SRS8492087 SAMN18353080 256318 metagenome collection_date 2020-04 env_broad_scale subclasses of biome env_local_scale shoreline env_medium estuarine water geo_loc_name China: Guangzhou host rodent rat lat_lon 23.13 N 113.27 E BioSampleModel MIMARKS.survey BioSampleModel MIGS/MIMS/MIMARKS.host-associated