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5a). This suggests that all individuals have the same diel pattern but at different parts of the seafloor, including areas that are mainly deeper and shallower than the array. A change in depth can reflect movement in the water column or movement across the sloping seafloor. The linear regression of the detection depths as a response to seafloor depth at receiver was highly significant (PBLU9931 molecular weight was high indicating some of the movements must have been further down the slope below the receivers and some were either inshore or into the water column shoreward of the receivers. The across-slope curtain-array configuration chosen for this study was a compromise between 17-DMAG (Alvespimycin) HCl assessing the performance of the fishery closure and examining the ecology of C. zeehaani. Gridded arrays are an alternative with the potential to provide greater insights into habitat use, but generally these have been deployed over much smaller scales ( Heupel et al., 2006a?and?Heupel et al., 2006b). Strategically placed curtains can be used to determine when animals enter or leave an area ( Lacroix et al., 2005), and this was our intention. The very narrow continental slope was amenable to a curtain design as the species? depth range could be covered by 3�C4 receivers and proved to be especially well suited to measuring the shark?s diel pattern of vertical migration. However, the loss of some receivers created uncertainties. These uncertainties were addressed by careful consideration of the statistical analysis. The loss of some receivers limited the understanding of residency that could be gained from the four summary metrics. Duration tended to be high but daily residency tended to be low. This contrast suggests that C. zeehaani typically took several days to move between receivers and/or moved past curtains without being detected. This could have occurred as sharks moved past selleck curtains where receivers were lost ( Fig. 1), or to seaward of the array during deep dives. These problems were partly addressed by using a coarser (monthly) time scale to examine male and female residency. The number of males detected per month decreased during the study, suggesting at least some of the males were non-resident, moving outside the closure area and not returning during the study period. The GAMM model framework compensated for the loss of receivers much better than the simple summary metrics. The GAMM?s smoothing functions accounted for movements in relation to daily, lunar and seasonal patterns in both along-slope and across-slope models.