Journal
GLOBAL CHANGE BIOLOGY
Volume 9, Issue 5, Pages 785-790Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-2486.2003.00621.x
Keywords
butterfly; climate; El Nino; PDO; population; Vanessa cardui
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Annual 4th of July Butterfly Count data spanning more than 20 years are examined to explore Vanessa cardui (Painted Lady) population fluctuations with ENSO (El Nino) and Pacific Decadal Oscillation (PDO) indices. California, Colorado and Nebraska censuses exhibit a strong positive correlation with the strong El Nino events of 1982-1983 and 1997-1998 and the weaker event of 1991-1992. Regression analysis shows the population fluctuations are strongly coupled to climate variations on both short (El Nino) and longer (Pacific Decadal Oscillation) time scales. Recognizing the sensitivity to these time scales is important for predicting longer-term global climate change effects.
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