I am looking for literature that deals with amphibians in urban areas. Are there studies on threshod values for toxological substances at which amphibians are no longer able to survive? Which species are more sensitive which are less? For example, at what concentration are acidification and contamination by heavy metals such as cadmium, copper, lead and zinc a problem? What about pharmaceuticals and pesticides? There are a lot of studies for non-urban areas, are the results transferable?
Studies in German are very welcome.
There is a review, but I think it‘s not sufficient for answering this specific question:
Toxicological Threats to Amphibians and Reptiles in Urban Environments (2008)
Maxine C. Croteau, Natacha Hogan, Jennifer C. Gibson, David Lean, and Vance L. Trudeau, In: J.C. Mitchell, R.E. Jung Brown, and B. Bartholomew (editors). Urban Herpetology. Herpetological Conservation 3: 197–209
A partial answer can be extrapolated from the text of this great work.
https://doi.org/10.2903/j.efsa.2018.5125
I have done herpetological surveys in several urban areas, most notably in Milwaukee, Wisconsin (USA). Several species are highly tolerant to heavy metal contamination such as Family Ranidae; Lithobates clamitans, L. catesbeiana, L. pipiens, Family Bufonidae; Anaxyrus americanus. Treefrogs (Hylidae) were less tolerant and more common near the periphery of the city (Psuedacris crucifer, Hyla versicolor). See attached report.
(PDF) Milwaukee Estuary Area of Concern Wildlife Population Assessment Report (researchgate.net)
Urea is a big problem for many species, especially for the larvae during the stage when they got external gills. At a concentration where adult individuals still survive, they will not be able to multiply.
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