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Interspecific interactions and learning variability jointly drive geographic differences in mate preferences.

https://arctichealth.org/en/permalink/ahliterature286185
Source
Evolution. 2016 Aug;70(8):1896-903
Publication Type
Article
Date
Aug-2016
Author
Machteld N Verzijden
Erik I Svensson
Source
Evolution. 2016 Aug;70(8):1896-903
Date
Aug-2016
Language
English
Publication Type
Article
Keywords
Animals
Biological Evolution
Female
Geography
Learning
Male
Mating Preference, Animal
Odonata - physiology
Pigmentation
Species Specificity
Sweden
Wings, Animal - physiology
Abstract
Co-occurrence of closely related species can cause behavioral interference in mating and increase hybridization risk. Theoretically, this could lead to the evolution of more species-specific mate preferences and sexual signaling traits. Alternatively, females can learn to reject heterospecific males, to avoid male sexual interference from closely related species. Such learned mate discrimination could also affect conspecific mate preferences if females generalize from between species differences to prefer more species-specific mating signals. Female damselflies of the banded demoiselle (Calopteryx splendens) learn to reject heterospecific males of the beautiful demoiselle (C. virgo) through direct premating interactions. These two species co-occur in a geographic mosaic of sympatric and microallopatric populations. Whereas C. virgo males have fully melanized wings, male C. splendens wings are partly melanized. We show that C. splendens females in sympatry with C. virgo prefer smaller male wing patches in conspecific males after learning to reject heterospecific males. In contrast, allopatric C. splendens females with experimentally induced experience with C. virgo males did not discriminate against larger male wing patches. Wing patch size might indicate conspecific male quality in allopatry. Co-occurrence with C. virgo therefore causes females to prefer conspecific male traits that are more species specific, contributing to population divergence and geographic variation in female mate preferences.
PubMed ID
27302691 View in PubMed
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