Investigating Population Dynamics and Sex Structure of Exolontha castanea Chang (Coleoptera: Melolonthidae) Using Light Traps in Sugarcane Fields in China

Sugar Tech ◽  
2022 ◽  
Author(s):  
Xian-kun Shang ◽  
Ji-li Wei ◽  
Wei Liu ◽  
Xue-hong Pan ◽  
Cheng-hua Huang ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Light Traps ◽  
Sex Structure

scholarly journals Population dynamics in northwestern China

2021 ◽  
Author(s):  
Xueyan Yang ◽  
Wanxin Li ◽  
Wen Jing ◽  
Chezhuo Gao ◽  
Rui Li ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
Population Size ◽  
Ethnic Groups ◽  
Northwestern China ◽  
Average Level ◽  
Han Population ◽  
Sex Structure ◽  
Biological Sex

AbstractThis article analyzes the population dynamics in northwestern China from roughly 2010 to 2020. The area’s dynamics showed a slow, stable increase in population size, a stable increase in the population of non-Han ethnic groups, which increased at a more rapidly than the Han population, and population rejuvenation coupled with a population structure that aged. The biological sex structure fluctuated within a balanced range in northwestern China. Urbanization advanced in northwestern China, throughout this period, but the area’s level of urbanization is still significantly lower than the average level of urbanization nationally.

Population Dynamics Among the Totos of West Bengal: A Positive Response to Culture Contact

1983 ◽  
Vol 15 (2) ◽  
pp. 237-245 ◽  
Author(s):  
Debasish Sinha ◽  
Bikas Chandra Pal
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
Death Rate ◽  
Birth Rate ◽  
West Bengal ◽  
Positive Response ◽  
Developmental Change ◽  
Demographic Data ◽  
Culture Contact ◽  
Sex Structure

SummaryThe population structure of the Toto tribe at Totopara, a small village in West Bengal, District Jalpaiguri, was studied, for since 1951 the Totos have been coming more and more in contact with the outside world and undergoing a process of cultural and developmental change. Demographic data presented include the age-sex structure, marital status, fertility, birth rate, death rate and population growth trends in the pre-contact and contact era. At present the population shows a trend towards increase.

Rice Water Weevil (Coleoptera: Curculionidae) Population Dynamics in Louisiana

2004 ◽  
Vol 39 (4) ◽  
pp. 623-642 ◽  
Author(s):  
Hanwu Shang ◽  
Michael J. Stout ◽  
Zhitao Zhang ◽  
Jiaan Cheng
Keyword(s):  
Population Dynamics ◽  
Growing Season ◽  
Research Station ◽  
Light Traps ◽  
Lissorhoptrus Oryzophilus ◽  
Ratoon Crop ◽  
Rice Water Weevil ◽  
Louisiana State University ◽  
Flight Muscles ◽  
Rice Water

The rice water weevil, Lissorhoptrus oryzophilus Kuschel, has long been an important pest of rice in the U.S. and has recently emerged as a pest of rice in Asia. A systematic study of the life history and population dynamics of this insect was conducted during the 2002 growing season at the Louisiana State University Rice Research Station, Crowley, Acadia Parish, LA, an area where it is a particularly severe pest. By monitoring weevil populations using collections from overwintering sites, from plots of rice planted throughout the growing season, and from light traps, and by dissecting collected weevils to assess the conditions of their fat bodies, flight muscles and ovaries, we concluded that a portion of the weevil population in Louisiana is univoltine, another portion is bivoltine, and another portion may pass through multiple generations if young rice is continually available. However, only one generation of weevils developed in a single rice field. Adult weevils invaded rice fields in apparently large numbers prior to flooding. Weevils possessing both well-developed ovaries and well-developed flight muscles were found in both light traps and rice plots, suggesting that adults were capable of seeking new habitats by flying if rice plants were not suitable for oviposition. Weevils were able to complete a generation on ratoon-crop rice. The emergence of overwintered weevils started in late March, with peak emergence occurring during April and May. Return to overwintering sites began in early June and continued until October. Weevils appeared to move among overwintering habitats. A comparison of weevil population dynamics in rice plots planted on different dates supported the use of early planting as a management strategy.

Population dynamics of the sugarcane borer, Eldana saccharina Walker (Lepidoptera: Pyralidae), in Natal, South Africa

1989 ◽  
Vol 79 (1) ◽  
pp. 61-80 ◽  
Author(s):  
P. R. Atkinson ◽  
A. J. M. Carnegie
Keyword(s):  
South Africa ◽  
Population Dynamics ◽  
Predictive Model ◽  
Population Change ◽  
Lower Mortality ◽  
Eldana Saccharina ◽  
Natural Mortality ◽  
Light Traps ◽  
Climatic Indices ◽  
Lepidoptera Pyralidae

AbstractInfestations of the sugarcane pest Eldana saccharina Walker have been consistently serious in one part of the cane-growing belt of Natal, South Africa. Mortality in this region over seven years was estimated from moth catches in light traps, checked against population change measured from extensive larval counts, and plotted against climatic indices. The object was to construct a predictive model to illustrate mortality in other regions of the cane belt, to which infestations have spread in recent years. The spread southwards along the coast did not seem to have resulted from a decrease in natural mortality, but the spread to higher altitudes appeared to be due to lower mortality associated with warmer and drier years. The phenology of the insect and the effect of the annual harvesting cycle on phenology are discussed.

scholarly journals Emigration activity of the saw-toothed grain beetle Oryza Philus Surinamensis L. (Coleoptera: Silvanidae) in various environmental temperatures

2012 ◽  
Vol 52 (4) ◽  
pp. 397-400 ◽  
Author(s):  
Małgorzata Kłyś
Keyword(s):  
Population Dynamics ◽  
Relative Humidity ◽  
Optimum Temperature ◽  
Oryzaephilus Surinamensis ◽  
Air Humidity ◽  
Sex Structure ◽  
Total Inhibition ◽  
Relative Air Humidity ◽  
Environmental Temperatures ◽  
Very High

Abstract The study pertained to the saw-toothed grain beetle Oryzaephilus surinamensis L., a dangerous pest of stored food products. The studies were carried out in the laboratory. Thermostats were set at a temperature of 31°C; an optimum temperature for this insect species, and in temperatures lowered to 28 and 22°C. The relative air humidity was kept at 60 ±5% relative humidity (RH). The main topic of the study was to examine the effect of lower temperatures in the environment, on the emigration activity of O. surinamensis. In these conditions, the population dynamics and the sex structure in O. surinamensis populations were also studied. The saw-toothed grain beetle was found to display very high emigration activity at 31 and 28°C. Lowering the temperature to 22°C caused a decrease in emigration activity and total inhibition of emigration activity until the 120th day of the experiment. A higher emigration levels among females rather than males, was also observed.

scholarly journals Monitoring and detection of the swede midge (Diptera: Cecidomyiidae)

2007 ◽  
Vol 139 (5) ◽  
pp. 700-712 ◽  
Author(s):  
Rebecca H. Hallett ◽  
Sheila A. Goodfellow ◽  
James D. Heal
Keyword(s):  
Population Dynamics ◽  
Pheromone Trap ◽  
Pheromone Traps ◽  
Light Traps ◽  
Sticky Traps ◽  
Incandescent Light ◽  
Emergence Traps ◽  
Swede Midge ◽  
Contarinia Nasturtii

AbstractIn 2002, two types of light traps were compared against sticky yellow cards for efficiency and selectivity in capturing adult swede midge Contarinia nasturtii (Kieffer) (Diptera: Cecidomyiidae). Incandescent light traps were more efficient at capturing swede midge than were sticky traps. Incandescent light traps were more selective than blacklight traps and required less time for processing of samples and identification of captured midges. Emergence (2003 and 2004) and pheromone (2004) traps were used to assess swede midge population dynamics. Captures from emergence traps indicate up to five overlapping emergence events for swede midge each year. Emergence traps captured swede midge earlier in the season than pheromone traps, but pheromone-trap captures continued later in the season than those in emergence traps. Pheromone traps are small and portable, easy to maintain, and capture significantly more swede midge than emergence traps.

A Population Dynamics Study of the Bollworm 1 and the Tobacco Budworm with Light Traps 23

1973 ◽  
Vol 2 (2) ◽  
pp. 244-252 ◽  
Author(s):  
A. W. Hartstack ◽  
J. P. Hollingsworth ◽  
R. L. Ridgway ◽  
J. R. Coppedge
Keyword(s):  
Population Dynamics ◽  
Tobacco Budworm ◽  
Light Traps

scholarly journals Surveillance entomologique des Culicoides (Diptera: Ceratopogonidae), vecteurs de la fièvre catarrhale en Tunisie

2009 ◽  
Vol 62 (2-4) ◽  
pp. 137 ◽  
Author(s):  
Soufien Sghaier ◽  
Salah Hammami ◽  
H. Hammami ◽  
A. Dkhil ◽  
Jean Claude Delecolle
Keyword(s):  
Population Dynamics ◽  
Light Traps ◽  
Entomological Surveillance ◽  
Biting Midges ◽  
Study Population ◽  
First Time ◽  
Arboviral Disease

Bluetongue (BT) is an arboviral disease that affects ruminants. BT virus is transmitted by biting midges of the genus Culicoides (Diptera: Ceratopogonidae). Since 1999, BTV outbreaks have occurred in Tunisia and two serotypes (BTV-2 and BTV-1) have been involved in 2000 and 2006, respectively. Entomological surveillance has been implemented in Tunisia with the aim to study population dynamics of C. imicola and other potential vectors. Two-night catches of midges per site were performed monthly from June 2006 through July 2008 on 14 sites through­out the country. A total of 11,582 Culicoides specimens, col­lected from 336 light traps, comprised 25 species of which seven were identified for the first time in Tunisia. The seasonal occur­rence of these species is described.

Evolutionary Games and Population Dynamics

1998 ◽  
Author(s):  
Josef Hofbauer ◽  
Karl Sigmund
Keyword(s):  
Population Dynamics ◽  
Evolutionary Games
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