TABLE 1.

List of identified compounds in the nest (N), web (W), and spider (S) volatilomes of the different sampling sites Otavi, Windhoek, and Stampriet with known antimicrobial activity.

					Otavi			Windhoek			Stampriet
Compound	Class	Molecular Formular	Antimicrobial Activity	Compound Origin	N	W	S	N	W	S	N	W	S
1-Heptanal	Aldehyde	C7H14O	b, f	p						×
2-Ethylhexanol	Alcohol	C8H18O	b, f	p, f				×	×		×	×
Acetophenone	Ketone	C8H8O	b	?	×			×
1-Non-anal	Aldehyde	C9H18O	b, f	p	×						×
Levomenthol	Alcohol	C10H20O	b, f	p		×
2-Decanone	Ketone	C10H20O	b, f	p, b				×			×
Dodecane	Alkane	C12H26	b, f	p, b							×
1-Decanal	Aldehyde	C10H20O	b, f	p	×	×
1,3-Benzothiazole	Benzothiazole	C7H5NS	b, f	p	×	×		×
1-Undecanol	Alcohol	C11H24O	b	?								×
1-Dodecene	Alkene	C12H24	b	p							×
1-Tridecene	Alkene	C13H26	b	p, a	×	×		×	×		×
2-Ethyl-3-hydroxyhexyl 2-methylpropanoate	Carboxylic Acid	C12H24O3	b, f	p	×
1-Tetradecene	Alkene	C14H28	b, f	p, f			×
1-Dodecanal	Aldehyde	C12H24O	b, f	p							×
Nerylacetone	Ketone	C13H22O	b	p	×	×						×
1-Dodecanol	Alcohol	C12H26O	b	p		×	×	×			×
Pentadecane	Alkane	C15H32	b, f	a, i							×	×
Myristic acid	Carboxylic Acid	C14H28O2	b, f	p	×						×
Heneicosane	Alkane	C21H44	b	p							×	×
Docosane	Alkane	C22H46	b, f	p							×	×

The antimicrobial activity of the VOCs was shown against bacteria (b) and/or fungi (f). The VOCs originated from plants (p),insects (i), algae (a), bacteria (b), and/or fungi (f). Antimicrobial activities and origins are based on literature data (references in Supplementary Table 2). Detection of VOCs in the samples is indicated by “ × ”.