Mountain Plover

FUN AND INTERESTING FACTS ABOUT MOUNTAIN PLOVERS

 

The Mountain Plover is misnamed, as it lives on level land. Unlike most plovers, it is not usually found near bodies of water or even on wet soil, it prefers dry habitat with short grass (usually due to grazing) and bare ground.

 

Calls: The Mountain Plover is much quieter than its more familiar relative the Killdeer, and it lacks the contrasting dark breast band common to many other plovers. Its calls are variable, often low-pitched trilled or gurgling whistles. In courtship it makes a sound much like a far-off cow mooing.

 

Distribution: Mountain plovers are one of only 12 grassland birds endemic to the western Great Plains. They nest on bare ground in early spring. They are a migratory bird that breeds across the western Great Plains and Rocky Mountain states, from the Canadian border to northern Mexico, and winter in California, southern Arizona, Texas and Mexico. Mountain plovers only nest in areas with sparse vegetation or bare ground, such as prairie dog towns. Loss of these areas because of crop planting or the removal of prairie dogs, is the biggest threat to the mountain plover's population. By early November, most move southward and westward to their wintering grounds. About 85 percent of the population winters in the San Joaquin and Imperial Valleys in California.

 

Feeding: Mountain Plovers feed mostly on insects and other small arthropods. It often associates with livestock, which attract and stir up insects.

 

Breeding: Mountain Plovers nest on bare ground in early spring. The breeding territory must have bare round with short, sparse vegetation. Plovers usually select a breeding range that they share with bison and black tailed prairie dogs. These animals are grazers that keep vegetation short. Plovers like to nest among prairie dog colonies because the foraging and burrowing that these animals do expose even more bare soil which creates an ideal habitat for plover nest sites. It is believed that plovers like to nest on bare soil because they blend into the land hiding them from birds that may prey on them and the short vegetation allows them to easily detect predators on the ground. It is also believed it is easier for them to spot insects to eat. A Mountain Plover nest has a survival rate that ranges from 26%-65%. This wide range may be due to the impact that varying climate has on nest survival. A nest made in a colder climate with less precipitation has a better chance of survival. These conditions are preferred because of the climate's effect on the eggs directly, changes in predatory behavior, or changes in vegetation that can affect the mortality rates of parents. Higher heat may expose eggs to heat stress. Also, a wetter climate may be factor in predators having a more sensitive sense of smell, aiding the discovery of nests. Nest predators are the biggest cause of nest destruction. Because of this, it is a primary driving force of survival rate. Their breeding season extends over the summer months and ends sometime around late July or early August. During mating the male will set a territory and perform displays to attract a female. Females lay multiple clutches of eggs with three eggs to a clutch; the eggs are off-white with blackish spots. Egg size decreases as the breeding season goes on because of the high energy cost on the females. It has been found that eggs laid during a time of drought tend to be larger providing the incubating chick with more nourishment and so a greater chance at survival. Mountain plovers perform uniparental incubation by both sexes. Females leave their first clutch to be incubated and tended to by the male and then lay a second clutch, which she tends to herself. This type of incubation suits the mountain plover well and allows for a greater yield of chicks compared to similar species of birds in which both the male and female tend a single clutch together. Females can mate with several males and have several male tended nests in one breeding season. This would result in a greater reproductive success for the female but there is a high energy cost on the female laying so many eggs. Therefore, it is more common for a female to lay only two clutches. If the eggs survive various dangers, especially such predators as Coyotes, snakes, and foxes, they hatch in 28 to 31 days, and the hatchlings leave the nest within a few hours. In the next two or three days, the family usually moves one to two kilometers from the nest site to a good feeding area, often near a water tank for livestock.

 

Threats: The loss of nesting habitat is the biggest threat to mountain plovers. Prairie dog colony extermination, lack of natural fire regimes, and the conversion of native prairie for agriculture and energy development all contribute to habitat loss and change.

 

Population Declines: The population has been estimated at between 11,000 and 14,000 adult birds, with a total population estimate of about 15,000 to 20,000. In March 2009, a multi-agency report, the first of its kind, issued by the Cornell University Lab of Ornithology in conjunction with federal agencies and other organizations, indicated that the Mountain Plover is one of the birds showing serious declines in population. The population of mountain plovers is in decline because of cultivation, urbanization, and over-grazing of their living space.

 

Listing: These downhill trends led to a 1999 proposal to list them as a Threatened species. On June 29, 2009 the U.S. Fish and Wildlife Service published a proposed rule to list the mountain plover as threatened under the Endangered Species Act. However, after a thorough review of all available scientific and commercial information, the Fish and Wildlife Service determined on May 11, 2011 that the mountain plover is not threatened or endangered throughout all or a significant portion of its range, and they withdrew their proposed rule to list the mountain plover as threatened under the Endangered Species Act.

 

Preservation: Mountain plovers like to build their habitats in prairie dog colonies, meaning that an increase in prairie dogs will coincide with an increase in mountain plovers. This knowledge can be useful in mountain plover conservation efforts. The loss of prairie dog colonies is a huge threat to mountain plovers. If prairie dog colonies can be preserved, there is a greater chance that mountain plovers can be saved. Other proposed plans of preservation include protecting remaining breeding and wintering habitats, and stopping the conversion of grasslands for agricultural purposes. The connection between mountain plovers and prairie dogs is particularly strong in Montana, but less so in the grasslands of Colorado and the grasslands and shrub-steppe habitats of Wyoming. In places where prairie dogs aren’t as prominent in the ecosystem, fire or grazing can act as substitutes for prairie dogs in creating suitable plover nesting because they maintain low vegetation. In the construction of suitable plover habitats, more success would be found in short-grass prairie habitats. However, concerning conservation, a large portion of the overall plover population breeds near the northern limit of their range in Montana, and it would be wise to make this area a conservation priority. The population of plovers in Wyoming is lower than that of other states, but Wyoming’s population of mountain plovers and mostly intact expanses of grazed rangeland will probably become much more important in the coming years as urban and agricultural development continues in contiguous states. In Oklahoma, 90% of mapped mountain plover locations are in cultivated fields, often bare and flat. Their preferred land areas contain clay loam soils, as the sandier soils are less reliable when sand can easily be blown around, covering nests, obscuring vision, and irritating eyes.

 

Mountain Plovers are important to the ecosystem at large because they are considered indicators of the health of their respective habitats. Local population managers can best help the plovers by protecting the land and prairie dog colonies from human disturbances such as mining, and monitoring the size and health of suitable plover habitat in each region.

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