New publication: "Harbor Porpoises (Phocoena phocoena) in Dublin Bay: How Does Dredge Disposal Affect Foraging Behavior?"
Dear MARMAM community, My authors and I are please to announce the publication of our article titled "Harbor Porpoises (Phocoena phocoena) in Dublin Bay: How Does Dredge Disposal Affect Foraging Behavior?" in the Marine Mammal Journal. The paper can be found at: http://dx.doi.org/10.1111/mms.70168 Citation: Kootstra, C., C.Russell, S.Berrow, and J.O'Brien. 2026. “Harbor Porpoises (Phocoena phocoena) in Dublin Bay: How Does Dredge Disposal Affect Foraging Behavior?.” Marine Mammal Science42, no. 2: e70168. https://doi.org/10.1111/mms.70168. Abstract: Harbor porpoises (Phocoena phocoena) are among the most widespread cetacean species in Irish waters and are listed under Annex II of the EU Habitats Directive as a species of community importance. The local harbor porpoise population in Dublin Bay coexists with designated spoil grounds for dredging activity, which has increased due to Dublin Port's Alexandra Basin Redevelopment (ABR) project. This study examines the long- and short-term effects of dredge disposal on harbor porpoise foraging behavior over a 5-year period (2017–2021). Acoustic monitoring using C-PODs was conducted inside and outside the Burford Bank disposal site. The effect of dredge disposal on foraging intensity (quantified by hourly buzz:click ratio) was analyzed using Generalized Additive Mixed Models (GAMMs) and assessed using modified Before–After (BA) and Before–After Control-Impact (BACI) frameworks. We classified 33% of detected clicks as buzzes. Foraging intensity increased during three of the four dredging phases compared to non-dredging periods at all monitored locations, including the control site. Short-term responses, however, were highly site-specific. These findings suggest that dredge disposal had no obvious negative impact on harbor porpoise foraging behavior and may have increased food availability. This study provides valuable insights into balancing species conservation with infrastructure development. This publication was made possible by the Irish Whale and Dolphin Group (IWDG)'s monitoring of dredging operations in Dublin Bay for nearly 10 years, in collaboration with Dublin Port Company (DPC) and RPS Group. We thank them for their continued help and support throughout the project. All the best, Cilia Kootstra, PhD candidate. Marine and Freshwater Reasearch Centre (MFRC), Atlantic Technological University (ATU). Tá an ríomhphost seo faoi réir an tséanta seo leanas atá le fáil ag Séanadh Ríomhphost Ollscoil Teicneolaíochta an Atlantaigh<https://www.atu.ie/email-disclaimer> This e-mail is subject to the following disclaimer available at Atlantic TU Email Disclaimer<https://www.atu.ie/email-disclaimer>
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CILIA KOOTSTRA - RESEARCH