Rila Monastery Nature Park Management Plan - part - usaid

February 2004
alpine zone. The largest numbers of rare taxa of arachnids have been established in
the areas of the Radovichka River (11), the Iliyna River (9), at the Tiha Rila and
Ribni Lakes (5 each); the most numerous rare taxa of Coleoptera insects have been
found along the Rivers Iliyna (6) and Tiha Rila (4) and at Kalin Dam (3).
In none of the other groups does the proportion of rare (stenotopic) taxa exceed 10%;
yet in every group there are characteristic species that are bound to specific habitats in
the mountain.
Endemics - A total of 85 endemic species have been identified in the Park. They are
very different in origin and constitute a heterogeneous group. The majority of those
(42) are endemic to the Balkans, followed by Bulgarian (2) endemics;. The largest
numbers of endemic species per location have been established in the Iliyna River
Valley (25), followed by the Kalin area (13) and the Rila Monastery Forest Reserve
and Tiha Rila (10 each). The distribution of endemics by groups is shown in Fig. 16
below.
The largest number of endemic species have been identified amid insects: 64 (75.3%
of all endemic species). Of these, 33 are Bulgarian, and 31, Balkan endemics. For
some of the smaller groups the percentage of endemic species is rather high (for
Myriapoda, 16.2%; Arachnida, 14.3%); while in Mollusca it is 8.6%. Out of 17
endemic species of Myriapoda, 11 are Balkan endemics, while out of 15 endemic
arachnids five are Bulgarian, five Balkan, two endemic to the Balkan-Asia Minor area
and one is Carpatho-Balkan.
The largest number of endemic invertebrates has been found in Rila Monastery Forest
Reserve (31), along the valley of the Iliyna River (29), in the Kalin area (20) and along
the River Radovichka (16). The mixed-forest, sub-alpine and alpine zones are the
richest in endemic taxa.
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30
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Mollusca Arachnida Myriapoda Insecta
Fig. 16. Endemic invertebrates in Rila Monastery Nature Park (bars in front
show percentage of all species in the respective class represented in the Park)
The percentage of endemic invertebrate taxa is significant (4.2%), making the
territory of Rila Monastery Nature Park a major species-generating source.
Rila Monastery Nature Park
Management Plan -Draft
2004 - 2013
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