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Intraguild predation among ladybeetles and a green lacewing: do the larval spines of Curinus coeruleus(Coleoptera: Coccinellidae) serve a defensive function?

Published online by Cambridge University Press:  09 March 2007

J.P. Michaud
Affiliation:
University of Florida, Citrus Research and Education Center, Lake Alfred, Florida 33850, USA
A.K. Grant
Affiliation:
University of Florida, Citrus Research and Education Center, Lake Alfred, Florida 33850, USA

Abstract

Laboratory experiments examined interspecific interactions between larvae of three coccinellid species, Curinus coeruleus Mulsant (Chilocorinae), Harmonia axyridis Pallas and Olla v-nigrum (Mulsant) (Coccinellinae), and between these and larvae of the green lacewing, Chrysoperla rufilabris (Burmeister). Larvae of C. coeruleus, although defended on their dorsal surface with long spines, had the smallest mandibles, were the slowest-moving, and the least successful in interspecific larval combat. The long spines of third instar C. coeruleusappeared to reduce their palatability as food to H. axyridis and O. v-nigrum larvae in choice tests with dead larvae, but were not an effective defence against these species in Petri dish arenas. Larvae of O. v-nigrum had a smooth dorsal surface, were intermediate in terms of mandible size, but were the fastest moving, a trait that benefited their survival in intraguild combat. Larvae of H. axyridis were intermediate with respect to dorsal spines and speed of movement, but had the largest mandibles. This species was the most effective intraguild combatant among the coccinellids and the only one to successfully compete against C. rufilabris larvae of similar age. The speed, manoeuverability and long mandibles of C. rufilabris enabled them to impale coccinellid larvae at a relatively safe distance. The spines of C. coeruleus larvae impeded laterally oriented attacks by C. rufilabris, but did not provide sustained protection from repeated attacks. Success in these interactions appeared largely a function of offensive weaponry (mandible size and morphology) and speed of movement, although the role of dorsal spines as defensive structures was not ruled out. Rates of larval cannibalism were highest for C. rufilabris and largely mirrored the level of aggression observed in interspecific combat for each species.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2003

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References

Arakaki, N. (1992) Predators of the sugar cane wooly aphid, Ceratovacuna lanigera (Homoptera: Aphididae), in Okinawa and predator avoidance of defensive attack by the aphid. Applied Entomology and Zoology 27, 159161.Google Scholar
Dixon, A.F.G. (2000) Cannibalism. pp. 130150 in Insect predator-prey dynamics: ladybird beetles and biological control. Cambridge, Cambridge University Press.Google Scholar
Duelli, P. (1981) Is larval cannibalism in lacewings adaptive? (Neuroptera: Chrysopidae). Researches in Population Ecology 23, 193209.CrossRefGoogle Scholar
Hodek, I. & Honek, A. (1996) Ecology of Coccinellidae. 464 pp. Dordrecht, The Netherlands, Kluwer Academic Publishers.CrossRefGoogle Scholar
Kaneko, S. (2002) Aphid-attending ants increase the number of emerging adults of the aphid's primary parasitoid and hyperparasitoids by repelling intraguild predators. Entomological Science 5, 131146.Google Scholar
Michaud, J.P. (2001) Evaluation of green lacewings, Chrysoperla plorabunda (Fitch) for augmentative release against Toxoptera citricida (Homoptera: Aphididae) in citrus. Journal of Applied Entomology 125, 383388.CrossRefGoogle Scholar
Michaud, J.P. (2002a) Biological control of Asian citrus psyllid in Florida: a preliminary report. Entomological News 113, 216222.Google Scholar
Michaud, J.P. (2002b) Invasion of the Florida citrus ecosystem by Harmonia axyridis (Coleoptera: Coccinellidae) and asymmetric competition with a native species, Cycloneda sanguinea. Environmental Entomology 31, 827835.Google Scholar
Michaud, J.P. (2003) A comparative study of larval cannibalism in three species of ladybird. Ecological Entomology 28, 92101.CrossRefGoogle Scholar
Phoofolo, M.W. & Obrycki, J.J. (1998) Potential for intraguild predation and competition among predatory Coccinellidae and Chrysopidae. Entomologia Experimentalis et Applicata 89, 4755.Google Scholar
Pope, R.D. (1979) Wax production by coccinellid larvae. Systematic Entomology 4, 171197.CrossRefGoogle Scholar
Samways, M.J. (1983) Interrelationship between an entomogenous fungus and two ant-homopteran (Hymenoptera: Formicidae-Hemiptera: Pseudococcidae and Aphididae) mutualisms on guava trees. Bulletin of Entomological Research 73, 321331.CrossRefGoogle Scholar
Völkl, W. & Vohland, K. (1996) Wax covers in larvae of two Scymnus species: do they enhance coccinellid larval survival? Oecologia 107, 498503.Google Scholar