Fig 2 - uploaded by Michael Staab
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Results of the best fitting models for O. cornuta. (A) Sex allocation preference towards female offspring increased with internode diameter at the individual scale. (B) A higher pollen weight was found in cells with larger internode diameter at the individual scale. (C) Females received more pollen than males at the individual scale. Solid lines indicate model predictions with 95% confidence intervals indicated by shaded polygons.
Source publication
Unravelling the relationships between insect population dynamics and habitat properties is often complex. Established theoretical concepts, which predict an influence of available resources on sex determination, have often not been tested with quantitative field data. Cavity-nesting Hymenoptera are suitable to assess the influence of habitat proper...
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Context 1
... population scale (n = 30 study sites), no fixed effect was retained in the best fitting model, whereas at the individual scale (n = 194 brood cells in 87 reed internodes from 10 study sites), sex allocation preference was influenced by internode diameter (Table 1). An increase in internode diameter favoured female offspring (z = 4.217, p<0.001; Fig. 2A). Resource weight (n = 110 brood cells in 56 reed internodes from 8 sites) at the individual scale was related to internode diameter and sex ( Table 1), suggesting that increasing internode diameter favours female offspring (t = 4.560, p<0.001; Fig. 2B). Also, females received more resource provisions than males (t = 9.344, p<0.001; ...
Context 2
... (Table 1). An increase in internode diameter favoured female offspring (z = 4.217, p<0.001; Fig. 2A). Resource weight (n = 110 brood cells in 56 reed internodes from 8 sites) at the individual scale was related to internode diameter and sex ( Table 1), suggesting that increasing internode diameter favours female offspring (t = 4.560, p<0.001; Fig. 2B). Also, females received more resource provisions than males (t = 9.344, p<0.001; Fig. 2C). No variable representing food resource availability was selected in the best fitting ...
Context 3
... Fig. 2A). Resource weight (n = 110 brood cells in 56 reed internodes from 8 sites) at the individual scale was related to internode diameter and sex ( Table 1), suggesting that increasing internode diameter favours female offspring (t = 4.560, p<0.001; Fig. 2B). Also, females received more resource provisions than males (t = 9.344, p<0.001; Fig. 2C). No variable representing food resource availability was selected in the best fitting ...
Context 4
... population scale (n = 30 study sites), no fixed effect was retained in the best fitting model, whereas at the individual scale (n = 194 brood cells in 87 reed internodes from 10 study sites), sex allocation preference was influenced by internode diameter (Table 1). An increase in internode diameter favoured female offspring (z = 4.217, p<0.001; Fig. 2A). Resource weight (n = 110 brood cells in 56 reed internodes from 8 sites) at the individual scale was related to internode diameter and sex ( Table 1), suggesting that increasing internode diameter favours female offspring (t = 4.560, p<0.001; Fig. 2B). Also, females received more resource provisions than males (t = 9.344, p<0.001; ...
Context 5
... (Table 1). An increase in internode diameter favoured female offspring (z = 4.217, p<0.001; Fig. 2A). Resource weight (n = 110 brood cells in 56 reed internodes from 8 sites) at the individual scale was related to internode diameter and sex ( Table 1), suggesting that increasing internode diameter favours female offspring (t = 4.560, p<0.001; Fig. 2B). Also, females received more resource provisions than males (t = 9.344, p<0.001; Fig. 2C). No variable representing food resource availability was selected in the best fitting ...
Context 6
... Fig. 2A). Resource weight (n = 110 brood cells in 56 reed internodes from 8 sites) at the individual scale was related to internode diameter and sex ( Table 1), suggesting that increasing internode diameter favours female offspring (t = 4.560, p<0.001; Fig. 2B). Also, females received more resource provisions than males (t = 9.344, p<0.001; Fig. 2C). No variable representing food resource availability was selected in the best fitting ...
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... This study provides evidence that the European orchard bee (O. nesting cycle could possibly be explained by an interaction between nesting behaviour, macroparasite activity and attractant efficacy (Dainese et al., 2018;Piot et al., 2021;Torchio & Tepedino, 1980;Wittmann et al., 2023). Indeed, certain macroparasites such as the drosophilid flies (Cacoxenus Cacoxenus indigator) are active later in the nesting cycle , while both macro-and microparasite infestation also increase later in the season when flowers are scarcer after mass-flowering crops have bloomed (Dainese et al., 2018;Piot et al., 2021). ...
... Moving forward, evaluating the economic viability of different trap nest designs and associated management costs will be crucial for developing targeted and cost-effective mason bee management strategies for farmers and beekeepers.The absence of an effect of the attractant on nesting performance can be attributed to the fact that ecological and resource variables are cancelled out in the paired setup. Indeed, nesting performance has been found to be multifaceted and influenced by factors such as landscape-level resources, material type, seasonal variation and the presence of macroparasitesWittmann et al., 2023;Zaragoza-Trello et al., 2021). However, by isolating the effect of the attractant, I demonstrate that its impact on nesting preference is distinct from broader ecological drivers of performance.The findings of the attractant's effect on the infestation of nest-associated macroparasites possibly suggests a temporal dynamic that warrants more research and further consideration. ...
Mason bees ( Osmia . spp) can provide an alternative for crop pollination management in addition to the Western honeybees ( Apis mellifera ). Targeted evidence‐based guidelines can improve cost‐effective management of mason bees. Here, I test the effect of an attractant spray developed in the United States for improving the nesting preference for artificial trap nests of mason bees in Belgium. More specifically, this study investigates the effect of the attractant spray on the nesting preference and nesting performance of the European orchard bee ( Osmia cornuta ), as well as its effect on the infestation of nest‐associated macroparasites. The number of sealed nesting cavities was twice as high in the trap nests that were treated with the attractant spray. Nesting performance expressed as number of brood cells per cavity, successful cocoon formation, adult emergence, proportion of female bees in the offspring and the number of dead larvae was not different between the treated and the untreated nests. Overall infestation of macroparasites, and infestation of drosophilid flies in particular, were both twice as high in untreated nests. This study provides evidence that the attractant spray improves nesting preference and reduces macroparasite infestation in O. cornuta . The use of this attractant can provide growers and stakeholders with an effective management strategy to prevent infestation by macroparasites and promote efficient bee breeding.
