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Atlantic white-sided dolphin

January 31, 2023

See also: Pacific white-sided dolphin

The Atlantic white-sided dolphin (Lagenorhynchus acutus) is a distinctively coloured dolphin found in the cool to temperate waters of the North Atlantic Ocean.

Atlantic white-sided dolphin
Size compared to an average human
CITES Appendix II (CITES)[2]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Family: Delphinidae
Genus: Lagenorhynchus
Gray, 1846
Species:
L. acutus
Binomial name
Lagenorhynchus acutus
(Gray, 1828)
  Atlantic white-sided dolphin range

Description

 
An Atlantic white-sided dolphin off the coast of Cape Ann, Massachusetts

The dolphin is slightly larger than most other oceanic dolphins. It is just over a meter in length at birth, growing to about 2.8 m (9.2 ft) (males) and 2.5 m (8.2 ft) (females) at maturity.[3] It weighs 180–230 kg (400- 510 lb) once fully-grown.[3] Females reach sexual maturity at between 6 and 12 years, and males between 7 and 11 years.[4][5] The gestation period is 11 months and lactation lasts for about 18 months — both typical figures for dolphins.[3] Individuals are known to live for at least 17 years.[3]

The key distinguishing feature is the white to pale yellow patch found behind the dorsal fin of the dolphin on each side.[3] This colour variation is unique amongst the mixtures of white, greys and blues of other pelagic cetaceans.[3] The rest of the body's coloration is well demarcated: the chin, throat and belly are white; the flippers, dorsal fin and back are dark grey to black with the exception of the yellow patch; there is a further white patch below the dorsal fin, lying above a light grey stripe that runs from the beak, above the eye and down to the tail stock.[3]

Dolphin group sizes vary by location, with groups averaging 60 in number close to the Newfoundland shores, but rather smaller east of Iceland.[3] From the analysis of the stomach contents of stranded animals, fish such as herring and mackerel and squid appear to form the species' main diet.[3] The Atlantic white-sided dolphin is fairly acrobatic and keen to interact with boats, however it is not as wildly gregarious as the white-beaked and common dolphins.[3]

Geographic range and distribution

The species is endemic to the North Atlantic Ocean.[3] The distribution limits are Norwegian sea in the north east; Davis Strait in the north west; North Carolina in the south west and Celtic Sea in the south east (possible range extension to the Azores).[3] Areas of particularly high population density include the shores of Newfoundland and Cape Cod, the triangular area of sea between the United Kingdom, Iceland and Greenland and the North Sea.[6][7][8][9] In 2008, sightings of Atlantic white-sided dolphins as well as the melon-headed whale were documented in South Carolina after a few stranding had taken place in the area at the time.[10] The species tends to occur in continental shelf waters, around 100m depth.[11] They show preference toward areas with steep slopes and canyons.[12][13] They are more likely to be observed in cold, less saline waters but it is unclear whether it is due to preference or if these factors influence prey distribution.[14][15]

Behaviour

Foraging

The diet of Atlantic white-sided dolphins includes mainly herring, hake and squid.[3] However, they consume a large variety of prey including small mackerel and various bottom fish.[3] They have been observed to cooperatively hunt on the surface.[3] It has been suggested that larger groups split while feeding.[12]

Social Behaviour

Like all species of the dolphin family, Atlantic white-sided dolphins are very social animals. Often traveling in large pods and displaying aerial behaviors as they travel.[16] The group size varies from several dozen to several hundreds individuals with average size around 50.[17] However, there seems to be little relatedness between the members of the group. Studies in different parts of the distribution range found that individuals were mainly unrelated to each other.[18][19] Juveniles spend at least some time in separate groups than adults.[3] Atlantic white-sided dolphins jump and breach more frequently when in larger groups thus this behaviour might have a social context.[16] They have a wide vocal repertoire which includes squeals, whistles, clicks and buzzes.[17][20] It is suggested that vocalisation is used for communication as noise production increases during socialising.[20]

Despite being docile creatures, even known to interact with various species of cetacean in a nonviolent manner, most notably with the long-finned pilot whale (Globicephala melas),[21] they have also been known to display violent behavior towards harbor porpoises, attacking them until they eventually succumb to their wounds, a similar behavior observed in bottlenose dolphins.[22][23]

Migration

Atlantic white-sided dolphins do not undertake specific seasonal migration.[12] However, they do move within their home range following prey distribution.[12] For example, in the waters off eastern North America this species moves southwards in winter and spring.[3][8]

Reproduction

Most of the calves are born around June and July.[3] The gestation period is 11 months and lactation around 18 months.[3] The birth interval varies between 1–3 years.[11]

Females reach sexual maturity around the age of 6–12 years.[4] Males reach sexual maturity around 7–11 years.[5] The reproduction is most likely seasonal, beginning in February, as some studies have identified dormant testes in some males.[5] 

Taxonomy

The Atlantic white-sided dolphin was named by John Edward Gray in 1828. The specific name acutus comes from the Latin for 'pointed' and refers to the sharply pointed dorsal fin.[3] It is traditionally placed in the genus Lagenorhynchus, but there is consistent molecular evidence that supports the Atlantic white-sided dolphin and the white-beaked dolphin as basal members of the family Delphinidae and not closely related.[24] It has therefore been proposed to move the Atlantic white-sided dolphin to its own genus, Leucopleurus.[25]

Population status

The estimations for the U.S. shelf and shelf-edge water suggest that the population size is about 300,000.[3] Additional 120,000 individuals have been estimated to spend summer in the Gulf of St.Lawrence.[3] In the eastern North America waters the numbers increase southwards in winter and spring in association with cold waters from the Gulf of Maine.[3] Two projects attempted to estimate the population trends - multinational Small Cetacean Abundance in the North Sea and Adjacent Waters (SCANS) survey project and the North Atlantic Sightings Survey (NASS). SCANS surveys, however, failed to produce species specific estimation as it combined both white-sided and white-beaked dolphins. NASS surveys did not indicate any population trends.

Threats

 
Hvalba, Faroe Islands in August 2006

Whaling

Historically, Atlantic white-sided dolphins were killed in drives conducted from Norway and Newfoundland.[26] These have ceased in recent years, although they still occur to a lesser extent from the Faroe Islands, where the meat and blubber are in high regard as food.[27] Reported catches in the years vary, though individual years suddenly stand out, such as in 2002, where the number reported killed was 773,[28] and in 2017, when 488 were killed.[27] In September 2021, a large pod of 1,428 animals was herded in Skálafjördur and killed.[29]

Annual number taken of white-sided dolphin in the Faroe Islands in the period 1980-2009 [28]
Year No/yr drive/yr Year No/yr drive/yr Year No/yr drive/yr
1980 8 1 1993 377 6 2001 546 7
1983 10 1 1994 263 7 2002 773 10
1985 32 1 1995 157 4 2003 186 5
1986 185 4 1996 357 7 2004 333 5
1987 76 2 1997 350 10 2005 312 4
1988 603 4 1998 438 4 2006 622 8
1990 55 2 1998 438 4 2008 1 1
1992 47 3 2000 265 3 2009 171 5

Entanglement and by catch

Atlantic white-sided dolphins have also been killed in incidental catch situations in the fishing industry. Such occurrences have been reported in Canada, United States, United Kingdom and Ireland.[30] Between 1977 and 1988, 13 Atlantic white-sided dolphins were reported as being incidentally caught in the Northeastern United States by U.S fisheries observers, 11 of these in Mackerel fisheries.[31] They have also been reported to get caught  in pelagic or near surface trawl or drift nets.[12][17]

Noise

Any anthropogenic underwater noise is a potential disturbance to Atlantic white-sided dolphins as they use sounds to communicate and catch prey.[20] Survey done in the UK showed that the sighting rate of Atlantic white-sided dolphins declines when airguns were firing compared to when they were not.[20]

Pollution

Persistent organic pollutants (POPs) such as PCBs and organochlorine pesticides (e.g. DDT, DDE) and polybrominated diphenyl ether (PBDE) flame retardants have been identified in body tissues of Atlantic white-sided dolphins throughout their range.[7][32][33][34] Males had higher levels of PCBs suggesting that females pass some of the contamination to offspring during lactation[30]. Similarly to other species, studies have identified heavy metals in Atlantic white-sided dolphins including cadmium levels higher than in other dolphin species in southern latitudes.[35] The full effect of this contamination is currently unknown.

Conservation status

The International Union of the Conservation of Nature (IUCN) currently classifies Atlantic white-sided dolphins as Least Concern.[30]

The North and Baltic Sea populations of the Atlantic white-sided dolphin are listed on Appendix II [36] of the Convention on the Conservation of Migratory Species of Wild Animals (CMS). They are listed on Appendix II[36] as they have an unfavourable conservation status or would benefit significantly from international co-operation organised by tailored agreements.[37] These species of dolphin are known to fall victims to in a polluted environment, a study from 1997 confirmed that the British and Irish populations of Atlantic white-sided dolphins to succumb to these effects.[7][38]

In addition, the Atlantic white-sided dolphin is covered by the Agreement on the Conservation of Small Cetaceans of the Baltic, North East Atlantic, Irish and North Seas (ASCOBANS).[39]

See also

References

  1. ^ Hammond, P.S.; Bearzi, G.; Bjørge, A.; Forney, K.; Karczmarski, L.; Kasuya, T.; Perrin, W.F.; Scott, M.D.; Wang, J.Y.; Wells, R.S.; et al. (2008). "Lagenorhynchus acutus". IUCN Red List of Threatened Species. 2008: e.T11141A3255721. doi:10.2305/IUCN.UK.2008.RLTS.T11141A3255721.en. Database entry includes a brief justification of why this species is of least concern.
  2. ^ "Appendices | CITES". cites.org. Retrieved 14 January 2022.
  3. ^ a b c d e f g h i j k l m n o p q r s t u v w Reeves, Randall (2008). Guide to Marine Mammals of the World. New York: National Audubon Society. pp. 398–401. ISBN 978-0375411410.
  4. ^ a b Sergeant (1980). "Life history and northwest Atlantic status of the Atlantic white-sided dolphin, Lagenorhynchus acutus". Cetology. 37: 1–12.
  5. ^ a b c Neuenhagen (2007). "Histology and morphometrics of testes of the white-sided dolphin (Lagenorhynchus acutus) in bycatch samples from the Northeastern Atlantic". Mammalian Biology. 72 (5): 283–298. doi:10.1016/j.mambio.2006.10.008.
  6. ^ Schevill, W. E. (1956). "Lagenorhynchus acutus off Cape Cod". Journal of Mammalogy. 37 (1): 128–129. doi:10.2307/1375559. JSTOR 1375559.
  7. ^ a b c Mckenzie, C.; Rogan, E.; Reid, R.; Wells, D. (1997). "Concentrations and patterns of organic contaminants in Atlantic white-sided dolphins (Lagenorhynchus acutus) from Irish and Scottish coastal waters". Environmental Pollution. 98 (1): 15–27. doi:10.1016/s0269-7491(97)00109-7. PMID 15093341.
  8. ^ a b Weinrich, Mason T.; Belt, Cynthia R.; Morin, David (April 2001). "Behavior and Ecology of the Atlantic White-Sided Dolphin (Lagenorhynchus Acutus) in Coastal New England Waters". Marine Mammal Science. 17 (2): 231–248. doi:10.1111/j.1748-7692.2001.tb01268.x. ISSN 0824-0469.
  9. ^ Schevill, William E. (February 1956). "Lagenorhynchus acutus off Cape Cod". Journal of Mammalogy. 37 (1): 128–129. doi:10.2307/1375559. ISSN 0022-2372. JSTOR 1375559.
  10. ^ Powell, J.W.; Rotstein, D.S.; Mcfee, W.E. (2012). "First Records of the Melon-Headed Whale (Peponocephala electra) and the Atlantic White-Sided Dolphin (Lagenorhynchus acutus) in South Carolina". Southeastern Naturalist. 11 (1): 23–34. doi:10.1656/058.011.0102. S2CID 83544895.
  11. ^ a b Waring (2006). "U.S. Atlantic and Gulf of Mexico marine mammal stock assessments – 2005". NOAA Technical Memorandum NMFS-NE. 194: 346.
  12. ^ a b c d e Gaskin (1992). "Status of the Atlantic white-sided dolphin, Lagenorhynchus acutus, in Canada". Canadian Field-Naturalist. 106: 64–72.
  13. ^ Palka (1997). "Summary of knowledge of white-sided dolphins (Lagenorhynchus acutus) from US and Canadian Atlantic waters". Report of the International Whaling Commission. 47: 729–734.
  14. ^ Selzer (1988). "The distribution of white-sided (Lagenorhynchus acutus) and common dolphins (Delphinus delphis) vs. environmental features of the continental shelf of the northeastern United States". Marine Mammal Science. 4 (2): 141–153. doi:10.1111/j.1748-7692.1988.tb00194.x.
  15. ^ Doksæter (2008). "Distribution and feeding ecology of dolphins along the Mid-Atlantic ridge between Iceland and the Azores". Deep-Sea Research Part II: Topical Studies in Oceanography. 55 (1–2): 243–253. Bibcode:2008DSRII..55..243D. doi:10.1016/j.dsr2.2007.09.009.
  16. ^ a b Weinrich, M.T.; Belt, C.R.; Dorin, D. (2001). "Behavior And Ecology Of The Atlantic White-Sided Dolphin (Lagenorhynchus acutus) In Coastal New England Waters". Marine Mammal Science. 17 (2): 231–248. doi:10.1111/j.1748-7692.2001.tb01268.x.
  17. ^ a b c Reeves (1999). "Atlantic white-sided dolphin Lagenorhynchus acutus (Gray, 1828). In S. H. Ridgway and R. Harrison (eds.)". Handbook of Marine Mammals. 6: 31–56.
  18. ^ Mirimin (2011). "Insights into genetic diversity, parentage, and group composition of Atlantic white-sided dolphins (Lagenorhynchus acutus) off the West of Ireland based on nuclear and mitochondrial genetic markers". Journal of Heredity. 102 (1): 79–87. doi:10.1093/jhered/esq106. hdl:10379/12915. PMID 21059883.
  19. ^ Fernández (2016). "A genomewide catalogue of single nucleotide polymorphisms in white-beaked and Atlantic white-sided dolphins". Molecular Ecology Resources. 16 (1): 266–276. doi:10.1111/1755-0998.12427. PMID 25950249. S2CID 8129929.
  20. ^ a b c d Hamran (2014). "Distribution and vocal behavior of Atlantic white-sided dolphins (Lagenorhynchus acutus) in northern Norway". University of Nordland.
  21. ^ Baraff, L. S.; Asmutis-Silvia, R. A. (1998). "Long-Term Association of an Individual Long-Finned Pilot Whale and Atlantic White-Sided Dolphins". Marine Mammal Science. 14 (1): 155–161. doi:10.1111/j.1748-7692.1998.tb00700.x.
  22. ^ Larrat, S.; Measures, L.; Stephane, L. (2012). "Short Note Rake Marks on a Harbor Porpoise (Phocoena phocoena) Calf Suggestive of a Fatal Interaction with an Atlantic White-Sided Dolphin (Lagenorhynchus acutus)". Aquatic Mammals. 38 (1): 86–91. doi:10.1578/am.38.1.2012.86.
  23. ^ Ross, H.M.; Wilson, B. (1996). "Violent interactions between Bottlenose dolphins and Harbour porpoises". Proceedings of the Royal Society B: Biological Sciences. 263 (1368): 283–286. Bibcode:1996RSPSB.263..283R. doi:10.1098/rspb.1996.0043. S2CID 85372260.
  24. ^ McGowen, Michael R; Tsagkogeorga, Georgia; Álvarez-Carretero, Sandra; dos Reis, Mario; Struebig, Monika; Deaville, Robert; Jepson, Paul D; Jarman, Simon; Polanowski, Andrea; Morin, Phillip A; Rossiter, Stephen J (21 October 2019). "Phylogenomic Resolution of the Cetacean Tree of Life Using Target Sequence Capture". Systematic Biology. 69 (3): 479–501. doi:10.1093/sysbio/syz068. ISSN 1063-5157. PMC 7164366. PMID 31633766.
  25. ^ Vollmer, Nicole L.; Ashe, Erin; Brownell, Robert L.; Cipriano, Frank; Mead, James G.; Reeves, Randall R.; Soldevilla, Melissa S.; Williams, Rob (2019). "Taxonomic revision of the dolphin genus Lagenorhynchus". Marine Mammal Science. 35 (3): 957–1057. doi:10.1111/mms.12573. ISSN 1748-7692. S2CID 92421374.
  26. ^ NOAA. "Atlantic White-Sided Dolphin". National Oceanic and Atmospheric Administration. U.S. Department of Commerce. Retrieved 25 November 2021.
  27. ^ a b Corcoran, Kieran (13 May 2019). "Eco-campaigners took these grisly photos of whale and dolphin hunts in the Faroe Islands". Insider Inc. Business Insider. Retrieved 25 November 2021.
  28. ^ a b Bloch, Dorete; Mikkelsen, Bjarni (26 February 2017). "Catch history and distribution of white- sided dolphin (Lagenorhynchus acutus) of the Faroe Islands / Veiðisøga og útbreiðsla av skjórutum springara (Lagenorhynchus acutus) í Føroyum". Fróðskaparrit - Faroese Scientific Journal. 57: 190–198. doi:10.18602/fsj.v57i0.82.
  29. ^ "Grindamenn: Drápið gekk ikki so illa".
  30. ^ a b Hammond (2008). "Lagenorhynchus acutus". The IUCN Red List of Threatened Species.
  31. ^ Waring, Gordon. "Incidental Take of Marine Mammals in Foreign Fishery Activities Off the Northeast United States, 1977-88" (PDF). NOAA. Fishery Bulletin. Retrieved 16 March 2020.
  32. ^ Weisbrod (2001). "Species, tissue and gender-related organochlorine bioaccumulation in white-sided dolphins, pilot whales and their common prey in the northwest Atlantic". Marine Environmental Research. 51 (1): 29–50. doi:10.1016/S0141-1136(00)00032-5. PMID 11125702.
  33. ^ Tuerk (2005). "Factors influencing persistent organic pollutant concentrations in the Atlantic white-sided dolphin (Lagenorhynchus acutus)". Environmental Toxicology and Chemistry. 24 (5): 1079–1087. doi:10.1897/04-120R.1. PMID 16110985. S2CID 23781649.
  34. ^ Montie (2009). "Organohalogen contaminants and metabolites in cerebrospinal fluid and cerebellum gray matter in short-beaked common dolphins and Atlantic white-sided dolphins from the western North Atlantic". Environmental Pollution. 157 (8–9): 2345–2358. doi:10.1016/j.envpol.2009.03.024. hdl:1912/2815. PMID 19375836.
  35. ^ Gallien (2001). "Cadmium-containing granules in kidney tissue of the Atlantic white-sided dolphin (Lagenorhyncus acutus) off the Faroe Islands" (PDF). Comparative Biochemistry and Physiology. 130 (3): 389–395. doi:10.1016/s1532-0456(01)00265-4. PMID 11701395. S2CID 20729337.
  36. ^ a b "Appendix II 11 June 2011 at the Wayback Machine" of the Convention on the Conservation of Migratory Species of Wild Animals (CMS). As amended by the Conference of the Parties in 1985, 1988, 1991, 1994, 1997, 1999, 2002, 2005 and 2008. Effective: 5 March 2009.
  37. ^ . Archived from the original on 9 October 2011. Retrieved 31 August 2011.
  38. ^ Tuerk, K. J. S.; Kucklick, J. R.; McFee, W. E.; Pugh, R. S.; Becker, P. R. (2005). "Factors influencing persistent organic pollutant concentrations in the Atlantic white-sided dolphin (Lagenorhynchus acutus)†". Environmental Toxicology and Chemistry. 24 (5): 1079–1087. doi:10.1897/04-120r.1. PMID 16110985. S2CID 23781649.
  39. ^ Official website of the Agreement on the Conservation of Small Cetaceans of the Baltic, North East Atlantic, Irish and North Seas

External links

January 31, 2023
atlantic, white, sided, dolphin, also, pacific, white, sided, dolphin, lagenorhynchus, acutus, distinctively, coloured, dolphin, found, cool, temperate, waters, north, atlantic, ocean, size, compared, average, humanconservation, statusleast, concern, iucn, cit. See also Pacific white sided dolphin The Atlantic white sided dolphin Lagenorhynchus acutus is a distinctively coloured dolphin found in the cool to temperate waters of the North Atlantic Ocean Atlantic white sided dolphinSize compared to an average humanConservation statusLeast Concern IUCN 3 1 1 CITES Appendix II CITES 2 Scientific classificationKingdom AnimaliaPhylum ChordataClass MammaliaOrder ArtiodactylaInfraorder CetaceaFamily DelphinidaeGenus LagenorhynchusGray 1846Species L acutusBinomial nameLagenorhynchus acutus Gray 1828 Atlantic white sided dolphin range Contents 1 Description 2 Geographic range and distribution 3 Behaviour 3 1 Foraging 3 2 Social Behaviour 3 3 Migration 3 4 Reproduction 4 Taxonomy 5 Population status 6 Threats 6 1 Whaling 6 2 Entanglement and by catch 6 3 Noise 6 4 Pollution 7 Conservation status 8 See also 9 References 10 External linksDescription Edit An Atlantic white sided dolphin off the coast of Cape Ann Massachusetts The dolphin is slightly larger than most other oceanic dolphins It is just over a meter in length at birth growing to about 2 8 m 9 2 ft males and 2 5 m 8 2 ft females at maturity 3 It weighs 180 230 kg 400 510 lb once fully grown 3 Females reach sexual maturity at between 6 and 12 years and males between 7 and 11 years 4 5 The gestation period is 11 months and lactation lasts for about 18 months both typical figures for dolphins 3 Individuals are known to live for at least 17 years 3 The key distinguishing feature is the white to pale yellow patch found behind the dorsal fin of the dolphin on each side 3 This colour variation is unique amongst the mixtures of white greys and blues of other pelagic cetaceans 3 The rest of the body s coloration is well demarcated the chin throat and belly are white the flippers dorsal fin and back are dark grey to black with the exception of the yellow patch there is a further white patch below the dorsal fin lying above a light grey stripe that runs from the beak above the eye and down to the tail stock 3 Dolphin group sizes vary by location with groups averaging 60 in number close to the Newfoundland shores but rather smaller east of Iceland 3 From the analysis of the stomach contents of stranded animals fish such as herring and mackerel and squid appear to form the species main diet 3 The Atlantic white sided dolphin is fairly acrobatic and keen to interact with boats however it is not as wildly gregarious as the white beaked and common dolphins 3 Geographic range and distribution EditThe species is endemic to the North Atlantic Ocean 3 The distribution limits are Norwegian sea in the north east Davis Strait in the north west North Carolina in the south west and Celtic Sea in the south east possible range extension to the Azores 3 Areas of particularly high population density include the shores of Newfoundland and Cape Cod the triangular area of sea between the United Kingdom Iceland and Greenland and the North Sea 6 7 8 9 In 2008 sightings of Atlantic white sided dolphins as well as the melon headed whale were documented in South Carolina after a few stranding had taken place in the area at the time 10 The species tends to occur in continental shelf waters around 100m depth 11 They show preference toward areas with steep slopes and canyons 12 13 They are more likely to be observed in cold less saline waters but it is unclear whether it is due to preference or if these factors influence prey distribution 14 15 Behaviour EditForaging Edit The diet of Atlantic white sided dolphins includes mainly herring hake and squid 3 However they consume a large variety of prey including small mackerel and various bottom fish 3 They have been observed to cooperatively hunt on the surface 3 It has been suggested that larger groups split while feeding 12 Social Behaviour Edit Like all species of the dolphin family Atlantic white sided dolphins are very social animals Often traveling in large pods and displaying aerial behaviors as they travel 16 The group size varies from several dozen to several hundreds individuals with average size around 50 17 However there seems to be little relatedness between the members of the group Studies in different parts of the distribution range found that individuals were mainly unrelated to each other 18 19 Juveniles spend at least some time in separate groups than adults 3 Atlantic white sided dolphins jump and breach more frequently when in larger groups thus this behaviour might have a social context 16 They have a wide vocal repertoire which includes squeals whistles clicks and buzzes 17 20 It is suggested that vocalisation is used for communication as noise production increases during socialising 20 Despite being docile creatures even known to interact with various species of cetacean in a nonviolent manner most notably with the long finned pilot whale Globicephala melas 21 they have also been known to display violent behavior towards harbor porpoises attacking them until they eventually succumb to their wounds a similar behavior observed in bottlenose dolphins 22 23 Migration Edit Atlantic white sided dolphins do not undertake specific seasonal migration 12 However they do move within their home range following prey distribution 12 For example in the waters off eastern North America this species moves southwards in winter and spring 3 8 Reproduction Edit Most of the calves are born around June and July 3 The gestation period is 11 months and lactation around 18 months 3 The birth interval varies between 1 3 years 11 Females reach sexual maturity around the age of 6 12 years 4 Males reach sexual maturity around 7 11 years 5 The reproduction is most likely seasonal beginning in February as some studies have identified dormant testes in some males 5 Taxonomy EditThe Atlantic white sided dolphin was named by John Edward Gray in 1828 The specific name acutus comes from the Latin for pointed and refers to the sharply pointed dorsal fin 3 It is traditionally placed in the genus Lagenorhynchus but there is consistent molecular evidence that supports the Atlantic white sided dolphin and the white beaked dolphin as basal members of the family Delphinidae and not closely related 24 It has therefore been proposed to move the Atlantic white sided dolphin to its own genus Leucopleurus 25 Population status EditThe estimations for the U S shelf and shelf edge water suggest that the population size is about 300 000 3 Additional 120 000 individuals have been estimated to spend summer in the Gulf of St Lawrence 3 In the eastern North America waters the numbers increase southwards in winter and spring in association with cold waters from the Gulf of Maine 3 Two projects attempted to estimate the population trends multinational Small Cetacean Abundance in the North Sea and Adjacent Waters SCANS survey project and the North Atlantic Sightings Survey NASS SCANS surveys however failed to produce species specific estimation as it combined both white sided and white beaked dolphins NASS surveys did not indicate any population trends Threats Edit Hvalba Faroe Islands in August 2006 Whaling Edit Historically Atlantic white sided dolphins were killed in drives conducted from Norway and Newfoundland 26 These have ceased in recent years although they still occur to a lesser extent from the Faroe Islands where the meat and blubber are in high regard as food 27 Reported catches in the years vary though individual years suddenly stand out such as in 2002 where the number reported killed was 773 28 and in 2017 when 488 were killed 27 In September 2021 a large pod of 1 428 animals was herded in Skalafjordur and killed 29 Annual number taken of white sided dolphin in the Faroe Islands in the period 1980 2009 28 Year No yr drive yr Year No yr drive yr Year No yr drive yr1980 8 1 1993 377 6 2001 546 71983 10 1 1994 263 7 2002 773 101985 32 1 1995 157 4 2003 186 51986 185 4 1996 357 7 2004 333 51987 76 2 1997 350 10 2005 312 41988 603 4 1998 438 4 2006 622 81990 55 2 1998 438 4 2008 1 11992 47 3 2000 265 3 2009 171 5Entanglement and by catch Edit Atlantic white sided dolphins have also been killed in incidental catch situations in the fishing industry Such occurrences have been reported in Canada United States United Kingdom and Ireland 30 Between 1977 and 1988 13 Atlantic white sided dolphins were reported as being incidentally caught in the Northeastern United States by U S fisheries observers 11 of these in Mackerel fisheries 31 They have also been reported to get caught in pelagic or near surface trawl or drift nets 12 17 Noise Edit Any anthropogenic underwater noise is a potential disturbance to Atlantic white sided dolphins as they use sounds to communicate and catch prey 20 Survey done in the UK showed that the sighting rate of Atlantic white sided dolphins declines when airguns were firing compared to when they were not 20 Pollution Edit Persistent organic pollutants POPs such as PCBs and organochlorine pesticides e g DDT DDE and polybrominated diphenyl ether PBDE flame retardants have been identified in body tissues of Atlantic white sided dolphins throughout their range 7 32 33 34 Males had higher levels of PCBs suggesting that females pass some of the contamination to offspring during lactation 30 Similarly to other species studies have identified heavy metals in Atlantic white sided dolphins including cadmium levels higher than in other dolphin species in southern latitudes 35 The full effect of this contamination is currently unknown Conservation status EditThe International Union of the Conservation of Nature IUCN currently classifies Atlantic white sided dolphins as Least Concern 30 The North and Baltic Sea populations of the Atlantic white sided dolphin are listed on Appendix II 36 of the Convention on the Conservation of Migratory Species of Wild Animals CMS They are listed on Appendix II 36 as they have an unfavourable conservation status or would benefit significantly from international co operation organised by tailored agreements 37 These species of dolphin are known to fall victims to in a polluted environment a study from 1997 confirmed that the British and Irish populations of Atlantic white sided dolphins to succumb to these effects 7 38 In addition the Atlantic white sided dolphin is covered by the Agreement on the Conservation of Small Cetaceans of the Baltic North East Atlantic Irish and North Seas ASCOBANS 39 See also Edit Cetaceans portal Mammals portal Marine life portalList of cetaceans Marine biologyReferences Edit Hammond P S Bearzi G Bjorge A Forney K Karczmarski L Kasuya T Perrin W F Scott M D Wang J Y Wells R S et al 2008 Lagenorhynchus acutus IUCN Red List of Threatened Species 2008 e T11141A3255721 doi 10 2305 IUCN UK 2008 RLTS T11141A3255721 en Database entry includes a brief justification of why this species is of least concern Appendices CITES cites org Retrieved 14 January 2022 a b c d e f g h i j k l m n o p q r s t u v w Reeves Randall 2008 Guide to Marine Mammals of the World New York National Audubon Society pp 398 401 ISBN 978 0375411410 a b Sergeant 1980 Life history and northwest Atlantic status of the Atlantic white sided dolphin Lagenorhynchus acutus Cetology 37 1 12 a b c Neuenhagen 2007 Histology and morphometrics of testes of the white sided dolphin Lagenorhynchus acutus in bycatch samples from the Northeastern Atlantic Mammalian Biology 72 5 283 298 doi 10 1016 j mambio 2006 10 008 Schevill W E 1956 Lagenorhynchus acutus off Cape Cod Journal of Mammalogy 37 1 128 129 doi 10 2307 1375559 JSTOR 1375559 a b c Mckenzie C Rogan E Reid R Wells D 1997 Concentrations and patterns of organic contaminants in Atlantic white sided dolphins Lagenorhynchus acutus from Irish and Scottish coastal waters Environmental Pollution 98 1 15 27 doi 10 1016 s0269 7491 97 00109 7 PMID 15093341 a b Weinrich Mason T Belt Cynthia R Morin David April 2001 Behavior and Ecology of the Atlantic White Sided Dolphin Lagenorhynchus Acutus in Coastal New England Waters Marine Mammal Science 17 2 231 248 doi 10 1111 j 1748 7692 2001 tb01268 x ISSN 0824 0469 Schevill William E February 1956 Lagenorhynchus acutus off Cape Cod Journal of Mammalogy 37 1 128 129 doi 10 2307 1375559 ISSN 0022 2372 JSTOR 1375559 Powell J W Rotstein D S Mcfee W E 2012 First Records of the Melon Headed Whale Peponocephala electra and the Atlantic White Sided Dolphin Lagenorhynchus acutus in South Carolina Southeastern Naturalist 11 1 23 34 doi 10 1656 058 011 0102 S2CID 83544895 a b Waring 2006 U S Atlantic and Gulf of Mexico marine mammal stock assessments 2005 NOAA Technical Memorandum NMFS NE 194 346 a b c d e Gaskin 1992 Status of the Atlantic white sided dolphin Lagenorhynchus acutus in Canada Canadian Field Naturalist 106 64 72 Palka 1997 Summary of knowledge of white sided dolphins Lagenorhynchus acutus from US and Canadian Atlantic waters Report of the International Whaling Commission 47 729 734 Selzer 1988 The distribution of white sided Lagenorhynchus acutus and common dolphins Delphinus delphis vs environmental features of the continental shelf of the northeastern United States Marine Mammal Science 4 2 141 153 doi 10 1111 j 1748 7692 1988 tb00194 x Doksaeter 2008 Distribution and feeding ecology of dolphins along the Mid Atlantic ridge between Iceland and the Azores Deep Sea Research Part II Topical Studies in Oceanography 55 1 2 243 253 Bibcode 2008DSRII 55 243D doi 10 1016 j dsr2 2007 09 009 a b Weinrich M T Belt C R Dorin D 2001 Behavior And Ecology Of The Atlantic White Sided Dolphin Lagenorhynchus acutus In Coastal New England Waters Marine Mammal Science 17 2 231 248 doi 10 1111 j 1748 7692 2001 tb01268 x a b c Reeves 1999 Atlantic white sided dolphin Lagenorhynchus acutus Gray 1828 In S H Ridgway and R Harrison eds Handbook of Marine Mammals 6 31 56 Mirimin 2011 Insights into genetic diversity parentage and group composition of Atlantic white sided dolphins Lagenorhynchus acutus off the West of Ireland based on nuclear and mitochondrial genetic markers Journal of Heredity 102 1 79 87 doi 10 1093 jhered esq106 hdl 10379 12915 PMID 21059883 Fernandez 2016 A genomewide catalogue of single nucleotide polymorphisms in white beaked and Atlantic white sided dolphins Molecular Ecology Resources 16 1 266 276 doi 10 1111 1755 0998 12427 PMID 25950249 S2CID 8129929 a b c d Hamran 2014 Distribution and vocal behavior of Atlantic white sided dolphins Lagenorhynchus acutus in northern Norway University of Nordland Baraff L S Asmutis Silvia R A 1998 Long Term Association of an Individual Long Finned Pilot Whale and Atlantic White Sided Dolphins Marine Mammal Science 14 1 155 161 doi 10 1111 j 1748 7692 1998 tb00700 x Larrat S Measures L Stephane L 2012 Short Note Rake Marks on a Harbor Porpoise Phocoena phocoena Calf Suggestive of a Fatal Interaction with an Atlantic White Sided Dolphin Lagenorhynchus acutus Aquatic Mammals 38 1 86 91 doi 10 1578 am 38 1 2012 86 Ross H M Wilson B 1996 Violent interactions between Bottlenose dolphins and Harbour porpoises Proceedings of the Royal Society B Biological Sciences 263 1368 283 286 Bibcode 1996RSPSB 263 283R doi 10 1098 rspb 1996 0043 S2CID 85372260 McGowen Michael R Tsagkogeorga Georgia Alvarez Carretero Sandra dos Reis Mario Struebig Monika Deaville Robert Jepson Paul D Jarman Simon Polanowski Andrea Morin Phillip A Rossiter Stephen J 21 October 2019 Phylogenomic Resolution of the Cetacean Tree of Life Using Target Sequence Capture Systematic Biology 69 3 479 501 doi 10 1093 sysbio syz068 ISSN 1063 5157 PMC 7164366 PMID 31633766 Vollmer Nicole L Ashe Erin Brownell Robert L Cipriano Frank Mead James G Reeves Randall R Soldevilla Melissa S Williams Rob 2019 Taxonomic revision of the dolphin genus Lagenorhynchus Marine Mammal Science 35 3 957 1057 doi 10 1111 mms 12573 ISSN 1748 7692 S2CID 92421374 NOAA Atlantic White Sided Dolphin National Oceanic and Atmospheric Administration U S Department of Commerce Retrieved 25 November 2021 a b Corcoran Kieran 13 May 2019 Eco campaigners took these grisly photos of whale and dolphin hunts in the Faroe Islands Insider Inc Business Insider Retrieved 25 November 2021 a b Bloch Dorete Mikkelsen Bjarni 26 February 2017 Catch history and distribution of white sided dolphin Lagenorhynchus acutus of the Faroe Islands Veidisoga og utbreidsla av skjorutum springara Lagenorhynchus acutus i Foroyum Frodskaparrit Faroese Scientific Journal 57 190 198 doi 10 18602 fsj v57i0 82 Grindamenn Drapid gekk ikki so illa a b Hammond 2008 Lagenorhynchus acutus The IUCN Red List of Threatened Species Waring Gordon Incidental Take of Marine Mammals in Foreign Fishery Activities Off the Northeast United States 1977 88 PDF NOAA Fishery Bulletin Retrieved 16 March 2020 Weisbrod 2001 Species tissue and gender related organochlorine bioaccumulation in white sided dolphins pilot whales and their common prey in the northwest Atlantic Marine Environmental Research 51 1 29 50 doi 10 1016 S0141 1136 00 00032 5 PMID 11125702 Tuerk 2005 Factors influencing persistent organic pollutant concentrations in the Atlantic white sided dolphin Lagenorhynchus acutus Environmental Toxicology and Chemistry 24 5 1079 1087 doi 10 1897 04 120R 1 PMID 16110985 S2CID 23781649 Montie 2009 Organohalogen contaminants and metabolites in cerebrospinal fluid and cerebellum gray matter in short beaked common dolphins and Atlantic white sided dolphins from the western North Atlantic Environmental Pollution 157 8 9 2345 2358 doi 10 1016 j envpol 2009 03 024 hdl 1912 2815 PMID 19375836 Gallien 2001 Cadmium containing granules in kidney tissue of the Atlantic white sided dolphin Lagenorhyncus acutus off the Faroe Islands PDF Comparative Biochemistry and Physiology 130 3 389 395 doi 10 1016 s1532 0456 01 00265 4 PMID 11701395 S2CID 20729337 a b Appendix II Archived 11 June 2011 at the Wayback Machine of the Convention on the Conservation of Migratory Species of Wild Animals CMS As amended by the Conference of the Parties in 1985 1988 1991 1994 1997 1999 2002 2005 and 2008 Effective 5 March 2009 Convention on Migratory Species page on the Atlantic white sided dolphin Archived from the original on 9 October 2011 Retrieved 31 August 2011 Tuerk K J S Kucklick J R McFee W E Pugh R S Becker P R 2005 Factors influencing persistent organic pollutant concentrations in the Atlantic white sided dolphin Lagenorhynchus acutus Environmental Toxicology and Chemistry 24 5 1079 1087 doi 10 1897 04 120r 1 PMID 16110985 S2CID 23781649 Official website of the Agreement on the Conservation of Small Cetaceans of the Baltic North East Atlantic Irish and North Seas Atlantic white sided Dolphin by Frank Cipriano Encyclopedia of Marine Mammals pp49 51 ISBN 0 12 551340 2 National Audubon Society Guide to Marine Mammals of the World ISBN 0 375 41141 0 Encyclopedia of Marine Mammals ISBN 0 12 551340 2External links EditAtlantic white sided dolphin at ARKive Retrieved from https en wikipedia org w index php title Atlantic white sided dolphin 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