Figure 1.

The number of papers on North American conservation translocations published annually from 1974 to 2013: (a) papers that involved captive breeding relative to all conservation translocation relevant papers in the North American Conservation Translocation (NACT) database, (b) papers that mentioned captive breeding by zoos relative to papers involving any captive breeding, (c) papers authored by zoo employees relative to papers with no authors involved with zoos, and (d) trend in proportions of NACT captive breeding, captive breeding by zoos, and authorship of researchers associated with zoos.