annual congres antipa museum 2011 bear skull

8/11/2019 Annual Congres Antipa Museum 2011 Bear Skull

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The Third Annual Zoological Congress of Grigore Antipa Museum Bucharest, Romania

23-25 November 2011

The analysis of the scores awarded to the

trophies of brown bear skulls in the South

Eastern part of the Eastern Carpathians

reflection on the wildlife management.

Ioan Mihai POP, Leonardo BERECZKY, Cosmin STNG, BERDE Lajos


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23-25 November 2011

Target specie

Ursus arctos , Linnaeus, 1758

Conservation status (RO) : vulnerableRomanian estimated population: approx. 6000

Hunted individuals: 250-350/year


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23-25 November 2011

Context of the study

High level of hunting quota in Covasna, Harghita and Vrancea county

Different ways of hunting bears (selective and nonselective)

304 shot bears during September 2007 until December 2010

304 scores for trophyLack of study regarding shot bears (304, meaning 5% of estimated bearpopulation at national level)

No impact study on how hunting activities are affecting the structure of bearpopulation

LIFEURSUS project - LIFE08/NAT/RO/000500


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23-25 November 2011

Study area

Study areacovering

approx. 10 %of the

estimatedbrown bearhabitat atnational

level

and approx.30% of the

estimatedbrown bearpopulation


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23-25 November 2011

Data collection

WHY THE SKULL?

Impossible to change the size of the trophy.

Recognized at international level by the International Hunting Committee as

the trophy indicates the size of a hunted individual.

Official reports of the game unit managers for each shot bears according to theRomanian law for derogation of the Habitat Directive

Data for 50 females and 254 males, different estimated age from 2 years to 28years


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23-25 November 2011

HOW THE SCORES ARE

CALCULATED?

TS=L+w


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23-25 November 2011

Results

Sex N Mean Std. Deviation Std. Error Mean

Age F 50 10.7000 5.13591 .72633

M 254 10.1378 4.69554 .29462

TS F 50 50.6460 3.82085 .54035

M 254 54.2885 5.32642 .33421

Estimated age and Trophy Score (TS)

killed bears

0

5

10

15

20

25

30

35

40

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

21.00

25.00

age

number

number


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23-25 November 2011

Mean

.0000

10.0000

20.0000

30.0000

40.0000

50.0000

60.0000

70.0000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

age

size

Mean

Female

Male

Results

Variables: SEX, AGE, Trophy Score (TS)

Mean

.0000

10.0000

20.0000

30.0000

40.0000

50.0000

60.0000

70.0000

2.00

3.00

4.00

5.00

6.00

7.00

8.00

9.00

10.00

11.00

12.00

13.00

14.00

15.00

16.00

17.00

18.00

20.00

21.00

22.00

25.00

28.00

age

size

Mean

Range 2-6 10.7478 cm

Range 6-28 9.6522 cm


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23-25 November 2011

Results

Month Mean Std.Deviation Range Skewness Variance Median

3.00 54.5895 4.10324 15.00 -.098 16.837 53.8000

4.00 54.7700 5.15088 26.40 -1.092 26.532 55.0000

5.00 54.6217 5.22963 24.00 -.608 27.349 54.0000

7.00 50.0000 . .00 . . 50.0000

9.00 53.4630 5.73660 20.20 .207 32.909 53.0000

10.00 52.7300 5.13088 28.90 -.474 26.326 52.9500

11.00 53.0533 6.11992 31.60 -.864 37.453 53.7000

12.00 54.7500 4.28283 16.40 -.766 18.343 55.5500

Total 53.6894 5.28008 32.00 -.637 27.879 54.0000

Mean

47.0000

48.0000

49.0000

50.0000

51.0000

52.0000

53.0000

54.0000

55.0000

56.0000

3.00 4.00 5.00 7.00 9.00 10.00 11.00 12.00

Month

TS

Mean

Mean of TS based on the hunting season

Bears shot in the spring season- 113

Bears shot in the autumn season- 190

Bears shot in the summer- 1

86% of the female were shot in autumn


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23-25 November 2011

Results

l/L variation

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45

Male l/L

Geometric aspect of the skulls for male

and females presented as l/L

For 46 males l/L=0.57

For 14 females l/L=0.58

Female l/L variaton

0.48

0.5

0.52

0.54

0.56

0.58

0.6

0.62

0.64

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Female l/L


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23-25 November 2011

Results

C

m

d

_T

n

o

M

a

a

a

t

d

u

u

C

m

C

u

u

u

G

g

h

u

u

H

g

h

t

a

In

o

u

N

m

r

a

V

a

Mean 54.5105 54.220 54.905 54.030 52.957 53.036 54.400 53.430 54.021 53.761 52.853 50.735 51.126

N 19 29 37 23 21 11 13 10 23 55 13 14 19

Std. Deviation 3.22437 5.05459 5.13879 5.55750 5.14942 3.23829 3.89957 6.38262 4.49979 5.02930 6.13455 9.06885 5.66812

Mean of TS on geographical units

Mean

48.0000

49.0000

50.0000

51.0000

52.0000

53.0000

54.0000

55.0000

56.0000

Coma

ndau

dl_Ta

rnave

lor

Mad

aras

Bara

olt

Bodo

c

Bret

cului

Calim

ani

Ciuc

ului

Gurg

hiului

Harg

hita

Into

rsurii

Nemi

ra

Vran

cei

Mean


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23-25 November 2011

Conclusions

The increase of the skull is higher in the first sixseven years of life

Female have a smaller skull than males (approx. 10% smaller) The increase of the skulls of male and females are similar in the first

years, than the skull of the males have a bigger increase

There are not significant differences between the geometric report

Width/Length in females and males skull Hunting has a selective character in the spring oriented towards bigindividuals (hunting at or near feeding points) and a random character

in the autumn (in relation to size and sex)

There are no significant differences between the skull size in differentgeographical areas

In relation to the TS there are differences between hunting management


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23-25 November 2011

Recommendations

Brown bear hunting should be a management tool for Romanian Brown

bear population, but as a management tool the random character shouldbe reduced

Hunting has to be oriented towards maintaining a normal structure ofthe population and not oriented towards trophy size (approx. 35% of the

killed individuals were adults, mature individuals over 10 years old)

Reducing the age of hunted individuals, protecting the adult and oldindividuals

Shot animals should be examined and measured to extract all the usefulinformation regarding brown bear biology and ecology

The age should be more precisely determined to improve the derogationreports to the EU


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23 25 November 2011

Thank you

www.carnivoremari.ro

www.canivoremari.ro/lifeursus/

www.biodiversitate.ro
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annual congres antipa museum 2011 bear skull

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