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Supplemental Data S1 Gender Differences in Species

Summary: Supplemental Data S1
Gender Differences in Species
Recognition and the Evolution
of Asymmetric Sexual Isolation
Erik I. Svensson, Kristina Karlsson, Magne Friberg,
and Fabrice Eroukhmanoff
Supplemental Experimental Procedures
Note on PSI Indices
The PSI indices used in our study have the advantage over tradi-
tional isolation indices in that they show less asymptotic statistical
bias than do most other indices, and they can readily be applied
to field data, in which the number of the different species or morphs
are typically unequal and not under control by the investigator [S1
S3]. Moreover, PSI indices also separate the true degree assortative
mating from the effects of sexual selection that could arise from dif-
ferences in mating propensity between the different species [S1,
S2]. The joint isolation index (I) reveals the overall degree of sexual
isolation, and ranges from 21 (perfect disassortative mating) to 1
(perfect assortative mating). In this study, I was estimated from
the four different PSI indices of the mating pairs and was found to


Source: Agrell, Jep - Department of Ecology, Lunds Universitet
Svensson, Erik - Department of Ecology, Lunds Universitet


Collections: Environmental Sciences and Ecology