Arboreal spiders (Araneae) on balsam fir and spruces in east-central Maine

Spiders of 11 families, 22 genera, and at least 33 species were collected from crown foliage samples of Abies balsamea (L.) Mill., Picea rubens Sarg., and Picea glauca (Moench) Voss in east-central Maine. For both study years (1985, 1986), spider species composition varied by foraging strategy (web...

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Bibliographic Details
Published in:The Journal of arachnology 1988-01, Vol.16 (2), p.223-235
Main Authors: Jennings, Daniel T., Dimond, John B.
Format: Article
Language:English
Subjects:
abies balsamea
araignee
aranas
biological control
Branches
choristoneura
Coniferous forests
control biologico
densidad de la poblacion
densite de population
enemigos naturales
ennemi naturel
Forest stands
Hunting
Insect larvae
Leaves
lutte biologique
maine
natural enemies
picea glauca
picea rubens
population density
Population estimates
Predators
Spiders
taxonomia
taxonomie
taxonomy
Trees
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Summary:Spiders of 11 families, 22 genera, and at least 33 species were collected from crown foliage samples of Abies balsamea (L.) Mill., Picea rubens Sarg., and Picea glauca (Moench) Voss in east-central Maine. For both study years (1985, 1986), spider species composition varied by foraging strategy (web spinner, hunter) and among 10 study sites. Numbers, life stages, and sex ratios of spiders also differed between study years. Spider densities per m2of foliage area generally were greater (P ≦ 0.05) on spruces (X̄ = 16.3 ± 1.1) than on fir (X̄ = 10.9 ± 1.0). Estimates of absolute populations of arboreal spiders ranged from 35,139 to 323,080/ha; of spruce budworm from 271,401 to 6,122,919/ha. Spider-budworm densities/ha covaried significantly (P ≦ 0.001) each year (r = 0.84, 1985; r = 0.71, 1986). None of the measured forest-stand parameters (basal area, tree species percentage) were reliable predictors of spider populations/ha.
ISSN:0161-8202
1937-2396