The Alaotra Grebe (Tachybaptus rufolavatus), also known as Delacour’s Little Grebe or Rusty Grebe, is or was a grebe found only on Lake Alaotra and surrounding lakes in Madagascar. The last sighting (which may have been a hybrid with the Little Grebe) was in 1988 and it may well be extinct, but all areas of remaining habitat have yet to be thoroughly searched.

This species declined in the course of the 20th century, mainly due to habitat destruction and predation by introduced snakehead murrel (Channa striata) (Andrianandrasana et al., 2005). Also, the few remaining birds increasingly hybridized with Little Grebes which use the wetlands as a migration stopover site; as the species differed in several key aspects, the hybrid birds may have suffered from decreased fitness, to the detriment of the rufolavatus gene pool.

The rediscovery of the Madagascar Pochard in 2006  (which also went extinct on Lake Alaotra) may be taken as an indication that searches should not be postponed. Unlike this species however, the grebe had poor powers of dispersal and was never found elsewhere.

It is listed as “Critically Endangered” on the IUCN Red List, although BirdLife International, the official Red List authority for birds, add that it is “Possibly Extinct”.


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s