Ecological Questions 29 (2018) 2: 61– 69 http://dx.doi.org/10.12775/EQ.2018.015

Variability of morphological traits of mountain Veratrum lobelianum in lowland locality

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Jagiellonian University, Institute of Botany, Department of Plant Ecology, Gronostajowa 3 St, .UDNyZ3RODQG*e-mail: alina [email protected] Received: 2 March 2018 / Accepted: 5 May 2018

Abstract. Veratrum lobelianum is a mountain species occurring mainly in the subalpine and montane zone in European and Asian mountains. In Poland, the species has lowlands localities. Three populations of the species were characterized in the Tarnów Plateau (Sandomierz Basin, southern Poland), growing in oak-hornbeam forest and alder carrs. In the similar climatic conditions but varied light and soil conditions (humidity) the species populations differed in morphological traits as plant height, leaves number, leave dimensions, and inflorescence length. The results extend the published ranges of the traits of the species.

.H\ZRUGV biometry, ecotypes, isolated populations, mountain species, phenotypic plasticity, Tarnów Plateau.

Introduction ally situated in forest communities, most often in the sur- rounding of streams (Nowak et al., 2011; Bartoszek et al., The occurrence of mountain species outside the general 2015), mainly due to more favorable microclimatic condi- range is the interesting phenomenon that attracts scientists tions (Michalik, 1983). when analyzing general or regional flora (Szafer, 1930; One of the mountain species occurring in polish low- =DMąF   7KH FDXVHV XQGHUO\LQJ DQ RULJLQ RI ORFDO lands is Veratrum lobelianum. It represents the multi- populations, migration routes and time are considered zonal group of mountain species in lowland localities, as important questions in plant geography (Szafer, 1930; however, some authors treat this species as subalpine .RUQDĞ 0HGZHFND.RUQDĞ=HPDQHN $G- HJ3DZáRZVND 7KHLQIRUPDWLRQRIWKHGLVWULEX- ditionally, these local populations are exposed to negative tion of the species is found mainly as a result of local intra-population processes due to isolation (Mitka, 1997; IORUDLQYHVWLJDWLRQ HJ%áDV]F]\N,]GHEVND 6WDFKXUVND6ZDNRĔHWDO DQGKDYHWRFRSH .XF]\ĔVND  -DNXERZVND*DEDUD  -RVW-DNXERZ ZLWK GLIIHUHQW KDELWDW FRQGLWLRQV 6WDFKXUVND6ZDNRĔ  VND  *DZáRZVND HW DO  6]ZDJU]\N  .XĨ 7KHUHDUHPRXQWDLQSODQWWD[DZLWKORZ- %UyĪ 3U]HP\VNL&LDFLXUD:D\GD land localities in Poland (Parusel, 2016). To the lowland 8UELV]  =DMąF HW DO  %DQDFK  1RZDN areas with the highest concentration of mountain taxa HWDO-DNXERZVND*DEDUDHWDO.RZDOF]\N EHORQJ .UDNyZ&]ĊVWRFKRZD 8SODQG 1LGD %DVLQ 6LOH- 3LHUĞFLĔVND8UEDQ :yMFLDN-DUHN  VLDQ8SODQG2SROH3ODLQ5R]WRF]H 6]DIHU=DMąF 6WDFKXUVND6ZDNRĔ UDUHO\WKHGHWDLOHGKDELWDWFRQ- 1996; Nowak et al., 2011). The montane species represent ditions are characterized (e.g. Chmura et al., 2011). the largest group occurred outside the mountains ranges Previous studies on the distribution of the species out- whereas subalpine and alpine species are not often found side the mountainous area in Poland indicate a decrease 3DZáRZVND  =DMąF  7KH ORFDOLWLHV DUH XVX- of number and size of local populations and pointed at 62 Alina Stachurska-Swakoń, Kinga Kostrakiewicz-Gierałt, Joanna Świerczek

ZHDNHUYLWDOLW\ %UyĪ 3U]HP\VNL 7KHPDLQFDXVH curs in the mountain ranges of the Alps, the Carpathians, of threat to existing lowland populations is draining river the Sudetes in Europe and in Asia it in the north and after valleys and marshy areas. Despite growing interest in the a significant disjunction in the Caucasus and the moun- distribution of the species outside the mountain area, the tains of Central Asia (Meusel et al., 1965). Apart from the present state of knowledge of the populations and habitat mountains, it is found in southern Poland (Silesian Upland, conditions is still insufficient. Therefore we undertook the 0DáRSROVND 8SODQG 5R]WRF]H =DMąF  =DMąF   ,W presented investigation, which main goals were: 1. esti- has dispersed locations in Lithuania, Belarus, Finland, and mation of Veratrum lobelianum resources on the Tarnów Norway. The optimum altitude for the species is over 800 Plateau (Sandomierz Basin, southern Poland), 2. range of m above sea level, mainly on the upper montane and sub- selected morphological traits in lowland populations. alpine zone. It is a diagnostic species of the order Cala- magrostidetalia villosae, it grows in tall-grass (Poo chaixi- Veratrum lobeliani) and tall-herb communities (Adenosty- 2. Material and methods letalia alliariae).

7KHVWXGLHGVSHFLHV 7KHVWXGLHGSRSXODWLRQVDQGVWDWLVWLFDODQDO\VHV Veratrum lobelianum Bernh. (Veratrum album L. subsp. The study was carried out in the Tarnów Plateau (Sando- lobelianum (Bernh.) Arcang.) is one of the numerous spe- mierz Basin, southern Poland). The localities of the species cies belonging to the genus Veratrum (Liliales, Melanthi- were found after Wayda’s ”Flora of Tarnów Plateau” (Way- aceae) occurring in the northern hemisphere. Due to the da, 1996) and our own observation (Jarek & Stachurska- morphological similarity, the division within the genus 6ZDNRĔ &RQWHPSRUDU\WKUHHORFDOLWLHVRIWKHVSH- is unambiguous, and the number of recognized species cies were found in the Tarnów Plateau and all of them varies from 30 (Gleason & Cronquist, 1991) to 48 (Hess ZHUHWDNHQLQWRWKHVWXG\SRSXODWLRQLQ/LSLH-DVWU]ąEND et al., 1967). In the case of the taxon being the subject of DQG6P\NyZ7KHORFDOLWLHV-DVWU]ąENDDQG6P\NyZZHUH the study, taxonomists treat it either as a separate species not published before. Forest Lipie is actually part of the (e.g. Szafer et al., 1986; Mirek et al., 2002) or as a subspe- Tarnów agglomeration, it is located in the north-east part cies (Hess et al., 1967; Lauber & Wagner, 1996). of the Tarnów. Plant community in Lipie represents broad- Veratrum lobelianum is a long-lived perennial hemicryp- leaved forest: Tilio-CarpinetumDVVRFLDWLRQ-DVWU]ąENDDQG tophytic species with a stout vertical rhizome covered with 6P\NyZ DUH ORFDWHG LQ WKH DUHD RI 'ąEURZD7DUQRZVND remnants of old leaf sheaths. The unbranched and robust forestry district and both represent forest communities stem could be almost 2 m tall. The leaves are large (10-25 from Alno-Padion alliance. The localities differed in habi- cm), oblong to elliptic in shape with pointed tips and clasp- tat conditions connected with the forest type: Lipie was the ing bases. They are prominently ribbed (accordion pleated). most shadowed locality, Smyków was the moistest. The Mature plants produce long paniculate inflorescence with climatic condition in the area of Tarnów Plateau resulted green-yellow flowers. It flowers infrequently every 3-4 from its location in the Sandomierz Region climatic zone \HDUV àXNDV]\ĔVND\HDUVLQVeratrum album, with an average annual temperature of 8oC and average an- Hesse et al., 2008). However, it was observed every year QXDOUDLQIDOOPP 2EUĊEVND6WDUNORZD /HĞQLDN flowering during several years in the garden experiment 1988). 6WDFKXUVND6ZDNRĔXQSEO 7KHVSHFLHVSURGXFHVELVH[XDO 30 randomly distributed individuals with generative flowers (protandrous) and smaller male flowers. The flow- shoots were selected in each location. The number of in- ers are pollinated by insects from Diptera order (Takhta- dividuals for the study was chosen according to the small jan, 1982). The type of produced fruit is a capsule with number of flowering individuals in the studied populations. numerous seeds bearing winglike structures and dispersed The height of the aboveground part of the shoot (from the by wind. The seeds are eaten by butterfly larvae from Geo- ground level to the end of inflorescence) and the length metridae family (Varienik, 1960). Predispersal seed preda- of inflorescence was measured. The number of leaves per tion could be high (Hesse et al., 2008) as it was detected shoot was counted. Length and width were measured for IRURWKHUVSHFLHV HJ6WDFKXUVND6ZDNRĔHWDO 7KH the lowest and fifth leaf (counted from the surface level). species is also capable of vegetative reproduction by pro- All measures were taken on alive plants growing in the ducing buds on rhizome (Schaeffner et al., 2001). The plant wild. 20 capsules from every locality were collected (ran- parts contain a high concentration of alkaloids and are toxic domly) for the experiment of germination power. Half of to the animals, however it changes during vegetation season the seeds were stored at room temperature and half of them (Chmiel, 1985; Broda & Mowszowicz, 2001). were exposed to stratification (-14oC). 40 seeds from each Veratrum lobelianum belongs to the group of mountain locality were sown after two, four and six months from species, it represents the Euro-Siberian element and oc- the collection time. The field study was conducted at the Variability of morphological traits of mountain Veratrum lobelianum in lowland locality 63

beginning of September 2010. The time for study was cho- sen on the base of observation of species phenology in 3. Results this area. The differences of measured data between localities ZHUH FKHFNHG XVLQJ QRQSDUDPHWULF .UXVNDO:DOOLV WHVW Veratrum lobelianum was found in three locations in the The correlations between traits of plants in the dataset were area of Tarnów Plateau. The localities differed in the popu- tested with linear regression and polynomial regression. lation richness: in Lipie we counted about 300 individuals, All analyses perfrmed using Statistica softwere. LQ-DVWU]ąENDLQGLYLGXDOVLQ6P\NyZPRUHWKDQ

Figure 1. Average values of morphological traits of Veratrum lobelianum in the Tarnów Plateau populations. A – height of generative shoots (cm), B – number of leaves, C – length of the lowest leaf (cm), D – width of lowest leaf (cm), E – length of the ILIWKOHDI FP )±ZLGWKRIILIWKOHDI FP *±OHQJWKRILQIORUHVFHQFH/±/LSLHSRSXODWLRQ-±-DVWU]ąENDSRSXODWLRQ 6±6P\NyZSRSXODWLRQDEF±VLJQLILFDQFHZLWK.UXVNDO:DOOLVWHVWS 2SHQFLUFOHVRQWKHILJXUHDUHIRURXWOLHUV 64 Alina Stachurska-Swakoń, Kinga Kostrakiewicz-Gierałt, Joanna Świerczek

Vegetative individuals were numerous in all populations the mean of 13.6 (Fig. 1B). The significant differences and the frequency of flowering individuals was low. EHWZHHQ PHDQV ZHUH IRU /LSLH ± -DVWU]ąEND DQG /LSLH ± The height of the V. lobelianum specimens was highly Smyków. The number of leaves was positively correlated variable and ranged from 40 cm (Lipie) to 203 cm with the height of plant (Fig. 2A) when taking into account -DVWU]ąEND ,WZDVWKHVWDWLVWLFDOO\VLJQLILFDQWGLIIHUHQFH all specimens and it was described by the second-order EHWZHHQ /LSLH DQG -DVWU]ąEND DV ZHOO DV EHWZHHQ /LSLH polynomial model (y=x2-0.05x+8.2, R2=0.8, p<0.001). The and Smyków (Fig. 1A). The lowest mean was observed in length of the lowest leaf was significantly different be- the Lipie and the highest in the Smyków population. The WZHHQ/LSLH±-DVWU]ąENDDQG/LSLH±6P\NyZ7KHPHDQV standard deviation was very high in Lipie, however, this ZHUH IURP  FP LQ /LSLH WR  FP LQ -DVWU]ąEND trait fulfilled the assumption of the normal distribution. (Fig. 1C). The width of the lowest leaf was correlated with The generative shoots had from 4 to 20 leaves. The length and means ranged from 8.5 cm in Lipie to 10.3 cm smallest number of leaves was observed in the Lipie popu- LQ -DVWU]ąEND )LJ ' 7KLV FRUUHODWLRQ FKHFNHG IRU DOO lation with the mean of 8.5. The highest number of leaves data was described by the linear regression y=0.58x + 0.07, was found on specimens in the Smyków population with R²=0.75 (p<0.001). Similarly, the fifth leaf was the short-

A

B

Figure 2. Relationship between height of Veratrum lobelianumDQGOHDYHVQXPEHU $ DQGOHQJWKRILQIORUHVFHQFH % .UXVNDO Wallis test with p<0.001 Variability of morphological traits of mountain Veratrum lobelianum in lowland locality 65

est and narrowest in Lipie (16.2 cm, 9.7 cm respectively), Phenotypic plasticity has been defined as a change in WKHORQJHVWDQGZLGHVWLQ-DVWU]ąEND FPFP  the phenotype expressed by a single genotype in different (Fig. 1E, 1F). The length of the leaf was positively cor- environments and is considered one of the major means related with the width (y=0.6x+0.06, R2=0.72, p<0.001). that plants can cope with habitat variability (Gratani, The length-to-width ratio of the lowest leaf does not differ 2014). V. lobelianum seems to be one of the species with significantly between the stands and was on average 1.72. the wide ecological spectrum as it is found in wide range of Similarly, this value does not differ between the localities climatic condition (from lowland to subalpine zone), light for fifth leaf and the average was 0.54. conditions (open areas and shadowed forest). However, the The longest inflorescences were observed at the stand edaphic parameters influence morphological traits of the in Smyków with an average of 54.8 cm, and the lowest in VSHFLHVàXNDV]\ĔVND  VWXGLHGLQGHWDLOVSRSXOD- Lipie: 41.6 (Fig. 1G). A significant difference in the height tions of the species in the Sudeten Mts representing differ- of the inflorescence was between Lipie and Smyków as ent microclimatic, soil and coenotic conditions. Based on ZHOODV/LSLHDQG-DVWU]ąEND,WZDVWKHSRVLWLYHFRUUHOD- results she pointed the existence of ecotypes that differed tion between inflorescence length and plant height. This in morphological features, i.e. height of generative stems, relationship was the best described by a second-order poly- leaves number, length of inflorescence being the response 2 nomial (Fig. 2B, a1=-0.006, a2=2.41b=-180.38, R =0.92, to habitat factors (mainly edaphic features). She found the p<0.001). positive correlation between the content of Mg, Ca, and The mean number of seeds per collected capsule was pH of soil and height of the plants and length of the inflo- LQ6P\NyZSRSXODWLRQDQGLQ-DVWU]ąENDDQG/LSLH rescence. In the studied Sudeten populations, the height of The difference between localities was not significant. The generative shoots was in the range from 24 to 186 cm with experiments with the seeds were negative, as the seeds did the average highest 136 cm out of 16 studied populations. not germinate. The length of the inflorescence ranged from 6 to 72 cm and it was a trait with quite a high variability, with the high- est average of 48 cm. The number of leaves varied from 4 'LVFXVVLRQ to 17 with the highest average 12. These values are lower than those observed on the Tarnów Plateau. The obtained In mountain conditions, Veratrum lobelianum usually results and their comparison with the results for moun- grows in open areas: natural grasslands, tall-grass, and tain populations indicate the high phenotypic plasticity of WDOOKHUE FRPPXQLWLHV 3DZáRZVNL  àXNDV]\ĔVND the species. Similar results referring to plant height: lower 1998). Lowland populations of the species were found in mountain conditions, higher in lowland localities, were in the forest communities: in the oak-hornbeam forest, observed for Doronicum austriacum 6WDFKXUVND6ZDNRĔ mainly moist variant (Carpinion betuli alliance) and in  .XĨ   %RWK VSHFLHV LH Doronicum austriacum alder carrs (Alno-Padion alliance) or rarely in wet mead- and Veratrum lobelianum, are subalpine (or multizonal) RZV *DZáRZVNDHWDO%UyĪ 3U]HP\VNL plants, often growing together in tall-herb communities Nowak et al., 2011). From the literature, it can be assumed HJ6WDFKXUVND6ZDNRĔ DQGVRPHWLPHVWRJHWKHULQ that for the occurrence of the species, the high level of lowland forest localities (Czylok & Stanek, 2000; Chmura groundwater and high abundance of nutrients are im- et al., 2011). The phenomenon of taller plants under shadow SRUWDQW %UyĪ  3U]HP\VNL  àXNDV]\ĔVND  conditions is the result of modifications of morphological Chmura et al., 2011). The size of the lowland popula- features under conditions of lower light availability. On tions was reported differentiated: from several individu- WKH RWKHU KDQG REVHUYDWLRQV RI RWKHU DXWKRUV .OHLMQ  DOVWRVHYHUDOWKRXVDQGH[WHQGHGLQODUJHDUHDV %UyĪ  Steinger, 2002; Hesse et al., 2008) proved that in grazed Przemyski, 1988). The populations studied on the Tarnów pastures the unpalatable stems of Veratrum album might Plateau were growing in both types of forest communities: attain the considerable height in effect of favorable light Lipie is a moist subassociation of the oak-hornbeam for- conditions. Also, the laboratory experiments conducted in HVW6P\NyZDQG-DVWU]ąENDUHSUHVHQWDOGHUFDUU%DVHGRQ Veratrum californicum (Sun et al., 2013) proved, that the the observation, it can be assumed that the soil and micro- supplemental light initially enhanced the increase of stem climatic conditions are sufficient for the occurrence of the height. Our results showed the highest individuals of V. species. The abundant population in Lipie and Smyków lobelianum in the population located in Smyków – locality, allow us to hope for the preservation of the population, as- where the considerable soil humidity was recorded. Simul- suming no drastic changes in habitat conditions. The Lipie taneously, it should be pointed out, that phenomenon ob- forest, situated in the Tarnów agglomeration, is particu- served in populations of V. lobelianum correspond with the larly valuable due to the high diversity of plants, however, scenario found in other plant taxa occurring in lowlands. it is also more vulnerable to the pressure of man’s activity They create higher generative stems in habitats overgrown -DUHN 6WDFKXUVND6ZDNRĔ  by trees, shrubs, and macroforbs characterizing by sub- 66 Alina Stachurska-Swakoń, Kinga Kostrakiewicz-Gierałt, Joanna Świerczek

stantial soil humidity, than in open sunny habitats such anum in the artificial conditions confirms the observations as meadows or calcareous grasslands dominated by low- RI&]DSOLĔVND  DERXWWKHQHHGIRUP\FRUUKL]DOIXQJL statured species. Such phenomenon was observed in many to start germination. The experiments with seed sowing in herbaceous species i.e. Gladiolus imbricatus .XELNRYD the field on V. album pointed at the considerable change =HLGOHU.RVWUDNLHZLF]*LHUDáW Gentiana in the consecutive years showing that the species forms pneumonanthe .RVWUDNLHZLF] Filipendula vulga- a short-term persistent seed bank (Hesse et al., 2007). ris .RVWUDNLHZLF]*LHUDáW 6WDFKXUVND6ZDNRĔ  Summarizing, our findings correspond with the conven- tional wisdom assuming that plant height is one of the 5. Conclusion traits, which are mostly depending on habitat conditions (Harper, 1977). The present results demonstrate the ability of Veratrum lo- The greatest number of leaves was observed in the belianum to grow under different habitat conditions. In the population located in Smyków and the average was higher similar climatic conditions but varied light and soil condi- than in the Sudeten populations (13.6 versus 12). It can tions, the species populations produce statistically different be assumed that a greater number of leaves is the result aboveground shoots. It is compatible with the statement of of the most favorable soil conditions: soil moisture and àXNDV]\ĔVND  WKDWWKHVSHFLHVFRXOGFUHDWHHFRW\SHV soil content. It was observed, that when plants grow under We can assume that the soil conditions, in particular hu- low irradiance but with mineral nutrient and water sup- midity, are the most important for the plant growth and ply it resulted in increased growth, SLA or aboveground reproduction (both generative and vegetative) as the size dry mass (e.g. Peace & Grubb, 1982; Quinet et al., 2015; of the population, plant height, leave number, leave dimen- %DUDEDV].UDVQ\ HW DO   ,QFUHDVLQJ OHDI DUHD DQG sions, length of inflorescence and seed production was the maintaining integrity of photosystems under low-light highest in Smyków locality. This results also show the abil- condition is a way to maximize light acquisition (Quinet ity of the species to maximize the light acquisition under et al., 2015). The high number of leaves and its dimen- low irradiance. Its phenotypic plasticity could be treated sions in studied forest populations of V. lobelianum could as optimistic in the light of the global climatic change that be the adaptation to low irradiation under good soil con- negatively influences on distribution and occurrence of dition. The highest number of leaves in forest conditions PRXQWDLQVSHFLHV HJ.HOO\ *RXOGHQ'LUQE|FN is in contradiction with the observations of another subal- et al., 2011; Solár & Janiga, 2013). pine species growing in lowlands Doronicum austriacum 6WDFKXUVND6ZDNRĔ  .XĨ   0RUH IDYRUDEOH VRLO conditions result in higher plants with bigger leaves also References longer inflorescences. The positive correlation of plant height and inflorescence length confirms the results ob- Banach B., 2008, Rare and protected species in the drain- WDLQHGE\àXNDV]\ĔVND  /RQJHULQIORUHVFHQFHVDUH age ditches and adjacent phytocoenoses in the Polesie likely to produce a larger number of flowers – although this National Park. Acta Agrobotanica 61(2): 103-111. trait has not yet been studied in the V. lobelianum. A very %DUDEDV].UDVQ\ % 0RĪGĪHĔ . 6RáW\V/HOHN $  interesting result is the dependence of the second-order 6WDFKXUVND6ZDNRĔ$%LRORJLFDOWUDLWVRIImpa- polynomial: at a certain height of plants (here about 170 tiens parviflora DC. under different habitat conditions. cm), the length of the inflorescence does not increase pro- Notulae Botanicae Horti Agrobotanici 46(1): 277-285. portionally. Whether this relationship is a general rule for %DUWRV]HN:%DUFL .  6WDFKXUVND6ZDNRĔ$  the species it requires further research. Moreover, obser- Mountain species in the flora of the Sopotnia Wielka vations conducted in populations of V. album showed, that creek (Western Beskids, Poland). Acta Musei Silesia- individuals growing on nutrient-rich pastures have a larger cae Sciences Naturae 64(3): 269-273. overall size, size of inflorescence and ultimately seed out- %áDV]F]\N+)ORUDSRZLDWXZáRV]F]RZVNLHJR>)OR- put per year than plants growing on poor soils (Schaffner UD RI WKH GLVWULFW RI:áRV]F]RZD 6RXWKHUQ 3RODQG @ et al., 2001). Plant size and the size-dependence of traits Fragmenta Floristica et Geobotanica 5(1): 47-96. define important relationships between form and function Bonser S.P., 2013, High reproductive efficiency as an (Niklas, 2004). Allocation to reproduction is a key aspect adaptive strategy in competitive environments. Func- of plant adaptive strategies across environments (Bonser & tional Ecology 27: 876-885. Aarsen, 2009; Weiner et al., 2009; Bonser, 2013). Bonser, S.P. & Aarssen, L.W., 2009, Interpreting reproduc- Experiments with seed sowing were inspired by obser- tive allometry: individual strategies of allocation ex- vations of other Veratrum species that required a differ- plain size-dependent reproduction in plant populations. ent time of freezing to germinate (even up to 4.5 months) Perspectives in Plant Ecology, Evolution and Systemat- (Taylor, 1956). However, lack of germination of V. lobeli- ics 11: 31-40. Variability of morphological traits of mountain Veratrum lobelianum in lowland locality 67

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