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Scientific field report

Potential large carnivore movement corridor in the Ämpächli sector

Corridor potentiel de déplacement d’un grand carnivore dans le secteur d’Ämpächli

Potenzieller Bewegungskorridor für Grossraubtiere im Sektor Ämpächli

Potenziale corridoio di spostamento per grandi carnivori nel settore di Ämpächli

A cautious field-based assessment from the Sernftal Valley, Canton of Glarus, combining indirect large canid-compatible signs, ungulate remains, and topographic corridor interpretation.

Ämpächli / Sernftal Field signs No genetic confirmation

A potential corridor between alpine pasture and montane forest

Background

The Ämpächli sector above Elm forms a transition zone between open alpine pasture, slope breaks, and montane forest within the broader Sernftal landscape.

Objective

To assess whether field-readable landscape features and indirect signs are compatible with use by large carnivores, especially wolves, while avoiding unsupported species confirmation.

Methods

Three days of non-invasive field survey across approximately 6.7 km² combined topographic reading, indirect sign documentation, photographic evidence, and regional ecological context.

Results

Large canid-compatible scats with hair and bone fragments, wild ungulate remains, and a coherent linear arrangement of signs were recorded along a natural descent axis.

Conclusion

The evidence supports a cautious interpretation of Ämpächli as a potential large carnivore-compatible movement corridor, but species-level confirmation requires genetic sampling, camera traps, or repeated long-term monitoring.

Wolf recovery, the Kärpf pack, and the Grossraum Elm

The recovery of the wolf in the Swiss Alps is a dynamic ecological process and a sensitive social issue, particularly in valleys where wildlife movement, livestock husbandry, tourism, and mountain infrastructure intersect. In the Canton of Glarus, the Kärpf pack has been publicly documented in the Grossraum Elm, with reproduction confirmed in 2025 through the observation of three pups by the cantonal game wardens.

Against this regional background, a local reading of Ämpächli is relevant because corridors are not only broad cartographic concepts. They are also made of concrete terrain features: ridges, slope breaks, forest edges, funnels, quiet zones, and passages where animal movement becomes more likely.

Ämpächli as a structured Alpine transition zone

The surveyed area covers approximately 4 km² above the Sernftal Valley near Elm, Glarus. The site includes exposed alpine ridges and pastures, slope breaks, natural descent lines, and lower montane forest patches. This sequence forms a topographic gradient that may concentrate movement between open feeding areas and sheltered cover.

Seasonal disturbance appears locally reduced during certain periods because of access restrictions, closed infrastructure, and the absence of major hiking routes to prominent summits. Such conditions may increase the value of the area as a nocturnal or low-disturbance movement zone for wild ungulates and carnivores.

Non-invasive field reading and indirect sign survey

Fieldwork was conducted over three days using a non-invasive, multi-layered approach. The survey combined four complementary components:

  • Topographic reading: identification of slopes, ridgelines, forest edges, funnels, bottlenecks, and likely movement axes.
  • Indirect sign survey: search for scats, tracks, prey remains, marking sites, and other field-readable indicators.
  • Photographic documentation: visual recording of relevant signs, including scale where available.
  • Spatial mapping: comparison of sign positions with terrain features to assess linearity and possible corridor function.
Methodological boundary: no genetic sampling was performed. All interpretations therefore remain provisional and must be treated as hypotheses rather than confirmation.

Indirect signs compatible with large canid activity

Several scats morphologically compatible with large canids were recorded along a coherent topographic axis. They showed an elongated and twisted form, high hair content, visible bone fragments, and placement on exposed relief points. Such features may be consistent with territorial marking behavior in wild canids, but they are not diagnostic without genetic analysis.

In adjacent forest patches, wild ungulate remains were documented, including a chamois skull and red deer antler fragments. These remains may result from natural mortality, predation, or scavenging. No direct diagnostic evidence allows attribution to a specific predator.

Large canid-compatible scat with visible hair content and scale bar
Figure 1. Large canid-compatible scat documented in the Ämpächli sector. The presence of hair and bone fragments supports a carnivore-compatible interpretation, but species confirmation is not possible without DNA analysis.
Wild ungulate remains documented in forest habitat
Figure 2. Wild ungulate remains in adjacent forest habitat: chamois skull (A) and red deer bone fragments (B). These observations do not by themselves identify the predator or cause of death.

A linear arrangement along a natural descent axis

The recorded signs were not randomly dispersed. They followed a coherent sequence from the upper Ämpächli ridge and forest-pasture ecotone downwards toward a lower forest zone. This pattern is consistent with a natural movement corridor that could be used by wild ungulates, foxes, lynx, and wolves.

The interpretation remains ecological and spatial rather than taxonomic. The corridor hypothesis is based on the alignment of signs, the relief structure, and the functional relationship between open pasture and forest cover.

Schematic wildlife waypoint ecological analysis map for Ämpächli
Figure 3. Schematic ecological waypoint analysis showing the spatial relation between signs, prey-compatible records, forest structure, and a potential predator-prey corridor overlap. This is an interpretive field diagram, not an official GIS product.

Corridor compatibility, not species confirmation

The combination of large canid-compatible scat morphology, prey remains, and coherent topographic alignment supports the hypothesis that Ämpächli may function as a movement corridor for large carnivores within the broader Kärpf pack landscape. The sector contains several features compatible with Alpine carnivore movement: compartmentalized relief, discontinuous forest cover, available wild ungulates, and reduced disturbance during certain periods.

Nevertheless, the observations remain preliminary. Scat morphology can overlap between wolves and large domestic dogs, prey remains can result from multiple processes, and a three-day survey cannot establish regularity of use. The scientific value of the report lies in making a cautious, falsifiable hypothesis visible.

Why caution is essential

LimitationConsequenceNeeded follow-up
No genetic sampleSpecies-level confirmation is impossible.DNA analysis from fresh scat, hair, saliva, or other suitable material.
No camera-trap confirmationNo direct visual record of the responsible species.Targeted camera-trapping along the corridor axis.
Short survey durationRegularity of use cannot be evaluated.Repeated surveys across seasons and snow conditions.
Alternative explanationsDomestic dog activity, scavenging, or natural mortality cannot be excluded.Combined sign, genetic, and photographic monitoring.

From provisional interpretation to stronger evidence

Genetic monitoring

Collect fresh scat or hair samples following appropriate protocols and submit them for laboratory analysis.

Camera-trapping

Place cameras along the ridge-to-forest descent axis to test repeated use by large carnivores and ungulates.

Seasonal repetition

Repeat surveys during snow, low-disturbance, and vegetation periods to assess whether use is occasional or recurrent.

A functional landscape hypothesis worth monitoring

The Ämpächli sector exhibits several elements compatible with large carnivore movement in an Alpine transition landscape: a ridge-to-forest topographic sequence, large canid-compatible signs, wild ungulate remains, and a coherent spatial arrangement. These observations support a cautious corridor hypothesis rather than a species-level confirmation.

For NATURASCHUTZ.CH, the value of this report lies in connecting local field observation with transparent scientific caution. The next step is not to overstate the evidence, but to transform the hypothesis into a structured monitoring protocol capable of confirming, refining, or rejecting the interpretation.

References

  1. Kanton Glarus. Welpen beim Kärpfrudel nachgewiesen. Public newsroom, 4 September 2025.
  2. Kanton Glarus. Grossraubtiere — News and information page.
  3. KORA. What is monitoring?
  4. KORA. Genetics in large carnivore monitoring.
  5. KORA. Wolf distribution records in Switzerland.
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