EPOW - Ecology Picture of the Week

Each week a different image of our fascinating environment is featured, along with a brief explanation written by a professional ecologist.

1-7 March 2004

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Oriental Fire-bellied Toad

Oriental Fire-bellied Toad (Bombina orientalis), Family Bombinatoridae

Credit & Copyright: Dr. Bruce G. Marcot

Explanation:   Nearly two species in one, this Oriental fire-bellied toad of eastern Asia blends nearly invisibly into ferns and herbs of its forest floor habitat ... until it is riled, when it arches its back and displays its orange and black mottled ventrum.  This is likely a form of warning coloration, a caution or monition that the organism is toxic.  Such bright warning coloration -- called aposematism or aposematic coloration -- is one form of defense found in many other animals, including other frogs of the tropics.  

Such bright coloration might also play a role in courtship, territorial defense, and even bluff behavior in battles with rivals for mates, although this has not been documented in this species.

I encountered this specimen in the remote forest reserve of Shivki Field Station, Primoski Krai, Far East Russia, at 150 m elevation, during a trinational Russian-Chinese-American expedition.   


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Bruce Marcot Field Journal, 
Log Entries, 11-12 June 1994 

10:40 pm ... at kerosene-lantern dinner table at Shivki Field Station cabin ... tight table, family style dinner with much good humor, toasts in Russian with vodka, then in Chinese with baijou, their traditional liquor ... later, bedrolls on the floor, rustic.  No electricity or water.

Evening sunset was utterly spectacular, orange flames across the entire sky, muted by mist and fog.  Distant crepuscular call of a marsh bird, a band-bellied crake, from some unseen bog.  The field station here is on 10 km of nearly-impassable clay "roads."  In these rains, the roads are literally streams, and we sloshed and pounded upriver in the lorry like some impossible Jurassic salmon.  Dense hardwood jungle surrounds the house for kilometers.  Mosquitoes attack you in shark swarms and ticks cling to each leg -- must be very careful about the mosquito-borne Japanese encephalitis, and the tick-borne version of the same disease, and dose up on Deet.

Present in the Shivki Field Station forest are roe deer, red deer, and wild boar.  Further south in western Primorsky Krai are found spotted deer (Cervus nippon), escapees from breeding farms, that essentially have outcompeted and excluded red deer from the area, rendering the area much less suitable for tiger.  Red deer, along with wild boar, are the main native prey species of the tiger.  

Out in the forests at night in Shivki:  dense clouds of biting mosquitoes; the whistled trill call of the crake; and a cacophony of Japanese tree frogs, Hyla (arborea) japonica.  

Next day, and a seven-hour hike through the tick-infested Shivki jungles, and we spot old-world badger burrows, scat, and runways; red deer tracks; wild boar forage areas; brown bear claw marks on a tree trunk 7-8' high; and a good single print that I identify as Siberian tiger, only several hours old and on the same game trail we follow.  Our host and guide, Alexander "Sasha" Antonov, had seen a tiger here 2 years ago, and tiger tracks over the winter time, but this was the first summer time track.  

We catch a white-striped rat snake (Elaphe dione), a common frog (Rana chensinensis), a fire-bellied toad (Bombina orientalis), and a common toad (Bufo gargarizans).  The common toad usually breeds in late May, but we found a pair in amplexus (mating grasp), a late breeder.  Its Russian common name translates to "Far Eastern gray toad," and only 5 years ago or so was taxonomically split from Bufo bufo.  The fire-bellied toad was spectactular, its belly appearing like some orange-red flames.

Next week's picture:  A Tale of Two Chinese Landscapes


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