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BIOCLIMATIC STUDIES OF THE APHID PARASITE PRAON EXSOLETUM: I. EFFECTS OF TEMPERATURE ON THE FUNCTIONAL RESPONSE OF FEMALES TO VARYING HOST DENSITIES

Published online by Cambridge University Press:  31 May 2012

P. S. Messenger
P. S. Messenger
Affiliation:
Division of Biological Control, University of California, Berkeley
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Abstract

Using bioclimatic chambers to provide diurnally fluctuating temperature and humidity conditions, the relationship between fecundity of females of the aphid parasite, Praon exsoletum (Nees), and different host densities, was examined over a wide range of mean temperatures. At each temperature level the number of eggs laid by females was found to vary with host density in accordance with the functional response curve (disc equation) of Holling. Superparasitism was common at all temperature levels studied, and, irrespective of host density, eggs were found laid at random with respect to hosts present. The functional response equation was thus modified so that number of hosts attacked was determined by both number of hosts present and number of eggs laid. Using this modified disc equation, the bioclimatic characteristics of parasite oviposition were examined from rhc standpoint of varying temperature levels. Oviposition was limited to mean temperatures between 8° and 29°C; near these limits the maximum number of eggs laid and the maximum number of hosts attacked were low. At medial mean temperatures (13°–24°) the number of eggs laid per parasite was high, averaging between 70 and 110 each 12-hour day. At these same medial temperatures, according to the modified disc equation, the average "handling" time per oviposition attack was shortest, and the parasite effective searching rate fastest. Averaged over a 12-hour day (this parasite does not oviposit in darkness), females of P. exsoletum were capable of laying from seven to nine eggs per hour at temperatures between 15° and 24° respectively. In all cases, the number of hosts attacked varied with numbers of eggs laid in accordance with Thompson’s superparasitism formula.

Type
Articles
Information
The Canadian Entomologist , Volume 100 , Issue 7 , July 1968 , pp. 728 - 741
Copyright
Copyright © Entomological Society of Canada 1968

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References

Burnett, T. 1951. Effects of temperature and host density on the rate of increase of an insect parasite. Am. Nat. 85: 337–352.CrossRefGoogle Scholar
Burnett, T. 1954. Influences of natural temperatures and controlled host densities on ovi-position of an insect parasite. Physiol. Zoöl. 27: 239–248.CrossRefGoogle Scholar
Burnett, T. 1958 a. Effect of host distribution on the reproduction of Encarsia formosa Gahan (Hymenoptera: Chalcidoidea). Can. Ent. 90: 179–191.CrossRefGoogle Scholar
Burnett, T. 1958 b. Effect of area of search on reproduction of Encarsia formosa Gahan (Hymenoptera: Chalcidoidea). Can. Ent. 90: 225–229.CrossRefGoogle Scholar
DeBach, p., and Smith, H. S.. 1941. The effect of host density on the rate of reproduction of entomophagous parasites. J. econ. Ent. 34: 741–745.CrossRefGoogle Scholar
Force, D. C., and Messenger, P. S.. 1964. Fecundity, reproductive rates, and innate chpacity for increase of three parasites of Therioaphis maculata (Buckton). Ecology 45: 706–715.CrossRefGoogle Scholar
Hafez, M. 1961. Seasonal fluctuations of population density of the cabbage aphid, Brevicorynae brassicae (L.), in the Netherlands, and the role of its parasite, Aphidius (Diaeretiella) rapae(Curtis). H. Veenman & Zonen N.V., Wageningen. 1961.Google Scholar
Haynes, D. L., and Sisojević, P.. 1966. Predatory behavior of Philodromus rufus Walckenaer (Araneae: Thomisidae). Can. Ent. 98: 113–133.CrossRefGoogle Scholar
Holling, C. S. 1959. Some characteristics of simple types of predation and parasitism. Can. Ent. 91: 385–398.CrossRefGoogle Scholar
Holling, C. S. 1963. An experimental component analysis of population processes. Mem. ent. Soc. Can., No. 32.CrossRefGoogle Scholar
Holling, C. S. 1966. The functional response of invertebrate predators to prey density. Mem. ent. Soc. Can., No. 48.CrossRefGoogle Scholar
Messenger, P. S. 1964 a. Use of life tables in a bioclimatic study of an experimental aphidbraconid wasp host-parasite system. Ecology 45: 119–131.CrossRefGoogle Scholar
Messenger, P. S. 1964 b. The influence of rhythmically fluctuating temperatures on the development and reproduction of the spotted alfalfa aphid, Therioaphis maculata. J. econ. Ent. 57: 71–76.CrossRefGoogle Scholar
Messenger, P. S. 1968. Bioclimatic studies of the aphid parasite, Praon exsoletum (Nees). 2. Effects of temperature on the limits to development and developmental rates. In prep.CrossRefGoogle Scholar
Messenger, P. S., and Force, D. C.. 1963. An experimental host–parasite system: Therioaphis maculata (Buckton) – Praon palitans Muesebeck (Homoptera: Aphididae – Hymenoptera: Braconidae). Ecology 44: 532–540.CrossRefGoogle Scholar
Morris, R. F. 1963. The effect of predator age and prey defense on the functional response of Podisus maculiventris Say to the density of Hyphantria cunea Drury. Can. Ent. 95: 1009–1020.CrossRefGoogle Scholar
Schlinger, E. I., and Hall, J. C.. 1959. A synopsis of the biologies of three imported parasites of the spotted alfalfa aphid. J. econ. Ent. 52: 154–157.CrossRefGoogle Scholar
Schlinger, E. I., and Hall, J. C.. 1960. The biology, behavior, and morphology of Praon palitans Muesebeck, an internal parasite of the spotted alfalfa aphid, Therioaphis maculata (Buckton) (Hymenoptera: Braconidae, Aphidiinae). Ann. ent. Soc. Am. 53: 144–160.CrossRefGoogle Scholar
Sekhar, P. S. 1957. Mating, oviposition, and discrimination of hosts by Aphidius testaceipes (Cresson) and Praon aguti Smith, primary parasites of aphids. Ann. ent. Soc. Am. 50: 370–375.CrossRefGoogle Scholar
Solomon, M. E. 1949. The natural control of animal populations. J. Anim. Ecol. 18: 1–35.CrossRefGoogle Scholar
Spencer, H. 1926. Biology of the parasites and hyperparasites of -aphids. Ann. ent. Soc. Am. 19: 119–157.CrossRefGoogle Scholar
Stary, P. 1964. Biological control of Megoura viciae Bckt. in Czechoslovakia. Cas. csl. Spol. ent. 61: 301–322.Google Scholar
Thompson, W. R. 1924. La théorie mathématique de l'action des parasites entomophages et le facteur du hasard. Annals Fac. Sci. Marseille 2: 69–89.Google Scholar
Thompson, W. R. 1939. Biological control and the theories of the interactions of populations. Parasitology 31: 299–388.CrossRefGoogle Scholar
Ullyett, G. C. 1949 a. Distribution of progeny by Chelonus texanus Cress. (Hymenoptera: Braconidae). Can. Ent. 81: 25–44.CrossRefGoogle Scholar
Ullyett, G. C. 1949 b. Distribution of progeny by Cryptus inornatus Pratt (Hymenoptera: Ichneumonidae). Can. Ent. 81 : 285–299.CrossRefGoogle Scholar
Van den Bosch, R., Schlinger, E. I., Dietrick, E. J., Hall, J. C., and Puttler, B.. 1964. Studies on succession, distribution, and phenology of imported parasites of Therioaphis trifolii (Monell) in southern California. Ecology 45: 602–621.CrossRefGoogle Scholar
Watt, K. E. F. 1959. A mathematical model for the effect of densities of attacked and attacking species on the number attacked. Can. Ent. 91: 129–144.CrossRefGoogle Scholar
Wheeler, E. W. 1923. Some braconids parasitic on aphids and their life-history. (Hym.). Ann. ent. Soc. Am. 16: 1–29.CrossRefGoogle Scholar