Food availability controls the onset of metamorphosis in the dung beetle Onthophagus taurus (Coleoptera: Scarabaeidae)

  title={Food availability controls the onset of metamorphosis in the dung beetle Onthophagus taurus (Coleoptera: Scarabaeidae)},
  author={Majid Shafiei and Armin P. Moczek and H. Frederik Nijhout},
  journal={Physiological Entomology},
In nature, larvae of the dung beetle Onthophagus taurus (Schreber 1759) are confronted with significant variation in the availability of food without the option of locating new resources. Here we explore how variation in feeding conditions during the final larval instar affects larval growth and the timing of pupation. We found that larvae respond to food deprivation with a reduction in the length of the instar and premature pupation, leading to the early eclosion of a small adult. To achieve… 

Food‐availability dependent premature metamorphosis in the bean blister beetle Epicauta gorhami (Coleoptera: Meloidae), a hypermetamorphic insect that feeds on grasshopper eggs in the larval stage

Feeding conditions do not affect pupation success, but do affect the tendency to pupate or pseudopupate in E. gorhami, the first report of the occurrence of premature pupation in carnivorous insects.

Feeding performance of the larval stag beetle Aegus chelifer (Coleoptera: Lucanidae) explains adult body size variation and sexual dimorphism

Feeding period, total food consumption, and adult body size significantly increased alongside food quantity, and males showed greater variation in feeding, growth performance, andadult body size than females.

A method for rearing the yellow-spotted longicorn beetle, Psacothea hilaris (Coleoptera: Cerambycidae), to stabilize the last larval instar

This rearing technique will expedite studies on the control of metamorphosis in P. hilaris and change in the photoperiod from a short to a long day with appropriate timing may assist in obtaining physiologically homogeneous larvae that pupate at the next molt.

Effect of larval crowding on the life history traits of Sesamia nonagrioides (Lepidoptera: Noctuidae)

It is concluded that crowding related changes during larval development directly affect larval life and reduce female fitness and larval density may affect the allocation of food resources and adult fitness.

Threshold weight for starvation-triggered metamorphosis in the yellow-spotted longicorn beetle, Psacothea hilaris (Coleoptera: Cerambycidae)

The relationships between the weight changes of experimental larvae during starvation and their pupation success suggested the threshold weight for metamorphosis to be 180 mg, and the adaptive significance of premature pupation in starved P. hilaris is discussed.

Larval growth rates and sexual differences of resource allocation in the cetoniine scarab Mecynorhina polyphemus Fabricius 1781 (Coleoptera: Scarabaeidae: Goliathini)

There is a strong correlation in both sexes between maximal larval mass and the mass of the imago, but larval Mass–imago mass scales with significantly different slopes in males and females.

Nesting biology and life history of the dung beetle Onthophagus lecontei (Coleoptera: Scarabaeinae)

The nesting behavior of beetles was observed under laboratory conditions and the preimaginal development of individuals obtained from mating was described, finding their nesting behavior to be characteristic of what is known as pattern I.



Initiation of Metamorphosis in the Pitcher‐Plant Mosquito: Effects of Larval Growth History

Models originally formulated in an amphibian context are used to examine the effects of modified larval growth on the triggering of metamorphosis and then used to reexamine meetamorphosis in amphibians and find an insect-derived model involving the effectsof size-specific growth increments is more consistent than any amphibian model.

Life History Significance of Size‐Triggered Metamorphosis in Milkweed Bugs (Oncopeltus)

Achievement of a critical body size provides the proximate stimulus for the metamor- phic molt in Oncopeltus and other hemimetabolous and holometabolous insects. Effects of size- dependent stimuli on

Growth and Retrogression in Larvae of Trogoderma glabrum (Coleoptera: Dermestidae). 1. Characteristics under Feeding and Starvation Conditions

These characteristics were interpreted as suggesting that the physiological mechanisms controlling the molting cycle were relatively independent of those controlling metabolism and weight loss.

Starvation effects on the endocrine control of metamorphosis in the small wax moth, Galleria mellonella [Lepidoptera: Pyralidae]

Effects of starvation on late larval development was studied in Galleria mellonella and possible causal relationships with brain allatotropic activity and juvenile hormone degradation by specific esterases were evidenced and discussed.

A threshold size for metamorphosis in the tobacco hornworm, Manduca sexta (L.).

It was concluded that larvae of Manduca simply continue to grow and molt until they reach or exceed a sharply defined threshold size (corresponding to a head capsule size of 5.1 mm), and the final larval instar during which the corpora allata will be...

Plasticity in Metamorphic Traits of Natterjack Tadpoles: The Interactive Effects of Density and Pond Duration

The outcome does not support an adaptive explanation of developmental plasticity that merely may be the consequence of expressing a single program of development in different habitats.

Brood care in the dung beetle Onthophagus vacca (Coleoptera: Scarabaeidae): the effect of soil moisture on time budget, nest structure, and reproductive success

Be Beetles emerging from chambers in dry, sand were smaller than those emerging from moist sand even if the amount of dung supply was equal, and offspring size was not only influenced by dung provision in the brood chaimbers.

Growth and Retrogression in Larvae of Trogoderma glabrum (Coleoptera: Dermestidae). 4. Developmental Characteristics and Adaptive Functions

The responses of the larvae showed that retrogression led to a requirement not only for food but also for long-day photoperiods and the presence of males as stimuli inducing pupation of female larvae, and the Dauer condition did not in itself influence competence to pupate.

Horn polyphenism in the beetle Onthophagus taurus: larval diet quality and plasticity in parental investment determine adult body size and male horn morphology

It is demonstrated that natural variation in both the quantity and quality of food that larvae receive from their parents determines body size in males and females, and, by means of a threshold response, the presence or absence of horns in males.