Temperature thresholds of opportunistic annelids used as benthic indicators of aquaculture impact in Newfoundland (Canada) |
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| Institution: | 1. AZTI–Tecnalia, Marine Research Division, Herrera Kaia Portualdea z/g, 20110 Pasaia, Spain;2. MARUM-Center for Marine Environmental Sciences, University of Bremen, 28359 Bremen, Germany;3. Instituto Português do Mar e da Atmosfera (IPMA I.P.), Avenida 5 de Outubro s/n, 8700-305 Olhao, Portugal;4. Spanish Institute of Oceanography, Corazón de María 8, 28002 Madrid, Spain;5. Department of Life Science and Environment, University of Cagliari, Via Fiorelli 1, 09126 Cagliari, Italy;6. Environmental Isotope Laboratory, Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721, USA;7. Faculty of Fisheries, Istanbul University, Ordu Cad. No 200, 34470, Laleli, Istanbul, Turkey;8. Federation of Maltese Aquaculture Producers, 54 St. Christopher Str., Valletta, VLT 1462, Malta;9. Department of Marine Biology, Texas A&M University, 1001 Texas Clipper Road, Galveston, TX 77553, USA;1. Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John''s, Newfoundland, Canada;2. Biological and Physical Oceanography Section, Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, St. John''s, Newfoundland, Canada |
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| Abstract: | In Newfoundland, Canada, aquaculture sites set up over deep, hard bottom substrates dictate the use of visual indicators to monitor aquaculture footprints on the seafloor. Opportunistic annelids (referred to as opportunistic polychaete complexes, or OPC) are among these indicators. The effect of temperature on the distribution and survival of Ophryotrocha cyclops, the species constituting OPC in Newfoundland aquaculture sites is not known. To address this knowledge gap, this study assesses O. cyclops survival at different temperatures in the laboratory, and describes relationships between O. cyclops presence and seafloor temperatures measured in the field. Results show that worms died within two days at temperatures > 12 °C in the laboratory, and appear restricted to temperatures below 7.9 °C at aquaculture sites, tending to be more frequent at temperatures below 5 °C. We recommend that seafloor temperature be recorded and considered in the assessment of benthic aquaculture impact based on OPC presence. |
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| Keywords: | Dorvilleidae Indicator species Environmental impact assessment Temperature |
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