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Título

Comparative flight morphology in queens of invasive and native Patagonian bumblebees (Hymenoptera: Bombus)

AutorPolidori, Carlo ; Nieves-Aldrey, J. L.
Palabras claveBombus dahlbomii
Bombus terrestris
Flight muscle ratio
Wing loading
Wing aspect ratio
Fecha de publicación2015
EditorElsevier
CitaciónComptes Rendus Biologies 338: 126-133 (2015)
ResumenSince its introduction in Chile, the European Bombus terrestris L. (Hymenoptera: Apidae) has progressively reduced the abundance of the native Patagonian bumblebee, Bombus dahlbomii Guérin. Because an important cause of successful invasion of a species may depend on a potentially advantageous phenotype, we studied morphologies related to flight performance (flight muscle ratio (FMR), wing loading (WL), excess power index (EPI, which integrates FMR and WL) and wing aspect ratio (AR)) in the queens of the two species. Previous empirical studies showed that greater FMR, AR and EPI, and lower WL increase flight performance. In the Patagonian Chilean fjord where the study was carried out, B. dahlbomii was 40% heavier than B. terrestris, a difference theoretically allowing the queens of the native species to take off with heavier loads, despite the fact that the two species have virtually identical FMRs. However, FMR negatively depended on body mass at the intra-specific level. The total wing area was 35% greater in B. dahlbomii, but the difference in forewing length was only of 16%. Once taken into account the effect of body size, WL, was significantly lower in B. terrestris. AR increased with body mass and did not differ between species. EPI was weakly but significantly higher in B. terrestris. Experiments formally linking such parameters with flight performance may help to explain the observed quick and wide spread of this alien species in Patagonia in the last few years.
Versión del editorhttp://dx.doi.org/10.1016/j.crvi.2014.11.001
URIhttp://hdl.handle.net/10261/118107
DOI10.1016/j.crvi.2014.11.001
ISSN1631-0691
E-ISSN1768-3238
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