Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America

Small-scale coastal fisheries can cause detrimental impacts to non-target megafauna through bycatch. This can be particularly true when high-use areas for such species overlap with fishing grounds, as is the case with hawksbill turtle (Eretmochelys imbricata) aggregations at lobster gillnet fishing...

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Autores principales:	Liles,Michael J, Gaos,Alexander R, Bolaños,Allan D, Lopez,Wilfredo A, Arauz,Randall, Gadea,Velkiss, Urteaga,José, Yañez,Ingrid L, Pacheco,Carlos M, Seminoff,Jeffrey A, Peterson,Markus J
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2017
Materias:	bycatch rate foraging hotspot developmental biogeography marine conservation community-based governance habitat protection
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000300003
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spelling	oai:scielo:S0718-560X20170003000032017-09-14Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central AmericaLiles,Michael JGaos,Alexander RBolaños,Allan DLopez,Wilfredo AArauz,RandallGadea,VelkissUrteaga,JoséYañez,Ingrid LPacheco,Carlos MSeminoff,Jeffrey APeterson,Markus J bycatch rate foraging hotspot developmental biogeography marine conservation community-based governance habitat protection Small-scale coastal fisheries can cause detrimental impacts to non-target megafauna through bycatch. This can be particularly true when high-use areas for such species overlap with fishing grounds, as is the case with hawksbill turtle (Eretmochelys imbricata) aggregations at lobster gillnet fishing sites in El Salvador and Nicaragua. We quantified hawksbill bycatch by partnering with local fishers to record data for 690 gillnet sets on rocky reefs at Los Cobanos Reef Marine Protected Area (2008-2009) and Punta Amapala (2012-2014) in El Salvador, and La Salvia (2012-2014) in Nicaragua. Based on 31 observed hawksbill captures, the mean bycatch-per-unit-effort (0.0022; individuals per set = 0.0450) and mortality (0.74) are among the highest reported for the species across fishing gear types and oceanic regions worldwide, and we conservatively estimate that at least 227 juvenile hawksbill captures occurred in lobster gillnet fishing fleets at our sites during the study. Estimated mortality for the 227 hawksbills -which could approach the 74% observed mortality of total captures-from interactions with lobster gillnet fisheries at these sites during the study period may constitute the greatest single source of human-induced in-water mortality for juvenile, sub-adult, and adult hawksbills in the eastern Pacific, and is of grave concern to the population. Based on our findings, we discuss neritic habitat use by hawksbills during their 'lost years' and offer recommendations for bycatch reduction strategies, including community-based efforts to enhance sustainable self-governance via the establishment of locally crafted conservationist norms and marine protected areas at important developmental habitat.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.45 n.3 20172017-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000300003en10.3856/vol45-issue3-fulltext-3
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	bycatch rate foraging hotspot developmental biogeography marine conservation community-based governance habitat protection
spellingShingle	bycatch rate foraging hotspot developmental biogeography marine conservation community-based governance habitat protection Liles,Michael J Gaos,Alexander R Bolaños,Allan D Lopez,Wilfredo A Arauz,Randall Gadea,Velkiss Urteaga,José Yañez,Ingrid L Pacheco,Carlos M Seminoff,Jeffrey A Peterson,Markus J Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America
description	Small-scale coastal fisheries can cause detrimental impacts to non-target megafauna through bycatch. This can be particularly true when high-use areas for such species overlap with fishing grounds, as is the case with hawksbill turtle (Eretmochelys imbricata) aggregations at lobster gillnet fishing sites in El Salvador and Nicaragua. We quantified hawksbill bycatch by partnering with local fishers to record data for 690 gillnet sets on rocky reefs at Los Cobanos Reef Marine Protected Area (2008-2009) and Punta Amapala (2012-2014) in El Salvador, and La Salvia (2012-2014) in Nicaragua. Based on 31 observed hawksbill captures, the mean bycatch-per-unit-effort (0.0022; individuals per set = 0.0450) and mortality (0.74) are among the highest reported for the species across fishing gear types and oceanic regions worldwide, and we conservatively estimate that at least 227 juvenile hawksbill captures occurred in lobster gillnet fishing fleets at our sites during the study. Estimated mortality for the 227 hawksbills -which could approach the 74% observed mortality of total captures-from interactions with lobster gillnet fisheries at these sites during the study period may constitute the greatest single source of human-induced in-water mortality for juvenile, sub-adult, and adult hawksbills in the eastern Pacific, and is of grave concern to the population. Based on our findings, we discuss neritic habitat use by hawksbills during their 'lost years' and offer recommendations for bycatch reduction strategies, including community-based efforts to enhance sustainable self-governance via the establishment of locally crafted conservationist norms and marine protected areas at important developmental habitat.
author	Liles,Michael J Gaos,Alexander R Bolaños,Allan D Lopez,Wilfredo A Arauz,Randall Gadea,Velkiss Urteaga,José Yañez,Ingrid L Pacheco,Carlos M Seminoff,Jeffrey A Peterson,Markus J
author_facet	Liles,Michael J Gaos,Alexander R Bolaños,Allan D Lopez,Wilfredo A Arauz,Randall Gadea,Velkiss Urteaga,José Yañez,Ingrid L Pacheco,Carlos M Seminoff,Jeffrey A Peterson,Markus J
author_sort	Liles,Michael J
title	Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America
title_short	Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America
title_full	Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America
title_fullStr	Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America
title_full_unstemmed	Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America
title_sort	survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the eastern pacific coast of central america
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000300003
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Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America

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