Cetacean occurrence, habitat preferences and potential for cetacean-fishery interactions in Iberian Atlantic waters: results from cooperative research involving local stakeholders

Sabine Goetz*, Fiona L. Read, Marisa Ferreira, Julio Martinez Portela, Maria Begona Santos, Jose Vingada, Ursula Siebert, Ana Marcalo, Jorge Santos, Helder Araujo, Silvia Monteiro, Mara Caldas, Marcos Riera, Graham J. Pierce

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Iberian Atlantic waters are heavily exploited by Spanish and Portuguese fisheries. Overlaps between fishery target species and cetacean diet, and between fishing grounds and cetacean foraging areas, can lead to cetacean-fishery interactions including bycatch mortality of cetaceans. 

The present study assesses cetacean distribution, habitat preferences and hotspots for cetacean-fishery interactions by using a cooperative research approach with stakeholder participation (fishers, fisheries observers, fisheries authorities, scientists), as well as the combination of different opportunistic data sources (interviews, on-board observations). The usefulness of each data type is evaluated. The implications of results for the monitoring and mitigation of cetacean-fishery interactions are discussed. 

Generalized linear models and GIS maps were used to relate cetacean occurrence patterns to environmental variables (geographic area, water depth, coastal morphology) and to fishing activities (fishing grounds, fisheries target species). Common and bottlenose dolphins were the most frequently sighted species, the former in waters >50 m, frequently from purse seiners and trawlers, and the latter particularly inside the south Galician rias and close to vessels operating further offshore in Portuguese waters. Harbour porpoises were seen over the whole continental shelf, often next to beach seines, while long-finned pilot whales and striped dolphins were mostly seen from vessels fishing offshore. 

Results suggest that cetacean occurrence is linked to prey distribution and that interactions with fisheries are most likely for common dolphins (with coastal purse seines and offshore trawls), bottlenose dolphins and harbour porpoises (coastal nets). The different data sources were complementary and provided results broadly consistent with previous studies on cetacean occurrence in the same area, although sightings frequency for some cetacean species was biased by survey method. Opportunistic sampling has certain restrictions concerning reliability, but can cover a wide area at comparatively low cost and make use of local ecological knowledge to yield information required for cetacean conservation. 

Original languageEnglish
Pages (from-to)138-154
Number of pages17
JournalAquatic Conservation: Marine and Freshwater Ecosystems
Volume25
Issue number1
Early online date26 Jun 2014
DOIs
Publication statusPublished - 12 Feb 2015

Keywords

  • ocean
  • habitat mapping
  • distribution
  • mammals
  • fishing
  • bottle-nosed-dolphin
  • North-West Spain
  • Galicia NW Spain
  • delphinus-delphis
  • harbor porpoise
  • marine mammals
  • interview survey
  • adjacent waters
  • management
  • diet

Cite this

Cetacean occurrence, habitat preferences and potential for cetacean-fishery interactions in Iberian Atlantic waters : results from cooperative research involving local stakeholders. / Goetz, Sabine; Read, Fiona L.; Ferreira, Marisa; Martinez Portela, Julio; Begona Santos, Maria; Vingada, Jose; Siebert, Ursula; Marcalo, Ana; Santos, Jorge; Araujo, Helder; Monteiro, Silvia; Caldas, Mara; Riera, Marcos; Pierce, Graham J.

In: Aquatic Conservation: Marine and Freshwater Ecosystems, Vol. 25, No. 1, 12.02.2015, p. 138-154.

Research output: Contribution to journalArticle

Goetz, S, Read, FL, Ferreira, M, Martinez Portela, J, Begona Santos, M, Vingada, J, Siebert, U, Marcalo, A, Santos, J, Araujo, H, Monteiro, S, Caldas, M, Riera, M & Pierce, GJ 2015, 'Cetacean occurrence, habitat preferences and potential for cetacean-fishery interactions in Iberian Atlantic waters: results from cooperative research involving local stakeholders', Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 25, no. 1, pp. 138-154. https://doi.org/10.1002/aqc.2481
Goetz, Sabine ; Read, Fiona L. ; Ferreira, Marisa ; Martinez Portela, Julio ; Begona Santos, Maria ; Vingada, Jose ; Siebert, Ursula ; Marcalo, Ana ; Santos, Jorge ; Araujo, Helder ; Monteiro, Silvia ; Caldas, Mara ; Riera, Marcos ; Pierce, Graham J. / Cetacean occurrence, habitat preferences and potential for cetacean-fishery interactions in Iberian Atlantic waters : results from cooperative research involving local stakeholders. In: Aquatic Conservation: Marine and Freshwater Ecosystems. 2015 ; Vol. 25, No. 1. pp. 138-154.
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abstract = "Iberian Atlantic waters are heavily exploited by Spanish and Portuguese fisheries. Overlaps between fishery target species and cetacean diet, and between fishing grounds and cetacean foraging areas, can lead to cetacean-fishery interactions including bycatch mortality of cetaceans. The present study assesses cetacean distribution, habitat preferences and hotspots for cetacean-fishery interactions by using a cooperative research approach with stakeholder participation (fishers, fisheries observers, fisheries authorities, scientists), as well as the combination of different opportunistic data sources (interviews, on-board observations). The usefulness of each data type is evaluated. The implications of results for the monitoring and mitigation of cetacean-fishery interactions are discussed. Generalized linear models and GIS maps were used to relate cetacean occurrence patterns to environmental variables (geographic area, water depth, coastal morphology) and to fishing activities (fishing grounds, fisheries target species). Common and bottlenose dolphins were the most frequently sighted species, the former in waters >50 m, frequently from purse seiners and trawlers, and the latter particularly inside the south Galician rias and close to vessels operating further offshore in Portuguese waters. Harbour porpoises were seen over the whole continental shelf, often next to beach seines, while long-finned pilot whales and striped dolphins were mostly seen from vessels fishing offshore. Results suggest that cetacean occurrence is linked to prey distribution and that interactions with fisheries are most likely for common dolphins (with coastal purse seines and offshore trawls), bottlenose dolphins and harbour porpoises (coastal nets). The different data sources were complementary and provided results broadly consistent with previous studies on cetacean occurrence in the same area, although sightings frequency for some cetacean species was biased by survey method. Opportunistic sampling has certain restrictions concerning reliability, but can cover a wide area at comparatively low cost and make use of local ecological knowledge to yield information required for cetacean conservation. ",
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author = "Sabine Goetz and Read, {Fiona L.} and Marisa Ferreira and {Martinez Portela}, Julio and {Begona Santos}, Maria and Jose Vingada and Ursula Siebert and Ana Marcalo and Jorge Santos and Helder Araujo and Silvia Monteiro and Mara Caldas and Marcos Riera and Pierce, {Graham J.}",
note = "ACKNOWLEDGEMENTS We wish to express our gratitude to all Galician and Portuguese fishers that took part in the survey for sharing their time and information with us. We would also like to acknowledge the support of the Galician Council for Rural and Marine Affairs (Conseller{\'i}a do Medio Rural e do Mar, Xunta de Galicia), namely the cooperation of the fisheries´ observers (Luis P{\'e}rez Miser, Francisco Jos{\'e} L{\'o}pez, Juan Chapela Portela, Felix Barreiro, Candido Aguiar Couto, Jos{\'e} Mar{\'i}a Garc{\'i}a Rozamontes, Jos{\'e} Manuel Garrido Vispo, Jos{\'e} Manuel P{\'e}rez Veres, Javier Garc{\'i}a Romero, Juan Gonz{\'a}lez P{\'e}rez), the coordinators (Ricardo Arnaiz Ibarrondo, Francisco Filgueira Rodr{\'i}guez) and the staff (Manuel Garc{\'i}a Tasende, Jorge Rib{\'o} Land{\'i}n, Jos{\'e} Manuel Campelos {\'A}lvarez) of the Technical Unit for Inshore Fisheries. Furthermore, we would like to thank Baltasar Pati{\~n}o and Gersom Costas for provision of background information and logistical support, and Juan Santos and Edward Morgan, for assisting with the interviewing. Interviews in Galicia were carried out in the framework of the project ECOSUMMER (ECOsystem approach to Sustainable Managament of the Marine Environment and its living Resource) with EU funding (projects MEXC-CT-2006-042337 and MEST-CT-2005-020501). The interview survey in Portugal was conducted under the SafeSea Project (Sustainable local fisheries and promotion of a safe sea for cetaceans) and supported by the EEA Grants programme (EEA Financial Mechanism 2004-2009). SG was also funded by the German Academic Exchange Service (DAAD) and the Funda{\cc}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT). MBS participation was part of the EU FP7 grant MYFISH (no. 289257) and the LOTOFPEL project (Plan Nacional de I + D + I, CTM 2010-16053). The Whalewatch Project was financed by the Xunta de Galicia (programme PEME I+D e I+D SUMA).",
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TY - JOUR

T1 - Cetacean occurrence, habitat preferences and potential for cetacean-fishery interactions in Iberian Atlantic waters

T2 - results from cooperative research involving local stakeholders

AU - Goetz, Sabine

AU - Read, Fiona L.

AU - Ferreira, Marisa

AU - Martinez Portela, Julio

AU - Begona Santos, Maria

AU - Vingada, Jose

AU - Siebert, Ursula

AU - Marcalo, Ana

AU - Santos, Jorge

AU - Araujo, Helder

AU - Monteiro, Silvia

AU - Caldas, Mara

AU - Riera, Marcos

AU - Pierce, Graham J.

N1 - ACKNOWLEDGEMENTS We wish to express our gratitude to all Galician and Portuguese fishers that took part in the survey for sharing their time and information with us. We would also like to acknowledge the support of the Galician Council for Rural and Marine Affairs (Consellería do Medio Rural e do Mar, Xunta de Galicia), namely the cooperation of the fisheries´ observers (Luis Pérez Miser, Francisco José López, Juan Chapela Portela, Felix Barreiro, Candido Aguiar Couto, José María García Rozamontes, José Manuel Garrido Vispo, José Manuel Pérez Veres, Javier García Romero, Juan González Pérez), the coordinators (Ricardo Arnaiz Ibarrondo, Francisco Filgueira Rodríguez) and the staff (Manuel García Tasende, Jorge Ribó Landín, José Manuel Campelos Álvarez) of the Technical Unit for Inshore Fisheries. Furthermore, we would like to thank Baltasar Patiño and Gersom Costas for provision of background information and logistical support, and Juan Santos and Edward Morgan, for assisting with the interviewing. Interviews in Galicia were carried out in the framework of the project ECOSUMMER (ECOsystem approach to Sustainable Managament of the Marine Environment and its living Resource) with EU funding (projects MEXC-CT-2006-042337 and MEST-CT-2005-020501). The interview survey in Portugal was conducted under the SafeSea Project (Sustainable local fisheries and promotion of a safe sea for cetaceans) and supported by the EEA Grants programme (EEA Financial Mechanism 2004-2009). SG was also funded by the German Academic Exchange Service (DAAD) and the Fundação para a Ciência e a Tecnologia (FCT). MBS participation was part of the EU FP7 grant MYFISH (no. 289257) and the LOTOFPEL project (Plan Nacional de I + D + I, CTM 2010-16053). The Whalewatch Project was financed by the Xunta de Galicia (programme PEME I+D e I+D SUMA).

PY - 2015/2/12

Y1 - 2015/2/12

N2 - Iberian Atlantic waters are heavily exploited by Spanish and Portuguese fisheries. Overlaps between fishery target species and cetacean diet, and between fishing grounds and cetacean foraging areas, can lead to cetacean-fishery interactions including bycatch mortality of cetaceans. The present study assesses cetacean distribution, habitat preferences and hotspots for cetacean-fishery interactions by using a cooperative research approach with stakeholder participation (fishers, fisheries observers, fisheries authorities, scientists), as well as the combination of different opportunistic data sources (interviews, on-board observations). The usefulness of each data type is evaluated. The implications of results for the monitoring and mitigation of cetacean-fishery interactions are discussed. Generalized linear models and GIS maps were used to relate cetacean occurrence patterns to environmental variables (geographic area, water depth, coastal morphology) and to fishing activities (fishing grounds, fisheries target species). Common and bottlenose dolphins were the most frequently sighted species, the former in waters >50 m, frequently from purse seiners and trawlers, and the latter particularly inside the south Galician rias and close to vessels operating further offshore in Portuguese waters. Harbour porpoises were seen over the whole continental shelf, often next to beach seines, while long-finned pilot whales and striped dolphins were mostly seen from vessels fishing offshore. Results suggest that cetacean occurrence is linked to prey distribution and that interactions with fisheries are most likely for common dolphins (with coastal purse seines and offshore trawls), bottlenose dolphins and harbour porpoises (coastal nets). The different data sources were complementary and provided results broadly consistent with previous studies on cetacean occurrence in the same area, although sightings frequency for some cetacean species was biased by survey method. Opportunistic sampling has certain restrictions concerning reliability, but can cover a wide area at comparatively low cost and make use of local ecological knowledge to yield information required for cetacean conservation. 

AB - Iberian Atlantic waters are heavily exploited by Spanish and Portuguese fisheries. Overlaps between fishery target species and cetacean diet, and between fishing grounds and cetacean foraging areas, can lead to cetacean-fishery interactions including bycatch mortality of cetaceans. The present study assesses cetacean distribution, habitat preferences and hotspots for cetacean-fishery interactions by using a cooperative research approach with stakeholder participation (fishers, fisheries observers, fisheries authorities, scientists), as well as the combination of different opportunistic data sources (interviews, on-board observations). The usefulness of each data type is evaluated. The implications of results for the monitoring and mitigation of cetacean-fishery interactions are discussed. Generalized linear models and GIS maps were used to relate cetacean occurrence patterns to environmental variables (geographic area, water depth, coastal morphology) and to fishing activities (fishing grounds, fisheries target species). Common and bottlenose dolphins were the most frequently sighted species, the former in waters >50 m, frequently from purse seiners and trawlers, and the latter particularly inside the south Galician rias and close to vessels operating further offshore in Portuguese waters. Harbour porpoises were seen over the whole continental shelf, often next to beach seines, while long-finned pilot whales and striped dolphins were mostly seen from vessels fishing offshore. Results suggest that cetacean occurrence is linked to prey distribution and that interactions with fisheries are most likely for common dolphins (with coastal purse seines and offshore trawls), bottlenose dolphins and harbour porpoises (coastal nets). The different data sources were complementary and provided results broadly consistent with previous studies on cetacean occurrence in the same area, although sightings frequency for some cetacean species was biased by survey method. Opportunistic sampling has certain restrictions concerning reliability, but can cover a wide area at comparatively low cost and make use of local ecological knowledge to yield information required for cetacean conservation. 

KW - ocean

KW - habitat mapping

KW - distribution

KW - mammals

KW - fishing

KW - bottle-nosed-dolphin

KW - North-West Spain

KW - Galicia NW Spain

KW - delphinus-delphis

KW - harbor porpoise

KW - marine mammals

KW - interview survey

KW - adjacent waters

KW - management

KW - diet

U2 - 10.1002/aqc.2481

DO - 10.1002/aqc.2481

M3 - Article

VL - 25

SP - 138

EP - 154

JO - Aquatic Conservation: Marine and Freshwater Ecosystems

JF - Aquatic Conservation: Marine and Freshwater Ecosystems

SN - 1052-7613

IS - 1

ER -