Population genetic structure of Nantucket pine tip moth

Area of Science:

• * Population genetics
• * Insect ecology
• * Molecular biology

Background:

• * Understanding genetic variation is crucial for managing insect pests like the Nantucket pine tip moth (NPTM).
• * Polymorphic isozyme loci provide insights into population structure and evolutionary processes.

Purpose of the Study:

• * To analyze genetic variation at polymorphic isozyme loci in NPTM populations.
• * To investigate genetic differentiation and population structure across geographic locations and generations.

Main Methods:

• * Analysis of polymorphic isozyme loci (LAP, MDH, α-GPDH, AK, PGM) in NPTM populations.
• * Comparison of allele frequencies across five geographic locations and three generations at one site.
• * Assessment of Hardy-Weinberg equilibrium to infer population structure.

Main Results:

• * Four loci (LAP, MDH, α-GPDH, AK) showed limited variation with consistent high-frequency alleles across populations.
• * The PGM locus exhibited high polymorphism with 15 alleles, varying significantly in frequency among populations.
• * An excess of homozygotes in 7 out of 10 populations suggested inbreeding or population subdivision.

Conclusions:

• * Genetic differentiation among locally disjunct NPTM populations is strongly indicated.
• * The observed patterns suggest non-neutral evolution at the studied loci, particularly PGM.
• * Inbreeding structures or populational subdivision likely influence NPTM genetic diversity.