This is a list of Podicipediformes species by global population. While numbers are estimates, they have been made by the experts in their fields. For more information on how these estimates were ascertained, see Wikipedia's articles on population biology and population ecology.

The IOC World Bird List (version 15.1) recognizes 23 species of Podicipediformes, three of which are extinct. IUCN/BirdLife International have assessed and quantified population sizes for 22 of these species, excepting tricolored grebe. Additionally, IUCN/BirdLife International recognize a split in silvery grebe into northern and southern species.

There are three species listed as members of Podicipediformes which are extinct. They are as follows:

Alaotra grebe (Tachybaptus rufolavatus) - declared extinct in 2010, but last sighted in 1985. Atitlán grebe (Podilymbus gigas) - species declared extinct in 1986, following rapid decline. Colombian grebe (Podiceps andinus) - last confirmed sighting in 1977.

Species by global population Common nameBinomial namePopulationStatusTrendNotesImage Junin grebe Podiceps taczanowskii 140-320 Endemic to Lake Junín, Peru. Hooded grebe Podiceps gallardoi 650-800 Total population estimated at 3,000 – 5,000 in mid-1980s. Madagascar grebe Tachybaptus pelzelnii 1,000-2,499 New Zealand grebe Poliocephalus rufopectus 1,000-5,000 Best estimate for breeding population is 2,000-4,000 individuals. Hoary-headed grebePoliocephalus poliocephalus16,600-670,000Total population is estimated to be 25,000-1,000,000 individuals.Australasian grebeTachybaptus novaehollandiae16,800-687,000?Total population is estimated to be 25,203-1,031,000 individuals.Least grebeTachybaptus dominicus20,000-500,000Great grebePodiceps major26,700-93,300Total population is estimated to be 40,000-140,000 individuals.Southern silvery grebe (Silvery grebe)Podiceps occipitalis67,700-68,500Note that IUCN/BirdLife International list the Northern silvery grebe (P. juninensis) as a separate species. Population has not been quantified, but it is listed as Near Threatened. IOC retains this species as a subspecies within P. occipitalis.White-tufted grebeRollandia rolland 68,800-70,100Total population is estimated to be 103,250-105,200 individuals. Western grebe Aechmophorus occidentalis 80,000-90,000 Clark's grebe Aechmophorus clarkii 81,000 Red-necked grebe Podiceps grisegena 190,000-290,000 Values provided are an estimate of the total population. Horned grebe Podiceps auritus 239,000-583,000 Values provided are an estimate of the total population. Little grebe Tachybaptus ruficollis 384,000-2,350,000 ? Total population is estimated to be 575,997-3,525,996 individuals. Note that the IOC has split the tricolored grebe from this species.

IUCN/BirdLife International maintain both species within T. ruficollis.Pied-billed grebePodilymbus podiceps500,000 Great crested grebe Podiceps cristatus 609,999-997,000 ? Total population is estimated to be 915,000-1,400,000 individuals. Black-necked grebe Podiceps nigricollis 3,900,000-4,200,000 ? Values provided are an estimate of the total population.

See also

Lists of birds by population Lists of organisms by population

References