Justification of Red List Category
This species is classified as Near Threatened because it has a moderately small population. However, it is continuing to decline as a consequence of habitat loss and degradation resulting from cultivation, urbanisation, over-grazing, and changes in native herbivore populations.
The global population was estimated to number 11,000-14,000 individuals, but this has recently been revised upwards to 15,000-20,000 individuals, roughly equivalent to 10,000-14,000 mature individuals.
This species underwent a large and statistically significant decrease over 40 years in North America, with a 66.5% decline over 40 years (23.9% per decade), according to data from Breeding Bird Survey and/or Christmas Bird Count (Butcher and Niven 2007). More recent data from BBS suggests a potential annual decline of 2.88%, which would equate to a decline of 36.6% over 3 generations (Sauer et al. 2017). However, there is a large margin of error and uncertainty with this estimate (see Sauer et al. 2017) and there is a suggestion that the population may be starting to stabilise (T. O'Connell in litt. 2016).
Charadrius montanus breeds in south Alberta and south-west Saskatchewan, Canada, and Montana, Wyoming (3,400 adults), eastern Colorado (8,600 individuals), Park County in Colorado (2,300 adults), New Mexico, the Oklahoma Panhandle (68-91 individuals), U.S.A. (Knopf 1996, Childers and Dinsmore 2008, McConnell et al. 2009), and potentially >100 individuals in Nebraska (S. Dinsmore in litt. 2016). It has bred in Texas, east Utah (Day 1994) and once in eastern Arizona (Knopf and Rupert 1999), and has apparently been extirpated from former breeding areas in North Dakota, South Dakota, and Kansas (McConnell et al. 2009). All these birds winter from Sacramento, San Joaquin and Imperial valleys, California (Knopf and Rupert 1995, S. D. Earsom and V. B. Estelle in litt. 1999), south to Baja California, Mexico (Wilbur 1987), and irregularly in south Arizona and south Texas in the Blackland Prairie (Knopf 1996, M. Lockwood in litt. 1999). There appears to be some mixing on the wintering grounds, with birds banded in Montana having been documented over-wintering in southern California, southeastern Arizona, and Texas (S. Dinsmore, in litt. 2016).
Abundant in the 19th century, it declined to an estimated 8,000-9,000 birds in 1995, including a 63% decrease from 1966-1991 (Knopf 1996), but the population is now estimated at 15,000-20,000 individuals (or 18,000-20,000 individuals [Andres et al. 2012]). These figures are likely to reflect an increase in counting accuracy rather than a recent population increase. Breeding was first successful in Nuevo León, Mexico, in 2004 (Gonzales Rojas et al. 2006) following an unsuccessful attempt in 1998 (F. L. Knopf in litt. 1998, 1999, Knopf and Rupert 1999), and in Coahuila in 1999 (Desmond and Ramirez 2002). These and/or northern birds regularly winter at Janos in Chihuahua (P. Manzano in litt. 1998, S. D. Earsom and V. B. Estelle in litt. 1999), with others reported from Sonora to Tamaulipas south to Zacatecas and San Luis Potosí (Howell and Webb 1995a, Gómez de Silva et al. 1996).
It nests in heavily grazed, shortgrass prairie, xeric scrub and fallow fields, typically on prairie dog Cynomys spp. colonies (Knowles et al. 1982, Knopf 1996, Knopf and Rupert 1999). It arrives in Canada and northern U.S.A. in late March-April and leaves in early August (Knopf 1996). It is a dietary generalist in winter (Knopf 1998) when it inhabits semi-desert, dry, bare agricultural land and (in Mexico) breeding-type habitats (S. D. Earsom and V. B. Estelle in litt. 1999). In the Imperial Valley (California) wintering flocks show a preference for burnt Bermudagrass fields and grazed alfalfa (Wunder and Knopf 2003). The species apparently fares better during drought years (Dinsmore 2008). It flocks in winter and on migration (S. D. Earsom and V. B. Estelle in litt. 1999).
Hunting probably explains the long-term decline. More recently, cultivation and urbanisation have reduced nesting habitat, and intensive grazing has resulted in desertification and a reduced prey base (S. D. Earsom and V. B. Estelle in litt. 1999). Large declines in grazing species, especially bison and prairie dogs, have resulted in unsuitable habitat succession (Piersma 1996, Knopf and Rupert 1999). Prairie dogs, which this species is particularly associated with, can be greatly affected by sylvatic plague (Dinsmore and Smith 2010), yet treatment of these species against this can have further detrimental effects on nesting success of the plover (Dinsmore 2013). Over 70% of nests on cultivated land are destroyed by farm machinery (Shackford et al. 1999), although Dreitz and Knopf (2007) suggest that nest success is comparable between cultivated land and grasslands - instead the cause of nest failure is different between the two habitat types. Mining activities within its range can have detrimental effects on this species (Andres and Stone 2010).
Conservation Actions Underway
CMS Appendix II. A Conservation Action Plan for this species was published in 2010 (Andres and Stone 2010). Pawnee National Grassland, Colorado, and Charles M. Russell National Wildlife Refuge, Montana, are important reserves (Shackford et al. 1999). It has been proposed for listing under the Federal Endangered Species Act (F. L. Knopf in litt. 1998, 1999). Black-tailed prairie dog Cynomys ludovicianus has also been proposed, partly because it helps to maintain suitable habitat (F. L. Knopf in litt. 1998, 1999). The release of Black-footed Ferret in Mexico is helping with prairie dog colony protection (B. Leachman in litt. 2003).
21-23.5 cm. Pale brown plover. Upperparts brownish grey, underparts whitish washed buff on breast sides and flanks, white forehead and supercilium contrasting with black frontal bar and lores, black bill and long, pale brown-yellow legs. Non-breeding adults lack black on head, have rufous fringes to fresh wing feathers, more extensive and buffy breast markings. Juvenile similar but supercilium buff and broader, more buffy fringes and marked underparts. In flight, looks long-winged and shows white wing-bar, underwing-coverts and in tail. Similar spp. American Golden Plover Pluvialis dominica is larger, darker and greyer, with darker legs and more patterned upperparts, in flight distinguished by white underwing and in tail. Voice Various drawn-out whistles and a sharp kip note.
Text account compilers
Harding, M., Mahood, S., Butchart, S., Pilgrim, J., Westrip, J., Bird, J., Benstead, P.
Estelle, V., Wunder, M., Earsom, S., Lockwood, M., Knopf, F., O'Connell, T., Dreitz, V., Leachman, B., Dinsmore, S., Manzano, P., Butcher, G.
BirdLife International (2019) Species factsheet: Charadrius montanus. Downloaded from http://www.birdlife.org on 17/11/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/11/2019.