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Eumelanin and pheomelanin are predominant pigments in bumblebee (Apidae: Bombus) pubescence

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Polidori, Carlos y Alberto, Jorge y Ornosa Gallego, Concepción (2017) Eumelanin and pheomelanin are predominant pigments in bumblebee (Apidae: Bombus) pubescence. PeerJ, 5 (3300). pp. 1-21. ISSN ESSN: 2167-8359

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URL Oficial: https://peerj.com/articles/3300/



Resumen

Background: Bumblebees (Hymenoptera: Apidae: Bombus) are well known for their important inter- and intra-specific variation in hair (or pubescence) color patterns, but the chemical nature of the pigments associated with these patterns is not fully understood. For example, though melanization is believed to provide darker colors, it still unknown which types of melanin are responsible for each color, and no conclusive data are available for the lighter colors, including white. Methods: By using dispersive Raman spectroscopy analysis on 12 species/subspecies of bumblebees from seven subgenera, we tested the hypothesis that eumelanin and pheomelanin, the two main melanin types occurring in animals, are largely responsible for bumblebee pubescence coloration. Results: Eumelanin and pheomelanin occur in bumblebee pubescence. Black pigmentation is due to prevalent eumelanin, with visible signals of additional pheomelanin, while the yellow, orange, red and brown hairs clearly include pheomelanin. On the other hand, white hairs reward very weak Raman signals, suggesting that they are depigmented. Additional non-melanic pigments in yellow hair cannot be excluded but need other techniques to be detected. Raman spectra were more similar across similarly colored hairs, with no apparent effect of phylogeny and both melanin types appeared to be already used at the beginning of bumblebee radiation. Discussion: We suggest that the two main melanin forms, at variable amounts and/or vibrational states, are sufficient in giving almost the whole color range of bumblebee pubescence, allowing these insects to use a single precursor instead of synthesizing a variety of chemically different pigments. This would agree with commonly seen color interchanges between body segments across Bombus species.


Tipo de documento:Artículo
Palabras clave:Bombus; Eumelanin; Depigmentation; Pigmentation; Pheomelanin; Pubescence Phenotype, Hymenoptera, Raman spectroscopy
Materias:Ciencias Biomédicas > Biología > Insectos
Código ID:44097
Depositado:27 Jul 2017 08:04
Última Modificación:27 Jul 2017 08:43

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