| http://www.w3.org/ns/prov#value | - However, hybridization between Mexican spadefoot toads and plains spadefoot toads is well known (H.A. Brown, 1976a; Sattler, 1985); in some areas, such as the San Simon Valley, Arizona, high frequencies of F1 hybrids and backcross progeny occur, with hybrid adults representing up to 31% of the breeding congress at some pools (Simovich et al., 1991; Simovich, 1994).
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