{'fraction_non_alphanumeric': 0.02328589909443726, 'fraction_numerical': 0.00517464424320828, 'mean_word_length': 5.445833333333334, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Mitochondrial DNA Variation in the Northern Flicker ( Colaptes auratus , Aves ) 1

The northern flicker is a common woodpecker that inhabits open woodlands throughout North America. A narrow hybrid zone occurs along the range boundaries between the eastern yellow-shafted and western red-shafted subspecies. Mitochondrial DNA (mtDNA) was isolated from 20 1 flickers from 27 locales, primarily along two transects that cross the hybrid zone, one across the northern United States and one across the southern United States. Analysis of restriction-fragment patterns revealed substantial mtDNA polymorphism. Three restriction endonucleases--HindHI, PvuII, and AvaI--together define eight haplotypes. Geographic variation in haplotype frequencies is highly significant. UPGMA analysis of haplotype frequencies reveals two major clusters of populations, a northern-and-eastern cluster and a southwestern cluster; 86% of the variance in haplotype frequency occurs between the two clusters. Geographic variation in haplotype frequencies is not clearly associated with the hybrid zone. This pattern of divergence may reflect a history of isolation of southwestern populations; alternatively, it is possible that the group of related southwestern haplotypes is adapted to hot, arid conditions common in the deserts of the American Southwest. The gilded flicker is a third subspecies that occurs in the Sonoran Desert. Gilded flickers from Arizona have an mtDNA haplotype closely related to the haplotypes observed in red-shafted flickers of the Southwest.