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Post Oak Savannah Ecoregion
Wildlife Management Plan for Robertson County, Texas
Robertson County sits at the convergence of 4 Texas ecoregions, with 81 documented wildlife species.
Intelligence Snapshot
Regulatory Complexity
Robertson County's conservation obligations require careful attention to how management practices affect listed species habitat. The 7 endangered species documented here mean that brush clearing, water development, and land use changes carry ESA compliance risk. The county spans 4 ecoregions. A plan written for the wrong landscape position could prescribe inappropriate intensity standards or target the wrong species assemblage. A properly calibrated plan accounts for these constraints. A generic plan does not.
Robertson County Ecological Profile
Robertson County's 855 square miles of open post oak woodlands with native grass understory carry an environmental legacy: 28 orphan wells on the Railroad Commission's plugging priority list alongside active ecological management. The region has been significantly altered by decades of grazing, fire suppression, and conversion to improved pasture, but intact remnants retain high ecological value. The intersection of 4 ecoregions creates a convergence zone where species from multiple regions overlap. This ecological complexity means no single management template applies countywide.
Wildlife management in the Post Oak Savannah focuses on restoring the open, park-like woodland structure that historically characterized the region. Eastern red cedar removal through mechanical cutting and prescribed fire is the primary management action, followed by restoration of native grass and forb understory beneath retained post oak canopy. Riparian corridors along the sandy creeks of the region provide critical travel corridors for wildlife and should be protected from intensive grazing. Food plots of native warm-season grasses supplemented with iron clay cowpeas and grain sorghum provide supplemental nutrition for white-tailed deer and wild turkey during stress periods.
Transitional Ecoregion
Robertson County intersects 4 distinct ecoregions: Cross Timbers, East Central Texas Plains, South Central Plains, and Texas Blackland Prairies. This is not a minor detail. A plan calibrated to the Cross Timbers would prescribe the wrong intensity standards, the wrong target species, and the wrong management timeline for a property in the Texas Blackland Prairies zone. Property-specific ecoregion classification is the first step in any credible plan.
Soil Conditions
Soils are predominantly deep, sandy loams of the Padina, Silstid, and Demona series, with scattered areas of heavy clay in bottomlands. The sandy upland soils are drought-prone but support excellent native grass production when properly managed.
Fire Ecology
The Post Oak Savannah evolved with fire at 2 to 5 year intervals. Prescribed burning is essential for maintaining the open woodland structure and controlling the eastern red cedar invasion that has dramatically altered the region over the past century.
Spans 4 ecoregions: Cross Timbers, East Central Texas Plains, South Central Plains, Texas Blackland Prairies
White-tailed deer, eastern wild turkey, and northern bobwhite are the primary management targets. The region provides important habitat for neotropical migratory songbirds, including painted bunting, summer tanager, and yellow-billed cuckoo, that nest in the oak woodland canopy. Texas horned lizard persists in areas with sandy soils and active harvester ant colonies. Eastern bluebird benefits from nest box programs in areas where natural cavity trees have been removed.
Robertson County Species of Conservation Concern
TPWD records 81 species in Robertson County. Birds represent the most documented group at 28 species. The county carries significant conservation obligations: 7 federally endangered species, 5 federally threatened, and USFWS critical habitat designations for 2 species. Management activities on private land must be designed to avoid incidental take. Federally listed species include Houston toad, whooping crane, and smalleye shiner. Houston toad: Endemic to sandy soils in the Post Oak Savannah.
Primary Management Targets
white-tailed deer, bobwhite quail, eastern bluebird
Listed Species
Endemic to sandy soils in the Post Oak Savannah. Land clearing, road construction, and groundwater withdrawal in Bastrop and surrounding counties require ESA consultation. Lost Pines habitat is critical.
Winters along the Texas coast at Aransas NWR and surrounding marshes. Grain field management and wetland water levels in coastal counties affect foraging habitat. Disturbance within 1,000 feet of roosting sites is regulated.
Endemic to the upper Brazos River system. Reservoir construction and flow alteration are primary threats. Maintaining natural flow regimes benefits this species.
Freshwater mussel endemic to the Edwards Plateau region. Found in spring-influenced stream reaches. Water quality and flow maintenance are primary management considerations.
Freshwater mussel in central Texas rivers including the Guadalupe and Colorado systems. Impoundment, sedimentation, and water quality degradation threaten habitat.
Found in Post Oak Savannah grasslands on sandy soils. Native grassland maintenance and prescribed fire support habitat. Mowing timing must avoid the fall flowering period.
Found in sandy prairies in South Texas. Agricultural conversion and herbicide use are primary threats.
Inhabits dense emergent marsh vegetation. Extremely secretive and declining. Wetland drainage, mowing of marsh vegetation during nesting season, and altered hydrology are primary threats. Marsh management must maintain dense low vegetation.
Nests on bare sand and shell flats along the Gulf Coast. Coastal properties must avoid disturbance to nesting areas during breeding season (March through August). Vehicle traffic on beaches in occupied habitat is restricted.
Migrates through Texas coastal beaches in spring and fall. Depends on horseshoe crab eggs and invertebrates on tidal flats. Beach disturbance during migration windows (April through May, September through November) should be minimized.
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.
Freshwater mussel found in central and East Texas rivers. Sensitive to sedimentation, flow alteration, and water quality changes. Maintaining riparian vegetation and minimizing erosion are key management practices.
Endemic to sandy soils in the Post Oak Savannah. Land clearing, road construction, and groundwater withdrawal in Bastrop and surrounding counties require ESA consultation. Lost Pines habitat is critical.
Inhabits dense emergent marsh vegetation. Extremely secretive and declining. Wetland drainage, mowing of marsh vegetation during nesting season, and altered hydrology are primary threats. Marsh management must maintain dense low vegetation.
Nests on bare sand and gravel bars along rivers and reservoirs. Disturbance during nesting season (May through August) must be avoided. Water level management at reservoirs affects nesting success.
Nests on bare sand and shell flats along the Gulf Coast. Coastal properties must avoid disturbance to nesting areas during breeding season (March through August). Vehicle traffic on beaches in occupied habitat is restricted.
Migrates through Texas coastal beaches in spring and fall. Depends on horseshoe crab eggs and invertebrates on tidal flats. Beach disturbance during migration windows (April through May, September through November) should be minimized.
Winters along the Texas coast at Aransas NWR and surrounding marshes. Grain field management and wetland water levels in coastal counties affect foraging habitat. Disturbance within 1,000 feet of roosting sites is regulated.
Endemic to the upper Brazos River system. Reservoir construction and flow alteration are primary threats. Maintaining natural flow regimes benefits this species.
Freshwater mussel endemic to the Edwards Plateau region. Found in spring-influenced stream reaches. Water quality and flow maintenance are primary management considerations.
Freshwater mussel found in central and East Texas rivers. Sensitive to sedimentation, flow alteration, and water quality changes. Maintaining riparian vegetation and minimizing erosion are key management practices.
Freshwater mussel in central Texas rivers including the Guadalupe and Colorado systems. Impoundment, sedimentation, and water quality degradation threaten habitat.
Found in Post Oak Savannah grasslands on sandy soils. Native grassland maintenance and prescribed fire support habitat. Mowing timing must avoid the fall flowering period.
Found in sandy prairies in South Texas. Agricultural conversion and herbicide use are primary 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
Post Oak Savannah Wildlife Management Standards
Management in Robertson County means restoring the open, park-like post oak woodland that fire historically maintained. Cedar removal and native grass restoration beneath retained oaks are the primary actions. Because the county spans 4 ecoregions, the applicable intensity standards depend on where the property sits. For the Post Oak Savannah portion, TPWD requires 15 to 20 minimum acres, 20% brush management, and annual census documentation (34 TAC Section 9.2002). Primary targets are white-tailed deer, bobwhite quail, and eastern bluebird. Practice recommendations should reflect each property's specific landscape position within the county.
These are the intensity thresholds your plan must meet for the Post Oak Savannah 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
5 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.
Infrastructure
The Railroad Commission documents 4,793 wells and 3,806 pipeline segments in Robertson County, a moderate industrial presence alongside agricultural land use. 28 orphan wells are on the Railroad Commission's plugging priority list.
4 ecoregions. 7 endangered species. Robertson County's complexity is the plan's first constraint.
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12 federally listed species. Critical conservation obligations. Robertson County requires a plan calibrated to its specific regulatory landscape. TPWD-compliant. Same-day delivery.
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