Sex Ratio, Body Size and Seasonality in a Solitary Bee, Osmia lignaria propinqua Cresson (Hymenoptera: Megachilidae)

Torchio, Phillip F.; Tepedino, Vincent J.

doi:10.2307/2408004

Cited by 61 publications

(44 citation statements)

References 14 publications

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“…However, while it is likely that O. bruneri is characterized by large effective population size as required by Kolman's model, it is unclear whether the requirement for a population that is frequently at the equilibrium sex-ratio is met. Other Osmia species that are likely to have large, panmictic populations show substantial deviations from the equilibrium sex-ratio (Tepedino and Torchio, 1982a;Torchio and Tepedino, 1982). For this reason, and because our sample size is small (16 female parents), the agreement with Kolman's prediction should be regarded as tentative.…”

Section: Discussionmentioning

confidence: 79%

“…Expected (optimal) sex-ratio (ESR) was estimated by using offspring weight as a measure ofparental investment: the ratio of female/male fresh weight (mg) gives the ESR (5I'i'). This follows Trivers and Hare (1976), Noonan (1978), Metcalf (1980), Torchio and Tepedino (1980), Tepedino and Torchio (l982a, 1982b), and others who have studied sex-ratio in Hymenoptera.…”

mentioning

confidence: 68%

“…1). As in O. I. propinqua, this seasonal transition is more reasonably attributed to changes in foraging efficiency that accompany aging than to changes in resource availability (Torchio and Tepedino, 1980;Tepedino and Torchio, 1982b). Other studies of solitary aculeates have also documented either a decline in foraging efficiency with season (Strickler, 1982;Stephen and Torchio, 1961) or a decline in the proportion of females produced with season (Danks, 1970;Cooper, 1979), but these studies have not distinguished between aging or resource abundance as the probable cause.…”

Section: Discussionmentioning

confidence: 99%

“…There are other questions from parental-investment and sex-allocation theory with which we shall be concerned. 1) Is there a seasonal transition in investment, from emphasis on production ofthe more costly sex (females) early in the season to production of the less costly sex (males) later, as has been found for O. lignaria propinqua (Torchio and Tepedino, 1980;Tepedino and Torchio, 1982b)? ; and do O. bruneri females also tend to reduce the size and number of offspring produced over time?…”

mentioning

confidence: 99%

“…3) Lastly, is there evidence for parent-offspring heritability for size? MATERIALS AND METHODS We chose to study O. bruneri for several reasons: 1) it is widespread and easily obtained; 2) foraging and nesting behavior appear to be unaffected when artificial wooden domiciles are supplied in a greenhouse environment; and 3) it can be compared with its congener, O. lignaria propinqua Cresson (Torchio and Tepedino, 1980;Torchio, 1982a, 1982b;Tepedino et aI., 1984). Like O. I. propinqua, O. bruneri is polylectic and univoltine (Hurd, 1979;Frohlich and Parker, unpubl.).…”

mentioning

confidence: 99%

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Sex Ratio, Parental Investment, and Interparent Variability in Nesting Success in a Solitary Bee

Frohlich¹,

Tepedino²

1986

Evolution

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Observations of uniquely marked females of the solitary, twig-nesting bee, Osmia bruneri, were conducted under greenhouse conditions to test several predictions of sex-ratio and parental-investment theory. In support of Fisher's (1958) theory, we found that the observed sex-ratio of progeny in this dimorphic species did not differ from that expected on the basis of average male and female weights. Investment patterns also exhibited a seasonal component: female parents produced more female than male offspring early in the nesting season but reversed this pattern later. Interfemale variability was large for all nesting parameters examined. Neither female-parent size nor the rate at which females completed cells was significantly related to several estimates of parent fitness. Parent-offspring heritability for size was also low. We found no evidence to support the hypothesis that progeny sex-ratios are influenced by maternal condition. Variance in progeny sex-ratios was large, but the population sex-ratio probably departs frequently from the equilibrium value. The results marginally support Kolman's (1960) prediction of large variance in progeny sex-ratios in large panmictic populations. We conclude that variability among females in investment patterns and variability in size among progenies are probably maintained by such factors as resource heterogeneity and the shape of the adult survivorship curve.

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Section: Discussionmentioning

confidence: 79%

mentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Sex Ratio, Parental Investment, and Interparent Variability in Nesting Success in a Solitary Bee

Frohlich¹,

Tepedino²

1986

Evolution

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When beggars are choosers—How nesting of a solitary bee is affected by temporal dynamics of pollen plants in the landscape

Persson

Mazier

Smith

2018

Ecology and Evolution

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Wild bees are declining in intensively farmed regions worldwide, threatening pollination services to flowering crops and wild plants. To halt bee declines, it is essential that conservation actions are based on a mechanistic understanding of how bee species utilize landscapes. We aimed at teasing apart how foraging resources in the landscape through the nesting season affected nesting and reproduction of a solitary bee in a farmland region. We investigated how availability of floral resources and potentially resource‐rich habitats surrounding nests affected nest provisioning and reproduction in the solitary polylectic bee Osmia bicornis. The study was performed in 18 landscape sectors dominated by agriculture, but varying in agricultural intensity in terms of proportion of organic crop fields and seminatural permanent pastures. Pasture‐rich sectors contained more oak (Quercus robur), which pollen analysis showed to be favored forage in early season. More oaks ≤100 m from nests led to higher proportions of oak pollen in nest provisions and increased speed of nest construction in early season, but this effect tapered off as flowering decreased. Late‐season pollen foraging was dominated by buttercup (Ranunculus spp.), common in various noncrop habitats. Foraging trips were longer with more oaks and increased further through the season. The opposite was found for buttercup. Oak and buttercup interacted to explain the number of offspring; buttercup had a positive effect only when the number of oaks was above the mean for the studied sectors. The results show that quality of complex and pasture‐rich landscapes for O. bicornis depends on preserving existing and generating new oak trees. Lignose plants are key early‐season forage resources in agricultural landscapes. Increasing habitat heterogeneity with trees and shrubs and promoting suitable late‐flowering forbs can benefit O. bicornis and other wild bees active in spring and early summer, something which existing agri‐environment schemes seldom target.

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Effects of exposure to winter oilseed rape grown from thiamethoxam-treated seed on the red mason bee Osmia bicornis

Ruddle

Elston

Klein

et al. 2017

Environmental Toxicology and Chemistry

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There has been increasing interest in the effects of neonicotinoid insecticides on wild bees. In solitary bee species the direct link between each individual female and reproductive success offers the opportunity to evaluate effects on individuals. The present study investigated effects of exposure to winter oilseed rape grown from thiamethoxam-treated seed on reproductive behavior and output of solitary red mason bees (Osmia bicornis) released in 6 pairs of fields over a 2-yr period and confined to tunnels in a single year. After adjustment to the number of females released, there was significantly lower production of cells and cocoons/female in tunnels than in open field conditions. This difference may be because of the lack of alternative forage within the tunnels. Under open field conditions, palynology of the pollen provisions within the nests demonstrated a maximum average of 31% oilseed rape pollen at any site, with Quercus (oak) contributing up to 86% of the pollen. There were no significant effects from exposure to oilseed rape grown from thiamethoxam-treated seed from nest establishment through cell production to emergence under tunnel or field conditions. Environ Toxicol Chem 2018;37:1071-1083. © 2017 SETAC.

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Sex Ratio, Body Size and Seasonality in a Solitary Bee, Osmia lignaria propinqua Cresson (Hymenoptera: Megachilidae)

Cited by 61 publications

References 14 publications

Sex Ratio, Parental Investment, and Interparent Variability in Nesting Success in a Solitary Bee

Sex Ratio, Parental Investment, and Interparent Variability in Nesting Success in a Solitary Bee

When beggars are choosers—How nesting of a solitary bee is affected by temporal dynamics of pollen plants in the landscape

Effects of exposure to winter oilseed rape grown from thiamethoxam-treated seed on the red mason bee Osmia bicornis

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