Effects of sexual reproduction of the inferior competitor <i>Brachionus calycifl</i> orus on its fi tness against <i>Brachionus angularis</i> -- Journal of Oceanology and Limnology,2015,33(2):356-363

	Cite this paper:
	LI Chen, NIU Cuijuan. Effects of sexual reproduction of the inferior competitor Brachionus calycifl orus on its fi tness against Brachionus angularis[J]. Journal of Oceanology and Limnology, 2015, 33(2): 356-363

Effects of sexual reproduction of the inferior competitor Brachionus calycifl orus on its fi tness against Brachionus angularis

LI Chen, NIU Cuijuan

Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing 100875, China

Abstract:

Sexual reproduction adversely affects the population growth of cyclic parthenogenetic animals. The density-dependent sexual reproduction of a superior competitor could mediate the coexistence. However, the cost of sex may make the inferior competitor more vulnerable. To investigate the effect of sexual reproduction on the inferior competitor, we experimentally paired the competition of one Brachionus angularis clone against three Brachionus calycifl orus clones. One of the B. calycifl orus clones showed a low propensity for sexual reproduction, while the other two showed high propensities. The results show that all B. calycifl orus clones were excluded in the competition for resources at low food level. The increased food level promoted the competition persistence, but the clones did not show a clear pattern. Both the cumulative population density and resting egg production increased with the food level. The cumulative population density decreased with the mixis investment, while the resting egg production increased with the mixis investment. A trade-off between the population growth and sexual reproduction was observed in this research. The results indicate that although higher mixis investment resulted in a lower population density, it would not determinately accelerate the exclusion process of the inferior competitor. On the contrary, higher mixis investment promoted resting egg production before being excluded and thus promised a longterm benefit. In conclusion, our results suggest that mixis investment, to some extent, favored the excluded inferior competitor under fierce competition or some other adverse conditions.

Key words: sexual reproduction|competition|resting egg|Brachionus

Received: 2014-03-20 Revised: 2014-06-09

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