Changes in biodiversity and vegetation composition in the central Swiss Alps during the transition from pristine forest to first farming

Aim: We investigate the response of vegetation composition and plant diversity to increasing land clearance, burning and agriculture at the Mesolithic–Neolithic transition (c. 6400–5000 bc) when first farming was introduced. Location: The Valais, a dry alpine valley in Switzerland. Methods: We combine high-resolution pollen, microscopic charcoal and sedimentological data to reconstruct past vegetation, fire and land use. Pollen evenness, rarefaction-based and accumulation-based palynological richness analyses were used to reconstruct past trends in plant diversity. Results: Our results show that from c. 5500 cal. yr bc, slash-and-burn activities created a more open landscape for agriculture, at the expense of Pinus and Betula forests. Land clearance by slash-and-burn promoted diverse grassland ecosystems, while on the long term it reduced woodland and forest diversity, affecting important tree species such as Ulmus and Tilia. Main conclusions: Understanding the resilience of Alpine ecosystems to past disturbance variability is relevant for future nature conservation plans. Our study suggests that forecasted land abandonment in the Alps will lead to pre-Neolithic conditions, with significant biodiversity losses in abandoned grassland ecosystems. Thus, management measures for biodiversity, such as ecological compensation areas, are needed in agricultural landscapes with a millennial history of human impact, such as the non-boreal European lowlands. Our study supports the hypothesis that species coexistence is maximized at an intermediate level of disturbances. For instance, species richness decreased when fire exceeded the quasi-natural variability observed during the Mesolithic times. Under a more natural disturbance regime, rather closed Pinus sylvestris and mixed oak forests would prevail.

The extreme flood event of Lago Maggiore in September 1993

In September 1993, the Valais and Ticino regions of Switzerland were affected by extreme flooding triggered by heavy precipitation. The meteorological situation leading to this event is studied in the Twentieth Century Reanalysis (20CR) data set. A strong cut-off low development is found to be the driving synoptic-scale atmospheric circulation pattern. The agreement with previous studies highlights the applicability of 20CR for extreme event analysis.

Archaeological Discoveries on Schnidejoch and at Other Ice Sites in the European Alps

Only a few sites in the Alps have produced archaeological finds from melting ice. To date, prehistoric finds from four sites dating from the Neolithic period, the Bronze Age, and the Iron Age have been recovered from small ice patches (Schnidejoch, Lötschenpass, Tisenjoch, and Gemsbichl/Rieserferner). Glaciers, on the other hand, have yielded historic finds and frozen human remains that are not more than a few hundred years old (three glacier mummies from the 16th to the 19th century and military finds from World Wars I and II). Between 2003 and 2010, numerous archaeological finds were recovered from a melting ice patch on the Schnidejoch in the Bernese Alps (Cantons of Berne and Valais, Switzerland). These finds date from the Neolithic period, the Early Bronze Age, the Iron Age, Roman times, and the Middle Ages, spanning a period of 6000 years. The Schnidejoch, at an altitude of 2756 m asl, is a pass in the Wildhorn region of the western Bernese Alps. It has yielded some of the earliest evidence of Neolithic human activity at high altitude in the Alps. The abundant assemblage of finds contains a number of unique artifacts, mainly from organic materials like leather, wood, bark, and fibers. The site clearly proves access to high-mountain areas as early as the 5th millennium BC, and the chronological distribution of the finds indicates that the Schnidejoch pass was used mainly during periods when glaciers were retreating.

Auswirkungen der Klimaänderung auf die schweizerische Wasserkraftnutzung

Hydraulic power contributes for a large part to electricity production in Switzerland. However, hydropower could be strongly affected by climate change. For that reason, the project CCWasserkraft – which results are summarised here – has been launched. In different studies, important aspects of the interactions between climate, hydrology and hydropower were investigated. Comprehensive simulations in representative catchments allowed quantifying the impacts of climate change on discharge and hydropower production. Finally, the results were extrapolated to whole Switzerland. The results show that significant changes are likely in the near future 2021–2050: an increase of hydropower production is projected for the winter half year, whereas stagnation or a decrease is expected in the summer half year. On the whole, the yearly hydropower production should remain constant or could even increase slightly. Projections for 2070–2099 remain uncertain. However, hydropower production from highly glaciated catchments located in southern and eastern Valais as well as catchments south of the Alps is expected to decline.

Occurrence of congenital disorders in Swiss sheep.

BACKGROUND The rates of congenital disorders in Swiss sheep were determined by a questionnaire which was sent to 3,183 members of the Swiss Sheep Breeders' Association. FINDINGS A total of 993 questionnaires were returned, giving a response rate of 31.2%. Of these, 862 questionnaires originated from farms keeping one of the predominant Swiss sheep breeds: Swiss White Alpine sheep, Brown-Headed Meat sheep, Swiss Black Brown Mountain sheep and Valais Blacknose sheep. During a 10-year-period, entropion was reported in 33.6% of the farms, brachygnathia inferior in 29.5%, abdominal/umbilical hernia in 15.9%, cryptorchidism in 10.5% and torticollis in 10.5%. The most significant difference between the four breeds (P<0.001) occurred for entropion in Swiss White Alpine sheep and Brown-Headed Meat sheep, brachygnathia inferior in Swiss Black Brown Mountain sheep, and scrotal/inguinal hernia in Valais Blacknose sheep. The Swiss White Alpine breed showed a significantly higher animal prevalence of entropion (6.2% in 2011 and 5.5% in 2012) than other breeds (P<0.001). CONCLUSIONS These findings indicate a breed-specific necessity for action, particularly regarding Swiss animal welfare legislation, especially entropion in Swiss White Alpine sheep is concerned. In general, careful selection of breeding stock is to be recommended.

Schnideoch, Alpes Bernoises, 2756 m: Découvertes archéologiques dans la glace du Néolithique au Haut Moyen Âge

Depuis que les glaciers fondent, la glace libère des objets hautement intéressants. C’est ainsi qu’en été 2003 une promeneuse a ramassé un objet qui a été remis au Service archéologique du canton de Berne. La datation au C14 révéla qu’il s’agit d’un fragment de carquois en écorce de bouleau datant du Néolithique Final. Depuis l’été 2004, le Service archéologique du canton de Berne étudie le site du Schnidejoch,un col situé à 2756 mètres d’altitude entre l’Oberland bernois et le Valais, et a ainsi pu récolter plus de 300 objets . L’éventail des objets découverts s’étend de bouts de vêtements préhistoriques en cuir et raphia à des épingles en bronze et des clous de souliers romains en passant par un carquois et des flèches. Les découvertes du Schnidejoch sont les plus anciennes du genre jamais faites dans les Alpes.

The brown coat colour of Coppernecked goats is associated with a non-synonymous variant at the TYRP1 locus on chromosome 8

The recent development of a goat SNP genotyping microarray enables genome-wide association studies in this important livestock species. We investigated the genetic basis of the black and brown coat colour in Valais Blacknecked and Coppernecked goats. A genome-wide association analysis using goat SNP50 BeadChip genotypes of 22 cases and 23 controls allowed us to map the locus for the brown coat colour to goat chromosome 8. The TYRP1 gene is located within the associated chromosomal region, and TYRP1 variants cause similar coat colour phenotypes in different species. We thus considered TYRP1 as a strong positional and functional candidate. We resequenced the caprine TYRP1 gene by Sanger and Illumina sequencing and identified two non-synonymous variants, p.Ile478Thr and p.Gly496Asp, that might have a functional impact on the TYRP1 protein. However, based on the obtained pedigree and genotype data, the brown coat colour in these goats is not due to a single recessive loss-of-function allele. Surprisingly, the genotype distribution and the pedigree data suggest that the (496) Asp allele might possibly act in a dominant manner. The (496) Asp allele was present in 77 of 81 investigated Coppernecked goats and did not occur in black goats. This strongly suggests heterogeneity underlying the brown coat colour in Coppernecked goats. Functional experiments or targeted matings will be required to verify the unexpected preliminary findings.

Fine-scale population structure analysis of seven local Swiss sheep breeds using genome-wide SNP data

As part of the global sheep Hapmap project, 24 individuals from each of seven indigenous Swiss sheep breeds (Bundner Oberländer sheep (BOS), Engadine Red sheep (ERS), Swiss Black-Brown Mountain sheep (SBS), Swiss Mirror sheep (SMS), Swiss White Alpine (SWA) sheep, Valais Blacknose sheep (VBS) and Valais Red sheep (VRS)), were genotyped using Illumina’s Ovine SNP50 BeadChip. In total, 167 animals were subjected to a detailed analysis for genetic diversity using 45 193 informative single nucleotide polymorphisms. The results of the phylogenetic analyses supported the known proximity between populations such as VBS and VRS or SMS and SWA. Average genomic relatedness within a breed was found to be 12 percent (BOS), 5 percent (ERS), 9 percent (SBS), 10 percent (SMS), 9 percent (SWA), 12 percent (VBS) and 20 percent (VRS). Furthermore, genomic relationships between breeds were found for single individuals from SWA and SMS, VRS and VBS as well as VRS and BOS. In addition, seven out of 40 indicated parent–offspring pairs could not be confirmed. These results were further supported by results from the genome-wide population cluster analysis. This study provides a better understanding of fine-scale population structures within and between Swiss sheep breeds. This relevant information will help to increase the conservation activities of the local Swiss sheep breeds.

Experimental evidence for the immediate impact of fertilization and irrigation upon the plant and invertebrate communities of mountain grasslands

The response of montane and subalpine hay meadow plant and arthropod communities to the application of liquid manure and aerial irrigation – two novel, rapidly spreading management practices – remains poorly understood, which hampers the formulation of best practice management recommendations for both hay production and biodiversity preservation. In these nutrient-poor mountain grasslands, a moderate management regime could enhance overall conditions for biodiversity. This study experimentally assessed, at the site scale, among low-input montane and subalpine meadows, the short-term effects (1 year) of a moderate intensification (slurry fertilization: 26.7–53.3 kg N·ha−1·year−1; irrigation with sprinklers: 20 mm·week−1; singly or combined together) on plant species richness, vegetation structure, hay production, and arthropod abundance and biomass in the inner European Alps (Valais, SW Switzerland). Results show that (1) montane and subalpine hay meadow ecological communities respond very rapidly to an intensification of management practices; (2) on a short-term basis, a moderate intensification of very low-input hay meadows has positive effects on plant species richness, vegetation structure, hay production, and arthropod abundance and biomass; (3) vegetation structure is likely to be the key factor limiting arthropod abundance and biomass. Our ongoing experiments will in the longer term identify which level of management intensity achieves an optimal balance between biodiversity and hay production.

Schnidejoch und Lötschenpass. Archäologische Forschungen in den Berner Alpen. Schnidejoch et Lötschenpass. Investigations archéologiques dans les Alpes bernoises.

Archäologie in den Hochalpen: Vom Rückgang der Gletscher sind auch archäologische Objekte betroffen. Über Jahrtausende hinweg haben sie im Eis überdauert, nun kommen sie zum Vorschein. Im Hitzesommer 2003 fand eine Wanderin am Schnidejoch ein fremdartiges Objekt aus Birkenrinde. Es erwies sich als Teil eines 4800 Jahre alten Bogenfutterals. In den Jahren 2004 bis 2011 unternahm der Archäologische Dienst des Kantons Bern über 30 Begehungen der Nordseite und – zusammen mit der Walliser Kantonsarchäologie – auch der Südseite des Schnidejochs. Zahlreiche weitere Funde aus Holz, Leder und Metall konnten geborgen und wissenschaftlich untersucht werden. Einzigartige Funde Zu den spektakulärsten Funden vom Schnidejoch zählt das Bogenfutteral aus Birkenrinde. Weiter stechen aus den rund 900 Funden ein Pfeilbogen, mehrere vollständige Pfeile und Fragmente einer Schale aus Ulmenholz hervor. Es handelt sich dabei um das älteste Holzgefäss der Schweiz. Weitere herausragende Funde sind ein bronzezeitliches Holzgefäss aus Birkenrinde, eine bronzezeitliche Gewandnadel sowie Bekleidung und Schuhe aus Leder. Archéologie dans les Alpes bernoises Le recul des glaciers a aussi un impact sur les découvertes archéologiques. Il fait réapparaître des objets préservés dans les glaces depuis des millénaires. Pendant l’été caniculaire de 2003, une randonneuse a découvert un objet singulier en écorce de bouleau, qui s’est avéré être un morceau de carquois vieux de 4800 ans. De 2004 à 2011, le Service archéologique du canton de Berne s’est rendu plus de trente fois sur le versant nord du Schnidejoch et, en collaboration avec le Service d’archéologie du canton du Valais, sur le versant sud de ce col. De nombreux autres objets en bois, cuir et métal ont pu être mis au jour et étudiés scientifiquement. Des découvertes uniques Le carquois en écorce de bouleau constitue l’une des découvertes les plus sensationnelles du Schnidejoch. Parmi les quelque 900 objets mis au jour figurent un arc, plusieurs flèches complètes et les fragments d’un bol en bois d’orme. Ce bol est le plus ancien récipient en bois de Suisse. D’autres trouvailles spectaculaires ont été faites, notamment un récipient en écorce de bouleau et une épingle à vêtements datant de l’Âge du Bronze ainsi que des vêtements et des chaussures en cuir.

Material culture entanglements of early wetland sites in central Switzerland (4300-3850 BC)

In central Switzerland, the earliest wetland settlements with definitely attested finds and features date into the second half of the 5th millennium BC. Combining the information they have yielded with that from dryland sites, we can construct a detailed picture of material culture at the turn of the 5th to the 4th millennium. On this basis, the definition of clearly delimited archaeological cultures seems questionable, not only from a theoretical point of view. Similiarities and differences in the pottery show small-scale regional units defined via vessel forms as well as stylistic and technological aspects. Yet there are also inter-regional connections: roundbased vessels with opposing handles are typical for Lake Zurich, central and western Switzerland, the Valais and the central Rhône valley. In turn, ‘foreign‘ types such as shoulder-band beakers indicate regular connections between groups living in central Switzerland and those in Alsace and southern Germany. Are these beakers ‘imports‘ or locally produced items (‘imitations‘) indicating the adoption of ‘foreign‘ vessel types and concepts? This and similar material culture phenomena result in a picture of many material entanglements and problematise the kinds of relationships and mobility which might have existed. Our paper addresses these questions and discusses how and whether these interwoven connections changed in the early 4th millennium.

Days spent in acute care hospitals at the end of life of cancer patients in four Swiss cantons: a retrospective database study (SAKK 89/09).

Number of days spent in acute hospitals (DAH) at the end of life is regarded as an important care quality indicator for cancer patients. We analysed DAH during 90 days prior to death in patients from four Swiss cantons. Claims data from an insurance provider with about 20% market share and patient record review identified 2086 patients as dying of cancer. We calculated total DAH per patient. Multivariable generalised linear modelling served to evaluate potential explanatory variables. Mean DAH was 26 days. In the multivariable model, using complementary and alternative medicine (DAH = 33.9; +8.8 days compared to non-users) and canton of residence (for patient receiving anti-cancer therapy, Zürich DAH = 22.8 versus Basel DAH = 31.4; for other patients, Valais DAH = 22.7 versus Ticino DAH = 33.7) had the strongest influence. Age at death and days spent in other institutions were additional significant predictors. DAH during the last 90 days of life of cancer patients from four Swiss cantons is high compared to most other countries. Several factors influence DAH. Resulting differences are likely to have financial impact, as DAH is a major cost driver for end-of-life care. Whether they are supply- or demand-driven and whether patients would prefer fewer days in hospital remains to be established.

Unravelling the moisture sources of the Alpine Glaciers using tunnel valleys as constraints

A lack of archives has impeded reconstructions of moisture pathways for past glaciations in the European Alps. Here, we focus on the confluence area of two palaeoglaciers in the Swiss Plateau that were sourced on the northern (Aare glacier) and southern sides (Valais glacier) of the European Alps. We mapped tunnel valleys in the region using a drilling database, based on which we inferred the relative extent of each glacier c. 270 ka ago when the valleys were formed. We then compared this situation with that of the LGM. We found that, while the Valais glacier expanded farther into the foreland than the Aare glacier during the LGM, the opposite was the case c. 270 ka ago. We also found that LGM glaciers were non-erosive in the distal foreland. These contrasts in extents and erosional efficiencies imply differences in moisture pathways between the LGM and the time when the tunnel valleys were formed.