Assessing the impact of alien bees on native ones

Zakardjian, Marie; Jourdan, Hervé; Féon, V. Le; Geslin, B.

doi:10.19103/as.2022.0111.17

Cited by 3 publications

(2 citation statements)

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“…Alien bees may negatively impact native pollinators in a multitude of ways (i.e. competition for food and nesting resources, transmission of diseases and parasites, hybridation; Zakardjian et al (2022) ). Moreover, they may disrupt plant-pollinator interactions and impact native and alien plant reproductive success ( Dohzono and Yokoyama 2010 ).…”

Section: Discussionmentioning

confidence: 99%

Checklist of the bees (Hymenoptera, Apoidea) of New Caledonia

Zakardjian,

Jourdan,

Cochenille

et al. 2023

BDJ

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In a world where insects and notably bees are declining, assessing their distribution over time and space is crucial to evaluate species status and highlight conservation priorities. However, this can be a daunting task, especially in areas such as tropical oceanic islands where exhaustive samplings over time have been lacking. This is the case in New Caledonia, an archipelago located in the southwest Pacific. Historical records of bee species are piecemeal and, although contemporary samplings have significantly advanced our knowledge of the bee fauna of New Caledonia, the status of several species remains to be elucidated. Here, we provide an updated checklist of the 51 bee species recorded for New Caledonia using previous publications and personal samplings. We documented their distribution, origin (i.e. endemic, native or alien) and the year and location of their occurrences. Based on the year of their first capture and the year of their last capture, we determined an occurrence status for each species. Thus, 10 years after the last checklist of the New Caledonian bee fauna, the literature review and recent samplings allowed us to add six new species to the list. Half of them are recently introduced species including one firstly mentioned in this paper (i.e. Hylaeus albonitens). We consider here that 30 species are effectively present on the territory and the presence of 21 species could not be determined due to a lack of data, which highlights the need to increase sampling efforts across New Caledonia. Given the difficulty of exhaustively sampling the entire archipelago, we would recommend taking, as a starting point, altitude environments and areas where data-deficient species were captured. In a broader perspective, biomolecular analyses are crucial to confirm species identifications. This is also needed to make comparisons between archipelagoes and thus clarify the distribution and status of species at the scale of the southwest Pacific.

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Section: Discussionmentioning

confidence: 99%

Checklist of the bees (Hymenoptera, Apoidea) of New Caledonia

Zakardjian,

Jourdan,

Cochenille

et al. 2023

BDJ

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“…Megachile sculpturalis is a univoltine cavity-nesting solitary bee that builds its nests in pre-existing cavities in wooden rods, dead wood or reed stems, as well as in nesting sites abandoned by a variety of other species and in artificial holes, including the so-called bee hotels (Iwata, 1933;Tsuneki, 1970;Guariento et al, 2019). In non-native areas it can occasionally show aggressive behaviour towards the local bee fauna (Lanner et al, 2020a), and its presence can be negatively correlated with the emergence of native bee species (Geslin et al, 2020;Zakardjian et al, 2022), suggesting potential competition for nesting sites. Brood cells are mainly composed by resin mixed with plant debris, while the closing plug is usually composed by a mixture of resin, mud and wood fibres (Batra, 1998;Aguado et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Nesting biology and nest structure of the exotic bee Megachile sculpturalis

Bogo,

Fisogni,

Iannone

et al. 2024

Bull. Entomol. Res.

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From the 1990s, the Southeast Asia native giant resin bee Megachile sculpturalis (Smith, 1853) was introduced first to North America, and then to many countries in Europe. Despite increasing studies on its invasive potential and geographical expansion, information on nesting behaviour of this species is still extremely scarce. To increase knowledge on the nesting biology of M. sculpturalis, we studied multiple aspects of nesting and pollen provisioning in three consecutive years in artificial nests in Bologna, Italy. We observed 166 bees visiting nests, and followed individual nesting behaviour and success of 41 adult females. We measured cavity diameter in 552 nests and characterised the structure in 100 of them. More than 95% of nest diameters ranged between 0.6 and 1.2 cm, overlapping with several sympatric species of cavity-nesting hymenopterans in the study area. Most nests had a first chamber from the entrance of variable length without brood, followed by an average of about two brood cells with a mean length of 2.85 ± 0.13 cm each. The pollen stored in brood cells was almost monofloral, belonging to the ornamental plant Styphnolobium japonicum (L.) Schott. We estimated that a single female should visit ≈180 flowers to collect enough pollen for a single brood cell. These results fill knowledge gaps on the nesting biology and nest structure of the exotic M. sculpturalis, and they are discussed in relation to possible competition with native bees for nesting sites and foraging resources.

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