Table 1.

An example of datasets compiled for the Baltic Sea catchment (Hong et al. 2012)

Item	Bothnian Bay	Bothnian Sea	Gulf of Finland	Gulf of Riga	Kattegat	Baltic Proper	Danish Straits
Area (km2)	269 576	230 953	418 980	136 179	90 081	573 368	27 357
Population density (persons km−2)
Total	4.9	11.5	26.7	27.7	36.2	94.5	172.7
Urban	3.2	8.1	18.9	18.5	29.4	61.5	148.2
Rural	1.7	3.4	7.8	9.2	6.8	33.0	24.6
Livestock density (animals km−2)
Cattle	1.1	1.5	2.6	7.4	12.2	13.1	32.1
Pigs	1.0	2.7	3.3	8.3	62.5	37.5	150.9
Poultry	30.0	28.3	130.4	73.5	94.1	357.2	341.1
Sheep	0.1	0.4	0.2	0.5	2.0	1.3	6.9
Crop production (kg km−2 year−1)
Barley	2047	4245	2248	5093	19 035	10 988	58 853
Wheat	63	1796	1204	6674	25 990	23 140	120 255
Maize (green)	0	0	2902	1883	8856	25 061	126 952
Oats	1120	2386	1202	1331	5578	3736	3759
Rye	20	140	177	1937	1683	9048	9237
Other cereal	32	238	68	1287	1909	13 573	4662
Potatoes	1344	1468	2908	12 709	8671	36 478	21 013
Rape and turnip	88	222	172	985	2146	3915	18 184
Sugar beet	103	3193	410	3831	6582	27 811	150 296
Fodder roots	0	0	21	1930	4071	6932	5966
Pulses	3	13	8	116	79	309	203
Leguminous plants	339	88	960	4653	360	6620	2577
Fruits and berries	17	24	67	469	223	5996	2499