Joshua Tree National Park

image Early The earliest known residents of the land in and around what later became Joshua Tree National Park were the people of the Pinto Culture, who lived and hunted here between 8000 and 4000 BCE. Their stone tools and spear points, discovered in the Pinto Basin in the 1930s, suggest that they hunted game and gathered seasonal plants, but little else is known about them. A fourth group, the Mojaves, used the local resources as they traveled along trails between the Colorado River and the Pacific coast. In the 21st century, small numbers of all four peoples live in the region near the park; the Twentynine Palms Band of Mission Indians, descendants of the Chemehuevi, own a reservation in Twentynine Palms. In 1772, a group of Spaniards led by Pedro Fages made the first European sightings of Joshua trees while pursuing native converts to Christianity who had run away from a mission in San Diego. By 1823, the year Mexico achieved independence from Spain, a Mexican expedition from Los Angeles, in what was then Alta California, is thought to have explored as far east as the Eagle Mountains in what later became the park. Three years later, Jedediah Smith led a group of American fur trappers and explorers along the nearby Mojave Trail, and others soon followed. Two decades after that, the United States defeated Mexico in the Mexican–American War (1846–48) and took over about half of Mexico's original territory, including California and the future parkland. Post-1870 In 1870, white settlers began grazing cattle on the tall grasses that grew in the park. In 1888, a gang of cattle rustlers moved into the region near the Oasis of Mara. Led by brothers James B. and William S. McHaney, they hid stolen cattle in a box canyon at Cow Camp. Throughout the region, ranchers dug wells and built rainwater catchments called "tanks", such as White Tank and Barker Dam. In 1900, C. O. Barker, a miner and cattleman, built the original Barker Dam, later improved by William "Bill" Keys, a rancher. Grazing continued in the park through 1945. Johnny Lang and others, the original owners of the Lost Horse Mine, installed a two-stamp mill to process ore at the site, and the next owner, J.D. Ryan, replaced it with a 10-stamp steam-powered mill. Ryan pumped water from his ranch to the mill and cut timber from the nearby hills to heat water to make steam. Most of the structures associated with the mine fell apart, and for safety reasons, the National Park Service plugged the mine, which had collapsed. The ranch and mill were added to the NRHP in 1975 and the mine in 1976. Some of the mines in the park yielded copper, zinc, and iron. Protection On August 10, 1936, after Minerva Hoyt and others persuaded the state and federal governments to protect the area, President Franklin D. Roosevelt used the power of the 1906 Antiquities Act to establish Joshua Tree National Monument, protecting about . In 1950, the size of the park was reduced by about to open the land to more mining. The monument was redesignated as a national park on October 31, 1994, by the Desert Protection Act, which also added . In 2019, the park expanded by under a provision included in the John D. Dingell Jr. Conservation, Management, and Recreation Act. The Mojave Desert Land Trust (MDLT) has conserved within the park. These holdings were privately owned within the national park, which they were able to purchase. They also acquire private properties bordering federally protected properties. MDLT has sold of acquired private property to the National Park Service, which is more than any other similar organization. ==Geography ==

Potential natural vegetation According to the A. W. Kuchler U.S. Potential natural vegetation types, Joshua Tree National Park has two categories, a creosote bush potential vegetation type with a desert shrubland potential vegetation form in most of the area, and a juniper/pinyon pine potential vegetation type with a Great Basin montane forest/southwest forest potential vegetation form on the higher elevations of the western side of the park. Mojave Desert The higher and cooler Mojave Desert is the special habitat of Yucca brevifolia, the Joshua tree for which the park is named. It occurs in patterns from dense forests to distantly spaced specimens. In addition to Joshua tree forests, the western part of the park includes some of the most interesting geologic displays found in California's deserts. The dominant geologic features of this landscape are hills of bare rock, usually broken up into loose boulders. These hills are popular among rock climbing and scrambling enthusiasts. The flatland between these hills is sparsely forested with Joshua trees. Together with the boulder piles and Skull Rock, the trees make the landscape otherworldly. Temperatures are most comfortable in the spring and fall, with an average high/low of , respectively. Winter brings cooler days, around , and freezing nights. Snows occur occasionally at higher elevations. Summers are hot, over during the day and not cooling much below until the early hours of the morning. Cylindropuntia chuckwallensis (chuckwalla cholla), and Opuntia chlorotica (dollarjoint pricklypear). It is forecasted that by 2099, under the high emission scenario, the park will increase in temperature by 8 °F. This would make most of the national park unsuitable for Joshua tree growth. Under the low emission scenario, 80% of suitable Joshua tree habitat could be lost. Climate According to the Köppen climate classification system, Joshua Tree National Park has a hot desert climate (BWh). According to the United States Department of Agriculture, the plant hardiness zone at the Cottonwood Visitor Center at 3081 ft (939 m) elevation is 8b, with an average annual extreme minimum temperature of . Joshua Tree is becoming hotter and drier due to climate change. From 1895 to 2016, the annual precipitation has dropped by 39% and the annual temperature has increased by 3 °F. Because of the hotter and drier conditions, there are more wildfires in the park. ==Geology==

The park's oldest rocks, Pinto Gneiss among them, are 1.7 billion years old. They are exposed in places on the park's surface in the Cottonwood, Pinto, and Eagle Mountains. Much later, from 250 to 75 million years ago, tectonic plate movements forced volcanic material toward the surface at this location and formed granites, including monzogranite common to the Wonderland of Rocks, parts of the Pinto, Eagle, and Coxcomb Mountains, and elsewhere. Erosion eventually exposed the harder rocks, gneiss and granite, in the uplands and reduced the softer rocks to debris that filled the canyons and basins between the ranges. The debris, moved by gravity and water, formed alluvial fans at the mouths of canyons, and bajadas, where the alluvial fans overlapped. The rock formations of Joshua Tree National Park owe their shape partly to groundwater, which filtered through the roughly rectangular joints of the monzonite and eroded the corners and edges of blocks of stone, and to flash floods, which washed away covering ground and left piles of rounded boulders. These prominent outcrops are known as inselbergs. Of the park's six blocks of mountains, five—the Little San Bernardino, Hexie, Pinto, Cottonwood, and Eagle—are among the Transverse Ranges, which trend generally east–west in locations between the Eagle Mountains on the east and the northern Channel Islands, in the Pacific Ocean west of Santa Barbara, on the west. Tectonic forces along the San Andreas Fault system compressed and lifted the crust material that formed these ranges. The San Andreas Fault itself passes southwest of the park, but related parallel faults, including the Dillon, Blue Cut, and Pinto, run through the park, and movements along them have caused earthquakes. The easternmost range in the park, the Coxcomb Mountains, runs generally north–south and is part of the Basin and Range Province. ==Recreation==

Camping There are nine established campgrounds in the park. Several hiking trails are within the park, many of which connect to campgrounds. A section of the California Riding and Hiking Trail meanders for through the western side of the park. The lookout point at Keys View, towards the south of the park looks over the Coachella Valley, the Salton Sea, the San Andreas Fault, the Santa Rosa Mountains, and the city of Palm Springs. Nature walks inside the park include: • Hidden Valley Longer trails include: • Contact Mine • Fortynine Palms Oasis • Lost Horse Mine • Lost Palms Oasis • Ryan Mountain • Ruby Lee Mill Site Due to graffiti on at least 17 sites on trails, officials have closed them to the public. The closed sites include Native American sites, Rattlesnake Canyon, and Barker Dam. They blame the increase in vandalism on the increased use of social media. Climbing The park is popular with rock climbers and was originally a winter practice area while Yosemite Valley and other parts of the Sierra Nevada were snowbound, but later became an area of interest in its own right. Its thousands of named climbing routes contain all levels of difficulty. The routes are typically short, the rocks being rarely more than in height, but access is usually a short, easy walk through the desert, and doing several interesting climbs in a single day is possible. The rocks are all composed of quartz monzonite, a very rough type of granite, made even more so as no snow or ice polishes it, as in places such as Yosemite. Some routes are permanently closed, while others are closed temporarily to protect sensitive wildlife in certain seasons. Climbing and bouldering routes that are permanently closed include Energy Crisis, the Schwarzenegger Wall, Zombie Woof Rock, the Maverick Boulder formation, Pictograph Boulder, Shindig, Lonely Stones Area #3, and the Shipwreck formation, Indian Wave Boulders (except for Native Arete), and Wormholes. Visitation statistics The total visitors more than doubled from 2013 to 2019. Awareness of the wildflower bloom in the spring has brought increased visitation. Wildlife |left More than 250 bird species inhabit or visit the park, including resident desert birds such as the greater roadrunner, cactus wren, northern mockingbird, LeConte's thrasher, verdin, and Gambel's quail. About 78 species nest and raise their young within the park. Many migrating species spend only a short time feeding and resting at Joshua Tree, mainly in the winter, as the park lies along an inland stretch of the Pacific Flyway. Other species descend from their usual habitats in the mountains to escape winter snow. A USGS bird checklist from 2006 contained 239 species in the park. Astronomy , as seen in this 30-second exposure showing the Milky Way behind a silhouetted Joshua tree (July 2017) Joshua Tree is a popular observing site in Southern California for amateur astronomy and stargazing. The park is well known for its naturally dark night skies, which are far away from and largely free of the light pollution typical in urban areas. In 2017, the International Dark-Sky Association designated Joshua Tree a Dark Sky Park. ==Fauna and flora==

s at a burrow Around 2,145 combined plant, fungi and animal species have been documented within Joshua Tree National Park, according to the biodiversity database iNaturalist, with over 250 avian, 50 mammalian, 40 reptilian and amphibian, and nearly 1,000 invertebrate species known to inhabit the park boundaries and its immediate vicinities. In addition to the many birds, such as Gambel's quail and the greater roadrunner, numerous lizards, snakes, chipmunks, and California ground squirrels are the animals most likely to be seen by daytime visitors to the area. Additionally, nighttime sees several bat species take-flight, sometimes by the thousands, as they hunt the swarms of various flying insects in the park, or, dependent on species, feed on cactus blossoms and other sources of nectar, thus making the flying mammals vital insect controllers and plant pollinators. Known from Joshua Tree are the big brown bat, California myotis, canyon bats, little brown bats, Mexican free-tailed bats, Nyctinomops bats, pallid bats, Townsend's big-eared bat, and the western bonneted (mastiff) and western yellow bat. Many of the park's larger mammals prefer to rest in burrows, caves, or other protected hiding spots during the hottest portions of the day, with many being crepuscular in their habits (i.e. most active at sunset and sunrise) and resting sporadically throughout the day and night. Reclusive, but nocturnally-active, mammalian species include the American badger, black-tailed jackrabbit, bobcat, coyote, desert bighorn sheep, gray fox, kangaroo rat, mountain lion, mule deer and ringtail. Occasional sightings (or scat observations) of American black bear have occurred, with the bears likely roaming or exploring from the nearby San Gabriel Mountains (where they are more common). However, no known breeding population of black bear is known to exist permanently within park bounds, as it is likely that Joshua Tree's lower elevation and desert environment is simply unable to support bears long-term. Herpetiles are very plentiful in the park; among the many snakes are several species of rattlesnake (Crotalus sp.), kingsnake (Lampropeltis sp.), coastal rosy boa (Lichanura orcutti), ground snakes and shovelnose snakes (Sonora sp.), desert nightsnakes (Hypsigiena sp.) and racers and coachwhips (Masticophis sp.), among others. Other species most active at night include banded geckos (Coleonyx sp). The desert tortoise, a threatened reptile species that inhabits the creosote (Larrea tridentata)-studded lowlands of the Mojave Desert, is well-adapted to arid conditions; instead of drinking water directly, most of the tortoise's water is obtained from consuming the creosote bush as well as prickly pear (Opuntia sp.) pads and fruits, amongst other desert plants. The creosote is not only a favorite food for the desert tortoise, but is also one of the primary plants eaten by the chuckwalla, a large, diurnal lizard species. Amphibians, though few, are still present near water sources; the California tree frog (Pseudacris cadaverina) is found in greener, lush areas adjacent to permanent water sources (often created by the Pinto Fault), such as along the northern edge of the park, as well as near natural seeps and rocky areas that collect pooled water. The red-spotted toad (Bufo punctatus) is a true denizen of the desert, as it spends most of its life buried underground in a state of torpor, awaiting seasonal rains to emerge and breed en masse. The yucca moth (Tegeticula synthetica) is responsible for pollinating the Joshua trees after which the park is named. Animals that thrive in Joshua Tree often have special adaptations for dealing with limited water and high summer temperatures. The smaller mammals and all reptiles take refuge from the heat underground. Desert mammals make more efficient use of their bodies' water supply than the human body. Reptiles are physiologically adapted to thrive with little water, while most birds can fly to water when they most need to drink. Nevertheless, the many hidden springs and seeps in the park are vital for the survival of all resident animals. The majority of reptiles, amphibians, invertebrates, and many small mammals go into an inactive state of hibernation (or torpor) during the colder months. By comparison, winter is the time of greatest birdwatching opportunities in the park, with the region being a prime "rest-stop" for many migratory species on their annual flights to warmer locales. ==Wilderness==

Of the park's total land area of , are designated wilderness and managed by the National Park Service (NPS) per the Wilderness Act. The NPS requires registration for overnight camping at specific locations called registration boards. Other requirements include the use of a camp stove (since open campfires are prohibited) and employing Leave No Trace camping techniques (also known as "pack it in, pack it out"). Although bicycles are not allowed in wilderness areas, horses are, but a permit must be obtained in advance for travel in the backcountry. Cellular signals are weak to non-existent and should not be depended on while visiting the park. ==Vandalism==

On April 1, 2015, graffiti artist André was convicted and fined for vandalizing a boulder in the park. André had posted photos of his "artwork" on social media. Casey Schreiner (of the hiking blog Modern Hiker) and some of his followers aided the National Park Service in locating and identifying André's vandalism. Before his conviction, André had attempted to silence reporting with legal threats. During the 2018–2019 federal government shutdown, only eight park rangers were on duty; during this time, reports of vandalism spiked, as park visitors reportedly felled Joshua trees for firewood, set illegal campfires, drove off-road, and spray-painted rocks. Park botanists subsequently determined that one of three Joshua trees reported to have been cut down or otherwise damaged during the shutdown had been felled prior to the shutdown. ==See also==