Gone with the wind: environmental variation influences detection efficiency in a coastal acoustic telemetry array

Table 3 Measured environmental variables for GLMM analysis of detection efficiency in a large-scale range test array (N = 22 receiver stations)

Data	Measurement location	Units	Mean (SD)	Min	Max	Measurement frequency
Temperature	Per station	° Celsius	12.1 (5.2)	− 0.6	24.5	1 h
Tilt	Per station	°	156.9 (15.9)	15	180	1 h
Ambient noise	Per station	mV	399.1 (161.7)	1	999.9	1 h
Wind direction	De Kooy, Vlieland, Hoorn Terschelling	°	200.1 (99.1)	10	360	1 h
Wind speed	De Kooy, Vlieland, Hoorn Terschelling	m/s	6.3 (3.3)	0	27	1 h
Bottom depth	Per station	m NAP	− 8.8 (5.6)	− 1.7	− 31.4	Single measurement
Relative water level	Per station	m	0 (1)	− 2.8	3.7	1 h
Topographic position index	Per station	Proportion	− 0.1 (0.2)	− 0.6	0.5	Single measurement

Continuous measurements were recorded by VR2Tx acoustic receivers (temperature, tilt, and ambient noise) and by measurement stations of the Royal Netherlands Meteorological Institute (KNMI) at Den Kooy, Vlieland, and Hoorn Terschelling. Water-level measurements and bathymetric data were made available by Rijkswaterstaat. Continuous data were binned to hourly intervals for comparison to hourly detection efficiency. Data from receiver pairs separated by > 800 m distance were excluded

ISSN: 2050-3385