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Report: A Hydroecological Assessment of Hydraulic Connectivity: Phase 3 Field Investigation at Otter Park, Langley
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An investigation of how hydrological variability influences instream habitat and stream organisms in Bertrand Creek at Otter Park in Langley Township, British Columbia.
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Author: Adam J. Mitton, Diana M. Allen, and Alexandre H. Nott
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Date Published: Sep 2024
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Report ID: 63120
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Audience: Government and Public
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An investigation of the influence of hydrological variability on instream habitat and stream organisms was conducted in Bertrand Creek at Otter Park in Langley Township, British Columbia. This project is an extension of a multi-year study focused on aquifer-stream exchange. The hydrological monitoring network installed at Otter Park in 2018 was used to characterize hydrological variability. The network included groundwater monitoring wells, a pumping well, instream piezometers, and hydrometric stations. Habitat and macroinvertebrate sampling began in 2020 to characterize how habitat conditions and benthic communities varied with hydrological variables as conditions became drier over the summer. Macroinvertebrates samples were collected each month from June through September using a Surber net at eight sites spaced throughout the reach between riffle habitat and pool habitat. Benthic samples were followed by measurement of water quality variables (DO, pH, EC) and hydraulic habitat variables (velocity, depth, substrate) at each location. Hydrometric data revealed that stream drying observed in 2018 was consistent with dominant hydrological patterns at Otter Park. Stream drying is proceeded by flow cessation, which occurred each year. Macroinvertebrate and habitat sampling data revealed important ecological consequences of the recurrence of flow cessation and drying. Extremely low richness and diversity of the benthic macroinvertebrate community assemblages in riffle habitat and pool habitat is likely due the loss of many taxa in response to adverse changes in habitat conditions associated with flow cessation and drying. Modelling of relationships between benthic macroinvertebrate abundance and habitat variables suggested that DO and velocity were the significant drivers of spatial and temporal variability in benthic macroinvertebrate abundance. Both DO and velocity conditions were generally better in riffle habitat than pool habitat. The maintenance of habitat at zero discharge is one of the unique characteristics of hydrological and habitat variability in non-perennial systems that challenges and likely precludes the routine application of many common environmental flow assessment methodologies in these systems.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Invertebrates - Aquatic |
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Region - Lower Mainland |
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Fish and Fish Habitat - Habitat and Stream Assessment |
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Water Information - Groundwater |
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Water Information - Hydrometric / Hydrology |
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Water Information - Water Management |
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