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Hydrobiological Journal
Secretaria Executiva do Conselho Editorial: L.I. Kalinina (open in a new tab)

Publicou 6 edições por ano

ISSN Imprimir: 0018-8166

ISSN On-line: 1943-5991

SJR: 0.221 SNIP: 0.469 CiteScore™:: 0.9 H-Index: 12

Indexed in

Influence of the Daylight Duration and Water Temperature on Numbers and Demographic Composition of Population of Polyphemus pediculus (Crustacea: Cladocera)

Volume 47, Edição 2, 2011, pp. 3-14
DOI: 10.1615/HydrobJ.v47.i2.10
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RESUMO

Numbers, demographic composition and ratio of sexes in P. pediculus population are affected by absolute value and vector variation of the daylight duration. Different types of specimens display their maximal numbers under different environmental conditions. Photoperiodic reaction of crustaceans belongs to a long-day type. Maximum population development and parthenogenetic females predomination are observed in a limited daylight duration range, from 15.5 to 17.5 hours per day. The daylight duration of 14 hours per day is a threshold, the beginning of mass transition into the dormant state. Period with the daylight duration 12 hours per day and less is unfavorable for the population.

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