California coastal sage and chaparral | |
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![]() Coastal sage and chaparral of Santa Clarita Woodlands Park | |
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Ecology | |
Realm | Nearctic |
Biome | Mediterranean forests, woodlands, and scrub |
Borders | |
Bird species | 291 [1] |
Mammal species | 74 [1] |
Geography | |
Area | 32,970 km2 (12,730 sq mi) |
Countries | |
States | |
Rivers | Los Angeles River, San Diego River, Malibu Creek, San Gabriel River, Santa Ana River, Santa Clara River, Tijuana River, Ventura River |
Climate type | Mediterranean (Csa) |
Conservation | |
Conservation status | Critical/Endangered [2] |
Global 200 | Yes |
Habitat loss | 18.5% [1] |
Protected | 17.8% [1] |
The California coastal sage and chaparral (Spanish : Salvia y chaparral costero de California) is a Mediterranean forests, woodlands, and scrub ecoregion, defined by the World Wildlife Fund, located in southwestern California (United States) and northwestern Baja California (Mexico). It is part of the larger California chaparral and woodlands ecoregion. The ecoregion corresponds to the USDA Southern California ecoregion section 261B, [2] and to the EPA Southern California/Northern Baja Coast ecoregion 8. [3]
The California coastal sage and chaparral ecoregion covers about 12,730 square miles (32,970 km2) of coastal terraces, plains, and foothills between Santa Barbara, California and northeastern Baja California. [4] This includes the southwestern slopes of the Transverse and Peninsular Ranges, the entirety of the Santa Susana and Santa Monica Mountains, the Channel Islands, Guadalupe Island, and Cedros Island.[ citation needed ]
Major urban centers located within this ecoregion include Greater Los Angeles, San Diego-Tijuana, Ensenada, and Tecate.
The climate is Mediterranean, with mild, wet winters and hot, dry summers. [2] Almost all of the daily maximum temperatures lie between 16 and 27 °C (61 and 81 °F). [4] Mean annual precipitation is generally below 12 inches (300 mm), [4] although can be as high as 26 inches (660 mm) in the Santa Monica Mountains and hills around the Los Angeles Basin. [3]
The plant species of the California coastal sage and chaparral ecoregion are diverse, with high endemism. [2] The main plant communities are coastal sage scrub, California coastal prairie, chamise chaparral, southern oak woodland, pine forests, riparian woodland, and salt marshes. [5] [4]
Prominent coast adjacent species include: California sagebrush ( Artemisia californica ) and brittlebush ( Encelia californica ), along with black sage ( Salvia mellifera ), purple sage ( Salvia leucophylla or Salvia clevelandii ), bush monkeyflower ( Mimulus longiflorus or Mimulus aurantiacus ), and California buckwheat ( Eriogonum fasciculatum ). [5] : 328–333
Cacti and succulents can be found in the southern areas of this coastal ecoregion in Baja California. [4] Examples of succulents in this ecoregion include: Shaw's agave ( Agave shawii ), coastal dudleya ( Dudleya caespitosa ), golden cereus (Bergerocactus emoryi), and other prickly pear ( Opuntia ), Yucca and Dudleya species. [2]
Some of the endemic plants to the ecoregion's southern coast zone include: San Diego thornmint ( Acanthomintha ilicifolia ), San Diego ambrosia ( Ambrosia pumila ) and San Diego barrel cactus ( Ferocactus viridescens ).[ citation needed ]
Higher up from the shoreline, above an elevation of 1,000 feet (300 m), [5] : 327 the slopes are densely covered in chaparral shrubs, such as: chamise ( Adenostoma fasciculatum ), and California lilac ( Ceanothus spp.) and manzanita ( Arctostaphylos glandulosa , Arctostaphylos glauca , and Arctostaphylos patula ) . [2] [5] : 344–350 Chaparral yucca ( Hesperoyucca whipplei ) is commonplace throughout the climate zone.[ citation needed ] Other species include mountain mahogany ( Cercocarpus betuloides ), silk-tassel bush ( Garrya fremontii ), and ribbonwood ( Adenostoma sparsifolium ) [5] : 350–353
California oak woodland occurs in moist areas usually up to 4,900 feet (1,500 m). [6] [5] : 387 These woodlands include oak species, such as coast live oak ( Quercus agrifolia ), canyon live oak ( Quercus chrysolepis ), and Engelmann's oak ( Quercus engelmannii ). Associated species include the California black walnut ( Juglans californica ) on some north faces of the Santa Monica Mountains, Santa Susana Mountains, and the San Jose Hills; and poison oak ( Toxicodendron diversilobum ). [5] : 387–388
Riparian woodlands up to 5,000 feet (1,500 m) are dominated by western sycamore ( Platanus racemosa ) and various willow species such as Salix gooddingii , Salix laevigata , and Salix lasiolepis . Riparian understory contains California laurel ( Umbellularia californica ) and Pacific madrone ( Arbutus menziesii ). [5] : 393–394
Mountain conifers dominate above 6,000 feet (1,800 m). [5] : 327 These include species such as the sugar pine ( Pinus lambertiana ), ponderosa pine ( Pinus ponderosa ), Jeffrey pine ( Pinus jeffreyi ), Coulter pine ( Pinus coulteri ), Bigcone Douglas-fir ( Pseudotsuga macrocarpa ), and incense cedar ( Calocedrus decurrens ). [4]
Some endemic tree species mark niche ecological islands. One example is the rare Torrey pine ( Pinus torreyana ), which is only native to the coastal bluffs in Torrey Pines State Natural Reserve near San Diego, and off the coast on Santa Rosa Island. [4] Another example is the Tecate Cypress ( Cupressus forbesii ), which only occurs in four stands near the Mexican border of California. The Tecate Cypress only occurs in alkaline soils eroded from gabbro. [5] : 399
The Channel Islands are mostly covered in coastal sage and chamise chaparral with some oak woodland including endemic and/or rare: buckwheats ( Eriogonum spp.), oaks (such as island oak— Quercus tomentella ), and Dudleya species restricted to these islands. [2] Bishop pine also occurs on these islands.
In and around these different habitats, this diverse ecoregion also contains 'patches' of grasslands with native or introduced grass species and serpentine barrens.[ citation needed ]
Seasonal wetlands, such as vernal pools, form ecological islands. There are more than 30 wildflower species that are endemic to the pools in this ecoregion, including Orcuttia californica grass. [7] One subspecies of meadow-foam, Limnanthes alba ssp. parishii is only found in the ephemeral wetlands of the Laguna Mountains (and also 800 mi or 1,300 km away in the Klamath Mountains). [5] : 395–396
Wildfires are part of the natural fire ecology throughout the ecoregion. Habitats of this hot, dry coast must survive and revive following the regular forest fires, and the dominant plant species have adapted to recover from fires. [4]
The coastal sage and chaparral of California are home to a variety of small mammals, such as deer mice, desert woodrats, and desert shrews. Predators include mountain lions, coyotes, grey foxes, and bobcats. [5] : 378–384
Lizards of note include side-blotched lizards, western fence lizards, sagebrush lizards, and the San Diego subspecies of the coast horned lizard. Resident snake species include large carnivores such as common kingsnakes, gopher snakes, rosy boas, and western rattlesnakes. [5] : 365–373
Invertebrates of note include the cheese-weed moth lacewing ( Chrysoperla species). The Hermes copper and Quino checkerspot butterflies among the 200 butterfly species found here.[ citation needed ] Vernal pools in the ecoregion are home to Riverside fairy shrimp ( Streptocephalus woottoni ).[ citation needed ]
Typical birds of the region include scrub jays, wrentits, and rufous-sided towhees. Predatory birds include great horned owls and red-tailed hawks. [5] : 374–377
The California gnatcatcher is a small bird, endemic to this coastal ecoregion, which has been protected as its habitat is now designated an Important Bird Area. Other birds found here are the endemic Nutall's woodpecker ( Picoides nuttallii ) of the oak woodland, and the coastal populations of the protected cactus wren ( Campylorhynchus brunneicapillus ).[ citation needed ]
Important Bird Areas in Mexico include Isla Guadalupe and Isla Cedros, and parts of Sierra de Juárez and Sierra de San Pedro Mártir.[ citation needed ]
This attractive coastline is highly vulnerable to urban, recreational, and agricultural development and only 15% of original habitat is intact. [8] Habitats are vulnerable to livestock grazing, which has removed much native vegetation on the Channel Islands, such as Santa Cruz where sheep were grazed for over 100 years.
Another threat, ironically, is fire control, which only allows the amount of dry material in the forest to build up, resulting eventually in massive fires. However, in many chaparral regions such as the Santa Monica Mountains, increased fire frequency is the larger concern because fire return intervals in mature chaparral communities should be 30–150 years, unlike much of the region which often has return intervals of 20 years or less. [9] [10]
There are patches of coastal sage scrub in Marine Corps Base Camp Pendleton, the Santa Monica Mountains, the San Joaquin Hills near Laguna Beach, and the Irvine Ranch in Orange County, California. Additional patches of coastal sage scrub exist in Southern California in the Angeles National Forest.
A 2017 assessment found that 1,925 km2, or 6%, of the ecoregion is in protected areas. [11] Protected areas include Channel Islands National Park, Santa Monica Mountains National Recreation Area, Point Mugu State Park, Malibu Creek State Park, Topanga State Park, Griffith Park, Santa Susana Pass State Historic Park, Ballona Wetlands State Ecological Reserve, Chino Hills State Park, Crystal Cove State Park, the Santa Rosa Plateau Reserve, and Torrey Pines State Natural Reserve.
In Baja California, the chaparral ecology of Guadalupe Island, Isla Todos Santos, and the Coronado Islands are protected within the Baja California Pacific Islands Marine Conservation Area. [12]
Chaparral is a shrubland plant community found primarily in California, in southern Oregon and in the northern portion of the Baja California Peninsula in Mexico. It is shaped by a Mediterranean climate and infrequent, high-intensity crown fires.
The California chaparral and woodlands is a terrestrial ecoregion of southwestern Oregon, northern, central, and southern California and northwestern Baja California (Mexico), located on the west coast of North America. It is an ecoregion of the Mediterranean forests, woodlands, and scrub biome, and part of the Nearctic realm.
The Peninsular Ranges are a group of mountain ranges that stretch 1,500 km (930 mi) from Southern California to the southern tip of the Baja California peninsula; they are part of the North American Pacific Coast Ranges, which run along the Pacific coast from Alaska to Mexico. Elevations range from 150 to 3,300 m.
The ecology of California can be understood by dividing the state into a number of ecoregions, which contain distinct ecological communities of plants and animals in a contiguous region. The ecoregions of California can be grouped into four major groups: desert ecoregions, Mediterranean ecoregions, forested mountains, and coastal forests.
The Northern California coastal forests are a temperate coniferous forests ecoregion of coastal Northern California and southwestern Oregon.
The Sierra de Juárez, also known as the Sierra Juarez, is a mountain range located in Tecate Municipality and northern Ensenada Municipality, within the northern Baja California state of northwestern Mexico.
The Sierra Juárez and San Pedro Mártir pine–oak forests is a Nearctic temperate coniferous forests ecoregion that covers the higher elevations of the Sierra Juárez and Sierra San Pedro Mártir ranges of the Peninsular Ranges, of the northern Baja California Peninsula of Mexico. The pine–oak forests extend throughout the central portion of the Mexican state of Baja California and terminate near the border with the U.S. state of California.
The Sierra de la Laguna is a mountain range at the southern end of the Baja California peninsula in Mexico, and is the southernmost range of the Peninsular Ranges System.
Coastal sage scrub, also known as coastal scrub, CSS, or soft chaparral, is a low scrubland plant community of the California coastal sage and chaparral subecoregion, found in coastal California and northwestern coastal Baja California. It is within the California chaparral and woodlands ecoregion, of the Mediterranean forests, woodlands, and scrub biome.
The Sierra Madre Occidental pine–oak forests are a Temperate broadleaf and mixed forests ecoregion of the Sierra Madre Occidental range from the southwest USA region to the western part of Mexico. They are home to a large number of endemic plants and important habitat for wildlife.
The California Floristic Province (CFP) is a floristic province with a Mediterranean-type climate located on the Pacific Coast of North America with a distinctive flora similar to other regions with a winter rainfall and summer drought climate like the Mediterranean Basin. This biodiversity hotspot is known for being the home of the Sierran giant sequoia tree and its close relative the coast redwood. In 1996, the Province was designated as a biodiversity hotspot allowing it to join ranks among 33 other areas in the world with many endemic species. To be named a biodiversity hotspot, an area has to contain species and plant life that cannot be found anywhere else in the world. The California Floristic Province is home to over 3,000 species of vascular plants, 60% of which are endemic to the province.
Artemisia californica, also known as California sagebrush, is a species of western North American shrub in the sunflower family.
California oak woodland is a plant community found throughout the California chaparral and woodlands ecoregion of California in the United States and northwestern Baja California in Mexico. Oak woodland is widespread at lower elevations in coastal California; in interior valleys of the Coast Ranges, Transverse Ranges and Peninsular Ranges; and in a ring around the California Central Valley grasslands. The dominant trees are oaks, interspersed with other broadleaf and coniferous trees, with an understory of grasses, herbs, geophytes, and California native plants.
Eriodictyon capitatum, the Lompoc yerba santa, is a rare evergreen shrub in the borage family. It is endemic to western Santa Barbara County, in California.
Arctostaphylos glandulosa, with the common name Eastwood's manzanita, is a species of manzanita.
The California montane chaparral and woodlands is an ecoregion defined by the World Wildlife Fund, spanning 7,900 square miles (20,000 km2) of mountains in the Transverse Ranges, Peninsular Ranges, and Coast Ranges of southern and central California. The ecoregion is part of the larger California chaparral and woodlands ecoregion, and belongs to the Mediterranean forests, woodlands, and scrub biome.
The California interior chaparral and woodlands ecoregion covers 24,900 square miles (64,000 km2) in an elliptical ring around the California Central Valley. It occurs on hills and mountains ranging from 300 feet (91 m) to 3,000 feet (910 m). It is part of the Mediterranean forests, woodlands, and scrub biome, with cool, wet winters and hot, dry summers. Temperatures within the coast can range from 53° to 65 °F and 32° to 60 °F within the mountains. Many plant and animal species in this ecoregion are adapted to periodic fire.