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Lepidoptera migration

lepidoptera migration assistant, lepidoptera migration policy
Many populations of Lepidoptera butterflies or moths migrate, sometimes long distances, to and from areas which are only suitable for part of the year Lepidopterans migrate on all continents except Antarctica, including from or within subtropical and tropical areas By migrating, these species can avoid unfavorable circumstances, including weather, food shortage, or over-population In some lepidopteran species, all individuals migrate; in others, only some migrate

The best-known Lepidopteran migration is that of the eastern population of the Monarch butterfly which migrates from southern Canada to wintering sites in central Mexico In late winter/early spring, the adult monarchs leave the Transvolcanic mountain range in Mexico for a more northern climate Mating occurs and the females begin seeking out milkweed to lay their eggs, usually first in northern Mexico and southern Texas The caterpillars hatch and develop into adults that move north, where more offspring can go as far as Central Canada until next migratory cycle

The Danaids in South India are prominent migrants, between Eastern Ghats and Western Ghats Three species will be involved in this, namely Tirumala septentrionis, Euploea core, and Euploea sylvester Sometimes they are joined by Lemon Pansy Junonia lemonias, Common Emigrant Catopsilia pomona, Tawny coster Acraea terpsicore and Blue Tiger Tirumala limniace

Contents

  • 1 Definition
    • 11 Adventive
    • 12 Seasonal migration
      • 121 Difference with bird migration
  • 2 Flight behaviour
    • 21 Navigation
  • 3 Areas where migratory butterflies and moths can be found
    • 31 Examples of migratory Lepidoptera
      • 311 Example species:Macroglossum stellatarum
  • 4 Causes
    • 41 Migration and evolution
  • 5 Recording
  • 6 Migration and climate change
  • 7 See also
  • 8 Footnotes
  • 9 References

Definition

Migration in Lepidoptera means a regular, predictable movement of a population from one place to another, determined by the seasons There is no unambiguous definition of migratory butterfly or migratory moth, and this also applies to proposals to divide them into classes Migration means different things to behavioral scientists and ecologists The former emphasize the act of moving whereas the latter discriminate between whether the movement has been ecologically significant or not Migration may be viewed as "a behavioural process with ecological consequences"

Migration in Lepidoptera takes place in two of the three modes of migration identified by Johnson Johnson, 1969 In the first mode also Johnson's first, the Lepidoptera move in one direction in their short life-span and do not return An example is the pierid butterfly, Ascia monuste, which breeds in Florida but sometimes migrates along the coast up to 160 kilometers to breed in more suitable areas

In the second mode Johnson's third, migration takes place to a place of hibernation or aestivation where they undergo diapause and the same generation survives to return The classic example is that of the nymphalid Monarch butterfly Danuas plexippus

Adventive

Species that are recorded in unexpected areas adventive species are not considered to be migratory species, because these did not leave their habitat on their own strength Examples are species that are imported as egg or caterpillar alongside of their host plants or individuals that were reared by a collector but have escaped An example of an introduced species is Galleria mellonella, which is found all over the world, because it is reared as food for captive birds and reptiles At times it is difficult to decide if a species is adventive or migratory Migratory species like Chrysodeixis chalcites and Helicoverpa armigera would be able to reach Western Europe on their own, but are also common in greenhouses

Seasonal migration

Australian species Agrotis infusa spends the summer as an imago in the Australian Alps, and is sometimes found in buildings in large numbers

Lepidoptera migration is often seasonal With species of which all individuals migrate, the population moves between areas in the summer and winter season or the dry and wet season

For species of which only part of the population migrates, seasonal migration is hard to determine They can maintain themselves in part of their habitat but also reach areas where they cannot establish a permanent population They only live there in the season that is most favorable for the species Some of the species have the habit of returning to their permanent residence at the end of the season

Difference with bird migration

An important difference with bird migration is that an individual butterfly or moth usually migrates in one direction, while birds migrate back and forth multiple times within their lifespan This is due to the short lifespan as an imago Amazingly the Monarch receives no navigation instruction for the migration from their parents, unlike birds Species that migrate back and forth, usually do so in different generations There are however, some exceptions:

  • The famous migration of the Monarch butterfly in North America This species migrates back and forth in one generation, though it completes only part of the journey in both directions in that generation No individual completes the entire journey which is spread over a number of generations The imago of the last summer generation is born in North America, migrates to Mexico, Florida, or California and stays there for the winter After the winter it migrates back to the north to reproduce In a couple of generations, the monarch migrates north to Canada
  • The migration of Agrotis infusa in Australia This species migrates from south-eastern Australia to the Australian Alps in the summer to avoid the heat After the summer it returns to reproduce

Flight behaviour

The small Diamondback moth is a migratory species which can be found at altitudes of a 100 meters It is capable of covering over 3,000 kilometers

Migratory Lepidoptera are, in most cases, excellent flyers Species like the Vanessa atalanta are capable of managing a fierce headwind In case of headwind, they usually fly low and are more goal-oriented During migration, some species can be found on high altitudes, ranging to up to two kilometersThis is especially noteworthy for day-flying species like Vanessa atalanta, since the temperatures on these altitudes are low and day-flying species depend on the outside temperature to stay warm It is thought that Vanessa atalanta produces enough body warmth during flight since it has also been recorded migrating at night

In the case of transcontinental migration where distances are large, the flying speed of the butterflyof the order of 3 metres per second or less is inadequate for timely completion of journey The migration is carried out by relying on heavy winds; a persistent wind speed of 10 metres per second being able to provide a displacement of 300 to 400 kilometers in a single day For example, the Painted Lady Vanessa cardui migrates from Africa to Spain aided by tail winds

That the migratory species are good flyers, is not the same as saying they are robust flyers The small Diamondback moth is also a migratory species that migrates 3,000 kilometers and can be found up to altitudes of 100 meters or more

Navigation

To be able to migrate over long distances, species must be able to navigate There are several ways they do this

Landscape:Lepidoptera use coastal lines, mountains, but also man-made roads to orient themselves Above sea it has been observed that the flight direction is much more accurate if the landscape on the coast is still visible

Celestial navigation:Butterflies are known to be capable of navigation with the help of the sun They can also navigate by using polarized light The polarization of the sun's light changes with the angle of the rays, hence they can also navigate with cloudy weather There are indications that they can even make corrections depending on the time on a day Diamondback moths are known to fly in a straight trajectory which is not dependent on the angle of the sun's rays Tests have been performed to interfere with the biological clock of certain species by keeping them in the dark and then observing if they would choose for other flight paths The conclusion was that some species did, and others did not Research on monarchs demonstrates that with removal of antennae, the location of the circadian clock, individuals do not localize in any one direction during flight as they do with antennae intact Night flyers cannot use sun light for navigation Most of these species rely on the moon and stars instead

Earth’s magnetic field:A number of moths use the Earth's magnetic field to navigate, as a study of the stray Heart and Dart suggests Another study, this time of the migratory behaviour of the Silver Y, showed that this species, even at high altitudes, can correct its course with changing winds, and prefers flying with favourable winds, which suggests a great sense of direction Aphrissa statira in Panama loses its navigational capacity when exposed to a magnetic field, suggesting it uses the Earth’s magnetic field

Areas where migratory butterflies and moths can be found

Blue Tiger Tirumala limniace butterflies resting while migrating, Western Ghats, South India

Migratory Lepidoptera can be found on all continents, migrating within or from the Tropics and Subtropics North, they can be found up to Spitsbergen, above the Arctic Circle Some migratory Lepidoptera have spread over most of the world Some of these are pest insects, such as the diamondback moth, Helicoverpa armigera, and Trichoplusia ni

Examples of migratory Lepidoptera

Some examples of Migratory Lepidoptera are:

  • In the Indian subcontinent, migrating Lepidoptera are common just before the monsoon season Over 250 species are known to migrate during this period
  • On Madagascar, Chrysiridia rhipheus migrates between populations of four plant species from the Omphalea genus, the host plant of this species The three western Omphalea species live in dry coniferous forests, the eastern species is found in the rainforest and is the only species that is green year round
  • Rhodometra sacraria is normally found in Africa, large parts of Asia and Southern Europe At times, it migrates north and can reach central and northern Europe
  • Vanessa cardui is found all over the world, except South America, on altitudes of up to 3,000 meters above sea level Its home, however, are subtropical steppe areas
  • Several South and Central American species of Uraniidae display a great peak in migratory behavior in certain years In the years with a great number of migrating individuals, there are “population explosions” Individuals migrate to the south and east There is no real re-migration to speak off These moths feed on Omphalea species These can be found in scattered populations all across South and Central America, but only part of the areas where they are found are a permanent habitat for these moths Research suggests that the cause of the migration peak is an increase in toxicity when much of a single plant is eaten and decreasing toxicity when only small amounts of a certain plant are eaten
  • The migration of Euploea core, Euploea sylvester, Tirumala septentrionis, and Tirumala limniace between Western Ghats and Eastern Ghats in India covering up to 350 to 400 km This migration happens twice a year The most probable reasons seem to be the heavy monsoons, reproductive diapause, and a lack of host plants, nectar and alkaloidal resource availability
  • The Australian Painted Lady periodically migrates down the cost of Australia Occasionally, in periods of strong migration in Australia, these butterflies have been known to migrate to New Zealand
  • The Gatekeeper butterfly Pyronia tithonus from Southern and Eastern Britain has been expanding to Northern Britain over the past three decades, despite their preference for warmer conditions

Example species:Macroglossum stellatarum

The green areas are the areas where Macroglossum stellatarum can survive year round In the blue areas it can be found in summer In the yellow area it is found in winter

Macroglossum stellatarum is a moth that is recorded in the subtropical part of the Palearctic ecozone year round In summer, the species disperses north up to Scandinavia and Iceland In winter it migrates further south, deeper into Africa and to the Indian subcontinent

In the Netherlands and Belgium, there are 100 to 200 records per year in an average year In warm summers however, like the years 2005 and 2006, several thousand are recorded In mild winters, small numbers can survive this far north, but these numbers are insufficient to call it a real population

Causes

Usually, butterflies and moths migrate to escape from potentially harmful circumstances Examples of this are a shortage of proper food plants, an unfavorable climate, like cold or extreme rain or overpopulation

Migration and evolution

A phenomenon like migration is an evolutionary development By migrating, the species has survived the process of natural selection There are a number of advantages and disadvantages to migration An example of this is the protozoan Ophryocystis elektroscirrha a parasite of the monarch Severely infected individuals are weak, unable to expand their wings, or unable to eclose, and have shortened lifespans, but parasite levels vary in populations This is not the case in laboratory or commercial rearing, where after a few generations, all individuals can be infected Infection with this parasite creates an effect known as culling whereby migrating monarchs that are infected are less likely to complete the migration This results in overwintering populations with lower parasite loads

Recording

Record of a massive appearance of presumably Agrius convolvuli in 1719 near Turnau

Butterflies and to a lesser extent moths migrating in large numbers are a noteworthy sight, which is easily to observe and track There are several historic records about migrating butterflies There are records dating back to 1100 about migrating butterflies probably a Pieris species from Bavaria to the Duchy of Saxony and from 1248 about the migration of yellow butterflies in Japan

When flying at high altitudes, spotting migrating butterflies or moths can be hard Low flying species are easily spotted or caught using a light trap When individuals fly too high for these methods, air balloons equipped with nets are used at times Alternatively, radar is used to monitor migration

Another registration technique, is marking the wings with tiny stickers, a technique comparable with Bird ringing This technique has not proven to be very successful though Advances in technology might make it possible to equip individuals with micro transmitters in the future

Migration and climate change

Global warming has caused an increase of migratory butterflies and moths that reach north-western European countries like the Netherlands, Belgium and the United Kingdom Research in the United Kingdom confirms that an increasing number of migrants reach the country Because one would expect that migratory species can adapt to new circumstances quite well, the researches warn for new species that can have a negative impact on native species and possible damage to both health species like the Oak Processionary and agriculture

See also

  • Animal migration
  • Butterflies
  • Butterfly house conservatory
  • Conservation biology
  • Monarch butterfly conservation in California
  • Monarch butterfly migration

Footnotes

  1. ^ a b c d Scoble, MJ 1995 "Migration" in The Lepidoptera:form, function and diversity 68-71 Previewed in Google Bookson 09 Oct 2009
  2. ^ a b Meerman, JC 1987 "Dutch Sphingidae" Wet meded KNNV 180
  3. ^ http://dscdiscoverycom/tv-shows/curiosity/topics/10-most-important-insectshtm
  4. ^ Steven M Reppert; Robert J Gegear; Christine Merlin September 2010 "Navigational Mechanisms of Migrating Monarch Butterflies" Trends in Neurosciences 33 9:399–406 doi:101016/jtins201004004 PMC 2929297 PMID 20627420 
  5. ^ a b c J Blab, T Ruckstuhl, T Esche en R Holzberger 1989 Actie voor Vlinders, zo kunnen we ze redden, Weert:M&P
  6. ^ Gibo, DL 1981 "Altitudes attained by migrating monarch butterflies, Danaus p plexipus Lepidoptera:Danaidae, as reported by glider pilots" Canadian Journal of Zoology 59 3:571–572 doi:101139/z81-084 
  7. ^ Mikkola, K 2003 "The Red Admiral butterfly Vanessa atalanta, Lepidoptera:Nymphalidae is a true seasonal migrant:an evolutionary puzzle resolved" PDF European Journal of Entomology 100 4:625–626 doi:1014411/eje2003091 
  8. ^ Drake, VA; Gatehouse, AG 1995 Insect migration:tracking resources through space and time Cambridge University Press p 3 ISBN 978-0-521-44000-4 Retrieved 6 May 2010 
  9. ^ Stefanescu, C; Alarcón, Marta; Àvila, A 2007 "Migration of the painted lady butterfly, Vanessa cardui, to north-eastern Spain is aided by African wind currents" Journal of Animal Ecology 67 5:888–898 doi:101111/j1365-2656200701262x 
  10. ^ a b Chapman, JW; Reynolds, DON R; Smith, AD 2003 "Vertical-Looking Radar, A New Tool for Monitoring High-Altitude Insect Migration" PDF BioScience 53 5:503–511 doi:101641/0006-3568200305320CO;2 
  11. ^ a b Yau I-Chu 1986 "The Migration of Diamondback Moth" in:Diamondback Moth Management, Proceedings of the First International Workshop, Tainan, Taiwan, 11–14 March 1985 Shanhua:The Asian Vegetable Research and Development Center Inhoud
  12. ^ Scott, JA 1992 "Direction Of Spring Migration Of Vanessa cardui Nymphalidae In Colorado" PDF Journal of Research on the Lepidoptera 31 1–2:16–23 Archived from the original PDF on 2006-09-06 
  13. ^ Oliveira, EG; Dudley; Srygley, RB 1996 "Evidence for the use of a solar compass by neotropical migratory butterflies" Bulletin of the Ecological Society of America 775:332 
  14. ^ Merlin, C; Gegear, RJ; Reppert, SM 2009 "Antennal circadian clocks coordinate sun compass orientation in migratory monarch butterflies" PDF Science 325 5948:1700–4 doi:101126/science1176221 PMC 2754321 PMID 19779201 
  15. ^ Baker, RR 1987 "Integrated use of moon and magnetic compasses by the heart-and-dart moth, Agrotis exclamationis" Animal Behaviour 35:94–101 doi:101016/S0003-34728780214-2 
  16. ^ Scientists make compass discovery in migrating moths, University of Greenwich
  17. ^ Srygley, R; Dudley, R; Oliveira, E; Riveros, A 2006 "Experimental evidence for a magnetic sense in Neotropical migrating butterflies Lepidoptera:Pieridae" PDF Animal Behaviour 71:183–191 doi:101016/janbehav200504013 
  18. ^ CB Williams 1930 The Migration of Butterflies Oliver & Boyd:Edinburgh
  19. ^ Senthilmurugan, B 2005 "Mukurthi National Park:A migratory route for butterflies" J Bombay Nat Hist Soc 102 2:241–242 
  20. ^ Smith, N 1991 "Foodplants of the Uraniinae Uraniidae and their Systematic, Evolutionary and Ecological Significance" PDF The Journal of the Lepidopterists' Society 45 4:296–347 
  21. ^ Smith, NG 1983 "Host Plant Toxicity and Migration in the Dayflying Moth Urania" PDF Florida Entomologist 66 1:76–87 doi:102307/3494552 JSTOR 3494552 
  22. ^ a b Dingle, Hugh; Zalucki, Myron P; Rochester, Wayne A 1999 "Season-specific directional movement in migratory Australian Butterflies" Australian Journal of Entomology 38:323–329 doi:101046/j1440-6055199900117x 
  23. ^ Merckx, Thomas; Hans Van Dyck July 2002 "Interrelations Among Habitat Use, Behavior, and Flight-Related Morphology in Two Cooccurring Satyrine Butterflies, Maniola jurtina and Pyronia tithonus" Journal of Insect Behavior 4 15:541–561
  24. ^ Vlindernet Retrieved on 2008-08-26
  25. ^ Leong, K L H; M A Yoshimura; H K Kaya; H Williams 1997 "Instar Susceptibility of the Monarch Butterfly Danaus plexippus to the Neogregarine Parasite, Ophryocystis elektroscirrha" Journal of Invertebrate Pathology 69 1:79–83 doi:101006/jipa19964634 PMID 9028932 Lay summary 
  26. ^ Bartel, Rebecca; Oberhauser, Karen; De Roode, Jacob; Atizer, Sonya February 2011 "Monarch butterfly migration and parasite transmission in eastern North America" Ecology 92 2:342–351 doi:101890/10-04891 PMID 21618914 
  27. ^ Sparks, TH; Dennis, RLH; Croxton, PJ; Cade, M 2007 "Increased migration of Lepidoptera linked to climate change" PDF European Journal of Entomology 104 1:139–143 doi:1014411/eje2007019 

References

  • Bos, F et al 2006 De Dagvlinders van Nederland Nederlandse Fauna, deel 7, Utrecht en Leiden, p 13
  • Drake,VA and Gatehouse,AG 1995, Insect Migration:Tracking Resources Through Space and Time, Cambridge University Press ISBN 0521440009 Google Books
  • Lempke,BJ De Nederlandse Trekvlinders, Zutphen KNNV-Thieme, 1956 Tweede druk in 1972
  • Kuchlein,JH and de Vos,R 1999 Geannoteerde Naamlijst van de Nederlandse Vlinders, Leiden Backhuys

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