Charlotte LR Payne
Charlotte LR Payne
  • About
  • Research
    • Traditional entomophagy in Japan >
      • An overview
      • Wild foraging and food insecurity
      • Imported insects compensate for a decline in wild foraging
    • The ‘semi domestication’ of wasps for use as food in contemporary Japan >
      • What can we learn from insect 'semi-domestication'?
    • Public health and edible insects
    • Wild and semi-wild harvesting in Zimbabwe
    • Wild harvesting in DRC
    • Gender roles in insect foraging and management
    • Edible insects in San Antonio Etlatongo, Oaxaca, Mexico
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Trophallaxis: Food sharing in giant hornets

9/12/2014

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Picture
The hornets shown in the picture above are both female, and no, they're not kissing - they're sharing food.

Many social insects practice trophallaxis (from the Greek: troph(o) means nourishment: all axis means exchange). In this behaviour, food that has been digested by one individual is passed on to another, either by oral-oral contact or even anal-oral contact (in termites, for example).

In giant hornets, the most well-known form of trophallaxis happens between larva and adult workers: The worker hornets bring small pieces of meat into the nest and feed these directly to the larvae. In return, the larvae secrete a nutrient-rich liquid that is ingested (mouth-to-mouth) by retuning workers. 

The amino acid content of this secretion is thought to be responsible for the worker hornets' ability to sustain their energy over long distance flights, and there is evidence that it has a similar effect on other animals such as mice, increasing their capacity for endurance exercise. Knowledge of the amino acid composition of this larval secretion has even been used to develop a sports nutrition drink specifically tailored to endurance athletes, VAAM (Vespa Amino Acid Mixture).

But what about the two hornets above? They are both workers. They arrived at this bottle of sugar water at different times, and initially seemed to fight mid-air. We presumed that they had come from different colonies, and were fighting for the food. But, after a few minutes of apparent aerial combat, they initiated trophollaxis, as shown above. Are they really from different nests? Is worker secretion similar in composition to larval secretion? There are many, many questions on this topic that are (as far as I know) yet to be researched! 
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Insects to Feed the World conference 2014: Talks and themes summarised in one 12-minute video

9/9/2014

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If you're interested in nutrition / edible insects / food security / development / animal feed / future trends in food production / etc :) Click here to view.

The video, courtesy of Eric Caikin, summarises a few of the many highlights of the Insects to Feed the World Conference held in May earlier this year. 
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Giant hornets! 

9/3/2014

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Picture
Today, thanks to Tetsuo-san, I saw my first giant hornet nest of 2014! As shown in the photo above, it's in a great position, easy to access and easy to see. 

Usually giant hornet collection season begins around October, which is when the nests are largest. But we might collect it sooner, at the end of September… watch this space!
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