Diatom record of progressive anthropopressure in the Gulf of Gdańsk and the Vistula Lagoon

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Characteristic features of anthropogenic diatom assemblage zones distinguished in the cores from the Gulf of Gdańsk

Diatom Assemblage Zone	Depth [cm]	Diversity number of taxa/number of genera	State of diatoms
2/2001-III Thalassiosira levanderi – Pauliella taeniata – Stephanodiscus hantzschii DAZ	19–0	116/41	good
3/2001-IV Amphora pediculus – Cocconeis neothumensis DAZ	20–0	106/30	good + some broken valves
4/2001-V Pauliella taeniata – Cyclotella spp. – Stephanodiscus spp. DAZ	18–0	146/47	good + some broken valves
6/2001-V Thalassiosira levanderi – Opephora krumbeinii – Cyclotella spp. DAZ	25–0	144/45	good + some broken valves
7/2001-IV Thalassiosira levanderi – Skeletonema marinoi – Pauliella taeniata DAZ	20–0	85/31	good

Characteristic features of anthropogenic diatom assemblage zones distinguished in the cores of the Vistula Lagoon

	Diatom Assemblage Zone	Depth [cm]	Diversity number of taxa/number of genera	State of diatoms
ZW 1-IV	Cyclotella choctawhatcheeana – Cyclotella meneghiniana – Stephanodiscus hantzschii – Staurosirella pinnata DAZ	10–0	58/23	good + some broken valves
ZW 4-IV	Aulacoseira granulata – Fragilaria heidenii – Stephanodiscus neoastraea DAZ	30–0	22/11	poor + many broken valves
ZW 8-IV	Fallacia forcipata – Amphora spp. – Cocconeis spp. – Fragilaria martyi DAZ	48–0	59/29	good
ZW 10-IV	Cyclotella meneghiniana – Fragilaria martyi DAZ	30–0	67/30	good
ZW 11-IV	Cyclotella meneghiniana – Staurosira venter – Aulacoseira granulata DAZ	17–0	26/17	poor
ZW 12-IV	Fragilaria sopotensis – Opephora guenter-grassii – Amphora spp. – Cocconeis spp. DAZ	52–0	85/29	good + some broken valves
ZW 14-IV	Opephora mutabilis – Amphora pediculus – Fragilaria martyi – Staurosira spp. DAZ	30–0	74/38	good + some broken valves
ZW 15-III	Staurosira venter – Fragilaria martyi – Aulacoseira granulata DAZ	20–0	19/13	poor

Changes in species composition in anthropogenic taphocoenoses of the Gulf of Gdańsk

DAZ	2/2001-III	3/2001-IV	4/2001-V	6/2001-V	7/2001-IV
Number of genera	↓10	↓8	↓7	↓3	↓18
Number of taxa	↓71	↓38	↓30	↓30	↓65

Changes in species composition in anthropogenic taphocoenoses of the Vistula Lagoon

DAZ	ZW 1-IV	ZW 10-IV	ZW 14-IV	ZW 4-IV	ZW 11- IV	ZW 15-III	ZW 8-IV	ZW 12-IV
Number of genera	↓3	↓2	↑2	↓2	↑1	↓5	0	↑3
Number taxa	↓7	↓25	↓37	↓9	↓4	↓10	↓9	↑10

Parameters of the analyzed cores

Region	Core Nb	φ	λ	Water depth [m]	Lithology
Gulf of Gdańsk	2/2001	54°30.658′N	18°42.768′E	30.0	silt, black (N1), at a depth of 8 cm single shells of Macoma, HCl–;
	3/2001	54°33.640′N	18°44.913′E	54.5	muddy sand, dark-grey (N2), HCl–;
	4/2001	54°31.083′N	18°41.349′E	29.8	silt, black (N1), at the top - admixture of sand with grains of gravel; single shells of Macoma, HCl–;
	6/2001	54°33.282′N	18°47.938′E	62.0	silty mud, black (N1), organic matter, HCl–;
	7/2001	54°31.008′N	18°52.569′E	65.0	silty mud, black (N1), organic matter, single shells of marine mollusks above a depth of 20 cm, HCl–;
Vistula Lagoon	ZW 1	54°15.75′N	19°23.416′E	2.1	silty mud, black (N1) and olive-black (5Y 2/1);
	ZW 4	54°18.666′N	19°21.583′E	2.7	silty mud, black (N1), HCl–;
	ZW 8	54°22.448′N	19°27.536′E	2.2	mud dark yellowish brown (10YR 4/2), HCl–;
	ZW 10	54°19.631′N	19°31.280′E	1.8	mud, HCl–;
	ZW 11	54°22.1′N	19°43.183′E	3.4	silty mud, green-black, (5GY 2/1) and dark-green (5GY 4/1);
	ZW 12	54°25.566′N	19°36.366′E	2.2	silty mud, green-black (5GY 2/1), HCl–;
	ZW 14	54°22.333′N	19°40.20′E	2.5	sandy mud, with admixture of fine sands, numerous shells of freshwater mollusks, HCl–;
	ZW 15	54°26.40′N	19°43′E	4.3	silty mud, grey-black (N2) and green-black (5G 2/1)