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Figure 6 | BMC Evolutionary Biology

Figure 6

From: Strong reproductive barriers in a narrow hybrid zone of West-Mediterranean green toads (Bufo viridissubgroup) with Plio-Pleistocene divergence

Figure 6

Backcrosses of F 1 ( B. balearicus × B. siculus , Fig. 6a) to parental species of Sicilian green toads. a-d: Wild-caught animals involved in backcrosses. a: B. balearicus female; b: B. balearicus male; c: B. siculus female; d: B. siculus male. e-h: Backcrosses. e: female F1 (B. balearicus × B. siculus) × male B. balearicus; f: female B. balearicus × male F1 (B. balearicus × B. siculus); g: female F1 (B. balearicus × B. siculus) × male B. siculus; female B. siculus × male F1 (B. balearicus × B. siculus). Photographs: a-d: G.F. Turrisi; e-h: M. Stöck.

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