Alfred Wegener Institute for Polar and Marine Research, Postfach 12 01 61, Columbusstrasse, W-27568 Bremerhaven, Germany
Seasonal size variation in the predatory cladoceran Bythotrephes cederstroemii in Lake Michigan
Article first published online: 30 MAY 2006
Volume 31, Issue 1, pages 97–108, February 1994
How to Cite
BURKHARDT, S. (1994), Seasonal size variation in the predatory cladoceran Bythotrephes cederstroemii in Lake Michigan. Freshwater Biology, 31: 97–108. doi: 10.1111/j.1365-2427.1994.tb00842.x
- Issue published online: 30 MAY 2006
- Article first published online: 30 MAY 2006
- (Manuscript accepted 16 August 1993)
- 1Dry weight, body length and spine length were measured for the exotic cladoceran Bythotrephes cederstroemii collected from offshore and inshore stations in southeastern Lake Michigan. Average dry weight of each developmental stage exhibited seasonal variation by a factor of more than 5.
- 2Mean dry weight of Bythotrephes was closely correlated with water temperature. Contrary to the inverse relationship between water temperature and body size frequently observed for other invertebrates, the dry weight of Bythotrephes increased at higher ambient temperatures.
- 3No significant correlation was observed between abundances of major zooplankton taxa and the dry weight of Bythotrephes. An indirect effect of temperature on prey consumption may cause seasonal variation in dry weight of Bythotrephes in Lake Michigan.
- 4Distances between adjacent pairs of barbs, added to the caudal spine with each moult, are significantly shorter in Bythotrephes which produce resting eggs. Less material investment in the exoskeleton of sexually reproducing females was observed in favour of growth and reproduction.