THE RELATION BETWEEN DISPERSAL BEHAVIOR AND REPRODUCTIVE FITNESS IN THE FLOUR BEETLE TRIBOLIUM CASTANEUM

1978 ◽  
Vol 20 (4) ◽  
pp. 589-595 ◽  
Author(s):  
Batia Lavie ◽  
Uzi Ritte
Keyword(s):  
Tribolium Castaneum ◽  
Correlation Coefficients ◽  
Developmental Time ◽  
Reproductive Fitness ◽  
Fitness Component ◽  
Flour Beetle ◽  
High Dispersal ◽  
Dispersal Behavior ◽  
The Relationship ◽  
Successful Colonization

Assuming that dispersal from optimal environments evolved as a colonizing device, it is expected that dispersants will possess reproductive characteristics enhancing the probability of successful colonization. Two approaches were used to clarify the relationship between dispersal behavior and two major components of reproductive fitness (developmental time and fecundity) in the flour beetle Tribolium castaneum: (a) comparison between two lines, one selected for low dispersal and the other selected for high dispersal, for several components of reproductive fitness, and (b) calculation of the correlation coefficients between each fitness component investigated and dispersal behavior. The results obtained by both approaches indicate, as expected, shorter developmental time and higher fecundity for dispersants than for nondispersants.

scholarly journals REPAIR OF X-IRRADIATION DAMAGE IN TRIBOLIUM CASTANEUM STRAINS SELECTED FOR DIFFERENCES IN DEVELOPMENTAL RATES

Genetics ◽  
1974 ◽  
Vol 78 (3) ◽  
pp. 897-904
Author(s):  
M Hani Soliman
Keyword(s):  
Tribolium Castaneum ◽  
Developmental State ◽  
Developmental Time ◽  
Irradiation Damage ◽  
Cell Cycle Protein ◽  
Slowing Down ◽  
Developmental Rates ◽  
X Irradiation ◽  
The Difference ◽  
The Relationship

ABSTRACT Lines previously selected for different speed of development were found to differ in their spontaneous and induced wing abnormalities after single exposure to X-ray (10 KR) in Tribolium castaneum at 33° and 70% relative humidity. At the time of irradiation the mean developmental time (from egg to first day pupa) was 16.9, 18.8, 22.8 and 18.4 days for fast, intermediate, slow and unselected lines, respectively. There was no difference between males and females in their responses. The spontaneous rate (angular values) of wing abnormalities was 5.3%, 11.2%, 3.5% and 7.2%, and the corresponding induced values were 16.7%, 20.5%, 11.7% and 25.2% for fast, intermediate, slow and unselected lines, respectively. The difference between the spontaneous (due to selection) and the induced (due to selection and irradiation) rates indicates that slowing down development will probably increase the efficiency of the repair of the irradiation damage. This difference (angular values) was 11.4%, 9.4% and 8.1% for fast, intermediate and slow lines, respectively. Increasing developmental time by one day resulted in repairing 0.56% of the radiation damage. These results indicate that both the genetic and the developmental state of the line influence both induction and repair of the X-irradiation damage. The relationship between development, cell cycle, protein synthesis and repair is discussed.

CORRELATED RESPONSE TO NATURAL SELECTION IN LABORATORY POPULATIONS OF TRIBOLIUM CASTANEUM

1972 ◽  
Vol 14 (4) ◽  
pp. 971-978 ◽  
Author(s):  
M. Hani Soliman
Keyword(s):  
Natural Selection ◽  
Tribolium Castaneum ◽  
Correlation Coefficients ◽  
Developmental Time ◽  
Correlated Response ◽  
Larval Weight ◽  
Laboratory Populations ◽  
Old Adult

Intra- and interpopulation correlations between productivity and period of productivity were significant. One-day-old pupae and one-day-old adult weights were not associated with productivity. The intrapopulation correlation coefficients between productivity and developmental time were found to be significant. However, all of them (except one) were negative. Significant interpopulation relationships were noted when productivity was correlated with 13-day larval weight and with developmental time. Positive and negative correlations were found between productivity-larval weight and productivity-developmental time, respectively. It is concluded that developmental time is the most important factor in controlling productivity in T. castaneum under the constant conditions of the present investigation.

scholarly journals Effect of Iron Fortified Wheat Flour on the Biology and Physiology of Red Flour Beetle, Tribolium castaneum (Herbst)

2010 ◽  
Vol 2 ◽  
pp. IJIS.S5200 ◽  
Author(s):  
Sohail Ahmed ◽  
Waqas Wakil ◽  
H.M. Salman Saleem ◽  
Mohammad Shahid ◽  
M. Usman Ghazanfar
Keyword(s):  
Tribolium Castaneum ◽  
First Generation ◽  
Larval Mortality ◽  
Developmental Time ◽  
Red Flour Beetle ◽  
Control Treatment ◽  
Larval Weight ◽  
Flour Beetle ◽  
Fortified Flour ◽  
And Control

Iron overload in the fortified flour can influence the life stages and physiology of the insects. The present study was carried out to evaluate the effect of commercially available premix iron fortified flour as well as effect of different concentrations of post-mix iron fortified flour (30–5 ppm) on biology of red flour beetle, Tribolium castaneum (Hebrst.). Larval and pupal duration, total developmental time, fecundity and larval weights in two consecutive generations of beetle were compared with control treatment. Amylase and protease activities of gut of the beetle were also measured in premix and postmix flours. Results showed that larval mortality increased in two sources of premix iron flour when compared with control. Larval weight was reduced in first generation only. The larval mortality was significantly higher in 30 ppm postmix iron fortified flour than in other postmix concentrations and control treatment. The larvae of T. castaneum fed on two sources of premix and in various concentrations of postmix iron fortified flour revealed an increase in amylases and decrease in protease activities.

Reliability of the Minimum Masking Level as Outcome Variable in Tinnitus Clinical Research

2020 ◽  
Vol 29 (3) ◽  
pp. 429-435
Author(s):  
Patricia C. Mancini ◽  
Richard S. Tyler ◽  
Hyung Jin Jun ◽  
Tang-Chuan Wang ◽  
Helena Ji ◽  
...  
Keyword(s):  
Standard Deviation ◽  
High Frequency ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Outcome Variable ◽  
Reliable Estimate ◽  
Moderate Correlation ◽  
Trained Subjects ◽  
The Relationship ◽  
Minimum Intensity

Purpose The minimum masking level (MML) is the minimum intensity of a stimulus required to just totally mask the tinnitus. Treatments aimed at reducing the tinnitus itself should attempt to measure the magnitude of the tinnitus. The objective of this study was to evaluate the reliability of the MML. Method Sample consisted of 59 tinnitus patients who reported stable tinnitus. We obtained MML measures on two visits, separated by about 2–3 weeks. We used two noise types: speech-shaped noise and high-frequency emphasis noise. We also investigated the relationship between the MML and tinnitus loudness estimates and the Tinnitus Handicap Questionnaire (THQ). Results There were differences across the different noise types. The within-session standard deviation averaged across subjects varied between 1.3 and 1.8 dB. Across the two sessions, the Pearson correlation coefficients, range was r = .84. There was a weak relationship between the dB SL MML and loudness, and between the MML and the THQ. A moderate correlation ( r = .44) was found between the THQ and loudness estimates. Conclusions We conclude that the dB SL MML can be a reliable estimate of tinnitus magnitude, with expected standard deviations in trained subjects of about 1.5 dB. It appears that the dB SL MML and loudness estimates are not closely related.

A Meta Analytic Review of the Relationship between Emotional Intelligence and Leadership Effectiveness

2019 ◽  
Vol 118 (9) ◽  
pp. 118-126
Author(s):  
Augusty P. A ◽  
Jain Mathew
Keyword(s):  
Systematic Review ◽  
Emotional Intelligence ◽  
Direct Relationship ◽  
Effective Leadership ◽  
Leadership Effectiveness ◽  
Meta Analysis ◽  
Correlation Coefficients ◽  
Review Of Literature ◽  
Analytic Review ◽  
The Relationship

The study evaluates the relationship between Emotional Intelligence and Leadership Effectiveness through a Systematic Review of Literature. The relationship has been evaluated in two steps. First, a Systematic review of literature was done to provide a theoretical framework to link the dimensions of Emotional Intelligence to the elements of effective leadership. Meta-analysis was then used to consolidate empirical evidence of the relationship. The studies for the meta-analysis were sourced from Pro Quest and EBSCO and the correlation coefficients of the studies were analysed. Only articles that presented the direct relationship between the variables were included in the study. The results of the analysis revealed a strong, statistically significant relationship between emotional intelligence and effective leadership. The findings of the study provide evidence for the proposition that Emotional Intelligence and Leadership Effectiveness are interrelated.

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