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J Evol Biol

Title:		Seasonal stability and species specificity of environmentally acquired chemical mating signals in orchid bees
Author(s):		Darragh K; Linden TA; Ramirez SR;
Address:		"Department of Evolution and Ecology, University of California, Davis, California, USA. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA"
Journal Title:		J Evol Biol
Year:		2023
Volume:		20230223
Issue:		4
Page Number:		675 - 686
DOI:		10.1111/jeb.14165
ISSN/ISBN:		1420-9101 (Electronic) 1010-061X (Linking)
Abstract:		"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"
Keywords:		Bees Animals Species Specificity Seasons *Pheromones *Reproduction courtship mate choice pheromone reproductive isolation seasonality signals;
Notes:		"MedlineDarragh, Kathy Linden, Tess A Ramirez, Santiago R eng Research Support, Non-U.S. Gov't Switzerland 2023/02/24 J Evol Biol. 2023 Apr; 36(4):675-686. doi: 10.1111/jeb.14165. Epub 2023 Feb 23"