Interactions Between Leatherback Turtles and Peruvian Artisanal Fisheries

Alfaro‐Shigueto, Joanna; Dutton, Peter H.; Bressem, Marie‐Françoise Van; Mangel, Jeffrey C.

doi:10.2744/1071-8443(2007)6[129:ibltap]2.0.co;2

Cited by 59 publications

(67 citation statements)

References 6 publications

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“…En Perú, se capturan adultos y subadultos de D. coriacea, sin embargo el único ejemplar medido en este trabajo correspondería a un subadulto, es decir, con medidas menores a 128,3 cm de LCC (Alfaro- Shigueto et al 2007). …”

Section: Resultsunclassified

Captura, esfuerzo y captura incidental de la pesca con espinel en el centro de Perú

Ayala

Sánchez-Scaglioni

2014

Rev peru biol

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El objetivo del presente trabajo es dar a conocer algunas características de los viajes de pesca, esfuerzo, captura, peces objetivos, áreas de pesca y captura incidental obtenida a partir de observadores a bordo y bitácoras de pesca. El 85% de los lances se produjeron en los primeros 574 Km de distancia a la costa (309 millas náuticas). El lance más distante estuvo a 1320 Km (712 millas náuticas). Se lanzaron 382000 anzuelos para perico, en 224 lances y 29 viajes de pesca, 94.6% de la captura en peso fue de perico, 2.7% de tiburón azul (Prionace glauca) y 1.3% de diamante (Isurus oxyrinchus). Además, 103790 anzuelos capturaron tiburón, en 109 lances y 12 viajes de pesca, 81,9% de la captura en peso fue de tiburón azul y 16.8% de diamante. La Captura por Unidad de Esfuerzo (CPUE) para perico mostró diferencias significativas entre estaciones, con un máximo entre noviembre y enero. En lo que refiere a tiburón, la CPUE por estaciones también mostró diferencias significativas, los meses con mayores capturas fueron setiembre y octubre. La tortuga verde, Chelonia mydas agassizii, fue la más capturada y dos de cada tres fueron juveniles. Todas las tortugas cabezonas, Caretta caretta, fueron juveniles. Se reporta la captura de un petrel y al parecer, la captura de mamíferos sería escasa. Considerando el gran esfuerzo de esta pesquería, existe la necesidad de monitorearla para contar con información que permita establecer las correspondientes medidas de manejo.

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Section: Resultsunclassified

Captura, esfuerzo y captura incidental de la pesca con espinel en el centro de Perú

Ayala

Sánchez-Scaglioni

2014

Rev peru biol

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“…longlines, gillnets, purse seines, trawls) and scale (coastal, artisanal to pelagic, industrial) (Wallace et al 2010). Although refined spatial data are scarce, leatherbacks have been documented to interact with pelagic longlines (Donoso & Dutton 2010) and driftnets (Frazier & Montero 1990, Eckert & Sarti 1997, as well as smallscale gillnets (Alfaro-Shigueto et al 2007). Ideally, designation of a pelagic multi-use protected area within the South Pacific Gyre could reduce (or eliminate) mortality of leatherback turtles from fisheries interactions, and could also benefit other marine species.…”

Section: Applications For Conservationmentioning

confidence: 99%

“…from tidal inundation, poaching) nests, and increased local community participation in turtle conservation have contributed to turtle protection and recruitment at nesting beaches (Santidrián Tomillo et al 2007). Unfortunately, nesting beach conservation efforts alone have not been sufficient to reduce mortality (overall annual rate estimated at ~22% for the nesting population at Playa Grande, Costa Rica; Santidrián Tomillo et al 2008) from interactions with artisanal and commercial fisheries (Eckert & Sarti 1997, Lewison et al 2004, Alfaro-Shigueto et al 2007, Donoso & Dutton 2010, which continues to present an ongoing threat to the long-term survival of eastern Pacific leatherbacks. Thus, a clear need exists to develop integrated management strategies that address turtle conservation needs during multiple life-history stages, particularly within oceanic habitats where turtles appear to be at highest risk.…”

Section: Introductionmentioning

confidence: 99%

Vertical and horizontal habitat preferences of post-nesting leatherback turtles in the South Pacific Ocean

Shillinger¹,

Swithenbank²,

Bailey³

et al. 2011

Mar. Ecol. Prog. Ser.

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Leatherback turtles are the largest and widest ranging turtle species, and spend much of their time in the offshore pelagic environment. However, the high seas have thus far received little management attention to protect their ecosystems and biodiversity. We tagged 46 female leatherback turtles with satellite transmitters at Playa Grande, Costa Rica from 2004 to 2007. In the present study, we analyzed the vertical and horizontal habitat preferences of these leatherback turtles in the South Pacific Ocean. The turtles exhibited short, shallow dives during their migration southward (mean depth: 45 m; mean duration: 23.6 min), followed by deeper, longer dives (mean depth: 56.7 m; mean duration: 26.4 min) in the South Pacific Gyre that probably indicated searching for prey. We integrated the horizontal movements with remotely sensed oceanographic data to determine the turtles' response to the environment, and applied this information to recommendations for conservation in the pelagic environment. A generalized additive mixed model applied to the daily turtle travel rates confirmed that slower travel rates occurred at cooler sea surface temperatures, higher chlorophyll a concentration and stronger vertical Ekman upwelling, all of which are considered favorable foraging conditions. The southern terminus (35 to 37°S) of the leatherback tracks was also in an area of increased mesoscale activity that might act as a physical mechanism to aggregate their prey, gelatinous zooplankton. However, this could also act as a thermal limit to their distribution. This characterization of leatherback habitat use could aid the development of management efforts within the South Pacific Ocean to reduce mortality of leatherback turtles from fisheries interactions.

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“…In the case of high seas driftnets this led to their closure in the 1990s . SSF have, however, also been shown to affect threatened marine fauna through bycatch (Godley et al, 1998;Van Waerebeek et al, 1997;Awkerman et al, 2006;Lee Lum, 2006;Alfaro-Shigueto et al, 2007, and in some cases, the level of impact is thought to be significant (Eckert and Sarti, 1997;James et al, 2005;RojasBracho et al, 2006;Awkerman et al, 2006;Lewison and Crowder, 2007;Peckham et al, , 2008Mangel et al, 2010). This problem is often accentuated by the fact that SSF mainly operate in developing countries (Berkes et al, 2001), where there are few protective measures in place and/or limited enforcement of any existing measures (Berkes et al, 2001;Dutton and Squires, 2008).…”

Section: Introductionmentioning

confidence: 98%

Where small can have a large impact: Structure and characterization of small-scale fisheries in Peru

Alfaro‐Shigueto

Mangel

Pajuelo³

et al. 2010

Fisheries Research

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162

135

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Interactions Between Leatherback Turtles and Peruvian Artisanal Fisheries

Cited by 59 publications

References 6 publications

Captura, esfuerzo y captura incidental de la pesca con espinel en el centro de Perú

Captura, esfuerzo y captura incidental de la pesca con espinel en el centro de Perú

Vertical and horizontal habitat preferences of post-nesting leatherback turtles in the South Pacific Ocean

Where small can have a large impact: Structure and characterization of small-scale fisheries in Peru

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