Table 2
Morphological characters of offsprings produced by three K. quadrata morphtypes at four food concentrations (×106 cells·mL−1) (mean ± SE). 2PS: rotifer with two posterolateral spine; 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.
| Parameters of offspring | Parent morphotype | Food concentration (×106 cells·mL−1) | |||
|---|---|---|---|---|---|
| 0.75 | 1.5 | 3.0 | 6.0 | ||
| Lorica length | 2PS | 77.4 ± 1.0a | 80.0 ± 0.9ab | 81.7 ± 1.5b | 79.5 ± 0.6Aab |
| 1PS | 79.3 ± 1.0 | 82.5 ± 2.4 | 82.7 ± 1.7 | 79.4 ± 1.1A | |
| 0PS | 79.4 ± 1.7 | 83.0 ± 1.8 | 83.1 ± 1.2 | 84.5 ± 1.4B | |
| Lorica width | 2PS | 47.1 ± 1.0A | 45.9 ± 0.7 | 49.1 ± 1.2 | 47.3 ± 0.7A |
| 1PS | 41.2 ± 0.6Ba | 45.6 ± 1.7b | 46.7 ± 0.8b | 44.0 ± 0.8Bb | |
| 0PS | 42.9 ± 1.9Ba | 47.9 ± 1.2b | 48.8 ± 0.8b | 47.6 ± 0.8Ab | |
| Posterior spine length | 2PS | 20.7 ± 0.9A | 20.7 ± 0.7A | 21.1 ± 0.7A | 20.7 ± 0.6A |
| 1PS | 20.3 ± 0.7Aab | 19.2 ± 0.8Aa | 21.9 ± 0.7Ab | 22.0 ± 0.8Ab | |
| 0PS | 23.3 ± 1.3Ba | 25.7 ± 1.8Ba | 32.1 ± 1.5Bb | 30.9 ± 1.0Bb | |
| Proportion of two-spined offspring (%) | 2PS | 96.2 ± 2.4A | 98.2 ± 1.8A | 99.5 ± 0.5A | 99.0 ± 0.9A |
| 1PS | 73.9 ± 6.3Ba | 88.2 ± 5.6Bb | 86.6 ± 8.8Bb | 95.7 ± 3.2Ac | |
| 0PS | 96.1 ± 2.1Aa | 78.6 ± 8.0Cb | 71.3 ± 10.3Cb | 75.4 ± 8.8Bb | |
| Proportion of single-spined offspring (%) | 2PS | 1.8 ± 1.8A | 1.8 ± 1.8A | 0.5 ± 0.5A | 0.45 ± 0.45A |
| 1PS | 21.9 ± 5.1Ba | 8.9 ± 2.6Bb | 10.1 ± 3.6Bb | 3.9 ± 2.7Ab | |
| 0PS | 3.8 ± 2.1Aa | 17.8 ± 4.1Cb | 24.2 ± 2.1Cb | 20.7 ± 4.6Bb | |
| Proportion of unspined offspring (%) | 2PS | 2.0 ± 1.2 | 0.0 ± 0.0 | 0.0 ± 0.0 | 0.5 ± 0.45 |
| 1PS | 4.2 ± 3.0 | 2.9 ± 1.4 | 3.3 ± 3.3 | 0.4 ± 0.4 | |
| 0PS | 0.0 ± 0.0 | 3.6 ± 3.2 | 4.5 ± 2.4 | 3.9 ± 1.9 | |
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