Table 2.

Concentration of nutrients for the near-seabed layer averaged for all of the sampling sites of the given dumpsites (before the slash) versus data coming from the reference points (after the slash); “<” if a result is below the lower limit of quantification.

Sea Dumping Site	Season	N-tot (mg∙dm−3)	N-NO3− (mg∙dm−3)	N-NH4+ (mg∙dm−3)	P-tot (mg∙dm−3)	P-PO4−3 (mg∙dm−3)
Gdynia	Spring	0.15/0.14	<0.003/<0.003	0.017/< 0.003	0.028/0.026	0.032/0.047
	Summer	0.33/0.28	0.025/0.032	0.025/0.030	0.032/0.030	0.022/0.020
	Autumn	0.13/0.16	0.040/0.084	0.013/0.017	0.031/0.060	0.024/0.055
	Winter	0.14/0.13	0.052/0.050	<0.003/0.009	0.024/0.030	0.020/0.029
Gdańsk	Spring	0.16/0.14	<0.003/<0.003	0.011/<0.003	0.029/0.027	0.011/0.007
	Summer	0.32/0.29	0.028/0.026	0.027/0.030	0.027/0.024	0.022/0.016
	Autumn	0.12/0.11	0.027/0.019	0.019/0.027	0.015/0.010	0.009/0.010
	Winter	0.14/0.11	0.047/0.045	<0.003/<0.003	0.023/0.017	0.018/0.013
DCT	Spring	0.19/0.23	0.035/< 0.003	0.009/<0.003	0.079/0.091	0.062/0.036
	Summer	0.29/0.21	0.059/0.043	0.025/<0.003	0.075/0.048	0.066/0.042
	Autumn	0.12/0.14	0.049/0.048	0.009/<0.003	0.066/0.069	0.060/0.062
	Winter	0.12/0.14	0.046/0.031	<0.003/<0.003	0.057/0.040	0.054/0.034
Darłowo	Spring	0.18/0.17	<0.003/0.007	<0.003/<0.003	0.026/0.033	0.014/0.021
	Summer	0.34/0.28	<0.003/<0.003	0.008/0.004	0.018/0.018	<0.009/0.016
	Autumn	0.19/0.18	0.058/0.021	0.008/0.015	0.027/0.025	0.018/0.015
	Winter	0.17/0.20	0.126/0.109	<0.003/<0.003	0.024/0.025	0.022/0.019