ISSN 1063-0740, Russian Journal of Marine Biology, 2006, Vol. 32, No. 4, pp. 259–264. © Pleiades Publishing, Inc., 2006.
Original Russian Text © S.Sh. Dautov, 2006, published in Biologiya Morya.
Common echinoderm species of the Peter the Great
Bay have planktotrophic larva, carrying out distribution
and feeding functions. The ability to navigate is limited
in such larvae, but they stay well in the water column,
and can be transferred by currents at signiﬁcant dis-
tances and in this way facilitate areal expansion. Plank-
totrophic larvae are speciﬁed by exotrophic feeding ,
due to which the population of bottom invertebrates
receives an additional nutrition resource.
Formerly, we published quantitative data on the dis-
tribution and dynamics of the number of echinoderm
larvae at the Southern region of the Far East Marine
Reserve and adjacent areas [1, 2, 5]. Benthic samples
also taken in the studied water area in 1996–1997
enabled us to compare data on the distribution of larvae
and adult individuals.
MATERIAL AND METHODS
Distribution parameters of adult individuals of brit-
tle stars were obtained as a result of determination of
the number and size structure of common species of
brittle stars collected with a Van Veen grab (0.11 m
catch area) taken from the station grid in 1996–1997
(Fig. 1). The samples were taken in 3 replications at
each station; the results of analysis were averaged.
Plankton samples were taken by Juday net in the sum-
mer–autumn season in 1996 and in autumn 1997. The
vertical distribution of larvae in the water column was
derived from three layers: 1st (0–10 m), 2nd (10–20 m),
and 3rd (20 m–bottom).
Patterns of distribution of adult echinoderms and
larvae were made by SURFER v.8 software; correlation
coefﬁcients were calculated using STATISTICA 5.1.
The sea star
the sea urchins
and four species of the brittle stars,
were recorded in bottom samples.
Low density populations of the sea star
occurred in the southeastern part of the surveyed area
and in the immediate vicinity of the outlet of the
Tumannaya River (Fig. 2A). Larvae of Asteriidae fam-
ily occurred from July to September 1996. In July, the
maximum number of larvae reached 900 ind/m
1st layer and almost coincided with the maximum of
the bottom distribution of the sea stars (Fig. 2B); the
number of larvae was less in deeper layers, 560 ind/m
in the 2nd layer and 140 ind/m
in the 3rd; the maxi-
mum number of larvae was recorded just a little to the
south from Furugelm Isl. In August, the number of lar-
vae of the Asteriidae family was much lower and the
area of their occurrence almost completely coincided
with the water area conﬁned between 10 and 50 m iso-
baths. In September, the larvae of sea stars of the
Asteriidae family were recorded along the coast from
Sivuchya to Kalevala Bay with a density up to
. In October 1997, they occurred over the
entire water area by wide strips with a density up to
Distribution of Echinoderms and Their Larvae
in the Southwestern Peter the Great Bay, Sea of Japan
S. Sh. Dautov
Institute of Marine Biology, Far East Division, Russian Academy of Sciences, Vladivostok, 690041 Russia
Received February 9, 2006
—Based on results of processing planktonic and benthic samples collected in 1996 and 1997, a spatial
distribution of echinoderms in the bottom and of their larvae in the plankton were collated for the water area of
the Southern region of the Far Eastern State Biosphere Marine Reserve. Some correlation between distributions
of the adult and larval sea star
in July was revealed. At the same time, there was no correla-
tion between distributions of larvae and adult individuals of the brittle star
and sea urchin
, which are most abundant in the area. The size structure of bottom populations of the brit-
in the studied area was assessed. The correlation coefﬁcient between the
distribution of young-of-the-year and the population density was 0.47 in
and 0.74 in
tively, which implied a selective settling of larvae of those species in areas inhabited by adult brittle stars.
Recruitment of bottom populations from 1996 spawning was 5% in
and 3.3% in
population ecology, benthos, plankton.