The Cerulean warbler is a songbird that breeds in the eastern and middle United States and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reason(s) for this rapid decline and set about to make observations and gather data. The graph above shows data you collected on the abundance of Brown cowbirds (nest parasites) and Cerulean warblers at various locations. Based on a visual inspection of the graph, what can you conclude?
A. Brown cowbird abundance is significantly correlated with Cerulean warbler abundance.
B. The abundance of Brown cowbirds shows a positive relationship with Cerulean warbler abundance.
C. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance.
D. Brown cowbirds do not appear to affect Cerulean warblers.
E. Brown cowbirds are responsible for the decline of the Cerulean warbler.
Answer: C
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