Studies of the Emergence Rhythm of the Eye Gnat Hippelates pusio Loew (Diptera: Chloropidae)

1964 ◽  
Vol 47 (4) ◽  
pp. 227 ◽  
Author(s):  
Lester E. Scherer
Keyword(s):  
Emergence Rhythm

Diel pattern of emergence in grayling (Thymallus thymallus Linnaeus, 1758)

1990 ◽  
Vol 68 (3) ◽  
pp. 465-469 ◽  
Author(s):  
Agnès Bardonnet ◽  
Philippe Gaudin
Keyword(s):  
Light Conditions ◽  
Diel Pattern ◽  
Thymallus Thymallus ◽  
Daily Pattern ◽  
Rearing Conditions ◽  
Emergence Rhythm

The emergence rhythm of grayling fry (Thymallus thymallus) was studied under semi-natural rearing conditions, using special traps buried in the gravel. The diel pattern of emergence proved to be mainly diurnal, with a maximum just after sunrise. The discussion emphasizes the fact that this distinguishes the grayling from other salmonids, and since eggs are buried at a reduced depth, proposes the hypothesis that light conditions during development influence the daily pattern of emergence.

Hybrids between Schistosoma mansoni and S. rodhaini: characterization by cercarial emergence rhythms

Parasitology ◽  
1989 ◽  
Vol 99 (2) ◽  
pp. 225-228 ◽  
Author(s):  
A. Thèron
Keyword(s):  
Schistosoma Mansoni ◽  
Parental Species ◽  
Genetic Determinism ◽  
The Other ◽  
Relative Importance ◽  
Emergence Rhythm ◽  
Cercarial Emergence

SummaryHybridization between Schistosoma mansoni, with a diurnal cercarial emergence rhythm and S. rodhaini, with a nocturnal cercarial shedding pattern leads to F1 and F2 generations, hybrid schistosomes whose chronobiological phenotype of cercariae is characterized by two unequal emergence peaks, one diurnal and the other nocturnal. The relative importance of diurnal and nocturnal peaks depends upon which S. mansoni strain (early or late) is used for the hybridization with S. rodhaini. The results are compared and discussed with those resulting from crosses between intraspecific sympatric and allopatric chronobiological variants (early and late) of S. mansoni. The genetic determinism of the cercarial emergence of schistosomes and the significant differences observed between cercarial shedding patterns of parental species and their hybrids allow the use of this behavioural marker in biological and genetical studies in schistosome populations.

Adult Emergence Rhythm of Fruit FliesDrosophila melanogasterunder Seminatural Conditions

2012 ◽  
Vol 27 (4) ◽  
pp. 280-286 ◽  
Author(s):  
Joydeep De ◽  
Vishwanath Varma ◽  
Vijay Kumar Sharma
Keyword(s):  
Adult Emergence ◽  
Emergence Rhythm

scholarly journals Selection of rye on leaf-emergence rhythm.

1967 ◽  
Vol 15 (3) ◽  
pp. 229-236
Author(s):  
R.F. Hoogland
Keyword(s):  
Leaf Size ◽  
Main Axis ◽  
Leaf Emergence ◽  
Before And After ◽  
Emergence Rhythm ◽  
Selection Of

The emergence rhythm of leaves on the main axis was shown to be a heritable character in Zelder. This rhythm, which is correlated with leaf size, may be the same before and after ear initiation, or different. By selection, four different rhythms were obtained; a low rhythm before and after ear initiation resulted in shorter straw and more rapid ear emergence. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Influence of Daily Variations of Light and Temperature on the Emergence Rhythm of Grayling Fry (Thymallus thymallus)

1991 ◽  
Vol 48 (7) ◽  
pp. 1176-1180 ◽  
Author(s):  
Agnès Bardonnet ◽  
Philippe Gaudin
Keyword(s):  
Constant Temperature ◽  
Early Morning ◽  
Thymallus Thymallus ◽  
Temperature Variations ◽  
Emergence Pattern ◽  
Daily Variations ◽  
Emergence Rhythm ◽  
Dim Light

The emergence rhythm of grayling fry (Thymallus thymallus) was studied in four aquaria fitted with traps under four different conditions of light and temperature. Both light and temperature induced an emergence rhythm characterized by a 24-h period. Under ambient Sight and constant temperature, emergence peaked at the end of the night before the onset of dawn. Under constant dim light and varying temperature, emergence peaked in early morning during the coldest hours. When both light and temperature fluctuated daily the emergence pattern was equivalent to the "sum" of these previous two regimes and was similar to that described in the field in a previous report. In the absence of light and temperature variations, no emergence rhythm was observed.

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