Behavioural responses to warming differentially impact survival in introduced and native dung beetles

Mamantov, Margaret A.; Sheldon, Kimberly S.

doi:10.1111/1365-2656.13366

Cited by 20 publications

(36 citation statements)

References 75 publications

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“…Despite being buried deeper in the soil, brood balls from the greenhouse treatment were placed in warmer mean temperatures. Warmer temperatures during offspring development can result in faster development rates, smaller adult body sizes, and depending on the temperature, lower survival (Macagno et al, 2018;Pettersen et al, 2019;Mamantov & Sheldon, 2021). However, the mean temperatures experienced by P. vindex brood balls in the greenhouse treatment (26.6 °C) and control (26 °C) buckets are well below the temperatures that lead to high rates of mortality in other dung beetle offspring (Macagno et al, 2018;Mamantov & Sheldon, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…In ectotherms, reproductive behaviors of adults greatly influence the thermal environment in which offspring development takes place with consequences for phenotype and fitness (Telemeco et al, 2017;Macagno et al, 2018;Holley & Andrew, 2019;Mamantov & Sheldon, 2021). The temperatures experienced during development have profound effects on ectotherm metabolism, development rate, and body size of adults (Kingsolver et al, 2004;Ragland et al, 2008;Woods, 2009;Klok & Harrison, 2013;Pettersen et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In many ectotherms, early life stages (e.g., eggs) are sessile and developing offspring cannot move to more favorable microclimates (Huey et al, 2012). Adjustments by adults in nesting location can alter the developmental environment of offspring with impacts on offspring survival and fitness (Snell-Rood et al, 2016;Telemeco et al, 2017;Macagno et al, 2018;Mamantov & Sheldon, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Maternal behavior during reproduction, including brood ball size and burial depth, shapes the environmental conditions of the offspring with consequences for survival and fitness (Hunt & Simmons, 2000Moczek & Emlen, 2000;Snell-Rood et al, 2016;Macagno et al, 2018;Mamantov & Sheldon, 2021). Because dung from the brood ball provides the only nourishment available to developing larvae, the size of the brood ball can affect adult body size upon emergence (Lee & Peng, 1981;Moczek & Emlen, 1999;Shafiei et al, 2001;Kishi & Nishida, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Burial depth impacts the temperature experienced by offspring in the brood ball; offspring in brood balls near the soil surface experience warmer, more variable temperatures than those at greater soil depths (Snell-Rood et al, 2016). In ectotherms, warmer temperatures are associated with faster development rates, smaller body sizes, and reduced survival (Chown & Terblanche, 2006;Angilletta, 2009;Colinet et al, 2015;Mamantov & Sheldon, 2021). However, few studies have examined the capacity for behavioral plasticity to mediate the types of temperature changes occurring with climate change (Refsnider et al, 2013;Telemeco et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Experimental increases in temperature mean and variance alter reproductive behaviors in the dung beetlePhanaeus vindex

Sheldon

2021

Preprint

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Temperature profoundly impacts insect development, but plasticity of reproductive behaviors may mediate the impacts of temperature change on earlier life stages. Few studies have examined the potential for behavioral plasticity of adults to buffer developing offspring from warmer, more variable temperatures associated with climate change. We used a field manipulation to examine whether the dung beetle Phanaeus vindex alters breeding behaviors in response to climate change and whether adult behavioral shifts protect offspring from temperature increases. Dung beetles lay eggs inside brood balls made of dung that are buried underground for the entirety of offspring development. Depth of the brood ball impacts the temperatures offspring experience with consequences for beetle development. We placed females in either control or greenhouse treatments that simultaneously increased temperature mean and variance. We found that females produced smaller brood balls but buried them deeper in the greenhouse treatment, suggesting burial depth may come at a cost to brood ball size, which can impact offspring nutrition. Despite being buried deeper, brood balls from the greenhouse treatment experienced warmer mean temperatures but similar amplitudes of temperature fluctuation relative to the controls. Our findings suggest adult behaviors may buffer offspring from increased temperature variation due to climate change.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental increases in temperature mean and variance alter reproductive behaviors in the dung beetlePhanaeus vindex

Sheldon

2021

Preprint

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Morphometric changes on dung beetle Dichotomius problematicus (Coleoptera: Scarabaeidae: Scarabaeinae) related to conversion of forest into grassland: A case of study in the Ecuadorian Amazonia

Marín-Armijos

Chamba‐Carrillo

Pedersen

2023

Ecology and Evolution

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The conversion of forest into grassland can induce differentiation in the functional morphology of resilient species. To assess this effect, we have chosen a dung beetle Dichotomius problematicus, as a model species. We established 20 sampling points distributed along a transect for a forest and grassland located in the Podocarpus National Park in Ecuador. Four pit‐fall traps were baited with pig feces per sample point and were left open for 48 h. We sexed and measured 13 morphological traits of 269 individuals. Nonmetric multidimensional scaling was carried out to evaluate the influence of habitat and sexual dimorphism on the traits. We applied a principal component analysis to evaluate the morphological features that best explain the differences between land use and sexual dimorphism. We used generalized linear models to evaluate the explanatory variables: habitat and sexual dimorphism with respect to morphological traits. Five traits contributed over 70% body thickness, Pronotum width, Pronotum length, Head width and Elytra length, following the results of a principal component analysis. Both habitat and sex influence traits. In the forest, the individuals are larger than grassland likely due to available resources, but in grassland, the structures in charge of the burial process head, protibia are larger, displaying a strong pronotum and possible a greater reproductive capacity given by spherecity. These patterns of changes in the size of beetles and their structures could reflect the conservation state of an ecosystem.

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Diurnal temperature variation impacts energetics but not reproductive effort across seasons in a temperate dung beetle

Fleming,

Marshall,

Coverley

et al. 2024

Ecology

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Temperature varies on multiple timescales and ectotherms must adjust to these changes to survive. These adjustments may lead to energetic trade‐offs between self‐maintenance and reproductive investment. However, we know little about how diurnal and seasonal temperature changes impact energy allocation. Here we used a combination of empirical data and modeling of both thermoregulatory behaviors and body temperature to examine potential energetic trade‐offs in the dung beetle Onthophagus taurus. Beginning in March 2020, universities and laboratories were officially closed due to the COVID‐19 pandemic. We thus performed experiments at a private residence near Knoxville, Tennessee, USA, leveraging the heating, ventilation and air conditioning of the home to manipulate temperature and compare beetle responses to stable indoor temperatures versus variable outdoor temperatures. We collected O. taurus beetles in the early‐, mid‐, and late‐breeding seasons to examine energetics and reproductive output in relation to diurnal and seasonal temperature fluctuations. We recorded the mass of field fresh beetles before and after a 24‐h fast and used the resulting change in mass as a proxy for energetic costs of self‐maintenance across seasons. To understand the impacts of diurnal fluctuations on energy allocation, we held beetles either indoors or outdoors for 14‐day acclimation trials, fed them cow dung, and recorded mass change and reproductive output. Utilizing biophysical models, we integrated individual‐level biophysical characteristics, microhabitat‐specific performance, respirometry data, and thermoregulatory behaviors to predict temperature‐induced changes to the allocation of energy toward survival and reproduction. During 24 h of outdoor fasting, we found that beetles experiencing reduced temperature variation lost more mass than those experiencing greater temperature variation, and this was not affected by season. By contrast, during the 14‐day acclimation trials, we found that beetles experiencing reduced temperature variation (i.e., indoors) gained more mass than those experiencing greater temperature variation (i.e., outdoors). This effect may have been driven by shifts in the metabolism of the beetles during acclimation to increased temperature variation. Despite the negative relationship between temperature variation and energetic reserves, the only significant predictor of reproductive output was mean temperature. Taken together, we find that diurnal temperature fluctuations are important for driving energetics, but not reproductive output.

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Behavioural responses to warming differentially impact survival in introduced and native dung beetles

Cited by 20 publications

References 75 publications

Experimental increases in temperature mean and variance alter reproductive behaviors in the dung beetlePhanaeus vindex

Experimental increases in temperature mean and variance alter reproductive behaviors in the dung beetlePhanaeus vindex

Morphometric changes on dung beetle Dichotomius problematicus (Coleoptera: Scarabaeidae: Scarabaeinae) related to conversion of forest into grassland: A case of study in the Ecuadorian Amazonia

Diurnal temperature variation impacts energetics but not reproductive effort across seasons in a temperate dung beetle

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