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Under sentence of death


Under sentence of death
Photo Information
Copyright: Helmut Roos (buscape) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 355 W: 20 N: 1518] (7615)
Genre: Animals
Medium: Color
Date Taken: 2012-07-08
Categories: Amphibians
Camera: Nikon D 800E, AF-S Micro Nikkor 105mm 1:2.8G VR, Nikon TC14EII
Exposure: f/4.2, 1/200 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2012-07-24 1:38
Viewed: 2471
Points: 34
[Note Guidelines] Photographer's Note
English:

I have found this Common Toad sitting in a puddle. While looking at the picture I have realized that it is fallen ill with the larvae of the toadfly, what means it is under sentence of death.

Parasitism:
The adult toadfly lays its eggs on the skin at the entrance to the nostrils of the common toad although it has been known to infest other frog and toad species. It often preferentially chooses sick or injured individuals. On hatching, the larvae start to feed on the tissue of the nostrils and work their way into the nasal cavities. The larvae grow rapidly and as their appetite increases, they start to consume the eyes, the brain and other tissues of the host. Alternatively, the eggs may be laid in wounds and eat the hosts flesh. When the toad has died and the larvae have totally consumed its tissues and finished their development, they make their way into the soil and pupate. The larvae are sensitive to temperature and only thrive between 14°C and 29°C. If they are cooled below this range they will stop feeding and attempt to leave the host and bury themselves shallowly in the soil to hibernate. In a study in the Netherlands, it was found that the fly selectively targeted larger toads with no juveniles and very few one year-olds being affected. Overall, 8% of the toads examined were hosts to the toadfly larvae and would later have died, resulting in the activities of this parasite having a significant effect on the toad population.

Source: Wikipedia

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Deutsch:

Ich habe diese Erdkröte in einer Pfütze sitzend gefunden. Während der Betrachtung der Bilder ist mir dann aufgefellen, dass sie mit der Krötenfliegelarve befallen und damit zum Tode verurteilt ist.

Lebensweise der Krötengoldfliege:
Krötengoldfliegen leben vor allem in blütenreichen Staudenfluren, insbesondere an Doldenblütlern, und ernähren sich dort von Pollen und Nektar. Zur Fortpflanzung platzieren die Tiere in den Sommermonaten ihre weißen, länglichen Eier auf den Rücken oder Kopf von Kröten und anderen Amphibien. Betroffen ist insbesondere die Erdkröte; darüber hinaus sind aber auch Kreuzkröte, Wechselkröte, Grasfrosch, Geburtshelferkröte, Knoblauchkröte, Laubfrosch, Moorfrosch, Teichfrosch und ausnahmsweise der Feuersalamander als Wirtsarten belegt. Die rasch schlüpfenden Larven dringen durch die Nasenlöcher in den Kopf des Wirtes ein, wo sie sich durch das Weichgewebe des noch lebenden Tieres fressen. Nach wenigen Tagen kann der vordere Schnauzen- und Kopfbereich völlig deformiert und entstellt sein. Wenn die Larven dabei das Gehirn erreicht haben oder andere lebenswichtige Organe oder Körperfunktionen zerstört wurden, verendet der Lurch schließlich. In ihrem letzten Larvenstadium haben die Maden den Kadaver mitunter fast vollständig aufgefressen – einschließlich Haut und Bindegewebe, unter Umständen sogar samt Knorpel und Knochen. Dann graben sie sich in anstehenden feuchten Boden ein und verpuppen sich. Der gesamte Vorgang vom Schlupf der Fliegenmaden aus den Eiern über das Eindringen in den Wirt, die Larvenentwicklung in dessen Körper, sein Verenden und bis zum Verpuppen der Larven dauert etwa drei bis vier Wochen. Eine tote Kröte kann innerhalb von ein bis zwei Wochen (je nach Befallsdichte) vollständig skelettiert worden sein. Zu berücksichtigen ist dabei, dass es oft anscheinend auch noch zu sekundärem Befall des Kadavers mit Larven anderer Fliegenarten kommt. Das Puppenstadium bis zum Schlupf fertiger Goldfliegen der nächsten Generation dauert weitere ungefähr ein bis drei Wochen.

Quelle: Wikipedia

josediogo1958, KOMSIS, samiran88, Ilducabianco, IronM, cloud, maaciejka, anel has marked this note useful
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ThreadThread Starter Messages Updated
To anel: Krötengoldfliegenlarvenbuscape 1 07-25 05:32
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Critiques [Translate]

Bom dia Helmut
Great document and wonderful capture.Superb low POV and composition,wonderful soft colours and excellent sharpness.Congrats!
Thank You
Have a good week!
Berst regards
J.Diogo

  • Great 
  • KOMSIS Gold Star Critiquer/Gold Note Writer [C: 820 W: 0 N: 2419] (10674)
  • [2012-07-24 2:34]

Hallo Helmut,
Very nice presentation of a documentary ..
Focus and selection of depth of field is very nice.
Best wishes,
Seyfi

Ciao Helmut, great capture of poor common toad, fantastic reflections, splendid clarity. wonderful light and colors, very well done, my friend, ciao Silvio

Hi Helmut,
Great POV and composition. The subject is crisp and clear and the DOF is perfect, same poor frog
TFS,

Regards
Patrick

Hell Helmut,
what a nice angle to take a portrait of a toed. he/she looks majestic because of the PoV.
nice sharpness and perfect colour.
best wishes,
samiran

Hi Helmut,

an image full of meaning, to be mirrored in the element water (symbol of life) in spite of the deadly parasite.Reasoning more for would-be poets than for nature photographer.However the picture is truly remarkable, besides the technical aspect, for that inherently artistic or figurative.Excellent POV and composition.

TFS

Alessio

  • Great 
  • lousat Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 6595 W: 89 N: 15659] (65489)
  • [2012-07-24 7:44]

Hi Helmut.Magnificent choice of point of view to take this beautiful reflection of the frog in the water,a very original pic but a terrible moment whit the last day of him.Excellent details,sharpness and colors.Have a nice evening and thanks,Luciano

  • Great 
  • IronM Gold Star Critiquer/Gold Note Writer [C: 144 W: 3 N: 345] (2608)
  • [2012-07-24 8:06]

Hi Helmut,
well that is nature too , what to say. Thanks for this presentation I had no idea that toad could get ill that way !

O HELMUT; MY FAVORITE TODAY!Never thought i would say this; GORGEOUS TOAD!

  • Great 
  • cloud Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 497 W: 111 N: 1535] (9539)
  • [2012-07-24 10:26]

Hello Helmut,
It's wonderful composition with perfectly chosen low POV. There is calm and dampness.
Regards, Pawel

  • Great 
  • siggi Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3097 W: 109 N: 12399] (52850)
  • [2012-07-24 10:36]

Hello Helmut,
Interesting pov at this face to face picture. Great color tone for this particular pose. Very well done.Best regards Siggi

hello Helmut
hreat picture with nice BG and great sharpness
i like this composition very much
When i saw this picture i see the place from the toadfly \
after see the picture i see you wrote of this fly
Also in Holland there are many dead

thanks greeting lou

great low angle, TFS Ori

Hi Helmut,
excellent photo of this frog. Perfect point of view. Interesting pose. Great composition.
Thanks for sharing,
Maciek

  • Great 
  • iti Gold Star Critiquer/Gold Note Writer [C: 577 W: 0 N: 650] (7939)
  • [2012-07-24 12:34]

Hi Helmut,
Nice shot, lovely natural colours.Very nice reflection the the frog in the water.
Regards Jiri.

  • Great 
  • PeterZ Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5137 W: 166 N: 13121] (49139)
  • [2012-07-24 12:43]

Hello Helmut,
Impressive photo of this toad taken from the best POV in a fantastic atmosphere. Beautiful colours in good sharpness. And this all in spite of the toadfly.
Regards,
Peter

Sad story but GREAT photo Helmut! Very good low POV, excellent composition, fantastic soft lighting and very good sharpness!
Regards,
Christodoulos

  • Great 
  • anel Gold Star Critiquer/Gold Note Writer [C: 3053 W: 3 N: 8715] (40574)
  • [2012-07-25 5:20]
  • [+]

Lieber Helmut,
Ein wunderschönes Bild mit diesen Pastellfarben. Beste Bildgestaltung auch.
Ein Bild, das ich auch gerne selber gemacht hätte! Wie kann man sehen, dass dieses Exemplar von der Krötenfliegenlarve befallen ist?
Herzlich grüsst
Anne

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