Open Access

Table 2

Density of amphibian tail fin, and conversion into the fin surface required to produce 100 μg of freeze-dried matter (i.e. the minimum mass required for nitrogen-rich biological material for stable isotope measurements).

Species Number of individuals Freeze-dried matter density (µg mm−2) Fin surface required (mm−2)


  (fin samples) Mean ± SD Range Mean ± SD Range
Agile frog 17 (62) 13.7 ± 4.7 6.9–22.7 9.0 ± 2.8 5.5–16.7
European tree frog 10 (39) 7.9 ± 2.4 5.1–12.4 14.4 ± 4.1 9.0–20.8
Marbled newt 29 (139) 55.3 ± 9.1 23.1–89.4 2.0 ± 0.4 1.0–4.4
Palmate newt 7 (23) 37.7 ± 4.2 25.4–62.2 3.0 ± 0.2 1.8–4.0

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.