INTERFERENCE COMPETITION IN ANT-LION (MACROLEON-QUINQUEMACULATUS) LARVAE

D Griffiths

    Research output: Contribution to journalArticle

    31 Citations (Scopus)

    Abstract

    1. The effects of density, feeding regime, and body size on interference competition in the pit-digging larvae of the ant-lion Macroleon quinquemaculatus (Hagen) were investigated in laboratory experiments. 2. Competition had little effect on the pit size of winners but losers constructed much smaller pits than isolated larvae. Losers were less likely to dig or maintain pits and more likely to move than winners. 3. Competition was much stronger between well-fed larvae than between hungry ones, and well-fed competitors showed reduced growth rates. Well-fed larvae orientated themselves so that they could throw sand into their neighbour's pit whereas hungry larvae faced away from each other. Differences in hunger level reversed the competitive advantage of larger larvae only when individuals were of similar size. 4. Cannibalism was density-dependent and most frequent in hungry, similar-sized, larvae; the smaller larva was usually the victim. 5. Displays/challenges between larvae affected the distance between pits. Body size was the main determinant of contest outcome though pit ownership and hunger level also had an effect.
    LanguageEnglish
    Pages219-226
    JournalEcological Entomology
    Volume17
    Issue number3
    Publication statusPublished - Aug 1992

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    Myrmeleontidae
    larvae
    hunger
    body size
    cannibalism
    ownership
    sand

    Cite this

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    title = "INTERFERENCE COMPETITION IN ANT-LION (MACROLEON-QUINQUEMACULATUS) LARVAE",
    abstract = "1. The effects of density, feeding regime, and body size on interference competition in the pit-digging larvae of the ant-lion Macroleon quinquemaculatus (Hagen) were investigated in laboratory experiments. 2. Competition had little effect on the pit size of winners but losers constructed much smaller pits than isolated larvae. Losers were less likely to dig or maintain pits and more likely to move than winners. 3. Competition was much stronger between well-fed larvae than between hungry ones, and well-fed competitors showed reduced growth rates. Well-fed larvae orientated themselves so that they could throw sand into their neighbour's pit whereas hungry larvae faced away from each other. Differences in hunger level reversed the competitive advantage of larger larvae only when individuals were of similar size. 4. Cannibalism was density-dependent and most frequent in hungry, similar-sized, larvae; the smaller larva was usually the victim. 5. Displays/challenges between larvae affected the distance between pits. Body size was the main determinant of contest outcome though pit ownership and hunger level also had an effect.",
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    language = "English",
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    INTERFERENCE COMPETITION IN ANT-LION (MACROLEON-QUINQUEMACULATUS) LARVAE. / Griffiths, D.

    In: Ecological Entomology, Vol. 17, No. 3, 08.1992, p. 219-226.

    Research output: Contribution to journalArticle

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    T1 - INTERFERENCE COMPETITION IN ANT-LION (MACROLEON-QUINQUEMACULATUS) LARVAE

    AU - Griffiths, D

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    N2 - 1. The effects of density, feeding regime, and body size on interference competition in the pit-digging larvae of the ant-lion Macroleon quinquemaculatus (Hagen) were investigated in laboratory experiments. 2. Competition had little effect on the pit size of winners but losers constructed much smaller pits than isolated larvae. Losers were less likely to dig or maintain pits and more likely to move than winners. 3. Competition was much stronger between well-fed larvae than between hungry ones, and well-fed competitors showed reduced growth rates. Well-fed larvae orientated themselves so that they could throw sand into their neighbour's pit whereas hungry larvae faced away from each other. Differences in hunger level reversed the competitive advantage of larger larvae only when individuals were of similar size. 4. Cannibalism was density-dependent and most frequent in hungry, similar-sized, larvae; the smaller larva was usually the victim. 5. Displays/challenges between larvae affected the distance between pits. Body size was the main determinant of contest outcome though pit ownership and hunger level also had an effect.

    AB - 1. The effects of density, feeding regime, and body size on interference competition in the pit-digging larvae of the ant-lion Macroleon quinquemaculatus (Hagen) were investigated in laboratory experiments. 2. Competition had little effect on the pit size of winners but losers constructed much smaller pits than isolated larvae. Losers were less likely to dig or maintain pits and more likely to move than winners. 3. Competition was much stronger between well-fed larvae than between hungry ones, and well-fed competitors showed reduced growth rates. Well-fed larvae orientated themselves so that they could throw sand into their neighbour's pit whereas hungry larvae faced away from each other. Differences in hunger level reversed the competitive advantage of larger larvae only when individuals were of similar size. 4. Cannibalism was density-dependent and most frequent in hungry, similar-sized, larvae; the smaller larva was usually the victim. 5. Displays/challenges between larvae affected the distance between pits. Body size was the main determinant of contest outcome though pit ownership and hunger level also had an effect.

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