Fig. 2From: Patterns of introgression vary within an avian hybrid zoneGenetic composition (hybrid index (HI)/interspecific heterozygosity) in the center of the Saltmarsh-Nelsonās hybrid zone. The bottom panel shows the distribution of genetic composition for all nestling and adult birds, and the upper two panels show the distributions by sex. Colored circles indicate the corresponding genotypic class for the combination of HI and interspecific heterozygosity as follows: dark blueā=āpure Nelsonās Sparrows, light blueā=ābackcrossed Nelsonās Sparrows, grayā=ārecent generation hybrids, yellowā=ābackcrossed Saltmarsh Sparrows, and orangeā=āpure Saltmarsh Sparrows. Percentages represent the frequency of each genotypic class within the respective frameBack to article page