List of Podicipediformes by population
From Wikipedia, the free encyclopedia
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.[1] 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.[2]
- Atitlán grebe (Podilymbus gigas) - species declared extinct in 1986, following rapid decline.[3]
- Colombian grebe (Podiceps andinus) - last confirmed sighting in 1977.[4]
Species by global population
| Common name | Binomial name | Population | Status | Trend | Notes | Image |
|---|---|---|---|---|---|---|
| Junin grebe | Podiceps taczanowskii | 140-320[5] | EN[5] |  [5] | Endemic to Lake Junín, Peru.[5] |  |
| Hooded grebe | Podiceps gallardoi | 650-800[6] | CR[6] |  [6] | Total population estimated at 3,000 – 5,000 in mid-1980s.[6] |  |
| Madagascar grebe | Tachybaptus pelzelnii | 1,000-2,499[7] | EN[7] | [7] |  | |
| New Zealand grebe | Poliocephalus rufopectus | 1,000-5,000[8] | LC[8] |  [8] | Best estimate for breeding population is 2,000-4,000 individuals.[8] |  |
| Hoary-headed grebe | Poliocephalus poliocephalus | 16,600-670,000[9] | LC[9] | [9] |
Total population is estimated to be 25,000-1,000,000 individuals.[9] |  |
| Australasian grebe | Tachybaptus novaehollandiae | 16,800-687,000[10] | LC[10] | ?[10] | Total population is estimated to be 25,203-1,031,000 individuals.[10] |  |
| Least grebe | Tachybaptus dominicus | 20,000-500,000[11] | LC[11] | [11] |
 | |
| Great grebe | Podiceps major | 26,700-93,300[12] | LC[12] | [12] |
Total population is estimated to be 40,000-140,000 individuals.[12] | .jpg) |
| Southern silvery grebe
(Silvery grebe) |
Podiceps occipitalis | 67,700-68,500[13] | LC[13] | [13] |
Note 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.[14]
IOC retains this species as a subspecies within P. occipitalis.[1] |
 |
| White-tufted grebe | Rollandia rolland | 68,800-70,100[15] | LC[15] | [15] |
Total population is estimated to be 103,250-105,200 individuals.[15] |  |
| Western grebe | Aechmophorus occidentalis | 80,000-90,000[16] | LC[16] | [16] |  | |
| Clark's grebe | Aechmophorus clarkii | 81,000[17] | LC[17] | [17] |  | |
| Red-necked grebe | Podiceps grisegena | 190,000-290,000[18] | LC[18] | [18] | Values provided are an estimate of the total population.[18] | .jpg) |
| Horned grebe | Podiceps auritus | 239,000-583,000[19] | VU[19] | [19] | Values provided are an estimate of the total population.[19] | .jpg) |
| Little grebe | Tachybaptus ruficollis | 384,000-2,350,000[20] | LC[20] | ?[20] | Total population is estimated to be 575,997-3,525,996 individuals.[20]
Note that the IOC has split the tricolored grebe from this species.[1] IUCN/BirdLife International maintain both species within T. ruficollis.[21] |
 |
| Pied-billed grebe | Podilymbus podiceps | 500,000[22] | LC[22] | [22] |
 | |
| Great crested grebe | Podiceps cristatus | 609,999-997,000[23] | LC[23] | ?[23] | Total population is estimated to be 915,000-1,400,000 individuals.[23] |  |
| Black-necked grebe | Podiceps nigricollis | 3,900,000-4,200,000[24] | LC[24] | ?[24] | Values provided are an estimate of the total population.[24] | _im_NSG_Wagbachniederung_2_(crop).jpg) |
