Caste differentiation and seasonal changes in <i>Vespa velutina</i> (Hym.: Vespidae) colonies in its introduced range

Rome, Quentin; Müller, Franck; Touret-Alby, Agnièle; Darrouzet, Éric; Perrard, A.; Villemant, Claire

doi:10.1111/jen.12210

Cited by 85 publications

(131 citation statements)

References 35 publications

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“…These data differ a little from those observed by Rome et al (2015), which considered that individuals with WW exceeding 0.593 g and DW exceeding 0.250 g were considered to be gynes, while those with lower weights were workers. These discrepancies in the DW may be due to differences in methodology, such as the temperature and drying time for the individuals.…”

Section: Discussioncontrasting

confidence: 54%

“…These discrepancies in the DW may be due to differences in methodology, such as the temperature and drying time for the individuals. Even so, the variation in the DW rank linked to 5% uncertainty was very similar: 91.09% in our study and 87.72% in the data of Rome et al (2015).…”

Section: Discussionmentioning

confidence: 58%

“…In addition, only hornets of the group 2 (classified as "large" hornets) presented high weights. So, following to Rome et al 2015, it can be hypothesized that this group belongs to the gynes. The cuticular profiles discriminate by castes, workers being in chemical group 1 and gynes in group 2.…”

Section: Discussionmentioning

confidence: 99%

“…According to the DW threshold of 0.250 g given by Rome et al (2015), recentlyemerged gynes which have no time to feed are classified in the group of light individuals, i.e. workers.…”

Section: Discussionmentioning

confidence: 99%

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Differentiating between gynes and workers in the invasive hornet Vespa velutina (Hymenoptera, Vespidae) in Europe

Pérez-de-Heredia¹,

Darrouzet²,

Goldarazena³

et al. 2017

JHR

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In theVespinae, morphological differences of castes are generally well-marked, except for some Vespa species, where it is difficult to distinguish between future queens and workers in autumn-winter colonies. Individual weights have widely been used as a distinguishing factor but recently cuticular hydrocarbon profiles seems to be the definitive tool, although much more expensive and time-consuming. Parameters such as size (mesoscutum width), wet and dry weight were analysed, throughout several colonies, to differentiate female castes (workers and gynes) in the hornet Vespa velutina in Europe. These parameters were compared to cuticular hydrocarbon profiles. The results showed that in late autumn, but not earlier, populations are divided into two size groups, which, based on their CHC profiles, can be hypothesized to correspond to workers and gynes. This differentiation mirrored a good separation by size that proves to be more accurate than weight (wet and dry). The size limit between workers and gynes is established at a mesoscutum width of 4.5 mm.

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Section: Discussioncontrasting

confidence: 54%

Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

“…According to the DW threshold of 0.250 g given by Rome et al (2015), recentlyemerged gynes which have no time to feed are classified in the group of light individuals, i.e. workers.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Differentiating between gynes and workers in the invasive hornet Vespa velutina (Hymenoptera, Vespidae) in Europe

Pérez-de-Heredia¹,

Darrouzet²,

Goldarazena³

et al. 2017

JHR

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“…); it is also present in Spain (López, González & Goldarazena ), Portugal (Grosso‐Silva & Maia ), Italy (Federazione Apicoltori Italiani ) and Germany (Rome et al . ). While a single male was observed in Belgium in 2011, very close to the French border (Rome, Muller & Villemant ), the species does not seem to have established itself in that country yet (pers.…”

Section: Introductionmentioning

confidence: 97%

Rapid spread of the invasive yellow‐legged hornet inFrance: the role of human‐mediated dispersal and the effects of control measures

Robinet¹,

Suppo

Darrouzet

2016

Journal of Applied Ecology

100

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Summary The invasive yellow‐legged hornet was first discovered in Europe, in south‐western France, in 2004. It has since spread very rapidly and has caused significant mortality among honeybees and native entomofauna. It also poses a risk to humans because its sting provokes allergic reactions. The objectives of this study were the following: (i) to disentangle the roles played by human‐mediated dispersal and self‐mediated dispersal in the species' rapid range expansion and (ii) to estimate the intensity of control measures in France and determine what needs to be done to slow the hornet's spread and dramatically reduce its population densities. A mathematical model was developed to describe the hornet's potential spread. This model included parameters describing the population growth rate, carrying capacity, self‐mediated dispersal, human‐mediated dispersal and the efficacy of control measures (i.e. the destruction of detected nests). Model parameters were estimated using 2004–2009 occurrence data for France and the model was then validated using 2013 occurrence data. Several scenarios were tested: human‐mediated dispersal was present or absent and control intensity varied. Then, the species' spread in coming years was simulated (from 2013 to 2020). Despite some uncertainty on the value of the parameters, this model is relatively robust. Human‐mediated dispersal may not be necessarily responsible for the hornet's rapid range expansion; the species could spread rapidly on its own. It is likely that to date, an average of 30–40% of detected nests have been destroyed each year. Increasing the percentage of destroyed nests from 30 to 60% could reduce the species' spread by 17% and its nest density by 29%. If 95% of nests are destroyed, the species' spread and nest density could decline by 43% and 53%, respectively. Synthesis and applications. The mathematical model developed in this study shows that human‐mediated dispersal of the invasive yellow‐legged hornet may not be the only factor explaining the hornet's rapid range expansion and that controlling this invasive pest is still possible. Therefore, there is an urgent need to reduce self‐mediated dispersal and to intensify and improve control measures to diminish the species' impact and prevent its further spread. Control measures could combine the mechanical removal and destruction of individuals or infested materials with biological control techniques.

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Status and Management of Invasive Alien Species in Switzerland

Amacher

Silvestri

Walther

2021

Invasive Alien Species

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Caste differentiation and seasonal changes in Vespa velutina (Hym.: Vespidae) colonies in its introduced range

Cited by 85 publications

References 35 publications

Differentiating between gynes and workers in the invasive hornet Vespa velutina (Hymenoptera, Vespidae) in Europe

Differentiating between gynes and workers in the invasive hornet Vespa velutina (Hymenoptera, Vespidae) in Europe

Rapid spread of the invasive yellow‐legged hornet inFrance: the role of human‐mediated dispersal and the effects of control measures

Status and Management of Invasive Alien Species in Switzerland

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