Contagious egg-distribution on host pods and avoidance of pods received eggs in a wild bruchidKytorhinus sharpianus
Tóm tắt
The present study investigated the way a wild bruchid,Kytorhinus sharpianus, distributes its eggs on host pods. First, we counted the number of eggs per pod on the host plant (Sophola flavescens) in the field. The egg-distributions by the overwintered-generation adults in July and by the second-generation adults in mid October did not deviate from Poisson distribution because of small numbers of eggs laid. However, the egg-distribution in late August when many first-generation adults emerged was significantly contagious. The deposition of eggs was determined for three types of pods: (A) clean pods, (B) pods with eggs, and (C) those which eggs had been laid on but were removed from later. The numbers of eggs laid newly on three types of pods were significantly different; A>C>B, suggesting that an oviposition marker pheromone (O.M.P.) caused females to avoid pods on which eggs were deposited. Egg-shells reinforced that response. Monte Carlo simulations for the egg-distribution on pods predicted that even if females avoid pods with heavy egg-load through O.M.P., the egg-distribution becomes contagious when there is a large heterogeneity in quality of the pods.
Tài liệu tham khảo
Andrewartha, H. G. and L. C. Birch (1954)The distribution and abundance of animal populations Univ. Chicago Press, Chicago. 782 pp.
Bellows, T. S. Jr. (1981) The descriptive properties of some models for density dependence.J. Anim. Ecol. 50: 139–156.
Fretwell, S. D. and H. L. Lucas (1970) On territorial behaviour and other factors influencing habitat distribution in birds. I. Theoretical development.Acta biother. 19: 16–36.
May, R. M. (1975) Biological populations obeying difference equations: stable points, stable cycles and chaos.J. theor. Biol. 49: 511–524.
Messina, F. J. and J. A. A. Renwick (1985) Ability of ovipositing seed beetles to discriminate between seeds with different egg-loads.Ecol. Entomol. 10: 225–230.
Mitchell, R.D. (1975) The evolution of oviposition tactics in the bean weevil,Callosobruchus maculatus (F.).Ecology 56: 696–702.
Morisita, M. (1950) Dispersal and population density of a water stridor,Gerris lacstris L.Physiol. Ecol. Kyoto Univ. 65: 1–149. (In Japanese with English summary)
Ohshima, K., H. Honda and I. Yamamoto (1973) Isolation of an oviposition marker from azuki bean weevil,Callosobruchus chinensis (L.).Agr. Biol. Chem. 37: 2679–2680.
Ofuya, T. and S. Agele (1989) Ability of ovipositingCallosobruchus maculatus females to discriminate between seeds bearing their own eggs and those bearing eggs of other females.Ecol. Entomol. 14: 243–246.
Shimada, M. (1988) Dry bean infestation and oviposition without feeding by a wild multivoltine bean weevil,Kytorhinus sharpianus Bridwell (Coleoptera: Bruchidae).Appl. Ent. Zool. 23: 459–467.
Shimada, M. (1989) Systems analysis of density-dependent population processes in the azuki bean weevil,Callosobruchus chinensis.Ecol. Res. 4: 145–156.
Shimada, M. (1990a) Preadaptation of a wild bean weevil,Kytorhinus sharpianus Bridwell (Coleoptera: Bruchidae), for infesting the storage green gram,Vigna radiata (L.) Wilczek (Leguminosae).Appl. Ent. Zool. 25: 132–134.
Shimada, M. (1990b) Comparison of the density-dependent population process between laboratory and wild strains ofCallosobruchus chinensis (L.). 361–371. In K. Fujii, A. M. R. Gatehouse, C. D. Johnson, R. Mitchell, and T. Yoshida (eds)Bruchids and Legumes: Economics, Ecology and Coevolution. Kluwer Acad. Pub., Dordrecht.
Shimada, M. and M. Ishihara (1991) Two stages of overwintering larvae in a wild multivoltine bruchidKytorhinus sharpianus Bridwell (Coleoptera: Bruchidae).Appl. Ent. Zool. (in press)
Smith, R. H. and C. M. Lessells (1985) Oviposition, ovicide and larval competition in granivorous insects. 423–448. In R. M. Sibly and R. H. Smith (eds)Behavioural Ecology: Ecological Consequences of Adaptive Behaviour., Blackwell, Oxford.
Sokal, R. R. and F. J. Rohlf (1981)Biometry, 2nd ed. W. H. Freeman, San Francisco. 857 pp.
Umeya, K. (1966) Studies on the comparative ecology of bean weevils. I. On the egg distribution and the oviposition behaviours of three species of bean weevils infesting azuki beans.Res. Bull. Plant Prot., Japan 3: 1–11
Utida, S. (1943) Studies on experimental population of azuki bean weevil,Callosobruchus chinensis (L.). VIII. Statistical analysis of frequency distribution of the emerging weevils on beans.Mem. Coll. Agr., Kyoto Imp. Univ. 54: 1–22.
Utida, S. (1967) Collective oviposition and larval aggregation inZabrotes subfasciatus (Boh.) (Coleoptera: Bruchidae).J. stored Prod. Res. 2: 315–322.
Utida, S. (1975)Animal Population Ecology. Kyoritsu Shuppan, Tokyo. (In Japanese)
Watanabe, N. (1988) A new proposal for measurement of the adjusted mean crowding through consideration of size variability in habitat unit.Res. Popul. Ecol. 30: 215–216.