Effects of food concentration on egg-production rates of two species of Pseudocalanus: laboratory observations

1989 ◽  
Vol 130 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Sigrun Huld Jonasdottir
Keyword(s):  
Egg Production ◽  
Food Concentration ◽  
Production Rates ◽  
Effects Of Food Concentration

scholarly journals A review of the life cycles and life-history adaptations of pelagic tunicates to environmental conditions

2011 ◽  
Vol 69 (3) ◽  
pp. 358-369 ◽  
Author(s):  
Don Deibel ◽  
Ben Lowen
Keyword(s):  
Life History ◽  
Environmental Conditions ◽  
Generation Time ◽  
Egg Production ◽  
Food Concentration ◽  
Life Cycles ◽  
Population Doubling ◽  
Event Scale ◽  
Generation Times ◽  
Doubling Times

Abstract Deibel, D., and Lowen, B. 2012. A review of the life cycles and life-history adaptations of pelagic tunicates to environmental conditions. – ICES Journal of Marine Science, 69: 358–369. Phylogeny, life cycles, and life-history adaptations of pelagic tunicates to temperature and food concentration are reviewed. Using literature data on lifetime egg production and generation time of appendicularians, salps, and doliolids, rmax, the maximum rate of lifetime reproductive fitness, is calculated as a common metric of adaptation to environmental conditions. The rmax values are high for all three groups, ranging from ∼0.1 to 1.9 d−1, so population doubling times range from ∼8 h to 1 week. These high values of rmax are attributable primarily to short generation times, ranging from 2 to 50 d. Clearly, pelagic tunicates are adapted to event-scale (i.e. days to weeks) rather than seasonal-scale changes in environmental conditions. Although they are not closely related phylogenetically, all three groups have a unique life-history adaptation promoting high lifetime fitness. Appendicularians have late oocyte selection, salps are viviparous, and doliolids possess a polymorphic asexual phase. There has been little research on hermaphroditic appendicularians, on large oceanic salps, and on doliolids generally. Research is needed on factors regulating generation time, on the heritability of life-history traits, and on age- and size-specific rates of mortality.

Effects of food concentration and temperature on development, growth, reproduction and survival of the copepod Pseudodiaptomus euryhalinus

2014 ◽  
Vol 22 (6) ◽  
pp. 1911-1923 ◽  
Author(s):  
M. A. Anzueto-Sánchez ◽  
B. Barón-Sevilla ◽  
B. Cordero-Esquivel ◽  
A. Celaya-Ortega
Keyword(s):  
Food Concentration ◽  
Effects Of Food Concentration
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