Ryukyu Kajika frog – Amphibians of the Ryukyu Islands

The Ryukyu Kajika frog (  Buergeria japonica ) is found throughout the Ryukyu Islands. It is the most common frog found on Okinawa.

  • Scientific name: Buergeria japonica
  • Common name: Ryukyu Kajika frog
  • Distribution: Ryukyu Islands
  • Habitat: Forests, mountain slopes, drainage ditches and farm fields.
  • Diet: Small Insects
  • Average size: 25mm-40mm
  • Color: Olive green, brown and golden yellow

This small frog is a master of camouflage. I often find it on rocks, plants, trees, drainage ditches and even our trash.

Ryukyu Kajika frog on tatami mat

Ryukyu Kajika frog on tatami mat

Ryukyu Kajika frog

Ryukyu Kajika frog -macro

Ryukyu Kajika frog

Ryukyu Kajika frog – blending in

Ryukyu Kajika frog

Ryukyu Kajika frog

Ryukyu Kajika frog

Ryukyu Kajika frog- man hole cover

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Ryukyu Kajika frog- skin discoloration

Kajika frog -Iriomote Island

Kajika frog -Iriomote Island

Photographed on white for the Meet Your Neighbours Project

Ryukyu Kajika frog - MYN

Ryukyu Kajika frog – MYN

The males turn a golden yellow during mating season. The season stretches from April to September on Okinawa.

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Ryukyu Kajika frog – mating

Ryukyu Kajika frog

Ryukyu Kajika frog – drainage ditch

The eggs are laid in slow moving and still water sources. The eggs will develop into tadpoles and eventually transform into baby frogs.  I often find tadpoles thriving in farming water buckets.

Ryukyu Kajika frog

Ryukyu Kajika frog -tadpoles

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tadpole transformation- metamorphosis

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Juvenile Kajika frog

The summer months provide a great opportunity for natural predators.The frogs come together in a large numbers.

Crab feeding on frogs

Crab feeding on frogs

Ryukyu Kajika frog

Pryer’s keelback feeding

If you see frogs, there is a possibility that snakes are near by. The snakes patiently wait for frogs in drainage ditches and still water sources. The Kajika frog is the Hime habu’s favorite meal.

Hime habu - GoPro

Hime habu – GoPro

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Asian grass frog – Amphibians of the Ryukyu Islands

The Asian grass frog  ( Fejervarya limnocharis ) is found on Mainland Japan and most of the Ryukyu Islands. The warty frog is fairly common on Okinawa. It’s biggest threats are pesticide exposure and habitat loss.

  • Scientific name: Fejervarya limnocharis
  • Common name: Asian grass frog, marsh frog and common pond frog
  • Distribution: Ryukyu Islands and Mainland Japan
  • Habitat: Rice fields, ditches, marshes, parks and farm fields.
  • Diet: Insects
  • Average size: 45mm-75mm
  • Color: light brown with a white belly
Asian grass frog - 60mm macro

Asian grass frog – Canon 70d * 60mm macro

Wide angle macro - Canon 70d *Tokina fisheye

Wide angle macro – Canon 70d *Tokina fisheye

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Asian grass frog- Macro

Asian marsh frog - drainage ditch

Asian marsh frog – drainage ditch

Asian marsh frog

Asian marsh frog

Asian grass frog feeding

Asian grass frog feeding

Asian marsh frog - Okuma resort

Asian marsh frog – Okuma resort

Asian grass frog -MYN

Asian grass frog -MYN

All images were taken with the Canon 70d  EFS 10-18mm, Canon 60mm or Tokina fish-eye lens, Scroll down to subscribe to my blog posts -

Okinawa green tree frog – Ryukyu Islands

The Okinawa green tree frog ( Rhacophorus viridis viridis ) is found on Okinawa, Iheya and Kume Island.

  • Scientific name: Rhacophorus viridis viridis
  • Common name: Okinawa Green tree frog
  • Distribution: Okinawa, Kume, and Iheya.
  • Habitat: Forests, mountain slopes and farm fields near water.
  • Diet: Insects
  • Average size: 45mm-75mm
  • Color: Olive green, Bright green and dark brown
Okinawa Green tree frog

Okinawa Green tree frog

This beautiful frog is a master of camouflage.  I often find it resting on tree branches, blending in with the surrounding green leaves.

Natural habitat

Natural habitat

Green tree frog

Green tree frog

Breading season stretches from February to April on Okinawa.

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Green tree frog mating

On Kume Island the tree frogs transform to a golden brown when mating.

Kume Island tree frog

Kume Island tree frog

They construct a foam nest on a tree branch above a still water source. Eventually the foam liquefies when the eggs are ready to hatch.

Frog foam nest

Frog foam nest

Not all frogs survive to make the nest. The Akamata is the most common snake on the Okinawan Islands.  It feeds on venomous habu snakes, baby sea turtles, lizards and frogs.

Akamata feeding

Akamata feeding

 

Photographed on white for the Meet your Neighbours global biodiversity project.

MYN Technique

MYN Technique

MYN Technique

MYN Technique

Green tree frog

Green tree frog

I often find this frog searching for insects on the road.

Roadside green tree frog

Roadside green tree frog

Let’s protect the wildlife of Okinawa.

 

 

Seagulls on Okinawa -

Every winter, I see a few Black-tailed gulls (Larus crassirostris) on our shorelines. They generally do not stay for longer than two weeks. In January 2016,  I photographed eight Black-tailed gulls on Nagahama beach. Four gulls had oil residue stuck on their feathers. The birds were constantly bathing in the sea water and preening. The Black-tailed gulls are abundant on the mainland, but on Okinawa they are a rare sight.

Juvenile Black-tailed gull

Possible reasons why there are no seagulls living on Okinawa.  

  • Warm water temperatures – too warm ( 68F- 88F)
  • Not enough food (fish, worms, mollusks)
  • Competition with other birds ( osprey, terns and crows )
  • Small land mass

A mature Black-tailed gull bathing and preening. It was working hard trying to get the oil residue off its feathers.

Black-tailed gull bathing

Black-tailed gull drying off

Shaking off

Shaking off

Black-tailed gull preening

Black-tailed gull preening

Black-tailed gull

Black-tailed gull

Black-tailed gull

Mature gulls feeding on fish scraps

Black-tailed gull feeding

Black-tailed gull feeding

Have a great day !    

Light-painting with the nightsea

Light painting is the artistic technique of moving a hand held-light source while taking a long exposure. The purpose is to illuminate the subject with constant lighting to create a powerful image.  It takes a steady hand, patience, trial and error and imagination. Using a specialized blue light (nightsea) will allow you to capture fluorescence. The images will be enhanced with beautiful bright vibrant colors.

Most plants and animals fluoresce under blue light. Below are some of my favorite long-exposures photographed using the Nightsea and a Canon 70d.  I also included some comparison photos under white light.

Beautiful cherry blossoms under blue light, Okinawa-Japan

Cherry blossum under blue light

Cherry blossom under blue light

Cherry blossum under blue light

Cherry blossom under blue light

Cherry blossum under white light (MYN)

Cherry blossom under white light (MYN)

 

Sunflowers show some fluorescence under blue light, Okinawa-Japan

Sundflower under blue light

Sundflower under blue light

Sunflower under white light -zoom panning

Sunflower under white light -zoom panning

 

The animal must not move in order to get a sharp image during a long-exposure.

Rhinoceros coconut  beetle under blue light

Rhinoceros coconut beetle under blue light

Rhinoceros coconut  beetle under white light

Rhinoceros coconut beetle under white light

The Rosy gypsy moth (Lymantria mathura) Under blue light

The Rosy gypsy moth (Lymantria mathura) Under blue light

The Rosy gypsy moth (Lymantria mathura) Under white light -

The Rosy gypsy moth (Lymantria mathura) Under white light -

 

More flowers painted with the Nightsea

Flowers under blue light

Flowers under blue light

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Flowers under blue light

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Cactus under blue light

Mochi leaf flower under blue light

Mochi leaf flower under blue light

Flower under blue light

Flower under blue light

Light-painting with the Nightsea and Sola 600 red light

Light-painting Okinawa

Light-painting Okinawa

Blue light comparison (450nm) with UV (385)

Blue 450 vrs uv385

Blue comparison – 450nm vrs uv 385nm

 

Equipment used

  • Light&Motion Nightsea or Gobe blue light
  • Modeling light Gobe 700 wide (white light) to lock in focus
  • Camera with Manual capabilities and macro lens (Canon 70d *60macro)
  • Manfrotto Tripod and remote
  • Barrier filter (block the reflected blue light )

 

Sola NightSea underwater blue light

Sola NightSea underwater blue light

My underwater setup for photographing fluorescence.

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Learn more-

http://www.lightandmotion.com/sola-nightsea