DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 7-8/2011 str. 20 <-- 20 --> PDF |
I. Mihoci & M. Franjević: RAREAND THREATENED GEOMETRID MOTH Erannis ankeraria IN CROATIA: ... Šumarski list br. 7–8, CXXXV (2011), 353-360 Bulgaria and Romania(Čelik etal. 2004,Flamigni et al. 2007, Leraut 2009).Itis single brooded with adults emerging at the end of February and being active into beginning ofApril,when the air temperatures are favorable (Čelik etal. 2004,Flamigni etal. 2007, Leraut 2009, Beshkov & Zlatkov 2011).They belong to so-called ecological group of “winter” moths.The ‘‘winter moth syndrome” is a set of ecologicaltraits which refers tothe adult flight season either very early of verylate in the season;winter mothsprefer forest habitats, spring-feeding and/or larval polyphagy and have limited or no adultfeeding at all (Wahlbergetal. 2010). Malesof theAngoran Umber have a wingspan of 32 to 40 mm with forewings light beige in color and transverse light brown lines often weakly visible (Leraut 2009). Males are strongly attracted to lights and can often be found flying around lamps or light UV-traps. An adult male is morphologically close to the most significant oak defoliators (Glavendekić 2010)Agriopis marginaria (Fabricius, 1776), Agriopis aurantiaria (Hübner, 1799) and Erannis defoliaria (Clerck, 1759) (Table 1, Fig. 2). According to Beshkov &Zlatkov (2011)the structure of antennae in males is the most reliable morphological feature of separation between mentioned taxa. They are slightly bipectinate with short lamellae forming tufts of hair, not a pecten in E. ankeraria and in other three species male antennae form two-times longerpecten. Although,ErannisandAgriopisare not closely related, the highly similar appearance of these moths (formerly considered congeneric based on similar structure of male antennae) indicates convergent evolution (thus, wing morphology enabling active flight at low temperatures, and mimicking yellow autumn leaves)(Wahlberg at al. 2010). By the structure of male genitalia Leraut (2009) and Beshkov & Zlatkov (2011) placeE. ankerariainto the genusDesertobiaViidalep, 1979 and A. marginaria and A. aurantiaria into the genusPhigaliohyberniaInoue, 1942. The female is brownish, from 9 up to 15 mm in length(Čelik etal. 2004,Leraut 2009) and suffers from a wing reduction(is it brachypterous) so therefore flightless. She emits sex pheromones that often attract males. Females are usually found at the base of trees or crawling up the tree trunks. Caterpillars feed on leaves on both Pubescent Oak (Quercus pubescens(von Willdenow,1796)and the Sessile Oak (Quercus petraea ((Mattuschka) Liebl., 1784) and inhabit sub-Mediterranean xerothermophilous oak shrub forests, light open oak forests and oak groves in sub-Mediterranean environments from plain up to 600 m a.s.l (Leraut 2009).TheAngoran Umber hibernates in the pupal stage (Čelik etal. 2004). Although, theAngoran Umber is strictly protected in Croatia, the conservation status assessment-regarding current range,population size and trend, detailed habitat features and future prospects is inadequate and insufficient,precisely unknown. Purpose of this paper is to pronounce a lack in knowledge in distribution and population dynamics of this endangered moth, to initiate systematic research forgathering data needed to access species conservation status; and to accent the need in active involvement of foresters in future long-term monitoring. MATERIALAND METHODS – Materijal i metode In order to access species occurrence and distributionin Croatia we analyzedrecords from published papers, data from collections of Croatian and Slovenian museums and faculties and unpublished recent field data.Re-examined material is deposited in the Central moth collection of Croatian Natural History Museum – sub collection of the Geometridaefamily (G CNHM), in the Igalffys’ entomological collection of CNHM (I CNHM), Kučinićs’collection(K CNHM) andVaj dićs’ collection (VCNHM) of Lepidoptera of CNHM, in themoth collection of the Natural History Museum in Rijeka (NHMR), collection of butterflies and moths of Radovan Kranjčev from the Koprivnica city museum (RKM), Koščecs’entomological collection from theVaraždin city museum (KVCM), Hafners’collection of Lepidopteraof the Slovenian Museum of Natural History (H SMNH) and Badovinac (BFF) and Henchentomological collection (HFF) at the Faculty of Forestry, University of Zagreb, Croatia.Abbreviations are used further in the text when referring to collections. Specimens were identified by the wing morphology according to Flamigni et al. (2007) and Leraut(2009). Field data was gathered during the field trips in Istria, on the Ćićarija Mt., Učka Mt. and coastal side of theVelebit Mt.in one night per week fieldtrips during February and March 2009, with insufficient catch per unit effort, referring to the limited number of only four light traps per site.Adultmale moths were accessible tostandardized sampling method by attractable light UV-trapsOsram Blacklight L18W/73 – 600 mmwith a white reflectable fabric on the pyramidal metal construction. Aconstruction has a base length of two meters and operates at a ground level.Light trap was on from dusk till early morning, not less than 5 hours. Given that females of the species are brachypterous and therefore do not fly, we visually inspected oak trees during daytime. |