Effects of Low Temperature on Embryonic Development of Sceloporus Lizards

Copeia ◽  
1997 ◽  
Vol 1997 (4) ◽  
pp. 827 ◽  
Author(s):  
Robin M. Andrews ◽  
Carl P. Qualls ◽  
Barbara R. Rose
Keyword(s):  
Low Temperature ◽  
Embryonic Development

scholarly journals The influence of difference temperature against the rate of embryonic development and larval abnormality of Cantik Grouper (Epinephelus sp.)

2019 ◽  
Vol 2 (1) ◽  
pp. 16
Author(s):  
Aprisianus Julkarman Simbolon ◽  
Ganjar Adhywirawan Sutarjo ◽  
Hariyadi Hariyadi
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Incubation Temperature ◽  
Temperature Treatment ◽  
Optimum Temperature ◽  
Long Time ◽  
Epinephelus Fuscoguttatus ◽  
Low Levels ◽  
Difference Temperature ◽  
F 31

Cantikgrouper is the hybridization results grouper or cross-breeding between Epinephelus fuscoguttatus as a female and Epinephelus microdon as a male. The main barriers faced in the development of this commodity is still low levels of spawning up to seeding grouper. Based on the background, this study aimed to investigate optimum temperature observations against the rate of embryonic development Epinephelus sp.larvae. This study used the results of artificial spawning eggs.The fertilized eggs were incubated on six pieces of the container temperature treatment;each treatment there was repeated three times.The incubation temperature was kept on (A) 21-22°C; (B) 23-24°C; (C) 25-26°C; (D) 27-28°C; (E) 29-30°C; (F) 31-32°C. Results showed that eggswere incubated at a temperature of 21-22 ℃ embryonic development to a halt in the blastula, and temperature 23-24°C stalled on phasemyomere embryos. The low-temperature incubation period lasts a long time. Temperature 25-26°C needed 18 hours 6 minutes by 8.33% abnormality rate. Temperature 27-28°C needed 16 hours to hatch witha degree of abnormality of 7.6%. Temperature 29-30°C needed 15 hours 1 minute for the hatch tothe degree of abnormality of 5.33%. The 31-32°C temperature needed 14 hours 6 minutes to hatch witha degree of abnormality of 17.3%. The limits of tolerance for the incubation of the eggs ofcantik grouper (Epinephelusspp.) were 26-32°C.The best temperature of each treatment were obtained at a temperature of 29-30°C. Based on our results, it concluded that the changing temperature affected how long eggs could hatch.

scholarly journals High- and low-temperature manipulation during late incubation: Effects on embryonic development, the hatching process, and metabolism in broilers

2010 ◽  
Vol 89 (12) ◽  
pp. 2678-2690 ◽  
Author(s):  
H. Willemsen ◽  
B. Kamers ◽  
F. Dahlke ◽  
H. Han ◽  
Z. Song ◽  
...  
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Hatching Process ◽  
Temperature Manipulation

EFFECTS OF SHORT PERIODS OF LOW TEMPERATURE STRESS AT 17 DAYS INCUBATION ON HATCHABILITY AND EMBRYONIC DEVELOPMENT

1973 ◽  
Vol 53 (2) ◽  
pp. 219-227
Author(s):  
C. K. LEVENICK ◽  
P. A. KONDRA
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Temperature Stress ◽  
Treatment Effect ◽  
Low Temperature Stress ◽  
Stress Group ◽  
Stressed Group ◽  
High Incidence

Four groups of 80 eggs each were subjected to a low temperature stress of 3.8 C for 0, 4, 5, or 8 h, respectively, commencing after 17 days (408 h) incubation. Samples of these eggs were examined at 18.0, 19.5, 20.5, and 21.5 days incubation to study the treatment effect on embryonic development, and the remainder of the eggs were incubated for 22 days to determine the effect on hatchability. Hatchability was significantly reduced by 5 and 8 h of exposure to 3.8 C whereas 4 h of exposure caused a nonsignificant reduction in hatchability. Examination of embryos that failed to hatch revealed a high incidence of malpositions and abnormal hatching muscles. Malpositions occurred as early as 18 days incubation whereas edema, or hemorrhage, or both, of the hatching muscle did not begin to develop until 19.5 days. By 20.5 days of age the hatching muscles of the 8-h stressed group were significantly heavier than all other groups. The weight of the hatching muscle from the 5- and 8-h exposure groups increased continually during incubation whereas those of the controls and 4-h stress group had begun to decrease by 20.5 days and 21.5 days, respectively.

Low-Temperature Protection of Marine Turtle Eggs During Long-Distance Relocation

1989 ◽  
Vol 16 (3) ◽  
pp. 317 ◽  
Author(s):  
JL Harry ◽  
CJ Limpus
Keyword(s):  
Low Temperature ◽  
Sex Ratio ◽  
Embryonic Development ◽  
Incubation Period ◽  
Temperature Regime ◽  
Loggerhead Turtle ◽  
Caretta Caretta ◽  
Early Embryonic Development ◽  
Marine Turtle ◽  
Long Distance

Movement of marine turtle eggs, between about 3 hours and 3 weeks after oviposition, often results in substantial embryonic mortality. Eggs of the loggerhead turtle (Caretta caretta), which were cooled to 7-10�C within a few hours of oviposition, were relocated 1077 km in 14 h before being set at temperatures within the normal incubation range (26, 28 and 32�C). The percentage of viable embryos and hatchlings produced from these eggs was comparable to that of undisturbed eggs laid in natural nests. The incubation period and the sex ratio of the hatchlings, observed for each temperature regime, were unaffected by the initial cooling. Cooling C. caretta eggs effectively arrests early embryonic development, thereby extending the period during which eggs can be relocated without causing movement-induced mortality. This procedure is applicable in situations where turtle eggs must be transported for research or hatchery management purposes.

scholarly journals Low Temperature Effects on Embryonic Development and Hatch Time

1996 ◽  
Vol 75 (7) ◽  
pp. 924-932 ◽  
Author(s):  
M.E. SUAREZ ◽  
H.R. WILSON ◽  
B.N. MCPHERSON ◽  
F.B. MATHER ◽  
C.J. WILCOX
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Temperature Effects

Effects of catechins and low temperature on embryonic development and hatching in Heterodera glycines and Meloidogyne incognita

Nematology ◽  
2013 ◽  
Vol 15 (6) ◽  
pp. 653-663 ◽  
Author(s):  
Edward P. Masler ◽  
Edward P. Masler ◽  
Stephen T. Rogers ◽  
Edward P. Masler ◽  
Stephen T. Rogers ◽  
...  
Keyword(s):  
Low Temperature ◽  
Embryonic Development ◽  
Meloidogyne Incognita ◽  
Heterodera Glycines ◽  
Epigallocatechin Gallate ◽  
Chitinase Activity ◽  
Cyst Nematodes ◽  
Nematode Eggs ◽  
Temperature Exposure ◽  
Low Temperature Exposure

Mimics of two natural influences, a chemical similar to one present in cyst nematodes and low temperature exposure of nematode eggs, were evaluated for their effects on quantitative and qualitative features of embryonic development and hatching. The polyphenol epigallocatechin gallate (EGCG), an analogue of a compound found in nematode cysts, reduced hatch from both Heterodera glycines and Meloidogyne incognita eggs. Reduction was by 22.7% in H. glycines and 68.5% in M. incognita at 14 days after exposure to 1.0 mM EGCG. Significant reductions in hatch were observed at 7 days after exposure in H. glycines eggs, and as early as 5 days in M. incognita. Half-maximal percentage hatch was delayed by 0.6 days in H. glycines and 1.1 days in M. incognita (16.2 and 18.3%, respectively). Decreased hatch was associated primarily with an increase in unhatched, but viable, second-stage juveniles (J2). Hatch levels could be completely restored by day 14 in both species if EGCG was replaced with water on day 3. Replacement on day 7 partially restored hatch in M. incognita but was not effective in H. glycines. Inhibition of chitinase activity by EGCG suggests one factor in J2 retention in the egg. Exposure to low temperature decreased hatch by ca 50% in both species but without accumulation of unhatched J2. This stage peaked on day 3 in H. glycines-treated eggs, and on day 7 in M. incognita. However, response to low temperature in each species was characterised by developmental arrest at the first-stage juvenile.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

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