- Open Access
Biogeographical and evolutionary importance of the European high mountain systems
© Schmitt; licensee BioMed Central Ltd. 2009
- Received: 11 February 2009
- Accepted: 29 May 2009
- Published: 29 May 2009
Europe is characterised by several high mountain systems dominating major parts of its area, and these structures have strongly influenced the evolution of taxa. For species now restricted to these high mountain systems, characteristic biogeographical patterns of differentiation exist. (i) Many local endemics are found in most of the European high mountain systems especially in the Alps and the more geographically peripheral regions of Europe. Populations isolated in these peripheral mountain ranges often have strongly differentiated endemic genetic lineages, which survived and evolved in the vicinity of these mountain areas over long time periods. (ii) Populations of taxa with wide distributions in the Alps often have two or more genetic lineages, which in some cases even have the status of cryptic species. In many cases, these lineages are the results of several centres of glacial survival in the perialpine areas. Similar patterns also apply to the other geographically extended European high mountain systems, especially the Pyrenees and Carpathians. (iii) Populations from adjoining high mountain systems often show similar genetic lineages, a phenomenon best explained by postglacial retreat to these mountains from one single differentiation centre between them. (iv) The populations of a number of species show gradients of genetic diversity from a genetically richer East to a poorer West. This might indicate better glacial survival conditions for this biogeographical group of species in the more eastern parts of Europe.
- Genetic Lineage
- Mountain System
- Refuge Area
- High Mountain Area
The evolution within species and sibling species complexes in Europe is closely connected to the range shifts caused by the cyclic changes between relatively short and warm, mostly humid and longer cold and predominantly dry periods [1, 2]. These climatic shifts resulted in large scale range shifts in many species often resulting in disjunct distribution pattern during at least one of these phases [3, 4]. However, the effects of these climatic fluctuations vary considerably in different ecological and distributional groups [5, 6], and three major groups can be distinguished: Mediterranean, continental and arctic/alpine species , which are all to some degree influenced in their biogeography and evolution by the complexity of the European high mountain systems.
The Mediterranean species survived the cold stages of the Pleistocene in the Mediterranean Basin and expanded northwards during the postglacial [7, 8]. These expansions are largely shaped by the high mountain systems of the Alps and Pyrenees acting as dispersal barriers of different strength so that four different paradigms of postglacial range expansions from the three Mediterranean peninsulas can be distinguished [9, 10]. In contrast to the assumptions made by de Lattin , the continental species, which in most cases have not immigrated into Europe from Asiatic core areas during the postglacial, had so called extra-Mediterranean refuge and differentiation centres north of the typical Mediterranean refugia. These were also strongly influenced by the European mountain systems because they offered suitable refuge areas in their non-glaciated parts during ice ages and acted as dispersal barriers during postglacial range shifts [e.g. [11–19]].
The group of alpine and arctic-alpine species is most strongly shaped in their biogeographical and evolutionary history by the geographic location and complexity of the different European high mountain systems because (i) these species are now restricted to these mountain ranges and (in some cases) the arctic and (ii) most of their actual distribution areas were covered by extensive ice-shields during the glacial periods [5, 20]. In general, we can distinguish between several different distributional types in these mountain species. Thus, Varga and Schmitt  distinguish between five major patterns: (i) endemics of the Alps restricted to some parts or the entire range, (ii) the "Alpine archipelago" with the species' strongholds in the Alps and other parts of the range in adjoining mountain ranges, but without long distance disjunctions, (iii) mountain species with long distance disjunctions in Europe (e.g. in the mountains of the Balkan Peninsula, Italy or Iberia), (iv) oro-Mediterranean species with their ranges mostly restricted to the mountains of the summer-arid high mountain systems of southern Iberia, southern Italy and the southern Balkan Peninsula and (v) arctic-alpine species with a disjunction between mountain populations in the South (Alps, often also Pyrenees, Carpathians, Balkan high mountain systems) and a large zonal range in the Arctic.
Which repetitive biogeographical and evolutionary patterns are characteristic for European mountain species?
What is the influence of the climatic cycles on their differentiation?
Endemics of the Alps
Most of the larger European high mountain systems possess endemic species (or at least subspecies) confined to just one of them. As the Alps are by far the most extensive and highest mountain system of Europe, it is not surprising that the highest number and amount of endemics of typical high mountain species is found in this mountain range, as for example demonstrated by lepidopterans and especially in the little mobile group of the micro-moths . Some of these alpine endemics (in animals as well as in plants) are widespread all over this mountain area, stretching almost the entire range from Nice in the southwest to Vienna in the northeast (in many cases showing remarkable genetic substructure, see below); while others are more or less local endemics of some parts of the Alps.
Species with their ranges restricted to peripheral regions of the Alps and mostly confined to lower and intermediate elevations (e.g. observed in some Erebia species, Lycaenids etc.; for details see Varga & Schmitt ). The largest concentrations of these local endemics are in the regions of the southwestern and the southeastern Alps, two regions with larger areas at lower altitudes not covered by ice during glaciations. These ice-free areas most probably served as centres of glacial survival, from where these species only performed altitudinal shifts, but no major range expansions over large parts of the deglaciating Alps. As these taxa might have performed these altitudinal shifts repeatedly through the climatic fluctuations of the Pleistocene, these refuge areas might also be the locations of the evolutionary process of speciation . However, genetic analyses in this group of species are scarce and in butterflies restricted to the three taxa Coenonympha darwiniana , C. macromma  and Erebia sudetica inalpina (Figure 1) . The latter is today confined to the region of Grindelwald (Berner Oberland, northwestern Alps) and most probably survived at least the last glaciation in a geographically restricted refuge area northwest of the Alpine ice-shield, likely suffering population bottlenecks and subsequent genetic erosion . The two Coenonympha taxa are restricted to the south-central Alps (C. darwiniana) and the Alpes Maritimes (C. macromma). Both might have survived also at least the last ice age at lower elevations close to their recent distributions .
Species restricted to some parts of the Inner Alps, as for example a number of (often flightless) micro-moth species  and beetles , but only a single butterfly species (i.e. Erebia nivalis) . These species in general are confined to high alpine habitats and may have survived glaciations in situ at so called Nunataks (i.e. small ice-free areas topping over the ice-shield of the Inner Alps). For animals, survival in these areas is only supported by chorological data sets (i.e. distribution pattern) [5, 20], but genetic data in plants give some support for these refuges (see Schönswetter et al.  for a recent review, [34, 35]).
Endemics of other high mountain systems of Europe
Although the Alps are the European mountain system with the highest number of endemic species, numerous endemic genetic lineages or taxa are known for almost all high mountain systems in parts of Europe not entirely being covered by ice during the glacial periods. However, there are peculiar differences between the more marginal (e.g. Cantabrian Mts., Bulgarian Mts.) and more central (e.g. Carpathians, Massif Central, Apennines) mountain systems.
Another stronghold of strongly differentiated genetic lineages and endemic species is situated in the Bulgarian high mountain systems. Thus, the most distinct genetic lineages of the beetle Nebria rufescens and the butterfly Erebia pandrose, two arctic-alpine species, were found here ; a strongly differentiated genetic lineage was also found in the Proclossiana eunomia populations from the Stara Planina . In the spiders of the Pardosa saltuaria species group, the populations from the Bulgarian mountains, and also from the Pyrenees, showed a strong differentiation from a northern clade including the Alps, Carpathians, some middle high mountains of Central Europe and Scandinavia (Figure 3) . The caddisfly Drusus discolor also showed strongly differentiated genetic lineages for all of the marginal mountain systems of Europe where the taxon occurs, including the high mountain systems of Bulgaria (Figure 2) . Also plants in the Balkan high mountain systems showed strongly differentiated genetic lineages from other regions of Europe .
Furthermore, the distribution pattern of some species and subspecies strongly support these observed genetic structures. Thus, the eastern Balkan mountains are the only mountain range of the southern part of Europe where the fairly widespread mountain ringlet Erebia epiphron is lacking, but the species is substituted by its sister taxon Erebia orientalis supporting the strong evolutionary independence of this region. Regarding this latter species, each of the three mountain ranges harbouring it (i.e. Rila, Pirin, Stara Planina) has its own subspecies with strong morphological differentiations among them [45, 46]. A similar situation is also observed for the only occurrences of Euphydryas cynthia outside the Alps: the male individuals of the Pirin population consistently have a considerably more extended white wing colouration than average populations from the Alps, while the white colouration is strongly reduced in the Rila individuals . This also underlines the evolutionary independence among these mountain ranges of the eastern Balkan Peninsula on a fairly small geographic scale of sometimes only few tens of kilometres.
The Pyrenees have an intermediate position, in which they show some close connections to the Alps (see below), but also have numerous endemic species (e.g. in lepidopterans Erebia gorgone, three Sattleria species) [20, 49]; their number however is much lower than in the Alps, which are considerably higher and much more extended. Many mountain species with larger distributions show endemic lineages in the Pyrenees or parts of them, thereby supporting the idea of differentiation centres at the lower elevations of the Pyrenean area and recent (mostly postglacial) range shifts to higher altitudes of the mountains, as demonstrated for the butterflies Erebia epiphron (Figure 4) , Erebia euryale (Figure 5) , Erebia pandrose  and Erebia manto (unpublished data), but also other animal [41, 43] and plant species .
The summer-arid high mountain areas of the extreme south of Europe (especially southern Iberia and the southern Balkan Peninsula) and the Maghreb (here in particular the Atlas Mts.) do not have the typical alpine zonation , but show typical oro-Mediterranean characteristics. Some mountain species show local endemism to strongly confined mountain blocks in this area as e.g. known for a number of butterfly species [20, 45, 49]. These species in many cases represent relicts of often old invasions of species with their closed biogeographical connections to Central Asia [20, 53, 54].
The large high mountain systems of the southern part of Europe (i.e. Pyrenees, Alps and Carpathians) have in many cases been colonised after the postglacial deglaciation by several genetic lineages, which have survived at least the last glacial period in several allopatric refugial areas often adjoining these high mountain systems.
Different genetic lineages in the Alps
Different genetic lineages in the Pyrenees
As in the Alps, more than one genetic lineage per species is also observed in mountain elements of the Pyrenees . However, the Pyrenees are considerably less extended than the Alps, and the maximum number of different lineages found here is not as high as in the Alps; many species do not show marked differentiation over the Pyrenees. As an example, two different lineages are observed in the Pyrenees for Erebia epiphron (Figure 4), one in the western and the other in the eastern parts of these mountains, with the first one most probably surviving the last ice age north and the second in the southeastern parts of the Pyrenees . Also for the plant Cardamine alpina, AFLP patterns suggest survival in multiple Pyrenean refugia .
Different genetic lineages in the Carpathians
Although being the largest high mountain system of eastern/southeastern Europe, only a few genetic analyses include populations from more than one part of the Carpathian arc. However, compiling existing data for different plant species revealed a generally lower genetic diversity of the populations in the Carpathians than in the Alps, maybe due to higher topographic isolation of alpine habitats in the Carpathians .
One study on animals that included a considerable number of samples from the Carpathian region was performed on the caddisfly Drusus discolor and showed a remarkable differentiation between the northwestern and the southern Carpathians (Figure 2). This thus supports the idea of a long lasting separation between these two parts of this high mountain system predating at least the last glaciation . Similar cases are also reported for plants as Hypochaeris uniflora  and Campanula alpina .
Thus, multiple glacial survival centres exist along the Carpathian arc, as in the cases of the Pyrenees and especially Alps, but the number of known cases is still rather limited. Therefore, a research focus on the phylogeography of the Carpathians is needed.
The middle high mountain systems of Europe show numerous biogeographical connections with the high mountain systems and among each other. Thus, the French Massif Central shows strong connections with the Pyrenees in many cases, e.g. by having the same melanistic subspecies Erebia manto constans  as well as showing rather weak genetic differentiation in Parnassius apollo  and Pulsatilla vernalis . However, in other cases, close connections exist between the Massif Central and the Alps, as in the plant Polygonatum verticillatum . However, the populations of the Massif Central are detected as even an independent phylogeographic group, as in the case of the caddisfly Drusus discolor (Figure 2) .
Links with the Alps are known for the Bavarian and Bohemian Forest, e.g. by sharing the eastern Alpine lineage in the caddisfly Drusus discolor (Figure 2) , and for the Jesenik mountains in northern Moravia, e.g. by striking genetic similarities with northern Alps E. epiphron populations (Figure 4) . Relicts of alpine species in the Vosges and (to a lesser degree) in the Black Forest (e.g. in butterflies Erebia epiphron, E. manto, Clossiana titania, C. thore)  underline their close biogeographical relation with the Alps, which is also supported by genetic studies e.g. in the plant Polygonatum verticillatum . In Pulsatilla vernalis, Tatra and Sudeten Mts. share the same chloroplast haplotype indicating a close link between these two mountain ranges for this species, but isolation from the Alps . These patterns are most likely due to glacial refuge areas in the vicinity of the Alps, Carpathians or Pyrenees and postglacial retreat into one of these high mountain systems, but also into at least one of the adjoining middle high mountain systems with not sufficient time for differentiation since then.
The topology of the European mountain systems had a strong influence on the biogeography and evolution of mountain and high latitude species. Due to the dynamic changes of these biota over time, a large variety of different evolutionary processes are responsible for the development of numerous biogeographical patterns. The most simple of these is the evolution of one genetic lineage or species endemic to one single mountain system due to vicariance with subsequent long processes of geographic isolation and evolution, as observed in almost all European high mountain systems. Especially in the Alps, but also in smaller high mountain systems, different genetic lineages exist beside each other as a result of evolution in geographically isolated areas, with often secondary contacts in these mountain systems. Where such centres of evolution and differentiation of lineages were located between two mountain systems, retraction during the postglacial into both of them is commonly resulting in one genetic lineage being found in two different mountain systems.
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