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Journal articles on the topic 'Dolphin numbers'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Avila, Isabel Cristina, Carolina Garcia, and Juan Carlos Bastidas. "A note on the use of dolphins as bait in the artisanal fisheries off Bahía Solano, Chocó, Colombia." J. Cetacean Res. Manage. 10, no. 2 (2023): 179–82. http://dx.doi.org/10.47536/jcrm.v10i2.652.

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Dolphin hunting for fishing bait in Bahía Solano, Chocó, Colombia, was evaluated during eight months, between July 2005 and April 2006. Interviews were conducted with 122 fishermen (18.2% of the registered fishermen in the zone), who cover at most 890km2 when fishing (approximately 2.3% of the Pacific Territorial Sea of Colombia), and data obtained from landings at a fishing company. Only fishermen using longlines (37.3%) confirmed using dolphins as bait. It was not possible to obtain additional information about date, specific location or dolphin species, but the most probable captured specie

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Mills, Eliza M. M., Sarah Piwetz, and Dara N. Orbach. "Vessels Disturb Bottlenose Dolphin Behavior and Movement in an Active Ship Channel." Animals 13, no. 22 (2023): 3441. http://dx.doi.org/10.3390/ani13223441.

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Although the Port of Corpus Christi, Texas, has become a top oil exporter, it is unknown if local dolphins are disturbed by high year-round vessel traffic. A shore-based digital theodolite and automatic identification system receiver were used to record data to assess common bottlenose dolphin (Tursiops truncatus) behavioral states and movement patterns in the Corpus Christi Ship Channel (CCSC) in relation to vessel traffic. Multinomial logistic regression and generalized additive models were applied to analyze the data. Vessels were present within 300 m of dolphins during 80% of dolphin obser

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Pabst, D. A., A. S. Friedlaender, and W. A. McLellan. "Characterising an interaction between coastal bottlenose dolphins (Tursiops truncatus) and the spot gillnet fishery in southeastern North Carolina, USA." J. Cetacean Res. Manage. 3, no. 3 (2023): 293–303. http://dx.doi.org/10.47536/jcrm.v3i3.880.

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The aim of this study was to characterise interactions between coastal bottlenose dolphins (Tursiops truncatus Montagu, 1821), and the autumn gillnet fishery in southeastern North Carolina, USA that targets spot (Leiostomus xanthurus). Beach based (conducted from April 1997 - January 1998) and aerial surveys (conducted from July 1998 - May 1999) were used to estimate the abundance of dolphins and gillnets in nearshore waters. Commercial spot landings records from Brunswick County, North Carolina were used as an index of prey abundance. Stranded bottlenose dolphins were evaluated using protocol

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4

Dawson, Stephen M., and Elisabeth Slooten. "Management of gillnet bycatch of cetaceans in New Zealand." J. Cetacean Res. Manage. 7, no. 1 (2023): 59–64. http://dx.doi.org/10.47536/jcrm.v7i1.758.

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Bycatch of dolphins in inshore gillnets first attracted scientific and management attention in New Zealand in the 1980s. During 1984-88, 50-150 dusky dolphins were killed each year at Kaikoura in gillnets set at the surface to catch bait for rock lobster. At the same time, annual catches of 20-100 Hector’s dolphins occurred in Canterbury waters in bottom-set commercial and recreational gillnets. These catches resulted in the banning of surface-set gillnetting at Kaikoura in 1989 and in the creation of the Banks Peninsula Marine Mammal Sanctuary in 1988 to protect Hector’s dolphin. An additiona

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Baird, Ian G., and Isabel L. Beasley. "Irrawaddy dolphin Orcaella brevirostris in the Cambodian Mekong River: an initial survey." Oryx 39, no. 3 (2005): 301–10. http://dx.doi.org/10.1017/s003060530500089x.

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Irrawaddy dolphins Orcaella brevirostiris are found in coastal waters from the Bay of Bengal east to Palawan, Philippines and south to northern Australia. They also occur in three large tropical river systems in South-east Asia: the Mekong, Mahakam and Ayeyarwady. In March and May 1997 approximately 350 km of riverine habitat in parts of north-east Cambodia were surveyed, discussions took place with local people, and reported dry season dolphin habitat was mapped. Our objectives were to investigate the status, habitat and distribution of dolphins in north-east Cambodia and identify threats to

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6

Santana-Garcon, Julia, Corey B. Wakefield, Stacey R. Dorman, et al. "Risk versus reward: interactions, depredation rates, and bycatch mitigation of dolphins in demersal fish trawls." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 12 (2018): 2233–40. http://dx.doi.org/10.1139/cjfas-2017-0203.

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An improved understanding of interaction dynamics between dolphins and trawlers is essential for improving bycatch mitigation strategies. In-situ observations using video at increasing distances from the net opening during 50 commercial fish trawls, recorded 5908 common bottlenose dolphin (Tursiops truncatus (Montagu, 1821)) interactions and provided details on their duration, depredation rates, and behaviours. Dolphin interactions with trawls were very common (98% of day-trawls, 118 ± 16 interactions per trawl), with durations and prey consumption positively correlated with the distances vent

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7

Smith, Brian D., Isabel Beasley, Mariel Buccat, et al. "Status, ecology and conservation of Irrawaddy dolphins (Orcaella brevirostris) in Malampaya Sound, Palawan, Philippines." J. Cetacean Res. Manage. 6, no. 1 (2023): 41–52. http://dx.doi.org/10.47536/jcrm.v6i1.789.

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A geographically isolated population of Irrawaddy dolphins was recently discovered in Malampaya Sound, Palawan, Philippines. Line-transect surveys conducted in April-November 2001 covered 884km of trackline in the entire Sound and resulted in a total population estimate of 77 individuals (CV = 27.4%), confined to the inner portion (133.7km2 ). For all Irrawaddy dolphin sightings, where ecological data were collected (n = 48), the mean temperature was 30.2°C, depth 6.5m, salinity 28.3ppt and turbidity 2.2NTUs. Significantly higher turbidity, lower salinity and shallower depth were recorded in t

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De Pierrepont, J. F., B. Dubois, S. Desormonts, M. B. Santos, and J. P. Robin. "Stomach contents of English Channel cetaceans stranded on the coast of Normandy." Journal of the Marine Biological Association of the United Kingdom 85, no. 6 (2005): 1539–46. http://dx.doi.org/10.1017/s0025315405012762.

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During 1998–2003 stomach contents of 47 marine mammals stranded on the coast of Normandy were analysed. The animals were first examined by a veterinary network and stomach contents were analysed at the University of Caen. The sample comprised: 26 common dolphins (Delphinus delphis), four bottlenose dolphins (Tursiops truncatus), seven harbour porpoises (Phocoena phoecoena), five grey seals (Halichoerus grypus), two long-finned pilot whales (Globicephala melas), one white beaked dolphin (Lagenorhynchus albirostris), one minke whale (Balaenoptera acurostrata) and one striped dolphin (Stenella co

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Anderson, R. Charles. "Observations of cetaceans in the Maldives, 1990-2002." J. Cetacean Res. Manage. 7, no. 2 (2023): 119–35. http://dx.doi.org/10.47536/jcrm.v7i2.745.

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Cetaceans observed in Maldivian waters were recorded during the period August 1990 to June 2002, from both vessels-of-opportunity and dedicated cetacean-watching cruises. A total of 1,829 cetacean sightings were recorded during 535 days at sea (equivalent to 261 standardised days). There were 83 multispecies sightings, plus a further 58 sightings without associated effort data and 129 strandings were recorded by the author and others, making a total of 2,108 cetacean records. In all, 20 different species were positively identified from sightings. Spinner dolphins were the most abundant species

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Rossi-Santos, Marcos R., Leonardo L. Wedekin, and Emygdio L. A. Monteiro-Filho. "Residence and site fidelity of Sotalia guianensis in the Caravelas River Estuary, eastern Brazil." Journal of the Marine Biological Association of the United Kingdom 87, no. 1 (2007): 207–12. http://dx.doi.org/10.1017/s0025315407055683.

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Between April 2002 and April 2005, 210 estuarine dolphin groups were sighted, with 58 animals individually identified. Fifteen dolphins were photo-identified just once, while only two animals were sighted in 15 different months. Some individuals showed long-term residence (more than 3 y). Residence rates showed heterogeneity in the dolphin's permanence of the estuary, with 60% of the individuals with low numbers (<10) and only 7% showing high values for residence (maximum=45.9). Continued resightings of some dolphins support the regular use of the study area by the animals, despite some ind

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Sittig, Lisa, Uwe Römer, Cédric Gilleman, and Ney Gerver Gongora Torres. "Population numbers of Amazon river dolphins Inia geoffrensis and Sotalia fluviatilis (Mammalia: Cetaceae: Delphinidae) in the lower Río Tigre region, Loreto, Per\xc3\xba." Vertebrate Zoology 68 (November 20, 2018): 213–24. https://doi.org/10.3897/vz.68.e31607.

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We conducted a study to assess the populations of the two potentially endangered river dolphin species Inia geoffrensis and Sotalia fluviatilis in the river systems of the Río Tigre and the Río Marañon in the Peruvian Amazon region. Various observation methods were used and evaluated along ca. 353 kilometres of river and 134 to a maximum of 173 dolphins were recorded from 125 sightings and about 2000 photographs. Only about 10% of these dolphins could not be determined to species level, at least 57 individuals were identified as S. fluviatilis, and 89 individuals as I. geoffrensis. The abundan

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Shirakihara, Miki, and Kunio Shirakihara. "Bycatch of the Indo-Pacific bottlenose dolphin (Tursiops aduncus) in gillnet fisheries off Amakusa-Shimoshima Island, Japan." J. Cetacean Res. Manage. 12, no. 3 (2023): 345–51. http://dx.doi.org/10.47536/jcrm.v12i3.566.

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A year-round resident population of the Indo-Pacific bottlenose dolphin (Tursiops aduncus) inhabits the waters off Amakusa-Shimoshima Island (32°25′N, 130°05´E), in Japan. The effect of bycatch in gillnet fisheries on the Amakusa population was examined. Population size in 2007 and 2008 was estimated at 230 individuals (CV = 2.5%) and 216 individuals (CV = 2.1%), respectively, based on a mark-recapture technique. The magnitude of bycatch was evaluated by analysing interview surveys (263 gillnetters) during these two years. Minimum numbers of dolphin bycatch were 12 individuals in 2007 and 14 i

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Adamczak, S. K., C. Kemper, and I. Tomo. "Strandings of dolphins in the Adelaide Dolphin Sanctuary, South Australia." J. Cetacean Res. Manage. 19, no. 1 (2023): 105–11. http://dx.doi.org/10.47536/jcrm.v19i1.418.

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The Adelaide Dolphin Sanctuary was gazetted in 2005 to protect a resident population of Indo-Pacific bottlenose dolphins (Tursiops aduncus) thatlives in a heavily impacted urban environment. This study assesses the numbers and types of strandings before and after the creation of the sanctuary.Monitoring took place during 1987–2013, when 57 events were reported and 53 carcasses were examined by post-mortem. Events were assignedto a circumstance of death that combined post-mortem results and/or anecdotal information. The majority of records were Indo-Pacific bottlenosedolphins (n = 47, 82%) but

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Simard, Peter, Jennifer L. Lawlor, and Shannon Gowans. "Temporal Variability of Cetaceans near Halifax, Nova Scotia." Canadian Field-Naturalist 120, no. 1 (2006): 93. http://dx.doi.org/10.22621/cfn.v120i1.252.

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Annual and seasonal trends in sightings of coastal cetaceans near Halifax, Nova Scotia, were studied using observations from whale watching and dedicated research vessels from late spring to early fall of 1996 to 2005. Four species of cetaceans routinely used the area during the summer: White-beaked and Atlantic White-sided dolphins (Lagenorhynchus albirostris and L. acutus), Harbour Porpoises (Phocoena phocoena), and Minke Whales (Balaenoptera acutorostrata). The dolphin species were temporally separated, with White-beaked Dolphins being common earlier in the summer than White-sided Dolphins.

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15

Sittig, Lisa, Uwe Römer, Cédric Gilleman, and Ney Gerver Gongora Torres. "Population numbers of Amazon river dolphins Inia geoffrensis and Sotalia fluviatilis (Mammalia: Cetaceae: Delphinidae) in the lower Río Tigre region, Loreto, Perú." Vertebrate Zoology 68, no. 3 (2018): 213–24. http://dx.doi.org/10.3897/vz.68.e31607.

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We conducted a study to assess the populations of the two potentially endangered river dolphin species Inia geoffrensis and Sotalia fluviatilis in the river systems of the Río Tigre and the Río Marañon in the Peruvian Amazon region. Various observation methods were used and evaluated along ca. 353 kilometres of river and 134 to a maximum of 173 dolphins were recorded from 125 sightings and about 2000 photographs. Only about 10% of these dolphins could not be determined to species level, at least 57 individuals were identified as S. fluviatilis, and 89 individuals as I. geoffrensis. The abundan

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16

Torres, Leigh G., William A. McLellan, Erin Meagher, and D. Ann Pabst. "Seasonal distribution and relative abundance of bottlenose dolphins, Tursiops truncatus, along the US mid-Atlantic Coast." J. Cetacean Res. Manage. 7, no. 2 (2023): 153–61. http://dx.doi.org/10.47536/jcrm.v7i2.748.

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In the US mid-Atlantic, multi-disciplinary studies are underway to elucidate the complex stock structure of coastal bottlenose dolphins (Tursiops truncatus), as well as the degree of overlap between coastal and offshore ecotypes. In this study we use geo-referenced data, collected during aerial surveys in 2000-2002, to describe the distribution and relative abundance of bottlenose dolphins along the US midAtlantic coast. Two aerial survey designs were used: (1) onshore/offshore surveys out to 35 n.miles during winter from Georgia to Virginia; and (2) coastal surveys throughout the year along N

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Santos, M. B., G. J. Pierce, J. A. Learmonth, et al. "Strandings of striped dolphin Stenella coeruleoalba in Scottish waters (1992–2003) with notes on the diet of this species." Journal of the Marine Biological Association of the United Kingdom 88, no. 6 (2008): 1175–83. http://dx.doi.org/10.1017/s0025315408000155.

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During 1992–2003, 52 striped dolphin strandings were recorded in Scotland (UK). Although strandings were recorded in every month of the year, highest numbers were found in January–March and August. Striped dolphins were stranded all around the Scottish coast, but the majority were recovered from the west coast. Necropsies were carried out on 33 of these animals: 29 had live-stranded and cause of death was not established for four animals. Stomach contents were analysed for 20 animals: whiting and Trisopterus were the main prey species in the diet (both by number and by reconstructed biomass).

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Popov, Dimitar, and Galina Meshkova. "Cetacean Strandings along the Bulgarian Coast of the Black Sea in 2010–2022." Oceans 5, no. 3 (2024): 429–41. http://dx.doi.org/10.3390/oceans5030025.

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Cetacean strandings are valuable sources of data about their life history, health status, population trends, and impact of threats. We examined the strandings along the Bulgarian coast of the Black Sea for a period of 13 years from 2010 to 2022. A total of 1528 cetacean strandings of all three species inhabiting the basin were recorded: 1031 harbour porpoises Phocoena phocoena, 199 bottlenose dolphins Tursiops truncatus, 97 common dolphins Delphinus delphis, 19 delphinids and 182 unidentified. The highest numbers were observed in 2016 and 2022. Monthly peaks for harbour porpoise and bottlenose

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Würtz, M., and D. Marrale. "Food of striped dolphin, Stenella coeruleoalba, in the Ligurian Sea." Journal of the Marine Biological Association of the United Kingdom 73, no. 3 (1993): 571–78. http://dx.doi.org/10.1017/s0025315400033117.

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The stomachsof 23 striped dolphins (Stenella coeruleoalba Meyen, 1833, Cetacea), stranded along the Ligurian coast (western Mediterranean Sea), contained 32 species of cephalopods, crustaceans and fishes, totalling an estimated 2,723 prey specimens representing about 36 kg in weight. Cephalopods and bony fishes were equally important in the diet (50%). Todarodes sagittatus (34.5%) and Micromesistius poutassou (25.9%) were found to be the most important food species. Other species belonging to six cephalopod families, three crustacean families and nine bony fish families, contributed to the die

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Bejder, Lars, Amanda Hodgson, Neil Loneragan, and Simon Allen. "Coastal dolphins in north-western Australia: The need for re-evaluation of species listings and short-comings in the Environmental Impact Assessment process." Pacific Conservation Biology 18, no. 1 (2012): 22. http://dx.doi.org/10.1071/pc120022.

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LITTLE is known about the distribution, abundance and behavioural ecology of dolphins in the tropical north-west of Australia. This region is remote, and until recently, has had a relatively low human population. Two of Australia’s tropical coastal dolphin species, the Australian Snubfin Orcaella heinsohni and Indo-Pacific Humpback Dolphins Sousa chinensis (“Snubfin Dolphin” and “Humpback Dolphin”, hereafter) are known to occur in the region. Australia-wide, the only scientific publications on these two species come from a few studies from eastern Queensland, where both species live in “popula

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Gore, M. A., M. S. Kiani, E. Ahmad, et al. "Occurrence of whales and dolphins in Pakistan with reference to fishers’ knowledge and impacts." J. Cetacean Res. Manage. 12, no. 2 (2023): 235–47. http://dx.doi.org/10.47536/jcrm.v12i2.581.

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This paper reports the findings of a project (Cetacean Conservation Pakistan) launched in 2004 with a view to: (a) undertaking quantitative surveys to determine the variety and abundance of species present; (b) working with local fisher communities to collate local knowledge and promote public awareness; and (c) promoting a marine cetacean conservation strategy and measures. Boat-based surveys for live animals and shore surveys for beachcast specimens have confirmed the presence of twelve species of whale and dolphin. Among these bottlenose dolphins (Tursiops sp.) occur both inshore along the

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Nery, Mariana F., Mariana de A. Espécie, and Sheila M. Simão. "Site fidelity of Sotalia guianensis (Cetacea: Delphinidae) in Sepetiba Bay, Rio de Janeiro, Brazil." Revista Brasileira de Zoologia 25, no. 2 (2008): 182–87. http://dx.doi.org/10.1590/s0101-81752008000200004.

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Estuarine dolphins, Sotalia guianensis (Van Bénéden, 1864), were identified in Sepetiba Bay (22º35'S, 44º03'W), state of Rio de Janeiro, Brazil, between February 1994 and July 2006 using the photo-identification method. A total of 72 surveys resulted in the identification and cataloguing of 217 individual dolphins. Seventy-nine (36%) were resighted at least once during the study period. The average interval between resightings was 40,6 ± 31,1 months. Large numbers of mother-and-calf pairs were recorded during the 12 years and new individuals were frequently encountered in the photographic reco

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Frantzis, A., P. Alexiadou, G. Paximadis, E. Politi, A. Gannier, and M. Corsini-Foka. "Current knowledge of the cetacean fauna of the Greek Seas." J. Cetacean Res. Manage. 5, no. 3 (2023): 219–32. http://dx.doi.org/10.47536/jcrm.v5i3.801.

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From 1991-2002 data on the presence and distribution of cetaceans in the Greek Seas have been systematically collated in a database (821 sightings and 715 strandings). Data originated from dedicated surveys, stranding reports, opportunistic sightings and published or unpublished photographic and video documents. Twelve cetacean species have been recorded. Seven of them are permanently present and commonly observed in one or more of the Greek Seas: striped dolphin, common bottlenose dolphin, short-beaked common dolphin, Cuvier’s beaked whale, sperm whale, Risso’s dolphin and fin whale. In addit

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De Vos, A., R. Clark, C. Johnson, et al. "Cetacean sightings and acoustic detections in the offshore waters of Sri Lanka: March–June 2003." J. Cetacean Res. Manage. 12, no. 2 (2023): 185–93. http://dx.doi.org/10.47536/jcrm.v12i2.576.

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The Indian Ocean Sanctuary was established in 1979 in an effort to allow exploited stocks of whales to recover from whaling and to facilitate benign research. Further information is required to establish comprehensive management and conservation measures for species within these waters. The current study took place in the offshore waters of Sri Lanka in early 2003. During three research cruises conducted between 29 March and 17 June 2003 the R/V Odyssey covered a total track line of 4,480km around the island resulting in 52 confirmed group sightings of 11 species from three cetacean families.

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Balmer, Brian, T. Mcdonald, F. Hornsby, et al. "Long-term trends in a northern Gulf of Mexico common bottlenose dolphin (Tursiops truncatus) population in the wake of the Deepwater Horizon oil spill." J. Cetacean Res. Manage. 18, no. 1 (2018): 1–9. http://dx.doi.org/10.47536/jcrm.v18i1.409.

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Bottlenose dolphins along the northern Gulf of Mexico continue to be impacted by numerous stressors including harmful algal blooms, infectiousdisease epizootics, and oil exposure following the Deepwater Horizon (DWH) oil spill. Studies to assess the potential impacts of the DWH oil spillon dolphins in the northern Gulf of Mexico were initiated as part of a Natural Resource Damage Assessment and included photographic-identification(photo ID) surveys to determine abundance, density, and site fidelity in St. Joseph Bay, Florida (SJB). Although significant oiling did not occur inSJB, long-term dat

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Lin, Zhonglu, Ankang Gao, and Yu Zhang. "A Numerical Study of Flow Past a Wall-Mounted Dolphin Dorsal Fin at Low Reynolds Numbers." Biomimetics 9, no. 11 (2024): 682. http://dx.doi.org/10.3390/biomimetics9110682.

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Dolphin swimming has been a captivating subject, yet the dorsal fin’s hydrodynamics remain underexplored. In this study, we conducted three-dimensional simulations of flow around a wall-mounted dolphin dorsal fin derived from a real dolphin scan. The NEK5000 (spectral element method) was employed with a second-order hex20 mesh to ensure high simulation accuracy and efficiency. A total of 13 cases were simulated, covering angles of attack (AoAs) ranging from 0° to 60° and Reynolds numbers (Re) between 691 and 2000. Our results show that both drag and lift increase significantly with the AoA. Al

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Biswas, S. P. "Riverine health and the future of dolphins in northeastern India." Aquatic Ecosystem Health & Management 26, no. 1 (2023): 49–56. http://dx.doi.org/10.14321/aehm.026.01.49.

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Abstract The Gangetic Dolphin (Platanista gangetica) was once found in tens of thousands in the rivers of the Indian sub-continent, but the numbers have now dwindled abysmally throughout its geographical distribution. In northeastern India too, dolphins were seen in all the major rivers and also in certain wetlands during monsoon months till the early 1980s. However, the sighting of dolphins is rare now due to natural and human-induced factors. Three factors - adequate water cover, water quality, and abundance of prey food either individually or in combination- relate to River Dolphins’ existe

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Aguilar, Alex. "Population biology, conservation threats and status of Mediterranean striped dolphins (Stenella coeruleoalba)." J. Cetacean Res. Manage. 2, no. 1 (2000): 17–26. http://dx.doi.org/10.47536/jcrm.v2i1.485.

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The paper reviews the information available on those aspects of the biology, ecology and effects of human impact that are relevant to the management and conservation of striped dolphins in the Mediterranean Sea. The striped dolphin is common throughout the western Mediterranean, although it shows a preference for open waters beyond the continental shelf. In 1991, the western Mediterranean population was estimated as 117,880 (95% CI = 68,379-214,800), but no comparable estimates are available for the eastern basin. Geographical variation in body length, skull morphometrics and genetic analyses,

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Jansen, Okka E., Mardik F. Leopold, Erik H. W. G. Meesters, and Chris Smeenk. "Are white-beaked dolphins Lagenorhynchus albirostris food specialists? Their diet in the southern North Sea." Journal of the Marine Biological Association of the United Kingdom 90, no. 8 (2010): 1501–8. http://dx.doi.org/10.1017/s0025315410001190.

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The white-beaked dolphin Lagenorhynchus albirostris is the most numerous cetacean after the harbour porpoise Phocoena phocoena in the North Sea, including Dutch coastal waters. In this study, the diet of 45 white-beaked dolphins stranded on the Dutch coast between 1968 and 2005 was determined by analysis of stomach contents. Although 25 fish species were identified, the diet was dominated by Gadidae (98.0% by weight, 40.0% in numbers), found in all stomachs. All other prey species combined contributed little to the diet by weight (2.0%W). The two most important prey species were whiting Merlan

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Vollmer, Nicole L., Lee-Ann C. Hayek, Michael R. Heithaus, and Richard C. Connor. "Further evidence of a context-specific agonistic signal in bottlenose dolphins: the influence of consortships and group size on the pop vocalization." Behaviour 152, no. 14 (2015): 1979–2000. http://dx.doi.org/10.1163/1568539x-00003311.

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Pops are a low-frequency, pulsed vocalization produced by Indo-Pacific bottlenose dolphins (Tursiopscf.aduncus) in Shark Bay, Western Australia and are often heard when male alliances are consorting or ‘herding’ a female. Previous research indicated that pops produced in this context are an agonistic ‘come-hither’ demand produced by males and directed at female consorts. Here we examine pop occurrence during focal follows on bottlenose dolphin alliances with and without female consorts present. Regression analysis was conducted to determine if pop numbers were higher in the presence of female

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Iriarte, V., and M. Marmontel. "Insights on the use of dolphins (boto, Inia geoffrensis and tucuxi, Sotalia fluviatilis) for bait in the piracatinga (Calophysus macropterus) fishery in the western Brazilian Amazon." J. Cetacean Res. Manage. 13, no. 2 (2023): 163–73. http://dx.doi.org/10.47536/jcrm.v13i2.546.

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In the Amazon Basin, the use of the pink dolphin or boto (Inia geoffrensis) for bait in the piracatinga (Calophysus macropterus) fishery was first detected in the year 2000. Since then, this artisanal fishery has become more prevalent as it requires only a few hours of work per night and provides immediate cash earnings. It is thus an attractive addition to (or replacement for) traditional fishing. Previous reports have noted the use of botos as bait, but stated that the most common bait used are caimans (Melanosuchus niger, Caiman crocodilus). Estimates of the number of dolphins killed based

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Bassoi, Manuela, J. G. Shepard, and Eduardo R. Secchi. "Opportunistic feeding experiment in a captive franciscana (Pontoporia blainvillei): assessing gastrointestinal transit time and gastric digestion." Latin American Journal of Aquatic Mammals 13, no. 1-2 (2019): 15–22. http://dx.doi.org/10.5597/00244.

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The data consists of spreadsheets containing (i) otolith and cephalopod beak numbers and sizes, and the time of recovery for seven different prey species of different meals; (ii) conditions of prey structures for each meal and its time of recovery; and (iii) the times that the plastic colour markers were ingested and evacuated from a feeding experiment with a franciscana dolphin in captivity.

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Robbins, James R., Lucy Babey, and Clare B. Embling. "Citizen science in the marine environment: estimating common dolphin densities in the north-east Atlantic." PeerJ 8 (February 28, 2020): e8335. http://dx.doi.org/10.7717/peerj.8335.

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Background Citizen science is increasingly popular and has the potential to collect extensive datasets at lower costs than traditional surveys conducted by professional scientists. Ferries have been used to collect data on cetacean populations for decades, providing long-term time series for monitoring of cetacean populations. One cetacean species of concern is the common dolphin, which has been found stranded around the north-east Atlantic in recent years, with high numbers on French coasts being attributed to fisheries bycatch. We estimate common dolphin densities in the north-east Atlantic

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Pascoe, P. L. "Size data and stomach contents of common dolphins, Delphinus delphis, near Plymouth." Journal of the Marine Biological Association of the United Kingdom 66, no. 2 (1986): 319–22. http://dx.doi.org/10.1017/s002531540004296x.

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INTRODUCTIONThe laboratory at Plymouth was notified of the capture of five dolphins in a commercial trawl on 9 December 1982, three of the specimens were living and therefore immediately released. The remaining two were brought to the laboratory, identified as Delphinus delphis Linnaeus, 1758, their size and sex were recorded and the stomachs removed for examination of their contents. The exact location of capture was not recorded, but is known to be within 40 miles of Plymouth.Reports of strandings of D. delphis collected by the British Museum (Natural History), (Harmer, 1914–27; Fraser, 1934

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Uluduz, Nastassia, Alexey Yanchukov, and Mustafa Sözen. "Seasonal dynamics of occurrence and group size of three species of cetaceans (Delphinidae and Phocoenidae) on the southwestern coast of the Black Sea." Scientia Marina 84, no. 4 (2020): 431–39. http://dx.doi.org/10.3989/scimar.05086.21a.

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The spatial and temporal occurrence of cetaceans in the Black Sea and particularly along its southwestern coastline is poorly studied. Based on a total of 609 encounters, we present the analysis of monthly dynamics of (1) the numbers of cetacean sightings and (2) their group size for all three Black Sea cetacean species: the bottlenose dolphin (Tursiops truncatus), the short-beaked common dolphin (Delphinus delphis) and the harbour porpoise (Phocoena phocoena) over a continuous period of 29 months (January 2018 - May 2020) from two fixed coastal observation points near the city of Zonguldak, T

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Pierpoint, Chris, Liz Allan, Holly Arnold, et al. "Monitoring important coastal sites for bottlenose dolphin in Cardigan Bay, UK." Journal of the Marine Biological Association of the United Kingdom 89, no. 5 (2009): 1033–43. http://dx.doi.org/10.1017/s0025315409000885.

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From 1994–2007 Ceredigion County Council and a network of shore-based, volunteer observers monitored levels of boat traffic and the occurrence of bottlenose dolphins Tursiops truncatus at seven sites on the coast of Cardigan Bay, Wales. We report high rates of site use and site occupancy by this species during the summer: at Mwnt for example, dolphins were recorded in >80% of 2 hours' observation periods; and at New Quay Harbour dolphins were present in >30% of all 15-minute intervals. At Mwnt and Aberporth there was a significant annual trend for increasing sighting rates; at Ynys Locht

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Tonay, Arda M. "Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008." Journal of the Marine Biological Association of the United Kingdom 96, no. 4 (2016): 993–98. http://dx.doi.org/10.1017/s0025315416000060.

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This is the first study estimating cetacean by-catch in the Turkish western Black Sea turbot fishery. One turbot fishing boat was observed during two fishing seasons, from April through July 2007 and April through mid-September 2008. During this time, 24 harbour porpoises and one bottlenose dolphin were caught in turbot trammel nets. The by-catch rate was found to be 0.18 for harbour porpoise and 0.01 for bottlenose dolphin individuals per kilometre in 2007, and 0.19 for harbour porpoise individuals in 2008. It is estimated that the total numbers of harbour porpoises killed in the Turkish west

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Engelhaupt, Amy, Thomas A. Jefferson, Jessica M. Aschettino, and Joel T. Bell. "Distribution, abundance and sighting patterns of multiple stocks of bottlenose dolphins (Tursiops truncatus) in coastal Virginia waters." J. Cetacean Res. Manage. 23, no. 1 (2022): 109–25. http://dx.doi.org/10.47536/jcrm.v23i1.222.

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Three stocks of bottlenose dolphins (Tursiops truncatus) are currently known to co‐occur in the coastal waters off Virginia. A combination of visual line‐transect survey and photo‐identification (photo‐ID) methods was used to gather information on the occurrence, distribution and density of bottlenose dolphins in the coastal areas of Norfolk and Virginia Beach. Sixty‐one line‐transect surveys were completed in two zones (inshore and offshore) between August 2012 and August 2015, with on‐effort coverage of 6,550 kilometres (km) of trackline over 349.6 hours. Conventional line‐transect analysis

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Secchi, Eduardo R., Daniel Danilewicz, and Paula H. Ott. "Applying the phylogeographic concept to identify franciscana dolphin stocks: implications to meet management objectives." J. Cetacean Res. Manage. 5, no. 1 (2023): 61–68. http://dx.doi.org/10.47536/jcrm.v5i1.827.

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High numbers of franciscanas (Pontoporia blainvillei) have been bycaught in gillnets for at least four decades. The impact is strong but not homogeneous along the species distribution range, and there is evidence that at least one local population is declining. Reliable stock determination is important to evaluate how bycatch affects stocks so that they can be preserved through local management actions. Following the phylogeographic approach of Dizon et al. (1992), which applies a hierarchical classification scheme to stock designations, available information relevant for franciscana stock dis

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McFarlane, Keri, Anne Gunn, Mitch Campbell, Mathieu Dumond, Jan Adamczewski, and Greg Wilson. "Genetic diversity, structure and gene flow of migratory barren-ground caribou (Rangifer tarandus groenlandicus) in Canada." Rangifer 36, no. 1 (2016): 1. http://dx.doi.org/10.7557/2.36.1.3577.

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Migratory barren-ground caribou (Rangifer tarandus groenlandicus) provide an opportunity to examine the genetic population structure of a migratory large mammal whose movements and distribution, in some instances, have not been heavily influenced by human activities that result in habitat loss or fragmentation. These caribou have likely reached large effective population sizes since their rapid radiation during the early Holocene despite cyclic changes in abundance. Migratory barren-ground caribou are managed as discrete subpopulations. We investigated genetic variation among those subpopulati

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Hidaka-Umetsu, Mitsuko, and Dhugal J. Lindsay. "Comparative ROV surveys reveal jellyfish blooming in a deep-sea caldera: the first report of Earleria bruuni from the Pacific Ocean." Journal of the Marine Biological Association of the United Kingdom 98, no. 8 (2017): 2075–85. http://dx.doi.org/10.1017/s0025315417001540.

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Large numbers of the leptomedusa Earleria bruuni were observed inside a semi-closed deep-sea caldera during a comparative survey of the macrozooplankton fauna inside and outside the Kurose Hole, Izu-Ogasawara Islands, by the remotely operated vehicle (ROV) ‘Dolphin-3K’, on 24 September 2000. The Kurose Hole is an inactive volcanic caldera of 790 m bottom depth, located within the Izu-Bonin island arc, south of Tokyo. Archived video and audio data from a dive by the human-occupied vehicle (HOV) ‘Shinkai 2000’, carried out 3 weeks after the ROV dives, was also analysed. During all dives within t

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Morris, Sinead E., Jonathan L. Zelner, Deborah A. Fauquier, et al. "Partially observed epidemics in wildlife hosts: modelling an outbreak of dolphin morbillivirus in the northwestern Atlantic, June 2013–2014." Journal of The Royal Society Interface 12, no. 112 (2015): 20150676. http://dx.doi.org/10.1098/rsif.2015.0676.

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Morbilliviruses cause major mortality in marine mammals, but the dynamics of transmission and persistence are ill understood compared to terrestrial counterparts such as measles; this is especially true for epidemics in cetaceans. However, the recent outbreak of dolphin morbillivirus in the northwestern Atlantic Ocean can provide new insights into the epidemiology and spatio-temporal spread of this pathogen. To deal with uncertainties surrounding the ecology of this system (only stranded animals were observed), we develop a statistical framework that can extract key information about the under

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Ferrari, Thomas E. "Cetacean beachings correlate with geomagnetic disturbances in Earth's magnetosphere: an example of how astronomical changes impact the future of life." International Journal of Astrobiology 16, no. 2 (2016): 163–75. http://dx.doi.org/10.1017/s1473550416000252.

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AbstractThe beaching and stranding of whales and dolphins around the world has been mystifying scientists for centuries. Although many theories have been proposed, few are substantiated by unequivocal statistical evidence. Advances in the field of animal magnetoreception have established that many organisms, including cetaceans, have an internal ‘compass,’ which they use for orientation when traveling long distances. Astrobiology involves not only the origin and distribution of life in the universe, but also the scientific study of how extraterrestrial conditions affect evolution of life on pl

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Gopal, Jaya Madana, Giovanni Tretola, Robert Morgan, Guillaume de Sercey, Andrew Atkins, and Konstantina Vogiatzaki. "Understanding Sub and Supercritical Cryogenic Fluid Dynamics in Conditions Relevant to Novel Ultra Low Emission Engines." Energies 13, no. 12 (2020): 3038. http://dx.doi.org/10.3390/en13123038.

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In this paper we provide insight into the thermophysical properties and the dynamics of cryogenic jets. The motivation of the work is to optimise the use of cryogenic fluids in novel ultra low emission engines. For demonstration, we use conditions relevant to an internal combustion engine currently being developed by Dolphin N2 and the University of Brighton, the CryoPower recuperated split cycle engine (RSCE). The principle of this engine is a split-cycle combustion concept which can use cryogenic injection in the compression cylinder to achieve isothermal compression and thus help maximise t

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March, Duane T., Kimberly Vinette-Herrin, Andrew Peters, et al. "Hematologic and biochemical characteristics of stranded green sea turtles." Journal of Veterinary Diagnostic Investigation 30, no. 3 (2018): 423–29. http://dx.doi.org/10.1177/1040638718757819.

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To improve understanding of pathophysiologic processes occurring in green sea turtles ( Chelonia mydas) stranded along the east coast of Australia, we retrospectively examined the hematologic and biochemical blood parameters of 127 green turtles admitted to 2 rehabilitation facilities, Dolphin Marine Magic (DMM) and Taronga Zoo (TZ), between 2002 and 2016. The predominant size class presented was small immature animals (SIM), comprising 88% and 69% of admissions to DMM and TZ, respectively. Significant differences in blood profiles were noted between facility, size, and outcome. Elevated level

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Thomson, C. A., and J. R. Geraci. "Cortisol, Aldosterone, and Leucocytes in the Stress Response of Bottlenose Dolphins, Tursiops truncatus." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 5 (1986): 1010–16. http://dx.doi.org/10.1139/f86-125.

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The activity associated with capturing, restraining, and removing bottlenose dolphins, Tursiops truncatus, from water stimulates a stress response as reflected by circulating cortisol, aldosterone, and eosinophils. Serum cortisol increased from resting levels of about 30 to 110 nmol/L within 1 h, aldosterone rose from less than 280 pmol/L to up to 1880 pmol/L within 3 h, and circulating eosinophils were depressed to less than 40% of their initial numbers within 7 h after the animals were removed from water (calm-capture). This basic response was not enhanced when the capture procedure was prol

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van der Schaar, M., E. Delory, J. van der Weide, et al. "A comparison of model and non-model based time-frequency transforms for sperm whale click classification." Journal of the Marine Biological Association of the United Kingdom 87, no. 1 (2007): 27–34. http://dx.doi.org/10.1017/s0025315407049508.

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We tried to find discriminating features for sperm whale clicks in order to distinguish between clicks from different whales, or to enable unique identification. We examined two different methods to obtain suitable characteristics. First, a model based on the Gabor function was used to describe the dominant frequencies in a click, and then the model parameters were used as classification features. The Gabor function model was selected because it has been used to model dolphin sonar pulses with great precision. Additionally, it has the interesting property that it has an optimal time–frequency

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A. Crespo, Enrique, Mariano Koen-Alonso, Silvana Laura Dans, et al. "Incidental catches of dolphins in mid-water trawls for Argentine anchovy (Engraulis anchoita) off the Argentine shelf." J. Cetacean Res. Manage. 2, no. 1 (2000): 11–16. http://dx.doi.org/10.47536/jcrm.v2i1.484.

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Information on the incidental mortality of dusky and common dolphins in mid-water trawl fisheries along the Argentine shelf was obtained for the 1990s. The Argentine anchovy is believed to be an under-exploited resource and is usually taken in purse seine fisheries. However, on the few occasions when it was the target species of large mid-water trawlers, anchovy-eating dolphins were incidentally caught. A few incidents accounted for relatively high numbers of dolphins but in most of the cases the information obtained was insufficient for detailed analysis. For three cases, however, sufficient

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Gladilina, E. V., K. A. Vishnyakova, O. O. Neprokin, et al. "Linear Transect Surveys of Abundance and Density of Cetaceans in The Area Near the Dzharylgach Island in the North-Western Black Sea." Vestnik Zoologii 51, no. 4 (2017): 335–42. http://dx.doi.org/10.1515/vzoo-2017-0038.

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Abstract The first assessment of cetacean density and abundance by linear transect survey was conducted in 2016 and 2017 in the shallowest coastal area of the Ukrainian sector of the north-western Black Sea, in the Dzharylgach Gulf and the northern Karkinit Gulf, total area up to 259 km2. Three cetacean species were found present in the area in summer, and the harbour porpoise was the most abundant species with the abundance of at least a few hundred animals (estimated as 175 individuals in the Dzharylgach Gulf), whereas the common dolphins (59) and bottlenose dolphins (31) were present in les

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Fernández-Contreras, M. M., L. Cardona, C. H. Lockyer, and A. Aguilar. "Incidental bycatch of short-beaked common dolphins (Delphinus delphis) by pairtrawlers off northwestern Spain." ICES Journal of Marine Science 67, no. 8 (2010): 1732–38. http://dx.doi.org/10.1093/icesjms/fsq077.

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Abstract M. M. Fernández-Contreras, L. Cardona, C. H. Lockyer, and A. Aguilar. 2010. Incidental bycatch of short-beaked common dolphins (Delphinus delphis) by pairtrawlers off northwestern Spain. – ICES Journal of Marine Science, 67: 1732–1738. The numbers of short-beaked common dolphins captured annually by pairtrawlers operating off Galicia (northwestern Spain) and the operational factors influencing the bycatch were evaluated using on-board observations. Hauling time, fishing depth, and season of the year were identified as the key factors involved in the incidental capture. The dolphins we

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