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Seasonal events in a natural population ofDaphnia carinata king

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Proceedings / Indian Academy of Sciences

Abstract

Seasonal variations in a natural population ofDaphnia carinata was carried out for a period of one year in a natural freshwater pond. Fluctuations in the density of this cladocera was found to be directly related to the fluctuations in the available food. The rise in water level and occurrence of ephippial eggs were correlated. Major components of the population were parthenogenetic females and ephippial eggs. Ephippial females and males were recorded in very low numbers for a short duration. The probable cause attributed to the production of males are crowding of females and reduction of available food material. Animals having a length of 1·6–2·0 mm. formed the predominant group in the population. The occurrence of most of the length groups in almost all the collections has been attributed to the continuous addition of young ones from the parthenogenetic females and by the hatching of ephippial eggs. While events in the life-cycle of this tropical species are similar to those observed in cladocera from other climatic regions, the occurrence of ephippial eggs and their probable role in the population build up was found to be unique for this species.

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Authors and Affiliations

  1. Department of Zoology, Madurai University, Madurai-2, S. India

    Sumitra Vijayaraghavan

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  1. Sumitra Vijayaraghavan
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Communicated by Dr. S. Krishnaswamy,f.a.sc.

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Vijayaraghavan, S. Seasonal events in a natural population ofDaphnia carinata king. Proc. Indian Acad. Sci. 71, 193–203 (1970). https://doi.org/10.1007/BF03050295

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  • DOI: https://doi.org/10.1007/BF03050295

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