Seasonal and daily plasma melatonin rhythms and reproduction in Senegal sole kept under natural photoperiod and natural or controlled water temperature

2007 ◽  
Vol 43 (1) ◽  
pp. 50-55 ◽  
Author(s):  
L. M. Vera ◽  
C. De Oliveira ◽  
J. F. López-Olmeda ◽  
J. Ramos ◽  
E. Mañanós ◽  
...  
Keyword(s):  
Water Temperature ◽  
Plasma Melatonin ◽  
Natural Photoperiod ◽  
Senegal Sole

Seasons induce changes in the daily rhythm of plasma melatonin in goats (Capra hircus)

2015 ◽  
Vol 65 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Vincenzo Carcangiu ◽  
Claudia Giannetto ◽  
Sebastiano Luridiana ◽  
Francesco Fazio ◽  
Maria Consuelo Mura ◽  
...  
Keyword(s):  
Jugular Vein ◽  
Reproductive Physiology ◽  
Daily Rhythm ◽  
Capra Hircus ◽  
Winter Solstice ◽  
Vernal Equinox ◽  
Melatonin Concentration ◽  
Plasma Melatonin ◽  
Natural Pasture ◽  
Natural Photoperiod

To evaluate the influence of natural photoperiod on the daily rhythm of melatonin, we assessed melatonin plasma concentration at four different times of the year. Ten Sarda breed goats were led to the natural pasture during the day and were kept in a common stall during the night. Blood samples were collected by means of a cannula inserted into the jugular vein, every two hours for a 24-hour period during the vernal equinox, summer solstice, autumn equinox, and winter solstice. Our results showed the existence of clear seasonal variation in the daily rhythm of plasma melatonin in goats, with the highest MESOR value in winter followed by spring. Acrophase was always observed in the middle of the scotophase. Robustness of the rhythm was higher in the spring as compared to the winter. Our results showed a daily rhythm of plasma melatonin concentration strongly related to the seasons. These results could be useful to establish appropriately timed melatonin and/or photoperiod treatments for the management of reproductive physiology in goats.

scholarly journals Plasma melatonin profiles of Romney Marsh sheep in natural photoperiod and in acutely extended darkness

Reproduction ◽  
1992 ◽  
Vol 95 (3) ◽  
pp. 869-875 ◽  
Author(s):  
C. D. Matthews ◽  
R. F. Seamark ◽  
M. V. Guerin
Keyword(s):  
Plasma Melatonin ◽  
Natural Photoperiod

Plasma melatonin in the horse: Measurements in natural photoperiod and in acutely extended darkness throughout the year

1995 ◽  
Vol 19 (1) ◽  
pp. 7-15 ◽  
Author(s):  
Michael V. Guerin ◽  
Jim R. Deed ◽  
David J. Kennaway ◽  
Colin D. Matthews
Keyword(s):  
Plasma Melatonin ◽  
Natural Photoperiod

Influence of the lunar cycle on plasma melatonin, vitellogenin and sex steroids rhythms in Senegal sole, Solea senegalensis

Aquaculture ◽  
2010 ◽  
Vol 306 (1-4) ◽  
pp. 343-347 ◽  
Author(s):  
C. Oliveira ◽  
N.J. Duncan ◽  
P. Pousão-Ferreira ◽  
E. Mañanós ◽  
F.J. Sánchez-Vázquez
Keyword(s):  
Sex Steroids ◽  
Lunar Cycle ◽  
Solea Senegalensis ◽  
Plasma Melatonin ◽  
Senegal Sole

Influence of Constant Light and Darkness, Light Intensity, and Light Spectrum on Plasma Melatonin Rhythms in Senegal Sole

2007 ◽  
Vol 24 (4) ◽  
pp. 615-627 ◽  
Author(s):  
Catarina Oliveira ◽  
Aurelio Ortega ◽  
José Fernando López‐Olmeda ◽  
Luisa María Vera ◽  
Francisco Javier Sánchez‐Vázquez
Keyword(s):  
Light Intensity ◽  
Constant Light ◽  
Light Spectrum ◽  
Plasma Melatonin ◽  
Senegal Sole

The diatoms as a component of bottom algocenoses in the mouth of the Oka River

2019 ◽  
Author(s):  
Alexander G. Okhapkin ◽  
Tabet Hhedairia
Keyword(s):  
Water Temperature ◽  
Preliminary Estimation ◽  
Composition And Structure

The preliminary estimation of composition and structure of diatoms in the benthos of the Oka River allowed to determine the clear spatiotemporal confinedness of structure in such communities of them which has the most diverse composition in the low water period while water temperature decreasing.

Incubation Temperature Influences the Duration of Egg Hatching and Early Development in the Boreal Digging Frog, Kaloula Borealis

2020 ◽  
Vol 3 (1) ◽  
pp. ACCEPTED
Author(s):  
Rho-Jeong Rae
Keyword(s):  
Water Temperature ◽  
Early Life ◽  
Rainy Season ◽  
Incubation Temperature ◽  
Life Stages ◽  
Early Life Stages ◽  
Egg Hatching ◽  
Significant Difference ◽  
The Mean ◽  
Hatching Rates

This study investigated the boreal digging frog, Kaloula borealis, to determine the egg hatching period and whether the hatching period is affected by incubation temperature. The results of this study showed that all the eggs hatched within 48 h after spawning, with 28.1% (±10.8, n=52) hatching within 24 h and 99.9% (±0.23, n=49) within 48 h after spawning. A significant difference was noted in the mean hatching proportion of tadpoles at different water temperatures. The mean hatching rates between 15 and 24 h after spawning was higher at a water temperature of 21.1 (±0.2) °C than at 24.1 (±0.2) °C. These results suggest that incubation temperature affected the early life stages of the boreal digging frog, since they spawn in ponds or puddles that form during the rainy season.

Pulsatile GnRH administration is attended by decreased plasma melatonin in patients suffering from GnRH deficiency

1989 ◽  
Vol 120 (3_Suppl) ◽  
pp. S50-S51
Author(s):  
R. P. WILLIG ◽  
J. C. COMMENTZ ◽  
N. STAHNKE
Keyword(s):  
Plasma Melatonin ◽  
Pulsatile Gnrh
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