Russian Journal of Marine Biology, Vol. 28, Suppl. 1, 2002, pp. S56–S63.
Original Russian Text Copyright © 2002 by Biologiya Morya, Petryashev.
1063-0740/02/2801-S $27.00 © 2002
The areas investigated by us are of particular inter-
est to biogeographers: the boundary between the
Paciﬁc boreal and Arctic faunas lies here. Therefore,
biogeographic analysis of individual taxa inhabiting
this region has been performed by many investigators.
An extensive review of these researches was given by
Kussakin . However, the results of these researches
often differ markedly. Thus, the boundary between the
Paciﬁc boreal region and the Arctic region (or the sub-
region of the Arcto-Atlantic region) is drawn either in
the northern Bering Sea [3, 17], through the Bering
Strait , in the southern Chukchi Sea , or some-
times even in the more northerly areas of the Chukchi
Sea . Such differences may be due to the geo-
graphic distribution patterns of individual taxa (in each
biogeographic analysis, the above authors investigated
a different group of organisms), as well as to the
approaches and views of the authors themselves.
Therefore, it has become necessary to consider the dis-
tribution of several orders of Malacostraca, both pre-
dominantly epibenthic (anomurans and isopods) and
nektobenthic (leptostracans and mysids), which, owing
to their motility, can respond relatively quickly to envi-
According to distribution, leptostracans, anomu-
rans, mysids, and isopods that inhabit the northern
(shelf) part of the Bering Sea, the Chukchi, and East
Siberian seas, and the adjoining areas of the continental
slope can be united into 15 biogeographic groups. The
classiﬁcation and type ranges of these groups corre-
spond to those earlier proposed by Kussakin , with
the addition of two more groups: arctic-boreal and
1. Arctic species (18 species)—mysids
2. Widespread boreal-arctic species (3 species)—
3. Widespread highboreal-arctic species (2 spe-
4. Arctic-boreal species (2 species)—mysids
These species have a circumpo-
lar distribution in the Arctic Ocean and penetrate into
the coldest areas of the high boreal subregions: in the
Arcto-Atlantic, they occur to the north of the line of the
Labrador Peninsula—Finmarken (Norway), in the
North Paciﬁc to the north of Cape Navarin (Asiatic
coast)—Prince of Wales Cape in Alaska (Bering Strait)
and are also encountered in some bays on the coast of
the Koryak upland region;
was recorded in
lakes up to Central Europe and the Northeast USA.
Leptostraca, Mysidacea, Isopoda, and Decapoda (Anomura)
(Crustacea, Malacostraca) of the Chukchi Sea and Adjacent
Waters: Biogeography and Fauna Formation
V. V. Petryashev
Zoological Institute, Russian Academy of Sciences, St. Petersburg, 199034 Russia
Received May 15, 2001
—Data on the distribution of 72 species of Leptostraca, Decapoda: Reptantia: Anomura, Mysidacea,
and Isopoda in the northern Bering Sea, the Chukchi and East Siberian seas, and the adjacent areas of the con-
tinental slope in the Arctic basin at depths less than 500 m were used for biogeographic analysis. According to
distribution, these species can be united into 15 biogeographic groups. The hydrological regime, primarily, the
distribution of waters of different origin in the investigated regions, governs the distribution of different biogeo-
graphic groups of crustaceans. Paciﬁc boreal and subtropic-boreal species mostly inhabit the southern part of
the Chukchi Sea, coastal waters off Alaska to Point Barrow, and the central region of this sea to the Herald Bank.
For these taxa, the boundary between the Paciﬁc and Arctic faunas is in the Chukchi Sea crossing from Cape
Serdtse Kamen and Point Barrow to the area west of the Herald Bank. Possible pathways and the major stages
of formation of the fauna of the investigated crustaceans for the last 18000 years are discussed.
Malacostraca, fauna, biogeographty, Arctic, Bering Sea.