New publication on the spatiotemporal distribution of harbour porpoises off Maryland, USA
Hello MARMAM community, My co-authors and I are pleased to announce our recent publication in PLOS ONE: Wingfield JE, O’Brien M, Lyubchich V, Roberts JJ, Halpin PN, Rice AN, et al. (2017) Year-round spatiotemporal distribution of harbour porpoises within and around the Maryland wind energy area. PLoS ONE 12(5): e0176653. Abstract Offshore windfarms provide renewable energy, but activities during the construction phase can affect marine mammals. To understand how the construction of an offshore windfarm in the Maryland Wind Energy Area (WEA) off Maryland, USA, might impact harbour porpoises *(Phocoena phocoena*), it is essential to determine their poorly understood year-round distribution. Although habitat-based models can help predict the occurrence of species in areas with limited or no sampling, they require validation to determine the accuracy of the predictions. Incorporating more than 18 months of harbour porpoise detection data from passive acoustic monitoring, generalized auto-regressive moving average and generalized additive models were used to investigate harbour porpoise occurrence within and around the Maryland WEA in relation to temporal and environmental variables. Acoustic detection metrics were compared to habitat-based density estimates derived from aerial and boat-based sightings to validate the model predictions. Harbour porpoises occurred significantly more frequently during January to May, and foraged significantly more often in the evenings to early mornings at sites within and outside the Maryland WEA. Harbour porpoise occurrence peaked at sea surface temperatures of 5°C and chlorophyll *a* concentrations of 4.5 to 7.4 mg m-3. The acoustic detections were significantly correlated with the predicted densities, except at the most inshore site. This study provides insight into previously unknown fine-scale spatial and temporal patterns in distribution of harbour porpoises offshore of Maryland. The results can be used to help inform future monitoring and mitigate the impacts of windfarm construction and other human activities. The publication can be downloaded from: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0176653 Thank you, Jessica -- Jessica Wingfield Faculty Research Assistant Chesapeake Biological Laboratory 146 Williams Street Solomons, MD, 20688 Tel: (1) 410-326-7225
Hello MARMAM community, My co-authors and I are pleased to announce our recent publication in Marine Pollution Bulletin: - Hanna K. Nuuttila, - Chiara M. Bertelli, - Anouska Mendzil, - Nessa Dearle (2017) "Seasonal and diel patterns in cetacean use and foraging at a potential marine renewable energy site". Marine Pollution Bulletin (in press). Online publication complete: 3-NOV-2017. DOI information: 10.1016/j.marpolbul.2017.10.051 https://doi.org/10.1016/j.marpolbul.2017.10.051 Abstract Marine renewable energy (MRE) developments often coincide with sites frequented by small cetaceans. To understand habitat use and assess potential impact from development, echolocation clicks were recorded with acoustic click loggers (C-PODs) in Swansea Bay, Wales (UK). General Additive Models (GAMs) were applied to assess the effects of covariates including month, hour, tidal range and temperature. Analysis of inter-click intervals allowed the identification of potential foraging events as well as patterns of presence and absence. Data revealed year-round presence of porpoise, with distinct seasonal and diel patterns. Occasional acoustic encounters of dolphins were also recorded. This study provides further evidence of the need for assessing temporal trends in cetacean presence and habitat use in areas considered for development. These findings could assist MRE companies to monitor and mitigate against disturbance from construction, operation and decommissioning activities by avoiding times when porpoise presence and foraging activity is highest in the area. Dr Hanna K Nuuttila SEACAMS2 Scientific Officer *Open ocean ecology, marine mammals & marine renewables* College of Science, 138 Wallace Building Swansea University, Singleton Park , Swansea, Wales Coleg Gwyddoniaeth, 138 Adelaid Wallace Prifysgol Abertawe, Parc Singleton, Abertawe, Cymru
participants (2)
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Hanna Nuuttila -
Jessica Wingfield