Population dynamics of breeding seabirds and diet of common breeding seabirds along the coast of Zhejiang Province, China.

Finally, based on the location information of the target species: Chinese Crested Tern, Black tailed Tern, Brown winged Tern, Pink Tern, Big Crested Tern, and Black naped Tern, the content that is not in the breeding season (April September) is filtered out, and obvious duplicate information is deleted according to latitude, longitude, and observation time.

Due to the statistics of citizen science data, the increase and overlap of bird watching enthusiasts will also result in data overlap. Analyze the diet of black tailed gulls and brown winged terns, including fish and arthropods, at the ASV level. Classify and analyze using both scientific and species levels. Delete unclassified species, perform sequence analysis, and calculate statistics using RFO and RRA parameters.