Global Short Term Trend: Decline of 10-30%
Comments: Christmas Bird Count data for the United States in the 1990s show an increase in the early part of the decade followed by a substantial decline, resulting in little or no change from the beginning of the decade (National Audubon Society 2002).
Global Long Term Trend: Decline of 10-90%
Comments: Nearly extirpated throughout range between late 1800's and mid-1930's. Gradual increase following legal protection. Population in Florida Bay, Florida, recovered from total extirpation in 1935 to 200-250 adults in late 1970's. Population changed little by 1980s (Powell et al. 1989). Christmas Bird Count data shows nonsignificant decline survey-wide (-0.2 % annual change; N = 81) for 1959-1988. Significant (p < 0.10) decline in Texas, however, (-2.2 % annual change; N = 26) and significant (p < 0.10) increase in Florida (2.3 % annual change; N = 39) the same period (Sauer et al. 1996).