The only confirmed reports of the creature come from the Hula Valley in northern Israel, whose wetlands were largely drained in the 1950s and where the frog was last seen in 1955, despite numerous surveys since then.
The Peace Athabasca Delta, the world's largest freshwater delta, set amidst the surrounding boreal forest ecosystem whose wetlands and forests store the greatest concentration of carbon of any ecosystem, and are being systematically destroyed to mine the tar that lies underneath.
"They say there is all this cleanup happening, but people haven't seen much," said Alexis Bonogofsky, who works for the National Wildlife Federation and whose hayfields and wetlands along the Yellowstone were flooded with oily water.
Hydrological processes maintain wetlands, whose position in the landscape determines their character and possible response to climate change.
The coastline measures about 200 km long and is composed of different shore types (categorized as sandy shores, rocky shores, muddy shores, mixed shores, calcareous limestone shores, cliffs and coastal wetlands) whose landforms are related to the coastal geomorphologic features.
In the Kibale National Park landscape in western Uganda, human-landscape relationships are typified by small-scale subsistence agriculture, in which households rely on resources provided in forests and wetlands, whose use is in turn shaped by perceptions of resource availability.
However the main attractions are natural: the stage between Cap de Favaritx and Arenal d'en Castell crosses the natural park of S'Albufera, a wetland whose abundant bird-life includes eagles, herons and nightingales.
"That is something you may not hear anymore if the United States is not careful," Mr. Méndez said, standing at the edge of the wetland, whose other endangered residents include the Yuma clapper rail and desert pupfish.
One such example concerns the uncertain future of Văcăreşti "Lake", our in-depth case study, which is an encapsulated 184 ha wetland whose management has been particularly poor.
For two years, urban wastewater was treated in a full-scale wetland whose construction was based on conclusions drawn from laboratory tests.
It is described as a thick wetland whose designers have described as "wild, naughty and hidden".
