期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 36, 期 4, 页码 675-686出版社
WILEY
DOI: 10.1111/jeb.14165
关键词
courtship; mate choice; pheromone; reproductive isolation; seasonality; signals
The study found that orchid bee perfumes exhibit stable species-specific differences, which may contribute to reproductive isolation between species. Despite considerable differences within species, species specificity remains consistent throughout the year, suggesting that these perfumes play an important role in reproductive isolation and are affected by stabilizing selection towards the species mean. The study also identified strong correlations in the abundance of some perfume compounds, possibly due to shared collection sources between species.
Traits that mediate reproductive isolation between species, such as those involved in mate choice and/or recognition, are predicted to experience stabilizing selection towards the species mean. Male orchid bees collect chemical compounds from many sources, such as plants and fungi, which they use as a perfume signal (pheromone) during courtship display, and are suggested to contribute to reproductive isolation between species. Environmentally acquired signals are more prone to variation as source availability can vary through space and time. If orchid bee perfumes are important for reproductive isolation between species, we expect them to exhibit stable species-specific differences in time and space. Here, we describe phenotypic patterns of inter- and intraspecific variation in the male perfumes of three sympatric species of Euglossa orchid bees across an entire year, investigating both their seasonality and species specificity. Our analysis revealed considerable within-species variation in perfumes. However, species specificity was maintained consistently throughout the year, supporting the idea that these perfumes could play an important role in reproductive isolation and are experiencing stabilizing selection towards a species mean. Our analysis also identified strong correlations in the abundance of some compounds, possibly due to shared collection sources between species. Our study suggests that orchid bee perfumes are robust in the face of environmental changes in resource availability and thus can maintain reproductive isolation between species.
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