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Tidal replacement has a significant impact on the physiology and behavior of intertidal organisms. Infauna can establish a suitable microenvironment to adapt to intertidal environment through the behavioral process. In this experiment, the behavioral response of Perinereis aibuhitensis Grube to tidal alternation were studied by behavioral observation device. Three temperature grades (15℃, 20℃ and 25℃) and four time periods (T1: before ebb tide, T2: after ebb tide, T3: within 30 minutes after rising tide and T4: 30 minutes after rising tide) were set up for the experiment, with six replications for each experimental group. The results showed that at the same time period, the radial undulation frequency, radial undulation pumping rate, axial crawling velocity and the frequency of head-tail exchange of P. aibuhitensis Grube tended to increase with the increase of temperature, while the time of head-tail exchange tended to decrease. At the same temperature, the radial undulation frequency, axial crawling velocity, radial undulation pumping rate, radial undulation pumping efficiency, axial crawling time and the frequency of head-tail exchange of P. aibuhitensis Grube in T3 were higher than those of other time periods, while the time of one head-tail exchange was lower. There was no significant difference in all behavioral indexes between T1 and T4 (p>0.05). At 20℃, the radial undulation frequency and pumping rate of P. aibuhitensis Grube in T3 were higher than T1. At the same time period, the radial undulation time and axial crawling time of P. aibuhitensis Grube were at the maximum and minimum at 20℃, respectively. There was no significant difference in axial crawling velocity of P. aibuhitensis Grube at 15℃ and 20℃ in T1 and T3. However, at 25℃, the axial crawling velocity in T3 was significantly higher than T1 (p<0.05). The results indicate that the motion intensity of P. aibuhitensis Grube increased with the increase of temperature. The motion state of P. aibuhitensis Grube was better at 20℃. After ebb tide, it is an important time for P. aibuhitensis Grube to forage for sediment, and its axial crawling motion is relatively slow. At the beginning of the rising tide, the motion intensity of P. aibuhitensis Grube increased significantly. 30 minutes after the rising tide, the motion of P. aibuhitensis Grube gradually returns to a state similar to that before the ebb tide. P. aibuhitensis Grube can deal with the adverse effects of tidal replacement through a series of behaviors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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