Genetic Variability and Fitness in the Green Lynx Spider Peucetia viridans (Araneae, Oxyopidae)
Authors:Hilda Delgadillo, Brooke Kootman, Hayley Quartuccio
Mentor:Martina Ramirez, Professor of Biology, Loyola Marymount University
The relationship between fitness and the genetic variability was investigated in the green lynx spider Peucetia viridans. In 2010 and 2011, we collected female P. viridans and their egg sacs from Kenneth Hahn State Recreation Area, Los Angeles, CA (2010, n=60; 2011, n=150). In lab, three measures of female body condition and 11 measures of reproductive performance were determined for each spider. With samples from both years, we determined the phosphoglucose isomerase (PGI) genotypes for each female using allozyme electrophoresis. With 2010 spiders, PGI BC females made more egg sac silk relative to egg sac mass and offspring number than PGI CC females, while PGI CC females invested more in clutch and egg sac mass relative to their own mass than PGI BC females. In 2011, PGI BC and PGI CC females did not significantly differ for any reproductive indices. The fact that significant differences among PGI genotypes were detected in 2010 but not in 2011 could be due to many factors. One factor which differed greatly between years was rainfall, since in 2010-2011, Los Angeles had nearly 4” more rain than in 2009-2010. Thus, prey items for P. viridans may have been easier to find in 2011 than in 2010, resulting in generally heavier females and consequently more minimal differences in reproductive performance among genotypes in 2011.