Effect of Population Size on Brood Production, Worker Survival and Honey Gain in Colonies of Honeybees

Harbo, John R.

doi:10.1080/00218839.1986.11100687

Cited by 105 publications

(88 citation statements)

References 9 publications

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“…Farrar (1973) and Harbo (1986) showed that large populations are more efficient honey producers and yield more honey per bee but use less per bee over winter. Therefore, a bigger colony, having more foragers and in-nest bees, could allow a better observation of the effects of the pesticide because of the higher number of bees involved.…”

Section: Choice Of the Coloniesmentioning

confidence: 99%

Scientific Opinion on the science behind the development of a risk assessment of Plant Protection Products on bees (Apis mellifera,Bombusspp. and solitary bees)

2012

EFSA Journal

157

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The PPR Panel was asked to deliver a scientific opinion on the science behind the development of a risk assessment of plant protection products on bees (Apis mellifera, Bombus spp. and solitary bees). Specific protection goals options were suggested based on the ecosystem services approach. The different routes of exposure were analysed in detail for different categories of bees. The existing test guidelines were evaluated and suggestions for improvement and further research needs were listed. A simple prioritisation tool to assess cumulative effects of single pesticides using mortality data is suggested. Effects from repeated and simultanous exposure and synergism are discussed. Proposals for separate risk assessment schemes, one for honey bees and one for bumble bees and solitary bees, were developed. © European Food Safety Authority, 2012 KEY WORDSGuidance Document, PPR opinion, honey bees, bumble bees, solitary bees, pesticide, risk assessment (2010). Pollination, hive products (for honey-bees only) and biodiversity (specifically addressed under genetic resources and cultural services) were identified as relevant ecosystem services. It was suggested to define the attributes to protect as survival and development of colonies and effects on larvae and honey bee behaviour as listed in regulation (EC) No 1107/2009. In addition, abundance/biomass and reproduction were also suggested because of their importance for the development and long-term survival of colonies. The magnitude of effects was defined as negligible if the natural background mortality compared to controls was not exceeded. Further work is needed to give recommendations on the deviation from the controls up to which an effect is still considered negligible. The current methods of field testing would need major improvements in order to detect for example an increase in daily mortality of foragers by 10% with high statistical power. Based on expert judgement it was considered that a small effect could be tolerated for few days without putting the survival of a hive at risk. Further research (modelling) is proposed to clarify this question and to revise the proposal for the magnitude of effects and the temporal scale of effects. The current risk assessment for honey bees relies on an Hazard Quotient (HQ) approach (application rate/LD50) in lower tiers and on semi-field and field tests in higher tiers. It is particularly difficult to ascertain whether a specific exposure percentile is achieved in field studies. Decisions need to be taken on how conservative the exposure estimate should be and what percentage of exposure situations should be covered in the risk assessment. It is recommended to design a flow chart for checking whether exposure in the semi-field or field study was indeed higher than that corresponding to the desired percentile. Factors that may be included are: the crop and its developmental stage, the dosage, measures ensuring that bees are coming into contact with the compound/formulation, weather conditions, and for instance t...

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Section: Choice Of the Coloniesmentioning

confidence: 99%

Scientific Opinion on the science behind the development of a risk assessment of Plant Protection Products on bees (Apis mellifera,Bombusspp. and solitary bees)

2012

EFSA Journal

157

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“…honey production -Canada — colony size Résumé — Influence de la production de couvain et de la taille de la population sur la production de (Harbo, 1986) and average productive life of workers (Woyke, 1981 and1984) (Table I), giving a total for both periods of 62 400 (Table II). There were no significant differences in the number of worker brood cells when the ages of the queens, yards, or years were compared.…”

mentioning

confidence: 99%

Effect of brood production and population size on honey production of honeybee colonies in Alberta, Canada

Szabó¹,

Lefkovitch²

1989

Apidologie

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“…Thus, as the increasing quantity of pollen collected is significantly correlated to the queen's ovipositing rate (CALE, 1967) and with brood area (TODD & REED, 1970), these hives would turn out more populous. As there is also a positive correlation between the size of the population of a hive and its honey production (HARBO, 1986), it is possible that the explanation for the correlation detected here is, indeed, the one proposed by MILNE & PRIES (1984).…”

Section: Resultsmentioning

confidence: 54%

“…The corbicula -area where worker bees carry pollen to the colony -is related to their capacity of carrying greater quantities of pollen (MILNE & PRIES, 1984, 1986. Pollen, which is the chief source of protein for bees, is indispensable for the development of the colony.…”

Section: Introductionmentioning

confidence: 99%

Correlation between honey production and some morphological traits in africanized honey bees (Apis melifera)

et al. 2002

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Effect of Population Size on Brood Production, Worker Survival and Honey Gain in Colonies of Honeybees

Cited by 105 publications

References 9 publications

Scientific Opinion on the science behind the development of a risk assessment of Plant Protection Products on bees (Apis mellifera,Bombusspp. and solitary bees)

Scientific Opinion on the science behind the development of a risk assessment of Plant Protection Products on bees (Apis mellifera,Bombusspp. and solitary bees)

Effect of brood production and population size on honey production of honeybee colonies in Alberta, Canada

Correlation between honey production and some morphological traits in africanized honey bees (Apis melifera)

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