The Emergence Rhythm of the Dung-Fly, Scopeuma (=Scatophaga) stercoraria (L.)

10.2307/1408 ◽  
1943 ◽  
Vol 12 (1) ◽  
pp. 11 ◽  
Author(s):  
C. B. Lewis ◽  
J. D. Bletchly
Keyword(s):  
Scatophaga Stercoraria ◽  
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.

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