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Trans-Pecos Ecoregion
Wildlife Management Plan for Presidio County, Texas
Presidio County covers 3,855 square miles of the Trans-Pecos, supporting an exceptional diversity of 144 documented wildlife species.
Intelligence Snapshot
Regulatory Complexity
Presidio County has elevated conservation considerations that affect wildlife management planning. The 7 federally listed species documented here mean that brush management, water development, and habitat modification must be designed with ESA compliance in mind. A properly calibrated plan accounts for these constraints. A generic plan does not.
Presidio County Ecological Profile
Presidio County contains 4 TPWD-managed areas including Big Bend Ranch State Park, Davis Mountains State Park, Fort Leaton State Historic Site, giving the county an unusually strong conservation anchor for its 3,855 square miles of desert grasslands and mountain basins. This is the most geographically diverse region in Texas, with elevations ranging from 2,500 feet along the Rio Grande to over 8,700 feet at Guadalupe Peak. The presence of Big Bend Ranch State Park and Davis Mountains State Park provides protected reference landscapes that demonstrate what this region looks like under long-term management.
Wildlife management in the Trans-Pecos is fundamentally about managing grazing pressure and protecting fragile desert grasslands from conversion to creosote-dominated shrubland. Once desert grasslands lose their perennial grass cover, recovery is extremely slow, measured in decades rather than years. Rotational grazing systems with long rest periods, minimal stocking rates, and strategic deferment during the monsoon growing season are essential. Water development is the highest-impact management practice in this arid landscape: solar-powered pumps lifting water from deep wells to wildlife-accessible troughs and guzzlers can transform the carrying capacity of desert rangeland. Predator management is a significant component of wildlife management plans in the Trans-Pecos, where mountain lion, coyote, and golden eagle all impact game populations.
Soil Conditions
Soils are typically shallow and rocky, with Lozier, Brewster, and Mariscal series limestones on mountain slopes and deeper Reakor and Hodgins loams on desert basin floors, all low in organic matter and extremely vulnerable to erosion once grass cover is lost.
Fire Ecology
Fire historically maintained the desert grassland-shrubland boundary. In the absence of fire, creosote bush, tarbush, and mesquite have invaded former grasslands across millions of acres. Restoring fire to these landscapes is challenging due to sparse fuel loads, but targeted burning following wet monsoon seasons can help recover grassland where sufficient perennial grass remains.
Mule deer replace white-tailed deer as the dominant cervid in the Trans-Pecos, with desert mule deer occupying the lower desert grasslands and Carmen Mountains white-tailed deer found in the higher mountain ranges. Pronghorn populations have been intensively managed and restocked across the region. Desert bighorn sheep, reintroduced to several mountain ranges after historic extirpation, represent one of Texas's greatest wildlife restoration successes. The region supports exceptional raptor diversity, including golden eagle, zone-tailed hawk, and peregrine falcon nesting on cliff faces. Montezuma quail, a secretive species dependent on oak-grassland habitat in the sky-island mountains, is a management priority. The Chihuahuan Desert also harbors the Texas tortoise and several endemic lizard species.
Presidio County Species of Conservation Concern
TPWD records document 144 species across 8 taxonomic groups in Presidio County, placing it among the most biologically rich counties in Texas. Plants (59 species) and Birds (29 species) represent the deepest inventories. The 7 federally listed and 24 state-protected species documented here represent meaningful regulatory considerations for any land management activity. Federally listed species include southwestern willow flycatcher, Mexican long-nosed bat, and Texas hornshell. Southwestern willow flycatcher: Nests in dense riparian willow and tamarisk thickets along rivers.
Primary Management Targets
mule deer, pronghorn, desert bighorn sheep, scaled quail
Listed Species
Nests in dense riparian willow and tamarisk thickets along rivers. Riparian management zones along waterways must be maintained. Removal of riparian vegetation in occupied habitat may require ESA consultation.
Pollinates agave and columnar cacti in the Trans-Pecos. Roosts in caves and mines. Cave disturbance and agave harvesting affect this species. Mine closures should include bat-compatible gates.
Freshwater mussel found in the Rio Grande and Pecos River. Water diversion, reduced flows, and poor water quality are primary threats. Flow maintenance is critical.
Western distinct population segment is threatened. Requires large patches of mature riparian woodland (cottonwood, willow) with dense understory. Clearing riparian corridors wider than 300 feet may trigger consultation in designated critical habitat.
Endemic to the Davis Mountains. Known from very few sites. Fire suppression and browsing by livestock may affect recruitment.
Found on limestone hills in the Trans-Pecos. Extremely slow-growing. Collection and habitat disturbance are threats.
Found in alkaline marshes in the Trans-Pecos. Groundwater withdrawal and marsh drainage are threats.
Nests in dense riparian willow and tamarisk thickets along rivers. Riparian management zones along waterways must be maintained. Removal of riparian vegetation in occupied habitat may require ESA consultation.
Pollinates agave and columnar cacti in the Trans-Pecos. Roosts in caves and mines. Cave disturbance and agave harvesting affect this species. Mine closures should include bat-compatible gates.
Freshwater mussel found in the Rio Grande and Pecos River. Water diversion, reduced flows, and poor water quality are primary threats. Flow maintenance is critical.
Endemic to the Davis Mountains. Known from very few sites. Fire suppression and browsing by livestock may affect recruitment.
Found on limestone hills in the Trans-Pecos. Extremely slow-growing. Collection and habitat disturbance are threats.
Depends on harvester ant colonies for food. Fire ant suppression and native grassland restoration directly benefit this species. Listed as state threatened.
Source: Texas Parks & Wildlife Department RTEST Database; U.S. Fish & Wildlife Service Critical Habitat Designations
Trans-Pecos Wildlife Management Standards
Management in Presidio County starts with water. In this arid landscape, solar-powered guzzlers and rainwater catchments transform carrying capacity. Conservative stocking rates protect fragile desert grassland from irreversible conversion to creosote shrubland. The Trans-Pecos's large-acreage requirements reflect the scale of the landscape: 40 to 80 minimum acres, 5% brush management, and annual census counts under 34 TAC Section 9.2002. Primary targets are mule deer, pronghorn, and desert bighorn sheep. Management prescriptions emphasize maintaining large, connected tracts of native rangeland with minimal fencing.
These are the intensity thresholds your plan must meet for the Trans-Pecos ecoregion. Your county appraisal district will verify compliance against these minimums. A plan that does not address them risks denial of your wildlife management valuation. For a complete overview of the seven management pillars, see the management pillars guide.
This is a hard minimum. The appraisal district will verify that your plan prescribes brush management on at least this proportion of your acreage annually.
Food plots must provide nutritional supplementation for target species. The minimum size and density are set by ecoregion to reflect carrying capacity.
Feeder placement and protein content are auditable. The aflatoxin threshold (20 ppb) is a compliance requirement, not a suggestion.
Fire ant suppression directly supports native harvester ant populations, the primary food source for Texas horned lizard and other ground-foraging species.
Brown-headed cowbirds are brood parasites that reduce nesting success of songbirds. The minimum applies to properties where cowbird trapping is selected as a management activity.
The burn rotation percentage applies over the full plan period. Properties that cannot burn due to WUI constraints must document the limitation and substitute equivalent mechanical treatment.
Nest box density is based on territory size of target cavity-nesting species. Boxes must be monitored and maintained annually.
Source: TPWD 34 TAC Section 9.2002, Comprehensive Wildlife Management Planning Guidelines
Water Resources
3 Groundwater Conservation Districts regulate water resources in the county, with permitting requirements for new wells and production limits that affect agricultural and wildlife management water sources.
Conservation Infrastructure
Big Bend Ranch State Park and Davis Mountains State Park and Fort Leaton State Historic Site anchor the conservation landscape in Presidio County, providing protected Trans-Pecos habitat and reference conditions for adjacent private land management.
Infrastructure
Oil and gas activity in Presidio County is limited: 456 wells and 18 pipeline segments on record.
3855 square miles of desert rangeland, 144 documented species, and rainfall measured in single digits. In Presidio County, water is the management plan.
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144 documented species. 7 federal listings. The management plan for Presidio County land has to be specific. Built for Trans-Pecos. Ready to file.
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