The Acta GGM Debrecina

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Title Tracing prey-predatory interactions in the Early Sarmatian (Mid-Miocene) shelly community from Rollsdorf Formation, Waldhof, Austria based on bioerosional observations
Author Agnes Zagyvai, Gabor Demeter
The investigation focuses on the distribution of drill-holes made by predatory organisms on mollusc shells, identifying the most common prey taxa, the ocation and shape of drillings and the preferences of potential predators in selecting the site of drilling. These observations make possible to trace the potential predators. The examined shells from the Rollsdorf Formation (Waldhof, Austria)represent an Early Sarmatian endemic epifaunal gastropod community in the western periphery of the Central Paratethys after the Badenian/Sarmatian extinction. To trace the most common prey around 3000 randomly selected specimens of  Potamides gamlitzensis, Mohrensternia, Hydrobia frauenfeldi, Neritina picta and Acteocina lajonkaireana were examined giving a good outlook on the reduced diversity and abundance in the community after the environmental conditions had changed. Based on analogies dominant gastropod predator could be 
the survived epibenthic Muricid. However, the shape and the location of drill-holes partly contradict the assumption that only a Muricid predator could cause these deformations because the observed drill-holes on the Sarmatian epibenthic gastropod community show variety from nearly perfect circle to ellipsoid. Other circumstances suggest the activity of Polychaeta worms and Acteocina species as possible attackers. Results also show that the site of attack is not randomly selected. The most commonly chosen area in prey shells is the fifth sector, which is at angles 0°–90° on the second whorl. Thus, these drill-holes cannot be connected unambiguously to the activity of worms.  
Keywords Central Paratethys, Sarmatian, drill-holes, Muricid, Polychaeta, Acteocina, site-selectivity
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