Numerical response of wintering waterfowl to macrohabitat in the southern High Plains of Texas

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Title: Numerical response of wintering waterfowl to macrohabitat in the southern High Plains of Texas
Author: Obenberger, Susan M
Abstract: Populations of pintails (Anas acuta ) , American wigeon (A . americana ) , mallards (A . platyrhynchos ) , and green -winged teal ( _A . crecca ) were studied on 10 23 .04 -km^2 plots in the Southern High Plains of Texas during September -March 1980 -1981 and 1981 -1982 . Peak total populations occurred in November and February , largely because of massive influxes of pintails during these months . Mallard and wigeon populations were relatively stable after peak numbers arrived on the wintering areas and before spring migration . Sex ratios observed in this study were similar to those reported in other portions of the Southern High Plains . The estimated percentage of males was similar (P >0 .05 ) each month during October -March for mallards and wigeon but was lower (P _ < 0 .05 ) in December 1981 (58 % ) than in January 1982 (70 % ) for pintails and in October -November 1980 (47 -49 % ) than in December -March 1980 -1981 (72 -80 % ) for green -winged teal . Availability of waste corn in disced fields was relatively constant throughout the winter because as fields were plowed the stubble in other fields was disced . Less than 3 % of the corn stubble was burned . Multiple regression models that predicted monthly waterfowl use of plots based on hectares of macrohabitat were acceptable for total ducks , wigeon , and pintails but were not acceptable for mallards and green -winged teal . Hectares of water , corn , and wheat positively affected waterfowl use whereas hectares of sorghum , cotton , and other land uses negatively affected waterfowl use . The models can be used to determine the most effective and cost -efficient management measures to increase or decrease waterfowl populations on wintering areas in the Southern High Plains of Texas .
URI: http : / /hdl .handle .net /2346 /21721
Date: 1982-12

Citation

Numerical response of wintering waterfowl to macrohabitat in the southern High Plains of Texas. Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /21721 .

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