Table 1. Estimated number of species, laboratories and scientists by major organism groups in the Baltic Sea.

	Number of species	Number of laboratories	Number of scientists
Bacteria	103–106 a	10	50
Phytoplankton	1,700 b	15	50
Phytobenthos	442 c	15	60
Zooplankton	1,199 d	30	50
Meiozoobenthos	569 d	<5	<10
Macrozoobenthos	1,476 d	13	15
Parasites of vertebrates	380 e	10	15
Fish	200 f	15–20	150
Seals	3 g	14	25
Seabirds	83 h	?	?

Sources:

^aEstimate: H. Kaartakallio, unpublished.

^b [36].

^c [51].

^dThis study.

^e [135], [156]–[158]. Includes also: A. Turovski, unpublished data.

^f [54], [134]–[136]. Includes lampreys.

^g [54].

^hC. Herrmann, unpublished. Includes species which have special relation with the Baltic marine environment (breeding, migration, wintering).