Life Sciences Commons^™

The Genus Urochloa (Poaceae: Paniceae) In Texas, Including One Previously Unreported Species For The State, J. K. Wipff, Robert I. Lonard, Stanley D. Jones, Stephan L. Hatch

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Urochloa is represented in Texas by three species, U. mosambicensis, U. panicoides, and U. reptans. Urochloa mosambicensis is being reported new for Texas. Urochloa panicoides has recently been reported in the state and is listed in the Federal Noxious Weed Act. Urochloa reptans has been recognized in Texas and the U. S. as Panicum reptans or, more recently, Brachiaria reptans. A key to distinguish related genera, a key to the species of Urochloa in Texas, species descriptions, and their distribution in Texas are provided.

-

Urochloa está representada en Texas por tres especies, U. mosambicensis, U. panicoides y U. reptans. …

Agriculture News Release - 1992-12-24, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1992-12-08, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1992-05-06, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Development Of Mass-Rearing Techniques For Aphelinus Asychis Walker For Use In A Biological Control Program Against Russian Wheat Aphid, Robin Lynn Whitaker-Deerberg

Theses and Dissertations - UTB/UTPA

Mass-rearing techniques were developed for the parasitoid Aphelinus asychis Walker (Hymenoptera:Aphelinidae) for use in a biological control program against the Russian wheat aphid, Diuraphis noxia (Mordvilko) (Homoptera:Aphididae). Daily ovipositional activity, host-feeding behavior, effects of population density in the rearing cages and effects of cold storage on mummies were determined.

Daily ovipositional activity peaked at day 5 after emergence of the parasitoid. Ninety-two percent of mummies resulting from ovipositional activity were oviposited the first 13 days of the parasitoid’s life. Since mummification occurred 11 days after oviposition and emergence occurred 11 days after mummification, day 24 was determined to be the …

Historical Changes In The Ichthyofauna Of The Lower Rio Grande (Río Bravo Del Norte), Texas And Mexico, Robert J. Edwards, Salvador Contreras-Balderas

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

CT-Collections of fishes from the lower Rio Grande (Rio Bravo del Norte) during the past 138 years suggest two indigenous faunal assemblages. One fauna is upstream, composed of mostly freshwater species, and the other is a downstream assemblage composed of a mixture of the more abundant upstream elements and more estuarine species. Recent collections in the lower Rio Grande indicate that major alterations in these fish communities have occurred. The upstream fauna has lost many of its characteristic freshwater components; native freshwater species have been replaced by exotic (=non-native) or estuarine forms. The downstream fauna has many fewer freshwater taxa …

Comparison Of The Effects Of The Severe Freezes Of 1983 And 1989 On Native Woody Plants In The Lower Rio Grande Valley, Texas, Robert I. Lonard, Frank W. Judd

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Freeze damage to native woody plants was assessed at the same four sites in the lower Rio Grande Valley, Texas, in 1983 and 1989. The number of severely damaged species was greater in 1989 possibly because temperatures in 1989 were lower and longer in duration below freezing versus 1983. Thirty0five species (48.6%) had the same damage index value for the two freezes, and 24 (33.3%) species showed no damage in either year. More than half of the 72 species analyzed (55.5% in 1983 and 51.3% in 1989) showed no damage or only leaf damage, indicating most of the native woody …

Notes On The Vegetation And Flora Of North Padre Island, Texas, E. Glenn Carls, Robert I. Lonard, Dennis B. Fenn

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

No abstract provided.

Woody Plants Of The Lower Rio Grande Valley, Texas, Robert I. Lonard, James H. Everitt, Frank W. Judd

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Description of Common Vegetation of Lower Rio Grande Valley.

Agriculture News Release - 1990-12-21, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1990-11-21, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1990-09-26, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1990-05-25, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1990-03-22, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1990-02-08, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1990-01-12, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1989-08-07, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1989-08-04, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Agriculture News Release - 1989-05-25, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Seasonal Distribution Of The Ichthyofauna Of Santa Ana National Wildlife Refuge, Alamo, Texas, Matthew Albert Ciomperlik

Theses and Dissertations - UTB/UTPA

This study investigated the small aquatic ecosystems of Santa Ana National Wildlife Refuge, located in a predominantly agricultural area of the Lower Rio Grande Valley, Texas. Fishes and water quality data were collected for 13 months to determine the status of fish populations and the factors which influence their distributions on the refuge.

Sixteen fish species were collected during the study, however, more than 20 species are known to inhabit the Rio Grande in the vicinity of the refuge. Water source played a major role in influencing fish species richness in these aquatic ecosystems. Diverted river water offered the best …

Agriculture News Release - 1988-09-28, United States. Congress. House. Committee On Agriculture, E. De La Garza

Kika de la Garza Congressional Papers - Agriculture Committee News Releases

No abstract provided.

Esenbeckia Berlandieri (Rutaceae) Rediscovered In Extreme Southern Texas, Michael R. Heep, Robert I. Lonard

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

No abstract provided.

Propagation Of Two Southern Texas Shrubs By Stem Cuttings, Michael R. Heep, Robin S. Vora

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

We successfully used stem cuttings to propagate two native shrubs, brush holly (Xylosma flexuosa) and devil's claw. (Pisonia aculeata), which are rare in the Rio Grande floodplain of southern Texas. Roots grew on 100 percent of the cuttings that did not receive root-promoting substances. Rooting success decreased when synthetic root promoting substances or a nutrient solution was used. Key words: asexual propagation; native shrubs.

Sea Urchins From The Brazos Santiago Pass Jetty, South Padre Island, Richard R. Fairchild, Lazern O. Sorensen

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Data on occurrence and distribution of sea urchins (Echinoidea) are presented for the Brazos Santiago Pass jetty on South Padre Island, Texas. Echinometra lucunter is recorded from the Texas coast.

Factors Influencing Cellulolytic Activity Of The Soil Fungus, Aspergillus Candidus, Jacobo Ortega, Ernest J. Baca

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Effects of pH, incubation time, nitrogen source and carbohydrate source upon production of carboxymethyl cellulase by Aspergillus candidus grown in liquid medium were studied. Maximal cellulase activity per unit of protein occurred in culture fluids with a pH of 5.5, after 10 days of cultivation of the fungus. Ammonium nitrate supported the highest production of the enzyme. However, in the nitrogen-source test, highest accumulation of extracellular protein was found in fluids from cultures with urea as the nitrogen source. Cotton fibers produced the greatest gain in cellulase activity when the carbohydrate source was incremented from 0.5 to 1.0 percent. The …

Effects Of A Severe Freeze On Native Woody Plants In The Lower Rio Grande Valley, Texas, Robert I. Lonard, Frank W. Judd

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

The effects of a severe freeze in December, 1983 on the native plants of the lower Rio Grande Valley, Texas were determined for 75 species. Damage was initially assessed by examining leaves, apical meristems, and cambial tissues of stems. Initial assessments were confirmed by surveys in the spring when new leaves were present. Forty-three species were either undamaged or had only minor leaf damage. Twenty-two species with damaged leaves had intact apical meristems or showed evidence of damage for less than 10 cm below the apical meristem. Three species, Leucaena pulverulenta, Cordia boissieri, and Karwinskia humboldtiana, had more extensive damage, …

The Effect Of Hurricane Allen On The Near-Shore Vegetation Of South Padre Island, Frank W. Judd, Sammie L. Sides

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

The effect of Hurricane Allen (Aug. 10, 1980) on the near-shore vegetation of South Padre Island was assessed by comparing data obtained in line transects before and after the hurricane. Eight species of plants were present in the Backshore Zone prior to the hurricane; after the hurricane, only three species were present and percent cover was only 11% of that before the hurricane. The foredunes of this zone were completely leveled and a belt of Sesuvium portulacastrum was obliterated. Conversely, plants of the taller Primary Dune Zone were not greatly disturbed by the hurricane. Numbers of species and percent cover …

Habitat Selection Related To Resource Availability Among Cavity-Nesting Birds, Timothy Brush

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Variation in snag species and abundance appeared to explain most of the habitat selection patterns observed in five cavity-nesting riparian species over a three-year period. All species except Ash-throated Flycatchers were most common in areas with cottonwood or willow snags, which have relatively soft wood and are preferred nest sites. Classification of habitats on the basis of nest-site characteristics was useful and should be considered in other habitat selection studies.

Population Structure, Density And Movements Of The Texas Tortoise Gopherus Berlandieri, Frank W. Judd, Francis L. Rose

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

Gopherus berlandieri was studied on a 3.3 ha grid in Cameron Co., Texas for five years. One hundred two tortoises were marked (43 males, 30 females, 26 juv., and 3 adults whose sex was not determined). Numbers of males and females did not differ significantly. Juveniles comprised 27% to 9% of the population and maximum population density was 15 to 16 tortoises per ha. The number of females remained constant, but males and juveniles declined gradually from 1972 to 1975, then markedly in 1976. The percentage of shared individuals in successive years was higher for females than males, but only …

The Mexicans' And Mexican-Americans' Contribution To The Development Of The Lower Rio Grande Valley Of Texas And Its Citrus Industry, Camilo A. Martinez Jr.

Theses and Dissertations - UTB/UTPA

The little-discussed Mexican and Mexican-American contribution to the development of the Lower Rio Grande Valley of Texas into the great citrus producing area that it is today is exposed in general terms in this thesis. Due credit has been given to the Burgos, Tamaulipas, residents who came to the Valley during and after the Mexican Revolution in search of stability and better wages. In spite of the abuses they suffered, some of them decided to stay. Their children (now Mexican-Americans), are still contributing to the citrus industry today, although not in the strenuous way their parents did.

The Valley owes …