort approach to maintain a physiological age structure, development was coupled with a temperature- and age-dependent model of oviposition. The model was validated at one constant-temperature and three variable-temperature regimes in the laboratory. The time spent in the pre-reproductive stage was slightly underestimated by the model, but the development of mature females and both the timing and magnitude of oviposition under fluctuating-temperature regimes were accurately predicted. The model was relatively insensitive to errors in estimation of the rate of development in the pre-reproductive stage but sensitive to errors in estimation of developmental rate of the reproductive stage and fecundity. Errors in input temperatures were found to be very important, stressing the need for accurately measuring temperature, The major driving variable. The model should be a valuable aid toward understanding oviposition by D. barberi in the field.

scholarly journals Rice cold tolerance at the reproductive stage in a controlled environment

2006 ◽  
Vol 63 (3) ◽  
pp. 255-261 ◽  
Author(s):  
Renata Pereira da Cruz ◽  
Sandra Cristina Kothe Milach ◽  
Luiz Carlos Federizzi
Keyword(s):  
Cold Tolerance ◽  
Oryza Sativa L ◽  
Variable Temperature ◽  
Reproductive Stage ◽  
Spikelet Fertility ◽  
High Yield ◽  
Cold Temperatures ◽  
Cold Tolerant ◽  
Rice Genotypes ◽  
Highly Correlated

Cold tolerance of rice (Oryza sativa L.) during the reproductive stage is important to guarantee high yield under low temperature environments. Field selection, however, does not allow identification of adequate tolerance sources and limits selection of segregating lines due to variable temperature. The objective of this study was to devise methods for distinguishing rice genotypes as to their cold tolerance at the reproductive stage when evaluated under controlled temperature. The effect of cold temperatures was investigated in six rice genotypes at 17°C for varying length of time (three, five, seven and ten days) at two reproductive stages (microsporogenesis and anthesis). Cold tolerance was measured as the percentage of reduction in panicle exsertion and in spikelet fertility. Evaluating cold tolerance through the reduction in panicle exsertion did not allow for the distinction between cold tolerant from cold sensitive genotypes and, when the reduction in spikelet fertility was considered, a minimum of seven days was required to differentiate the genotypes for cold tolerance. Genotypes were more sensitive to cold at anthesis than at microsporogenesis and, as these stages were highly correlated, cold screening could be performed at anthesis only, since it is easier to determine. Rice cold tolerance at the reproductive stage may be characterized by the reduction in spikelet fertility due to cold temperature (17°C) applied for seven days at anthesis.

scholarly journals Impact of Constant Versus Fluctuating Temperatures on the Development and Life History Parameters of Aldrichina grahami (Diptera: Calliphoridae)

Insects ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 184 ◽  
Author(s):  
Wei Chen ◽  
Li Yang ◽  
Lipin Ren ◽  
Yanjie Shang ◽  
Shiwen Wang ◽  
...  
Keyword(s):  
Life History ◽  
Ambient Temperature ◽  
Developmental Rate ◽  
Threshold Temperature ◽  
Life History Parameters ◽  
Temperature Regimes ◽  
Cold Tolerant ◽  
Constant Versus ◽  
Forensic Tools ◽  
Fluctuating Temperatures

Necrophagous fly species are commonly used as forensic tools to estimate the minimum postmortem interval (PMImin). Many researchers raised necrophagous flies under constant temperature regimes to collect their developmental data. However, in most forensic cases, the ambient temperature fluctuates. In order to investigate a forensically important fly developmental mode (the Isomegalen diagram, Isomorphen diagram and Thermal summation models) and make comparisons of the developmental rate between constant temperatures and fluctuating temperatures, we used Aldrichina grahami (Diptera: Calliphoridae) to investigate the life history parameters at eight constant temperatures ranging from 8 to 36 °C. We also compared developmental rate of A. grahami in three groups of constant versus fluctuating temperatures: 8 °C vs. 6–12 °C, 12 °C vs. 10–16 °C, and 16 °C vs. 14–20 °C. Our data showed that A. grahami is cold tolerant with a mean (±SE) development threshold temperature (D0) of 3.41 ± 0.48 °C and a thermal summation constant (K) of 8125.2 ± 288.4-degree hours. The three groups subjected to fluctuating temperatures took longer to develop compared to those developing in constant temperatures when simulated in a model. These results not only provide detailed developmental data for the use of A. grahami in the estimation of the PMI, but also indicate that ambient temperature fluctuation must be taken into consideration for the use of all necrophagous fly species.

scholarly journals The Potential of AGE MODE, an Age-Dependent Model, to Estimate Usual Intakes and Prevalences of Inadequate Intakes in a Population

2006 ◽  
Vol 136 (11) ◽  
pp. 2916-2920 ◽  
Author(s):  
Patricia M. C. M. Waijers ◽  
Arnold L. M. Dekkers ◽  
Jolanda M. A. Boer ◽  
Hendriek C. Boshuizen ◽  
Caroline T. M. van Rossum
Keyword(s):  
Age Dependent ◽  
Dependent Model

scholarly journals Proteomic Signatures of Corals from Thermodynamic Reefs

2020 ◽  
Vol 8 (8) ◽  
pp. 1171
Author(s):  
Anderson B. Mayfield
Keyword(s):  
Molecular Mechanisms ◽  
Elevated Temperatures ◽  
Variable Temperature ◽  
Deep South ◽  
Lipid Trafficking ◽  
Reef Corals ◽  
Temperature Conditions ◽  
Temperature Regimes ◽  
Unique Nature ◽  
Seriatopora Hystrix

Unlike most parts of the world, coral reefs of Taiwan’s deep south have generally been spared from climate change-induced degradation. This has been linked to the oceanographically unique nature of Nanwan Bay, where intense upwelling occurs. Specifically, large-amplitude internal waves cause shifts in temperature of 6–9 °C over the course of several hours, and the resident corals not only thrive under such conditions, but they have also been shown to withstand multi-month laboratory incubations at experimentally elevated temperatures. To gain insight into the sub-cellular basis of acclimation to upwelling, proteins isolated from reef corals (Seriatopora hystrix) featured in laboratory-based reciprocal transplant studies in which corals from upwelling and non-upwelling control reefs (<20 km away) were exposed to stable or variable temperature regimes were analyzed via label-based proteomics (iTRAQ). Corals exposed to their “native” temperature conditions for seven days (1) demonstrated highest growth rates and (2) were most distinct from one another with respect to their protein signatures. The latter observation was driven by the fact that two Symbiodiniaceae lipid trafficking proteins, sec1a and sec34, were marginally up-regulated in corals exposed to their native temperature conditions. Alongside the marked degree of proteomic “site fidelity” documented, this dataset sheds light on the molecular mechanisms underlying acclimatization to thermodynamically extreme conditions in situ.

Exposure Reconstruction for the TCDD-Exposed NIOSH Cohort Using a Concentration- and Age-Dependent Model of Elimination

Risk Analysis ◽  
2005 ◽  
Vol 25 (4) ◽  
pp. 945-956 ◽  
Author(s):  
Lesa L. Aylward ◽  
Robert C. Brunet ◽  
Thomas B. Starr ◽  
Gaetan Carrier ◽  
Elizabeth Delzell ◽  
...  
Keyword(s):  
Age Dependent ◽  
Dependent Model

scholarly journals Energy Cost Expression for a Youth Compendium of Physical Activities: Rationale for Using Age Groups

2018 ◽  
Vol 30 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Karin A. Pfeiffer ◽  
Kathleen B. Watson ◽  
Robert G. McMurray ◽  
David R. Bassett ◽  
Nancy F. Butte ◽  
...  
Keyword(s):  
Age Groups ◽  
Physical Activities ◽  
Physical Activity Energy Expenditure ◽  
Age Dependency ◽  
Metabolic Equivalent ◽  
Mean Values ◽  
Age Dependent ◽  
Dependent Model ◽  
Vigorous Intensity ◽  
Activity Energy

Purpose:This study compared the accuracy of physical activity energy expenditure (PAEE) prediction using 2 methods of accounting for age dependency versus 1 standard (single) value across all ages.Methods:PAEE estimates were derived by pooling data from 5 studies. Participants, 6–18 years (n = 929), engaged in 14 activities while in a room calorimeter or wearing a portable metabolic analyzer. Linear regression was used to estimate the measurement error in PAEE (expressed as youth metabolic equivalent) associated with using age groups (6–9, 10–12, 13–15, and 16–18 y) and age-in-years [each year of chronological age (eg, 12 = 12.0–12.99 y)] versus the standard (a single value across all ages).Results:Age groups and age-in-years showed similar error, and both showed less error than the standard method for cycling, skilled, and moderate- to vigorous-intensity activities. For sedentary and light activities, the standard had similar error to the other 2 methods. Mean values for root mean square error ranged from 0.2 to 1.7 youth metabolic equivalent across all activities. Error reduction ranged from −0.2% to 21.7% for age groups and −0.23% to 18.2% for age-in-years compared with the standard.Conclusions:Accounting for age showed lower errors than a standard (single) value; using an age-dependent model in the Youth Compendium is recommended.

SIMULATION OF TEMPERATURE-DEPENDENT DEVELOPMENT IN POPULATION DYNAMICS MODELS

1975 ◽  
Vol 107 (11) ◽  
pp. 1167-1174 ◽  
Author(s):  
R. E. Stinner ◽  
G. D. Butler ◽  
J. S. Bacheler ◽  
C. Tuttle
Keyword(s):  
Population Dynamics ◽  
Trichoplusia Ni ◽  
Variable Temperature ◽  
Heliothis Zea ◽  
Anthonomus Grandis ◽  
Temperature Dependent ◽  
Dependent Development ◽  
Temperature Regimes ◽  
Population Dynamics Models ◽  
Dynamics Models

AbstractThe simulation of variability in temperature-dependent development is discussed. An algorithm for simulation of this variability is developed and validated under constant and variable temperature regimes for Anthonomus grandis, Trichoplusia ni, and Heliothis zea.

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