Relationship between water quality, watermilfoil frequency, and weevil distribution in the State of Washington
During the summer of 1997, we surveyed 50 waterbodiesin Washington State to determine the distribution of theaquatic weevilEuhrychiopsis leconteiDietz. We collected dataon water quality and the frequency of occurrence of watermilfoilspecies within selected watermilfoil beds to comparethe waterbodies and determine if they were related to thedistribution E. lecontei. We foundE. leconteiin 14 waterbodies,most of which were in eastern Washington. Only one lakewith weevils was located in western Washington. Weevils wereassociated with both Eurasian (Myriophyllum spicatumL.) andnorthern watermilfoil (M. sibiricumK.). Waterbodies withE.leconteihad significantly higher (P< 0.05) pH (8.7±0.2)(mean±2SE), specific conductance (0.3±0.08 mS cm-1) andtotal alkalinity (132.4±30.8 mg CaCO3L-1). We also foundthat weevil presence was related to surface water temperatureand waterbody location ( = 24.3,P≤0.001) and of allthe models tested, this model provided the best fit (Hosmer-Lemeshow goodness-of-fit = 4.0,P= 0.9). Our results suggestthat in Washington StateE. leconteioccurs primarily ineastern Washington in waterbodies with pH≥8.2 and specificconductance≥0.2 mS cm-1. Furthermore, weevil distributionappears to be correlated with waterbody location (easternversus western Washington) and surface water temperature.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | English |
| Published: |
2000
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| Subjects: | Management, Biology, Limnology, Euhrychiopsis lecontei, Myriophyllum spicatum, Myriophyllum sibiricum, weevil presence, temperature, pH, Washington, USA, Eurasian watermilfoil, |
| Online Access: | http://hdl.handle.net/1834/19784 |
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