ABSTRACTS OF POSTERS –ACOUSTICS
ac 32 Static acoustic Monitoring of harbour porpoise (Phocoena phocoena) around the world’s first commercial tidal turbine in Strangford Lough, northern Ireland
Cormac Booth (1), Alice Mackay (2), Simon Northridge (2), Carol Sparling (1)
(1) SMRU Ltd (2) Sea Mammal Research Unit
cgb@smru.co.uk
As part of the environmental monitoring programme for the world’s first full-scale commercial demonstration tidal turbine at Strangford Lough, harbour porpoises site use was monitored using static acoustic monitoring methods. TPODs were deployed in Strangford Lough around the turbine site from 2006-2011 in order to detect porpoise presence. A modelling approach was employed to allow the effect of environmental, oceanographic and temporal covariates in assessing the presence and magnitude of any turbine related effects. Generalised Additive Models (GAMs) built within a Generalised Estimating Equations (GEEs) model construct were used to explain harbour porpoise habitat preferences within Strangford Lough. GEEs were used to account for temporal and spatial autocorrelation within the dataset. Porpoises were detected on 86% of days in the study area indicating that porpoises are generally present in the region throughout the study period. Detections per hour were generally low, with most sites recording porpoise detections in <10% of monitored periods and mean detections positive minutes per hour of <1. Time of day, tidal phase, TPOD identity, time of year, installation phase, region and turbine operation all variously affected porpoise detection rates. Diurnal patterns were the strongest observed, with detections being much higher during the night than in the day. Strong tidal patterns were also observed indicating that porpoises may be coming into the lough on the incoming ride, remaining in the Inner Lough over high tide, and moving out of the Lough on the ebb tide. There was no effect of turbine operation at sites closest to the turbine, in the Narrows though a small but significant decline in detections occurred in the Inner Lough when turbine was operating relative to when it was inactive. The magnitude of the turbine related effects were low relative to diurnal, seasonal, monthly, and tidal and TPOD related variation in porpoise detections.
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