Impact of Resource Levels on Sex Ratio and Resource Allocation in the Solitary Bee,<i>Megachile rotundata</i>

Peterson, Jason H.; Roitberg, Bernard D.

doi:10.1093/ee/35.5.1404

Cited by 41 publications

(44 citation statements)

References 36 publications

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“…Roulston and Cane (2000) suggest that, for bee species that nest in natural cavities, the size of the cavity used is strongly related to the amount of food supplied. Studies that compared resource availability and dry mass showed that bees with access more food are bigger (Peterson and Roitberg 2006) and there is a positive relation between adult dry mass and food provisioned (Bosch and Vicens 2002). We did not find a correlation between PC1 and food supplied, but when we used just the measures from estimated dry mass there is a correlation between estimated dry mass and food supplied (R 2 = 0.72; d.f.…”

Section: Discussioncontrasting

confidence: 54%

The body size of the oil-collecting bee Tetrapedia diversipes (Apidae)

Pinto¹,

Silva²,

Cordeiro³

et al. 2015

JHR

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The body size of bees can affect their fitness in many ways. There is an indirect relationship between the size of the mother and the size of her progeny. This is so because large mothers use larger nests and brood cells and have higher foraging capacity than small mothers, and consequently large mothers supply a larger amount of food to their larvae, which grow larger. We analyzed the relationship between body size of individual oil-collecting bees of the species Tetrapedia diversipes and the size of their brood cells from Boracéia and Ilhabela, southeastern Brazil. In addition, we manipulated 26 brood cells of a population at the campus of Universidade de São Paulo by removing food from 13 brood cells. In this case, we checked the relationship between the body size of these bees and the amount of food consumed. We measured 241 individuals: 135 males and 106 females. No significant size difference was found between males and females. Only a weak relationship between body size and brood cell volume was detected, possibly due to the low variation in both female size and brood cell size. In the food manipulation experiment, the unmanipulated individuals were larger than individuals for whom part of the provisions were removed but no correlation was found between amount of food removed and offspring size.

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Section: Discussioncontrasting

confidence: 54%

The body size of the oil-collecting bee Tetrapedia diversipes (Apidae)

Pinto¹,

Silva²,

Cordeiro³

et al. 2015

JHR

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show abstract

“…Thus, assuming the importance of stored lipids to adult reproductive success and the fact that the rate at which body fats are metabolized during postwintering development is temperature-dependent, our results suggest that rearing temperature may have an indirect effect on adult Þtness, perhaps limiting the size and number of eggs laid by females. The low r 2 values in the regressions of P f on T rt indicate that the amount of fat remaining at emergence also is inßuenced by other factors, including provision quality and quantity (Klostermeyer et al 1973, Horne 1995, Kim 1999, Peterson and Roitberg 2006; maternal effects (OÕNeill et al 2010); and temperature experienced at other times in the beeÕs life cycle (e.g., because of variation in temperature within nesting materials; Peterson et al 1994).…”

Section: Discussionmentioning

confidence: 99%

Effect of Temperature on Post-Wintering Development and Total Lipid Content of Alfalfa Leafcutting Bees

et al. 2011

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Temperature plays an important role in effective management of the alfalfa leafcutting bee [Megachile rotundata (F.); Megachilidae], the major commercial pollinator of seed alfalfa [Medicago sativa (L.); Fabaceae] in North America. To improve our understanding of threshold and optimum rearing temperatures of M. rotundata, we examined the effect of temperature on postwintering development by using a greater number of temperature treatments than applied in previous studies (19 versus eight or fewer) and analytical tools formulated to model nonlinear relationships between temperature and insect development rates. We also tested the hypothesis that rearing temperature influences adult body lipid content at emergence, which could affect adult survival, establishment and performance as a pollinator, and reproductive success. We found that the Lactin-2 and Briere-2 models provided the best fits to data and gave reasonable estimates of lower (16-18°C) and upper (36-39°C) developmental thresholds and optimum (33-34°C) rearing temperatures for maximizing development rate. Bees successfully emerged over a broad range of temperatures (22-35°C), but variation in development rate among individuals reared at the same temperature was lowest at 31-33°C. The optimum rearing temperature to maximize the proportion of body lipids in adults was 27-29°C. Our results are discussed in relation to previous findings and speak to the difficulties in designing practical rearing guidelines that simultaneously maximize development rate, survival, and adult condition, while synchronizing adult emergence with alfalfa bloom.

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“…To quantify the effect of different foraging distances on reproduction, the mean number of brood cells provisioned per time unit was estimated for each species and foraging distance tested. The quantity of pollen and nectar contained in the brood cells of solitary bees is known to vary considerably within species depending on the sex of the offspring, the size of the adult females or the quantity and availability of host plants (Bosch & Vicens 2006; Peterson & Roitberg 2006a, b; Bosch 2008). Therefore, the mean time required to provision an average‐sized standard brood cell was determined for each species and foraging distance by multiplying the mean duration of a foraging bout by the average number of flights needed to provision a single brood cell.…”

Section: Methodsmentioning

confidence: 99%

Long foraging distances impose high costs on offspring production in solitary bees

Zurbuchen

Cheesman

Klaiber

et al. 2010

Journal of Animal Ecology

160

109

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Summary1. Solitary bees are central place foragers returning to their nests several times a day with pollen and nectar to provision their brood cells. They are especially susceptible to landscape changes that lead to an increased spatial separation of suitable nesting sites and flower rich host plant stands. While knowledge of bee foraging ranges is currently growing, quantitative data on the costs of foraging flights are very scarce, although such data are crucial to understand bee population dynamics. 2. In this study, the impact of increased foraging distance on the duration of foraging bouts and on the number of brood cells provisioned per time unit was experimentally quantified in the two pollen specialist solitary bee species Hoplitis adunca and Chelostoma rapunculi. Females nesting at different sites foraged under the same environmental conditions on a single large and movable flowering host plant patch in an otherwise host plant free landscape. 3. The number of brood cells provisioned per time unit by H. adunca was found to decrease by 23%, 31% and 26% with an increase in the foraging distance by 150, 200 and 300 m, respectively. The number of brood cells provisioned by C. rapunculi decreased by 46% and 36% with an increase in the foraging distance by 500 and 600 m, respectively. 4. Contrary to expectation, a widely scattered arrangement of host plants did not result in longer mean duration of a foraging bout in H. adunca compared to a highly aggregated arrangement, which might be due to a reduced flight directionality combined with a high rate of revisitation of already depleted flowers in the aggregated plant arrangement or by a stronger competition and disturbance by other flower visitors. 5. The results of this study clearly indicate that a close neighbourhood of suitable nesting and foraging habitats is crucial for population persistence and thus conservation of endangered solitary bee species.

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Impact of Resource Levels on Sex Ratio and Resource Allocation in the Solitary Bee,Megachile rotundata

Cited by 41 publications

References 36 publications

The body size of the oil-collecting bee Tetrapedia diversipes (Apidae)

The body size of the oil-collecting bee Tetrapedia diversipes (Apidae)

Effect of Temperature on Post-Wintering Development and Total Lipid Content of Alfalfa Leafcutting Bees

Long foraging distances impose high costs on offspring production in solitary bees

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