Stranding patterns and feeding ecology of striped dolphins, Stenella coeruleoalba, in Western Iberia (1981–2014)

Marçalo, Ana; Giménez, Joan; Nicolau, Lídia; Frois, Jessica; Ferreira, Marisa; Sequeira, Marina; Eira, Catarina; Pierce, Graham J.; Vingada, José

doi:10.1016/j.seares.2021.101996

Cited by 10 publications

(12 citation statements)

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“…In the sample as a whole, myctophids, together with the silvery lanternfish, were the most represented in number (74% N) and in weight, despite their small size (30% W), followed by ommastrephid cephalopods (20% W), and by various fish (e.g., bogue 15% W, European hake 5% W, and gobiids 5% W), and other cephalopods. Surprisingly, we did not find blue whiting, as were found in adjacent waters (Marçalo et al, 2021), and the number of clupeids was very low (probably due to the rapid degradation of these otoliths).…”

Section: Discussioncontrasting

confidence: 71%

“…These results are consistent with the topography of the areas. In the Gulf of Cadiz, with a wide continental shelf, striped dolphins are expected to consume a greater variety of pelagic and demersal neritic species (Marçalo et al, 2021), contrary to what one might hypothesize for the Alboran Sea. However, the individuals stranded in the Gulf of Cadiz and the Alboran Sea do not necessarily belong to the Atlantic and Mediterranean subpopulations, respectively, since certain displacement of individuals between both sides of the Strait is assumed, and there could be also a mixture of individuals that feed in one area and end up stranding in the other due to the drift of the carcasses.…”

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

“…There has been only one previous study on the diet of striped dolphins based on the analysis of stomach contents in the south of the Iberian Peninsula, but this included only strandings in Portugal (Marçalo et al, 2021). In the Portuguese waters, the diet of striped dolphins is based mainly on sardine ( Sardina pilchardus ) and blue whiting ( Micromesistius poutassou ) (Marçalo et al, 2021). However, it is unknown if their diet is maintained along the Spanish Gulf of Cadiz and on the other side of the Strait of Gibraltar, in the Alboran Sea, which present different oceanographic characteristics and topography.…”

Section: Introductionmentioning

confidence: 99%

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Diet of striped dolphins (Stenella coeruleoalba) in southern Spanish waters

Saavedra

García-Polo

Giménez

et al. 2022

Marine Mammal Science

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Identifiable food remains were analyzed from 46 stomachs of striped dolphins (Stenella coeruleoalba) stranded in southern Spain between 2007 and 2014. Results suggest that the species feeds mainly on mesopelagic and neritic fish, but also on oceanic squids. Fish species of the family Myctophidae were the main prey in terms of numerical importance and reconstructed prey weight (62% N and 29% W), followed by squids of the family Ommastrephidae (20% W) and bogue (Boops boops) (15% W). The most important prey taxa according to the General Importance Index (GII) were C. maderensis, Ommastrephidae gen. spp., Notoscopelus spp., and M. punctatum. Higher number of mesopelagic myctophids were found in dolphins from the Mediterranean (73% vs. 29% N), while more demersal gobiids and European hake (Merluccius merluccius) were found in those from the Atlantic (44% vs. 1% and 8% vs. <1% N), where a more varied diet was also observed. Differences were also seen in the seasonal importance of some prey, as well as between years, sexes, and maturity states. The diet composition suggests that most of feeding occurred in oceanic regions, during twilight and night hours, while the observed dietary variation may reflect differences in topography, and changes in the prey availability.

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Section: Discussioncontrasting

confidence: 71%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diet of striped dolphins (Stenella coeruleoalba) in southern Spanish waters

Saavedra

García-Polo

Giménez

et al. 2022

Marine Mammal Science

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“…One study registered the presence of six species along a ∼30 km coast stretch in the western Algarve during a little over 8 months (Castro, 2010), while the other study reported the presence of 11 species along the entire region during 6-month periods over 10 years (Laborde et al, 2019). Existing knowledge is mostly published as gray literature, while peer-reviewed publications are scarce and have focused on strandings (Silva and Sequeira, 2003;Sousa and Brito, 2012), aspects of population connectivity (Alves et al, 2019;Dinis et al, 2021) the population ecology of Delphinus delphis (Moura et al, 2012;Castro et al, 2020), and Orcinus orca (Esteban et al, 2013) description of opportunistic observations (Martin and Walker, 1997;Báez et al, 2007), interaction with fisheries (Goetz et al, 2015;Marçalo et al, 2015), diet (Marçalo et al, 2018(Marçalo et al, , 2021 or diet/trophic ecology (Giménez et al, 2017), behavioral responses to drones (Castro et al, 2021), and epidemiology (Bento et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Harnessing the Power of Social Media to Obtain Biodiversity Data About Cetaceans in a Poorly Monitored Area

2021

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The study and conservation of cetaceans benefit from systematic studies and non-systematic records about sightings and strandings. However, iEcology (internet ecology) was critical for numerous ecological studies and should be in the toolkit of cetacean ecologists. We hypothesize that iEcology is irreplaceable to obtain diversity data about cetaceans in poorly monitored regions that coincide with touristic destinations, where whale-watching companies go out to sea regularly and post their sightings on social media. Our study assessed the advantages and disadvantages of iEcology while obtaining the first broadscale and long-term assessment about cetaceans’ diversity off the Algarve, a European tourist destination with numerous whale-watching companies. We retrieved 1,299 time-referenced records about 15 species posted on Facebook and Instagram between 2011 and 2020. Data collected from Biodiversity4All, an online citizen science biodiversity database, disclosed georeferenced records about nine species made between 2008 and 2020, however, the number of records was 15.8 times lower than social media posts. We obtained information about 16 species, two of which were never mentioned in the scientific literature [Balaenoptera musculus, Balaenoptera edeni (record made in 2021)] and five species were only mentioned in the gray literature. Previous assessments were restricted in time, published in the gray literature, and only reported six and 11 species. So, social media was essential to obtain the first broadscale and long-term assessment of cetaceans’ diversity off the Algarve. The main advantages of iEcology were the possibility to obtain data collected over one decade and its low cost. The main disadvantages are the impossibility to obtain georeferenced records from social media, the difficulty to estimate the number of individuals in large groups, and the presence of rare species can be inflated if multiple whale-watching companies report the same individual(s) while they migrate along the coast. Nonetheless, these disadvantages can be mitigated. Overall, we endorse the use of iEcology to increase the ecological knowledge about cetaceans which might be the only tool to study them in numerous regions across the world. The contributions of whale-watching companies are invaluable, so we recommend the implementation of a standardized cetacean observation log as a relevant source of data for conservation.

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Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018)

Dias

Marçalo

Feijó

et al. 2022

Aquatic Conservation

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1. Interactions between cetaceans and the purse seine fishery in coastal waters of mainland Portugal were investigated using onboard observations over a period of 15 years (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018). In 10% of the fishing sets, there were interactions with one of three species of cetaceans: common dolphin (Delphinus delphis), bottlenose dolphin (Tursiops truncatus), and harbour porpoise (Phocoena phocoena). The

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Stranding patterns and feeding ecology of striped dolphins, Stenella coeruleoalba, in Western Iberia (1981–2014)

Cited by 10 publications

References 60 publications

Diet of striped dolphins (Stenella coeruleoalba) in southern Spanish waters

Diet of striped dolphins (Stenella coeruleoalba) in southern Spanish waters

Harnessing the Power of Social Media to Obtain Biodiversity Data About Cetaceans in a Poorly Monitored Area

Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018)

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