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Host plant growth characteristics as determinants of abundance and phenology in jumping plant-lice on downy willow

Hodkinson, ID; Bird, JM; Hill, JK; Baxter, R


ID Hodkinson

JM Bird

JK Hill


1. Salix lapponum host plants at an upper altitudinal site differed significantly in size, structural density, phenology, growth performance, and spatial isolation from those growing at a lower site. 2. Plant differences were paralleled by significant differences in psyllid population density and phenology parameters, with psyllid population density, percentage of catkins occupied, and phenological development relatively lower or retarded at the upper site. Population densities at the upper site, nevertheless, remained high. 3. Plant measurements were good predictors of insect density, often explaining up to 73% of the variance in abundance among plants at a given site. 4. Sets of four plant characters identified by best subsets regression were better predictors of psyllid density and development than single factors, although differences were often not great and the combinations of characters selected by multiple regression sometimes differed from the best single predictors. 5. Best single predictors of psyllid density on catkins were measurements of plant size, particularly height, length, and basal stem diameter. Shoot density and catkin phenology were occasionally important but plant isolation and prior growth performance were less important. 6. By contrast with density, age structure of the psyllid population was predicted best from plant phenological measurements, notably catkin phenology.


Hodkinson, I., Bird, J., Hill, J., & Baxter, R. (2001). Host plant growth characteristics as determinants of abundance and phenology in jumping plant-lice on downy willow. Ecological Entomology, 26(4), 376-387.

Journal Article Type Article
Publication Date Aug 1, 2001
Deposit Date May 18, 2007
Journal Ecological Entomology
Print ISSN 0307-6946
Electronic ISSN 1365-2311
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 26
Issue 4
Pages 376-387
Keywords Plant lice, Downy willow, Pphenology.
Publisher URL