How effective is spotlighting for detecting the greater glider ( <i>Petauroides volans</i> )?

Abstract

The efficacy of spotlighting as a field survey technique for detecting the greater glider ( Petauroides volans ) was assessed by comparing the precise location of radio-tracked animals with locations determined simultaneously from spotlighting searches. Radio-collars were fitted to 20 greater gliders in three eucalypt patches embedded within an extensive radiata pine ( Pinus radiata ) plantation near Tumut in south-eastern New South Wales. Our success rate for detecting collared animals was low, even when survey effort was increased. These findings suggest that spotlighting underestimates actual population size. A further, properly designed study, in different forest types is needed to provide precise estimates of the magnitude of the bias in counts of P. volans obtained by spotlighting.