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🧳 | Butterflies traveling thousands of kilometers Chestnut tiger Toin's Fujibakama field also has eggs


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Butterflies traveling thousands of kilometers Chestnut tiger Toin's Fujibakama field also has eggs

 
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3 third and fourth graders participated in the observation session, and after learning about the chestnut tiger traveling thousands of kilometers, the chestnut tiger that came flying in earnest from the beginning of October in the flower field of Fujibakama where about 4 plants bloom. I observed.
 

On the 14th, an observation party of Chestnut tiger known as a traveling butterfly was held in the flower field of Fujibakama in Toin Town, Mie Prefecture. → Continue reading

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Asagi Madara

Asagi Madara(Shallow spots,scientific name : Parantica sita) IsLepidopteraNymphalidaeTiger butterfly subfamilyToSortBe doneButterfly1種.wingA large butterfly with a bright pattern, which travels long distances.

Features

AdultFore wing length is 5-6 cmAbout.The inside of the wing is whitish, and a black wing vein runs.Strictly speaking, this whitish part is translucent light blue.ScalesLess is.Japanese nameIt is in"Asagi"Is an old name for blue-green, which is derived from the color of this part.On the outside of the wing, the front wing is black and the rear wing is brown, and translucent light blue spots are also lined up here.

It is difficult to distinguish between males and females, but males are on the tip of the abdomen.PheromoneHas an organ that secretes.Also, when the wings are closed, there may be dark brown spots on the part that hits the tail, but this is a sex vote and is not found in females.This makes it possible to identify females and males.

Swallowtail butterflyIt flies fluffy without flapping its wings, and is popular because it is often seen without being afraid of people.Entomological Society of JapanWhen selecting a national butterfly bySwallowtail butterfly,BluebottleWas selected as a candidate along with others, but in the endOmurasakiWas selected.From summer to autumnFujibakama,Eupatorium,ア ザ ミSuch asAsteraceaeOf the plantflowerYou can see them gathering together and sucking honey.

JapaneseNansei IslandsDistributed from to Southeast AsiaRyukyu Asagi MadaraIs a butterfly of another genus that belongs to the name "Chestnut tiger".

Life history

Larva TheAsclepiadaceae OfKijoran,Ikema, Etc.Herbivorousage,eggIs laid on the back of the leaves of the herbivore.The larva has four rows of yellow spots on a black background, and many white spots around it.Also, two blacks on the precordium and tailCornerHave.KantoIn the vicinity of the coastal areas west of the west, when winter approachesEvergreenIt lays eggs on the marsdenia tomentosa, and overwinters with larvae of about 2 to 3 instars.pupaIs a pupal type and is hung upside down only at the tail.The pupa is turquoise,Metallic lusterThere are black spots.All Asclepiadaceae plants that feed on larvaepoisonStrong sexalkaloidincluding.Chestnut tiger poisons by taking in these alkaloids and protects itself from enemies.Chestnut tigers have bright body colors such as larvae, pupae, and adults, but this informs the enemy that they have poison.AposematismIt is believed that.In addition, Eupatorium japonicum and Eupatorium japonicum, where adult males often gather,Heliotropium japonicumEtc.Pyrrolizidine alkaloid(PA) is included, malesSex pheromonesIngestion of pyrrolizidine alkaloids is thought to be necessary for secretion[1].

IndiaFrom the northSoutheast Asia,IndonesiaOf the swallowtail butterfly that is distributed over Chilasa agestor The wing pattern is very similar to the chestnut tiger.This is a poisonous chestnut tigerMimicry(Batesian mimicry), It is thought that it protects itself from being eaten by the enemy.[2].

distributed

JapanFrom all overKorean Peninsula,Chugoku,Taiwan,HimalayasWidely distributed.Some in the distribution areaSubspeciesOf these, the subspecies that are distributed in Japan P. s. niphonica It is said that

Many inhabit high altitude mountains.KyusyuAdults can be seen north of May from May to October,Nansei IslandsOn the contrary, it can be seen from autumn to winter.

mobile

Many adult Chestnut tiger migratory individuals have been found in the fall from mainland Japan to the Nansei Islands and Taiwan, or a small number of individuals have been found moving north on the opposite course from early summer to summer. ..Since larvae overwinter in the warm regions of the Pacific coast of mainland Japan and in Chushikoku and Kyushu, it is presumed that most of the individuals observed in Honshu from spring to early summer have emerged in the mainland.

In the study of migration, the place of capture, date, contact information, etc. are displayed on the translucent part of the wing of the captured adult wing.Magic inkBy filling in (marking) with and releasing butterfliesIndividual identificationHas been done.What in what day, depending on the place, date and time when this marked individual was captured again kmYou can see how many days you have been there if you have moved or captured there."Chestnut tiger net" for investigation[3] OfインターネットThere is an electronic network by, and you may be able to check the movement information on the same day.[4]..White as a means of capture for investigationTowelIt is known that the chestnut tiger approaches when you grab one and turn it around.It is easier to catch if you hold the net with your dominant hand and turn the towel with your other hand.

Researchers have found that many of the Chestnut tigers that occurred in mainland Japan in the summer travel south to the Nansei Islands and Taiwan in the fall, but some have been found to be overwintering in groups or dead in large numbers. Not.It has become clear that many individuals that breed in the Nansei Islands or overwinter larvae in warm regions of the mainland tend to move north for breeding in the next cool regions of the mainland after emergence in spring.

Some individuals have traveled more than 1,500 km in a straight line in the south of this fall, while others have traveled more than 1 km per day.As a concrete example, in 200,GifuGero CityWith the person who released the butterflyHyogoTakarazukaThe person who caught the individual was the same person for two years in a row.The individual was released in late September and was caught on October 2.[5].

"Chestnut tiger" released by "Donan Mushi no Kai" from a mountain near Hakodate City, Hokkaido on August 2011, 8, is a butterfly of Toyoura, a city park and refresh park in Shimonoseki City, Yamaguchi Prefecture on October 19, 2011. He flew to the garden "Butterfly Inn" and was captured.

XNUM X Year X NUM X Month X NUM X DayWakayamaThe marked Chestnut tiger released from the tiger was about 83 km away on December 12, 31 days later.Hong KongWas captured in.in the middleKochiBut it was captured and confirmed to be the second long-distance move in the world.[6][7].

Since the introduction of the Chestnut tiger migration in the children's pictorial book, it has been said that all the individuals observed in mainland Japan from spring to early summer come from the southwestern islands, which is a mistake.

Beginning of research

Marking surveys began in the early 1980s, with the idea that the butterflies might be moving seasonally.It is said that all such ideas were submitted by those who had experience of staying in Okinawa.Kunio Nagamine moved to the main island of Okinawa around 1962-63 because no larvae or adults were found in the southern part of the island, and adults were rarely seen in the northern part of the central part, and there was no evidence of colonization. I thought about the possibility of being there.Kazuhiko Morishita has spent his childhood in Okinawa, and in 1980, a general paper on this species was not seen at all in the summer, there were no fresh individuals in the fall, and on the contrary it was fresh in the spring. It was pointed out that this species belongs to tropical butterflies as a group, but has an exceptional distribution in the north and tends to dislike intense heat, indicating that it may also be migrating. rice field.Hiroshi Tanaka of the Kagoshima Insects Club, which was influenced by Nagamine, strongly felt the possibility that he was moving because the number of individuals increased in the spring even though no large wintering group was seen.Therefore, Tanaka asked for guidance from Haruo Fukuda of the Kagoshima Prefectural Museum, and decided to investigate the movement of this species, assuming a southward movement in the fall and a northward movement in the spring.The experiment started in August 1980, and the following year, long-distance travel to the south and north was confirmed.Knowing this, Isamu Hiura of the Osaka Museum of Natural History launched the "Chestnut tiger research group" and published "Chestnut tiger information".Initially, it was difficult to recapture the marked individuals, but after that, as clubs and other organizations began to carry out marking activities, the number of recaptures increased, and it became possible to understand even small movements.[8].

Conservation status evaluation

Chiba OfRed listでNear endangeredIt is evaluated as[9].

Related species

footnote

References

  • Eiji Sato "Mystery of Butterfly Crossing the Sea"Mountains and valleys, February 2006.ISBN 4635063437.
  • Toshio Inomata (ed. / Commentary), Katsuomi Matsumoto (photo) "Butterfly" Yama-kei Publishers <New Edition Yama-kei Field Books>, June 2006, p. 6.ISBN 4-635-06062-4.
  • Nobuo Morikami and Masayuki Hayashi "Handbook of Insect Eating Grass and Eating Trees"Bunichi General Publishing, 2007,ISBN 978-4-8299-0026-0
  • Masahiro Kurita, "Why does the mysterious butterfly Asagi Madara cross the sea?" , (2013), PHP Institute

Related item

  • Monarch butterfly --A member of the Madara butterfly, traveling long distances in North America
  • Madara Asagi --A writer whose pen name is this name

外部 リンク

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