Abstracts - Deutsche Zoologische Gesellschaft

Evolutionary Biology Posters 127for positive selection for detoxification abilities we started a comparison of two Western Europeanhouse mouse populations (Mus musculus domesticus). The respective populations have split about3,000 years ago. As their history is reasonably well known, we can exclude demographic processes,which can produce patterns similar to selective sweeps. Candidate genes for detoxification enzymesare represented in the Cytochrom P450 (Cyp) gene family. As these genes are derived from duplicationsthey are clustered in chromosomal regions. We used dotplot analysis to get insights into the ageof the different duplicates. Expression analysis as well as variability measurements gave us first hintsfor positive selection acting on several copies of these genes.P EB.6 - ENPopulation structure of the American Lobster (Homarus americanus): the potentialspread of shell diseaseJana Deppermann 1 , Gabriele Gerlach 1,2 , Jelle Atema 31Carl von Ossietzky University, Oldenburg; 2 Marine Biological Laboratory, Woods Hole, MA,USA; 3 Boston University Marine Program, Boston, USAShell disease has crippled the lobster fisheries of Southern New England, while the stocks morenorth in the Gulf of Maine region are mostly untouched. Shell disease is quite common in crustaceansand thought to be of bacterial origin. Differences in the outbreak of the disease could be due toe.g. regional stock differences in susceptibility, including resistance and tolerance, as well as limitedconnectivity among populations. To date very little is known about how the 3 week long pelagicphase of lobster larvae and/or adult migration influence population connectivity, gene flow and thepotential for spreading the disease. To analyze genetic exchange among lobster populations fromdifferent locations from the east coast of the US we used newly developed EST (expressed sequencetags) linked microsatellites. EST linked markers are thought to be under selection and might showdifferences in local adaptation. In some of these markers we found significant genetic differencesbetween populations suggesting limited connectivity and differential selection. The F STvalues wereup to 10 times higher than in neutral microsatellite markers. This project is part of the Rhode IslandSeagrant to study the spread of lobster shell disease.P EB.7 - ENMale attractiveness and greed in scorpionfliesLeif EngqvistInstitut für Evolutionsbiologie und Ökologie, Universität BonnIn species where males invest heavily in multiple matings, there is likely to be a trade-off betweenmating investment and number of matings. Males are therefore expected to allocate resources prudentlyacross successive matings. Attractive males that will have a high mating success might thereforebe forced to decrease mating investment in comparison to less attractive males that might affordto increase mating investment. Furthermore, if there is genetic variation in attractiveness, one mightexpect to find a negative genetic correlation between attractiveness and mating investment. In thescorpionfly Panorpa cognata (Insecta: Mecoptera), males offer costly salivary secretions as nuptialgifts to females. By producing large secretions, males increase copulation duration, sperm transferand, hence ultimately, sperm competition success. Thus, males that produce large nuptial gifts willhave a high fertilization success but as resources are limited, this might come at a cost of a reduced