Indirect effects mediated by compensatory shoot growth on subsequent generations of a willow spittlebug |
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Authors: | A Nozawa T Ohgushi |
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Institution: | (1) Institute of Low Temperature Science, Hokkaido University, Nishi 8, Kita 19, Sapporo 060-0819, Japan Tel. +81-11-706-5499; Fax +81-11-706-714 e-mail: zardn@pop.lowtem.hokudai.ac.jp, JP |
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Abstract: | We investigated whether oviposition by the spittlebug Aphrophora pectoralis on Salix miyabeana and S. sachalinensis in fall 1998 affected shoot growth pattern and further oviposition by subsequent generations of the willow spittlebug in
early September 1999 and 2000. Spittlebug oviposition enhanced the growth of current-year shoots on 1-year shoots with oviposition
(O-shoots) compared to those without oviposition (N-shoots): the length of current-year shoots increased in 1999 and 2000,
the number of current-year shoots increased in 2000 despite a decrease in 1999, and the shoot abscission rate decreased during
the 1999 winter. The number of egg masses per current-year shoot was greater on O-shoots than on N-shoots in 1999, and this
tendency was reinforced in 2000. The total number of egg masses was greater on O-shoots than on N-shoots in 2000, although
there was no significant difference in 1999. There is thus a positive feedback system between spittlebug attack and compensatory
growth on willow.
Received: April 11, 2002 / Accepted: July 30, 2002
Present address: Center for Ecological Research, Kyoto University, Otsu, Japan
Acknowledgments We thank Masanori J. Toda and Andrew Davis for valuable comments and critical reading on this paper. Financial support was
provided by a Japanese Ministry of Education, Science, Sports, and Culture Grant-in-Aid for Creative Basic Research to Takayuki
Ohgushi.
Correspondence to:A. Nozawa |
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Keywords: | Salix miyabeana Salix sachalinensis Aphrophora pectoralis Population dynamics |
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