Figure 3.

Relationship between two features of embryonic oviposition, (a–c) proportion of eggs shaded and (d–f) mean depth of eggs, at breeding sites of (a,d) AMMA, (b,e) AMGR and (c,f) RACA across a range of water transparency to UV-B (percentage surface UV-B at 10 cm water depth). A greater proportion of AMMA embryos are shaded from ambient light with increasing water transparency to $\text{UV‐B}(a\text{sin}\sqrt{P_{\text{shaded}}}=0.738a\text{sin}\sqrt{P_{\text{UV‐B}}}+0.173,r^2=0.50,p<0.001)$, and the average depth (cm) of AMGR eggs in the water column increases with increasing water transparency to $\text{UV‐B}{(\text{depth}}_{\text{eggs}}=0.017a\text{sin}\sqrt{P_{\text{UV‐B}}}-0.024,r^2=0.71,p<0.005)$. No other relationships were found to be statistically significant with α=0.05. Transmission of surface UV-B through the water column is determined by the diffuse attenuation coefficient (K_d) for UV-B wavelengths (290–320 nm), estimated by the absorption of 440 nm light in a spectrophotometer.