Sport fishing and vessel pressure on the endangered cetacean Delphinus delphis. Towards an international agreement of micro-sanctuary for its conservation

Olaya‐Ponzone, Liliana; Ruíz, R. Espada; Domínguez, D. Patón; Moreno, Estefanía Martín; Marcial, Isabel Cárdenas; Santiago, J. Serradilla; García‐Gómez, José Carlos

doi:10.1016/j.jenvman.2022.116546

Cited by 2 publications

(7 citation statements)

References 56 publications

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“…A higher presence of small boats and fishing boats, as well as motor boats, was observed during the sightings, which is consistent with existing literature (Espada Ruíz et al, 2018;Olaya-Ponzone et al, 2020. In fact, Espada Ruíz and colleagues also described a co-presence of different types of vessels during sightings, 43% of which were whale watching boats, 29% recreational boats (that could encompass our categories of motor and small boats) and were Atlantic Even though 'striped dolphins' have previously been spotted in mixed groups with common dolphins (Olaya-Ponzone et al, 2022), the former were observed as having a wider distribution throughout the Strait. This result could coincide with the spatial separation of the core areas of distribution of the two species (Giménez et al, 2017).…”

Section: Discussion On Cetacean Distribution Maritime Traffic and Spa...supporting

confidence: 88%

“…The current study confirms that the central part of the Bay represents an important area for ‘common dolphins’ (Olaya‐Ponzone et al, 2022), especially from April to December, with a peak in presence during summer. This coincides with the peak in the presence of mothers with calves pods (Espada Ruíz et al, 2018) that are more vulnerable and prone to changes in behaviour (Castro et al, 2022).…”

Section: Discussion On Cetacean Distribution Maritime Traffic and Spa...supporting

confidence: 88%

“…Even though ‘striped dolphins’ have previously been spotted in mixed groups with common dolphins (Olaya‐Ponzone et al, 2022), the former were observed as having a wider distribution throughout the Strait. This result could coincide with the spatial separation of the core areas of distribution of the two species (Giménez et al, 2017).…”

Section: Discussion On Cetacean Distribution Maritime Traffic and Spa...mentioning

confidence: 90%

“…Species were grouped according to size (i.e., small, medium and large cetaceans), species association (i.e., bottlenose dolphin with pilot whale) and according to the potential risk of interaction with ships (e.g., fin and sperm whales). Common and striped dolphins were grouped as small cetaceans and were the species that were more frequent in the Bay (Elejabeitia et al, 2012; Olaya‐Ponzone et al, 2022). The pilot whales were grouped with the bottlenose dolphins, as they were often sighted associated in the Strait waters (Andréu et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

“…Common and striped dolphins were grouped as small cetaceans and were the species that were more frequent in the Bay (Elejabeitia et al, 2012;Olaya-Ponzone et al, 2022). The pilot whales were grouped with the bottlenose dolphins, as they were often sighted associated in the Strait waters (Andréu et al, 2008).…”

Section: Overlapping Cetacean Hot Spots Maritime Traffic High-risk Ar...mentioning

confidence: 99%

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Tying up loose ends together: Cetaceans, maritime traffic and spatial management tools in the Strait of Gibraltar

Scuderi,

Campana,

Gregorietti

et al. 2024

Aquatic Conservation

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The transboundary area of the Strait of Gibraltar is home to seven protected cetacean species that are threatened by high intensity of maritime traffic. More comprehensive knowledge of cetaceans and maritime traffic is required, together with analyses of legislations, strategies and policies. This study quantitatively investigates cetacean distribution and maritime traffic intensity and, for the species of community interest bottlenose dolphin, habitat suitability. Results are qualitatively discussed considering the overlap of cetacean hot spots with different maritime activities and the consistency of spatial conservation management measures in force. The Fixed Line Transect Mediterranean Monitoring Network protocols were followed for 59 visual surveys using ferries as observation platforms for monitoring cetaceans and maritime traffic. Surveys were carried out along the transects between Algeciras and Ceuta and between Algeciras and Tanger‐Med, in 2018 and 2019. 264 cetacean sightings, including seven different species and four near‐miss collision events (involving pilot, sperm and fin whales), were reported. Monitoring cetaceans from ferries in the Strait provided insights into cetacean distribution and maritime traffic, enabling the identification of cetacean hot spots, suitable habitats and maritime traffic high‐risk zones. A transboundary management effort is required, together with an adaptive approach for protecting highly mobile species such as cetaceans. Proposals include a long‐term cetacean monitoring program carried out by dedicated observers on board ferries as a cost‐effective methodology and mandatory training for crew members, to increase cetacean knowledge and reduce collision risk. The designation of an international temporal or, in some zones, permanent speed reduction area (i.e., Cetacean Critical Navigation Zone, with a maximum speed of 13 knots) and of a micro‐sanctuary with a seasonal no‐take zone in the Bay between Algeciras and Gibraltar, together with international surveillance, are recommended measures for the enhancement of conservation efforts in the Strait.

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Section: Discussion On Cetacean Distribution Maritime Traffic and Spa...supporting

confidence: 88%

Section: Discussion On Cetacean Distribution Maritime Traffic and Spa...supporting

confidence: 88%

Section: Discussion On Cetacean Distribution Maritime Traffic and Spa...mentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Overlapping Cetacean Hot Spots Maritime Traffic High-risk Ar...mentioning

confidence: 99%

See 3 more Smart Citations

Tying up loose ends together: Cetaceans, maritime traffic and spatial management tools in the Strait of Gibraltar

Scuderi,

Campana,

Gregorietti

et al. 2024

Aquatic Conservation

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Amphiatlantic Dolphins’ Prey: Indicators of Speciation, Trophic Competition and Global Warming? A Review

Olaya-Ponzone,

Ruíz,

Domínguez

et al. 2024

JMSE

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A review of the prey of three amphiatlantic dolphin species, Tursiops truncatus, Stenella coeruleoalba and Delphinus delphis, is carried out. The main objective of this work is to review the feeding of these species in the Atlantic in order to assess the degrees of trophic competition and speciation pressure. A total of 103 fish families, 22 cephalopod families and 19 crustacean families have been counted, from which the species identified to the genus level only included seventy-one fish, twenty cephalopods and five crustaceans, and the total species identified included three-hundred-one fish, fifty cephalopods and twenty-six crustaceans. The most consumed prey were fish, followed by cephalopods and crustaceans. The exclusive prey consumed by each of the three dolphin species, as well as those shared by all or at least two of them, have also been counted. T. truncatus is the most general; however, the western Atlantic populations exhibit high dietary specialization compared to the eastern Atlantic populations, reflecting strong speciation pressure on both sides of the Atlantic. D. delphis and S. coeruleoalba, despite their amphiatlantism, have hardly been studied in the western Atlantic, except for a few references in the southern hemisphere, so the fundamental differences between the two species and their comparison with T. truncatus have been established with records from the eastern Atlantic. All three dolphin species have been observed to be expanding, especially D. delphis. This northward expansion and that of their prey is discussed.

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Sport fishing and vessel pressure on the endangered cetacean Delphinus delphis. Towards an international agreement of micro-sanctuary for its conservation

Cited by 2 publications

References 56 publications

Tying up loose ends together: Cetaceans, maritime traffic and spatial management tools in the Strait of Gibraltar

Tying up loose ends together: Cetaceans, maritime traffic and spatial management tools in the Strait of Gibraltar

Amphiatlantic Dolphins’ Prey: Indicators of Speciation, Trophic Competition and Global Warming? A Review

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