A New Endemic Plant Community with Schoenus Nigricans in the Southeastern Alps and Northern Dinaric Alps Nova Endemična Združb
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A NEW ENDEMIC PLANT COMMUNITY WITH SCHOENUS NIGRICANS IN THE SOUTHEASTERN ALPS AND NORTHERN DINARIC ALPS NOVA ENDEMIČNA ZDRUŽBA Z VRSTO SCHOENUS NIGRICANS V JUGOVZHODNIH ALPAH IN SEVERNEM DELU DINARSKEGA G OR ST VA Igor DAKSKOBLER1 & Andrej MARTINČIČ2 http://dx.doi.org/10.3986/fbg0037 ABSTRACT IZVLEČEK A new endemic plant community with Schoenus nigricans Nova endemična združba z vrsto Schoenus nigricans v Ju- in the Southeastern Alps and northern Dinaric Alps govzhodnih Alpah in severnem delu Dinarskega gorstva We studied the phytosociology of plant communities Fitocenološko smo preučili rastlinske združbe zahodne with Schoenus nigricans, a character species of the alliance Slovenije, v katerih uspeva vrsta Schoenus nigricans, Caricion davallianae, in western Slovenia. Most of our rele- značilnica zveze Caricion davallianae. Večino naših popisov vés are classified into the new association Astrantio carnioli- uvrščamo v novo asociacijo Astrantio carniolicae-Schoene- cae-Schoenetum nigricantis, whose stands grow on moist tum nigricantis, katere sestoji poraščajo vlažno skalovje in rocks and in the headwater section of springs and small povirja studencev in majhnih potokov v dolomitnih gozd- brooks in dolomite wooded areas, especially in the Cerkno natih območjih predvsem na Cerkljanskem, v povodju Idri- region, in the basin of the Idrijca river. Its character species jce. Njene značilnice in (geografske) razlikovalnice so vrste and (geographical) differential species are Schoenus nigri- Schoenus nigricans, Molinia arundinacea, Astrantia carnioli- cans, Molinia arundinacea, Astrantia carniolica, Palustriella ca, Palustriella commutata, Carex flacca, Valeriana saxatilis, commutata, Carex flacca, Valeriana saxatilis, Salix glabra, Salix glabra, Erica carnea in Primula carniolica. Poleg tipične Erica carnea and Primula carniolica. In addition to the typi- oblike (subasociacija -typicum) smo opisali tudi subasociaci- cal form (subassociation -typicum) we described also the jo s prevladujočo vrsto Cladium mariscus (-cladietosum subassociation with predominating Cladium mariscus (-cla- marisci). Preučena dolomitna povirja sodijo med varstveno dietosum marisci). The studied dolomite headwaters are a pomembne habitatne tipe v evropskem merilu (Natura Natura 2000 habitat type and the sites of several vulnerable 2000). So rastišča z več ranljivimi in zavarovanimi vrstami, and protected species. Their role as a biotope is therefore zato imajo velik biotopski pomen in potrebujejo ustrezno significant and requires adequate protection. varovanje. Key words: phytosociology, synsystematics, dolomite Ključne besede: fitocenologija, sinsistematika, dolomit- springs, Schoenus nigricans, Cladium mariscus, Primula car- no povirje, Schoenus nigricans, Cladium mariscus, Primula niolica, Caricion davallianae, Natura 2000, Slovenia carniolica, Caricion davallianae, Natura 2000, Slovenija 1 Institute of Biology, Scientific Research Centre of the Slovenian Academy of Sciences and Arts, Regional Unit Tolmin, Brunov drevored 13, SI-5220 Tolmin, [email protected] 2 Zaloška 78 a, SI-1000 Ljubljana, [email protected] FOLIA BIOLOGICA ET GEOLOGICA 59/1, 5–28, LJUBLJANA 2018 IGOR DAKSKOBLER & ANDREJ MARTINČIČ: A NEW ENDEMIC PLANT COMMUNITY WITH SCHOENUS NIGRICANS 1 INTRODUCTION Schoenus nigricans is a subcosmopolitan species, a mariscus. The stands with the latter species were al- character species of small-sedge rich-fen vegetation of ready described in more detail in previous article calcareous oligotrophic flushes, soligenous mires and (Dakskobler 2011: 5–6, 19–21) and we also published dune slacks in lower altitudes from the alliance Cari- a phytosociological table with four relevés of the provi- cion davallianae (Aeschimann et al. 2004: 778, Mar- sional syntaxon Astrantio carniolicae-Schoenetum nig- tinčič 2007: 803, Šilc & Čarni 2012: 128). Its distribu- ricantis cladietosum marisci prov. (see also Šilc & tion and sites in Slovenia have been described in detail Čarni 2012: 128). As we have collected more new rel- in several articles (Martinčič 1991, 1995, Kocjan et evés since then, mainly in the gorges and ravines of the al. 2013). While mapping the flora of the Soča Valley Cerkno region, we made a phytosociological table that and studying the sites and communities of the endem- allows us to compare the community with Schoenus ic Primula carniolica we came across, mainly in wood- nigricans from this area with previously described ed areas, fascinating, small-area dolomite headwaters communities elsewhere in Slovenia (Martinčič, ibid., that were usually dominated by Schoenus nigricans and Accetto 2001) and provide a more thorough synsys- Molinia arundinacea, very rarely also by Cladium tematic classification for this community. 2 METHODS Communities with Schoenus nigricans were studied Schrank and Sesleria caerulea (L.) Ard. (instead of S. applying the Braun-Blanquet method (Braun- caerulea subsp. calcaria). Ros et al. (2007) is the no- -Blanquet 1964). A total of 75 relevés (of which five menclature source for the names of liverworts (Mar- had already been published: one in Dakskobler 2005, canthiophyta) and Ros et al. (2013) for the names of relevé 8 in Table 1, and four in Dakskobler 2011: 19– mosses. Šilc & Čarni (2012) are the nomenclature 21) were entered into the FloVegSi database (Fauna, source for the names of the syntaxa, except for the Flora, Vegetation and Paleovegetation of Slovenia) of name of the class Querco-Fagetea Braun-Blanquet et the Jovan Hadži Institute of Biology at ZRC SAZU (T. Vlieger in Vlieger 1937. Seliškar, Vreš et A. Seliškar 2003). They were ar- Most of the relevés discussed in this article were ranged into a working table based on hierarchical clas- made in the Cerkno and Idrija Hills at the contact of sification. We transformed the combined cover-abun- the pre-Alpine and Dinaric phytogeographical regions dance values with numerical values (1–9) according to of Slovenia (Figure 3). The geological bedrock in the van der Maarel (1979). Numerical comparisons were study area is mainly dolomite (Buser 2009). The stud- performed with the SYN-TAX 2000 program package ied communities occur in the submontane belt (from (Podani 2001). The relevés were compared by means 200 to 570 m a. s. l.) on initial soils (lithosols, rendzina of “(unweighted) average linkage method” – UPGMA, or very shallow molic gleysols) – Vidic et al. (2015). The using Wishart’s similarity ratio. regional climate is moderately warm and humid, with The nomenclature source for the names of vascu- mean annual precipitation of 2,000 to 2,500 mm (Zu- lar plants is the Mala flora Slovenije (Martinčič et al. pančič 1998) and mean annual air temperature of 6 ºC 2007), except for the names Molinia arundinacea to 8 ºC (Cegnar 1998), but the local climate is colder. 3. RESULTS AND DISCUSSION 3.1 Review of the studied syntaxa, with types of Schoenetum nigricantis W. Koch 1926 newly described communities Astrantio carniolicae-Schoenetum nigricantis ass. nov. hoc. loco, the nomenclature type, holotypus, Scheuchzerio palustris-Caricetea nigrae Tx. 1937 nom. mut. is relevé 23 in Table 1. Caricetalia davalliane Br.-Bl. 1949 -typicum, subass. nov., the nomenclature type Caricion davallianae Klika 1934 is the same as the nomenclature type of the Caricetum davallianae Dutoit 1924 association 6 FOLIA BIOLOGICA ET GEOLOGICA 59/1 – 2018 IGOR DAKSKOBLER & ANDREJ MARTINČIČ: A NEW ENDEMIC PLANT COMMUNITY WITH SCHOENUS NIGRICANS -cladietosum marisci subass. nov., the nomen- 3.2. Description of the new plant community clature type, holotypus, is relevé 57 in Table 1. with Schoenus nigricans in western Slovenia Asplenietea trichomanis (Br.-Bl. in Meier et Br.-Bl. 1934) Oberd. 1977 In the first step we exported all our relevés with Schoe- Potentilletalia caulescentis Br.-Bl. in Br.-Bl. et Jenny nus nigricans from the FloVegSi database. We obtained 1926 a total of 78 relevés, of which three were made in forest Physoplexido comosae-Saxifragion petraeae Mu- communities, two in the stands of the association Gen- cina et Theurillat 2015 (sin. Phyteumato-Saxifra- isto januensis-Pinetum sylvestris Tomažič 1940 and one gion petraeae Mucina in Šilc et Čarni 2012) in the stand of the association Rhododendro hirsuti- Primuletum carniolicae Accetto 2008 Ostryetum Franz ex Dakskobler 2015. These three Pinguiculetum alpinae nom. prov. stands, where the studied species occurred only with Elyno-Seslerietea Br.-Bl. 1948 the rating +, were excluded from further study on ac- Seslerietalia coeruleae Br.-Bl. in Br.-Bl. et Jenny count of their distinctly different character. The re- 1926 maining 75 relevés were compared through hierarchi- Caricion austroalpinae Sutter 1962 cal classification. The result was the dendrogram in Primulo carniolicae-Seslerietum calcariae Daks- Figure 1. kobler 2006 Figure 1: Dendrogram of relevés with Schoenus nigricans in western and northwestern Slovenia, UPGMA, 1-similarity ratio: AS – Astrantio carniolicae-Schoenetum nigricantis typicum, ASc – Astrantio carniolicae-Schoenetum nigricantis cladietosum marisci, ASs – Astrantio carniolicae-Schoenetum nigricantis var. Sesleria caerulea, PS – Primulo carniolicae-Seslerietum calcariae, PC– Primuletum carniolicae, SN – Schoenetum nigricantis, CD – Caricetum davallianae Slika 1: Dendrogram popisov sestojev z vrsto Schoenus nigricans v zahodni in sevorozahodni Sloveniji, UPGMA, 1-similarity ratio: AS – Astrantio carniolicae-Schoenetum nigricantis typicum, ASc – Astrantio carniolicae-Schoenetum nigricantis cladi- etosum