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small white


small white
Photo Information
Copyright: Jacqueline Schnepp (Noisette) Gold Star Critiquer/Gold Note Writer [C: 1714 W: 4 N: 2351] (7821)
Genre: Animals
Medium: Color
Date Taken: 2015-06-24
Categories: Insects
Exposure: f/5.6, 1/320 seconds
More Photo Info: [view]
Photo Version: Original Version, Workshop
Date Submitted: 2015-11-28 16:46
Viewed: 2029
Points: 16
[Note Guidelines] Photographer's Note
hello all

a remember from the warm days, now we have winter time

Pieris rapae
From Wikipedia, the free encyclopedia

The small white (Pieris rapae) is a small- to medium-sized butterfly species of the whites-and-yellows family Pieridae. It is also known as the small cabbage white and in New Zealand, simply as white butterfly. The names "cabbage butterfly" and "cabbage white" can also refer to the large white. The butterfly can be distinguished by the white color with small black dots on its wings. They are distinguished from the smaller size and lack of the black band at the tip of their forewings.
It is widespread and populations are found across Europe, North Africa, Asia, and Great Britain. It has also been accidentally introduced to North America, Australia and New Zealand. The caterpillar of this species is seen as a pest for commercial agriculture. Often referred to as the "imported cabbageworm" they are a serious pest to cabbage and other mustard family crops.

Description

In appearance it looks like a smaller version of the large white (Pieris brassicae). The upperside is creamy white with black tips on the forewings. Females also have two black spots in the center of the forewings. Its underwings are yellowish with black speckles. It is sometimes mistaken for a moth due to its plain appearance. The wingspan of adults is roughly 32–47 mm (1.25–2 in).

Distribution and habitat

The species has a natural range across Europe, Asia, and North Africa. It was accidentally introduced to Quebec, Canada around 1860 and spread rapidly throughout North America. The species has spread to all of North American life zones from Lower Austral/Lower Sonoran to Canada. Estimates show that a single female of this species might be the progenitor in a few generations of millions. It is absent or scarce in desert and semidesert regions (except for irrigated areas). It is not found north of Canadian life zone, nor on Channel Islands off the coast of southern California. By 1898, the small white had spread to Hawaii; by 1929, it had reached New Zealand and the area around Melbourne, Australia and found its way to Perth as early as 1943.
In Britain, it has two flight periods, April–May and July–August, but is continuously-brooded in North America, being one of the first butterflies to emerge from the chrysalis in the spring and flying until hard freeze in the fall.
The species can be found in any open area with diverse plant association. It can be seen usually in towns, but also in natural habitats, mostly in valley bottoms. Although an affinity towards open areas is shown, the small white is found to have entered even small forest clearings in recent years.
The nominate subspecies P. r. rapae is found in Europe, while Asian populations are placed in the subspecies P. r. crucivora. Other subspecies include atomaria, eumorpha, leucosoma, mauretanica, napi, novangliae, and orientalis.

Life cycle

The small white will readily lay eggs on both cultivated and wild members of the cabbage family, such as Charlock (Sinapis arvensis) and Hedge mustard (Sisymbrium officinale). P. rapae is known to lay eggs singly on the host plant. The egg is characterized by a yellowish color and 12 longitudinal ridges.[10] The egg production peaks about a week after adulthood in lab and the female can live up to 3 weeks. Females tend to lay fewer eggs on plants in clumps than on isolated plants.[5] It has been suggested that isothiocyanate compounds in the family Brassicaceae may have been evolved to reduce herbivory by caterpillars of the small white.[11] However, this suggestion is not generally accepted because the small white has later been shown to be immune to the isothiocyanate forming reaction due to a specific biochemical adaptation. In contrast, the small white and relatives seem to have evolved as a consequence of this biochemical adaptation to the isothiocyanate-forming glucosinolates.
Traditionally known in the United States as the imported cabbage worm, now more commonly the cabbage white, the caterpillars are bluish-green, with tiny black pints, a black ring around the spiracles, and a lateral row of yellow dashes, and a yellow middorsal line.[4] Caterpillars rest on the undersides of the leaves, making them less visible to predators. Although the larval instars have not been fully studied, different instars are easily differentiated simply by comparing sizes, especially the head alone. During the first and second instar the head is entirely black; third instar has the clypeus yellow but the rest of the head black. In the fourth and fifth instar, there is a dark greenish-yellow dot behind each eye but with rest of the head black. However, the color of the caterpillar head does not necessarily indicate specific instar, as the time of color change is not fixed.[10] In the larval stage, the small white can be a pest on cultivated cabbages, kale, radish, broccoli, and horseradish. The larva is considered a serious pest for commercial growth of cabbage and other Brassicaceae.
The pupa of P. rapae is very close to that of P. napi. It is brown to mottled-gray or yellowish, matching the background color. It has a large head cone, with a vertical abdomen and flared subdorsal ridge. The two (pupa of P. rapae and P. napi) can be easily distinguished by comparing the proboscis sheath. In P. rapae, the proboscis sheath extends far beyond the antennal sheath while in P. napi, only a very short distance.
Like its close relative the large white, the small white is a strong flyer and the British population is increased by continental immigrants in most years. Adults are diurnal and fly throughout the day, except for early morning and evening. Although there is occasional activity during the later part of the night, it ceases as dawn breaks.[13] Adult P. rapae can move many kilometers in individual flights. Adults have been observed to fly as much as 12 km in one flight.[9] On average, a female flies about 0.7 km per day and moves 0.45 km from where she starts. Males patrol all day around host plants to mate with females.

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To lousat: Hello LucianoNoisette 1 12-01 17:24
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Critiques [Translate]

Hello Jacqueline,
You have done a nice job displaying this Small white in an attractive composition. The focus appears sharp on the butterfly and the clean BG is an added bonus. I do however think the exposure is a tad high and hides some of it's subtle wing color as well as detail. Hope you don't mind, but I wanted to try a WS.
Ron

Ciao Jacqueline, great macro of lovely butterfly on beautiful flower, wonderful natural colors, splendid sharpness and fine details, very well done my friend, have a good Sunday, ciao Silvio

Hi Jacqueline,
A good capture with excellent POV.I also garee with Ron,that the exposure is a tad high with the flowers a bit OF.Any how a good effort.
TFS
navnith

  • Great 
  • PeterZ Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5137 W: 166 N: 13121] (49139)
  • [2015-11-29 1:01]

Hello Jacqueline,
With a bit more of adding contrast you should have come closer to a better presentation. But it is still a nice one. Good sharpness and an excellent composition with a good blurred background.
Regards,
Peter

Bonjour Jacqueline,
I more or less agree with Ron about the overexposure, however, the composition's spectacular.
Kind regards, László

  • Great 
  • siggi Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3097 W: 109 N: 12399] (52850)
  • [2015-11-29 11:02]

Hello Jacqueline,
Beautiful capture and well done on the composition and details. Excellent work.
Regards Sigi

Excellent work Jacqueline.
Well done.

Thanks for sharing.
gr.Yves

Hello Jacqueline,

"Distribution and habitat" part is really interesting how they spread!
Excellent BG if we look its color. Composition is also nice too. But the light on wing looks nit perfect.
Thanks for such long and informative BITE,
Regards,
Srikumar

Salut Jacqueline,seulement un peu surexposee' mais pas des problemes,les details sont excellents et les couleurs tres naturelles,un joli souvenir de la saison qui est terminee..belle soiree' et bonne nuit,Luciano

  • Great 
  • KOMSIS Gold Star Critiquer/Gold Note Writer [C: 820 W: 0 N: 2419] (10674)
  • [2015-12-04 9:42]

Salut Jacqueline,
Great shot of this Pieris rapae ..
Excellent colours and nice detail with very nice back ground.
Best wishes,
Seyfi

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