Effects of landscape, resource use, and body size on genetic structure in bee populations

2024 · doi:10.22541/au.171037989.94455815/v1
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This preprint assessed how fragmented, human-altered landscapes and species traits shape genetic structure and genetic variation in populations of seven Euglossine bee species (genus Euglossa), using thousands of SNP loci across fragmented habitats. The authors tested predictions that deforested areas restrict gene flow, that larger species show lower genetic structure, that more resource-specialized species show higher genetic structure, and that sites with more intact habitat show higher genetic diversity. Contrary to previous bee studies, they found no association between body size and genetic structure, while genetic structure was higher in more resource-specialized species and intact habitat around/between sites was positively associated with measures of gene flow and genetic diversity. The paper is a preliminary, non-peer-reviewed preprint, and this is the only limitation explicitly stated in the provided text. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

Quantifying genetic structure and levels of genetic variation are fundamentally important to predicting the ability of populations to persist in human-altered landscapes and adapt to future environmental changes. Genetic structure reflects the dispersal of individuals over generations, which can be mediated by species-level traits or environmental factors. Dispersal distances are commonly positively associated with body size and negatively associated with the amount of degraded habitat between sites, motivating investigation of these potential drivers of dispersal concomitantly. We quantified genetic structure and genetic variability within populations of seven Euglossine bee species in the genus Euglossa across fragmented landscapes. We genotyped bees at thousands of SNP loci and tested the following predictions: (1) deforested areas restrict gene flow; (2) larger species have lower genetic structure; (3) species with greater resource specialization have higher genetic structure; and (4) sites surrounded by more intact habitat have higher genetic diversity. Contrasting with previous work on bees, we found no associations of body size and genetic structure. Genetic structure was higher for species with greater resource specialization, and the amount of intact habitat between or surrounding sites was positively associated with parameters reflecting gene flow and genetic diversity. These results challenge the dominant paradigm that individuals of larger species disperse farther. They suggest that landscape and resource requirements are important factors mediating dispersal, and they motivate further work into ecological drivers of gene flow for bees. Information & Authors Information Version history Copyright This work is licensed under a Non Exclusive No Reuse License. Collection

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Authors Metrics & Citations Metrics Article Usage 376views 154downloads Citations Download citation Melissa Hernandez, Sevan Suni. Effects of landscape, resource use, and body size on genetic structure in bee populations. Authorea. 14 March 2024. DOI: https://doi.org/10.22541/au.171037989.94455815/v1 DOI: https://doi.org/10.22541/au.171037989.94455815/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu.

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