Maternal and direct effects of natural-like changes of photoperiod and food condition manipulation on life history parameters in <Emphasis Type="Italic">Daphnia</Emphasis> |
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Authors: | Victor R Alekseev Dmitry L Lajus |
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Institution: | (1) Zoological Institute of the Russian Academia of Sciences, University emb., 1, 199034 St. Petersburg, Russia;(2) Department of Ichthyology and Hydrobiology, St. Petersburg State University, 16 Linia V.O., 29, 199178 St. Petersburg, Russia |
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Abstract: | This study analyzed changes of life history parameters of a Daphnia pulicaria clone in response to increasing (spring conditions) versus decreasing (fall conditions) photoperiod and low and high food
concentrations in maternal and offspring environments. One treatment increased the photoperiod from 12 to 16 h at a rate of
3 min per day, while the other treatment decreased the photoperiod from 16 to 12 h at the same rate. We also used two food
concentrations: low (0.2 mg C/l) and high (0.5 mg C/l). Maturation time, first clutch size, survivorship, and somatic growth
in offspring depended on the direction of photoperiodic changes for Daphnia grown under high food concentration. Natural-like changes of photoperiod on life history parameters and abrupt changes resulted
in similar effects on life history parameters of Daphnia (see Alekseev and Lampert 2004 Hydrobilogia 526:225–230). |
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Keywords: | Daphnia pulicaria Photoperiodic responses Diapause induction |
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