Table S1: Straight carapace length SCL (cm), straight carapace width SCW (cm) and body mass (g) of the turtles in September 2010 (time of purchase; n=140) and in March 2011 (beginning of the feeding trial; n= 126).

Data are given as mean ± standard error, min-max values.

Estimated age of the turtles (months) / SCL (cm) / SCW (cm) / Body mass (g)
One month
(n=140) / 3.5± 0.1
3.1 - 4.1 / 3.5± 0.1
3.0–4.0 / 9.1 ± 0.1
6.2 - 13.3
Seven months
(n=126) / 5.4± 0.1
4.3 – 6.8 / 5.4±0.1
4.3 - 6.7 / 36.5 ± 0.7
16.7 - 53.8

Table S2: Straight carapace length SCL (cm), straight carapace width SCW (cm) and body mass (g) of the turtleseuthanized 8 weeks after the beginning of the feeding trial (end of the Se exposure) in control and Se-exposed groups (SeMet1 and SeMet 2)

Data are given as mean ± standard error, min-max values. n = 6 for each group.

Control / SeMet1 / SeMet2
SCL (cm) / 6.0±1.5
5.8 - 6.7 / 5.8±0.2
5.3 - 6.2 / 6.0±0.2
5.5 - 6.9
SCW (cm) / 5.6±0.1
5.3 - 6.1 / 5.4±0.1
5.2 - 5.8 / 5.7±0.1
5.2 - 6.0
Body Mass (g) / 49.4±2.6
40.3 - 61.0 / 47.3±2.1
35.3 - 59.3 / 45.3±1.9
41.3 - 51.4

Table S3: Straight carapace length SCL (cm), straight carapace width SCW (cm) and body mass (g) of the turtleseuthanized 12 weeks after the beginning of the feeding trial (end of the Se exposure) in control and Se-exposed groups (SeMet1 and SeMet 2)

Data are given as mean ± standard error, min-max values. n = 6 for each group.

Control / SeMet1 / SeMet2
SCL (cm) / 5.5±0.3
4.8 - 7.0 / 6.2±0.4
5.2 - 7.3 / 6.5±0.4
5.3 - 7.7
SCW (cm) / 5.3±0.3
4.6 - 6.5 / 5.8±0.3
5.1 - 6.4 / 6.1±0.3
5.3 - 6.7
Body mas (g) / 38.4±4.0
28.0 - 62.2 / 50.9±4.3
31.5 - 69.2 / 57.0±6.5
34 - 83