Appalachian Trechus of the vandykei Group 
139 
Fig. 1. Map of the Unaka mountain region, showing locations of Trechus 
vandykei species-group populations examined in this study. Subgroup designa- 
tions of populations are as follows: bowlingi — CG Collins Gap, HE Heintooga 
Overlook; RC Ramsay Cascades, WP Walker Prong; haoe — HA Haoe Lead; 
pisgahensis — BG Beech Gap, BP Bearpen Gap, DG Deep Gap, MP Mount 
Pisgah, SM Sandymush Bald, WH Whiteside Mountain; tusquitee — CH Cheoah 
Bald, TU Tusquitee Bald; vandykei — BA Balsam Gap, BB Big Bald, CC Camp 
Creek Bald, MM Mount Mitchell, SN Snowball Mountain, UN Unaka Mountain. 
Six of the eight loci examined were monomorphic, with the same 
electromorph fixed in all populations of all taxa examined (Table 2). 
The remaining two loci, CAH and PGI (Table 2, part B), were variable 
within and/or between populations. Four of the five subgroups showed 
very similar patterns of genetic variability (Table 3), with all local 
populations variable at both the CAH and PGI loci; i.e. average 
polymorphism (P) = 0.25, and average heterozygosity (H) ranged between 
0.059 and 0.1 10 for these subgroups. The pisgahensis subgroup exhibited 
less genetic variation. Only the PGI locus was variable in this subgroup, 
and only in three of the six populations studied, such that P = 0.08 and 
H = 0.009 (Table 3). 
