scholarly journals Survey on Drosophila suzukii Natural Short-Term Dispersal Capacities Using the Mark−Release−Recapture Technique

Insects ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 268 ◽  
Author(s):  
Sandra Vacas ◽  
Jaime Primo ◽  
Juan J. Manclús ◽  
Ángel Montoya ◽  
Vicente Navarro-Llopis
Keyword(s):  
Fruit Fly ◽  
Flight Distance ◽  
Dispersal Ability ◽  
Drosophila Suzukii ◽  
Short Term ◽  
Dispersal Capacity ◽  
Mark Release Recapture ◽  
Dispersal Behavior ◽  
Flight Capacity ◽  
And Control

Spotted wing drosophila, Drosophila suzukii Matsumura (Diptera: Drosophilidae), has become a key pest for soft fruits and cherries in Europe in less than a decade since the first outbreak in 2007. Although this pest’s passive dispersal ability has been observed over more than 1400 km in 1 year, active spread has not yet been extensively studied. A mark−release−recapture (MRR) method based on protein-marked flies was employed to determine the flight capacity of D. suzukii. Sterile marked flies were released and recaptured in a trap grid at increasing distances from 10 to 250 m from the releasing point to study flight distance during periods ranging from 3 h to 1 week. MRR experiments were replicated in the presence and absence of host fruits to study how they could affect dispersal behavior. The dispersal capacity of the Mediterranean fruit fly, Ceratitis capitata Wiedemann (Diptera: Tephritidae) was also studied under the same conditions. The results showed a low dispersal ability for D. suzukii, with a daily flight distance below 100 m with no predominant wind. The implications on natural dispersion and control methods based on attractants are discussed.

scholarly journals Experimental Manipulation of Dispersal Ability in A Neotropical Butterfly Anartia fatima (Lepidoptera: Nymphalidae)

Insects ◽  
2018 ◽  
Vol 9 (3) ◽  
pp. 107 ◽  
Author(s):  
Robert Srygley
Keyword(s):  
Treatment Group ◽  
Flight Muscle ◽  
Experimental Manipulation ◽  
Group Differences ◽  
Dispersal Ability ◽  
Treatment Groups ◽  
Mark Release Recapture ◽  
And Control ◽  
Mass Allocation ◽  
Flight Muscle Ratio

Research on endangered British butterflies has found that butterfly populations in small refuges evolve to allocate more mass to the thorax (flight muscle) and less to the abdomen than populations in large refuges. The observed change in mass allocation affects two morphological features relevant to flight: the flight muscle ratio (FMR) and the position of center of body mass (cmbody). The author tested whether a decrease in FMR or a change in cmbody reduced the ability to disperse by experimentally weight-loading Neotropical Anartia fatima butterflies. In one treatment group, FMR was decreased but cmbody was not altered, whereas in the second group FMR was decreased and cmbody was repositioned further posterior. In one mark–release–recapture (MRR) experiment, butterflies dispersed relatively slowly, and treatment groups did not differ significantly. In a replicate experiment, butterflies dispersed more quickly, and control butterflies dispersed more rapidly than either treatment group. Differences in dispersal were consistent with a causal relationship between FMR and movement. A more posterior cmbody had little effect on dispersal beyond that due to the change in FMR. These results support the hypothesis that an increase in mass allocation to the thorax in small, dispersed refugia is due to selection on the ability to disperse.

scholarly journals Flight capacity increases then declines from the core to the margins of an invasive species' range

2019 ◽  
Vol 15 (11) ◽  
pp. 20190496 ◽  
Author(s):  
Andrew C. Merwin
Keyword(s):  
Invasive Species ◽  
Maternal Effects ◽  
Common Garden ◽  
Spatial Proximity ◽  
Dispersal Ability ◽  
Suitable Habitat ◽  
Dispersal Capacity ◽  
The Core ◽  
Spatial Sorting ◽  
Flight Capacity

Individuals that disperse farther than other individuals are more likely to be on the frontlines of spreading populations and may be more likely to mate with one another as a consequence of their spatial proximity. Over generations, this process—known as spatial sorting—can produce patterns of increasing dispersal ability from a population's core towards the spreading front. By contrast, when the spread of a population is limited by the availability of suitable habitat, theory predicts that range boundaries can select against more dispersive phenotypes and produce patterns of decreasing dispersal capacity towards population margins. In a common garden study of invasive kudzu bugs ( Megacopta cribraria )—which are limited by the availability of hostplants in their southern and western margins—I show that midrange individuals fly 49% farther than individuals in the core and 37% farther than individuals at margins. This result highlights that other processes, such as maternal effects or selection at range boundaries, may create more complicated patterns of dispersal ability across landscapes than predicted by models of spatial sorting alone.

Sweeping the flies away: evidence from a fruit fly eradication program

2020 ◽  
Vol 47 (5) ◽  
pp. 1920-1962
Author(s):  
Lina Salazar ◽  
Julian Aramburu ◽  
Marcos Agurto ◽  
Alessandro Maffioli ◽  
Jossie Fahsbender
Keyword(s):  
Pest Management ◽  
Prevention And Control ◽  
Regression Discontinuity ◽  
Fruit Fly ◽  
Fruit Production ◽  
Management Program ◽  
Regression Discontinuity Design ◽  
Short Term ◽  
Pre Treatment ◽  
And Control

Abstract This article evaluates the short-term impacts of a fruit fly integrated pest management program in Peru. Exploiting arbitrary variation in the program’s intervention borders, we use a geographical regression discontinuity design to identify the program’s effects on agricultural outcomes. Pre-treatment balance tests show that producer and farm-level pre-treatment characteristics evolve smoothly at the intervention border. Results indicate that farmers within treated areas improved pest knowledge and are more likely to implement prevention and control practices. Also, they increased fruit production and sales. Our findings are confirmed by placebo tests and are robust to alternative regression discontinuity bandwidths and polynomials.

Guava (Psidium guajava L.) Fruit Coating with Gum – Arabic for Quality and Fruit Fly Control

1970 ◽  
pp. 01-04
Author(s):  
Esameldin B. M. Kabbashi, Ghada H. Abdelrahman and Nawal A. Abdlerahman
Keyword(s):  
Shelf Life ◽  
Gum Arabic ◽  
Fruit Fly ◽  
Psidium Guajava ◽  
Postharvest Quality ◽  
Guava Fruit ◽  
Fruit Shelf Life ◽  
Fly Control ◽  
And Control ◽  
Subtropical Fruit

Guava (Psidium guajava L.) is a lovely tropical and subtropical fruit that originates in Mexico, Central America, and then taken to other distant and near parts around the world. In Sudan this popular fruit is produced in orchards and household and is so profitable but yet attacked by a lot of fruit fly species of the Genera Ceratitis and Bactrocera and the result is a loss of more than 70%. This research aimed at evaluating the effect of Gum Arabic coating (GAC) in extending the shelf life of guava fruit and disinfesting it from these notorious pests. Guava fruits from Kadaro orchards, Khartoum North, were tested using seven concentrations of Gum Arabic solutions. The results reflect that 1: 4 (25%) and 1: 8 (12.5%) (GA: water) concentrations attained 56 and 40% disinfestation, respectively whereas the other lower concentrations effected corresponding results in a range from 20 – 08%. The reduction in maggots per test fruit reached upto 188% as compared to the control.  The highest concentrations (1: 4 & 1: 8) effected a sustainability of 52% in fruit firmness (FF) with an average of medium (3) FF compared to soft FF (4) in the control. The corresponding results in other lower concentrations (1: 16; 1: 32; 1: 64; 1: 72 & 1: 96) were 36, 24, 24, 20 and 16%, respectively. In addition to an average FF of 4 (soft) for all these concentrations and 5 (very soft) for all the corresponding controls. Nevertheless, the sustainability of fruit color (FC) effected by the test concentrations was 52, 44, 24, 22, 24, 20, and 24%, respectively. Regarding these results, the two highest test concentrations effected a sizeable disinfestation and control of fruit flies and a good extension of shelf life of guava in Khartoum State. These findings support using this treatment as an effective IPM tool to extend guava fruit shelf life and upgrading its postharvest quality.

scholarly journals Bioimpedance Guided Fluid Management in Peritoneal Dialysis

2020 ◽  
Vol 15 (5) ◽  
pp. 685-694 ◽  
Author(s):  
Na Tian ◽  
Xiao Yang ◽  
Qunying Guo ◽  
Qian Zhou ◽  
Chunyan Yi ◽  
...  
Keyword(s):  
Peritoneal Dialysis ◽  
Patient Survival ◽  
Fluid Management ◽  
Volume Overload ◽  
Short Term ◽  
Cardiovascular Disease Mortality ◽  
Technique Survival ◽  
Disease Mortality ◽  
Clinical Methods ◽  
And Control

Background and objectivesBioelectrical impedance analysis (BIA) devices can help assess volume overload in patients receiving maintenance peritoneal dialysis. However, the effects of BIA on the short-term hard end points of peritoneal dialysis lack consistency. This study aimed to test whether BIA-guided fluid management could improve short-term outcomes in patients on peritoneal dialysis.Design, setting, participants, & measurementsA single-center, open-labeled, randomized, controlled trial was conducted. Patients on prevalent peritoneal dialysis with volume overload were recruited from July 1, 2013 to March 30, 2014 and followed for 1 year in the initial protocol. All participants with volume overload were 1:1 randomized to the BIA-guided arm (BIA and traditional clinical methods) and control arm (only traditional clinical methods). The primary end point was all-cause mortality and secondary end points were cardiovascular disease mortality and technique survival.ResultsA total of 240 patients (mean age, 49 years; men, 51%; diabetic, 21%, 120 per group) were enrolled. After 1-year follow-up, 11(5%) patients died (three in BIA versus eight in control) and 21 patients were permanently transferred to hemodialysis (eight in BIA versus 13 in control). The rate of extracellular water/total body water decline in the BIA group was significantly higher than that in the control group. The 1-year patient survival rates were 96% and 92% in BIA and control groups, respectively. No significant statistical differences were found between patients randomized to the BIA-guided or control arm in terms of patient survival, cardiovascular disease mortality, and technique survival (P>0.05).ConclusionsAlthough BIA-guided fluid management improved the fluid overload status better than the traditional clinical method, no significant effect was found on 1-year patient survival and technique survival in patients on peritoneal dialysis.

scholarly journals EcoRacer: Game-Based Optimal Electric Vehicle Design and Driver Control Using Human Players

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Yi Ren ◽  
Alparslan Emrah Bayrak ◽  
Panos Y. Papalambros
Keyword(s):  
Optimization Problem ◽  
Solution Space ◽  
Efficient Global Optimization ◽  
Vehicle Design ◽  
Control Problems ◽  
Short Term ◽  
Algorithm Efficiency ◽  
Np Complete ◽  
And Control

We compare the performance of human players against that of the efficient global optimization (EGO) algorithm for an NP-complete powertrain design and control problem. Specifically, we cast this optimization problem as an online competition and received 2391 game plays by 124 anonymous players during the first month from launch. We found that while only a small portion of human players can outperform the algorithm in the long term, players tend to formulate good heuristics early on that can be used to constrain the solution space. Such constraining of the search enhances algorithm efficiency, even for different game settings. These findings indicate that human-assisted computational searches are promising in solving comprehensible yet computationally hard optimal design and control problems, when human players can outperform the algorithm in a short term.

Retrospective Analysis of Tobacco Control Measures and Policies in China

2021 ◽  
Vol 7 (4) ◽  
pp. 295-299
Author(s):  
Lian He ◽  
Xiaoxin Chen ◽  
Chunzi Shao
Keyword(s):  
Tobacco Control ◽  
Control Period ◽  
Control Measures ◽  
Chinese Government ◽  
Consumption Tax ◽  
Short Term ◽  
Tax Rate ◽  
Effective Role ◽  
Regulatory Measures ◽  
And Control

Objectives: Tobacco control measures can be divided into three types: regulatory, economic, and informational respectively. This paper focuses on the role and effect of different types of tobacco control measures during the epidemic prevention and control period in China. Conclusion: Firstly, as strong and powerful measures, economic measures can significantly reduce cigarette sales in the short term. However, the Chinese government did not adjust the cigarette consumption-tax rate during the period. Economic measures thus did not play an important role. Secondly, Due to few people in public places and workplaces, regulatory measures were "out of effect" in a short term. Therefore, there were insufficient evidence to find out whether regulatory measures are effective or not. Finally, China's tobacco production increased slightly during this period. This reflected that informational measures did not play an effective role.

scholarly journals Reading comprehension on the last grades of cicles I and II of elementary school

CoDAS ◽  
2014 ◽  
Vol 26 (4) ◽  
pp. 276-285
Author(s):  
Eliane Mi Chang ◽  
Clara Regina Brandão de Avila
Keyword(s):  
Working Memory ◽  
Elementary School ◽  
Reading Comprehension ◽  
Research Groups ◽  
Control Groups ◽  
Short Term ◽  
Good Readers ◽  
Spearman Coefficient ◽  
Positive Correlations ◽  
And Control

PURPOSE: To characterize students' performance in Cycle I and II of the Elementary School (EF), in decoding, reading comprehension and underlying skills of reading, and investigate correlations between these variables, in the absence and presence of reading comprehension deficits, identified by their teachers.METHODS: 125 students from ES were grouped according to Cycle and presence or absence of reading comprehension impairments. Two Control (good readers from both Cycles) and two Research groups (poor readers from both Cycles) were established. Assessment involved: fluency and reading comprehension; oral comprehension; working and short-term phonological memory; grammar closure. It was compared (Mann-Whitney test): in intragroup study, both Control and Research groups; in intergroup study, Control and Research from different cycles, and Control I and Research II. Spearman coefficient investigated correlations.RESULTS: Analyzing reading comprehension, we observed better performance of Control Groups in all tasks in comparison to the respective Research Groups, and better performance of Control II in comparison to Control I. Research Groups had similar results in most tests. Positive correlations have been observed between most of the variables.CONCLUSION: Students without reading comprehension impairments showed better performance in reading in both Cycles. Working memory and oral comprehension did not differentiate students with and without complaints in Cycle I, differently from what was observed in Cycle II. Research II presented similar or better performance than Research I and similar or worse performance than Control I. Underlying skills showed different profiles of correlation with reading comprehension capacity, according to the group.

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