Table 1
Life-table demography of offsprings produced by three K. quadrata morphotypes at four food concentrations (×106 cells·mL−1) (mean ± SE). 2PS: rotifer with two posterolateral spines; 1PS: rotifer with one posterolateral spine; 0PS: rotifer with none posterolateral spine. The different lowercase and capital letters represent significant differences among different concentrations and among three morphs, respectively. R0: net reproductive rate; rm: intrinsic rate of population growth; G0/G1/Gh: alternative measures of the generation time; PDH: population doubling time, AL: average lifespan.
| Parameters | Morphotype | Food concentration (×106 cells·mL−1) | |||
|---|---|---|---|---|---|
| 0.75 | 1.5 | 3.0 | 6.0 | ||
| R0 (ind.) | 2PS | 4.0 ± 0.7 | 3.4 ± 0.6 | 4.3 ± 0.9 | 3.3 ± 0.4 |
| 1PS | 2.8 ± 0.1 | 3.8 ± 0.3 | 3.7 ± 0.5 | 3.7 ± 0.9 | |
| 0PS | 3.5 ± 0.3 | 3.3 ± 0.3 | 2.4 ± 0.3 | 2.4 ± 0.2 | |
| rm (d−1) | 2PS | 0.013 ± 0.002 | 0.013 ± 0.004 | 0.012 ± 0.001 | 0.012 ± 0.001 |
| 1PS | 0.011 ± 0.001 | 0.014 ± 0.001 | 0.012 ± 0.001 | 0.012 ± 0.001 | |
| 0PS | 0.013 ± 0.001 | 0.012 ± 0.001 | 0.008 ± 0.001 | 0.009 ± 0.001 | |
| G0 (h) | 2PS | 114.1 ± 9.7 | 100.1 ± 7.9 | 112.6 ± 4.6 | 102.6 ± 5.8 |
| 1PS | 105.00 ± 8.9 | 108.5 ± 1.0 | 112.7 ± 8.5 | 119.6 ± 13.9 | |
| 0PS | 115.7 ± 11.7 | 85.5 ± 3.5 | 110.3 ± 9.7 | 110.8 ± 9.0 | |
| G1 (h) |
2PS | 101.9 ± 3.9 | 93.2 ± 3.6 | 118.0 ± 8.8 | 94.3 ± 2.7 |
| 1PS | 96.7 ± 13.6 | 95.1 ± 1.4 | 102.2 ± 3.8 | 107.2 ± 5.5 | |
| 0PS | 101.0 ± 5.2 | 105.8 ± 8.0 | 104.3 ± 5.2 | 103.6 ± 4.6 | |
| Gh (h) |
2PS | 91.3 ± 3.2 | 86.9 ± 3.3 | 93.9 ± 1.8 | 86.6 ± 2.6 |
| 1PS | 85.0 ± 9.6 | 83.7 ± 2.1 | 92.9 ± 3.5 | 96.2 ± 4.3 | |
| 0PS | 88.6 ± 4.6 | 96.6 ± 7.3 | 98.6 ± 5.4 | 97.0 ± 4.9 | |
| PDH (h) |
2PS | 56.1 ± 3.9 | 59.2 ± 4.4 | 59.9 ± 2.0 | 57.3 ± 1.7 |
| 1PS | 65.1 ± 13.6 | 51.0 ± 2.2 | 56.6 ± 1.9 | 61.7 ± 2.8 | |
| 0PS | 57.0 ± 3.5 | 62.6 ± 4.2 | 96.5 ± 10.7 | 85.3 ± 5.6 | |
| AL (h) | 2PS | 168.1 ± 10.9Aa | 132.0 ± 3.2Ab | 150.5 ± 9.0Aab | 133.0 ± 6.6b |
| 1PS | 126.6 ± 6.9B | 146.1 ± 8.4A | 146.3 ± 13.9AB | 140.9 ± 15.7 | |
| 0PS | 134.6 ± 4.4Ba | 106.7 ± 6.6Bb | 127.4 ± 7.9Ba | 128.9 ± 11.7a | |
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