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title Quantification of interactions between the Portuguese sardine purse-seine fishery and cetaceans
authors Marcalo, A; Katara, I; Feijo, D; Araujo, H; Oliveira, I; Santos, J; Ferreira, M; Monteiro, S; Pierce, GJ; Silva, A; Vingada, J
author full name Marcalo, Ana; Katara, Isidora; Feijo, Diana; Araujo, Helder; Oliveira, Isabel; Santos, Jorge; Ferreira, Marisa; Monteiro, Silvia; Pierce, Graham J.; Silva, Alexandra; Vingada, Jose
title Quantification of interactions between the Portuguese sardine purse-seine fishery and cetaceans
nationality internacional
language English
document type Article
author keywords bycatch; cetaceans; fisher behaviour; fishery interaction; Portuguese coast; purse-seine
abstract Interactions between cetaceans and the purse-seine fishery operating along the whole Portuguese continental coast were studied based on on-board observations from 2010 to 2011. Cetacean presence and mortality were estimated and characteristics under which interactions were most likely to occur were identified. Observations were made on 163 fishing trips (0.7% of the average annual number of fishing trips) and 302 fishing operations/hauls. Cetaceans were present during 16.9% of fishing events; common dolphins (Delphinus delphis) accounted for 96% of occurrences, mostly overnight in summer and early autumn. Regression models showed that cetacean presence during a fishing set was significantly (p < 0.05) associated with sardine catches, effort, and latitude/longitude. Encirclement and mortality occurred in 2.3 and 1.0% of fishing events, respectively. Encircled species were the common dolphin, bottlenose dolphin (Tursiops truncatus), and harbour porpoise (Phocoena phocoena), but only common dolphin showed mortality (three individuals); raised to fleet level, estimated total mortality rates of common dolphins were 69 (95% CI 37-110) in the north and 91 (95% CI 55-165) in the south for 2010 and 78 (95% CI 47-140) in the south only for 2011. The estimated annual mortality rate due to purse seining is 113 (95% CI 3-264) common dolphins, which is similar to 0.63% of the current most optimistic estimate of population size for the Portuguese fishing area (SCANS II). The wide confidence limits, as well as variation between years, reflect low observer coverage, emphasizing the need for increased monitoring to cover gaps in the spatial and seasonal distribution of observer effort and provide reliable estimates of bycatch.
author address [Marcalo, Ana; Monteiro, Silvia; Pierce, Graham J.; Vingada, Jose] Univ Aveiro, Ctr Environm & Marine Studies CESAM, P-3810193 Aveiro, Portugal; [Marcalo, Ana; Monteiro, Silvia; Pierce, Graham J.; Vingada, Jose] Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal; [Marcalo, Ana; Araujo, Helder; Oliveira, Isabel; Santos, Jorge; Ferreira, Marisa; Monteiro, Silvia; Vingada, Jose] Univ Minho, CBMA, SPVS, Dept Biol, P-4710057 Braga, Portugal; [Katara, Isidora; Silva, Alexandra] IPMA, P-1449006 Lisbon, Portugal; [Feijo, Diana] IPMA, P-4450208 Matosinhos, Portugal; [Pierce, Graham J.] Univ Aberdeen, Oceanlab, Newburgh AB41 6AA, Aberdeen, Scotland
reprint address Marcalo, A (reprint author), Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal.
e-mail address amarcalo@gmail.com
funding agency and grant number project SAFESEA EEAGrants; project Life + MarPro; European Commission [EC 2008/199]; Portuguese Foundation for Science and Technology [SFRH/BPD/64889/2009]
funding text We thank all the skippers and crewmembers of the purse-seiners in all the ports where observation trips took place for contributing with their knowledge and welcoming all the observers aboard. AM gratefully acknowledges N. Oliveira for extra guidance in the analysis and L. Nicolau for GIS mapping. This work was funded by the projects SAFESEA EEAGrants (2008-2010), Life + MarPro (2011-2015), and the European Commission's Data Collection Framework (Reg. EC 2008/199). Data also have been collected under PNAB/EU-DCF-Programa Nacional de Amostragem Biologica/EU-Data Collection Framework. AM is funded by a postdoctoral fellowship (SFRH/BPD/64889/2009) from the Portuguese Foundation for Science and Technology. Landings' data were kindly provided by Direccao-Geral de Recursos Naturais Seguranca e Servicos maritimos (DGRM). A special thank goes to two unknown reviewers whose comments contributed substantially to the improvement of the manuscript.
cited references Amande M. J., 2010, IND OC TUNA COMM P; Read AJ, 2008, J MAMMAL, V89, P541, DOI 10.1644/07-MAMM-S-315R1.1; Hammond PS, 2013, BIOL CONSERV, V164, P107, DOI 10.1016/j.biocon.2013.04.010; Silva A, 2009, ICES J MAR SCI, V66, P495, DOI 10.1093/icesjms/fsn225; Wise L, 2007, SCI MAR, V71, P405; Bolker BM, 2009, TRENDS ECOL EVOL, V24, P127, DOI 10.1016/j.tree.2008.10.008; Silva MA, 1999, J MAR BIOL ASSOC UK, V79, P531, DOI 10.1017/S0025315498000654; Reeves RR, 2013, ENDANGER SPECIES RES, V20, P71, DOI 10.3354/esr00481; Hall MA, 2000, MAR POLLUT BULL, V41, P204, DOI 10.1016/S0025-326X(00)00111-9; Lopez A, 2003, BIOL CONSERV, V111, P25, DOI 10.1016/S0006-3207(02)00244-6; Hamer DJ, 2008, BIOL CONSERV, V141, P2865, DOI 10.1016/j.biocon.2008.08.024; Borges L, 2005, FISH RES, V75, P29, DOI 10.1016/j.fishres.2005.05.002; Lopez BD, 2006, ICES J MAR SCI, V63, P946, DOI 10.1016/j.icesjms.2005.06.012; Read AJ, 2006, CONSERV BIOL, V20, P163, DOI 10.1111/j.1523-1739.2006.00338.x; Fortuna CM, 2010, CHEM ECOL, V26, P65, DOI 10.1080/02757541003627662; Silva MA, 2002, MAR MAMMAL SCI, V18, P893, DOI 10.1111/j.1748-7692.2002.tb01080.x; Borges MF, 2003, SCI MAR, V67, P235; Stratoudakis Y, 2002, ICES J MAR SCI, V59, P1256, DOI 10.1006/jmsc.2002.1314; Ballance LT, 2009, ENCYCLOPEDIA OF MARINE MAMMALS, 2ND EDITION, P196; Bates D., 2014, J STAT SOFTWAR UNPUB, DOI DOI 10.1016/J.JSPS.2012.11.002; Bates D., 2014, LME4 LINEAR MIXED EF; Bates D. M., 2010, IME4 MIXED EFFECTS M; Naes T, 2001, J CHEMOMETR, V15, P413; Boer M. N., 2012, INT J BIODIVERSITY C, V4, P481; DGRM, 2013, DGRM SER EST A, V25 A-B; Feijo D., 2013, THESIS; Fernandez-Contreras MM, 2010, ICES J MAR SCI, V67, P1732, DOI 10.1093/icesjms/fsq077; Sequeira Marina, 1994, Reports of the International Whaling Commission Special Issue, V15, P165; Ferreira M., 2007, THESIS; Gjertsen H., 2010, CONSERVATION MANAGEM; Goetz S, 2015, AQUAT CONSERV, V25, P138, DOI 10.1002/aqc.2481; Hall M. A., 1984, REPORT INT WHALING C, V36, P375; Hilborn R., 1992, QUANTITATIVE FISHERI; ICES, 2014, 2014ACOM28 ICES CM; ICES, 2013, 2013ACOM16 ICES CM; Lennert-Cody Cleridy E., 2004, Journal of Cetacean Research and Management, V6, P151; Marcalo A., 2009, THESIS; Northridge Simon P., 1999, P99; Northridge S. P., 1991, FAO FISHERIES TEC S1, V251; Pestana G., 1989, THESIS; R Core Team, 2013, R LANG ENV STAT COMP; Silva Monica A., 2003, Aquatic Mammals, V29, P88, DOI 10.1578/016754203101023924; Vingada J., 2012, SAFESEA MANUAL APOIO; Ward T. M., 2010, SARDI RES REPORT SER, V493
cited reference count 44
publisher city OXFORD
issn 1054-3139
29-character source abbreviation ICES J MAR SCI
iso source abbreviation ICES J. Mar. Sci.
publication date SEP-OCT
year published 2015
volume 72
issue 8
beginning page 2438
ending page 2449
digital object identifier (doi) 10.1093/icesjms/fsv076
page count 12
web of science category Fisheries; Marine & Freshwater Biology; Oceanography
subject category Fisheries; Marine & Freshwater Biology; Oceanography
document delivery number DB1EU
unique article identifier WOS:000368251600025