The species is monotypic, and has a vast range, which extends from Argentina to N America, and includes all of Brazil. RPPN Mãe-da-lua.
Name/classification in other taxonomic systems:
Porphyrio martinica CBRO 2011;
Porphyrio martinicus IOC V2.11.
Figure 1. The Purple Gallinule is one of the most common waterbirds in the interior of NE Brazil. In the rainy season (provided that it rains enough), Porphyrio martinicus breeds in the vegetation bordering reservoirs and lakes in the Caatinga. I made the photo above from a mobile hide, which was temporarily placed in the shallow lake of Fazenda Canaã, as shown here.
Migration: In the dry season, most water bodies in the Caatinga dry up, and many waterbirds leave the region. The Purple Gallinule also migrates, but I did not find detailed information about its destination.
Conservation: The Purple Gallinule is sought after by hunters. This could threaten the species in the long run. On the other hand, it appears that at least in the interior of Ceará, the (largely man-made) habitat is not endangered.
More information about Porphyrio martinicus can be found in Taylor 1998.To top of page
Then, starting around 11 secs into the recording, there is a similar song (not shown on sonogram), apparently from a different bird. At the end, this song blends with vocalizations from a Least Grebe Tachybaptus dominicus.
Also lots of frog and insect sounds.To top of page
To clarify whether there were really two vocalizing birds, I transformed the recording into an artificial sound, by changing the playback sampling rate from the original 44.1 kHz to 22.05 kHz. This results in a "slower" sound (speed divided by 2), which a human can follow more easily. Of course, the sound also becomes "lower" (frequencies divided by 2). Here it is: