Body sizes, development rates, and genome sizes among Calanus species
- 181 Downloads
Data on embryonic and larval development times (D) of Calanus species are analysed using Bělehrádek’s temperature (T) function, D = a (T - α) b , with b = −2.05 as in previous studies. Among these species, α for embryonic duration varies directly with temperatures in their geographical ranges and a is related to egg diameter. Using α and b from embryonic durations, the fitted values of α for older stages are related to body sizes. Roughly estimated nucleus numbers in single adult females of C. finmarchicus, glacialis and hyperboreus were similar at 72 000, 85 000, and 96 000 respectively. Genome sizes (2C) of adult females are ca. 13 pg DNA in C. finmarchicus and pacificus, ca. 17 pg in C. sinicus, ca. 21 pg in C. helgolandicus and marshallae, and ca. 25 pg in C. glacialis and hyperboreus. These correspond roughly to body sizes and temperature-corrected development rates, quite precisely so in the sibling pair C. finmarchicus and C. glacialis, suggesting that, given similar nucleus numbers, there is nucleotypic control of whole-organism characteristics.
Key wordsCalanus copepoda DNA sizes development rates
Unable to display preview. Download preview PDF.
- Cavalier-Smith, T. (ed.), I985. The evolution of genome size. John Wiley & Sons, New York.Google Scholar
- Corkett, C. J., I. A. McLaren & J. -M. Sevigny, 1986. The rearing of the marine calanoid copepods Calanus finmarchius (Gunnerus), C. glacialis Jaichnov and C. hyperbereus Krøyer with comment on the equiproportional rule. Syllogeus (Nat. Mus. Can.) 58: 539–546Google Scholar
- Eriksson, S., 1973. The biology of the marine planktonic Copepoda on the West coast of Sweden. Zoon 1: 37–68.Google Scholar
- Grainger, E. H., 1963. Copepods of the genus Calanus as indicators of eastern Canadian waters. In M. J. Dunbar (ed.), Marine Distributions. Univ. Toronto Press, Toronto: 68–94.Google Scholar
- Matthews, J. B. L., 1967. Calanus finmarchicus S. L. in the North Atlantic. The relationships between Calanus finmarchicus S. Str., C. glacialis and C. helgolandicus. Bull, mar. Ecol. 6: 159–179.Google Scholar
- Peters, R. H., 1983. The ecological implications of body size. Cambridge University Press, Cambridge, England, 329 pp.Google Scholar
- Peterson, W. T., 1986. Development, growth, and survivorship of the copepod Calanus marshallae in the laboratory. Mar. Biol. 29: 61–72.Google Scholar
- Robins, J. H., & I. A. McLaren, 1981. Unusual variations in nuclear DNA contents in the marine copepod Pseudocalanus. Can. J. Genet. Cytol. 24: 529–540Google Scholar
- Woodhouse, C., 1971. A study of the ecological relationships and taxonomic status of two species of the genus Calanus (Crustacea: Copepoda). Ph.D. thesis, University of British Columbia, Vancouver, 145 pp.Google Scholar