Resting metabolism and critical thermal maxima of vespine wasps (Vespula sp.)

Käfer, Helmut; Kovac, Helmut; Stabentheiner, Anton

doi:10.1016/j.jinsphys.2012.01.015

Cited by 27 publications

(43 citation statements)

References 69 publications

(148 reference statements)

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“…As the combination of respirometry data and activity detection had shown the most accurate results in previous studies concerning the upper thermal maximum (Klok et al 2004; Lighton and Turner 2004; Stevens et al 2010; Käfer et al 2012); respiration and activity as well as body surface temperatures were assessed simultaneously via flow-through respirometry and infrared thermography (Stabentheiner et al 2012). The critical thermal maximum (CT max ) of 20 adult females of each species was assessed following a standardized method of driving a temperature ramp from 25° to 55 °C at a dT = 0.25 °C min −1 (see e.g.…”

Section: Methodsmentioning

confidence: 99%

“…We used thermal ramping to ensure that our data provide ecologically relevant measures of thermal tolerance (see Terblanche et al 2011) and remain comparable to a broad set of insect studies. For detailed information on the procedure, see Stabentheiner et al (2012), Käfer et al (2012) and chapter 6 in Hartfelder et al (2013). …”

Section: Methodsmentioning

confidence: 99%

“…To determine the wasps’ resting metabolic rate (RMR or standard metabolic rate), we measured the carbon dioxide emission using flow-through respirometry as previously described by Käfer et al (2012, 2015). The experiments described here were conducted according to the same procedure with the same experimental setup (see also Stabentheiner et al 2012).…”

Section: Methodsmentioning

confidence: 99%

“…A combination of this technique with conventional behavioural assessment of the critical thermal maximum (activity CT max ), e.g., by using detection of movement by means of video analysis or infrared diode actigraphy, objectively pinpoints the exact temperature of short-term physiological failure (see e.g. Klok et al 2004; Lighton and Turner 2004; Stevens et al 2010; Käfer et al 2012). …”

Section: Introductionmentioning

confidence: 99%

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Comparison of thermal traits of Polistes dominula and Polistes gallicus, two European paper wasps with strongly differing distribution ranges

et al. 2016

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The two paper wasps, Polistes dominula and Polistes gallicus, are related species with strongly differing distribution ranges. We investigated thermal tolerance traits (critical thermal limits and metabolic response to temperature) to gain knowledge about physiological adaptations to their local climate conditions and to get evidence for the reasons of P. dominula’s successful dispersion. Body and ambient temperature measurements at the nests revealed behavioural adaptations to microclimate. The species differed clearly in critical thermal minimum (P. dominula −1.4 °C, P. gallicus −0.4 °C), but not significantly in critical thermal maximum of activity (P. dominula 47.1 °C, P. gallicus 47.6 °C). The metabolic response did not reveal clear adaptations to climate conditions. At low and high temperatures, the metabolic rate of P. dominula was higher, and at intermediate temperatures, we determined higher values in P. gallicus. However, the species exhibited remarkably differing thermoregulatory behaviour at the nest. On average, P. gallicus tolerated a thoracic temperature up to ~41 °C, whereas P. dominula already tried at ~37 °C to keep the thorax below ambient temperature. We suggest this to be an adaptation to the higher mean ambient temperature we measured at the nest during a breeding season. Although we determined for P. dominula a 0.5 °C larger thermal tolerance range, we do not presume this parameter to be solely responsible for the successful distribution of P. dominula. Additional factors, such as the thermal tolerance of the queens could limit the overwintering success of P. gallicus in a harsher climate.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of thermal traits of Polistes dominula and Polistes gallicus, two European paper wasps with strongly differing distribution ranges

et al. 2016

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“…High temperatures stimulate the movement of insects within the grain mass, allowing them greater contact with the diatomaceous earth (Chanbang et al, 2007;). In addition to that, the upper threshold of temperature for each specimen can cause changes in the respiratory rate of the insects (Käfer et al, 2012), causing higher loss of water through spiracles and, consequently, the dissection and death (Vayias & Stephou, 2009).…”

Section: Resultsmentioning

confidence: 99%

Bioactivity of diatomaceous earth to Sitophilus zeamais (Coleoptera: Curculionidae) in different application conditions

Sousa¹,

Faroni²,

Andrade

et al. 2013

Rev. bras. eng. agríc. ambient.

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The objective of this study was to evaluate the insecticidal activity of diatomaceous earth (DE) at different ambient temperatures on adult Sitophilus zeamais and progeny, using different doses and exposure periods. The experiments were performed in Petri dishes containing 40 g of the whole corn kernel, treated with DE at doses of 0, 0.25, 0.5 and 1.0 kg Mg -1 . Each dish was infested with 25 S. zeamais adults and kept at climatic chambers under temperatures of 20, 25, 30, 35 and 40 o C. The insect mortality was recorded after six and 15 days from the beginning of the bioassays. The grains evaluated at 15 days were separated from insects and kept in the dishes for another 75 days under the same temperature conditions. After this period the effect of ambient temperature and of diatomaceous earth doses on the emergence of S. zeamais in the F 1 generation was evaluated. It was found that the mortality of S. zeamais increased with the higher dose and temperature during the exposure period of six and 15 days. The number of insects emerged reduced with increasing temperature in these two exposure periods. The increase of temperature and exposure period favored the efficacy of DE in lower doses for control of S. zeamais.Key words: corn weevil, inert dusts, storage, insect control Bioatividade da terra de diatomácea para Sitophilus zeamais (Coleoptera: Curculionidae) em diferentes condições de aplicação RESUMO O objetivo deste trabalho foi avaliar a atividade inseticida da terra de diatomácea (TD) em diferentes temperaturas ambiente sobre adultos de Sitophilus zeamais e sua progênie, utilizando-se diferentes doses e períodos de exposição. Os experimentos foram realizados em placas de Petri contendo 40 g de grãos inteiros de milho, tratados com TD nas doses de 0; 0,25; 0,5 e 1,0 kg Mg -1 . Cada placa foi infestada com 25 adultos de S. zeamais e mantida em câmaras climáticas nas temperaturas de 20, 25, 30, 35 e 40 °C. A mortalidade dos insetos foi contabilizada após seis e 15 dias do início dos bioensaios. Os grãos avaliados aos 15 dias foram separados dos insetos e mantidos nas placas por mais 75 dias sob as mesmas condições de temperatura. Após este período avaliou-se o efeito da temperatura ambiente e das doses da TD sobre a emergência de S. zeamais na geração F 1 . Verificou-se que a mortalidade de S. zeamais aumentou com o incremento da dose e da temperatura nos períodos de exposição de seis e 15 dias; já o número de insetos emergidos reduziu com o aumento da temperatura nesses dois períodos de exposição. O aumento da temperatura e do período de exposição favoreceu a eficácia da TD em menores doses, para controle de S. zeamais.Palavras-chave: gorgulho-do-milho, pós-inertes, armazenamento, controle de insetos

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What do foraging wasps optimize in a variable environment, energy investment or body temperature?

2015

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Vespine wasps (Vespula sp.) are endowed with a pronounced ability of endothermic heat production. To show how they balance energetics and thermoregulation under variable environmental conditions, we measured the body temperature and respiration of sucrose foragers (1.5 M, unlimited flow) under variable ambient temperature (Ta = 20–35 °C) and solar radiation (20–570 W m−2). Results revealed a graduated balancing of metabolic efforts with thermoregulatory needs. The thoracic temperature in the shade depended on ambient temperature, increasing from ~37 to 39 °C. However, wasps used solar heat gain to regulate their thorax temperature at a rather high level at low Ta (mean Tthorax ~ 39 °C). Only at high Ta they used solar heat to reduce their metabolic rate remarkably. A high body temperature accelerated the suction speed and shortened foraging time. As the costs of foraging strongly depended on duration, the efficiency could be significantly increased with a high body temperature. Heat gain from solar radiation enabled the wasps to enhance foraging efficiency at high ambient temperature (Ta = 30 °C) by up to 63 %. The well-balanced change of economic strategies in response to environmental conditions minimized costs of foraging and optimized energetic efficiency.Electronic supplementary materialThe online version of this article (doi:10.1007/s00359-015-1033-4) contains supplementary material, which is available to authorized users.

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Resting metabolism and critical thermal maxima of vespine wasps (Vespula sp.)

Cited by 27 publications

References 69 publications

Comparison of thermal traits of Polistes dominula and Polistes gallicus, two European paper wasps with strongly differing distribution ranges

Comparison of thermal traits of Polistes dominula and Polistes gallicus, two European paper wasps with strongly differing distribution ranges

Bioactivity of diatomaceous earth to Sitophilus zeamais (Coleoptera: Curculionidae) in different application conditions

What do foraging wasps optimize in a variable environment, energy investment or body temperature?

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