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ŠUMARSKI LIST 7-8/2011 str. 22     <-- 22 -->        PDF

I. Mihoci & M. Franjević: RAREAND THREATENED GEOMETRID MOTH Erannis ankeraria IN CROATIA: ... Šumarski list br. 7–8, CXXXV (2011), 353-360

prominent, and stereochemicals of genus Erannis are
known (not exclusivelyforE. ankerariaalthough mixture
of identified stereochemical components for the
genus can be used) (Hansson etal. 1990,Szöcs et
al. 1993, Goller et al. 2007). Therefore, pheromone
traps should be used in attracting males in their habitats.

Potential sites on which anAngoran Umber could be
found correspond with xerotermophilic sun-Mediterranean
oak forest (degraded) habitats (Čelik et al.
2004,Flamigni etal. 2007,Leraut 2009,Barčić
et al. 2011, Baričević & Šapić 2011). In xerotermophilic
environments these are represented with six
vegetation communities (Vukelić etal. 2008):

(1)mixed forest of Sessile Oak and Sweet Chestnut (As.
Querco-Castanetum sativae Horvat 1938) that occurs
in the Kvarner region above Kastav and Učka.

(2)forest of Sessile Oak withAutumn Moore grass (As.
Seslerio autumnalis-Quercetum petraeae Poldini/
1964/1982) which ispresent on a single locality
in Croatia, in Dragonja (Istria).

(3)thermophilic forest of Pubescent Oak with Tall
Moor grass (As. Molinio-Quercetum pubescentis
Šugar 1981) whichgrows in the flysch part of Istria
near Motovunski Novaki and represents part of a
larger complex of Pubescent Oak stands in which
Sessile Oak andTurkey Oakdominate.

(4)thermophilic and weakly acidophilic forest of Pubescent
Oak withWhite Cinquefoil(As.Potentillo
albae-Quercetum pubescentis A.O. Horvat 1973)
which has only been identified in the locality Bregi
in the flysch part of Istria (Vukelić etal., 2008).
The tree layer is dominated by Pubescent Oak,
Turkey Oak and Hop Hornbeam.

(5)forest and scrub of Pubescent Oak and Oriental
Hornbeam (As.Querco-Carpinetum orientalisHorvatić
1939) in the sub-Mediterranean zone of the littoral
belt from Istria to Dubrovnik.

(6)mixed forest and scrubs of Pubescent Oak and Hop
Hornbeam (As. Ostryo-Quercetum pubescentis
/Horvat 1950/Trinajstić 1979) in the northern Adriatic
(northern Istria, the littoral slopes of Velebit,
and the northern slopes of Bukovica).

After surveying potential habitats and defining current
distribution of species, obtained results could help
in proposing several forest management guidelines.
Proposal should focus on maintaining structure and
function of theAngoran Umber habitat – light Pubescent
Oak and Sessile Oakforests and forest edges,in
order to fulfill ecological requirementsand survival of
the species.As Lepidoptera are in general habitat-dependent,
forest management should consider providing
good stability and condition of forests and best protection
and conservation of specific microhabitats for this
threatened moth.

Figure 2
Erannis ankeraria and morphologically similar winter
moths Agriopis marginaria (Fabricius, 1776)(a), A. aurantiaria
(Hübner, 1799)(b) and A. defoliaria (Clerck,

Slika 2. Erannis ankeraria i morfološki slični mrazovci Agriopis
marginaria (Fabricius, 1776)(a), A. aurantiaria(Hübner,
1799)(b) iA. defoliaria(Clerck, 1759)(c)
(Photo –Foto: David Mihoci according to Leraut (2009)