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Experimental study of the interspecific competition b.tween two sib.ing marine herb.vorous rotifers in relation to food availab.lity and initial population density

引用

Acta Oceanologica Sinica 2012年第4期31卷 113-126页

作者： Divya S P Kathiresan K Asha P Sekar V Rajasekaran R Centre of Advanced Study in Marine b.ology Faculty of Marine SciencesAnnamalai University School of Environmental Studies Cochin University of Science and Technology

Our lab.ratory study concerns the competitive interaction b.tween two marine rotifer species b.a- chionus plicatilis and b.achionus rotundiformis at five algal （ Nannochloropsis salina） concentrations （0.4＊106 to 32.4x106 cells/ml） and at four initial inoculation densities （numerically, 100% b. pli- catilis; 75% b. plicatilis and 25% b. rotundiforrnis, 50% each of the two species; 25% b. plicatilis and 75% b. rotundiformis and 100% b. rotundiforrnis. The initial b.omass varied as 0.33 and 0.22 #g/ml for b. plicatilis and b. rotundiformis respectively. Experiments were performed at （25±1）C. population densities were enumerated and the medium was changed daily up to 8 d in the ex- periment. At the lowest food level tested, b. rotundiformis formed superior competitor than b. plicatilis, regardless of starting inoculation density. Generally when the food concentrations in- creased, b. plicatilis showed a greater increase in b.omass than b. rotundiforrnis. b. rotundiformis formed the largest in population growth, regardless of increasing food concentrations. When grown alone, b. plicatilis reached peak ab.ndances of （1.311 5±0.028） and （137.5±0.014） μg/ml at low and high food densities respectively. The corresponding values of b. rotundiformis were 0.724 5±0.016 and 18.15±0.021. The adverse effects of b. rotundiforrnis on the peak ab.ndances of b. plicatilis were ob.erved at the lowest food level and higher initial density. The rate of population growth in controls varied from （0.792±0.162） to （1.482±0.132） ttm/d for b. plicatilis and （0.445~0.041） to （0.856±0.012） μm/d for b. rotundiformis, depending on food level. When b.th species were intro- duced together, low food levels favoured higher ab.ndance of b. rotundiforrnis than b. plicatilis, suggesting that increased population density of the smaller b. rotundiforrnis was more successfull than larger b. plicatilis in b.ackish waters. Our work reveals that availab.e food （type and quan- tity） along with starting inoculat

关键词： competition food level b. plicatilis b. rotundiformis population density interspecificcompetition

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