Biology:Dainty damselfly

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Short description: Species of damselfly

Dainty damselfly
Coenagrion scitulum (50849317743).jpg
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Odonata
Suborder: Zygoptera
Family: Coenagrionidae
Genus: Coenagrion
Species:
C. scitulum
Binomial name
Coenagrion scitulum
(Rambur, 1842)
Male dainty damselfly

The dainty damselfly (Coenagrion scitulum), also known as the dainty bluet, is a blue damselfly of the family Coenagrionidae. This is a scarce species found mainly in southern Europe, northern Africa, southwest Asia, and Central America. C. scitulum are Odonata (dragonflies & damselflies) predators that can reach a length of 30–33 mm at maturity and have hind-wing lengths of 15–20 mm.[2] The males and females do exhibit differing features through their colouration making them easily distinguishable. As shown in the photo to the left, segment eight is blue in colour followed by black markings on segment nine, whereas the females are mostly black near the rear with smaller blue markings.[3] Although they are relatively simple to sex, they are easily confused with the common blue damselfly.[3]

Habitat

C. scitulum are found in large and generally stagnant,[4] ponds with abundant vegetation including water-milfoil and hornwort, they can also be found in flooded ditches.[2] It has also been discovered that constructed wetlands are an important habitat and sanctuary for C. scitulum. This is because these areas lack fish that prey on insects giving the dainty damselfly a safe habitat to live and reproduce in.[5] They are most easily spotted during the months of June and July and males can be most easily observed perched on floating vegetation in open water.[2] Although dainty damselflies are quite small they do have the ability to travel distances between ponds if resources become sparse and if the benefits outweighs the cost.[6] We also see evidence of their movement through the recolonization of the lost population in United Kingdom .

Reproduction

C. scitulum exhibits unique mating habits compared to other Odonates. In damselfly reproduction there is indirect insemination. The male damselfly will pass their sperm from the testes to the penis in order for the female to obtain it from them.[7] This translocation of sperm only happens once in all other species of damselflies. In C. scitulum this process happens upwards to six times during the copulation cycle.[7] There are a few hypotheses as to why this process may occur, one of them being that several sperm translocations may be needed to achieve full insemination.[7] After this process is done and the female has successfully fertilized her eggs, she then lays them. The male is usually still attached to the female at this point to stop other males from removing their sperm, although sperm removal is harder in C. scitulum as they do not have the spines on the horns of their penis as other damselflies do. The dainty damselfly seems to be univoltine in their core populations and in their expansion populations, this was exhibited when ponds were sampled and they showed that each was a separate population.[8]

Conservation status

Male C. scitulum

The dainty damselfly was formerly recorded as a breeding species in Britain and had thought to have become locally extinct after the North Sea flood of 1953.[9][10] There was a large viable population in East Anglia, but after the flood many seasons passed by without any sightings of the dainty damselfly leading to the conclusion that they had been extirpated. In 2010, after 57 years without sightings, it had been positively identified and rediscovered in Kent.[9][10][11] This meant that there had to have been a viable population all along, it just had diminished to critical numbers. The dainty damselfly is able to disperse quite widely so it is a possibility that a neighbouring population made its way back into the area.

The current status of C. scitulum according to IUCN Red List is of 'Least Concern', meaning that the population is considered stable according to the IUCN's criteria.[1]

Distribution and geographic movement

Distribution

The dainty damselfly is mostly found in western Europe, northwest Africa, western Caspian and the south Caucasus regions.[1] It can also be found in Eastern Europe. There seems to be another population of C. scitulum in central Asia and it's not clear if this is a separate species or if they traveled from the European population across the mountains of Afghanistan and northern Iran.[1]

Geographic movement

Male C. scitulum

There are many factors contributing to the geographic movement of C. scitulum some of these include changing temperatures, land disruption and decreasing water levels. The number one cause of dispersal in dainty damselflies is rising temperatures as they tract their optimal thermal niche to new locations.[12] In the 1990s the most northern edge of their range was located in northern France.[8] Due to climate change though there has been an increased poleward distribution, and now the dainty damselfly's populations have expanded from historical ranges and has founded edge populations in a northward, eastward and westward direction.[8][13][14]

This poleward expansion has been associated with rapid phenotypic change and founder effects including reduction in genetic diversity and increases in genetic differentiation.[8][15] It has been found that the new edge populations are genetically differentiated from the core populations and all of the new populations were differentiated from each other giving indication that each range expansion is independent.[15] There are some issues with the changes in genetic diversity though. There has been studies completed on the dainty damselfly showing that genetic diversity can influence the success of colonization and can decrease resistance to stress and disease.[8] This can make the insect more susceptible to toxins such as pesticides which in turn also affects the dainty damselflies' ability to continue their dispersal through slow movement, reduced population growth and flight ability.[12] The dainty damselflies are being exposed to pesticides more frequently due to their dispersal and need to cross agricultural land to reach new habitats. It's not just dispersal due to climate change that causes the genetic changes in the dainty damselfly though, it can also happen due to natural range expansion as well.[8] The genetic diversity and structure of dainty damselflies are shaped by both historical rapid range expansions and contemporary processes causing dispersal like environmental factors (climate change).[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 Boudot, J.-P. (2014). "Coenagrion scitulum". IUCN Red List of Threatened Species 2014: e.T165502A19159139. doi:10.2305/IUCN.UK.2014-1.RLTS.T165502A19159139.en. https://www.iucnredlist.org/species/165502/19159139. Retrieved 11 November 2021. 
  2. ↑ 2.0 2.1 2.2 Smallshire, David; Swash, Andy (2014). Britain's Dragonflies: A Field Guide to the Damselflies and Dragonflies of Britain and Ireland : A Field Guide to the Damselflies and Dragonflies of Britain and Ireland. pp. 84. 
  3. ↑ 3.0 3.1 "Dainty Damselfly | british-dragonflies.org.uk". http://www.british-dragonflies.org.uk/species/dainty-damselfly. 
  4. ↑ Dragonflypix.com. "Dainty Bluet: 20 Photos". http://www.dragonflypix.com/speciespages_en/coenagrion_scitulum.html. 
  5. ↑ Gallardo, Belinda; García, Mercedes; Cabezas, Álvaro; González, Eduardo; González, María; Ciancarelli, Cecilia; Comín, Francisco A. (2008-07-01). "Macroinvertebrate patterns along environmental gradients and hydrological connectivity within a regulated river-floodplain" (in en). Aquatic Sciences 70 (3): 248–258. doi:10.1007/s00027-008-8024-2. ISSN 1015-1621. 
  6. ↑ Angelibert, S; Giani, N (2003). "Dispersal characteristics of three odonate species in a patchy habitat". Ecography 26: 13–20. doi:10.1034/j.1600-0587.2003.03372.x. 
  7. ↑ 7.0 7.1 7.2 CORDERO, ADOLFO; SANTOLAMAZZA-CARBONE, SERENA; UTZERI, CARLO (1995-02-01). "Male disturbance, repeated insemination and sperm competition in the damselfly Coenagrion scitulum (Zygoptera: Coenagrionidae)". Animal Behaviour 49 (2): 437–449. doi:10.1006/anbe.1995.0057. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Swaegers, Janne; Mergeay, Joachim; St-Martin, Audrey; De Knijf, Geert; Larmuseau, Maarten H. D.; Stoks, Robby (2015-08-01). "Genetic signature of the colonisation dynamics along a coastal expansion front in the damselfly Coenagrion scitulum" (in en). Ecological Entomology 40 (4): 353–361. doi:10.1111/een.12189. ISSN 1365-2311. 
  9. ↑ 9.0 9.1 "Coenagrion scitulum". British Dragonfly Society. http://british-dragonflies.org.uk/species/dainty-damselfly. 
  10. ↑ 10.0 10.1 Ettinger, P.. "Wildlife Extra News - Absent damselfly re-discovered in Britain after 57 years". http://www.wildlifeextra.com/go/news/dainty-damselfly.html#cr. 
  11. ↑ Richard, Black (21 July 2010). "Beautiful 'lost' insect turns up anew in UK". BBC News. https://www.bbc.co.uk/news/science-environment-10718550. 
  12. ↑ 12.0 12.1 Dinh, Khuong Van; Janssens, Lizanne; Therry, Lieven; Gyulavári, Hajnalka A.; Bervoets, Lieven; Stoks, Robby (2016-03-01). "Rapid evolution of increased vulnerability to an insecticide at the expansion front in a poleward-moving damselfly" (in en). Evolutionary Applications 9 (3): 450–461. doi:10.1111/eva.12347. ISSN 1752-4571. PMID 26989436. 
  13. ↑ 13.0 13.1 Swaegers, J.; Mergeay, J.; Therry, L.; Bonte, D.; Larmuseau, M. H. D.; Stoks, R. (2014-04-01). "Unravelling the effects of contemporary and historical range expansion on the distribution of genetic diversity in the damselfly Coenagrion scitulum" (in en). Journal of Evolutionary Biology 27 (4): 748–759. doi:10.1111/jeb.12347. ISSN 1420-9101. PMID 24581303. 
  14. ↑ Swaegers, J.; Mergeay, J.; Therry, L.; Larmuseau, M. H. D.; Bonte, D.; Stoks, R. (2013-11-01). "Rapid range expansion increases genetic differentiation while causing limited reduction in genetic diversity in a damselfly" (in en). Heredity 111 (5): 422–429. doi:10.1038/hdy.2013.64. ISSN 0018-067X. PMID 23820582. 
  15. ↑ 15.0 15.1 Swaegers, J.; Mergeay, J.; Van Geystelen, A.; Therry, L.; Larmuseau, M. H. D.; Stoks, R. (2015-12-01). "Neutral and adaptive genomic signatures of rapid poleward range expansion" (in en). Molecular Ecology 24 (24): 6163–6176. doi:10.1111/mec.13462. ISSN 1365-294X. PMID 26561985. 

External links

YouTube video

Wikidata ☰ Q442936 entry



  1. ↑ "Dainty Bluet – Coenagrion scitulum –". http://dragonflyphotofavourites.co.uk/dainty-bluet-coenagrion-scitulum/. 
  2. ↑ Paul Hopkins (2011-06-20), Dainty Damselfly, https://www.youtube.com/watch?v=Irm5St96JdI, retrieved 2016-11-23 
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