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The rapid detection of biological toxicity of Marine pollution is of great significance to the emergency monitoring of sudden Marine water pollution accidents, the rapid investigation and evaluation of Marine environment ecological risks, and the protection of Marine environment. However, existing biological toxicity detection methods have a long toxic response time, and it is difficult to realize the rapid response of Marine pollutants. In view of this, this study has taken the active marine microalgae, Platymonas subcordiformis, as the test organism to study its mobility response to typical heavy metal pollutants Mercury（Hg）and Chromium（Cr）in seawater, in order to provide a basis for establishing a rapid detection method for marine biological toxicity. The results ha showed that within 2h, the motion parameters of the Platymonas subcordiformis, including movement mode, movement ability, and swimming velocity, exhibited significant response characteristics to 0.075~2.5mg/L Hg and 0.1~3mg/L Cr, and there was a good dose-response relationship between the motion parameters and the concentrations of the two independent heavy metals；The 2h-EC50 values of Hg and Cr obtained based on different motion parameters were 0.63~2.38mg/L and 0.60~2.49mg/L, respectively；Overall, among different motion parameters, the curve velocity（VSL）has the most sensitive response to the toxicity of heavy metals Hg and Cr. The 2h-EC50 values of Hg and Cr obtained using VSL as the response index are 0.63 and 0.60mg/L respectively. The above results are comparable to traditional toxicity tests（including microalgae 72-hour growth inhibition test, 24~48 hours photosynthesis inhibition test, and 96-hour fish death test）, and the toxicity response time is significantly reduced, indicating that microalgae motility as a new biological testing indicator can quickly and effectively evaluate the toxicity of marine heavy metal pollutants.
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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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