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Calopteryx virgo


Calopteryx virgo
Photo Information
Copyright: Roberto Innocenzi (cobra112) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2093 W: 75 N: 6382] (43366)
Genre: Animals
Medium: Color
Date Taken: 2012-09-08
Categories: Insects
Camera: Nikon D300s, Sigma 105mm 1:2.8 EX DG Macro
Photo Version: Original Version
Theme(s): Metallic wonders of nature 2 [view contributor(s)]
Date Submitted: 2012-09-09 0:31
Viewed: 2438
Favorites: 1 [view]
Points: 36
[Note Guidelines] Photographer's Note
Kingdom: Animalia

Phylum: Arthropoda

Class: Insecta

Order: Odonata

Family: Calopterygidae

Genus: Calopteryx

Species: C. virgo


The Beautiful Demoiselle (Calopteryx virgo) is a European damselfly. It is often found among fast-flowing waters. Females lay up to 300 eggs at a time on emergent or floating plants, often on water-crowfoot. Like the Banded Demoiselle, they often submerge to do so. The eggs hatch after around 14 days. Again, like the Banded Demoiselle, the larva is stick-like with long legs and develops over a period of two years in submerged vegetation, plant debris or roots. They usually overwinter in mud or slime. The larvae of the Beautiful Demoiselle develop over 10 to 12 stages, each of which takes place between a molt. The body length is variable and highly dependent on environmental conditions. The final stage (F-0-stage) larvae are 3.5 to 4.6 millimeters and weigh about 4 milligrams, slightly below the Banded Demoiselle. Apart from the larvae of the Demoiselles are difficult to distinguish from each other, the apparent differences lie mainly in the bristles and the severity of the tracheal gills on their abdomen. Compared to other damselflies Demoiselles larvae fall immediately on the other hand, due to their much shorter mean gill lamella. The body of the larvae shows only a relatively small adjustment to the fast-flowing waters of their habitat. The body is not flattened but very slim and turning around, the legs are long and have its end with strong claws, with which it can be stated in the vegetation. Because they reside within the water body, but mainly in the quieter areas, the danger of being swept with the flow, is relatively low. If this happens, they clearly its long body and legs stretched as far as possible to get in touch with the vegetation or the substrate to come. The male usually has much more extensive pigmentation on the wings than other Calopteryx species in its range: in the south east of its range (the Balkans and Turkey) the wings are entirely metallic blue while in other areas, there are clear areas at the base and tip of the wing. Immature insects often have much paler, browner wings. They have metallic blue-green bodies and blue-green eyes. The female has dark brown iridescent wings, a white patch near the tip of the wings (called a pseudopterostigma) and a metallic green body with a bronze tip of the abdomen. The distribution of the Beautiful Demoiselle covers all of Europe with the exception of the southwestern Iberian Peninsula, the Balearic Islands and Iceland. In the north it extends to the Arctic polar sea, and thus much further north than that of the banded demoiselle. On the North African Mediterranean coast, its southern populations in Morocco and Algeria can be found.[1] The northern boundary in Asia following the 13-°C July isotherm , it is therefore not in the areas where the average temperature in summer below 13°C falls, otherwise they are met with in temperate and cool regions in the entire continent with the exception of deserts and the mountains of. The eastern subspecies of C. v. japonica found on the Japanese islands is under debate as to whether it is a separate species. The Beautiful Demoiselle is mostly found in lowland locations. Regular findings come from areas up to a maximum height of 980 m above sea level. Occasionally they may be found up to 1,200 meters in altitude, such as in the Alps. The blue-wing Demoiselle lives mainly on small to medium sized streams and other watercourses. These are characterized by a relatively low water temperature and a moderate to fast flow. The water must not be nutrient rich (eutrophic). In the northern part of their range, such as in Norway and Finland, it is also found in medium-sized rivers or even larger streams. The waters are usually in the immediate vicinity of forests. The larvae live in the aforementioned streams and are mainly due to the vegetation found in the water. The larvae need the stems and leaves, especially in areas with stronger currents in order to hold on. It is on the other hand, it is extremely rare to find them on barren locations, flat expiring banks, or areas with a smooth stone floor. They live in quieter areas between alluvial leaves or on exposed roots of the vegetation. They can be found on submerged plants such as waterweed (Elodea sp.), floods for water crowfoot (Ranunculus fluitans) or other plants. They adhere to a rule in the depths of a few centimeters to several decimeters. Compared with the larvae of the banded demoiselle prefer the larvae of the blue-wing Demoiselle rather quieter areas of the water, since lower flow more effective absorption of oxygen is made possible from the water. Only in very rare cases, however, we find the larvae in stagnant water. The substrate of the river has only a very minor importance, because the larvae reside mainly in the vegetation. An important factor for the occurrence of blue-wing Demoiselles is the oxygen of the water supply. The larvae react with oxygen deficiency is much more sensitive than the larvae of the banded demoiselle, so that the oxygen saturation of the water must be correspondingly high. Waters with high levels of sediment and sludge , which is consumed by bacterial decomposition of oxygen are, accordingly not as a habitat for the larvae. Because of this sensitivity, the other factors of the water chemistry is concerned, the animals as a bioindicator for the assessment of water quality are used. Thus they will be in accordance with DIN an indication of value in the saprobic assigned of 1.9, which represents a low to moderately polluted waters type (β-mesosaprob) and a water quality class from I to II does. Another key factor for the occurrence of the larvae of the blue-wing Demoiselle is the heat balance of the water. This species prefers different from the banded demoiselle, especially the cooler and shadier areas of the water. This is indicated as optimal temperature a summer average 13 to 18 ° C. At temperatures above 22 ° C were often injuries of larvae and observed mainly a reduced hatchability of eggs. The main reason is not, however, the temperature, but the associated reduced capacity of the water for oxygen and the consequent lower oxygen content. Individual populations may, however, used to permanently higher temperatures. The habitat of the adults occupy corresponds to nearby larval habitat. Unlike the adults of the banded demoiselle you meet those of the Deautiful Demoiselle but also in forest clearings, but very rarely on the banks of larger pond. As resting places, the animals need trees and shrubs, but often enough and high herbaceous plants such as stocks of large nettle ( Urtica dioica ) from. The breeding habitats meet the future Larvalhabitaten, these are for cool, shady water-courses largely with a more or less strong current and near-natural vegetation and bank structure. This is mostly meadow and pasture streams in the area, they rarely pass through the forest. A distinct riparian vegetation plays obviously also play a role as a windbreak, because the animals may be due to their broad wings blown away by the wind more easily than other species of dragonflies.

La Calopteryx virgo LINNAEUS, 1758, è un insetto della famiglia Calopterygidae (Odonata: Zygoptera). Gli adulti presentano livree eleganti, con colorazioni metalliche differenti nei due sessi. Il maschio ha ali brune e corpo azzurro metallico, colorazione che si estende anche ad alcune nervature longitudinali. La femmina ha ali brune e corpo bruno-verdastro con riflessi iridescenti. La morfologia è quella tipica degli Zygoptera: il capo è dicoptico e le ali anteriori sono uguali, nella forma e nello sviluppo, a quelle posteriori. In posizione di riposo sono reciprocamente accostate e tenute verticali. Le larve sono provviste di tre lobi respiratori caudali. Come in tutti gli Zygoptera, è un mediocre volatore e l'ovideposizione è endofitica. In Italia sono presenti due sottospecie: Calopteryx virgo padana, presente solo nel Nord Italia, e Calopteryx virgo meridionalis, diffusa in tutto il territorio nazionale.

cloud, maaciejka, ramthakur, Miss_Piggy, marius-secan has marked this note useful
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To Miss_Piggy: I agree.....cobra112 1 09-09 15:15
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Critiques [Translate]

  • Great 
  • cloud Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 497 W: 111 N: 1535] (9539)
  • [2012-09-09 0:59]

Hello Roberto ,
I watch with the pleasure such macro, excellent sharpness and BG.
Regards, Pawel

Hi Roberto,
perfect photo of this dragonfly! Excellent point of view. Perfect sharpness and details. Very good blurred background. Amazing colours.
Congratulations!
Have a nice Sunday,
Maciek

Hi, excellent shot with amazing details and sharpness. Natural colours and simple but good composition. Nice light reflections on the dragonflies "armor".
Have a nice day
Adrian

  • Great 
  • iti Gold Star Critiquer/Gold Note Writer [C: 577 W: 0 N: 650] (7939)
  • [2012-09-09 4:49]

Hi Roberto,
Excellent shot of this dragonfly.
Very nice colours with excellent details.
Good composition and blurred background.
Regards Jiri.

Beautiful Demoiselle is a truly beautiful creature and that too owing to the shape of those intricately designed wings, Roberto.
You have captured it very well from the standard lateral point of view with sharp focus on the entire subject.

*****

Ciao Roberto, gran bella femmina, splendida nitidezza, magnifici colori metallizzati, bravissimo, ciao Silvio

Very nice composition of this gorgeous damselfly

god focus and colors

TFS
J

hello Roberto
this is a very good sharpness picture with nice BG and good light
i like the colours very much
thanks greeting lou

Hello Roberto,
An excellent capture with fine colors, details & sharpness. Well composed & presented with a great POV. TFS & best wishes...MF!

Umar

Great photo Roberto! The composition, the colours, the BG and the sharpness are excellent.
Regards,
Christodoulos

Hallo Roberto
I agree with Pawel : I watch with pleasure such a macro.
I agree with Maciek: Perfect sharpness and details.
I agree with Adrian: Simple but good composition.
I agree with Jiri: Very nice colours and excellent details.
I agree with Ramthakur: Sharp focus on the entire subject.
I agree with Silvio: Bravissimo.
I agree with Jeroen: Gorgeous damselfly.
I agree with Lou: Nice background and good light.
I agree with Umar: Well composed and presented.
I agree with Christodoulos: Great photo Roberto!
I agree with myself that this is a favourite of mine.

Thanks for sharing. Best regards.
Anna

  • Great 
  • PeterZ Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5136 W: 166 N: 13121] (49139)
  • [2012-09-09 12:34]

Hello Roberto,
What a splendid photo and perfection! Superb clarity, fantastic sharpness, beautiful colours with a great blurred background.
Regards,
Peter

  • Great 
  • tuslaw Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2752 W: 280 N: 4931] (19883)
  • [2012-09-09 19:32]

Hello Roberto.
A perfectly composed image of this stunning damselfly. Love the exceptional detail and gorgeous metallic green colors of this little beauty. Truly a top quality photo!!
Ron

Ciao Roberto,
un POV perfetto direi con una qualità fotografica eccellente sia per dettaglio che per la resa dei colori.
Complimenti e bravo per questa macro sapientemente realizzata.

Buona giornata
davide

  • Great 
  • anel Gold Star Critiquer/Gold Note Writer [C: 3052 W: 3 N: 8715] (40572)
  • [2012-09-10 0:29]

Bonjour Roberto,
Voilà donc à nouveau la saison de ces splendeurs..qui malheureusement ne vivent pas dans mon environnement.
Image de grande beauté, toute en vert, et présentée avec une netteté parfaite.
Bien vu, encore!
Bonne semaine
Anne

  • Great 
  • Cobo Gold Star Critiquer/Gold Note Writer [C: 229 W: 1 N: 530] (5755)
  • [2012-09-10 3:32]

Excellent presentation Roberto! Congratulation. Un saludo.

Hello Roberto,
Again an amazing capture with splendid natural colors and nice details. The light and exposure are great. Excellent capture of a very nice damselfly. Incredible sharp details and lovely metallic colors.
Thanks for sharing!
Marius.

  • Great 
  • lousat Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 6421 W: 89 N: 15570] (65152)
  • [2012-09-23 14:30]

Questa invece e' roba di casa nostra,una delle piu' difficili da fotografare,un po' come il Rubi,cambiano colore e riflessi a seconda della luce.Ogni soluzione e' valida e la tua mi sembra davvero eccellente! Luciano

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