2004b) that both Salvinia cucullata and Ludwigia adscendens (plants used extensively by foraging crakes, and, largely, forming the floating mat substrate) "disappeared from the Vientiane wetlands since the snail was introduced".
A guide to the rails, crakes, gallinules and coots of the world.
The White-browed Crake (Porzana cinerea) inhabits well-vegetated lowland nonflowing wetlands from Southeast Asia east through New Guinea and Australia to Polynesia (Taylor 1996, 1998).
The White-browed Crake has not been found in six other wetlands with dense semi-natural aquatic macrophytes around Vientiane city, which we visited during the same months as Nong Pen.
The White-browed Crake may be one of the many species overlooked in Laos up to 1950, but our records are part of a pattern of massive expansion since 1980 of its known Southeast Asia range (Fig.
observed White-browed Crake in February 1983 at Bung Buraphet, Thailand, ~400-500 km north of where the species had been recorded previously in Thailand and only a few months after the first reports from Bung Buraphet.
A single White-browed Crake occurred during 20-28 April 1991 in Hong Kong at Mai Po (Kennerley 1992, Carey et al.
The White-browed Crake is widespread in the Philippines (Dickinson et al.
Wells (1999) considered the White-browed Crake on the Thai-Malay peninsula "mostly dependant" on transient, man-made habitats.
That the White-browed Crake might greatly have expanded its geographic range is not a positive indication of overall marsh bird status in Indochina.