Articles

Title:	Equivalence of rates of growth and egg production of Pseudocalanus
Authors:	Dzierzbicka-Głowacka Lidia
Abstract:	The equivalence of rates of growth and egg production is analyzed for well-fed females of Pseudocalanus from Puget Sound (Washington, USA) and from the southern North Sea. The hypothesis is tested using published data on the Pseudocalanus species. The growth rates of the copepodite stages for species from these two regions as a function of temperature and food concentration were used. Quantitative expressions describing the effects of temperature and the cephalothorax length of females on potential reproductive rate were compared. Food-saturated egg production was computed as the mean number of eggs per sac divided by 1.25 times the embryonic duration at the given temperature. The calculations were done based on experimental data from the literature for some geographically separate populations of Pseudocalanus from southwest Baffin Island, Nova Scotia, Long Island Sound, Scotland, and the southern North Sea and adjacent waters. These values were compared with the average number of eggs produced per day by one female obtained here as a function of growth rate, i.e., multiplying exp gmax – 1 from the growth rate equation by Wfemale/Wegg. The combined effect of food concentration and temperature as a function of these two parameters on egg production (reduced by food limitation) was also established for Pseudocalanus from Puget Sound. These assumptions and estimations appear to predict the temperature-length of female dependent daily rates of egg production of well-fed females of Pseudocalanus spp. for the above waters. Suggestions are made as to how to obtain and present data to test this hypothesis more thoroughly.
DOI:
Type of paper:	Original research paper
Pages:	19 to 32
Cytation:	Dzierzbicka-Głowacka L., 2005, Equivalence of rates of growth and egg production of Pseudocalanus, Ocean. Hydrob. Studies, 34(4): 19-32
Keywords:	Pseudocalanus spp., egg production, growth rate
Year:	2005
Category:
Download:	Download file "124.pdf"