Results of a short study of interactions of cetaceans and longline fisheries in Atlantic waters: environmental correlates of catches and depredation events

Hernández-Milian, Gema; Goetz, Sabine; Varela‐Dopico, Catuxa; Rodriguez-Gutierrez, José; Romón-Olea, Joge; Fuertes-Gamundi, José R.; Ulloa-Alonso, Edelmiro; Tregenza, Nick; Smerdon, Andy; Otero, Monserrat G.; Tato, V.; Wang, Jianjun; Santos, M. Begoña; López, Alfredo; Lago, Rebeca; Portela, J.; Pierce, Graham J.

doi:10.1007/978-1-4020-9141-4_19

Cited by 11 publications

(11 citation statements)

References 26 publications

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“…More information is known about the influence of moon phase on the migration of top predators (Neves Dos Santos & Garcia, 2005;Damalas et al, 2007). Hernandez-Milian et al (2008) showed significant positive relationships between moon phase and sightings of short-beaked common dolphin (Delphinus delphis, Linnaeus, 1758) and Atlantic spotted dolphin (Stenella frontalis, Cuvier, 1829) in the Azores. Although previous studies suggest that moon phase is likely to be important in determining behaviour of the many delphinid species that forage on vertically migrating prey (Hernandez-Milian et al, 2008;Benoit-Bird et al, 2009), our results show that the lunar phase is not correlated with dolphin interaction in these waters.…”

Section: Discussionmentioning

confidence: 94%

“…Fish damage caused by dolphins can be distinguished from damage caused by sea turtles since dolphins bite behind the gills, leaving bite marks with ragged borders and often leaving behind just the head or the body of the fish (Fig. 1), whereas sea turtles leave different small bites on the fish (Hernandez-Milian et al, 2008). The fish species caught in the nets were identified, measured and weighed for each haul.…”

Section: Sampling Methodsmentioning

confidence: 99%

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Interaction between bottlenose dolphin (Tursiops truncatus) and trammel nets in the Archipelago de La Maddalena, Italy

et al. 2014

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Interactions between bottlenose dolphins (Tursiops truncatus) and fisheries are an increasing problem in the Mediterranean and effective management measures are needed. In order to assess the impact of dolphin interactions on artisanal trammel nets, we examine 354 fishing operations performed in waters of the Archipelago de La Maddalena (Italy). We evaluate whether interactions were related to the species composition of the catch and, using the local commercial value of the target species, we assess whether there was a real economic loss for fishermen. Bayesian models and partial correspondence analysis were used to determine the extent to which dolphin interactions and habitat differences contributed to variation in the species composition of catches. CPUE for fishing operations with no dolphin interactions was significantly higher than that for operations with dolphin interactions, although clearly this does not confirm a direct causal link, and associated economic loss was estimated to be non-significant. Geographic location, season, depth of seabed, moon phase, and mesh size were all important factors affecting the amount and species composition of the catch. Our results suggest that it is likely that these differences in species composition are due to a mixture of habitat and dolphin-induced effects.

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Section: Discussionmentioning

confidence: 94%

Section: Sampling Methodsmentioning

confidence: 99%

Interaction between bottlenose dolphin (Tursiops truncatus) and trammel nets in the Archipelago de La Maddalena, Italy

et al. 2014

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“…Depredation and bycatch (accidental capture) are both negative interactions between fisheries and toothed whales, and can occur simultaneously, bycatch sometimes coinciding with fish damage (Hernandez-Milian et al, 2008). Similar measures are therefore used to mitigate both of them, and most research are currently focusing on the use of active acoustic deterrents (McPherson and Nishida, 2010;McPherson et al, 2007McPherson et al, , 2008.…”

Section: Discussionmentioning

confidence: 96%

Pelagic longline fishing trials to shape a mitigation device of the depredation by toothed whales

Rabearisoa¹,

Bach²,

Tixier³

et al. 2012

Journal of Experimental Marine Biology and Ecology

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“…Attacks on surfers in Recife (Brazil), for example, are much more common during new and full moons than during first and last quarters (Hazin et al 2008). Moon phase also appears to have an important effect on shark catches in Atlantic waters (Hernandez-Milian et al 2008) in the Pacific (Pallares andGarcia-Mamolar 1985, Bigelow et al 1999) and the Mediterranean (Damalas et al 2007). While most of these studies analyse the effect of the different phases of the moon on individual species, our results show that the effect of the moon can (1) be even at a day scale, (2) affect groups of species from the same taxonomical group, and (3) be related to other factors such as the kind of habitat.…”

Section: Discussionmentioning

confidence: 99%

Factors affecting the fishing impact on cartilaginous fishes in southeastern Spain (western Mediterranean Sea)

Mendoza¹,

Garrido²

2014

Sci. Mar.

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Summary:We propose a global index of impact based on the relative vulnerability of the local population of every species and the further application of regression trees globally optimized with evolutionary algorithms to study the fishing impact on the cartilaginous fish in southeastern Spain. The fishing impact is much higher in areas of less than 40 m depth within 11 km of the Cape Palos marine reserve. The impact also depends on the state of the sea and the kind of habitat. Deep-sea habitats associated with hard substrata and sandy beds show the highest impact, and sublittoral muds and habitats associated with circalittoral rocks with moderate energy show the lowest impact. The fishing impact changes throughout the moon cycle, showing different day-scale patterns associated with different habitats and different species compositions. Finally, we show that the global optimization of the regression trees can be essential to find some important patterns and that these trees are a useful tool for determining which areas are considered to be more important in terms of protection, taking into account specifically the vulnerability of the local populations.Keywords: Cape of Palos MPA; conservation; cartilaginous fish; fishing impact; regression trees; evolutionary algorithms; vulnerable species. Factores que afectan el impacto pesquero sobre peces cartilaginosos en el sureste español (Mediterráneo Suroccidental)Resumen: Proponemos un índice global de impacto basado en la vulnerabilidad relativa de las poblaciones locales de cada una de las especies y la posterior aplicación de árboles de regresión globalmente optimizados con algoritmos evolutivos, para estudiar el impacto de la pesca en los peces cartilaginosos del sureste español. El impacto de la pesca es mucho mayor, dentro de los 11 km de la reserva marina de Cabo de Palos, en aquellas zonas de menos de 40 m de profundidad. El impacto también depende del estado de la mar y el tipo de hábitat. Los hábitats de aguas profundas asociados a sustrato duro y fondo arenoso muestran los máximos impactos, mientras que, tanto los fondos fangosos sublitorales como los hábitats rocosos circalitorales con moderada energía de las corrientes, muestran un menor impacto. Además, se dan cambios a lo largo del ciclo lunar en el impacto de la pesca, lo que significa que existen diferentes patrones diarios, asociados a distintos hábitats, con distinta composición específica. Finalmente, mostramos que la optimización global de los árboles de regresión es esencial para revelar patrones importantes y son una herramienta útil para determinar aquellas áreas mas importantes en términos de protección, teniendo en cuenta, concretamente, la vulnerabilidad de las poblaciones locales Palabras clave: Área Marina Protegida de Cabo de Palos; conservación; peces cartilaginosos; impacto pesquero; árboles de regresión; algoritmos evolutivos; especies vulnerables. Citation/Como citar este artículo: Mendoza M., Garrido D., Jose M.

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Results of a short study of interactions of cetaceans and longline fisheries in Atlantic waters: environmental correlates of catches and depredation events

Cited by 11 publications

References 26 publications

Interaction between bottlenose dolphin (Tursiops truncatus) and trammel nets in the Archipelago de La Maddalena, Italy

Interaction between bottlenose dolphin (Tursiops truncatus) and trammel nets in the Archipelago de La Maddalena, Italy

Pelagic longline fishing trials to shape a mitigation device of the depredation by toothed whales

Factors affecting the fishing impact on cartilaginous fishes in southeastern Spain (western Mediterranean Sea)

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