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Hyla arborea (Linnaeus, 1758)


Hyla arborea (Linnaeus, 1758)
Photo Information
Copyright: Ena Simic (Ena) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 324 W: 61 N: 594] (2454)
Genre: Animals
Medium: Color
Date Taken: 2006-08-07
Categories: Amphibians
Exposure: f/3.0, 1/60 seconds
Details: (Fill) Flash: Yes
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2007-10-07 12:17
Viewed: 5415
Favorites: 2 [view]
Points: 34
[Note Guidelines] Photographer's Note
Hyla arborea (Linnaeus, 1758)
The European tree frog is a small frog that can grow to 4,5 cm in size at most. Historically, tree frogs were used as barometers because they respond to approaching rain by croaking. In the breeding season, even when migrating to their mating pools, they croak as well. Depending on subspecies, temperature, humidity, and the frog's 'mood', skin color ranges from bright to olive green, grey, brown and yellow. The head is rounded, the lip drops strongly, the pupil has the shape of a horizontal ellipse and the eardrum is clearly recognizable.

Males can be distinguished from females by their browny-yellowy, large (folded) vocal sacs in the throat region. The amplexus is axillary (in the armpits). Both adult males and females reach sizes up to 30-40 mm, rarily longer than 45 mm. The smooth, shining, usually leaf-green back and the white-yellowish to grey belly are separated by a dark stripe on its flank reaching from the nostrils, over the eye and the eardrum, to the groin, contrasting the green, and forming a dark spot near the hips. The hind legs are much larger and stronger than the fore legs, which enables to jump rapidly.

Calls
Some frog species look so identical the frogs cannot discern the difference between their species and a different species. To overcome this difficulty, each frog species has a specific call that the male innately knows and performs. Thus, the females can recognize their specific species’ mating call and respond to it by following the call. It is always impressive, that such a small froglet have this very loud voice. They are the loudest frogs of Europe, because of their large larynx (about one-fifth of the body length). The croaking sounds like a strong rithmic 'creck-creck-creck-creck...' and resemble the call of the Baillon's Crake (Porzana pusilla) and the Little Crake (Porzana parva). In late afternoon or dusk, H. arborea starts to call sometimes throughout the night. Calling and breeding activity probably begins in warm nights at late April. The call of H. arborea is very characteristic and easy identifable, so this fact helps to determinate these frogs in their natural habitats.


Mating
Between the months of April and August, Squirrel Treefrogs of at least one year old begin to mate, Tree frogs find their mate through croaking and quivering. Once the male and female find each other, amplexus, the term for the embrace between the male and the female begins. The male, because of its smaller size, goes on top of the female. Fertilization is external, with the female’s eggs laid during amplexus. Next, the male sheds sperm over the up to 1000 usually individually deposited eggs and fertilization transpires. Females usually lay eggs twice a mating season.


Spawn
Eggs are deposited mostly during May, with the earliest spawn observed at the end of March. The clusters of spawn (each consisting of 10 to 50 eggs) are as big as walnuts and are deposited in shallow places grown with water plants. The top of every egg is brown and the bottom yellowy white. The diameter of an egg lies between 1.5 to 2 millimeter. After the deposition the eggs come together in clusters in order that the animal pole, which is pigmented brown and yellow, points upward and the vegetative pole, which is white and unpigmented, points downward.

The time of development of the clutches depends on the prevailing water temperatures. Clusters that sink to the bottom of the water develop considerably slower than those which are exposed to the sunlight directly under the surface of the water.


Distribution
Widely distributed throughout Europe from the Ukraine and Belarus to the Balkans, Crete, Italy, the Benelux, Germany, most of France and the northwestern Iberian peninsula. Absent in the British Isles, the majority of Scandinavia and Denmark, the Alps and small northern parts of the Netherlands and Germany.
Kingdom: Animalia

Phylum: Chordata
Class: Amphibia
Order: Anura
Family: Hylidae
Genus: Hyla
Species: H. arborea


Wikipedia

nardophoto, dejo, flashpoint, undoredo, cataclysta, ocskaymarci, Pier, juhi, TiberiuSahly, oanaotilia has marked this note useful
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Critiques [Translate]

Hola Ena. Bienvenido a TN.
Buenos detalles y preciosos colores.
Un saludo, JL.

Hes just hanging out, hes really cute. Welcome to TN

  • Great 
  • dejo Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 344 W: 51 N: 520] (2242)
  • [2007-10-08 12:16]

interesantna kompozicija slike, svidja mi se!
dobra boja, ostrina, dubina, odlicno uradjeno :)

Ciao Ena,
good composition and excellent POV. Beautifull colors.
TFS
Angelo

  • Great 
  • Alma Silver Star Critiquer [C: 13 W: 0 N: 1] (8)
  • [2007-10-15 7:52]

Bellissimo soggetto! I colori sono belli e nitidi!

Molto simpatica questa foto. Colori bellissimi e posa incantevole.

Ciao e grazie, Emanuele

Bonjoue Ena

Trés jolie photo de cette grenouille équilibriste.

Liliane

Hello Ena,
Great frog, good sharpness, lovely colours.
Bye
Marc

ciao Ena
fantastic pose of this hyla arborea
well focused and great details
good note

best regards sERGIO

Hi Ena! I've been looking your photos. I'm posting my comment on this, just 'cause this is great! I wanna say, all your pictures are wonderful, but i don't know why, I choose this one. Keep your eyes and heart on the camera.
Best regards, Gastón.

Hello Ena,
Very cute little frog you've captured.
I love this shot very much.
Excellent focusing and details here.
Well presented with nice composition.
TFS and regards,
Kevin

Excelent picture.Congratulations!

merhaba Ena,
this is your first shot on TN. But I have just seen it. This is very nice shot in beautiful composition and coloration. Nice focus, POV. Interesting place for roosting. TFS, well done
Ahmet

Hi Ena
Very funny and good technically photo of Hyla. Good sharpness and nice OOF background. Also very informative note
Best wishes
Krzysztof

Hi Ena!
Great photo! The composition and the sharpness are fantastic as well as the DOF and the colours.
TFS!
Cheers,
Marci

  • Great 
  • sily Gold Star Critiquer/Gold Note Writer [C: 239 W: 6 N: 395] (1934)
  • [2007-12-08 17:05]

Pozdrav Ena,
prelepa slika moje omiljene zabice!

  • Great 
  • Pier Silver Star Critiquer/Silver Note Writer [C: 25 W: 0 N: 37] (808)
  • [2007-12-24 11:05]

Una specie molto interessante cosi' verde non ne avevo mai viste e non sapevo neppure che vivessero dalle nostre parti, cerchero' se mi capita di scovarne qualcuna ma credo che perlomeno dalle mie parti(Centro Italia) sia una specie rarissima.
Un saluto e approfitto per contraccambiare gli auguri per un sereno e felice Natale a te e ai tuoi cari.
Piero

Uh, dobra fotografija gatalinke, dobra ideja i realizacija

Oh my God! This picture is splendid! And so is the animal, superb colours! I love it! Making it a favourite! THANK YOU for sharing!
Regards, Tibi!

  • Great 
  • foozi Gold Star Critiquer/Gold Note Writer [C: 2791 W: 0 N: 6696] (25839)
  • [2008-12-24 3:04]

Hi Ena,
a lovely pose in its greatstance of about to jump. A very sharp and clear shot of the frog. The superbs green against the blurry background is indeed very pleasant.
Excellent composition.

Regards,
Foozi

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