A 4-year study of invasive and native spider populations in Maine

Canadian Journal of Zoology
By: , and 



Invasive spiders pose potential threats to native spiders. In 2002, the European spider Linyphia triangularis (Clerck, 1757) (Araneae: Linyphiidae) was discovered in all but one county in Maine. At Acadia National Park, we conducted a 4-year study of L. triangularis and three native linyphiid species of a similar size (Frontinella communis (Hentz, 1850), Pityohyphantes subarcticus Chamberlin and Ivie, 1943, and Neriene radiata (Walckenaer, 1842)). Using line-transect surveys, we measured population densities in coastal and forest habitat. The density of L. triangularis varied across years but was always significantly higher on the coast than in the forest. In contrast, only one native species was present on the coast and at very low numbers. Coastal L. triangularis were larger and in better condition than those in the forest, and numbers and biomass of insect prey were also higher on the coast. In 2 years, we also conducted transects at a second coastal location in Maine where the invader was at low density. At that site, native densities were substantially higher than at either Acadia site. Our data are consistent with the hypothesis that L. triangularis is reducing populations of native spiders. Companion studies suggest that L. triangularis negatively impacts natives by usurping both web sites and webs.

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Publication type Article
Publication Subtype Journal Article
Title A 4-year study of invasive and native spider populations in Maine
Series title Canadian Journal of Zoology
DOI 10.1139/z11-050
Volume 89
Issue 8
Year Published 2011
Language English
Publisher NRC Research Press
Publisher location Ottawa, ON
Contributing office(s) Patuxent Wildlife Research Center
Description 10 p.
First page 668
Last page 677
Country United States
State Maine
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