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Download Article (PDF) Biologia 67/6: 1175—1185, 2012 Section Zoology DOI: 10.2478/s11756-012-0109-7 How life history affects threat status: Requirements of two Onobrychis-feeding lycaenid butterflies, Polyommatus damon and Polyommatus thersites, in the Czech Republic Jana Šlancarová1,2,BarboraBednářová3,JiříBeneš2 &MartinKonvička1,2 1Department of Zoology, University of South Bohemia, CZ-37005 České Budějovice, Czech Republic; e-mail: [email protected] 2Biology Centre, ASCR, v. v. i., Institute of Entomology, CZ-37005 České Budějovice, Czech Republic 3Department of Biology and Ecology, University of Ostrava, CZ-71000 Ostrava, Czech Republic Abstract: Comparisons of related species differing in conservation status may offer insights into causes of species declines. We studied egg-laying patterns and landscape occupancy of two sympatric lycaenidae butterflies inhabiting xeric grasslands, vulnerable Polyommatus thersites and critically endangered Polyommatus [Agrodiaetus] damon, both developing on sainfoin, Onobrychis spp. Females of bivoltine P. thersites oviposit on host plant leaves at a relatively low height (≈20 cm), in both spring (May–June) and summer (July–August) generations. Females of univoltine P. damon (July–September) oviposit to senescing inflorescences, in significantly higher heights (>30 cm), and the species is hence vulnerable to summer mowing or grazing. On a landscape scale, both species tended to occur at sites with diverse sward management, including temporarily unmanaged patches. In addition, P. damon occurred only in the proximity of other occupied sites. The study documents that grassland management must respect the needs of the most vulnerable species, and because these needs are seldom known, it must maintain a high diversity of conditions within individual sites. Key words: butterfly conservation; farmland landscape; grazing; habitat management; insect life history; Lepidoptera; metapopulation; xeric grassland Introduction that fragmented remnants of xeric grasslands, often protected as reserves, are insufficient to support the Profound land use changes such as agriculture and regional diversity of xerophilous species (Kadlec et al. forestry intensification, urbanisation and abandonment 2008; Sang et al. 2010; Wenzel et al. 2006). of marginal lands, has resulted into biodiversity loss Not all xeric grassland butterflies are affected at across Europe during the last decades (Donald et al. the same rate. The fate of particular species depends 2001; Kleijn et al. 2009; Stoate et al. 2001). In the model on a combination of species-specific habitat require- group of butterflies, one third of European species is ments, supply of potential habitats (area, connectiv- declining (Van Swaay et al. 2010) and even worse situ- ity) in a given region, and habitat quality, which can ation applies in individual countries, such as the Czech be manipulated by management of remnant habitat Republic, where declines have affected about half the patches (Krauss et al. 2005; Rosin et al. 2011; Thomas fauna (Beneš et al. 2002; Konvička et al. 2006). Species et al. 2001). Because management actions appropri- of seminatural grasslands rank among the most severely ate for one species may directly harm others (Bourn affected ones, because these biotopes have been main- & Thomas 2002; Dolek & Geyer 2002), diversified land tained for centuries by traditional, and now obsolete, management offers the only chance to secure diverse ar- land use techniques (Brereton et al. 2008; Poschlod et rays of specialised species both within insular reserves al. 2005). Xeric grasslands of Northern and Central Eu- and in surrounding landscapes (Čížek L. et al. 2012; rope, where many species find their northern distribu- Morris 2000; Oliver et al. 2010). A way to understand tion margins, seem to be particularly suffering due to how life history, site quality and landscape factors in- the concentration of such grasslands in warm regions teract in affecting individual species fates is studying suitable for intensive agriculture (Kadlec et al. 2010; pairs of co-occurring related species that differ in sever- Thomas 1993). Resulting declines of warm-dependent ity of their declines. Such studies have revealed such species near range margins represent a paradox, be- threat factors as insufficient immigration (Murphy et cause if suitable habitats would be present, such species al. 1986), decreased host plant accessibility (Samways should be increasing under the currently warming cli- & Lu 2007) and inappropriate management (Turlure et mate (Warren et al. 2001). It is increasingly agreed al. 2010). c 2012 Institute of Zoology, Slovak Academy of Sciences 1176 J. Šlancarová et al. Fig. 1. Grid maps of the Czech Republic, showing historical and current (post-2005) records of Polyommatus thersites and P. damon. Although gradual decline is apparent in both species, it is much more severe in the latter. Data were obtained from the Czech butterfly and moth recording scheme and Beneš et al. (2002). Symbols: grey circles: pre-2001 records, black circles: 2002–2011 records. Here, we ask how life history, within-habitat fac- September (Tolman & Lewington 2009). Larvae are faculta- tors and landscape factors affect a pair of related ly- tively myrmecophilous (Fiedler 2006; Mihoci & Šaši´c 2006). caenid butterflies that use the identical host plant, Its total distribution stretches from Morocco through South- the sainfoin (Onobrychis spp.) on xeric grasslands near ern and Central Europe to Tian Shan in the East (Tolman & their northern distribution margins in the Czech Re- Lewington 2009); the northern distribution margin crosses Central Germany and southern Poland (Kudrna 2002). Un- public. Both studied species have declined in the coun- like in Southern Europe, where it can occur at high eleva- try, Polyommatus thersites (Cantener, 1835) by 62 per tions,theoccurrenceinCentralEurope is restricted to warm cent of its 1950s distribution, and Polyommatus damon lowland areas. In the Czech Republic, the distribution fol- (Denis & Schifferm¨uller, 1775) even more severely, by lows the warmest regions both in western (i.e., Bohemia) 94 per cent (Beneš et al. 2002; and unpublished data and eastern (i.e., Moravia) parts of the country (Fig. 1). from Czech butterfly and moth recording scheme). The It forms spatially restricted colonies closely associated with same situation applies across Central Europe (Ebert & host plants occurrence, and is classified as endangered in Rennwald 1991; N¨assig et al. 2004; Zsolt 2004). Several the country (Farkač et al. 2005). authors have attributed P. damon declines to its intol- P. damon is univoltine, with adults occurring in late erance of grazing, especially by sheep, which is routinely summer (mid-July – early September). The overwintering used to maintain xeric grasslands in the region (Dolek stage is an early-instar larva (Ebert & Rennwald 1991; N¨assig et al. 2004; Weidemann 1995). Larvae are again facul- 1994; Dolek & Geyer 2002; Kudrna 1998). The evidence tatively myrmecophilous (Fiedler 2006; Mihoci et al. 2006). remains anecdotal, however, as none of the two species The distribution stretches from the Iberian Peninsula and have been studied in detail. all of Southern Europe to Mongolia in the east (Gorbunov We carried out focal observations of ovipositing 2001; Tolman & Lewington 2009). In Central Europe, it females, at a site where both species co-occur, ask- includes Switzerland, Southern Germany (rapidly decreas- ing which host plants parts, and phenological states, ing), the Czech Republic, Slovakia (no recent data) and are utilised for oviposition, and hence larval develop- southern Poland (extinct: Buszko & Maslowski 2008). In the ment. Next, we compared the presence and abundance Czech Republic, it currently survives in two disjunct areas, of both species in a wider landscape, constructing re- Ceske Stredohori Highlands (Northwest), and southeastern gression models that consider site quality, management, Moravia (Fig. 1) and is classified as critically endangered (Beneš et al. 2002; Farkač et al. 2005). and among-sites connectivity. Finally, we combine the life history and occurrence patterns to sketch a conser- vation strategy for the two butterflies. Study area The study was conducted in southeastern Moravia, a north- western promontory of the Pannonian biogeographic dis- Material and methods trict (Fig. 2). It is a low-elevated region (maximum alti- Study species tude: 383 m a.s.l.) covered by flat river plains separated by Both Polyommatus thersites and P. damon are restricted to rolling hills, with continental warm (mean annual tempera- ◦ xeric grasslands in Central Europe (Beneš et al. 2002; Wei- ture: 8.3 C) and dry (annual rainfall 500–550 mm) climate. demann 1995). They develop on sainfoins, represented by The region is renown for fertile soils and intensive agricul- Onobrychis arenaria (Kitaibel) and O. viciifolia (Scopoli) ture (about 80% of the area is farmland, including vineyards in the Czech Republic. and intensive orchards). Woodlands are sparse, mainly rep- Polyommatus thersites is bivoltine, overwintering as resented by oak-hornbeam forests. Xeric grasslands, habitat young larva and forming the first adult generation from late of the studied species, are preserved in only tiny remnants, April until June and second adult generation from June until usually on steeper slopes on base-rich loess bedrock, which Threatened Onobrychis-feeding butterflies 1177 Fig. 2. A map of sites visited while studying landscape occupancy by Polyommatus thersites and P. damon in
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