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Phytosociological Characterization of the Celtis Tournefortii Subsp. Aetnensis Mi- Crowoods in Sicily

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Phytosociological Characterization of the Celtis Tournefortii Subsp. Aetnensis Mi- Crowoods in Sicily Plant Sociology, Vol. 51, No. 2, December 2014, pp. 17-28 DOI 10.7338/pls2014512/02 Phytosociological characterization of the Celtis tournefortii subsp. aetnensis mi- crowoods in Sicily L. Gianguzzi1, D. Cusimano1, S. Romano2 1Department of Agricultural and Forest Sciences, University of Palermo, Via Archirafi 38 - I-90123 Palermo, Italy. 2Department of Earth and Marine Sciences, University of Palermo, Via Archirafi 22 - I-90123 Palermo, Italy. Abstract A work on the Celtis tournefortii subsp. aetnensis vegetation, endemic species located in disjointed sites in the Sicilian inland, is here presented. It forms microwoods with a relict character established on screes and detrital coverages, on a variety of lithological substrates (volcanics, limestones, quartzarenites). Based on the phytosociological analysis carried out in the territory, these vegetation aspects are framed in the alliance Oleo-Cerato- nion, within which a new association (Pistacio terebinthi-Celtidetum aetnensis) is described, in turn diversified in the following subassociations: a) typicum subass. nova, on detrital calcareous cones of the north-western part of Sicily, in the Palermo province (Rocca Busambra, Pizzo Castelluzzo and northern slopes of Pizzo Telegrafo); b) phlomidetosum fruticosae subass. nova, typical of carbonate megabreccias, on the most xeric sou- thern slopes of Pizzo Telegrafo (Caltabellotta territory, Agrigento province); c) artemisietosum arborescentis subass. nova, typical of quartza- renitic outcrops on the Nebrodi Mts. inland (Cesarò territory, Messina province); d) rhamnetosum alaterni subass. nova, widespread on cracked lava flows of the western side of Mount Etna (Catania province). Keywords: biodiversity, Celtis tournefortii Lam. subsp. aetnensis (Tornab.), Mediterranean vegetation, phytosociology, Pistacio-Rhamnetalia ala- terni, Sicily, syntaxonomy. Introduction (in Giardina et al., 2007) [= C. tournefortii var. aetnen- sis Tornab.; C. aetnensis (Tornab.) Strobl; included C. In the genus Celtis [fam. Celtidaceae (ex Ulmaceae- betulina Lojac. and Celtis asperrima Lojac.]. Celtidoideae; Elias, 1970; Ueda et al., 1997) or Can- The plant is a small tree, 4-6 (8) high, spring-flo- nabaceae (Sytsma et al., 2002; Whittemore, 2005)], wering and autumn-fruiting, tending to form xeric- Celtis tournefortii Lam. represents one of the three thermophilous communities, though it is a winter-de- species known for the European territory, together ciduous species; this habitus, in fact, is not common with C. australis L. and C. plachoniana K.I. Chr. (= C. among the Mediterranean woody species of xeric en- glabrata Steven ex Planch., not Sprengel). It is widely vironments, more typically represented by evergreen distributed along the southern margin of the Europe- sclerophyllous or summer-deciduous species. In Sicily an Region, however with quite sparse and fragmenta- the entity has a main subrange located on the volcanics ry stations, among Crimea, Iran and Anatolia, as well of the western part of Mt. Etna (Poli et al., 1974, 1981; as on the Crete Island, the Balkan Peninsula – as far Brullo & Marcenò, 1985; Brullo et al., 2009), with north as in Bulgaria (Zieliński et al., 2012), Macedonia other relict and disjointed nuclei distributed westward, (Micevski, 1993) and the coasts of Bosnia and Herze- on different lithological substrates. These latter sites govina (Jalas & Suominen, 1976) – up to Sicily (Jalas affect the inner side of the Nebrodi Mts. (Giardina, & Suominen, 1976; Tutin et al., 1964-80; Poli et al., 1990), the Sicilian hinterland south of the Madonie 1974, 1981; De Castro & Maugeri, 2006; Giardina et Mts. (Schicchi & Marino, 2011), the southern slope of al., 2007), where it reaches its extreme western limit Rocca Busambra (Lojacono Poiero, 1904; Troìa, 1997) and to which the present paper refers. and limited biotopes of the Sicani Mts., in particular Therefore, these populations have a particular phyto- Pizzo Castelluzzo (Troìa & Ilardi, 2002; Marino & Ca- geographical value and they are at the centre of ta- stellano, 2006), and the complex of Pizzo Telegrafo, at xonomic debates among various authors, tending in Contrada Cavallaro (Marcenò et al., 1995, 2002) and part to characterize one or more taxa endemic to the among the S. Biagio, Cava Grande, Inchiuse, Utine, island territory (Strobl, 1880; Lojacono Pojero, 1888- Cavallaro, Cannerie and Catusa districts (Gianguzzi et 1909; Raimondo & Schicchi, in Giardina et al., 2007). al., 2014), in the Sambuca di Sicilia (Palermo provin- On this basis – in the absence of precise comparative ce) and Caltabellotta territories (Agrigento province). studies with a morpho-anatomical and physiological Under the phytosociological aspect, Celtis tournefor- character – they are here referred to Celtis tournefortii tii subsp. aetnensis has been indicated so far as a more Lam. subsp. aetnensis (Tornab.) Raimondo & Schicchi or less gregarious element in the following commu- Corresponding author: Lorenzo Gianguzzi. Department of Agricultural and Forest Sciences, University of Palermo, Via Archirafi 38 - I-90123 Palermo, Italy, e-mail: [email protected] 18 L. Gianguzzi et al. nities ascribed to the class Quercetea ilicis, though to subsp. aetnensis in Sicily (Fig. 1) was realized on the different orders: a) Quercus ilex woods in the Etna area basis of unpublished data collected during the present [Celtido-Quercetum ilicis n.n. (sub C. aetnensis) (Poli survey, in addition to references reported in the biblio- et al., 1973, 1981)]; b) Quercus virgiliana woods in the graphy for Etna (Poli et al., 1974, 1981; Brullo & Mar- western side of Mt. Etna [Celtido aetnensis-Quercetum cenò, 1985; Brullo et al., 2009), Nebrodi Mts. (Giar- virgilianae Brullo & Marcenò, 1985 (sub C. aetnensis) dina, 1990), Gangi at Portella d’Argento and Cozzo (Brullo et al., 2009)]; c) Euphorbia dendroides maquis Ficilino (Schicchi & Marino, 2011), Rocca Busambra at Caltabellotta, in the Agrigento province [Oleo-Eu- (Lojacono Poiero, 1904; Troìa, 1997), Pizzo Castelluz- phorbietum dendroidis Trinajstić (1973) 1984 subass. zo (Troìa & Ilardi, 2002; Marino et al., 2005; Marino celtidetosum tournefortii Marcenò et al. 2002 (sub C. & Castellano, 2006) and Caltabellotta (Marcenò et al., tournefortii) (Marcenò et al., 1995, 2002)]. 1995, 2002). The present work takes the cue from a recent finding of some vegetation nuclei dominated by the species Description of the study area located on Pizzo Telegrafo, in the southern part of the For the ecological framework of the sites, several bi- Sicani Mts. (Gianguzzi et al., 2014), where the species bliographical contributions of geolithological (Mascle, constitute interesting microwoods with a relict charac- 1974; Di Stefano & Vitale, 1992; Romano, 1999; Len- ter, belonging to a pioneer vegetation series typical of tini et al., 2000) and bioclimatic nature (Gianguzzi, screes of carbonate nature. The paper deals with the 1999; Gianguzzi et al., 2000, 2002; Gianguzzi & La phytosociological role of the species in the various Mantia, 2004; Drago, 2005) were consulted. vegetation aspects located in Sicily, considering that The distribution of Celtis tournefortii subsp. aetnen- the aforecited coenoses had been in turn ascribed to sis in Sicily was localized in six separate sites (Fig. distinct orders of the class Quercetea ilicis. 1) – each of them with one or more stations –, whose main stational characteristics, summarized in Tab. 1, Materials and Methods are reported below. The research started in 2008, after the finding of 1) Carbonate complex of Pizzo Telegrafo (Bisacquino- some microwoody nuclei of the species pinpointed in Caltabellotta). the southern part of the Sicani Mts., then extending the These microwoody nuclei – many of them previou- survey to the other known stations in Sicily. sly unpublished and located on two separate sides of Pizzo Telegrafo (952 m a.s.l.) – cover a total area of Taxonomical and chorological analysis well over 50 hectares. The species is spread out well For the determination of the species listed in the text, beyond the biotope of Contrada Cavallaro already re- reference was made to the floras of Pignatti (1982) and ported by Marcenò et al. (1995), and whose population Fiori (1923-29). The taxonomical nomenclature main- was estimated to be only 300 individuals (Schicchi & ly follows Giardina et al. (2007) and Tutin et al. (1964- Marino, 2011). In the northern slopes they are found 1980, 1993), except for C. aetnensis (Tornab.) Strobl., on the various screes that characterize the area, at al- which refers to De Castro & Maugeri (2006). The ex- titudes between 380 m and 785 m a.s.l. A further po- siccata collected during the field research are kept at pulation is found along the southern slopes, affecting a the Department of Agricultural and Forest Sciences of very expansive area. These latter nuclei establish both the University of Palermo. on screes and on debris coverages in karst depressions, The general distribution map of Celtis tournefortii between 480 m and 782 m a.s.l. Under the geolitholo- Tab. 1 - Characteristics of the surveyed sites, with mean altitude, exposure, lithological substrata and bioclimate. Locality (municipality, administrative province) Altitude (m) Exposure Substrate Bioclimate Calcareous Upper mesomediterranean 1) Pizzo Telegrafo (Palermo and Agrigento provinces) 380-790 various megabreccias and marly debris lower subhumid Upper mesomediterranean 2) Pizzo Castelluzzo (S. Stefano Quisquina, Palermo) 810-960 W/SW Limestone lower subhumid
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