Table 11. Plankton species estimates for Gulf of Alaska, Bering Sea and the Arctic Ocean (numbers should be considered minimum estimates).

Taxa	Gulf of Alaska planktona	Bering Sea planktonb	Bering Sea zooplanktonc	Arctic Oceand
Radiolaria	116	24		40
Chlorophyta		5
Foraminifera		111		3
Dinoflagellates	14	16
Cnidaria	42	21	41	73
Ctenophora	3	1	1	13
Annelida	9	1	17	6
Crustacea	152	139	235	203
Mollusca	9	1	8	5
Chaetognatha	5	6	6	10
Urochordata	4	2	2	4
Total	354	327	310	357

Notes:

^aSambrotto RN, Lorenzen CJ (1986) Chapter 9. Phytoplankton and primary production. In: Hood D, Zimmerman S, editors. Gulf of Alaska, physical environment and biological resources. Washington, D.C.: NOAA Ocean Assessments Division, Alaska Office. pp. 249-282. Cooney RT (1986) Chapter 10. Zooplankton. In: Hood D, Zimmerman S, editors. Gulf of Alaska, physical environment and biological resources. Washington, D.C.: NOAA Ocean Assessments Division, Alaska Office. pp. 285-303.

^bMotoda S, Minoda T (1974) Plankton of the Bering Sea. In: Hood DW, Kelley EJ, editors. Oceanography of the Bering Sea with emphasis on renewable resources: Institute of Marine Sciences, University of Alaska Fairbanks. pp. 207-241.

^cCooney RT (1981) Bering Sea zooplankton and micronekton communities with emphasis on annual production. In: Hood DW, Calder JA, editors. The eastern Bering Sea shelf: Oceanography and resources Vol. 2. Seattle: University of Washington Press. pp. 947-974.

^dSirenko BI (2001) List of species of free-living invertebrates of Eurasian Arctic seas and adjacent deep waters. Explorations of the Fauna of the Seas 51(59). (Plus unpublished data from Russ Hopcroft).