ILLUSTRATED FLORA OF EAST TEXAS - Brit - Botanical Research ...
ILLUSTRATED FLORA OF EAST TEXAS - Brit - Botanical Research ...
ILLUSTRATED FLORA OF EAST TEXAS - Brit - Botanical Research ...
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140 INTRODUCTION/PRESETTLEMENT AND EARLY SETTLEMENT CONDITIONS ON BLACKLAND PRAIRIE<br />
Strecker (1926a) also reported the wild horse as abundant throughout the Brazos Valley of<br />
McLennan County at the time of arrival of the first American settlers. He further indicated<br />
that early settlers sometimes shot the wild horses to prevent interference with their domesticated<br />
stock.<br />
One mammal often associated with grasslands, the black-tailed prairie dog, did not occur<br />
in the vast majority of the Blackland Prairie. Prairie dogs “typically inhabit short-grass<br />
prairies; they usually avoid areas of heavy brush and tall grass, possibly because visibility is<br />
considerably reduced” (Davis & Schmidly 1997). While occurring primarily in the western<br />
half of the state, they did extend east as far as the southwestern margin of East Texas, reaching<br />
Bexar and Hays counties (Davis & Schmidly 1997). Because of perceived competition with<br />
livestock and farming interests and injury to ranch animals stepping in their holes, prairie<br />
dogs have been eliminated from most of their former habitats. However, “the desirability of<br />
eliminating them entirely from rangelands has not been satisfactorily demonstrated.<br />
Stockmen in certain parts of Texas, for example, claim that removal of prairie dogs has had<br />
some direct association with the undesirable spread of brush. This has had detrimental effects<br />
on the livestock industry which far outweighs the damage prairie dogs might do” (Davis &<br />
Schmidly 1997).<br />
Early surveyor records (as far back as the 1830s) of mesquite as the most common tree<br />
in presettlement upland prairies in Navarro County suggest “…the legendary spread of<br />
mesquite into North Texas by longhorn cattle may be an errant concept” (Jurney 1987).<br />
Roemer’s (1849) mention of “extensive prairies covered with mesquite trees” also points to<br />
mesquite as a natural component of the vegetation. Likewise, early Spanish expedition diaries<br />
(e.g., Fray Isidro de Espinosa noted mesquite in Williamson County in 1716—Foster 1995),<br />
point to its widespread natural occurrence in the state. However, mesquite undoubtedly<br />
has increased in many areas, and the observations mentioned above are not so early as to<br />
preclude it having already been spread to some extent by land use changes.<br />
While some question the degree to which mesquite was spread by longhorns, animals<br />
have had profound impacts on the vegetation since long before settlement. These range<br />
from the obvious effects of the bison and beaver to the more subtle but essential roles of<br />
pollination and seed dispersal.<br />
The bird, reptile, and fish faunas of presettlement times were also conspicuously different<br />
in significant ways from those of today. Brooke (1848), writing about early Grayson County,<br />
mentioned both wild turkeys and prairie chickens, and Smythe (1852) spoke of hunting<br />
“Prairie Hens” in what is now Limestone County on the eastern edge of the Blackland<br />
Prairie. According to Pulich (1988), greater prairie chickens were common in the area until<br />
the 1880s, and lesser prairie chickens, while generally found to the west of East Texas, were<br />
also possibly present in the area. Oberholser (1974) lists specimen records for the greater<br />
prairie chicken from Dallas, Milam, and Navarro counties, with a number of other sight<br />
records from the area. There is a questionable record for the lesser prairie chicken from Dallas<br />
and other records for this species from Cooke and Young counties to the west of the<br />
Blacklands (Oberholser 1974). Both of these species were locally extinct by the early 1900s,<br />
presumably due to overhunting and habitat destruction. The extinct passenger pigeon is also<br />
well-documented for the Blackland Prairie. These birds, known as “wild pigeons” by early<br />
settlers, were recorded from Bexar, Collin, Dallas, Fannin, Grayson, Henderson, Hunt, and<br />
Travis counties, with a number of records even farther west in the Grand Prairie, Lampasas<br />
Cut Plain, and West Cross Timbers (Oberholser 1974; Pulich 1988; Casto 2001). This once<br />
incredibly numerous species rapidly became extinct in the Blackland Prairie region, with<br />
1896 being the last year one was recorded in the area (Van Zandt County) (Oberholser<br />
1974; Pulich 1988). The ivory-billed, one of the world’s largest woodpecker species and<br />
now presumably extinct, was also present in bottomland forests in the Blacklands.<br />
Oberholser (1974) listed records for Cooke, Dallas, Fannin, and Kaufman counties, with