Summary
Colony defense in some aphids is performed by sterile soldiers but in others by monomorphic larvae of a specific instar stage. This paper, focusing on a galling aphidHemipodaphis persimilis with monomorphic defensive first instars, examined the mechanism by which the proportion of defenders is regulated in the colonies. Demographic analyses showed that the ratios of first instars (defenders) were kept constantly high (58% on average) from mid June to late September. High proportions of first instars could be explained by consistently high birth rates (birth rate hypothesis) or by a prolonged duration of the first instar stage (instar span hypothesis).
With the progress of colony age, the mature-embryo content of apterous adults, used as an index of the birth rate, decreased and the proportions of advanced instars increased. These results did not support the birth rate hypothesis. By contrast, calculation of a newly proposed index, the molting rate, showed that the duration of the first-instar stage was short in incipient galls but became longer with colony age. The duration of other instar stages was always kept short. These results corroborate the instar span hypothesis and suggest that the prolongation of the first-instar stage is an adaptive mechanism by which the defender ratio is kept high in mature colonies where the birth rate is declining. The frequency of aggressive behavior in first instars increased from incipient to mature galls. Seasonal changes in the instar span and aggressiveness of first instars suggest that inH. persimilis colonies there is a strategic shift from the reproductive to defensive phase with colony age.
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References
Akimoto, S. (1989) Gall-invading behavior ofEriosoma aphids (Homoptera: Pemphigidae) and its significance.Jpn. J. Ent.,57: 210–220.
Aoki, S. (1978) Two pemphigids with first instar larvae attacking predatory intruders (Homoptera, Aphidoidea).New Entomol, Nagano,27: 7–12.
Aoki, S. (1982) Soldiers and altruistic dispersal in aphids. 154–158. In M. D. Breed, C. D. Michener and H. E. Evans (eds)The Biology of Social Insects. Westview Press, Boulder.
Aoki, S. (1987) Evolution of sterile soldiers in aphids. 53–65. In Y. Itô, J. L. Brown and J. Kikkawa (eds)Animal Societies: Theories and Facts. Japan Scientific Societies Press, Tokyo.
Aoki, S. and U. Kurosu (1986) Soldiers of a European gall aphid,Pemphigus spyrothecae (Homoptera: Aphidoidea): why do they molt.J. Ethol. 4: 97–104.
Aoki, S., S. Akimoto and Sk. Yamane (1981) Observations onPseudoregma alexanderi (Homoptera, Pemphigidae), an aphid species producing pseudoscorpion-like soldiers on bambooks.Kontyu, Tokyo,49: 355–366.
Arakaki, N. (1989) Alarm pheromone eliciting attack and escape responses in the sugar cane woolly aphid,Ceratovacuna lanigera (Homoptera, Pemphigidae).J. Ethol. 7: 83–90.
Barlow, N. D. and A. F. G. Dixon (1980)Simulation of Lime Aphid Population Dynamics. Centre for Agricultural Publishing and Documentation, Wageningen.
Blackman, R. (1987) Reproduction, cytogenetics and development. 163–195. In A. K. Minks and P. Harrewijn (eds),Aphids; Their Biology, Natural Enemies and Control. Vol A. Elsevier, Amsterdam.
Dixon, A. F. G. (1963) Reproductive activity of the sycamore aphid,Drepanosiphum platanoides (Schr.) (Hemiptera, Aphididae).J. Anim. Ecol. 32: 33–48.
Foster, W. A. (1990) Experimental evidence for effective and altruistic colony defence against natural predators by soldiers of the gall-forming aphidPemphigus spyrothecae (Hemiptera: Pemphigidae).Behav. Ecol. Sociobiol.,27: 421–430.
Hamilton, W. D. (1964) The genetical evolution of social behaviour. II.J. Theoret. Biol. 7: 17–52.
Hille Ris Lambers, D. (1966) Polymorphism in Aphididae.Ann. Rev. Entomol. 11: 47–77.
Hughes, R. D. (1963) Population dynamics of the cabbage aphid,Brevicoryne brassicae (L.).J. Anim. Ecol. 32: 393–424.
Itô, Y. (1989) The evolutionary biology of sterile soldiers in aphids.Tren. Ecol. Evol. 4: 69–73.
Kurosu, U. and S. Aoki (1988) Monomorphic first instar larvae ofColophina clematicola (Homoptera, Aphidoidea) attack predators.Kontyu, Tokyo,56: 867–871.
Llewellyn, M. and V. K. Brown (1985) The effect of host-plant species on adult weight and the reproductive potential of aphids.J. Anim. Ecol. 54: 639–650.
Noda, I. (1960) The emergence of winged viviparous female(s) in aphids(s). VI: Difference in the rate of development between the winged and unwinged forms.Jpn. J. Ecol. 10: 97–102.
Perrin, R. M. (1976) The population dynamics of the stinging nettle aphid,Microlophium carnosum (Bukt.).Ecol. Ent. 1: 31–40.
Sakata, K. and Y. Itô (1991) Life history characteristics and behaviour of the bamboo aphid,Pseudoregma bambusicola (Hemiptera: Pemphigidae), having sterile soldiers.Insectes Soc. 38: 317–326.
Sokal, R. R. and F. J. Rohlf (1981)Biometry, Second edition. W. H. Freeman and Company, New York.
Sunose, T., Sk. Yamane, K. Tsuda and K. Takasu (1991) What do the soldiers ofPseudoregma bambucicola (Homoptera, Aphidoidea) defend?Jpn. J. Entomol. 59: 141–148.
Way, M. J. (1968) Intra-specific mechanisms with special reference to aphid populations. 18–36. In T. R. E. Southwood (ed)Insect Abundance. Blackwell, Oxford.
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Akimoto, S. Shift in life-history strategy from reproduction to defense with colony age in the galling aphidHemipodaphis persimilis producing defensive first-instar larvae. Res Popul Ecol 34, 359–372 (1992). https://doi.org/10.1007/BF02514804
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DOI: https://doi.org/10.1007/BF02514804