Effects of food concentration on population growth, body size, and egg size of the freshwater rotifer Brachionus angularis

Abstract

Abstract: With the food Chlorella pyrenoidosa and the method of population accumulative culture, the effects of food concentration on the population growth, body size, and egg size of the freshwater rotifer Brachionus angularis were studied. The results showed that there were very significant effects of food concentrations on the population growth rate, body size and egg size. The relationship between the population growth rate and the food concentration was curvilinear correlation. When the food concentration was 8.2453?10⁶cells穖L^-1, the population growth rate reached it's maximum, 0.6085d-1. Body size tended to enlarge with increasing food concentration. At the intermediate range of food levels between 6.0?10⁶ cells穖L^-1 and 9.0?10⁶ cells穖L^-1, the egg volume was larger than those at the other food concentrations.

Key words: Brachionus angularis, Food concentration, Population growth rate, Body size, Egg size, leaf area index, Penman-Monteith equation, scaling up, evapotranspiration

CLC Number:

S963.21⁺4

HU Haoyuan, XI Yilong, GENG Hong . Effects of food concentration on population growth, body size, and egg size of the freshwater rotifer Brachionus angularis[J]. Chinese Journal of Applied Ecology, 2002, (7): 875-878.

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