The Effect of Barometric Pressure Upon Oviposition of the Imported Cabbageworm, Pieris rapae (L.)

1949 ◽  
Vol 81 (5) ◽  
pp. 132-132 ◽  
Author(s):  
W. P. Stephen ◽  
R. D. Bird
Keyword(s):  
Pieris Rapae ◽  
Weather Conditions ◽  
Barometric Pressure ◽  
Egg Laying ◽  
Vegetable Gardens ◽  
Insect Activity ◽  
Relationship Of ◽  
The Relationship

It is a well known fact that the flight of moths and some other insects is affected by barometric pressure, but it is not well known how this phenomenon affects other insect activity. In a study of the ecology of insects in vegetable gardens at Brandon, Man., in 1948, the relationship of barometric pressure to insect activity was recorded.It was noted in the field that the imported cabbageworm adults behaved differently under varying weather conditions. During warm, clear days they did little but move about freely and feed, but on days that were overcast, particularly preceding rain, they became active about the plants and appeared to be engaged mainly in egg laying.

MORPHOLOGY OF THE FEMALE TERMINALIA IN LEPIDOPTERA, AND ITS TAXONOMIC SIGNIFICANCE

1972 ◽  
Vol 104 (7) ◽  
pp. 1055-1071 ◽  
Author(s):  
Akira Mutuura
Keyword(s):  
Morphological Characters ◽  
Egg Laying ◽  
Food Plants ◽  
Taxonomic Significance ◽  
Genealogical Tree ◽  
Genital Opening ◽  
Phylogenetic Classification ◽  
Relationship Of ◽  
The Relationship

AbstractIn the phylogenetic classification of the Lepidoptera, the position of the genital opening and its modifications help to clarify the relationship of the Zeugloptera to the lepidopterous suborders. Three different systems of the suborder classification of the Lepidoptera, into Homoneura and Heteroneura (Tillyard, Imms, etc.), Monotrysia and Ditrysia (Borner), and Dacnonypha, Monotrysia, and Ditrysia (Hinton), are not supported by evidence obtained in the study of the female genitalia.The development of the female terminalia is closely associated with the mode of oviposition. Several types of female terminalia are found in the primitive Lepidoptera (Hepialidae, Neopseustidae, Tischeriidae, Lyonetiidae, Agathiphagidae, Tineidae, Nepticulidae, and Eriocraniidae). They are divided into four categories: hepialid type — the eggs are dropped randomly; typical lepidopterous type — the eggs are laid on the surface of food plants; eriocraniid type — the eggs are laid inside the food plants; tineid type — the eggs are laid in crevices of food. Each of the types is derivable from the types occurring in Neopseustidae, Tischeriidae, Agathiphagidae, and Eriocraniidae, respectively. These types are still far removed from the type of female terminalia in Micropterygidae of the Zeugloptera.The modes of egg-laying as well as the morphological characters of the female genitalia must be taken into consideration in suborder classification of the Lepidoptera.A genealogical tree based on the female terminalia suggests four main branches: hepialid branch — includes Neopseustidae and Prototheoridae; typical lepidopterous branch — includes all Ditrysia and Nepticulidae; tineid branch — includes only Tineidae; eriocraniid branch — includes Incurvariidae, Prodoxidae, Adelidae, and Heliozelidae.

scholarly journals The relationship of agroclimatic factors and the yield of potato varieties in the conditions of the near Moscow region

2021 ◽  
Vol 2 (44) ◽  
pp. 21-21
Author(s):  
Alexander Saakian ◽  
◽  
Keyword(s):  
Starch Content ◽  
Organic Fertilizer ◽  
Weather Conditions ◽  
Climatic Conditions ◽  
Hydrothermal Coefficient ◽  
Potato Varieties ◽  
Yield And Quality ◽  
Relationship Of ◽  
The Relationship

In 2005-2015. studied the effect of liquid organic fertilizer BIOOD-1 as foliar feeding on the yield and quality of various potato varieties in changing meteorological conditions. According to the results of the experiments, it was established that the most stable yields under various weather conditions were shown by the potatoes of the mid-season variety Bryansk delicacy. The low starch content of varieties Nevsky, Udacha was noted in years of high humidity, but with a lack of moisture, the starch content of these varieties increased in the background variant and in the experiment with organic fertilization. Keywords: CLIMATIC CONDITIONS, HYDROTHERMAL COEFFICIENT, MEAN SENIOR PRECIPITATION, POTATO, YIELD, STARCH, HUMIC FERTILIZERS

scholarly journals The relationship of mean temperature and 9 collected butterfly species’ wingspan as the response of global warming

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Sumi Na ◽  
Eunyoung Lee ◽  
Hyunjung Kim ◽  
Seiwoong Choi ◽  
Hoonbok Yi
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Pieris Rapae ◽  
Wing Length ◽  
Butterfly Species ◽  
Butterfly Wing ◽  
Mean Temperature ◽  
Positive Correlations ◽  
Relationship Of ◽  
The Relationship

Abstract Background Organism body size is a basic characteristic in ecology; it is related to temperature according to temperature-size rule. Butterflies are affected in various aspects by climate change because they are sensitive to temperature. Therefore, this study was conducted to understand the effect of an increase in temperature due to global warming on the wing of butterflies. Results A total of 671 butterflies belonging to 9 species were collected from 1990 to 2016 in Seoul (336 specimens) and Mokpo (335 specimens). Consequently, as the mean temperature increased, the wing length of the species increased. However, there are exceptions that the Parnassius stubbendorfii, Pieridae canidia, and Pieris rapae wing length of Seoul increased, but the butterfly wing length of Mokpo decreased. Conclusions The positive correlations between the butterfly wing length and mean temperature showed that the change of mean temperature for about 26 years affects the wing length of butterfly species. The exception is deemed to have been influenced by the limited research environment, and further studies are needed. We would expect that it can be provided as basic data for studying effect of climate change.

scholarly journals Insect folivory in Didymopanax vinosum (Apiaceae) in a vegetation mosaic of Brazilian cerrado

2006 ◽  
Vol 66 (2b) ◽  
pp. 671-680 ◽  
Author(s):  
E. M. Varanda ◽  
M. P. Pais
Keyword(s):  
Decisive Role ◽  
Sensu Stricto ◽  
Leaf Damage ◽  
Leaf Toughness ◽  
Scattered Trees ◽  
Insect Activity ◽  
Observed Damage ◽  
Relationship Of ◽  
Plant Apparency ◽  
The Relationship

Susceptibility of Didymopanax vinosum (Apiaceae) to insect herbivores was investigated in three sites of a cerrado mosaic - composed of campo cerrado (a grassland with scattered trees and shrubs), cerradão (a tall woodland) and cerrado sensu stricto (intermediate between the two) - situated in Cerrado Pé-de-Gigante, Santa Rita do Passa Quatro, SP, Brazil. We also examined the relationship of folivory with the composition and abundance of the insect herbivore fauna, and with several nutritional and defensive plant characteristics (water, nitrogen, cellulose, lignin, tannin leaf contents, and leaf toughness). We collected insects associated with D. vinosum every month, and we measured leaf damage every three months. In general, the annual folivory differed among sites. It reached the highest rates in site 1 and site 3: 7.33 and 8.5 percent, respectively. Only 1.32 percent of annual folivory was observed in site 2. These levels resulted from the higher abundance, in sites 1 and 3, of the thrips Liothrips didymopanacis (Phlaeothripidae), the most abundant herbivore sampled, responsible for more than 90 percent of the observed damage. However, no significant relationship was found between insect activity and the chemical and physical composition of the leaves. Our findings suggest that, at least in this species, other chemical compounds or variables related to plant apparency and resource availability to herbivores (e.g. plant architecture) might play a more decisive role in the spatial variation of folivory than the nutritional and defensive traits that were analyzed.

El Niño and its impact on fire weather conditions in Alaska

2001 ◽  
Vol 10 (1) ◽  
pp. 1 ◽  
Author(s):  
Jason C. Hess ◽  
Carven A. Scott ◽  
Gary L. Hufford ◽  
Michael D. Fleming
Keyword(s):  
Weather Conditions ◽  
Weather Patterns ◽  
Area Burned ◽  
Temperature And Precipitation ◽  
Northern Latitudes ◽  
Dry Conditions ◽  
Alaskan Coast ◽  
The Tropics ◽  
Relationship Of ◽  
The Relationship

Examining the relationship of El Niño to weather patterns in Alaska shows wide climate variances that depend on the teleconnection between the tropics and the northern latitudes. However, the weather patterns exhibited in Alaska during and just after moderate to strong El Niño episodes are generally consistent: above normal temperature and precipitation along the Alaskan coast, and above normal temperature and below normal precipitation in the interior, especially through the winter. The warm, dry conditions in the Alaskan interior increase summer wildfire potential. Statistics on the area burned since 1940 show that 15 out of 17 of the biggest fire years occurred during a moderate to strong El Niño episode. These 15 years account for nearly 63% of the total area burned over the last 58 years. Evidence points to increased dry thunderstorms and associated lightning activity during an El Niño episode; the percentage of total area burned by lightning caused fires during five episodes increased from a normal of less than 40% to a high of about 96%.

scholarly journals An angle speed and thrust relationship of the rotor system in the quadcopter aircraft

2019 ◽  
Vol 13 (2) ◽  
pp. 469
Author(s):  
Al Al ◽  
Arfita Yuana Dewi ◽  
Antonov Bachtiar ◽  
Dwi Harinita
Keyword(s):  
Control Systems ◽  
Rotation Speed ◽  
Weather Conditions ◽  
Voltage Source ◽  
Rotor Speed ◽  
High Type ◽  
Rotor Angle ◽  
And Control ◽  
Relationship Of ◽  
The Relationship

Utilizing Quadcopter were still many obstacles such as; plane easy to fall; the battery is not durable; vulnerable to weather conditions and others. The research and development has grown to improve aircraft facilities and capabilities. Many parameters related to aircraft lift capability factors; fly long; flying high; type of motor; the type of propeller: including the sensors and control systems used. This study was to find the relationship between changes in the BLDC motor voltage source to the rotor angle velocity <em>(ω)</em>; rotor speed to rotor lift <em>(Ft)</em>;  wind speed to rotor lift; push the following rotor <em>(Ct)</em>. Empirical testing was conducted in the laboratory to find the relationship of these parameters. The results data show that; the lift power generated with rotational speed was not proportional, non linearity occurs when the rotor was released from the self and starts pulling the strain gauge when the rotation speed reaches around 65 <em>rps</em>. Once the rotation speed of the rotor is able to reach up to 1.5 Newton lift then the thrust rising trend sharply<strong> </strong>increasing <strong>to</strong>increasing <strong>of </strong>the rotor speed. A motor hade 1200 <em>KV</em> and blade with a radius of 0.12 <em>m</em>, then obtained thrust <em>(Ct)</em> of 1.732.

scholarly journals The Relationship of Weight and Ovarian Development in Bombus terrestris L. Workers under Different Social Conditions

2016 ◽  
Vol 60 (2) ◽  
pp. 51-58
Author(s):  
Ayhan Gosterit ◽  
Ozgur Koskan ◽  
Fehmi Gurel
Keyword(s):  
Ovarian Development ◽  
Bombus Terrestris ◽  
Egg Laying ◽  
Social Conditions ◽  
Starting Time ◽  
Significant Difference ◽  
Relationship Of ◽  
The Relationship ◽  
Egg Laying Behaviour ◽  
Group 1

Abstract Egg-laying behaviour of bumblebee workers is highly flexible and influenced by the bees’ social status and social environment. In this study, the dependence of the starting time of ovarian development in Bombus terrestris workers was determined under four different social conditions. The purpose was to test the effect of group stimulation and the presence of a queen on ovarian development. The relationship between weight and the commencement of ovarian development in workers was also investigated. We created four test groups: (1) 8 callow workers with a queen, (2) 8 callow workers without a queen, (3) 1 callow worker with a queen, and (4) 1 callow worker without a queen. Mated and hibernated (freshly awoken) B. terrestris queens made up Group 1 and 3. There was no significant difference between the starting times of ovarian development in the experimental groups composed of 8 callow workers in queenright (9.81 ± 2.44 days) and queenless (9.53 ± 2.53 days) conditions. However, ovaries of workers confined singly with a queen started to develop significantly earlier (11.77 ± 3.30 days) than workers confined singly without a queen (14.70 ± 3.56 days). The observations indicate that the presence of a queen does not inhibit the ovarian development of workers. The Point-Biserial Correlation Coefficient between the starting of ovarian development in workers and their weight was −0.013. However, there was a positive correlation between the weight and the ovarian developmental status of workers in groups containing 8 workers.

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