Determinación de peces presas consumidos por toninas (Tursiops truncatus) que vararon en la Isla del Carmen, Campeche

Naranjo-Ruiz, Karem Leonela; Delgado-Estrella, Alberto; Morquecho-León, María Raisa Karenina; Torres‐Rojas, Yassir Edén

doi:10.22201/ib.20078706e.2019.90.2513

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Since the dolphins were targeting those components of the catch, these species were also considered potential prey. It is noteworthy that, despite of being one of the species with the highest signs of depredation, C. edentulus is considered an occasional prey (Naranjo-Ruiz et al, 2019) Species richness in catches was slightly lower than previously reported, but diversity values were not different between sets with and without dolphin interaction, as was also described by Rechimont et al (2018). The number of captured fish species is likely the result of the differences between fishing areas, since mesh sizes were the same (22.5 -30 mm).…”

Section: Set Type Nmentioning

confidence: 99%

Opportunistic gillnet depredation by common bottlenose dolphins in the southwestern Gulf of Mexico: Testing the relationship with ecological, trophic, and nutritional characteristics of their prey

et al. 2022

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Competition between fisheries and bottlenose dolphins is a globally relevant conflict given its socioeconomic and ecological implications. Understanding the factors driving the interactions between dolphins and fishery activities is key to the development of appropriate mitigation strategies. Our study aimed to assess whether these interactions are related to the ecological, trophic, and nutritional characteristics of the catch. We used 117 gillnet sets from 48 fishing trips during 2009 – 2010 and 2015 – 2019, which were classified based on the presence or absence of dolphin interactions. These interactions occurred year-round and were documented in 46.1% of the sets, with 14.5% of those showing signs of depredation. The passive acoustic predatory hypothesis, which states that fish species that generate sound are subject to a higher predation intensity by dolphins, was not supported by our data. Also, with the exception of species diversity, ecological parameters such as richness, biomass and CPUE were slightly higher, although not significant in sets with dolphin interaction. Furthermore, during 2015 – 2016, we sampled 123 organisms of 25 representative fish species in the catches and determined the whole fish isotopic composition (δ13C and δ15N), and estimated the nutritional value (i.e., lipid, protein, and energy content) of each species. Isotopic values showed no differences between net settings (with and without interaction), fish habitat, or prey type (potential prey, n= 11 species, vs. non-potential prey, n= 14). However, a preference towards fish from a certain range of thropic levels was evident. All the fish (N= 123) showed significantly higher protein values during the Rainy period, which may be attributed to their reproductive cycles and higher primary productivity. Interestingly, energy contents of the dolphins’ potential prey were also significantly higher during this period. Unexpectedly, protein and energy contents were significantly higher in the fishes caught in the sets without dolphin interaction, but only during the Dry and Windy periods, respectively. Opportunistic feeding habits are well known for bottlenose dolphins, and our results showed that “easy access” to prey will likely prompt interaction with gillnets, regardless of the species composition, biomass, seasonality, preferred habitat, sound production capacity, or nutritional value of the captured fish.

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Section: Set Type Nmentioning

confidence: 99%

Opportunistic gillnet depredation by common bottlenose dolphins in the southwestern Gulf of Mexico: Testing the relationship with ecological, trophic, and nutritional characteristics of their prey

et al. 2022

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“…Although two T. truncatus ecotypes have been recognized, oceanic and coastal (Wells & Scott 2009), the latter is better represented in the Campeche coast, with the largest population (particularly in the Términos Lagoon) recognized as residents. Most of the local historical strandings of this species have been residents (13 dolphins) and four of the oceanic ecotype (Naranjo-Ruiz 2020).…”

Section: Introductionmentioning

confidence: 99%

General health status of a stranded Tursiops truncatus of the oceanic ecotype in southern Gulf of Mexico, Campeche coasts: a multidisciplinary analysis

Naranjo-Ruiz,

Delgado-Estrella,

Torres-Rojas

et al. 2024

Lat. Am. J. Aquat. Res.

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Strandings provide valuable information about rare marine organisms and their relationship with their environment. In the southern Gulf of México, specifically on the central coast of Campeche, Mexico, strandings of oceanic cetaceans have rarely been recorded, therefore, biological information has also been scarce. One of such rare stranding cases occurred on September 7, 2022, on the coast of Seybaplaya, Campeche. The specimen was identified as a female of Tursiops truncatus with the morphology features of the oceanic ecotype. The carcass was examined shortly after death, and samples for different analyses were obtained fresh. Tissue samples were collected, and some particular observations were made to define the individual's general health status. Results of the analyses revealed damage in the liver, lungs, and kidneys, probably related to 1) the advanced age of the organism (>35 years), and 2) the presence of persistent organic pollutants. Most importantly, this study contributed two new findings, the first record of the parasite Anisakis and the presence of renal calculi in the oceanic ecotype of T. truncatus in the southern Gulf of Mexico.

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Potential Residence and Coexistence Strategy of Tursiops truncatus in a Coastal Lagoon in the Southern Gulf of Mexico: Ecological Inferences Using Stable Isotopes

Naranjo-Ruiz,

Torres-Rojas,

Delgado-Estrella

2024

Estuaries and Coasts

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The Terminos Lagoon Flora and Fauna Protection Area is the largest coastal lagoon in the southern Gulf of Mexico and has the largest population of bottlenose dolphins, Tursiops truncatus, reported in the region. Photo identification studies have reported permanent and seasonal residence of dolphins; however, how dolphins coexist ecologically is unknown. In the present study, from 17 dead specimens stranded on the coast of Isla del Carmen (barrier island) between 2014 and 2016, stable isotopes in the liver, heart, and muscle, which represent different time scales, were analyzed to determine residence through δ13C values and niche width and trophic coexistence through δ15N values. Differences between sexes (δ13C liver: p = 0.009; heart: p = 0.01) and age classes (δ15N muscle: p = 0.02) were found, which indicated trophic sexual segregation and changes in resource use during growth, respectively. The lack of significant differences in δ13C values indicated isotopic equilibrium between the tissues, indicating the possible permanent residence of 12 dolphins in Terminos Lagoon as a coastal ecotype (− 16‰) and a second group (five dolphins) as an oceanic ecotype (− 18‰). In conclusion, most dolphins stranded in the Terminos Lagoon are potential permanent residents of this habitat, with evidence of resource partitioning as a coexistence strategy.

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Determinación de peces presas consumidos por toninas (Tursiops truncatus) que vararon en la Isla del Carmen, Campeche

Abstract: Determinación de peces presas consumidos por toninas (Tursiops truncatus) que vararon en la Isla del Carmen, Campeche Determination of prey consumed by bottlenose dolphins (Tursiops truncatus), obtained from strandings in Carmen Island, Campeche

Cited by 4 publications

References 25 publications

Opportunistic gillnet depredation by common bottlenose dolphins in the southwestern Gulf of Mexico: Testing the relationship with ecological, trophic, and nutritional characteristics of their prey

Opportunistic gillnet depredation by common bottlenose dolphins in the southwestern Gulf of Mexico: Testing the relationship with ecological, trophic, and nutritional characteristics of their prey

General health status of a stranded Tursiops truncatus of the oceanic ecotype in southern Gulf of Mexico, Campeche coasts: a multidisciplinary analysis

Potential Residence and Coexistence Strategy of Tursiops truncatus in a Coastal Lagoon in the Southern Gulf of Mexico: Ecological Inferences Using Stable Isotopes

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