Updated: March 2019
The white-beaked dolphin is a large, robustly built dolphin with black, white, and grey colouration that varies considerably between individuals. It has a sloping melon, and the beak is short, thick, and ranges in colour from white to dark grey and mottled. The dorsal fin is relatively tall and strongly curved. It has a northerly distribution and is found in the cold temperate and subarctic waters of the North Atlantic Ocean, in waters both on and off the continental shelf. The white-beaked dolphin may easily be misidentified as the Atlantic white-sided dolphin (Lagenorhynchus acutus), as their ranges overlap considerably. The white-beaked is typically larger than the white-sided and lacks the yellow streaks on its side that the white-sided has. The white-beaked is also commonly found in waters further north than other dolphins.
Quite abundant in the temperate and subarctic shelf habitats of the North Atlantic Ocean, with a total population upwards of 100,000. In many regions it is the most common dolphin present.
Has a northerly distribution, and is found in the cold temperate and subarctic waters of the North Atlantic Ocean.
Has never been subject to any commercial harvest. Small scale hunting of this species for food has occurred in Norway, Greenland, Iceland, the Faroe Islands and Canada.
As a widespread and abundant species, with no reported population declines or major threats identified, it receives little management attention.
Scientific name: Lagenorhynchus albirostris
Faroese: Kjafthvitur springari
Greenlandic: Aarluarsuk, ardluarsuk
Icelandic: Hnýðingur , blettahnýðir
Norwegian: Hvitnos, kvitnos, springer
English: White-beaked dolphin, Springer, Jumper, Squidhound
Russian: Belomordyi del’fin
Can live to be more than 30 years old.
Adults are on average 240-280 cm long and weigh 200-300 kg, with males generally being longer and heavier than females.
MIGRATION AND MOVEMENTS
There appear to be some seasonal movements, with dolphins moving north in the summer months and south during the winter. In some cases their movements seem to follow schooling capelin or other fish. Water temperature is also an important determinant of habitat use for this species.
Primarily piscivorous, consuming a variety of fish species, but occasionally feeds on squid, octopus and benthic crustaceans. Cooperative feeding has been observed.
The white-beaked dolphin (Lagenorhynchus albirostris) is a large, robustly built dolphin with black, white, and grey colouration. It has a short, thick rostrum or “beak” about 5 to 8 cm long in front of a sloping melon. Despite their name, the beak is not always white. In one photographic study of the species, only 7% of adults had completely white beaks (Bertulli et al. 2016a). More often, the beak is a mottled or a dark grey colour, especially in older individuals, although the tip may be white. The body is black or dark grey except behind the dorsal fin, where a pale grey to whitish area extends up from the flanks, forming a distinctive pale “saddle” or patch. This patch is often less distinct in young animals.
The underside is light grey to white in colour, while the flippers, fluke and dorsal fin are all dark grey to black, although there may be light patches on the anterior leading edges of the fin and flippers in adults. The dorsal fin is located at the mid-point of the body, and is relatively tall and strongly curved. In front of the dorsal fin in some animals is a grey chevron which can extend into an irregular strip along the animal’s sides and into the dorsal patch. Around the eye is a pale ring, which may be connected to the beak by a thin, white line. Overall, there is considerable variation in colouration between individuals of this species (Lien et al. 2001, Bertulli et al. 2016a).
Colouration also varies by age, and in one study, four different age-classes of dolphin: adults, juveniles, calves, and neonates could be distinguished based on colour pattern (Bertulli et al. 2016a). Juveniles and calves, for example, were identified by the presence of any of three colour patterns: speckling, a semicircular head blaze, and a lateral patch. In this species, speckling decreased with age and was lost completely when the dolphin became sexually mature, the opposite of most other dolphin species, in which speckles appear as the animal matures (Bertulli et al. 2016a).
The white-beaked dolphin may easily be misidentified as the Atlantic white-sided dolphin (L . acutus ), as their ranges overlap considerably. The white-beaked is typically larger than the white-sided, and lacks the yellow streaks on its side that the white-sided has. The number of teeth is also different, with the white-beaked having fewer teeth than the white-sided. The white-beaked is also commonly found in waters further north than other dolphins.
Life History and Ecology
White-beaked dolphins are fast, powerful swimmers and are quite active at the water’s surface. Their local names of “jumper” or “springer” come from their common practice of breaching, leaping vertically clear out of the water. They seem to be attracted to small boats, and will often ride the bow or stern wave (Reeves et al. 1999, Lien et al. 2001). Photo-identification and other observations of these dolphins around Iceland found that white-beaked dolphins spend much of their time travelling, with one tagged dolphin covering over 5000 km in 201 days (Rasmussen et al. 2013).
The diving behaviour is not well known for this species. Only one individual has so far been tagged with a bio-logging device. A juvenile male in Faxaflói Bay in western Iceland was found to make fairly shallow dives, to a mean depth of 24 m, with a deepest dive of 45 m. The maximum dive time observed was 78 seconds, but the dives were generally shorter with a mean duration of 28 seconds (Rasmussen et al. 2013).
White-beaked dolphins generally travel in small pods of less than 10 individuals. During the 2016 SCANS III survey of the North Sea, the mean group size seen was 3.86 (Hammond et al. 2017). It is not unusual , however, to see larger groups or herds of several hundred, or even thousands, of animals (Dong et al. 1996, Reeves et al. 1999, Lien et al. 2001). Groups in some cases appear to be segregated by age and sex (Evans and Smeenk 2008), with groups of juveniles separated from groups of adults with calves.
Cooperative feeding has been observed in white-beaked dolphins, with the dolphins herding or encircling schools of fish, trapping them at the water’s surface (Reeves et al. 1999, Evans and Smeenk 2008). They also seem to associate with certain species of whales, especially fin, sei, and humpback whales, perhaps obtaining food from their mouths as the whales surface (Reeves et al. 1999). While feeding, they may also form mixed schools with other types of dolphins such as Atlantic white-sided and bottlenose dolphins.
White-beaked dolphins produce a variety of sounds, described as whistles, squeaks, buzzes and clicks. Whistles may be used to identify individuals, and are likely used for group members to keep in contact with each other, or for mothers and calves to keep contact. Whistles have been found to be directional, and able to be used at distances of up to around 10.5 km (Rasmussen et al. 2006).
Pulsed sounds such as the clicks, are used primarily for echolocation (Reeves et al. 1999), although the white-beaked dolphin has been observed to use ” burst pulse” vocalizations for communication (Simard et al. 2008).
Mass strandings for this species are rare, and seem to be less common than for white-sided dolphins (Lien et al. 2001,Waring et al. 2006). They are regularly found stranded, however, but as individuals or in small groups of 2 to 7 animals. They are one of the most frequently stranded cetaceans along the North Sea coast of the UK (Reeves et al. 1999), although the number of reported strandings has steadily declined since the 1970s (Canning et al. 2008).
White-beaked dolphins also occasionally become trapped in moving pack ice and may die due to drowning or being crushed by the ice. Around Newfoundland, 29 entrapment events were recorded between 1979 and 1991, with up to 350 dolphins killed (Dong et al. 1996).
At birth, white-beaked dolphins are about 110 to 120 cm long and 40 kg in weight (Lien et al. 2001, Evans and Smeek 2008). They grow quickly up to age 3, with males growing faster than females (Dong et al. 1996). Adult males are larger than females, averaging 250 to 280 cm and 250 to 300 kg, with the longest male recorded at 310 cm. The heaviest reported male was 354 kg. Adult females generally range in length from 240 to 270 cm and weigh 200 to 250 kg. The heaviest female seen was 306 kg, although a pregnant female was found which weighed 387 kg (Reeves et al. 1999, Evans and Smeek 2008).
The biology of this species is not well known, but both mating and partuition are thought to occur during the summer months (Galatius and Kinze 2016). In one study, testes weights of stranded males found between mid-April and late August were more than double the “baseline” weights for mature males, suggesting that breeding occurs at this time (Galatius et al. 2013).
Strandings of newborns and very young calves are reported almost exclusively between June and September, which seems to indicate that births occur during that time (Lien et al. 2001, Canning et al. 2008). One young is born at a time, after a gestation period of about 11 months (Reeves et al. 1999). It is not known if a female produces a calf each year, or if there is a resting period between calves.
White-beaked dolphin females become sexually mature somewhere between 6 and 10 years old, at a length of 230 to 250 cm (Evans and Smeek 2008, Galatius and Kinze 2016). Males become sexually mature about 2 years later than females, between 8 and 12 years old, and generally between 230 and 260 cm in length. There appears to be considerable variation in age and size at sexual maturity for both males and females (Dong et al. 1996), with one study finding an immature male that was 16 years old (Galatius et al. 2013). White-beaked dolphins can live to be over 30 years.
Food and feeding
White-beaked dophins are primarily piscivorous, consuming a variety of fish species. In one study, 25 different species of fish were found in dolphin stomach contents (Jansen et al. 2010). Some of the main types of fish that these dolphins eat are species of Clupea, Mallotus, Gadus, Merlangius, Melanogrammus, Trisopterus, Eleginus, Merluccius, Trachurus, Scomber, as well as various species of Ammodytidae, Gobiidae, Soleidae, Pleuronectidae and Bothidae (Evans and Smeenk 2008). While they will eat a variety of fish, some of the larger species dominate the diet, particularly Gadidae. In a study of 45 white-beaked dolphins stranded on the Dutch coast between 1968 and 2005, Gadidae, particularly whiting (Merlangius) and cod (Gadus) were found in every stomach, and were the dominant component of the diet by both weight (98.0%) and numbers (40.0%) (Jansen et al. 2010). Other studies of the diet of white-beaked dolphins from both the North Sea and Newfoundland found cod Gadus morhua, whiting Merlangius merlangus and hake Merluccius merluccius to be the dominant prey items (Reeves et al. 1999, Evans and Smeenk 2008). Off Newfoundland, 90% of the dolphin stomachs examined contained otoliths or bones from cod (Gadus morhua) (Dong et al. 1996). Dolphins stranded on the Scottish east coast had stomachs which contained predominantly haddock (Melanogrammus) and whiting (Canning et al. 2008).
In West Greenland, fish species such as capelin (Mallotus villosus), sandeel (Ammodytes sp) and haddock are important components in the diet of these dolphins (Hansen and Heide-Jørgensen 2013), and they have been observed feeding on capelin off south-eastern Greenland (Reeves et al. 1999). Dolphins in Iceland had a similar diet, with larger fish such as haddock (Melanogrammus aeglefinus), cod (Gadus morhua), and saithe (Pollachius virens) as the most important constituents (Víkingsson and Olafsdóttir 2004 in Galatius and Kinze 2016).
In addition to fish, white-beaked dolphins occasionally feed on squid, octopus and benthic crustaceans (Reeves et al. 1999, Lien et al. 2001, Evans and Smeenk 2008). Remains of seaweed were also found in a few dolphin stomachs from Newfoundland (Dong et al. 1996).
In the only long-term study of white-beaked dolphin diet, in which stranded animals were examined over a 35 year period, no overall change in the diet was observed, or any clear differences in the diet of different sexes or size-classes of dolphins (Jansen et al. 2010).
White-beaked dolphins have few natural predators. The killer whale (Orcinus orca) appears to be their main predator, with rake marks, probably from these whales, found on the back and flanks of some dolphins in Icelandic waters (Bertulli et al. 2012). Some wounds found on white-beaked dolphins also appeared to be caused by conspecifics (Bertulli et al. 2016b).
In Svalbard, a polar bear was observed feeding on two white-beaked dolphins (Aars et al. 2015). The dolphins were part of a small pod that had become trapped in ice, and were probably killed by the bear as they were forced to surface for air.
Health – diseases and parasites
White-beaked dolphins may become infected with various bacteria, viruses and parasites. A thorough description may be found in Galatius and Kinze (2016). Infections in the jaws and teeth of stranded dolphins are often noted (Lien et al. 2001), which are thought to be due to old age. Infections may also be present on the skin. Among the 76 white-beaked dolphins observed in Faxaflói Bay, western Iceland, 56 (or 73.7%) had at least one skin condition (Bertuilli et al.2012), with “tattoo-like” lesions and traumas most often seen.
These dolphins also seem to be susceptible to spinal deformities, with fused vertebrae and other conspicuous vertebral malformations found in stranded individuals (Galatius et al. 2009, Bertulli et al. 2015b).
Like many other marine mammals, white-beaked dolphins contain parasites such as tapeworms and various nematodes (Lien et al. 2001, Galatius and Kinze 2016).
Distribution and habitat
The white-beaked dolphin has a northerly distribution, and is found in the cold temperate and subarctic waters of the North Atlantic Ocean. In the northwest Atlantic, they are found around southern Greenland and into Davis Strait. They very rarely occur on the western side of Davis Strait, with only 2 individuals sighted off southern Baffin Island between 2004 and 2013 (Reinhart et al. 2014). The species is common along the coast of Labrador in the summer and fall, and ranges as far south as Cape Cod Massachusetts in the winter and spring (Dong et al. 1996, Evans and Smeek 2008). In the northeastern Atlantic, white-beaked dolphins are common around Iceland, east to Svalbard and Novaya Zemlya in the Barents Sea. They are also found along portions of the Atlantic coast of Norway and south to around Denmark. They occur in the Kattegat, between Denmark and Sweden, but rarely go into the Baltic Sea. White-beaked dolphins are found all around the British Isles, and along parts of the Atlantic coast of Ireland. They have been reported as far south as 47◦N along the French coast, as well as rare sightings off Spain and Portugal (Reeves et al. 1999).
The white-beaked dolphin is pelagic, and can be found in waters both on and off of the continental shelf, although there is evidence suggesting that they prefer waters less than 200 m deep (Evans and Smeenk 2008, Hammond et al. 2012). In the Barents Sea, dolphin density peaked at depths of 150 to 200 m, but also at depths of around 400 m (Fall and Skern-Mauritzen 2014). Off the coasts of Newfoundland and Labrador, sightings of these dolphins are more common in nearshore waters than offshore, but that may just be due to the greater amount of human activity near shore resulting in more sightings (Lien et al. 2001). In other areas, however, they are found in deeper waters. Off the West Greenland shelf, large groups of this species were associated with depths from 300 to 1,000 m, and smaller groups were found over even deeper waters (Hansen and Heide-Jørgensen 2013). The species is highly mobile and transient, and can range over large areas of ocean (Bertulli et al. 2015a).
Migrations and movements
A change in habitat use has been documented in U.S. waters, where white-beaked dolphins were observed mainly on the continental shelf prior to the 1970s, but were primarily found over slope waters during the 1970s. This shift appeared to be associated with changes in the abundance of some of their fish prey species, as well as a change in the distribution of Atlantic white-sided dolphins, L. acutus (Waring et al. 2006).
There appear to be some seasonal movements, with dolphins moving north in the summer months and south during the winter. This is seen both along the coasts of Labrador (Lien et al. 2001) and west Greenland (Hansen and Heide-Jørgensen 2013). In some cases, their movements seem to follow schooling capelin or other fish (Lien et al. 2001). While travelling, they are generally found in small groups, but can congregate in larger numbers in good feeding areas (Hansen and Heide-Jørgensen 2013).
There is some evidence that female white-beaked dolphins may move into nearshore waters to give birth. This is suggested by a peak in calf strandings in UK waters during the summer months, which coincides with a peak in female strandings (Canning et al. 2008).
Water temperature is also an important determinant of habitat use for this species. White-beaked dolphins appear to prefer cooler waters, with their occurrence decreasing significantly in water temperatures greater than around 12 to 14◦C (Tetley and Dolman 2013). Water temperature has also been suggested as a factor in white-beaked dolphin movements around the UK, with dolphin distribution shifting northwards perhaps due to increasing water temperatures in the south (Canning et al. 2008).
North Atlantic stocks
The white-beaked dolphin has a wide range across the north Atlantic Ocean. While no clear stocks have been identified, there appears to be four areas with higher densities of dolphins: off the Labrador Shelf in the northwest Atlantic and around southwestern Greenland; around Iceland; around the northern part of the British Isles and the North Sea; and the shelf along the Norwegian coast and into the Barents Sea (Kinze 2009).
There has been some limited information obtained on the population structure of this dolphin, which suggests that there may be separate stocks. Mikkelsen and Lund (1994) found differences in skull morphometrics between white-beaked dolphins from the eastern (US coast) and western north Atlantic (North Sea and English Channel). This difference was confirmed by a genetic study looking at mitochondrial and microsatellite DNA variation (Banguera-Hinestroza et al. 2010). The same study also found a difference between dolphins from around the UK and in the North Sea with those from the Norwegian coast and Barents Sea. A more recent genetic study did find some population substructure among white-beaked dolphins in the northeast Atlantic, but it was not linked to geographical region, as individuals from “clusters” identified were found throughout the research areas (Fernández et al. 2016).
Based on these studies and other data, four distinct management units for white-beaked dolphins have been proposed: 1) Western North Atlantic (Canadian and northern US waters); 2) Icelandic waters; 3) northern Norway; and 4) around the British Isles and all of the North Sea (Evans and Teilmann 2009). Further genetics studies with samples from all regions are needed in order to completely determine the population and stock structure for this species.
Current abundance and trends
There are some population estimates available for white-beaked dolphins in different parts of their range. Generally, however, the population has not been extensively surveyed, with some of the estimates arising from surveys where other species were the primary target.
In the northwest Atlantic, aerial surveys off eastern Newfoundland and the Labrador coast in the 1980s gave an estimate of 5,500 white-beaked dolphins (Alling and Whitehead 1987). A ship survey off the Labrador shelf in 1982 gave an estimate of 3,486 individuals (95% CI 2,001 – 4,971)(Alling and Whitehead 1987). In the Gulf of St. Lawrence, around 2,500 white-beaked dolphins were found in 1995 and 1996, in the Strait of Belle Isle and the extreme north-eastern Gulf (Kingsley and Reeves 1998). More recently, a 2006 survey covering an area from the Georges Bank to the mouth of the Bay of Fundy and north to the entrance of the Gulf of St. Lawrence estimated 2,003 animals (CV=0.94) (Waring et al. 2008). In 2007, an aerial survey of the Canadian shelf from north Labrador to the United States border gave a preliminary estimate of 1,842 dolphins (CV= 0.22)(Lawson and Gosselin 2009).
A survey was also done in 2007 of the shelf of West Greenland as far north as 71° and up to 90 km off the coast, which gave a population estimate for white-beaked dolphins in that area of 11,984 (CV = 0.19)(Hansen and Heide-Jørgensen 2013 ). Both East and West Greenland were surveyed in 2015, with population estimates made of 2,747 white-beaked dolphins (95% CI: 1,257-6,002) in West Greenland and 2,140 (95% CI: 825-5,547) in East Greenland (NAMMCO 2016).
White-beaked dolphins are considered common in the waters around Iceland. From the North Atlantic Sightings Surveys (NASS) conducted in 2001, a population estimate of 31,653 (95% CI 17,679–56,672) was calculated (Pike et al. 2009). This estimate did include other dolphin species, although the overwhelming majority of the sightings were white-beaked dolphins. A more recent aerial survey around Iceland produced an estimate for white-beaked dolphins of 59,966 (CV = 0.44; 95% CI 24,907 – 144,377)(Pike et al. 2017 in prep), with these dolphins being the most numerous species sighted overall.
In the North Sea, several surveys have been carried out. From ship surveys for minke whales carried out in the southern North Sea, southern Barents Sea and west to Svalbard in 1988, a population estimate of 132,000 small delphinids was calculated (CV 0.266, 95% CI 79,000 to 220,000). A similar survey in 1995 gave an estimate of 91,000 (CV = 0.59)(Øien 1996). The great majority, likely 90%, of these were white-beaked dolphins, based on previous surveys where animals were identified to species (Reeves et al. 1999). Around Iceland, 92% of the dolphins observed during the NASS surveys were white-beaked (Pike et al. 2009).
The multinational Small Cetacean Abundance in the North Sea and Adjacent waters (SCANS) survey was carried out in 1994, 2005 and again in 2016. The 1994 survey estimated 7,856 white-beaked dolphins in this area, although in the most recent report this figure has been revised to 23,716. The 2005 estimate was 16,536, and this estimate has also been revised to 37, 689 (Hammond et al. 2017). The 2016 estimate for white-beaked dolphins in this regions is 36,287 (CV = 0.29; 95% CI 18,694 to 61,869)(Hammond et al. 2017).
Another population estimate was calculated for white-beaked dolphins in the northeastern Atlantic using estimates of nucleotide diversity found in a recent genetics study. Fernández et al. (2016) calculated an effective population size of 61,253 to 88,963 individuals.
Overall, the white-beaked dolphin is quite abundant in the temperate and subarctic shelf habitats of the North Atlantic Ocean, with a total population upwards of 100,000. In many regions it is the most common dolphin present.
One of the few projects able to give an indication of possible population trends is the multinational Small Cetacean Abundance in the North Sea and Adjacent waters, or SCANS, survey project. First begun in 1994, the survey was repeated in 2005 and again in 2016. Results of the trend analysis of population estimates for white-beaked dolphin in the North Sea show no indication of changes in abundance since 1994 (Hammond et al. 2017).
In Icelandic waters, numbers of white-beaked dolphins showed little change and no trend between 1986 and 2001, as the uncorrected abundances for those years ranged from 11,717 (95% CI 7,684; 17,864) in 1995 to 18,706 (95% CI 11,936; 29,317) in 2001 (Pike et al. 2009). The most recent uncorrected NASS estimate, for 2016, is over twice that found in those surveys and is significantly larger than the 1995 estimate, though not significantly larger than the 2001 estimate (Pike et al. 2017). It is difficult, however, to say if this indicates an upwards population trend, as the surveys are unlikely to be covering an entire stock unit (if there is a separate Icelandic stock). The increase in numbers seen could be a result of changes in dolphin distribution over an area larger than that covered by the survey.
Around the UK, there seems to be a decline in white-beaked dolphin numbers, with numbers of strandings declining since the 1970s in all areas except in the north-east of Scotland (Canning et al. 2008). It is difficult to say whether this is a result of actual population decline, or a result of a shift in habitat use.
In West Greenland, a decline in abundance was noted between the 2007 and 2015 surveys, with the number of sightings in West Greenland in 2015 being only half of the sightings in 2007 (NAMMCO 2016). Further surveys would be needed in order to determine if this is a population trend or not. No previous estimate is available from East Greenland for comparison.
Systematic surveys have not been carried out in other parts of the white-beaked dolphin’s range, making it impossible to make any conclusions about population trends in those regions.
The white-beaked dolphin is a widespread and abundant species, with no reported population declines or major threats identified. As such, it receives little management attention.
Hunting is allowed in Greenland year-round for this species. While there are no quotas or catch limits, harvest numbers are reported and monitored annually (e.g. Piniarneq 2014).
Since 2008, it has been listed in the International Union for the Conservation of Nature (IUCN) red list in the category of “Least Concern” (Hammond et al. 2012).
While not considered endangered, White-beaked dolphins are listed in Appendix II of CITES, the Convention on International Trade in Endangered Species of Wild Flora and Fauna, as well as in Appendix II of the Convention on the Conservation of Migratory Species of Wild Animals (CMS). These conventions provide for international cooperation in the management of widely distributed species.
Hunting and utilisation
The white-beaked dolphin has never been subject to any commercial harvest. Small scale hunting of this species for food has occurred in Norway, Greenland, Iceland, the Faroe Islands and Canada (Lien et al. 2001, Hammond et al. 2012).
In Canada, white-beaked dolphins are opportunistically hunted by communities in Newfoundland and Labrador. From interviews conducted in the 1980s, an estimated 366 dolphins were taken each year in this area, although the numbers from year to year were highly variable (Alling and Whitehead 1987).
Hunting also occurs in Greenland. Harvest numbers are reported each year, although for combined catches of white-beaked and Atlantic white-sided dolphins. Between 2006 and 2011, a total of 802 dolphins were taken (Piniarneq 2014). Hunting here is also opportunistic, with numbers taken each year varying from 39 in 2007 to 261 in 2010. More recently, the average catch of dolphins between 2011-2015 was 160 per year, an increase over the previous 5 years (2006-2010) where the average was 115 per year (NAMMCO 2016). It is not known whether this is due to an increase in the dolphin population off Greenland, or if hunters are targeting dolphins more.
In the Faroe Islands, white-beaked and Atlantic white-sided dolphins are occasionally taken in the drive catches traditionally done for pilot whales. Over close to 300 years (1709–1995), the reported combined numbers of L. albirostris and L. acutus harvested in the Faroes was 5,148 individuals, most of which were L. acutus (Bloch 1996 in Galatius and Kinze 2016). Catches of dolphins in the Faroe Islands decreased greatly after 2007, and there have been few drive hunts in recent years (NAMMCO 2015). Most, if not all, of the Faroese catches listed in the table below is of Atlantic white-sided dolphins.
Reported catches of white-sided and white-beaked dolphins
|Faroe Islands||2018||Faroe Islands||256|
|Faroe Islands||2017||Faroe Islands||488|
|Faroe Islands||2016||Faroe Islands||0|
|Faroe Islands||2015||Faroe Islands||0|
|Faroe Islands||2014||Faroe Islands||0|
|Faroe Islands||2013||Faroe Islands||430|
|Faroe Islands||2012||Faroe Islands||0|
|Faroe Islands||2011||Faroe Islands||0|
|Faroe Islands||2010||Faroe Islands||14|
|Faroe Islands||2009||Faroe Islands||170|
|Faroe Islands||2008||Faroe Islands||1|
|Faroe Islands||2007||Faroe Islands||0|
|Faroe Islands||2006||Faroe Islands||622|
|Faroe Islands||2005||Faroe Islands||312|
|Faroe Islands||2004||Faroe Islands||333|
|Faroe Islands||2003||Faroe Islands||186|
|Faroe Islands||2002||Faroe Islands||773|
|Faroe Islands||2001||Faroe Islands||546|
|Faroe Islands||2000||Faroe Islands||255|
|Faroe Islands||1999||Faroe Islands||0|
|Faroe Islands||1998||Faroe Islands||438|
|Faroe Islands||1997||Faroe Islands||350|
|Faroe Islands||1996||Faroe Islands||152|
|Faroe Islands||1995||Faroe Islands||151|
|Faroe Islands||1994||Faroe Islands||258|
|Faroe Islands||1993||Faroe Islands||377|
|Faroe Islands||1992||Faroe Islands||47|
|Greenland||1992-2002||Total||*No reported catches|
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Other human impacts
White-beaked dolphins may become caught in the gill nets or trawls used in commercial fisheries. Scars or wounds suspected to have resulted from entanglement in fishing gear were seen in 15 of 90 photo-identified L. albirostris off Iceland (Bertulli et al. 2012). In some cases, entanglement leads to death of the dolphins by drowning. Such by-catch was reported to be “common” in Newfoundland and Labrador (Dong et al. 1996), but was thought to be under-reported as the dolphins did little damage to the gear. Because the extent of by-catch on this species is unknown, it is difficult to state whether or not it has any impact on the population.
Struck and loss
During the small scale hunting of these dolphins, some animals which are hit may not be retrieved. This is referred to as “struck and loss”. Fishermen interviewed along the Newfoundland and Labrador coasts reported a struck and loss rate of from 25 to 50% (Alling and Whitehead 1987). Estimates from hunting in other areas have not been reported.
Because white-beaked dolphins use sound to communicate, any noise from human activities may interfere with their behaviour. This has been seen, for example, in their response to noise from airguns used in seismic surveys (Stone and Tasker 2006). Other potential sources of disturbance could be activities such as shipping, oil and gas exploration, or any other human activity occurring in their habitat.
Both heavy metals and organochlorines have been found in white-beaked dolphin tissue samples from across the species’ range. In samples from Newfoundland, concentrations of both heavy metals and organochlorines were substantially higher in white-beaked dolphins than in other cetaceans (Muir et al. 1988). The main types of organochlorines detected were DDTs, PCBs, toxaphenes and chlordanes.
Similar contaminants were found in white-beaked dolphins from the North Sea – PCBs and heptachlor epoxide (Lien et al. 2001).
The possible effects of these pollutants are not known for this species, or what “safe” levels of these compounds might be.
White-beaked dolphin distribution appears to depend heavily on water temperature. This species seems to prefer cooler waters, with their occurrence decreasing significantly in water temperatures greater than around 12 to 14◦C (Tetley and Dolman 2013). Water temperature has also been suggested as a factor in white-beaked dolphin movements around the UK, with dolphin distribution shifting northwards (Canning et al. 2008) and declining on the west coast of Scotland (MacLeod et al. 2005), due to rising water temperatures
If water temperatures increase due to global climate change, this could have an impact on the distribution and habitat available for these dolphins, particularly in northwestern Europe, where the area of suitable shelf waters may be dramatically reduced (MacLeod et al. 2005). In some areas, the white-beaked dolphin could become displaced by other species, such as the common dolphin, which prefer warmer waters (MacLeod et al. 2008). Other possible consequences of changing water temperatures include redistribution of the dolphin’s prey species, and the introduction of new diseases or parasites. Sea lampreys, for example, have recently been observed on white-beaked dolphins in Icelandic waters for the first time (Bertulli et al. 2016b).
Research in NAMMCO member countries
NAMMCO member countries work cooperatively on projects such as the North Atlantic Sightings Survey (NASS) to obtain population estimates for white-beaked dolphins in member country’s waters. Norway has also participated in the multinational Small Cetacean Abundance in the North Sea and Adjacent waters, or SCANS, surveys.
Much research has been done in Iceland on white-beaked dolphins; on their life history, ecology and behaviour. The Húsavik Research Centre (HRC) runs long-term photo-identification and sightings studies of white-beaked dolphins in Skjálfandi Bay. In 2018, Continuous porpoise detectors (C-PODS) were deployed in the bay for detection of white-beaked dolphins, and efforts to estimate by-catch rates in fisheries are ongoing (National Progress Report Iceland 2018).
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International Union for the Conservation of Nature: http://www.iucnredlist.org/details/11142/0
Greenland Institute of Natural Resources: http://www.natur.gl/en/birds-and-mammals/marine-mammals/white-beaked-dolphin/
Norwegian Polar Institute: http://www.npolar.no/en/species/white-beaked-dolphin.html
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