“Blue whale”的意思、由来-开放百科全书

The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whale parvorder, Mysticeti.^[5] At up to {{convert|29.9|m|ft}}^[6] in length and with a maximum recorded weight of {{convert|173|tonne|short ton|lk=on|abbr=off|-1}},^[6] it is the largest animal known to have ever existed.^[5]^[9]

Long and slender, the blue whale's body can be various shades of bluish-grey dorsally and somewhat lighter underneath.^[6] There are at least three distinct subspecies: B. m. musculus of the North Atlantic and North Pacific, B. m. intermedia of the Southern Ocean and B. m. brevicauda (also known as the pygmy blue whale) found in the Indian Ocean and South Pacific Ocean. B. m. indica, found in the Indian Ocean, may be another subspecies. As with other baleen whales, its diet consists almost exclusively of small crustaceans known as krill.^[7]

Blue whales were abundant in nearly all the oceans on Earth until the beginning of the twentieth century. For over a century, they were hunted almost to extinction by whalers until protected by the international community in 1966. A 2002 report estimated there were 5,000 to 12,000 blue whales worldwide,^[8] in at least five groups. The IUCN estimates that there are probably between 10,000 and 25,000 blue whales worldwide today.^[4] Before whaling, the largest population was in the Antarctic, numbering approximately 239,000 (range 202,000 to 311,000).^[9] There remain only much smaller (around 2,000) concentrations in each of the eastern North Pacific, Antarctic, and Indian Ocean groups. There are two more groups in the North Atlantic, and at least two in the Southern Hemisphere. The Eastern North Pacific blue whale population had rebounded by 2014 to nearly its pre-hunting population.^[10]

Taxonomy

Blue whales are rorquals (family Balaenopteridae), a family that includes the humpback whale, the fin whale, Bryde's whale, the sei whale, and the minke whale.^[5] The family Balaenopteridae is believed to have diverged from the other families of the suborder Mysticeti as long ago as the middle Oligocene (28 Ma ago). The blue whale lineage diverged from the other rorquals during the Miocene, between 7.5 and 10.5 million years ago. However, gene flow between the species appears to have continued beyond that date. The blue whale has the greatest genetic diversity of any baleen whale, and a higher than average diversity among mammals.^[11]

The blue whale is usually classified as one of eight species in the genus Balaenoptera; one authority places it in a separate monotypic genus, Sibbaldus,^[12] but this is not accepted elsewhere.^[3] DNA sequencing analysis indicates that the blue whale is phylogenetically closer to the sei whale (Balaenoptera borealis) and Bryde's whale (Balaenoptera brydei) than to other Balaenoptera species, and closer to the humpback whale (Megaptera) and the gray whale (Eschrichtius) than to the minke whales (Balaenoptera acutorostrata and Balaenoptera bonaerensis).^[13]^[14]

There have been at least 11 documented cases of blue whale-fin whale hybrid adults in the wild. Arnason and Gullberg describe the genetic distance between a blue and a fin as about the same as that between a human and a gorilla.^[15] Researchers working off Fiji believe they photographed a hybrid humpback-blue whale^[16] including the discovery through DNA analysis from a meat sample found in a Japanese market.^[17]^[18]

The first published description of the blue whale comes from Robert Sibbald's Phalainologia Nova (1694). In September 1692, Sibbald found a blue whale that had stranded in the Firth of Forth – a male {{convert|78|ft|m|abbr=on|order=flip}} long – that had "black, horny plates" and "two large apertures approaching a pyramid in shape".^[9]

The specific name musculus is Latin and could mean "muscle", but it can also be interpreted as "little mouse".^[19] Carl Linnaeus, who named the species in his seminal Systema Naturae of 1758,^[20] would have known this and may have intended the ironic double meaning.^[21] Herman Melville called this species "sulphur-bottom" in his novel Moby-Dick (1851) due to an orange-brown or yellow tinge on the underparts from diatom films on the skin. Other common names for the blue whale have included "Sibbald's rorqual" (after Sibbald, who first described the species), the "great blue whale" and the "great northern rorqual". These names have now fallen into disuse. The first known usage of the term "blue whale" was in Melville's Moby-Dick, which only mentions it in passing and does not specifically attribute it to the species in question. The name was really derived from the Norwegian blåhval, coined by Svend Foyn shortly after he had perfected the harpoon gun; the Norwegian scientist G. O. Sars adopted it as the Norwegian common name in 1874.^[22]

Authorities classify the species into three or four subspecies: B. m. musculus, the northern blue whale consisting of the North Atlantic and North Pacific populations, B. m. intermedia, the southern blue whale of the Southern Ocean, B. m. brevicauda, the pygmy blue whale found in the Indian Ocean and South Pacific,^[23] and the more problematic B. m. indica, the great Indian rorqual, which is also found in the Indian Ocean and, although described earlier, may be the same subspecies as B. m. brevicauda.^[3]

The pygmy blue whale formed from a founder group of Antarctic blue whales about 20,000 years ago, around the Last Glacial Maximum. This is likely because blue whales were driven north by expanding ice, and some have stayed there ever since. The pygmy blue whale's evolutionarily recent origins cause it to have a relatively low genetic diversity.^[24]

Description

The blue whale has a long tapering body that appears stretched in comparison with the stockier build of other whales.^[25] The head is flat, U-shaped and has a prominent ridge running from the blowhole to the top of the upper lip.^[25] The front part of the mouth is thick with baleen plates; around 300 plates, each around {{convert|1|m|ft|abbr=off|spell=in}} long,^[25] hang from the upper jaw, running {{convert|0.5|m|in|sigfig=1|abbr=on}} back into the mouth. Between 70 and 118 grooves (called ventral pleats) run along the throat parallel to the body length. These pleats assist with evacuating water from the mouth after lunge feeding (see feeding below).

The dorsal fin is small;^[25] its height averages about {{convert|28|cm}}, and usually ranges between {{convert|20|and|40|cm|in|abbr=on}}, though it can be as small as {{convert|8|cm|in|abbr=on}} or as large as {{convert|70|cm|in|abbr=on}}.^[26] It is visible only briefly during the dive sequence. Located around three-quarters of the way along the length of the body, it varies in shape from one individual to another; some only have a barely perceptible lump, but others may have prominent and falcate (sickle-shaped) dorsals. When surfacing to breathe, the blue whale raises its shoulder and blowhole out of the water to a greater extent than other large whales, such as the fin or sei whales. Observers can use this trait to differentiate between species at sea. Some blue whales in the North Atlantic and North Pacific raise their tail fluke when diving. When breathing, the whale emits a vertical single-column spout, typically {{convert|9|m|ft}} high, but reaching up to {{convert|12|m|ft}}. Its lung capacity is {{convert|5000|l|USgal}}. Blue whales have twin blowholes shielded by a large splashguard.^[25]

The flippers are {{convert|3|-|4|m|ft}} long. The upper sides are grey with a thin white border; the lower sides are white. The head and tail fluke are generally uniformly grey. The whale's upper parts, and sometimes the flippers, are usually mottled. The degree of mottling varies substantially from individual to individual. Some may have a uniform slate-grey color, but others demonstrate a considerable variation of dark blues, greys and blacks, all tightly mottled.^[27]

Blue whales can reach speeds of {{convert|50|km/h|mph}} over short bursts, usually when interacting with other whales, but {{convert|20|km/h|mph}} is a more typical traveling speed.^[27] Satellite telemetry of Australian pygmy blue whales migrating to Indonesia has shown that they cover between {{convert|0.09|and|455.8|km|mi|abbr=off|sp=us}} per day.^[28] When feeding, they slow down to {{convert|5|km/h|mph}}.

Blue whales typically swim at a depth of about {{convert|13|m|ft|abbr=off|sp=us}} when migrating in order to eliminate drag from surface waves. The deepest confirmed dive is {{convert|506|m|ft|abbr=off|sp=us}}.^[29]

Blue whales most commonly live alone or with one other individual. It is not known how long traveling pairs stay together. In locations where there is a high concentration of food, as many as 50 blue whales have been seen scattered over a small area. They do not form the large, close-knit groups seen in other baleen species.

Size

Blue whales are difficult to weigh because of their size. They were never weighed whole, but cut into blocks {{convert|0.5|–|0.6|m|ft|sp=us}} across and weighed by parts.^[30] This caused a considerable loss of blood and body fluids, estimated to be about 6% of the total weight.^[31] As a whole, blue whales from the Northern Atlantic and Pacific are smaller on average than those from Antarctic waters. Adult weights typically range from {{convert|45|-|136|tonne|short ton}}.^[32] There is some uncertainty about the biggest blue whale ever found, as most data came from blue whales killed in Antarctic waters during the first half of the twentieth century, which were collected by whalers not well-versed in standard zoological measurement techniques. The standard measuring technique is to measure in a straight line from the upper jaw to the notch in the tail flukes. This came about because the edges of the tail flukes were typically cut off, and the lower jaw often falls open upon death. Many of the larger whales in the whaling records (especially those over {{convert|100|ft|m|1|abbr=on}}) were probably measured incorrectly or even deliberately exaggerated.^[22] The heaviest weight ever reported was {{convert|173|t|ST|abbr=off|-1}};^[8]^[33] for a southern hemisphere female in 1947,^[8] it is likely that the largest blue whales would have weighed over {{convert|200|ST|MT|0}}.^[22] The longest whales ever recorded were two females measuring {{convert|33.6|and|33.3|m|ft}}, but in neither of these cases was the piecemeal weight gathered.^[34] Possibly the largest recorded male was killed near the South Shetland Islands in 1926 and was measured at {{convert|31.7|m|ft|abbr=on}}.^[35]

Females are generally a few feet longer than males. However, males may be slightly heavier on average than females of the same length, owing to heavier muscles and bones.^[30] Verified measurements rarely exceed {{convert|28|m|ft}}. The longest measured by Macintosh and Wheeler (1929) was a female {{convert|28.5|m|ft}}, while the largest male was {{convert|26.45|m|ft}};^[26] one of the same authors later found a male of {{convert|26.65|m|ft}} and stated that those lengths may be exceeded.^[36] The longest whale measured by scientists was {{convert|29.9|m|ft}} long.^[8] Lieut. Quentin R. Walsh, USCG, while acting as whaling inspector of the factory ship Ulysses, verified the measurement of a {{convert|29.9|m|ft|abbr=on}} pregnant blue whale caught in the Antarctic in the 1937–38 season.^[37] A {{convert|26.8|m|ft}} male was verified by Japanese scientists in the 1947–48 whaling season.^[38] The longest reported in the North Pacific was a {{convert|27.1|m|ft}} female taken by Japanese whalers in 1959, and the longest reported in the North Atlantic was a {{convert|28|m|ft}} female caught in the Davis Strait.^[22] The average weight of the longest scientifically verified specimens ({{convert|29.9|m|ft}}) would be calculated to be 176.5 tonnes (194.6 tons), varying from 141 tonnes (155.4 tons) to 211.5 tonnes (233.1 tons) depending on fat condition.^[31]^[39] One study found that a hypothetical {{convert|33|m|ft}} blue whale would be too large to exist in real life, due to metabolic and energy constraints.^[40]

Due to its large size, several organs of the blue whale are the largest in the animal kingdom. A blue whale's tongue weighs around {{convert|2.7|tonne|short ton}}^[41] and, when fully expanded, its mouth is large enough to hold up to {{convert|90|tonne|short ton}} of food and water.^[7] Despite the size of its mouth, the dimensions of its throat are such that a blue whale cannot swallow an object wider than a beach ball.^[42] The heart of an average sized blue whale weighs {{convert|400|lb|kg}} and is the largest known in any animal.^[43] During the first seven months of its life, a blue whale calf drinks approximately {{convert|380|l|gal}} of milk every day. Blue whale calves gain weight quickly, as much as {{convert|90|kg|lb}} every 24 hours. Even at birth, they weigh up to {{convert|2700|kg|lb|-1}}—the same as a fully grown hippopotamus.^[27] Blue whales have proportionally small brains, only about {{convert|6.92|kg|lbs|sigfig=4}}, about 0.007% of its body weight,^[44] although with a highly convoluted cerebral cortex.^[35] The blue whale penis is the largest penis of any living organism^[45] and also set the Guinness World Record as the longest of any animal's.^[46] The reported average length varies but is usually mentioned to have an average length of {{convert|8|to|10|ft|order=flip|abbr=on}}.^[47]

Behaviour

Feeding

Blue whales feed almost exclusively on krill, though they also take small numbers of copepods.^[48] The species of this zooplankton eaten by blue whales varies from ocean to ocean. In the North Atlantic, Meganyctiphanes norvegica, Thysanoessa raschii, Thysanoessa inermis and Thysanoessa longicaudata are the usual food;^[49]^[50]^[51] in the North Pacific, Euphausia pacifica, Thysanoessa inermis, Thysanoessa longipes, Thysanoessa spinifera, Nyctiphanes simplex and Nematoscelis megalops;^[52]^[53]^[54] and in the Southern Hemisphere, Euphausia superba, Euphausia crystallorophias, Euphausia valentini, and Nyctiphanes australis.

An adult blue whale can eat up to 40 million krill in a day.^[55] The whales always feed in the areas with the highest concentration of krill, sometimes eating up to {{convert|3600|kg|lb}} of krill in a single day.^[48] The daily energy requirement of an adult blue whale is in the region of {{convert|1.5|e6kcal|GJ}}.^[56] Their feeding habits are seasonal. Blue whales gorge on krill in the rich waters of the Antarctic before migrating to their breeding grounds in the warmer, less-rich waters nearer the equator. The blue whale can take in up to 90 times as much energy as it expends, allowing it to build up considerable energy reserves.^[57]^[58]^[59]

Because krill move, blue whales typically feed at depths of more than {{convert|100|m|ft}} during the day and only surface-feed at night. Dive times are typically 10 minutes when feeding, though dives of up to 21 minutes are possible. The whale feeds by lunging forward at groups of krill, taking the animals and a large quantity of water into its mouth. The water is then squeezed out through the baleen plates by pressure from the ventral pouch and tongue. Once the mouth is clear of water, the remaining krill, unable to pass through the plates, are swallowed. The blue whale also incidentally consumes small fish, crustaceans and squid caught up with krill.^[60]^[61]

Life history

Mating starts in late autumn and continues to the end of winter.^[62] Little is known about mating behaviour or breeding grounds. In the fall, males will follow females for prolonged periods of time. Occasionally, a second male will attempt to displace the first, and the whales will race each other at high speed, ranging from {{convert|17|mph}} to {{convert|20|mph}} in New Zealand. This often causes the racing whales to breach, which is rare in blue whales. This racing behavior may even escalate to physical violence between the males. Scientists have observed this behavior in multiple parts of the world, including the Gulf of St. Lawrence in Canada and the South Taranaki Bight in New Zealand.^[22]^[63]

Females typically give birth once every two to three years at the start of the winter after a gestation period of 10 to 12 months.^[62] The calf weighs about {{convert|2.5|tonne|short ton}} and is around {{convert|7|m|ft}} in length. Blue whale calves drink 380–570 litres (100–150 U.S. gallons) of milk a day. Blue whale milk has an energy content of about 18,300 kJ/kg (4,370 kcal/kg).^[64] The calf is weaned after six months, by which time it has doubled in length. The first video of a calf thought to be nursing was filmed on 5 February 2016.^[65] Blue whales have been occasionally known to hybridize with fin whales, and a well-documented case exists of a humpback-blue whale hybrid in the South Pacific, despite the considerable differences in size and morphology between the two species.^[66]

Sexual maturity is typically reached at five to ten years of age. In the Northern Hemisphere, whaling records show that males averaged {{convert|20|–|21|m|ft|abbr=on}} and females {{convert|21|–|23|m|ft|abbr=on}} at sexual maturity,^[67] while in the Southern Hemisphere it was {{convert|22.6|and|24|m|ft|abbr=on}}, respectively.^[68] In the Northern Hemisphere, as adults, males averaged {{convert|24|m|ft|abbr=on}} and females {{convert|25|m|ft|abbr=on}} with average calculated weights of 90.5 and 101.5 tonnes (100 and 112 tons), respectively.^[31] Blue whales in the eastern North Pacific population were found to be on average {{convert|0.91|m|ft|abbr=off|sp=us}} shorter,^[69] therefore with males averaging {{convert|23.3|m|ft|abbr=off|sp=us}} and 80.5 tonnes (88.5 tons) and females {{convert|24|m|ft|abbr=off|sp=us}} and 90.5 tonnes (100 tons).^[31] Antarctic males averaged {{convert|25|m|ft|abbr=on}} and females {{convert|26.2|m|ft|abbr=on}},^[39]^[67]^[68] averaging 101.5 and 118 tonnes (112 and 130 tons).^[31] Pygmy blue whales average {{convert|19.2|m|ft|abbr=off|sp=us}} at sexual maturity, with males averaging 21 meters and females 22 meters (69 and 72 feet) when fully grown,^[70] averaging 76 and 90 tonnes (83.5 and 99 tons).^[31]

In the eastern North Pacific, photogrammetric studies have shown sexually mature (but not necessarily fully grown) blue whales today average {{convert|21.7|m|ft|abbr=on}}, and about 65.5 tonnes (72 tons)^[31] with the largest found being about {{convert|24.5|m|ft|abbr=on}}.^[71] A {{convert|26.5|m|ft|abbr=on}} female washed ashore near Pescadero, California in 1979.^[72]

The weight of individual blue whales varies significantly according to fat condition. Antarctic blue whales gain 50% of their lean body weight in the summer feeding season, i.e. a blue whale entering the Antarctic weighing 100 tons would leave weighing 150 tons. Pregnant females probably gain 60–65%. The fattened weight is 120% the average weight and the lean weight is 80%.^[39]

Scientists estimate that blue whales can live for at least 80 years,^[34]^[62]^[73] but since individual records do not date back into the whaling era, this will not be known with certainty for many years. The longest recorded study of a single individual is 34 years, in the eastern North Pacific.^[74]

The whales' only natural predator is the orca.^[75] Studies report that as many as 25% of mature blue whales have scars resulting from orca attacks.^[34] The mortality rate of such attacks is unknown.

Strandings

Blue whale strandings are extremely uncommon, and, because the species is largely solitary, mass strandings are unheard of.^[76] When strandings do occur, they can become the focus of public interest. In 1920, a blue whale washed up near Bragar on the Isle of Lewis in the Outer Hebrides of Scotland. It had been shot by whalers, but the harpoon had failed to explode. As with other mammals, the fundamental instinct of the whale was to try to carry on breathing at all costs, even though this meant beaching to prevent itself from drowning. Two of the whale's bones were erected just off a main road on Lewis and remain a tourist attraction.^[77]

In June 2015, a female blue whale estimated at {{convert|12.2|m|ft|abbr=off|sp=us}} and 20 tonnes (22 tons) was stranded on a beach in Maharashtra, India, the first live stranding in the region. Despite efforts by the Albaug forest department and local fishermen, the whale died 10 hours after being stranded.^[78] In August 2009, a wounded blue whale was stranded in a bay in Steingrímsfjördur, Iceland. The first rescue attempt failed, as the whale (thought to be over 20 meters long) towed the >20 ton boat back to shore at speeds of up to {{convert|7|mph}}. The whale was towed to sea after 7 hours by a stronger boat. It is unknown whether it survived.^[79] In December 2015, a live blue whale thought to be over {{convert|20|m|ft|abbr=off}} long was rescued from a beach in Chile.^[80] Another stranded blue whale, thought to be about {{convert|12.2|m|ft|abbr=off}} long, was rescued in India in February 2016.^[81] Boats were used in all successful cases.

Vocalizations

Estimates made by Cummings and Thompson (1971) suggest the source level of sounds made by blue whales are between 155 and 188 decibels when measured relative to a reference pressure of one micropascal at one metre.^[82]^[83] All blue whale groups make calls at a fundamental frequency between 10 and 40 Hz; the lowest frequency sound a human can typically perceive is 20 Hz. Blue whale calls last between ten and thirty seconds. Blue whales off the coast of Sri Lanka have been repeatedly recorded making "songs" of four notes, lasting about two minutes each, reminiscent of the well-known humpback whale songs. As this phenomenon has not been seen in any other populations, researchers believe it may be unique to the B. m. brevicauda (pygmy) subspecies. The loudest sustained noise from a blue whale was at 188 dB.^[84]

The purpose of vocalization is unknown. Richardson et al. (1995) discuss six possible reasons:^[85]

Population and whaling

Hunting era

Blue whales are not easy to catch or kill. Their speed and power meant that they were rarely pursued by early whalers, who instead targeted sperm and right whales.^[86] In 1864, the Norwegian Svend Foyn equipped a steamboat with harpoons specifically designed for catching large whales.^[27] The harpoon gun was initially cumbersome and had a low success rate, but Foyn perfected it, and soon several whaling stations were established on the coast of Finnmark in northern Norway. Because of disputes with the local fishermen, the last whaling station in Finnmark was closed down in 1904.

Soon, blue whales were being hunted off Iceland (1883), the Faroe Islands (1894), Newfoundland (1898), and Spitsbergen (1903). In 1904–05 the first blue whales were taken off South Georgia. By 1925, with the advent of the stern slipway in factory ships and the use of steam-driven whale catchers, the catch of blue whales, and baleen whales as a whole, in the Antarctic and sub-Antarctic began to increase dramatically. In the 1930–31 season, these ships caught 29,400 blue whales in the Antarctic alone.^[87] By the end of World War II, populations had been significantly depleted, and, in 1946, the first quotas restricting international trade in whales were introduced, but they were ineffective because of the lack of differentiation between species. Rare species could be hunted on an equal footing with those found in relative abundance.

All of the historical coastal Asian groups were driven to near-extinction in short order by Japanese industrial hunts.^[89] Those groups that once migrated along western Japan to the East China Sea were likely wiped out much earlier, as the last catches on Amami Ōshima were between the 1910s and the 1930s,^[90] and the last known stranding records on the Japanese archipelago, excluding the Ryukyu Islands, were over a half-century ago. Commercial catches were continued until 1965 and whaling stations targeting blues were mainly placed along the Hokkaido and Sanriku coasts.^[89]

Blue whale hunting was banned in 1966 by the International Whaling Commission,^[91]^[92] and illegal whaling by the Soviet Union finally halted in the 1970s,^[93] by which time 330,000 blue whales had been caught in the Antarctic, 33,000 in the rest of the Southern Hemisphere, 8,200 in the North Pacific, and 7,000 in the North Atlantic. The largest original population, in the Antarctic, had been reduced to a mere 360 individuals, about 0.15% of their initial numbers.^[9]

Population and distribution today

Since the introduction of the whaling ban, studies have examined whether the conservation reliant global blue whale population is increasing or remaining stable. In the Antarctic, best estimates show an increase of 7.3% per year since the end of illegal Soviet whaling, but numbers remain at under 1% of their original levels.^[9] Recovery varies regionally, and the Eastern North Pacific blue whale population (historically a relatively small proportion of the global total) has rebounded to about 2,200 individuals, an estimated 97% of its pre-hunting population.^[95]

The total world population was estimated to be between 5,000 and 12,000 in 2002; there are high levels of uncertainty in available estimates for many areas.^[8] A more recent estimate by the IUCN puts the global population at 10,000–25,000.^[4]

The IUCN Red List counts the blue whale as "endangered", as it has since the list's inception. In the United States, the National Marine Fisheries Service lists them as endangered under the Endangered Species Act.^[96] The largest known concentration, consisting of about 2,800 individuals, is the northeast Pacific population of the northern blue whale (B. m. musculus) subspecies that ranges from Alaska to Costa Rica, but is most commonly seen from California in summer.^[97] Infrequently, this population visits the northwest Pacific between Kamchatka and the northern tip of Japan.

North Atlantic

In the North Atlantic, two stocks of B. m. musculus are recognised. The first is found off Greenland, Newfoundland, Nova Scotia and the Gulf of Saint Lawrence. This group is estimated to total about 500. The second, more easterly group is spotted from the Azores in spring to Iceland in July and August; it is presumed the whales follow the Mid-Atlantic Ridge between the two volcanic islands. Beyond Iceland, blue whales have been spotted as far north as Spitsbergen and Jan Mayen, though such sightings are rare. Scientists do not know where these whales spend their winters. The total North Atlantic population is estimated to be between 600 and 1,500. Off Ireland, the first confirmed sightings were made in 2008,^[98] since then Porcupine Seabight has been regarded as a prominent habitat for the species along with fin whales. One was sighted along Galicia, Spain, in 2017.^[99]

Occasionally blue whales get lost in the Baltic Sea. The remnants of two blue whales have been identified in Finland.^[100] One 19-meter skeleton was found on the bottom of the Gulf of Finland during the construction of Nord Stream pipeline.^[101] The vertebrae of a second individual were recovered from a field near Pori on the coast of the Bothnian Sea in 1942 and identified in the Copenhagen Zoological Museum by Magnus Degerbøl.^[100] Radiocarbon dating revealed the former had wandered into the Littorina Sea over 7000 years ago and perished, while the latter bones were shown to be 800–900 years old.^[102]

North Pacific

Five or more subpopulations have been suggested, and several of these mainly in the western North Pacific have been considered either functionally or virtually extinct.^[103] Of the populations that once existed off coastal Japan, the last recorded confirmed stranding was in the 1910s.^[104] Today, call types suggest only two populations in the North Pacific.^[22] Some scientists regard that historical populations off Japan were driven to extinction by whaling activities, mostly from the Kumanonada Sea off Wakayama, in the Gulf of Tosa, and in the Sea of Hyūga. Nowadays, possible vagrants from either eastern or offshore populations are observed on very rare occasions off Kushiro.^[105] There were also small, but constant catch records around the Korean Peninsula and in the coastal waters of the Sea of Japan; this species is normally considered not to frequent into marginal seas, such as the Sea of Okhotsk, on usual migrations. Whales were known to migrate further north to eastern Kamchatka, the Gulf of Anadyr, off Abashiri or the southern Sea of Okhotsk,^[106] and the Commander Islands. Only three sightings were made between 1994 and 2004 in Russia^[107] with one sighted off east coast of the peninsula in 2009,^[159] and the last known occurrence in the eastern Sea of Okhotsk was in 1948.^[108] In addition, whales have not been confirmed off the Commander Islands for over past 80 years.^[109] In 2017, 13 or more whales were observed off Kamchatka and Commander Islands.^[110]^[111]^[112] Historically, wintering grounds existed off the Hawaiian Archipelago, the Northern Mariana Islands, the Bonin Islands and Ryukyu Islands, the Philippines, Taiwan, the Zhoushan Archipelago, and the South China Sea^[113] such as in Daya Bay, off the Leizhou Peninsula, and off Hainan Island, and further south to the Paracel Islands.^[114] A stranding was recorded in Wanning in 2005.^[115] One whale was sighted off Weizhou Island in 2017.^[116] For further status in Chinese and Korean waters, see Wildlife of China.

By 2014, the eastern North Pacific blue whale population had rebounded to an estimated 2,200 individuals, which is thought to be about 97% of its pre-whaling numbers.^[10]

Southern Hemisphere and vicinity to Northern Indian Ocean

In the Southern Hemisphere, there appear to be two distinct subspecies, B. m. intermedia, the Antarctic blue whale, and the little-studied pygmy blue whale, B. m. brevicauda, found in Indian Ocean waters. The most recent surveys (midpoint 1998) provided an estimate of 2,280 blue whales in the Antarctic^[117] (of which fewer than 1% are likely to be pygmy blue whales).^[118] Estimates from a 1996 survey show that 424 pygmy blue whales were in a small area south of Madagascar (the Madagascar Plateau)^[119] alone,^[120] thus it is likely that numbers in the entire Indian Ocean are in the thousands. If this is true, the global numbers would be much higher than estimates predict.^[121] However, slower reproduction rate of the species, along with the impacts of whaling, may affect population recoveries as the total population size is predicted to be at less than 50% of its pre-whaling state by 2100.^[122]

Several congregating grounds are recently confirmed in Oceania, such as Perth Canyon off Rottnest Island, the Great Australian Bight off Portland, and in South Taranaki Bight and off Kahurangi Point^[123] which was discovered just in 2007 and was confirmed in 2014, representing possibly a unique population based on haplotypes.^[124]^[125] Southern blue and pygmy blue females use waters off Western Australia, and coastal areas of eastern North Island of New Zealand, from Northland waters such as the Bay of Islands and Hauraki Gulf to the Bay of Plenty in the south, as breeding and calving grounds. Whales off southern and western Australia are known to migrate into tropical coastal waters in Indonesia,^[126] Philippines,^[127] and off East Timor.^[128] (Animals in the Philippines may or may not originate from North Pacific populations or from a pygmy blue population in the northern Indian Ocean as whales regularly appear off Bohol,^[129] north of the Equator.^[130]^[131]) At least on occasions, whales also migrate through remote islands such as Cook Islands,^[132]^[133]^[134] and Chilean pelagic waters adjacent to Easter Island and Isla Salas y Gómez, where possibilities of undiscovered wintering grounds have been considered.^[135]

Blue whales also migrate through western African waters such as off Angola^[136]^[137] and Mauritania,^[138] and at least whales around Iceland are known to migrate to Mauritania.^[139]

Subspecies' distribution

A fourth subspecies, B. m. indica, was identified by Blyth in 1859 in the northern Indian Ocean, but is now thought to be the same subspecies as B. m. brevicauda, the pygmy blue whale. Records for Soviet catches seem to indicate that the female adult size is closer to that of the pygmy blue than B. m. musculus; the populations of B. m. indica and B. m. brevicauda appear to be discrete, and the breeding seasons differ by almost six months.^[140] Along mainland Indian coasts, appearances of whales had been scarce excluding unconfirmed record(s),^[141] the first blue whale since after the last stranding record in Maharashtra in 1914, was sighted off Kunkeshwar along with several Bryde's whales in May 2015.^[142]^[143]^[144]

Migratory patterns of these subspecies are not well known. For example, pygmy blue whales have been recorded in the northern Indian Ocean (Oman, Maldives and Sri Lanka),^[145] where they may form a distinct resident population.^[140] Furthermore, sightings have been recorded from elsewhere in and adjacent to Arabian Sea, including from Gulf of Aden, Persian Gulf, coasts of Bay of Bengal including Bangladesh to Myanmar, and within the Strait of Malacca.^[146]^[147] The first official confirmation within Thailand's EEZ occurred at Trang in 2013.^[148]

In addition, the population of blue whales occurring off Chile and Peru may also be a distinct subspecies. Some Antarctic blue whales approach the eastern South Atlantic coast in winter, and occasionally, their vocalizations are heard off Peru, Western Australia, and in the northern Indian Ocean.^[140] In Chile, the Cetacean Conservation Center, with support from the Chilean Navy, is undertaking extensive research and conservation work on a recently discovered feeding aggregation of the species off the coast of Chiloe Island in the Gulf of Corcovado (Chiloé National Park), where 326 blue whales were spotted in 2007.^[149] In this regions, it is normal for blue whales to enter Fiords. Whales also reach southern Los Lagos, such as off Caleta Zorra, live along with other rorquals.

Efforts to calculate the blue whale population more accurately are supported by marine mammologists at Duke University, who maintain the Ocean Biogeographic Information System—Spatial Ecological Analysis of Megavertebrate Populations (OBIS-SEAMAP), a collation of marine mammal sighting data from around 130 sources.^[150]

Threats other than hunting

Due to their enormous size, power and speed, adult blue whales have virtually no natural predators. There is one documented case in National Geographic Magazine of a blue whale being attacked by orcas off the Baja California Peninsula; the orcas were unable to kill the animal outright during their attack, but the blue whale sustained serious wounds and probably died as a result of them shortly after the attack.^[151] In March 2014, a pack of orcas harassed a blue whale off California, with one of them biting the tip of the blue whale's tail fluke. The blue whale attempted to tail slap the orca and fled at high speed.^[152] A similar incident happened on May 18, 2017 in Monterey Bay, with the orcas swimming in a line up to the blue whale's side. The blue whale fled and escaped. Orcas have virtually no chance against an adult blue whale, but may attack them on occasion anyway for their own enjoyment.^[153] Up to a quarter of the blue whales identified in Baja bear scars from orca attacks.^[22]

Blue whales may be wounded, sometimes fatally, after colliding with ocean vessels, as well as becoming trapped or entangled in fishing gear.^[211] Ship strikes in particular have killed many blue whales in California.^[154] In September 2007, three dead blue whales washed up in southern California after being killed by ship strikes.^[22] A similar incident occurred in northern California in 2017, possibly also 2010.^[155]^[156] Ship strikes are also a serious problem in Sri Lanka, and scientists believe this problem could be nearly eliminated by moving the shipping lanes 15 nautical miles to the south.^[157] The ever-increasing amount of ocean noise, including sonar, drowns out the vocalizations produced by whales, which makes it harder for them to communicate.^[158]^[211] Blue whales stop producing foraging D calls once a mid-frequency sonar is activated, even though the sonar frequency range (1–8 kHz) far exceeds their sound production range (25–100 Hz).^[158] Research on blue whales in the Southern California Bight has shown that mid-frequency sonar use interferes with foraging behavior, sometimes causing the whales to abandon their feeding.^[159] Human threats to the potential recovery of blue whale populations also include accumulation of polychlorinated biphenyl (PCB) chemicals within the whale's body.^[7]

With global warming causing glaciers and permafrost to melt rapidly and allowing a large amount of fresh water to flow into the oceans, there are concerns that if the amount of fresh water in the oceans reaches a critical point, there will be a disruption in the thermohaline circulation.^[160] Considering the blue whale's migratory patterns are based on ocean temperature, a disruption in this circulation, which moves warm and cold water around the world, would be likely to have an effect on their migration.^[161] The whales summer in the cool, high latitudes, where they feed in krill-abundant waters; they winter in warmer, low latitudes, where they mate and give birth.^[162]

The change in ocean temperature would also affect the blue whale's food supply. The warming trend and decreased salinity levels would cause a significant shift in krill location and abundance.^[163]

In popular culture

Before modern whaling began in the late 19th century, blue whales were obscure and very poorly understood. They, along with other large whales were mythologized and indistinguishable from sea monsters. Even after the first specimens were described, the blue whale went by many names and scientists often described their specimens as new species. Descriptions and illustrations were inaccurate. The taxonomy was eventually resolved, but many mysteries remained.^[22]^[35]

The blue whale rose from relative obscurity in the 1970s, after the release of the Songs of the Humpback Whale. The difference between the humpback and the blue whale was not well known to most people, who conflated the species in their minds. To many listeners, the haunting songs seemed like a cry for help. Environmentalists developed the image of a lonely blue whale singing out in an empty ocean, since whalers had nearly hunted the species to extinction.^[22]

Today, the blue whale is renowned for being the largest animal ever to have lived. In part because of its legendary status, many misconceptions still exist. For example, its size is often exaggerated. Many popular sources give the maximum length as {{convert|110|ft|m|abbr=off|sp=us}} or more. While such lengths were reported in the whaling records, they were not scientifically verified and were probably exaggerated. Virtually all books and articles that mention the blue whale claim that it can reach {{convert|100|ft|m|abbr=off|sp=us}}. This is probably true (the largest verified specimen was {{convert|30|m|ft|abbr=off|sp=us|disp=comma}}^[8]) but is highly misleading as the average size is much smaller.^[22]^[164]

The global population was reduced by more than 99% during the 20th century.^[165] Most of this was in the Antarctic, which had been reduced to 360 individuals or about 0.15% of their original numbers; other populations were not as badly depleted. The Antarctic blue whale population is growing at the relatively rapid rate of about 7.3% per year, but it was hunted to such a low level that it remains at a tiny fraction of pre-whaling numbers.^[9] The global population still requires protection, but it is not in immediate danger of extinction.^[22]

Other myths and misconceptions include that the blue whale's arteries can be swum through, that the heartbeat can be heard from 19 miles away, and that the blue whale penis is 16 feet long.^[22]

Museums

The Natural History Museum in London contains a famous mounted skeleton and life-size model of a blue whale, which were both the first of their kind in the world, but have since been replicated at the University of California, Santa Cruz. Similarly, the American Museum of Natural History in New York City has a full-size model in its Milstein Family Hall of Ocean Life. A juvenile blue whale skeleton named KOBO is installed at the New Bedford Whaling Museum in New Bedford, Massachusetts.

The Aquarium of the Pacific in Long Beach, California, features a life-size model of a mother blue whale with her calf suspended from the ceiling of its main hall.^[166] The Beaty Biodiversity Museum at the University of British Columbia, Canada, houses a display of a blue whale skeleton (skull is cast replica) directly on the main campus boulevard.^[167] A real skeleton of a blue whale at the Canadian Museum of Nature in Ottawa was also unveiled in May 2010.^[168] The Royal Ontario Museum obtained a blue whale, which died in Newfoundland and Labrador in 2014, and began an exhibition in 2016 to display its skeleton in Toronto.^[169]

The Museum of Natural History in Gothenburg, Sweden, contains the only stuffed blue whale in the world, with its skeleton mounted beside it. Two skeletons are held in Ukraine: in Odessa and Kherson.^[170]

The Melbourne Museum and Museum of New Zealand Te Papa Tongarewa^[171] both feature a skeleton of the pygmy blue whale. The North Carolina Museum of Natural Sciences in Raleigh, North Carolina, has a mounted skeleton of a blue whale.

The South African Museum in Cape Town features a hall devoted to whales and natural history known as the Whale Well. The centrepiece of the exhibit is a suspended mounted blue whale skeleton, from the carcass of a partially mature specimen that washed ashore in the mid 1980s. The skeleton's jaw bones are mounted on the floor of Whale Well to permit visitors direct contact with them, and to walk between them so as to appreciate the size of the animal. Other mounted skeletons include that of a humpback whale and a right whale, together with in-scale composite models of other whales, dolphins and porpoises.

The Tokyo National Museum in Ueno Park displays a life-sized model of a blue whale in the front. Several other institutions such as Tokai University and Taiji Whale Museum hold skeletons or skeleton models of Pygmy blue whales, while several churches and buildings in western Japan including Nagasaki Prefecture display the jawbone of captured animals as a gate.

Whale-watching

Blue whales may be encountered (but rarely) on whale-watching cruises in the Gulf of Maine^[172] and are the main attractions along the north shore of the Gulf of Saint Lawrence and in the Saint Lawrence estuary.^[173] Blue whales can also be seen off Southern California, starting as early as March and April, with the peak between July and September.^[174] More whales have been observed close to shore along with fin whales.

In Chile, the Alfaguara project combines conservation measures for the population of blue whales feeding off Chiloé Island with whale watching and other ecotourism activities that bring economic benefits to the local people.^[175]

Whale-watching, principally blue whales, is also carried out south of Sri Lanka.^[176] Whales are widely seen along the coast of Chile and Peru near the coast, occasionally making mixed groups with fin, sei, and Bryde's whales.

See also

References

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