Susceptibility of riparian soil invertebrates to the herbicide triclopyr Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1j92gb28h

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  • Riparian zones of Pacific Northwest forests have high species diversity and abundance and act as an important interface between the aquatic and terrestrial ecosystems. In addition, riparian zones comprise a significant portion of the total buffer zone established during commercial forest production to protect aquatic ecosystems from adjacent management activities. Riparian soil invertebrates indigenous to Pacific Northwest forest ecosystems were chosen to investigate impacts from herbicide use. Species chosen for toxicity testing inhabit riparian zones of western Oregon Forests and were collected from the field. The species tested included; two ground beetles, Coleoptera; Carabidae, (Pterostichu inanis) Horn, and, (Scaphinotus marginalus) Fisher; an isopod (Ligidium sp); and a millipede (Harpaphe haydeniana haydeniana) Wood, Polydesmida; Xestodesmidaie. The formulated product of a herbicide widely used in western Oregon forests, Garlon 4, and a specialty formulation of Garlon 4, (XRM-4714 Blank) without the active ingredient triclopyr, were applied via a cabinet sprayer to a soil surface in accordance with a standard soil test method. At the recommended field rate of 4.48kg/ha, the isopod displayed significant mortality after 7-Day exposure, however the other four species were unaffected. The order of susceptibility based on 14-Day LC₅₀ estimates, (kg/ha), for these four species was, P. inanis (38.6)>S. marginalis (34.2)>H. haydeniana (5.1)>Ligidum sp (4.7). The isopod and millipede species exposed to the Garton 4 blank formulation for fourteen days resulted LC₅₀ estimates twice and nine-times higher than from the formulated product, respectively. The potential for this data in estimating the Hazardous Concentration to 5% of the species in the riparian forest community is also discussed.
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