B. Papp szerk.: Studia Botanica Hungarica 37. 2006 (Budapest, 2006)

Dobolyi, Konstantin: Study of the population dynamics of Linum dolomiticum Borbás (Linaceae)

Table 1. Demographic data observed in the sample area. Symbol Formula

1 2001 2003 2005 Total number of the individuals I ló, = I

01-E

03

+N

03 1091 1()5 = -KBEo5+N

05 1040 1017 Number of the extinct individuals E 248 210 Number of the new individuals N [97 187 Change of the individual number AI AI(,3 = N

()1

—EQ3 = lőj—In: AI

(

,5 = N

os

—E()5 = I(>5 I()3 -51 -23 Ratio of the extinct individuals (%) e e

03 = (E

ü3

/Io

1

)*100 e

o5 = (E

(

,A.0*100 22.7 20.2 Ratio of the new individuals (%) n no

3 = (NoA.)*100 e

05 = (E

05

/Io

3

)*100 18.1 18.0 Ratio of change of the individual c C„3 = (AI

03

/I

01

)* 1 00 = «03-^03 -4.6 -2.2 number (%) C

05 = (AI

05

/I

O

3)* 100 = H„5-<?a, number (%) C

05 = (AI

05

/I

O

3)* 100 = H„5-<?a, 'The year of the data is indicated in index vidual number and position. Ratio of the new and extinct individuals and the change of individual number between 2003 and 2005 were calculated. The population of Linum dolomiticum is too large to simply count the individuals, so the size of the population was determined in the following way: 1 ) cover and number of the individuals were determined in the sample area; 2) total cover of Linum dolomiticum was estimated based on the distribution map of a scale of 1 to 200 (DOBOLYI 2001, 2004); 3) total individual number was calculated with the following formula: I = I

s

*C

p

/C

s

, where I = total individual number of the population; I

s = individual number of the sample area; C

p = total cover of Linum dolomiticum in the population; C„ = cover of the individuals in the sample area. Method of determination of the seed production: 1) fruits were counted in the sample area; 2) seeds were counted in circa 150 fruits and seed/fruit ratio (average number of seeds per fruit) was determined (one fruit can contain up to 10 seeds); 3) total seed production of the population was calculated with the following formula: S

p = s

i *F

S

*I/I

S

, where S

p = seed production of the population; s,

= seed/fruit ratio; F

s = number of fruits in the sample area; I and I, as above. Population dynamic parameters were calculated with formulas given in the Table 1. RESULTS AND DISCUSSION The most important result of this study is that we now have a determined size of the entire population of Linum dolomiticum. Total individual number of the full population is circa 42,000; exactness of the estimation: about 10%.