Performance of an ultrasonic telemetry positioning system under varied environmental conditions

Table 2 Parameters included in final GLMMs for both performance metrics at each site, with random intercept terms for transmitter and Julian day

Site	Response variable	Parameters estimated	AIC	Δ AIC	D ²
Coastal	Pos. Error	VA + diel + mean wave period + wtemp	6,755.8	74.3	0.01
	Efficiency	VA + diel + mean wtemp	5,449	1,661.8	0.23
Estuarine ^a	Pos. Error	VA + wtemp + EC + absQ	67,752	982	0.01
	Efficiency	VA + diel + mean wtemp + mean Q	8,110.4	438.2	0.05
Riverine	Pos. Error	VA + river stage	11,338	45	0
	Efficiency	VA + mean river stage + mean turb + mean wtemp	4,697.1	430.6	0.09

Parameters abbreviations include: VA = viewing angle, diel = day vs. night factor, wtemp = water temperature, EC = electrical conductivity, absQ = absolute discharge, mean Q = mean discharge values, turb = turbidity. Δ AIC is the difference in AIC scores between a null model (random effects only) and the final model. D² is calculated as the deviance explained by the model over unexplained deviance in a null model (random effects only), adjusted for sample size and number of model parameters [24].
^aModels also included a random slope term for macrophyte index.

ISSN: 2050-3385