POLISH JOURNAL OF ECOLOGY (Pol. J. Ecol.) 61 1 13–22 2013 Regular research paper Agnieszka KOMPAŁA-BĄBA1*, Wojciech BĄBA2 1 Department of Geobotany and Nature Protection, Silesian University, Jagiellońska 28, 40-032 Katowice, Poland, *e-mail: [email protected] (corresponding author) 2 Department of Plant Ecology, Institute of Botany, Jagiellonian University, Lubicz 46 31-512 Kraków, Poland THE SPONTANEOUS SUCCESSION IN A SAND-PIT – THE ROLE OF LIFE HISTORY TRAITS AND SPECIES HABITAT PREFERENCES ABSTRACT: The prediction of species response to human activity is of great interest in contemporary restoration ecology. The purpose of the article was to analyse which species life history traits and species habitat preferences are important during succession after the abandonment of mining activity in a sand-pit. During a 15-year period (1996–2010), 176 phytosociological relevés were placed within vegetation patches of different ages and divided according to soil moisture, thus forming two series of chronosequences that ranged from 0 to ca. 50 years. The datasets were analysed using both DCA/CCA ordinations and regression trees. The successional gradient, apart from the theoretically predicted replacement R by C strategists, revealed the occurrence of stresstolerant ruderals and competitive ruderals in the early successional stages. However, differences were observed between the wet and dry series. On dry soils the ruderals, anemochorous and windpollinated species dominated in the early phases. In the middle successional phases, a preponderance of anemochorous species (nanophanerophytes, light or semi-shade demanding species), nitrogen-poor and competitive ruderals or species typical for nitrogen-rich soils was recorded. In the late successional stages, species with both the ability of vegetative and generative reproduction appeared. On the other hand, on wet sites in the early successional phases, species with vegetative growth, hydrophytes, chamaephytes and stresscompetitors prevailed. Later in the succession, journal 33.indb 13 they were replaced by insect-pollinated species in nitrogen rich habitats and stress-tolerant ruderals on less fertile habitats. Finally, competitors started to prevail. Knowledge of the environmental conditions of a given site, the ecological processes and species biology can assist in achieving the desired goals or in initiating or enhancing succession on some disturbed sites. KEY WORDS: life history traits, habitat preferences, succession, ordination, sand-pits, regression trees 1. INTRODUCTION Man-made disturbances caused by the mining industry lead to drastic changes in both the abiotic and biotic elements of a given area and often results in the total destruction or depletion of vegetation or animal communities, thus their restoration is of prime interest to ecologists and conservationists. However, in spite of the accumulation of knowledge on successional processes (Fa lińska 2003, Hobbs et al. 2007, Pickett et al. 2005, 2008, Wa l ker et al. 2010, Prach and Wa l ker 2011), the ecological restoration of vegetation on post-industrial areas is still a challenging task (Ho d ačová and Prach 2003, B ar t ha et al. 2004, Ř ehoun ková and Prach 2006, 2008, 2013-04-30 10:04:53 14 Agnieszka Kompała-Bąba, Wojciech Bąba Prach and Hobbs 2008, Prach and Wa l ker 2011). On the other hand, the spontaneous colonisation of species provides the opportunity to follow the changes in species composition and structure through time and in space. The colonisation of a given area can be connected with many factors which reduce the initial, potential species pool via biotic and abiotic filters: climatic conditions, availability and diversity of local site conditions (the amount of available resources, light, water holding capacity, granulometric composition, soil reaction and moisture), propagule availability and interactions with other species. The dispersal mode (both long-distance and small-scale dispersability) to open sites can also limit species-richness (Z ob el 1997, Pos ch lo d et al. 2005). Communities which are created during colonisation can be spatially heterogeneous. Such spatial heterogeneity is the result of a rich variety of the kinds and intensities of disturbances that affect colonisation and the surrounding landscape. Species possess a suite of abilities that enable them to exploit available resources, grow, persist and reproduce (B azzaz 1996). Life history traits, relative growth rate (RGR), life span, stress tolerance, herbivory and predator defence are some of the specific features that determine differential performance (Vitouš ek et al. 1998). A lack of the necessary traits can mean that species cannot pass through some environmental filters of changing environmental conditions and get to given sites in spite of being present in the local species pool. Knowledge about the life history traits of species and their habitat preferences, which are responsible for their colonisation success, seems to be very helpful in preparing successful restoration projects on a variety of wastelands (van Andel and Arons on 2006, Ř ehoun ková and Prach 2008, 2010, Trop ek et al. 2010, Prach and Wa l ker 2011). The purpose of the article was to analyse: • what is the pattern of species life history traits along a successional gradient in a sand-pit, • what are the habitat preferences of a species during succession, • whether such patterns are similar to those observed in other types of postindustrial wastelands (e.g. gravel sandpits, abandoned quarries, spoil heaps). journal 33.indb 14 2. STUDY AREA The study was performed in 1996–2010 in the “Kuźnica Warężyńska” sand-pit, which is situated in the southern part of Poland [50°21’–50°24’N, 19°11’–19°13’E]. It comprises an area of 870 ha. Most of the soils are loose sands with an acidic soil reaction (pHH2O = 5.0–6.0), a low capacity of the sorption complex, a low retention capacity, poor in nutrients and susceptible to drying. Other groups of sands that were deposited here mainly contained a calcareous gravel admixture and locally silty-argillaceous inter-layers. Before excavation of sand the level of the ground water table extended from 1 to 6.5 m. It was oligotrophic or mesotrophic and contained Ca, Mg ions (Krz a k l e w sk i 1999). The history of the sand-pit was reconstructed on the basis of direct field observations and the records of mining company, including the forest valuations. The mining activity in the area started in 1967 and was conducted until 2005. Because the excavation of the sand was not carried out simultaneously in the whole area, patches which differ in reference to the time of abandonment were created. The abandoned area had not been reclaimed, so spontaneous vegetation could develop as a result of succession. A preliminary analysis of the vegetation data (not shown) revealed a strong differentiation of species composition according to the soil moisture gradient, thus in the further analysis, we considered two series of sample plots on dry and wet soils. Each of them was divided into successional stages taking into account: (i) the year of abandonment and (ii) the presence of spontaneous vegetation. Three successional stages were distinguished based on arbitrary age classes: young (1–10 years), middle (11–25 years) and late (>25 years). Based on these classes, we assessed the differences in the species traits of early, middle and late successional species. 3. MATERIALS AND METHODS In total 176 phytosociological relevés (5 m ´ 5 m) were recorded in the field using the Braun-Bl anquet (1964) approach. Basic life history traits (strategy type, life forms, type of reproduction, self-sterility, pollen vec- 2013-04-30 10:04:53 The spontaneous succession in a sand-pit tor, dispersal and diaspore weight) and habitat preferences (Ellenberg indicator values for light (L), moisture (M), fertility (N) and soil reaction (R) (E l lenb erg et al. 1991; explanations in Table 1) were considered. Life history traits were compiled from existing databases such as: Diasporus (B onn et al. 2000), Gr ime et al. (1988), BIOPOP (Jackel et al. 2006), BIOLFLOR (Fran k and K lotz 1990, K lotz et al. 2002), PHANART (L ind acher 1995). Because species can belong to several classes of particular trait and habitat preferences in order to include complete information, fuzzy coding was used (L epš and Šmi l auer 2003). To evaluate which species traits can be important during a particular stage of the succession of the sand pit, the ordination (CANOCO 4.5, ter Braa k and Šmi l auer 2002) and regression tree methods (R package, R Development Core Team, 2011) were performed. A preliminary analysis of species data (not shown) revealed that gradient length exceeded 4 SD, thus the unimodal relationship between the species characteristics and time was considered and DCA and CCA ordinations were used. The CCA was carried out using MOISTURE (which divided the sites according to their Ellenberg indicator values) as only one explanatory variable. The scores of the species on the ordination axis were then used as the response to the age of site. Next, Detrended correspondence analysis (DCA) with species traits and habitat preferences as a “species data” was performed. The explanatory “environmental variables”: species response to the MOISTURE and the age of site (AGE) were fitted ex post as supplementary passive environmental variables (L epš and Šmi l auer 2003). Regression trees were used to determine which species with what traits and habitat characteristics occurred in a given successional stage on “dry” and “wet” series. The length of the trees was controlled by the best trade-off between the size of the tree and explained deviance via pruning, an analogue of variable selection in regression (Brei man et al. 1984, Thui l ler et al. 2003). 4. RESULTS Overall, 321 vascular plant species were found – 229 on dry and 253 on wet series. The number of species on both series decreased journal 33.indb 15 15 Fig. 1. DCA ordination performed on life history traits (life forms, strategy, pollen vector, dispersal mode, reproduction, self-sterility) and habitat preferences of species (light, moisture, nitrogen, soil reaction/base saturation). Abbreviations: life form (Th – therophyte, Ch – chamaephyte, G – geophyte, Hy – hydrophyte, Na – nanophanerophyte, Me – megaphanerophyte, H – hemicryptophyte); C, R, SR, CR, CS, S, CSR – strategy type; reproduction (Sv – mostly seeds, sv – seed and vegetative, Vs – mostly vegetative); pollen vector (wind, ins - insect); dispersal type (anemo – anemochory, epizoo – epizoochory, endoz – endozoochory, autoc – autochory), self-sterility (S-C – self-compatible, S-I – self-incompatible); Ellenberg Indicators Values: soil reaction (acid 1–5, neu - neutral 6–7, basic 8–9; light (shade 1–3, semsha - semi-shade 4–6, L - light 7–9), moisture (dry 1–4, mesic 5–8, wet 9–11), nitrogen (poor 1–3, intermediate 4–6, rich 7–9). compared to the young and late stages: from 152 to 96 on the “dry” and from 165 to 126 on the “wet” series. The DCA analysis indicated the most important life history traits and habitat preferences of species in the course of succession (Fig. 1). The eigenvalues of the first and second axis were 0.68 and 0.35, respectively. The variable AGE represents the gradient, which disregarding the differences between the dry and wet series, is mostly in agreement with the theoretical pattern of successional replacement. On the young sites, a preponderance of therophytes, R (R, CR, SR) and CSR, anemochorous, light-demanding and self-compatible species typical for ruderal and segetal communities was observed. Later in the succession, they were replaced by the 2013-04-30 10:04:53 16 Agnieszka Kompała-Bąba, Wojciech Bąba Fig. 2. Regression tree analysis used for predicting colonisation success in dry (A) and wet series (B) in the “Kuźnica Warężyńska” sand-pit performed on life history traits (life form, strategy, pollen vector, dispersal mode, reproduction, self-sterility, diaspora weight) and habitat preferences of species. Abbreviations: C, R, SR, CR, CS – strategy type; life form (Ch – chamaephyte, Hy – hydrophyte, Na – nanophanerophyte), Ellenberg Indicators Values: nitrogen (poorN 1–3, intN 4–6, richN 7–9); reproduction (Sv – mostly seeds, sv – seed and vegetative, Vs – mostly vegetative), pollen vector (wind, insect); dispersal type (ane – anemochory, endoz – endozoochory, aut – autochory), diaspora weight (LightD – light diaspore, HeavyD – heavy diaspore) Achi mill – Achillea millefolium, Agro capi – Agrostis capillaris, Alis pla – Alisma plantago-aquatica, Anth vuln – Anthylis vulneraria, Aren serp – Arenaria serpyllifolia, Arte camp – Artemisia campestris, Betu pend – Betula pendula, Bide fron – Bidens frondosa, Cala epig – Calamagrostis epigejos, Call vulg – Calluna vulgaris, Care acut – Carex acutiformis, Care flav – Carex flava, Care oede – Carex oederi, Cent umbe – Centaurium umbellatum, Cori lept – Corispermum leptopterum, Cory cane – Corynephorus canescens, Coro vari – Coronilla varia, Crep bien – Crepis biennis, Dauc caro – Daucus carota, Desc case - Deschampsia caespitosa, Desc flex – Deschampsia flexuosa, Digi isch – Digitaria ischaemum, Dros rotu – Drosera rotundifolia, Eleo palu – Eleocharis palustris, Epip hell - Epip helleborine, Equi vari – Equisetum variegatum, Erig acri – Erigeron acris, Eupa cann – Eupatorium cannabinum, Fest ovin – Festuca ovina, Fest rubr – Festuca rubra, Heli numm – Helianthemum nummularium, Hern glab- Herniarnia glabra, Hiera pilo – Hieracium pilosella, Holc lana – Holcus lanatus, Isol seta – Isolepis setacea, Jasi mont – Jasione montana, Junc arti – Juncus articulatus, Junc bufo – Juncus bufonius, Junc effu – Junc effussus, Koel glau – Koeleria glauca, Lotu corn – Lotus corniculatus, Lyco clav – Lycopodium clavatum, Lyco inun – Lycopodiella inundata, Lyco euro – Lycopus europaeus, Lysi vulg – Lysimachia vulgaris, Lyth sali – Lythrum salicaria, Meli alba – Melilotus alba, Medi journal 33.indb 16 2013-04-30 10:04:57 The spontaneous succession in a sand-pit hemicryptophyte, epi- and endozoochorous, semi-shadow, wind-pollinated species and finally by C-strategists, mega- and nanophanerophytes. Moreover, the differences between the dry and wet series were detected. On the dry sites, the species typical of acid, nutrient-poor sites, chamaephyte, stresstolerant, self-incompatible species prevailed, while the wetter sites were dominated by stress-competitors and species that prefer nutrient-rich and neutral soils with predominant clonal growth. The regression trees analyses revealed a more detailed, hierarchical relationship between the life history traits and habitat preferences. The species in the early successional stages on dry soils were ruderal, mostly anemochorous, wind pollinated and if not anemochorous then confined to nutrient-poor habitats, if not nutrient poor then endozoochorous (Fig. 2A). In the middle successional phases (11–25 years), a preponderance of anemochorous species was observed, both nanophanerophytes, light or semi-shade demanding species. If not anemochorous, then nitrogen-poor and competitive ruderals or species that are typical of nitrogen-rich soils and chamaephytes (Fig. 2A). In the late successional stages, the main difference on dry sites was the presence of species with the ability to both vegetative and generative reproduction. On the other hand, species which colonised the young wet sites were mainly clonal plants, chamaephyte, hydrophyte or competitive stress-tolerators. If they reproduce mainly by seed, they have either heavy or light diaspores (Fig. 2B). Later in the succession, they were replaced by insect-pollinated species that prefer habitats richer in nitrogen or stress-tolerant ruderals on soils with a lower amount of nitrogen and finally with species having a strong competitive ability. 17 5. DISCUSSION AND CONCLUSIONS Vegetation changes during succession in abandoned sand-pits are associated with both habitat conditions (light, soil moisture, nitrogen content, soil reaction) and life history traits, which enable species to colonise, coexist, compete or regenerate after some disturbances (Gr i me 2002, P y wel l et al. 2003, Frou z et al. 2008, Ř ehou n kov á and Pr a ch 2010). The results of our research confirmed, given in other papers, the significant role of moisture as a main environmental factor that is responsible for the development, growth and a large amount of vegetation variability of vegetation, as well as the increase of wet grasslands and woods (F i e r ro et al. 1999, Ř ehou n kov á and Pr a ch 2006). The general pattern of growth forms during succession in a post-mining landscape from therophytes to hemicryptophytes and phanerophytes observed in this study (shows by the DCA; Fig. 1) was reported in previous works (Brow n 1991, Huston and Sm it h 1987, Pr a ch et al. 1997). However, Ř ehou n kov á and Pr a ch (2010) found that in the early stages of the colonisation of abandoned gravel-sand pits chamaephytes were more successful in comparison to therophytes. According to Woź n i a k (2010) the significant participation of chamaephytes on young spoil heaps was probably connected with the presence of Chamaenerion palustre with a higher frequency and abundance. Moreover, undemanding hemicryptophytes and chamaephytes were also recorded during the first stage of succession on the moraine of the Aletsch glacier, which was explained by harsh habitat conditions (nutrient poor, acidic soils) (S chu lz e et al. 2002). Wi e g l eb and Fel i n ks (2001) found that therophytes were only of minor importance in a post-mining landscape, even in pioneer stands in con- Fig. 2. cont. falc – Medicago falcata, Moli caer – Molinia caerulea, Oeno bien – Oenothera biennis, Orth secu – Orthilia secunda, Phra aust – Phragmites australis, Pinu sylv – Pinus sylvestris, Plan lanc – Plantago lanceolata, Popu trem – Populus tremula, Pota pect – Potamogeton pectinatus, Rume aceto – Rumex acetosella, Sagi nodo – Sagina nodosa, Sali capr – Salix caprea, Sali purp – Salix purpurea, S. repe – Salix repens, Sali rosm – Salix rosmarinifolia, Sang mino – Sanguisorba minor, Scle pere – Scleranthus perennis, Seta viri – Setaria viridis, Sisy alti – Sisymbrium altissimum, Soli cana – Solidago canadensis, Soli gram – Solidago graminifolia, Thym serp – Thymus serpyllum, Thym pule – Thymus pulegioides, Trig palu – Triglochin palustre, Tuss farf – Tussilago farfara, Typh angu – Typha angustifolia, Typh laxm – Typha laxmanii, Verb lych – Verbascum lychnitis. journal 33.indb 17 2013-04-30 10:04:58 18 Agnieszka Kompała-Bąba, Wojciech Bąba trast to hemicryptophytes, which dominate on all study sites. Woźni a k (2010) recorded a high participation of therophytes on the 10–30 years old spoil heaps but hemicryptophytes were the most frequent dominants there. Prach et al. (1994) examined changes in species traits during succession on urban, post-industrial wastelands and detected that hemicryptophytes and geophytes did not exhibit any clear trend in the data set. Other research showed that replacement from terophytes to hemicryptophytes during succession takes place only on poor quality substrates (broken waste (<15 mm – by product of uranium extraction), whereas on better quality substrate, no clear trend in life forms was detected (Mar t ine z-Ruiz and Mar rs 2007). In relation to the dispersal mode, anemochory and zoochory were the most frequent dispersal mechanisms on the studied sandpit even in the early stages of succession on the dry series, which is similar to research conducted on uranium mine wastes (Mart ine z -Ruiz and Mar rs 2007). However, Wieg leb and Felin ks (2001) did not detect any change in the predominance of individual dispersal mechanisms in post-mining landscapes. In contrast, on wet sites, zoochorous species started to play an important part in later stages of succession. Hydrophytes could extend their colonisation range regardless of successional age, because as a result of mining activity, the area of the sand-pit was covered with drainage ditches, whose numbers and sizes were constantly changing. K hate r et al. (2003) discovered that limestone quar ries were dominated by annuals or opportunistic chamaephytes that spread mainly via antropochory, which probably enables them to disperse in large quantities and to establish themselves in open sites successfully. Ř ehoun ková and Prach (2010) found that in the case of succession in gravel sand-pits, a kind of replacement between the types of dispersal could not be found because anemochory, zoochory and hydrochory appeared to be more or less neutral to succession. L atzel et al. (2011) examined ruderal urban sites and spoil heaps found that seed dispersal by water was the most important mode of dispersal at the beginning of succession even in areas distant from wetlands, and journal 33.indb 18 that the prevalence of anemochory increased slightly during succession. Our results, similar to those obtained in other types of wastelands (quarries, mine spoils), indicate that ruderal species with broad ecological amplitudes can prevail in the initial seral stages on dry sites, whereas more specialised wetland species occur on the wet sites and canals crossing the area of a sandpit (B orgegård 1990, Ř ehoun ková and Prach 2006). Woźni a k (2010) found that species with an S, CR strategy occur more frequently on heaps where spoil substrates were stored irregularly, whereas the number of species with S, CR was comparable regardless of the method of storage. P y wel l et al. 2003 found that short-lived, early flowering ruderals with a heavy allocation to reproduction mainly colonised open, undisturbed habitats. In contrast, Wieg leb and Felin ks (2001) found that competitors and stress-tolerant competitors predominate in the initial phases during primary succession, or if not, then stress-tolerant ruderals and C-S-R strategists prevail in vegetation types. Research conducted in a gravel-sand-pit showed that species with an S strategy had the highest colonisation success (B orgegård 1990, Ř ehoun ková and Prach 2006). D öl le et al. (2008) exami� ned changes in life history trait composition during undisturbed old-field succession and found that the annual stage was dominated by ruderals and competitive species. The ruderals showed a significant decrease during succession and have no relevance in the pioneerforest stage. In contrast, competitive species showed a clear increasing rate from almost 45 to 95%. R-strategists (mainly annuals) constitute a major proportion of species that were recorded after profound disturbances in quarries. Whereas their number and cover decreased during colonisation, myrmecochorous and barochorous native species, mainly clonally spreading perennial species or shrub, appeared (S or S-R strategists) (K hater et al. 2003). A set of specific traits referring to competition such as: C-strategy, high stature, ability to spread laterally, higher demand for moisture and nutrients enables some species such as: Calamagrostis epigejos, Solidago canadensis, Carex acutiformis, Phragmites australis to become the dominants during the course of 2013-04-30 10:04:58 The spontaneous succession in a sand-pit succession and means that those species are better suited to the environment than minor species (Prach and P yš ek 1999, Br z o sko 2000, L atzel et al. 2011). Species such as Carex acutiformis, C. rostrata can occupy a vast area in a relatively short period of time because they form new shoots which grow exponentially (Brzosko 2000, Pr a ch and P yš ek 2001). Some results show that soil moisture appears to be a factor significantly supporting the success of clonal species (Prach and P yš ek 1994, 2001). Solidago graminifolia started to spread in the sand-pit area in sites, where the level of the ground water table was high and as a result of a disturbance caused by soil disintegration and the transport of rhizomes (Komp a ł a - B ąb a and B ąb a 2006). The type of reproduction was particularly important in the early stages of succession in a sand-pit on a wet series. Some species that reproduced mostly by seeds (Centaurium erythraea, Sagina nodosa) occupied a small area of bare sand, sometimes close to drainage ditches. Some rare species such as Lycopodiella inundata, Lycopodium clavatum or shrubs - Salix rosmarinifolia, propagate vegetatively. The early stage of succession in undisturbed old-fields was dominated by species which reproduce exclusively or mostly by seeds, which participation decreased significantly over time. Species that reproduce both by seeds and vegetatively in equal amount show a slight increase as do species that rarely reproduce in a vegetative manner or mainly by seeds. Mainly vegetative reproduction was of no importance at any time of the successional stages (D öl le et al. 2008). According to L atzel et al. (2011), dispersal and persistence traits (clonality, vegetative regeneration) could along with other factors (regional species pool, habitat conditions), be important determinants of the changes of vegetation that occur during succession. Scientific research conducted in quarries and sand-pits may provide valuable habitats (wetlands, peat-bogs) for many rare and endangered species and act as local centres of floristic diversity in a given landscape (G e m mel l 1982, Prach and P yš ek 2001, Nov á k and Prach 2003, Nová k and Konv i čk a 2006, Bzdon 2008, Komp ała -B ąb a and B ąb a 2009, Trop ek et al. 2010, Tr n kov á journal 33.indb 19 19 et al. 2010, Ř ehou n kov á and Ř ehounek 2011). Disturbances such as the removal of accumulating litter, mechanical disturbances of wet sand, lightly scored patches, periodic grazing that constantly lead to the creation of microhabitats may enable populations of rare species to be saved and protected, among them Lycopodiella inundata, Liparis loeselii (Whe eler et al. 1998, Ř ehou n kov á and Ř ehou nek 2011). The last species possesses many traits such as: rapid regeneration from seeds and spores, high rates of turnover of individual plants, short-lived plants (2–3) and can grow on sites with low fertility but with a relatively high and stable ground water table (Jone s 2008, Whe el er et al. 1998). However, as a result of the cessation of frequent disturbances caused by sand exploitation, a thick moss layer was formed on some sites, which has an influence on the Liparis loeselli population and more expansive grass species (Phragmites australis) started to encroach (Komp a ła -B ąb a and B ąb a 2009). As was already stated, knowledge of the environmental conditions of a given site, on ecological processes (dispersal, competition) and species biology (life history traits) and the functioning of an ecosystem (e.g. nutrient cycle) together with spontaneous succession can help in achieving the desired goals or in initiating and enhancing the succession process in some disturbed sites through the choice of appropriate species for restoration purposes (B ąb a et al. 2012, B ąb a , Komp ał a-B ąb a 2005, Prach et al. 2001, Wi eg leb and Feli n ks 2001, K hater et al. 2003, Pr a ch and Wa l ke r 2011). In comparison to technical restoration, ecological restoration enables a mosaic of various habitats with prevalence of native species and lesser cost of restoration. As a result, the floristic (measured as the number of species, the prevalence of native species in the flora) and the vegetation diversity of a given area increases. 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