Objective: To understand the distribution and characteristics of historical snail environments in Baoshan District, Shanghai City, so as to provide the reference for adjusting and formulating the monitoring program of the snail situation in the future.
Methods: A retrospective survey and a field survey were conducted to collect the information of historical snail environments and set up the database. The distribution and characteristics of them were analyzed.
Results: There were 53 historical snail environments which distributed in three towns, and the accumulative area was 1 635 530 m in Baoshan District, Shanghai City. Class I, II, III and IV accounted for 73.58%, 5.66%, 16.98% and 3.77% respectively. The complete transformation (Class I and Class II) was done in 42 places which covered the area of 1 622 043 m, in which Class I environments and Class II environments accounted for 79.25% and 99.18% of the total, respectively.
Conclusions: There has been a great change in the historical snail environments in Baoshan District, Shanghai City. The information of the field investigation should be enriched and updated at different times to guide the investigation of snails in the future.
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| http://dx.doi.org/10.16250/j.32.1374.2017228 | DOI Listing |
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