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Systematics, Evolution, and Biodiversity

Student Competition Poster

Undergrad SysEB: Microbes and Evolution

D3162: X-linkage of the pgm locus in Dysdera crocata

Monday, November 14, 2022
9:00 AM – 6:30 PM PT
Location: West Exhibit Hall A
In-Person Poster Student Competition

    Presenting Author(s)

  • Sabriya A. Seid

    undergraduate student
    Loyola Marymount University
    Los Angeles, California

    • Co-Author(s)

  • MR

    Martina Ramirez

    Dean
    St. Norberts College
    De Pere, Wisconsin

Size, genotype, and sex variations in spiders may be interconnected, for example, a specific genotype relating to a larger size may only be present in one sex. Correlations between bodyweight, sex, and phosphoglucomutase (PGM) genotypes were examined in the woodlouse spider Dysdera crocata C. L. Koch, 1838. Adult and juvenile D. crocata (n = 319) were collected from leaf litter at Kenneth Hahn State Recreation Area, Los Angeles County in 2010. They were then sexed, weighed, and genotyped for PGM using allozyme electrophoresis. Heterozygotes (AB) were underrepresented with respect to Hardy-Weinberg expectations in all groups, except for adult females, and were completely absent among all males. Heterozygous spiders were heavier than AA and BB homozygotes, which suggests a relationship between PGM genotypes and arachnid fitness. The lack of heterozygous males in the 2010 sample prompted the collection of another sample from (n = 27 adults) in 2021, which showed a mix of three genotypes (AA, AB, BB) among females, but an absence of AB males. D. crocata do not have a Y chromosome; male D. crocata have a single X chromosome, while females have two X chromosomes. If the PGM locus is X-linked, this would account for the general underrepresentation of heterozygotes and the absence of heterozygous males. Further investigation will be needed to verify the X-linkage of PGM in D. crocata.