Abstract
Despite an increased understanding of marine invasions, non-indigenous species (NIS) continue to be redistributed at both global and regional scales. Since prevention is an important element of NIS programs, monitoring vectors responsible for NIS introductions and spread, such as hull fouling, has become a priority and methods should be selected carefully to balance accuracy, time, and cost. Two common fouling assessment tools for the marine recreational boating vector were evaluated for accuracy using a traditional underwater SCUBA survey in coastal British Columbia: a dockside level of fouling assessment and a behavioral questionnaire model. Results showed that although rapid, dockside assessments did not provide an accurate assessment of fouling present below the surface, at least not in this region. In contrast, a questionnaire-based model using four easily obtained variables (boat type, age of antifouling paint, storage type, and occurrence of long distance trips) reliably identified boats carrying macrofouling species, a proxy for risk of NIS transport. Once validated, this fouling model tool could be applied in border inspection or quarantine situations where decisions must be made quickly. Further development and refinement of rapid assessment tools would improve our ability to prevent new introductions and manage spread of existing invasive species.
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Acknowledgments
The authors are grateful to the marina operators and boat owners for allowing access to their facilities and boats. We thank the following for field and lab assistance: N. Backe, F. Choi, T. Goodman, B. Hill, M. Mach, C. Simkanin, A. Stevenson, and J. Yu. We thank M. Herborg, L. Brown, and three anonymous reviewers for reviewing earlier drafts. Our thanks to the Canadian Aquatic Invasive Species Network (CAISN) for providing conference travel support. This research was funded in part by a grant from the Invasive Alien Species Partnership Program, a Government of Canada initiative, the Aquatic Invasive Species program of Fisheries & Oceans Canada and a National Science and Engineering Research Council (NSERC) Postgraduate Scholarship to CCM.
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Clarke Murray, C., Therriault, T.W. & Pakhomov, E. What Lies Beneath? An Evaluation of Rapid Assessment Tools for Management of Hull Fouling. Environmental Management 52, 374–384 (2013). https://doi.org/10.1007/s00267-013-0085-x
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DOI: https://doi.org/10.1007/s00267-013-0085-x