Table 1.

Effect of behavior and DOM on estimates of UV-B risk

Species	Scenario	> High threshold	> Low threshold
A. macrodactylum
	Actual conditions	1.1%	11.2%
	No behavior, actual DOM	18.9%	37.9%
	Actual behavior, constant DOM*	56.2%	56.3%
	No behavior, constant DOM*	99.4%	100%
R. cascadae
	Actual conditions	0%	5.7%
	Constant DOM†	0%	7.7%

The percentage of embryos exposed to UV-B (KJ·m⁻²) exceeding high and low thresholds determined experimentally for each species: for A. macrodactylum, high =10,534 KJ·m⁻², low = 5,321 KJ·m⁻²; for R. cascadae, high = 22,918 KJ·m⁻², low = 10,534 KJ·m⁻². Scenarios represent calculations of risk based on actual observed conditions, including behavior and landscape variation in DOM, or assumptions of constant DOM across all sites (most transparent site for each species:

*K_d = 0.00037;

^†K_d= 0.00897) or of no behavioral response to UV-B exposure (all embryos classified as “exposed”). R. cascadae exhibited no variation in oviposition behavior relevant to UV-B; therefore, only the constant DOM scenario is shown.