The effects of temperature and food on copepodite development, growth and reproduction in three species of Boeckella (Copepoda; Calanoida)

Hydrobiologia ◽  
1988 ◽  
Vol 164 (3) ◽  
pp. 235-257 ◽  
Author(s):  
Colleen Jamieson ◽  
Carolyn Burns
Keyword(s):  
Effects Of Temperature ◽  
Growth And Reproduction

THE EFFECTS OF TEMPERATURE ON THE GROWTH AND REPRODUCTION IN SIMOCEPHALUS HIMALAYENSIS

2010 ◽  
Vol 36 (4) ◽  
pp. 794-805 ◽  
Author(s):  
Xin-Lu SHI ◽  
Cai-Hua QI ◽  
Gui-Jie LIU ◽  
Shuang-Yan BAO ◽  
Xiao-Na HUANG
Keyword(s):  
Effects Of Temperature ◽  
Growth And Reproduction

Effect of temperature and photoperiod on growth and reproduction of Helix aspersa var. maxima

1998 ◽  
Vol 130 (3) ◽  
pp. 367-372 ◽  
Author(s):  
S. JESS ◽  
R. J. MARKS
Keyword(s):  
Helix Aspersa ◽  
Egg Laying ◽  
Effect Of Temperature ◽  
Low Light ◽  
Long Day ◽  
Artificial Photoperiod ◽  
Two Temperatures ◽  
Effects Of Temperature ◽  
Secretory Products ◽  
Growth And Reproduction

Growth and reproduction of the snail Helix aspersa (Müller) var. maxima were examined at four combinations of temperature and artificial photoperiod and in transparent and opaque containers at two temperatures for over 40 weeks. Effects of temperature on both processes predominated. However, following 10 weeks of oviposition at optimum temperature (20°C), absence of photoperiod inhibited egg-laying throughout a further 15 weeks. Following inhibition of oviposition, the albumen gland atrophied, indicating the storage of secretory products.Snail growth was improved by rearing in opaque rather than transparent containers in a long-day photoperiod. Snail oviposition was unaffected by container type throughout a 28-week period, demonstrating an acute perception of photoperiodicity by snails maintained at low light intensity.

Photoperiod and temperature regulation of the life history of Porphyra columbina (Rhodophyta, Bangiales) from central Chile

1986 ◽  
Vol 64 (9) ◽  
pp. 1867-1872 ◽  
Author(s):  
M. Avila ◽  
B. Santelices ◽  
J. McLachlan
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Temperature Regulation ◽  
Optimum Conditions ◽  
Central Chile ◽  
History Of ◽  
Effects Of Temperature ◽  
Growth And Reproduction

The effects of temperature (10, 15, 20 °C) and photoperiod (8:16, 12:12, 16:8 (hours of light: hours of dark)) on the growth and reproduction of different stages in the life history of Porphyra columbina Montagne were assessed. The conchocelis phase had higher growth rates at 12 h light:12 h dark, 45 μmol m−2 s−1, and 15 °C. Under all the temperatures and photoperiods tested, the conchocelis phase could propagate either by monospores or vegetative fragmentation. Conchosporangia were formed only at 10 °C and 8 h light:16 h dark or at 15 °C and either 8 h light:16 h dark or 12 h light:12 h dark. Long photoperiods inhibited conchosporangia formation at all temperatures tested with the exception of 20 °C and 16 h light:8 h dark, where sporangia was formed once. Conchospores were released when the temperature was decreased (15 to 10 °C) maintaining the photoperiod. Conchospore germination occurred under the three photoperiods and temperatures tested. Growth of juvenile fronds was maximum at 15 °C and either 12 h light:12 h dark or 16 h light:8 h dark. Fronds formed carpospores and spermatia at 15 °C and 16 h light:8 h dark only. With optimum conditions the life history was completed in 60 days. Spermatia had three chromosomes (n = 3).

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