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Southwestern Riparian Woodland

Description, importance and conservation status:

These riparian woodlands occur solely in the southwestern quadrant of the state, from the Arizona and Mexican border north to the San Francisco drainage and east to a few drainages on the east slope of the Black Range, such as Las Animas Creek in Sierra County. It is roughly defined by the presence of Arizona sycamore. However, an area lacking Arizona sycamore may be classified as Southwestern Riparian if it is within the boundaries described above and has some of the southwestern priority species listed below, e.g. San Simon Cienaga. Elevations range from 4000 - 7000ft.

Tree- and shrub-dominated habitat along lower streams or rivers requires permanent water or a consistently high water table. Southwestern riparian woodland is generally dominated by Arizona sycamore (Platanus wrightii), and/or cottonwood (Populus spp.). Goodding willow (Salix gooddingii) may be a codominant, often with fremont cottonwood. Other trees may include netleaf hackberry (Celtis reticulata), boxelder (Acer negundo), Arizona alder (Alnus oblongifolia), velvet ash (Fraxinus pennsylvanica), walnut (Juglans spp.), screwbean mesquite (Prosopis pubescens), honey mesquite (P. glandulosa) and western soapberry (Sapindus saponaria). Non-native trees and shrubs include russian-olive (Elaeagnus angustifolia) and salt cedar (Tamarix spp.). Understory vegetation may include New Mexico olive (Forestiera neomexicana), skunkbush (Rhus trilobata), rabbitbrush (Chrysothamnus spp.), sandbar willow (Salix sp.), seepwillow (Baccharis glutinosa), false indigo (Amorpha fruticosa), coyote willow (S. exigua), arrowweed (Pluchea sericea), silvery buffaloberry (Shepherdia argentea), and Parthenocissus creepers.

Gallery forests are important components of Southwestern Riparian Woodlands. In these forests, shade-tolerant species replace pioneering species, which require more open conditions. There is more available moisture in these forests as a result of reduced soil temperatures beneath the canopy. Mature forests resist flooding, resulting in reduced erosion and bank containment, except in extreme cases (Dick-Peddie 1993).

These riparian areas are the most species-rich in New Mexico. They support a higher percentage of breeding species than any other habitat due to their complex structural components, the continual presence of water, and their location in close proximity to Mexico. Marshes and other wetland habitats are created by widening river valleys or through the creation of oxbows. Stoleson and Finch (1998) have studied breeding bird density in six areas along the Gila River in southwestern New Mexico. They have documented some of the highest breeding bird densities north of Mexico.

The Gila River remains the only large, undammed river in New Mexico. Natural flooding regimes on this river, as well as the Mimbres, maintain the dynamic nature to which this habitat is adapted.

Impacts to habitat include: 1) habitat loss due to development or agriculture, 2) overgrazing, 3) recreation and off-road vehicle use, 4) lack of regeneration of cottonwood and willow due to altered flood regimes 5) lower water tables 6) water diversion or damming, 7) poor in-stream flow management, and 8) invasion of exotic weeds and grasses.

Several New Mexico high-priority species regularly breed only in Guadalupe Canyon in Hidalgo county. These are Broad-billed Hummingbird, Violet-crowned Hummingbird, and Thick-billed Kingbird.

Owners/managers of these lands include the US Forest Service, the state, and private land-owners.

Physiographic Areas covered: Mexican Highlands, Chihuahuan Desert and the Mogollon Rim

Associated priority species from Appendices B and C:

Table 1. Southwestern Riparian Woodland Priority Species

Highest Priority

Priority

High Responsibility

Common Black-Hawk
Common Ground-Dove
Elf Owl
Broad-billed Hummingbird
Violet-crowned Hummingbird
Elegant Trogon
Gila Woodpecker
Willow Flycatcher
Thick-billed Kingbird
Bell’s Vireo
Lucy’s Warbler
Summer Tanager
Abert’s Towhee

Zone-tailed Hawk
Gambel’s Quail
Yellow-billed Cuckoo
Brown-crested Flycatcher
Hooded Oriole

Black-chinned Hummingbird
Ash-throated Flycatcher
Bridled Titmouse

Additional Representative Species: Vermilion Flycatcher

Bird Habitat Requirements, Population and/or Habitat Objectives:
(in taxonomic order)

Common Black-Hawk (Schnell 1994)

Associated Species: Great Blue Heron, Black-crowned Night-Heron, Gila Woodpecker, Brown-crested Flycatcher, Lucy’s Warbler, Summer Tanager, Hooded Oriole, Bullock's Oriole

Distribution: Found along the Gila, San Francisco and Mimbres Rivers in the southwestern quadrant of the state as well as along the Rio Hondo in the southeast. They have nested occasionally along the Rio Grande as far north as Albuquerque.

Population and/or Habitat Objectives:

Zone-tailed Hawk (DeGraaf et al. 1991)

Associated Species: Western Screech-Owl, Whiskered Screech-Owl, Gila Woodpecker, Lucy=s Warbler, Grace=s Warbler, Summer Tanager

Distribution: found in southwestern NM and the Sacramento mountains. A small population exists around Los Alamos and Bandelier NM and possibly Mills Canyon along the Canadian River. The potential exists for small populations throughout the state.

Population and/or Habitat Objectives:

Common Ground-Dove (Williams 1999)

Associated Species: Gambel's Quail, Bell's Vireo, Abert's Towhee, Northern Beardless Tyrannulet, Varied Bunting, Crissal Thrasher

Distribution: Found most frequently in the lower Gila Valley (from Cliff south) and Hidalgo county, especially in Guadalupe Canyon. Also rarely in the Rio Grande Valley south from Socorro and in Eddy County. (Williams 1999)

Population and/or Habitat Objectives:

Elf Owl (Johnsgard 1988)

Associated Species: Common Poorwill, Gila Woodpecker, Acorn Woodpecker, Dusky-capped Flycatcher, Brown-crested Flycatcher, Bridled Titmouse, White-breasted Nuthatch, Lucy's Warbler

Distribution: Found in southwestern New Mexico, north to the Glenwood area and east to Las Animas Creek near Truth or Consequences. They occur as far north as the Magdalena mountains.

Population and/or Habitat Objectives:

Elegant Trogon (Kunzmann et al. 1998)

Associated Species: Zone-tailed Hawk, Elf Owl, Black-chinned Hummingbird, Dusky-capped Flycatcher, Hepatic Tanager, Brown-crested Flycatcher, Magnificent Hummingbird, Strickland's Warbler

Distribution: Currently found only in the Peloncillo Mountains

Population and/or Habitat Objectives:

Gila Woodpecker (Williams 1999)

Associated Species: Common Black-Hawk , Elf Owl, Northern Flicker, Brown-crested Flycatcher, Hooded Oriole

Distribution: Found in the lower Gila Valley in Hidalgo and Grant counties, Guadalupe Canyon, San Simon Cienaga, drainages of the Animas Mtns., and Bitter Creek in western Grant County.

Population and/or Habitat Objectives:

Southwestern Willow Flycatcher (Stoleson and Finch 1998)

Associated Species: Green Heron, Yellow-billed Cuckoo, Lucy’s Warbler, Yellow Warbler, Yellow-breasted Chat, Blue Grosbeak

Distribution: Core population for the United States in along the Gila River. Other populations scattered across the state but only one current nesting site east of the Rockies.

Population and/or Habitat Objectives:

Vermilion Flycatcher (DeGraaf et al. 1991)

Associated Species: Western Wood-Pewee, Black Phoebe, Yellow Warbler, Blue Grosbeak, Bullock's Oriole, Yellow-breasted Chat, Lucy's Warbler

Distribution: Found along rivers and streams in the south; in the East, north to Roswell with scattered others north to the Logan area, in the Rio Grande Valley north to Bosque del Apache NWR, and in the West, along Gila drainages, Guadalupe Canyon and the lower Mimbres.

Population and/or Habitat Objectives:

Bell's Vireo (Brown 1993)

Associated Species: Lucy's Warbler, Yellow-breasted Chat, Northern Cardinal, Blue Grosbeak, Painted Bunting, Abert's Towhee, Bullock's Oriole

Distribution: Found in the Pecos valley north to drainages west of Roswell, in the Rio Grande Valley, north to San Antonio, and in southwestern New Mexico, in the lower Gila, at San Simon Cienaga and Guadalupe Canyon (Williams 1999)

Population and/or Habitat Objectives:

Lucy's Warbler (Stoleson et al. 2000)

Associated Species: Yellow-billed Cuckoo, Gila Woodpecker, Summer Tanager, Black-headed Grosbeak, Blue Grosbeak, Bullock's Oriole

Distribution: Found in the southwestern quadrant of the state north in the Rio Grande Valley to Socorro and occasionally to Bernardo and in the west north to Glenwood area. Not found further east than the Rio Grande River.

Population and/or Habitat Objectives:

Summer Tanager (Robinson 1996)

Associated Species: Black-crowned Night-Heron, Cooper’s Hawk, Common Black-Hawk,, Lewis's Woodpecker, Lucy’s Warbler, Yellow Warbler, Blue Grosbeak

Distribution: Found in drainages in most of the southern two thirds of the state north to Cochiti, probably also regular in small numbers in the Canadian River drainage south of Mills Canyon.

Population and/or Habitat Objectives:

Abert's Towhee (Tweit and Finch 1994)

Associated Species: Gambel's Quail, Bell's Vireo, Bewick's Wren, Northern Cardinal, House Finch

Distribution: Found along the Gila River from the Arizona border to Mogollan Creek. Also found at San Simon Cienaga.

Population and/or Habitat Objectives:

Guadalupe Canyon only:

Thick-billed Kingbird (Williams pers. comm.)

Associated Species: Violet-crowned Hummingbird, Gila Woodpecker, Brown-crested Flycatcher, Phainopepla

Broad-billed Hummingbird (Williams 1999)

Associated Species: Black-tailed Gnatcatcher, Varied Bunting

Violet-crowned Hummingbird (Williams 1999)

Associated Species: Elf Owl, Brown-crested Flycatcher, Phainopepla

Population and/or Habitat Objectives for above three species:

Overall Habitat Strategies:

Whenever possible, it is recommended that conservation easements be obtained on lands with riparian areas. It is also suggested that riparian lands be purchased from willing sellers.

Grazing -Seasonal grazing, short duration, rest-rotation grazing, and appropriate stocking rates allow for the regeneration of cottonwood and willow. Grazing should be managed through these methods to establish appropriate riparian habitats. It is recommended that riparian areas be fenced for cattle exclusion with willing landowners.

Fire - Restore cottonwood, sycamore, and willow saplings as soon as possible after a fire in a riparian area.

Water - Restore natural flood cycles or manage water flow to emulate flood cycles on a regular basis, at least every five years, in conjunction with replanting of cottonwood, willow, and sycamore to create a mosaic of riparian successional stages. Provision of off-river water sources will reduce the demand on riparian systems. Management of uplands to restore natural hydrology is highly recommended. Avoid channelization of river corridors wherever possible.

Research and monitoring needs:

1. Determine Common Ground-Dove breeding locations within the state. Determine cause of declining Common Ground-Dove population.

2. Determine distribution and breeding density of Elf Owl in various habitats in the state.

3. Determine the number of Gila Woodpecker breeding pairs, distribution, habitat requirements, and limiting factors within New Mexico.

4. Determine habitat requirements for Lucy's Warbler in New Mexico.

5. Determine number of Abert's Towhee breeding pairs in the state.

6. Assess effectiveness of riparian restoration on bird populations on Gila and Mimbres.

7. Assess effects of irrigation on birds.

8. Assess effects of various grazing techniques on bird populations in riparian areas.

9. Assess effects of concentrated unofficial "campgrounds" in critical riparian areas on bird populations.

Additional species for which monitoring is recommended:

Table 2. Southwestern Riparian Woodland Priority Species: Habitat Factors

Species

Vegetation Composition/ Structure

Abiotic Factors

Landscape Factors

Special Factors

CBHA

gallery forests with cottonwood or sycamores averaging 75-100 ft.

streams averaging 30cm in depth; with moderate gradient and riffles

must have exposed perches and boulders near or in stream

chronic human disturbance will cause abandonment

ZTHA

cottonwood riparian forests or pine-oak associations; nest trees must be at least 30ft. high

may nest in steep canyons

often found in remote areas

often found far from human disturbance

ELTR

Arizona sycamore dominated riparian area with surrounding oaks; in AZ pine is also a critical component of habitat

often oaks on surrounding slopes

nests within 300m of water which may be a critical factor

secondary cavity nester

GIWO

mature cottonwood and/or sycamore forest

 

maintain patches of at least 20ha of mature cottonwood forest

 

WIFL

willow associated riparian areas (but see above for Gila R.); dense multi-storied understory; 3-10m willows for nesting

saturated soil or slow-moving water adjacent to nesting area

often found on broad, floodplains; avoids narrow and steep-sided canyons

 

VEFL

cottonwood/willow/hackberry/mesquite riparian areas

 

must be near water

 

BEVI

riparian vegetation dominated by seepwillow, mesquite or occasionally tamarisk; dense, multi-layered habitat in lower 9ft. of vegetation typical of early successional stages

 

often associated with water

 

LUWA

mature, closed canopy cottonwood forest

trees must be large enough to have loose bark or support woodpecker cavities

 

will not use nest boxes

SUTA

cottonwood/willow forests, nests average 35ft. high; may use tamarisk at higher elevations - tamarisk must be at least 20ft. high

 

 

bee and wasp specialist

ABTO

well-developed cottonwoods, dense understory often with Baccharis spp.

 

 

 

Guadalupe Canyon Table 2.

Species

Vegetation Composition/ Structure

Abiotic Factors

Landscape Factors

Special Factors

VCHU

broadleaf riparian forests with mature trees; needs large amounts of herbaceous cover with shrubs near stream bottoms

needs open areas near a stream with nearby xeric hillsides

typical hillsides often have sumac and algerita

all NM nests occur in Arizona sycamore in open cups with overhanging leaf cover for shade

BBLH

riparian woodlands and foothills; woodlands found in groves of sycamore/cottonwoods with dense mesquite

3000 - 5000ft elevation

arid and semi-arid habitats in mid-high elevation desert canyons; nests in thickets near edge of canyon primarily with a northern exposure, bordered by rock outcroppings with hackberry, algerita, and mesquite

has two nesting peaks: one starting mid-April coincides with peak blooming of Penstemon pseudospectabilis, the other starting in late June coincides with peak blooming of Agave parryi

TBKI

large trees in riparian broadleaf forests

open areas interspersed with large trees

 

often found foraging on hillsides in Guadalupe Canyon