TABLE 3.

Mean (±SE) values of sediment isotope composition from the anthropogenically impacted sites (North Beach) and low impacted sites (South Beach) in control (n = 6) and fertilized (n = 6) plots.

Isotopic composition	Site	July 2019	December 2019
			Control	Fertilized
δ15N	North Beach	3.32 ± 0.35	3.43 ± 0.45	3.51 ± 0.49
	South Beach	1.85 ± 0.30✱	1.08 ± 0.36✱	0.83 ± 0.46✱
δ13C	North Beach	−16.00 ± 1.00	−15.12 ± 0.26†	−15.03 ± 0.15
	South Beach	−14.77 ± 0.66	−14.45 ± 0.12 †	−15.21 ± 0.47✱✢

δ¹³C and δ¹⁵N are expressed as parts per thousands. ✱ indicates significant differences between impacted (NB) and non-impacted (SB) sites. ^† indicates significant seasonal differences between July and December, and ✢ indicates significant differences between control and fertilized plots.