ISSN 10674136, Russian Journal of Ecology, 2011, Vol. 42, No. 1, pp. 80–83. © Pleiades Publishing, Ltd., 2011.
Original Russian Text © L.V. Yanygina, 2011, published in Ekologiya, 2011, No. 1, pp. 73–76
In the past decades, reservoirs have become a major
factor of changes in the environment. The construc
tion of reservoirs solves a number of watermanage
ment and socioeconomic problems: energy produc
tion, improvement of shipping and water supply, flood
prevention, intensification of pisciculture and recre
ational activities. On the other hand, the resulting
transformation of the environment has negative con
sequences such as rearrangements in the fauna of the
water body and changes in living conditions for hydro
bionts (Savkin, 2000). These processes eventually lead
to the formation of a new type of aquatic ecosystems.
The development of these reservoir ecosystems and
their structural and functional characteristics largely
depend on morphometric parameters of reservoirs and
natural conditions of the region.
The Novosibirsk Reservoir on the Ob River was
constructed in 1957. The length of this seasonal stor
age reservoir is 200 km, surface area at the normal
maximum operating level is 1070 km
, and the average
depth is 9 m (Vasil’ev et al., 2000).
The zoobenthos of this reservoir was studied in
summer (2007–2009) in four areas: upper (the Kru
tikhinskoe Shoal upstream of Kamen’onOb, near
the village of Dresvyanka), middle (opposite the vil
lages of Spirino and Ordynskoe), lower (opposite the
villages of Borovoe and Leninskoe), and near the dam
(headwater and the mouth of Berdskii Bay), as well as
in Burmistrovskii, Karakanskii, and Berdskii Bays.
Bottom sediments were collected with a 0.025m
Petersen bottom sampler in the central part of the res
ervoir and with a 0.007m
Gr91 bottom sampler in
bays and shoals. Two samples were taken in each local
ity. In macrophyte beds, a special 0.096m
used. The samples were washed through nylon gauze
(mesh size 350
m), and invertebrates were collected and
preserved in 70% ethanol. A total of 93 samples of zoob
enthos and zooperiphyton were analyzed.
In the course of studies, 15 mollusk species were
found in the Novosibirsk Reservoir: seven species of
bivalves and eight species of gastropods. The most
abundant species were
the zooperiphyton (86% sample) and
(11% samples) and
L. (8% sam
ples) in the zoobenthos. On the whole, mollusks were
found in 30% of the total number of benthic samples,
with the lowest frequency of their occurrence (7%)
being recorded in areas of the Krutikhinskoe shoal that
dry up during the drawdown.
The lowest values of mollusk abundance and biom
ass (figure) were recorded in the macrozoobenthos
from the upper part of the reservoir, probably due to
the prevalence of mobile sandy substrates in this area.
In the middle part of the reservoir, mollusks were
found in 70% of benthic samples; the values of mollusk
abundance and biomass were the highest; the domi
nant species was
, whose biomass in
some localities reached 2970 g/m
. In the lower part of
the reservoir and in bays, small bivalves of the genera
were prevalent. The
occurrence frequency of mollusks in these areas was
relatively high (40% in the bays and 54% in the lower
part of the reservoir), but their abundance and biomass
were fairly low. No mollusks were found near the dam.
The highest values of mollusk abundance (1.4 ind./m
and biomass (5.8 g/m
) were recorded in beds of
In beds of
, mollusk biomass varied from 3.2 to
. The taxonomic composition of zooperiphy
ton showed no dependence on the plant species.
Three community types with mollusks as determi
nants can be currently distinguished in the reservoir:
Communities of macrophyte beds.
the greatest biomass are the gastropods
sp. The total abundance of inver
tebrates is high (on average, 4500
the taxonomic richness is the highest among all com
munity types (on average,
species per sample).
These communities have been formed in the bays of
Stages of Formation and Current State
of the Mollusk Fauna in the Novosibirsk Reservoir
L. V. Yanygina
Institute for Water and Ecological Problems, Siberian Branch, Russian Academy of Sciences,
ul. Molodezhnaya 1, Barnaul, 656038 Russia
Received November 11, 2009
: mollusks, spatial distribution, reservoir, water quality.