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Predictable Interregional Movements by Female Northern Pintails During Winter


Table 1.  Synoptic weather types used by Louisiana Office of State Climatology.
Weather type Characteristics1
Pacific High Fair, mild, and dry; winds west to northwest
Continental High Fair, cold, and dry; winds north to northwest
Coastal Return Fair and mild; winds northeast, east, or southeast
Gulf High High barometric pressure; maritime tropical air; winds southwest
Gulf Return Cold front approaching, but too far away to affect weather yet; variable cloudiness and becoming warm; winds east, southeast, or south
Frontal Gulf Return2 Turbulent and stormy as cold front approaches; winds typically southwest
Frontal Overrunning2 Cloudy and rainy conditions associated with a cold front that has become stationary; winds northeast
Gulf Tropical Disturbance2 Stormy, turbulent weather associated with approaching tropical depressions or hurricanes
1 See Muller and Willis (1983) for complete descriptions.
2 Classified as stormy for analysis; remainder classified as fair.


Table 2.  Daily emigration probabilities and 95% confidence intervals for female Northern Pintails captured and radiotagged in southwestern Louisiana in relation to weather for each winter.
Winter Weather Probability 95% confidence interval
1990-1991 Stormy 0.0035 0.0014-0.0086
Fair 0.0005 0.0001-0.0037
1991-1992 Stormy 0.0049 0.0022-0.0108
Fair 0.0033 0.0020-0.0054
1992-1993 Stormy 0.0024 0.0011-0.0055
Fair 0.0086 0.0060-0.0122


Table 3.  Daily emigration probabilities and 95% confidence intervals in relation to time period and weather for female Northern Pintails captured and radiotagged in southwestern Louisiana during winters 1990-1991 through 1992-1993.
Time period1 Weather Probability 95% confidence interval
PRE Stormy 0.0003 0.0001-0.0022
Fair 0.0019 0.0010-0.0035
FHUNT Stormy 0.0282 0.0217-0.0367
Fair 0.0118 0.0076-0.0183
SPLIT Stormy 0.0078 0.0050-0.0121
Fair 0.0046 0.0020-0.0107
SHUNT Stormy 0.0227 0.0153-0.0335
Fair 0.0204 0.0109-0.0379
POST Stormy 0.0147 0.0105-0.0207
Fair 0.0039 0.0019-0.0081
1 PRE = pre-hunting season; FHUNT = first hunting season; SPLIT = time between hunting seasons; SHUNT = second hunting season; POST = post-hunting season.


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