ISSN 1063-0740, Russian Journal of Marine Biology, 2009, Vol. 35, No. 2, pp. 132–137. © Pleiades Publishing, Ltd., 2009.
Original Russian Text © S.V. Malavenda, G.M. Voskoboinikov, 2009, published in Biologiya Morya.
The brown alga
Linnaeus is a
perennial macrophyte widely distributed in intertidal
and upper subtidal areas of the Barents and White seas
and Northern Atlantic .
can be consid-
ered as a unique species due to its eurybionty . This
species inhabits both open coasts, under conditions of
the greatest intensity of water movement (IWM) and
bays, under reduced IWM and different degrees of
desalination . It was found in experiments that
IWM affects the rate of metabolite uptake into the thal-
lus and, indirectly, the intensity of metabolism [14, 15].
The salinity determines the intensity of water input into
algal cells and provides a normal osmotic pressure .
Most studies dealing with the mechanisms of tolerance
of fucoids to external effects discussed the responses of
certain organisms or cell groups to changes in different
The goal of this project was to search for possible
correlations between the population structure of
and abiotic factors. The experiments per-
formed earlier revealed some peculiarities of the popu-
lation structure in
; however, if was not
possible yet to isolate particular effects of IWM, salin-
ity, and substrate pattern [7, 12, 13].
MATERIAL AND METHODS
Altogether ten sampling stations were set in the
intertidal zone of two inlets in Eastern Murman area,
and in the bay located between them, in the areas inhab-
(Fig. 1). The samples of the
algae were collected from the middle intertidal horizon
Influence of Abiotic Factors on the Structure of the Population
of the Brown Alga
in East Murman (Barents Sea)
S. V. Malavenda and G. M. Voskoboinikov
Murmansk Marine Biological Institute, Kola Science Center, Russian Academy of Sciences, Murmansk, 183010 Russia
Accepted September 13, 2007
—The peculiarities of the structure of the population of the brown alga
in East Mur-
man at different combinations of abiotic factors were studied. Salinity below 10‰ and high surf activity
reduced the average life span of the plants (to 1 year) and caused a signiﬁcant predominance of female speci-
mens (60–90% of the fertile specimens). The proportion of female specimens increased with age. The greatest
average age (3 branchings) and the highest survival of
occurred in the wave-protected parts of
bays. The distribution of
was related to water movement intensity, salinity, and substrate type.
The size–weight characteristics of
thalli were decreased during maximum salinity ﬂuctuations.
The optimal conditions for this species were those existing on a weakly protected shore with short-term ﬂuctu-
ations of salinity (24
Linnaeus, population structure, salinity, water movement, substrate type, adap-
Schematized map of the surveyed area. 1, Priboinaya
Bay; 2, Probnyi Cape; 3, Krasnaya Skala; 4, The small harbor;
5, Oskara Bay; 6, Bobrovaya Bay; 7, Dal’nii Plyazh Beach;
8, Innermost part of Yarnyshnaya Guba Bay; 9, Inner basin of
Yarnyshnaya Guba Bay.