Non-carnivorous Insects Flashcards

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1
Q

define insect cannibalism

A

the killing and consumption of a conspecific

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2
Q

what orders is insect cannibalism seen in

A
  • odonata
  • orthoptera
  • hemiptera
  • lepidoptera
  • diptera
  • neuroptera
  • coleoptera
  • hymenoptera
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3
Q

what are the types of insect cannibalism

A
  • filial cannibalism
  • sibling cannibalism
  • intrauterine cannibalism
  • sexual cannibalism
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4
Q

why may an insect undergo insect cannibalism

A
  • overcrowding, artificial diet, and starvation
  • cannibalism also reduces intraguild predation
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5
Q

define intraguild predation

A

the combination of predation and competition where one insect kills and eats its predator

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6
Q

explain influencing factors of non-carnivorous insects engaging in carnivorous tendencies

A
  • density-dependent factors
  • high temperature
  • low humidity
  • precipitation
  • asynchrony with the host plant
  • poor nutritional quality of the host diet
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7
Q

patterns of non-carnivorous insects - eating and size of prey relationship

A
  • insects are more likely to cannibalize smaller conspecifics
  • they may attack larger ones but only if they are infected, injured, or inactive
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8
Q

patterns of non-carnivorous insects - egg laying

A
  • they are more likely to lay their eggs in large masses rather than singly
  • bc if they are many of them together, it is more likely that they will cannibalize each other
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9
Q

explain how cannibalism may be a bad evolutionary strategy

A

insects may eat their own broods thus not passing genes to the next generation

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10
Q

explain how cannibalism may be a good evolutionary strategy

A

by eliminating conspecifics that are infected with pathogens, less fit individuals are eliminated, increasing the overall fitness

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