Ecological-GENETICal VARIABILITY of the ISOLATED POPULATIONS of SCOTS
PINE ON SOUTHERN bounders of natural habitat Areal
I.V.Tikhonova
V.N. Sukachev
Institute of Forest SB RAS,
The date of paleobotanical researches of Holocene peat depositions and
more ancient layers show that
an area border of Scots pine have noticeably varied during different climatic
epochs (Pyavchenko, 1965; Savin,
1982; Koschkarova, 1986, 2002). The periods of
essential displacement of climatic zones (up to 1-3 thousand km) when
vegetative cover was exposed almost to full extermination and revived for
the expansion of plants from the south were founded (Koschkarova,
2001). In this relation geographical and ecological isolated populations on the
south of
The purpose of the
present research was the studying of ecologo-genetic polymorphism of some isolated populations of
a pine in the south of Middle Siberia: schirinsky (Khakasia), minusinsky (the south
of
S.A.Mamaev's (1973) O.A.Filipchenko’s
(1978) approaches and examples of using of multivariate methods of the analysis
in population biology (V.M.Schmidt (1984), P.V.Terentyev and N.S.Rostovoj
(1977), and (Jivotovsky, 1991; Schemberg,
1986; Menitsky, 1971, etc.) were served as methodical
basis. Own original approaches to application of combinations of traditional
analysis methods are
offered to obtain additional information on character of the treats integrated
variability and adaptive potential of populations. To estimate sensitivity and norm of reaction of
trees tree-rings chronologies and dendro-chronological
methods of the analysis were used. The results of investigation of pine artificial
plantations in Shirinsky steppe were involved to
support thesis about importance of natural populations biodiversity protection
as major factor of their sustainability.
The main results of
ten years observation are:
1. The data of the
comparative analysis of population phenotypic structure. The high phenotypic
diversity and increasing of growth correlations of dwarfish pines were found
and also structurally functional unity of populations which are not broken by
inclusion to the analysis of undersized individuals was noted. It was established
a connection of phenotypic diversity with a state of artificial plantations in Sirinsky steppe.
2. The spectrum of
morphological forms of
pine trees on the basis of an estimation of treats integrated
variability was revealed.
3.
Individual variability of sensitivity and adaptive norm of reaction of pine populations
was estimated. The correlation of tree sensitivity to climate changes with a
sex is appreciated. Dynamics of sexual structure of populations and its
reaction on climatic factors was shown.
* The work was partially supported by RFBR
and KKSF ¹
07-04-96808