Title: Comparative on the life history characteristics of Brachionus rubens and B.urceolaris
Abstract: The life history characteristics of Brachionus rubens and B.urceolaris whose taxonomical status remains controversy was compared at 18℃,23℃,28℃ and 33℃ by means of life table method and with 3.0×106 cells/mL of the algae Scenedesmus obliquus as food.The results showed that with the temperature increasing,the durations of pre-reproductive and reproductive periods,average lifespan,generation time and life expectancy at hatching of the two rotifer species decreased significantly,but the reverse was true for the intrinsic rate of population increase.The duration of post-reproductive period of B.rubens at 28℃ was similar to those at 23℃ and 33℃,and the duration of post-reproductive period of B.urceolaris at 28℃ was also similar to that at 33℃.Both the number of produced eggs and the net reproductive rate of B.rubens was the smallest at 33℃,but was similar at the other three temperatures.Both the number of produced eggs and the net reproductive rate of B.urceolaris was also the smallest at 33℃,but was the largest at 28℃.At 18℃,23℃ as well as 28℃,the duration of pre-reproductive period,the average lifespan,the life expectancy at hatching and the generation time of B.urceolaris were all significantly longer than those of B.rubens,but their durations of reproductive period were similar.At 33℃,the duration of reproductive period,the average lifespan,the life expectancy at hatching and the generation time of B.rubens were all significantly longer than those of B.urceolaris,but their durations of pre-reproductive period were similar.At all the four temperatures,the number of produced eggs,the intrinsic rate of population increase and the net reproductive rate of B.rubens were all significantly higher than those of B.urceolaris,but their durations of post-reproductive period were similar.B.rubens appeared to be an r-strategist because of its lower life expectancy,but higher reproductive and population growth rates.In contrast,B.urceolaris seemed to be a K-strategist for its lower reproductive and population growth rates,but higher life expectancy.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 3
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