Depredation by Coastal Bottlenose Dolphins (Tursiops truncatus) in the Southwestern Gulf of Mexico in Relation to Fishing Techniques

Rechimont, Maria E.; Lara-Domínguez, Ana Laura; Morteo, Eduardo; Martínez-Serrano, Ibiza; Equihua, Miguel

doi:10.1578/am.44.5.2018.469

Cited by 22 publications

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“…Sociocultural factors, such as perceptions, can influence the level of tolerance of fishers towards depredation and, therefore, the degree to which it is reported (Dickman, 2010). Perceptions of depredation may be disproportionate to the actual scale of the conflict, with a tendency of fishers to attribute decreased fishing success to marine predators and overestimate or overreport the problem (Bearzi et al, 2011;Machado et al, 2016;Rechimont, Lara-Domínguez, Morteo, Martínez-Serrano, & Equihua, 2018). This tendency was assumed resulting from large marine predators being a visible and conspicuous part of the environment of fishers often seen as a risk or competitors (Iriarte & Marmontel, 2013;Pardalou & Tsikliras, 2018) and can be strengthened by economic factors such as the value of the fish (Lauriano, 2004).…”

Section: Quantifying the Determinants Of Depredationmentioning

confidence: 99%

When large marine predators feed on fisheries catches: Global patterns of the depredation conflict and directions for coexistence

et al. 2020

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The sustainable mitigation of human-wildlife conflicts has become a major societal and environmental challenge globally. Among these conflicts, large marine predators feeding on fisheries catches, a behaviour termed "depredation," has emerged concomitantly with the expansion of the world's fisheries. Depredation poses threats to both the socioeconomic viability of fisheries and species conservation, stressing the need for mitigation. This review synthesizes the extent and socio-ecological impacts of depredation by sharks and marine mammals across the world, and the

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Section: Quantifying the Determinants Of Depredationmentioning

confidence: 99%

When large marine predators feed on fisheries catches: Global patterns of the depredation conflict and directions for coexistence

et al. 2020

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“…Much of its economy depends on artisanal fisheries, mainly for products of commercial importance such as sea bass ( Centropomus parallelus ), mackerels ( Gerres cinereus , Scomberomurus regalis ), snappers ( Lutjanus sp. ), mullets ( Mugil curema ), red drums ( Sciaenops ocellatus ) and jacks ( Caranx hipos ) (Morteo, 2011; Rechimont et al ., 2018). Fishers generally use 7 m long fibreglass outboard motorboats (40 hp) in fish captures; their implements are diverse and depend on the target species, such as hand lines, long lines and different types of gillnets (Jiménez & Castro, 2007; Morteo & Hernández-Candelario, 2007; Rechimont et al ., 2018).…”

Section: Methodsmentioning

confidence: 99%

“…), mullets ( Mugil curema ), red drums ( Sciaenops ocellatus ) and jacks ( Caranx hipos ) (Morteo, 2011; Rechimont et al ., 2018). Fishers generally use 7 m long fibreglass outboard motorboats (40 hp) in fish captures; their implements are diverse and depend on the target species, such as hand lines, long lines and different types of gillnets (Jiménez & Castro, 2007; Morteo & Hernández-Candelario, 2007; Rechimont et al ., 2018). The latter are the most frequently deployed in this study area (Morteo et al ., 2012, 2014; Rechimont et al ., 2018), and are over ~700 m long and 3.5 cm mesh size in average.…”

Section: Methodsmentioning

confidence: 99%

“…The opportunistic feeding habits of bottlenose dolphins (Hill et al ., 2003; Rocklin et al . 2009) may play an important role in their frequent interactions with fisheries, as a result of competition for common prey species (Reeves et al ., 2001; Lauriano et al ., 2004; Waples et al ., 2013; Morteo et al ., 2014; Rechimont et al ., 2018).…”

Section: Introductionmentioning

confidence: 99%

“…These interactions are commonly reported and widely distributed across the world (Rocklin et al ., 2009; Powell & Wells, 2011; Jaiteh et al ., 2013; Adimey et al ., 2014; Morteo et al ., 2014); however, there are no studies in Mexico that describe in detail the strategies used by these cetaceans, as well as their behavioural changes in relation to the presence of artisanal fishing activities. Therefore, we studied a bottlenose dolphin population in the coastal waters of the western Gulf of Mexico, where the dolphin–fisheries interactions are well known to cause conflict due to depredation on fishing gear (Morteo et al ., 2012, 2014, 2017; Rechimont et al ., 2018). Our main goal was to document behavioural variations in relation to dolphin group size and age structure, using their proximity towards the artisanal fishing as an indicator of the types of interactions.…”

Section: Introductionmentioning

confidence: 99%

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Influence of artisanal fisheries on the behaviour and social structure ofTursiops truncatusin the South-western Gulf of Mexico

2019

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Behavioural plasticity in animals is tested whenever competitive interactions for space and/or food resources occur between wildlife and human activities. This study uses the concepts of operational and non-operational interactions between bottlenose dolphins (Tursiops truncatus) and artisanal fisheries in Alvarado, to search for differences in behaviour, age structure and group size. We conducted 20 surveys between 2015 and 2016, and recorded 64 groups by means of scan sampling from either a research boat or a fixed vantage point. Average dolphin group size was small (${\bar{\rm x}}$ = 3.2, SD = 2.2 individuals) and fewer individuals were commonly present when interaction with fisheries occurred. Operational interactions were defined within the first 30 m and occurred mainly with lone individuals (54% recorded from the lighthouse and 82% during surveys); this benchmark also accounted for higher frequencies in locomotion and feeding (χ2 = 83.10; df = 7; P < 0.001). We found a higher rate of new behavioural events for dolphin groups furthest from human activities, as well as a decrease in behaviours that imply greater body exposure as dolphins approach the fishing spots. Age structure and dolphin group size were not different during and in the absence of interaction with fisheries, but most interactions involved male dolphins. Behavioural variations in the dolphins' repertoire are likely a strategy to reduce the risk of injuries or death when interacting with human activities; these dolphins seem to have habituated to or at least tolerate fishing activities within the study area, possibly constituting a sex-biased pressure.

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Common bottlenose dolphin (Tursiops truncatus) interaction with fish farms in the Gulf of Ambracia, western Greece

Andrés

Cardona

Gonzalvo

2021

Aquatic Conservation

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1. Marine aquaculture, and its fast-growing development, has the potential for wider environmental, ecosystem, and biodiversity impacts. This study assesses the impact of fish farming on a bottlenose dolphin (Tursiops truncatus) population within the Gulf of Ambracia (western Greece) between 2007 and 2018. Two different study areas were defined in order to investigate differences on occurrence, abundance, behaviour, and seasonal fluctuations between them: a 'control area', in the north-western side of the Gulf; and a 'fish farm area', in the south west, where the highest density of fish farm cages is found.2. A total of 169 daily surveys were dedicated to the control area and 74 days were dedicated to the fish farm area, yielding 104 and 37 sightings, respectively. Both the probability of detecting dolphins (U = 6,763.000, P = 0.002) and the group sizes (U = 578.000, P < 0.001) were smaller around fish farms.3. Seasonality analyses were restricted to 2007-2008, as this was the period with year-round effort. Results revealed that dolphins were more frequently seen around fish farms in the winter (Kruskal-Wallis test, P = 0.036).4. From the 40 identified individuals that were re-sighted at least 10 times during the study period, 21 used the fish farm area less than expected according to sampling effort, and 10 of them were never observed in that area (binomial test, P < 0.05).5. The results revealed an impact of fish farms on the distribution of bottlenose dolphins in the Gulf of Ambracia. This information should be taken into consideration when defining ecosystem-based management measures within the management plan, which is currently in preparation for this Natura 2000 site.

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Depredation by Coastal Bottlenose Dolphins (Tursiops truncatus) in the Southwestern Gulf of Mexico in Relation to Fishing Techniques

Cited by 22 publications

References 0 publications

When large marine predators feed on fisheries catches: Global patterns of the depredation conflict and directions for coexistence

When large marine predators feed on fisheries catches: Global patterns of the depredation conflict and directions for coexistence

Influence of artisanal fisheries on the behaviour and social structure ofTursiops truncatusin the South-western Gulf of Mexico

Common bottlenose dolphin (Tursiops truncatus) interaction with fish farms in the Gulf of Ambracia, western Greece

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