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2013 ; 3
(2
): 475-98
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GeoBioScience: Red Wood Ants as Bioindicators for Active Tectonic Fault Systems
in the West Eifel (Germany)
#MMPMID26487413
Berberich G
; Schreiber U
Animals (Basel)
2013[May]; 3
(2
): 475-98
PMID26487413
show ga
In a 1.140 km² study area of the volcanic West Eifel, a comprehensive
investigation established the correlation between red wood ant mound (RWA;
Formica rufa-group) sites and active tectonic faults. The current stress field
with a NW-SE-trending main stress direction opens pathways for geogenic gases and
potential magmas following the same orientation. At the same time, Variscan and
Mesozoic fault zones are reactivated. The results showed linear alignments and
clusters of approx. 3,000 RWA mounds. While linear mound distribution correlate
with strike-slip fault systems documented by quartz and ore veins and fault
planes with slickensides, the clusters represent crosscut zones of dominant fault
systems. Latter can be correlated with voids caused by crustal block rotation.
Gas analyses from soil air, mineral springs and mofettes (CO?, Helium, Radon and
H?S) reveal limiting concentrations for the spatial distribution of mounds and
colonization. Striking is further the almost complete absence of RWA mounds in
the core area of the Quaternary volcanic field. A possible cause can be found in
occasionally occurring H?S in the fault systems, which is toxic at miniscule
concentrations to the ants. Viewed overall, there is a strong relationship
between RWA mounds and active tectonics in the West Eifel.