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Hydrobiologia

, Volume 17, Issue 3, pp 205–217 | Cite as

On some aspects of the natural occurrence of Chirocephalus diaphanus Prévost

  • R. E. Hall
Article

Summary

  1. 1.

    The occurrence of Chirocephalus diaphanus Prévost in two habitats of somewhat different character is described from observations extending over a number of years.

     
  2. 2.

    The records in both cases underline the sporadic and irregular occurrence of this species.

     
  3. 3.

    The number of generations occurring during the course of a year appears to be related to the frequency with which the habitat dries out or is subjected to other unfavourable conditions. In general a second generation does not overlap the first and only appears when the habitat becomes wet again. after an interval of drying out.

     
  4. 4.

    The pattern of natural occurrence is discussed in the light of experimental work on conditions affecting development and hatching of the eggs.

     
  5. 5.

    A sequence of events is suggested by which viable eggs are enabled to remain unhatched while the habitat dries out, to survive desiccation, and finally to complete development to maturity in a very short period.

     
  6. 6.

    The possible effects of freezing of the habitat are discussed.

     

Keywords

Experimental Work Unfavourable Condition Natural Occurrence Irregular Occurrence Peut Observer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

  1. 1.

    La présence de Chirocephalus diaphanus Prévost dans deux habitats d'un type légèrement different est décrite, basée sur des observations faites durant plusieurs années.

     
  2. 2.

    Dans les deux cas les données montrent la presénce irregulière et sporadique de cette espèce.

     
  3. 3.

    La quantité des générations qui se trouvent pendant un an est manifestement en relation avec la fréquence avec laquelle l'habitat se desséche, ou se trouve dans des conditions défavorables. Ordinairement une seconde génération ne chevauche pas la. première génération; elle ne se présente qu'après un intervalle de dessèchement.

     
  4. 4.

    Le schema de la présence naturelle est discuté en comparaison avec les investigations expérimentales, des conditions qui influencent le développementt et l'éclosion des oeufs.

     
  5. 5.

    On peut observer une succession des phénemènes où les oeufs viables peuvent rester sans écolose quand l'habitat se desséche et pouvant survivre la desiccation, enfin pouvant arriver à maturité dans une période très courte.

     
  6. 6.

    Les eflets probables de la congélation de l'habitat sont discutés.

     

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References

  1. Baird, W. - 1849 - Natural history of the British Entomostraca. London, Ray Society.Google Scholar
  2. Dexter, R. W. & Kuehnle, C. H. - 1948 - Fairy Shrimp populations of Northeastern Ohio in the seasons 1945 and 1946. Ohio J. Sci. 48, 15–26.Google Scholar
  3. Dexter, R. W. & Kuehnle, C. H. - 1951 - Further studies on the Fairy Shrimp populations of Northeastern Ohio. Ohio J. Sci. 51, 73–86.Google Scholar
  4. Hall, R. E. - 1953 - Observations on the hatching of eggs of Chirocephalus diaphanus Prévost. Proc. zool. Soc. Lond., 123, 95–109.Google Scholar
  5. Hall, R. E. - 1959a. - Delayed development of eggs of Chirocephalus diaphanus Prévost. Hydrobiologia, 13, 160–169.Google Scholar
  6. Hall, R. E. - 1959b. - The development of eggs of Chirocephalus diaphanus Prévost at a low temperature. Hydrobiologia 13, 156–159.Google Scholar
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  10. Moore, W. G. - 1955 - Observations on heat death in the fairy shrimp, Streptocephalus seali. Proc. Louisiana Acad. Sci., 18, 5–12.Google Scholar
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Copyright information

© Dr W. Junk Publishers 1961

Authors and Affiliations

  • R. E. Hall
    • 1
  1. 1.Department of ZoologyUniversity of SouthamptonEngland

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