Table 3.

Microbial taxonomic groups that were only detected in the bottom sediment samples from the sand mining sites.

Sample	Class	Family	Genus
Bottom sediments	Actinobacteria	Bifidobacteriaceae	Bifidobacterium
	Fimbriimonadia	Fimbriimonadaceae	-
	Bacteroidia	Bacteroidaceae	Bacteroides
	Flavobacteriia	Cryomorphaceae	-
	Flavobacteriia	Cryomorphaceae	Cryomorpha
	Flavobacteriia	Cryomorphaceae	Owenweeksia
	Rhodothermi	Balneolaceae	Balneola
	Synechococcophycideae	Synechococcaceae	Prochlorococcus
	Bacilli	Planococcaceae	Sporosarcina
	Bacilli	Thermoactinomycetaceae	-
	Clostridia	Clostridiaceae	Alkaliphilus
	Clostridia	Clostridiaceae	Geosporobacter
	Clostridia	Lachnospiraceae	-
	Clostridia	Lachnospiraceae	Coprococcus
	Clostridia	Lachnospiraceae	Lachnospira
	Clostridia	Peptostreptococcaceae	-
	Clostridia	Ruminococcaceae	Faecalibacterium
	Clostridia	Ruminococcaceae	Ruminococcus
	Clostridia	Veillonellaceae	Dialister
	Clostridia	Veillonellaceae	Megamonas
	Clostridia	Acidaminobacteraceae	-
	Fusobacteriia	Fusobacteriaceae	u114
	Alphaproteobacteria	Methylocystaceae	Pleomorphomonas
	Alphaproteobacteria	Rhodobiaceae	Afifella
	Alphaproteobacteria	Rhodobacteraceae	Marivita
	Alphaproteobacteria	Rhodobacteraceae	Thalassobius
	Alphaproteobacteria	Rhodospirillaceae	Novispirillum
	Alphaproteobacteria	Rhodospirillaceae	Rhodospirillum
	Alphaproteobacteria	AEGEAN_112	-
	Deltaproteobacteria	S25_1238	-
	Deltaproteobacteria	SAR324	-
	Gammaproteobacteria	Psychromonadaceae	-
	Gammaproteobacteria	Legionellaceae	Legionella
	Gammaproteobacteria	Legionellaceae	Tatlockia
	Gammaproteobacteria	Oceanospirillaceae	Oleispira
	AB16	A714017	SargSea-WGS
	Mollicutes	Mycoplasmataceae	Candidatus Hepatoplasma

The genus in bold is known to be involved in toxic chemical degradation or pathogenic pollution (see Results and Discussion).