Fig. 25.5. Dendrogram derived from the
similarity
in seasonal
pattern of
bird density fluctuation in several habitat
types. Four
groups are identified in the
dendrogram
(vertical lines).
The four graphics on the left
show the average profile
of
density variation for each
group, in which
monthly densities have been
transformed to
a percentage
relative to maximum density
attained. References(between
parentheses)
and localities
used to construct figure: PI
plot I, present
study;
P2 plot 2,
l--· .. .. ~-o 1\
2O~ ~ J JI A S 0
OJ
FMAMy
---.
Type of
Habitat
Holm oaks (2)
Holm oaks (P I )
Steppe (3)
Holm oaks (J)
""I
Holm ,"", (P2)
80
Pines (4)
.,
~~
Holm oaks (II)
40
-
\
Pyrenean oaks (5)
20
'e
I Pines (6)
Mixed Forest (7)
o J
F M
A My
J JI
A
SON 0 . -
Mixed Forest (8)
100
80
80
40
20
~
[
Holm oaks (10)
Holm oaks (12)
¥ Mixed Forest (9)
. Farmland (J
4)
Shrublands (13)
Pines (16)
ASONDI I
'
A My
J JI
o ,
, .
I
l ~o
Pines (17)
Cereal (I
5)
Steppe (18)
o J
F M
Correlation coefficient
1
0.7
0 . 4
0.1
-0.2
- 0 . 5
+---------+---------+---------+---------+---------+
present study; I Le6n (Garnica 1988); 2 Madrid (Carrascal et
aI. 1987); 3 Belchite, Zaragoza (Suarez and Saez-Royuela 1985); 4 Madrid (Carrascal et
aL 1987); 5 Sierra Nevada, Granada (Zamora and Camacho 1984b); 6 Cazorla, Jaen (Obeso 1987); 7 Cazorla, Jaen (Obeso 1987); 8 Navarra (Purroy 1975a); 9 C6rdoba (Torres and Le6n 1985); 10
plot A, Hueiva (Herrera 1980); II Sierra Nevada, Granada (Zamora and Camacho 1984a); 12 plot B, Huelva (Herrera 1980); 13 Sevilla (Jordano 1985); 14 Vizcaya (Galarza
1987); IS Cuenca (Potti and Garrido 1986); 16 Doiiana, Hueiva (Costa 1984); 17 Doiiana, Hueiva (Costa 1984); 18 Alcaiiiz, Teruel (Suarez and Saez-RoYl.lela 1985).
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