The influence of temperature on the survival, development, growth, and chromosome preparation quality of the EFG/C, ACD, and AA cytotypes of the Simulium venustum–verecundum complex (Diptera: Simuliidae)

1991 ◽  
Vol 69 (5) ◽  
pp. 1356-1365 ◽  
Author(s):  
John W. McCreadie ◽  
Murray H. Colbo
Keyword(s):  
Larval Development ◽  
Field Data ◽  
Polytene Chromosomes ◽  
Mixed Population ◽  
Threshold Temperature ◽  
Degree Days ◽  
Influence Of Temperature ◽  
Rearing Conditions ◽  
Influence Of Temperature On

The influence of temperature on survival, development, and growth of simuliid larvae of the EFG/C cytotype and of a mixed population of ACD–AA cytotypes was examined, employing a stir bar rearing system. The EFG/C type completed larval development from 5 to 30 °C, with maximum survival between 15 and 20 °C (68.0–73.5%). The ACD–AA types completed development between 5 and 25 °C, with maximum survival between 15 and 25 °C (55.3–61.0%). The temperature–survivorship curve of EFG/C was significantly different from the ACD–AA one. Using regression analysis, threshold temperature was determined to be 0 °C. Mean degree-days required to complete larval development varied depending on temperature, cytotype, and sex. Degree-day determination in the laboratory agreed well with field data. Final larval instars of EFG/C and ACD were largest at 10–15 °C. The results are compared with those of previous studies and discussed in relation to "optimal temperature" and fitness. The size and band discrimination of the salivary gland polytene chromosomes used to identify the above cytotypes were found to vary with rearing conditions. We suggest that larvae reared at 15 °C and fed Tetra, at a dosage of ≥ 0.3 mg/larva per day, will provide good-quality chromosome preparations.

EFFECT OF CONSTANT TEMPERATURES ON THE NUMBER OF LARVAL INSTARS OF THE ORIENTAL FRUIT MOTH, GRAPHOLITHA MOLESTA (LEPIDOPTERA: TORTRICIDAE)

1978 ◽  
Vol 110 (6) ◽  
pp. 623-626 ◽  
Author(s):  
W. P. Roberts ◽  
Jean R. Proctor ◽  
J. H. H. Phillips
Keyword(s):  
Larval Development ◽  
Laboratory Tests ◽  
Mixed Population ◽  
Oriental Fruit Moth ◽  
Larval Instars ◽  
Influence Of Temperature ◽  
Grapholitha Molesta ◽  
Influence Of Temperature On

AbstractLaboratory tests, at constant temperatures, were conducted to evaluate quantitatively the influence of temperature on development of the Oriental fruit moth, Grapholitha molesta (Busck). The results showed that at the highest temperature (30°C) some larvae had four instars and some had five, indicating a mixed population. Fifth instar larvae developed only at the highest temperature (30°C) where larval development was also most rapid. It can, therefore, be assumed that the Oriental fruit moth has four distinct larval instars when reared in the laboratory at 15°–24 °C.

scholarly journals Influence of temperature on the larval development of the edible crab, Cancer pagurus

2009 ◽  
Vol 89 (4) ◽  
pp. 753-759 ◽  
Author(s):  
Monika Weiss ◽  
Sven Thatje ◽  
Olaf Heilmayer ◽  
Klaus Anger ◽  
Thomas Brey ◽  
...  
Keyword(s):  
Larval Development ◽  
Body Mass ◽  
Large Scale ◽  
Citrate Synthase ◽  
C:N Ratio ◽  
Intraspecific Variability ◽  
Larval Body ◽  
Influence Of Temperature ◽  
Cancer Pagurus ◽  
Influence Of Temperature On

The influence of temperature on larval survival and development was studied in the edible crab, Cancer pagurus, from a population off the island of Helgoland, North Sea. In rearing experiments conducted at six different temperatures (6°, 10°, 14°, 15°, 18° and 24°C), zoeal development was only completed at 14° and 15°C. Instar duration of the Zoea I was negatively correlated with temperature. A model relating larval body mass to temperature and developmental time suggests that successful larval development is possible within a narrow temperature range (14° ± 3°C) only. This temperature optimum coincides with the highest citrate synthase activity found at 14°C. A comparison for intraspecific variability among freshly hatched zoeae from different females (CW 13–17 cm, N = 8) revealed that both body mass and elemental composition varied significantly. Initial larval dry weight ranged from 12.1 to 17.9 μg/individual, the carbon content from 4.6 to 5.8 μg/individual, nitrogen from 1.1 to 1.3 μg/individual, and the C:N ratio from 4.1 to 4.4. A narrow larval temperature tolerance range of C. pagurus as well as the indication of intraspecific variability in female energy allocation into eggs may indicate a potential vulnerability of this species to climate change. Large-scale studies on the ecological and physiological resilience potential of this commercially fished predator are needed.

The influence of temperature on the succession of redial and cercarial generations of Fasciola gigantica in a snail host

Parasitology ◽  
1964 ◽  
Vol 54 (1) ◽  
pp. 59-65 ◽  
Author(s):  
J. A. Dinnik ◽  
N. N. Diknik
Keyword(s):  
Larval Development ◽  
Low Temperatures ◽  
First Generation ◽  
Cold Season ◽  
Snail Host ◽  
Fasciola Gigantica ◽  
Natural Conditions ◽  
Influence Of Temperature ◽  
Cercarial Production ◽  
Influence Of Temperature On

Experiments on the larval development of Fasciola gigantica carried out under natural conditions have shown that at temperatures of 16° C. or less the rediae did not produce cercariae. The first-generation rediae, developed from the sporocyst, and all the rediae of subsequent generations produced only daughter rediae and did not change over to the production of cercariae as long as the low temperatures of the cold season lasted.As soon as the cold season ended and the temperature of the water in the aquaria containing the infected snails rose to a mean maximum of 20° C. all the rediae switched from redial to cercarial production.

scholarly journals Impact of Heat on the Different Stages of the Production of Local Beer “Tchoukoutou” Made from Sorghum

2021 ◽  
Vol 37 (6) ◽  
pp. 1359-1365
Author(s):  
Adjo Cynthia Kouakou ◽  
Agbékonyi Kokou Agbodan ◽  
Kwami Lumo Awaga ◽  
Awèdéou Bakpo ◽  
Eyawèdeou Yelegue ◽  
...  
Keyword(s):  
Germination Rate ◽  
Effect Of Temperature ◽  
Soaking Time ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Temperature Ranges ◽  
The Subject ◽  
Temperature Levels ◽  
C 30

Tchoukoutou is a local alcoholic drink made from sorghum. The optimization and good quality of this drink depend on certain factors such as temperature that were the subject of our work. To carry out this study, we have set ourselves the general objective of structuring the production of Tchoukoutou. Specifically, the study aims to systematize the cooking of the wort, to verify the properties of the beer through tests and to produce a quality drink. An investigation was made on the influence of temperature on sorghum germination and wort cooking. The study of the effect of temperature on the germination of sorghum was carried out. It concerned four different temperature levels which are: 23 ° C, 26 ° C, 30 ° C and 35 ° C. A study of the influence of temperature on brewing was done with different varieties of sorghum and also at different temperature ranges: 78 ° C, 83 ° C, 89 ° C, and 92 ° C. The results showed that the ideal germination temperature is 30 ° C and for brewing it is 78 ° C. The soaking time during germination, for a good germination rate, is between 16h and 26h. In conclusion, the temperature factor is a parameter that should not be overlooked when making Tchoukoutou. Our study thus made will serve as a basis for subsequent studies in the same direction to achieve a standardized industrial production of Tchoukoutou.

scholarly journals The Influence of Temperature on Changes in the Distinguishing Features of the Usable Quality of Soybean Meal

2018 ◽  
Vol 1 (1) ◽  
pp. 377-383
Author(s):  
Beata Drzewieniecka ◽  
Jan Drzewieniecki ◽  
Miroslav Blatnický
Keyword(s):  
Fatty Acid ◽  
Soybean Meal ◽  
Acid Content ◽  
Fatty Acid Content ◽  
Transport Processes ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
The Impact ◽  
Distinguishing Features

Abstract Soybean meal is one of the fodder components. It is a by-product of the production of soybean oil. Soybean meal is a specific cargo due to changes that may occur in it during transport processes. These changes are subject to many distinguishing features of usable quality inter alia fat and fatty acid content. The temperature and size of the soybean meal particles are among the factors influencing the transformations. The article presents the results of research on soybean meal and its individual fractions and the impact of selected indicators on the quality changes of this cargo. The results depend on the conditions corresponding to those that occur during the storage, handling and transport processes. The dependencies between them have been determined. The performed research allowed to determine the type and scope of changes taking place in this cargo under the influence of temperature. The results of the study showed that as the temperature rises, the fatty acid content in the soybean meal decreased during storage for a given period of 30 days.

COLOUR OF MEAT: II. EFFECT OF DESICCATION ON THE COLOUR OF CURED PORK

1939 ◽  
Vol 17d (2) ◽  
pp. 29-34 ◽  
Author(s):  
C. A. Winkler
Keyword(s):  
Relative Humidity ◽  
Colour Change ◽  
Storage Period ◽  
Moisture Loss ◽  
Influence Of Temperature ◽  
Dry Air ◽  
Intensity Changes ◽  
Influence Of Temperature On

In the absence of air, a linear relation, independent of temperature, was observed between moisture loss and colour change. The change was mainly one of intensity, and was reversible. In air, irrespective of its humidity, changes in both intensity and quality of colour occurred, but no definite relation was found between changes in humidity and colour quality for different samples. In saturated air, intensity changes became complete in the early part of the storage period, but the enhanced changes in air of lower humidity continued to increase. No influence of temperature on the rate of colour change was observed in dry air or in air of 60% relative humidity.

scholarly journals Temperature effects on Trichogramma pretiosum Riley and Trichogrammatoidea annulata De Santis

2003 ◽  
Vol 46 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Arlei Maceda ◽  
Celso L Hohmann ◽  
Honório R. dos Santos
Keyword(s):  
Temperature Effects ◽  
Entire Temperature Range ◽  
Temperature Threshold ◽  
Trichogramma Pretiosum ◽  
Degree Days ◽  
Parasitoid Species ◽  
Influence Of Temperature ◽  
Anagasta Kuehniella ◽  
Influence Of Temperature On ◽  
Lepidoptera Pyralidae

The influence of temperature on lifetime attributes of Trichogramma pretiosum Riley and Trichogrammatoidea annulata De Santis (Hymenoptera: Trichogrammatidae) was evaluated at four constant temperatures (15, 20, 25, and 30º C), RH 70 ± 10%, photophase 14 h. Anagasta kuehniella (Lepidoptera: Pyralidae) eggs were used as hosts. Developmental times of both parasitoid species were similar when exposed to 20, 25, or 30º C. T. annulata, however, developed slightly faster than T. pretiosum at 15º C. Emergence rates of both species were above 89%. The temperature threshold for T. pretiosum and T. annulata was 11º C and the number of degree-days required for their development was 126.9 and 122.3, respectively. Parasitization was maximal at 25º C. T. annulata, however, parasitized significantly more hosts than T. pretiosum in the entire temperature range. Temperature had no effect in brood size.T. annulata progeny consisted predominantly of males, except at 15º C, whereas in T.pretiosumitconsisted predominantly of females, except at 30º C. Parental females lived longer than males.

scholarly journals The Influence of Temperature on the Larval Development of Aelurostrongylus abstrusus in the Land Snail Cornu aspersum

Pathogens ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 960
Author(s):  
Simone Morelli ◽  
Mariasole Colombo ◽  
Anastasia Diakou ◽  
Donato Traversa ◽  
Marika Grillini ◽  
...  
Keyword(s):  
Larval Development ◽  
Larval Stage ◽  
Developmental Rate ◽  
Land Snail ◽  
Intermediate Hosts ◽  
Aelurostrongylus Abstrusus ◽  
Influence Of Temperature ◽  
The Third ◽  
Influence Of Temperature On ◽  
Cornu Aspersum

The metastrongyloid Aelurostrongylus abstrusus has an indirect lifecycle involving gastropod intermediate hosts. The widespread snail Cornu aspersum is an efficient intermediate host of A. abstrusus. As the temperature may influence the developmental rate of metastrongyloids from first (L1) to the third infective larval stage (L3) inside molluscs, this study evaluated the effect of two controlled temperatures on the development of A. abstrusus in C. aspersum. Overall, 300 snails were infected with 500 L1 of A. abstrusus and kept at ∼25 °C. Fifteen days post infection (D15), the overall developmental rate to L3 (0.8%) was assessed in a subset of 20 snails. The remaining gastropods were divided in 2 groups, i.e., 180 still kept at ∼25 °C (G1) and 100 hibernated at ∼4 °C (G2). On D30, the larval development was evaluated in 20 snails from each group, while another batch of 80 snails was selected random from G1 and hibernated at ∼4 °C (G3). The larval developmental rate was determined digesting 20 snails from each of the three groups on D45, D60, and D75. The higher mean developmental rate was registered in G1 (3.8%) compared to G2 (1.9%) and G3 (2.3%), indicating that the development to L3 of A. abstrusus in C. aspersum is positively influenced by the increase of temperature.

Sign in / Sign up

Export Citation Format

Share Document