The Spatial Pattern of Aphis gossypii οn Cotton

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Published: Jan 7, 1998
DOI: https://doi.org/10.12681/eh.14016
Keywords:
Aphis gossypii Spatial distribution Cotton
E. T. Kapatos
National Agricultural Research Foundation, Plant Protection Institute, P.O. Box 303, 380 01 Volos, Greece
E.T. Stratopoulou
National Agricultural Research Foundation, Plant Protection Institute, P.O. Box 303, 380 01 Volos, Greece
J.A. Tsitsipis
University ofThessalia Pedi on Areos, GR 383 34, Volos, Greece
D.P. Lycouresis
Agricultural University of Athens, leraodos 75, 118 55 Athens, Greece
M.P. Alexandri
University ofThessalia Pedi on Areos, GR 383 34, Volos, Greece
Abstract
The spatial distribution of Aphis gossypii (Glover) on cotton was studied by using Taylor’s power law, the negative binomial parameter k and the iδ-index of aggregation. Both k and iδ were related to density with curvilinear relationships and indicated that aggregation decreases as density increases up to densities of, approximately, two individuals per leaf. At the very high densities (more than three individuals per leaf) the calculated values of the two indices recognized a tendency for an increased aggregation again. A strong linear relationship between the log mean and the log variance of the population density was obtained confirming the wide applicability of Taylor’s power law. However, the established relationship (b=1.433) assumes, for the range of the observed densities, a continuous decrease in the degree of aggregation as density increases. It is suggested that the changes in the degree of aggregation throughout the season and in relation to density are related to natural mortality.
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References
Asante, S.Κ., W. Danthanarayana and S.C. Cairns. 1993. Spatial and temporal distribution patterns of Eriosoma lanigerum (Homoptera: Aphididae) on apple. Environ. Entomol. 22: 1060-1065.
Dean. G.J.W. 1973. Distribution of aphids in spring cereals. J. appi. Ecol. 10(2): 447-462.
Elliot. J.M. 1977. Some methods for the statistical analysis of samples of benthic invertebrates, 2nd ed. Freshwater Biological Association, Wilson. Cumbria & Dorset.
Kapatos E.T., E.T. Stratopoulou, A. Sahinoglou, J.A. Tsitsipis and D.P. Lycouresis. 1996. Development of an optimum sampling plan for the population of Aphis gossypii (Horn., Aphididae) on cotton in Greece. J. Appi. Ent. 120: 245-248.
Morisita. M. 1962. U-index. a measure of dispersion of individuals. Res. Popul. Ecol. 4: 1-7.
Pennacchio, F. and E. Tremblay. 1986, Distribuzione spaziale e piani di campionamento di due specie afidiche dell'erba medica. Acyrthosiphon pisum (Harris) e Therioaphis trifola f. maculata (Monell) (Homoptera. Aphidoidea) Frustrila Entomologica, N.S. IX: 9-21.
Robert, Y., C.A. Dedryver and J.S. Pierre. 1988. Sampling techniques in: "Aphids. their biology, natural enemies and control", Eds. A.K. Minks and P. Harrewijn. Elsevier. Amsterdam. Vol. 2B: 1-20.
Southwood. T.R.E. 1978. Ecological methods with particular reference to the study of insect populations. 2nd ed. Chapman & Hall. London.
Taylor, L.R. 1961. Aggregation, variance and the mean. Nature 189:732-735.
Taylor. L.R. 1970. Aggregation and the transformation of counts of Aphids fabae Scop, on beans. Ann. Appi. Biol. 65: 181-189.
Taylor. L.R. 1984. Assessing and interpreting the spatial distributions of insect populations. Annu. Rev. Entomol. 29:321-357.
Taylor. L.R.. LP. Woiwod and J.N. Perry. 1979. The negative binomial as a dynamic ecological model for aggregation, and the density dependence of k. J. Anim. Ecol. 48: 289-304.
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