Parent C.J.,Michigan State University |
Hernandez F.,Caesar Kleberg Wildlife Research InstituteTexas iversity KingsvilleKingsville78363 |
Brennan L.A.,Caesar Kleberg Wildlife Research InstituteTexas iversity KingsvilleKingsville78363 |
Wester D.B.,Caesar Kleberg Wildlife Research InstituteTexas iversity KingsvilleKingsville78363 |
And 2 more authors.
Journal of Wildlife Management | Year: 2015
Northern bobwhite (Colinus virginianus) populations have declined across their range. The decline is associated with broad-scale losses of their habitats. Additionally, the presence of essential, structural features provided by vegetation in the remaining habitats is contingent on variable spatial and temporal trends in precipitation. This complicates the management of the bobwhite's habitats. We modeled counts of bobwhite coveys as a function of landscape structure and precipitation covariates from arid landscapes in southern Texas. Our results indicated that numbers of coveys in landscapes with greater amounts of woody cover were predicted to be highly independent of precipitation. This has important management implications because certain landscape structures associated with woody cover buffer bobwhite populations from drought. To facilitate management based on our results, we mapped our model predictions for covey counts. This allows managers to spatially prioritize where management interventions need to occur, and evaluate the potential efficacy for these interventions to create positive bobwhite population responses. © The Wildlife Society, 2015.
Aguiar A.D.,Texas A&M University |
Tedeschi L.O.,Texas A&M University |
Rouquette F.M.,Texas AgriLife Research Center |
McCuistion K.,Texas A&M University-Kingsville |
And 4 more authors.
Grass and Forage Science | Year: 2011
The objectives of this study were to use the in vitro gas production (IVGP) technique to evaluate the pattern and parameters of anaerobic fermentation of forages from south Texas pastures throughout the year to (i) obtain empirical relationships between the IVGP technique fermentation parameters and chemical composition of the forages and (ii) develop equations to compute total digestible nutrients (TDN). During four consecutive years (2006-2009), forage samples were collected monthly (n=39) at the King Ranch, TX, and chemical analyses and IVGP were obtained. For 2006, 2007, 2008 and 2009, the average lag times, h, were 6·47±0·54, 7·75±0·65, 7·49±2·01 and 5·44±1·46, and the average ratio of millilitre of gas per milligram of dry matter was 0·41±0·11, 0·34±0·09, 0·34±0·07 and 0·26±0·10 respectively. There was a moderate negative correlation (r=-0·53) between lignin and neutral detergent fibre (NDF) and a moderate positive correlation (r=0·58) between crude protein and NDF digestibility. The predicted fractional passage rate (kp) by the large ruminant nutrition system model using the level 2 solution was on average 0·0366 h-1. The average computed TDN assuming a kp of 0·04h-1 was 55·9%. We concluded the IVGP technique may be used to predict TDN values of warm-season forages. © 2011 Blackwell Publishing Ltd.
Cherry R.,Everglades Research and Education Center |
Grose P.,King Ranch |
Barbieri E.,King Ranch
Journal of Pest Science | Year: 2013
Wireworms in Florida are primarily a pest in newly planted sugarcane, and growers usually apply a soil insecticide at planting to protect germinating seedpieces from wireworm damage. However, studies have suggested that this application in many cases may not be necessary. The objective of this research was to test a sequential sampling method to determine the need for soil insecticide at sugarcane planting. Testing was conducted on fields located on King Ranch near South Bay, Florida. Wireworm samples were taken in a transect across the length of each field. We used an economic injury level of nine or more wireworms per 25 samples. Sugarcane yield parameters for each whole field were obtained through standard commercial harvesting procedures. Using our sampling method, 38 fields were judged as not needing insecticide application. There was no significant difference in yield in these fields with versus those without insecticide application. © 2011 Springer-Verlag.