DOI: 10.5194/hess-22-6383-2018
论文题名: Hydrogeochemical controls on brook trout spawning habitats in a coastal stream
作者: Briggs M.A. ; Harvey J.W. ; Hurley S.T. ; Rosenberry D.O. ; McCobb T. ; Werkema D. ; Lane J.W. ; Jr.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 12 起始页码: 6383
结束页码: 6398
语种: 英语
Scopus关键词: Aquifers
; Deposits
; Discharge (fluid mechanics)
; Dissolution
; Dissolved oxygen
; Ecosystems
; Glacial geology
; Groundwater flow
; Groundwater resources
; Hydrochemistry
; Landforms
; Pipeline bends
; Rivers
; Seepage
; Dissolved oxygen concentrations
; Ground water discharge
; Groundwater fluxes
; Groundwater seepage
; Massachusetts , USA
; Pore-water chemistry
; Regional groundwater
; Solute concentrations
; Groundwater geochemistry
; aquifer
; dissolved oxygen
; egg development
; groundwater flow
; groundwater-surface water interaction
; habitat type
; hydrogeochemistry
; meander
; outwash
; overwintering
; river basin
; river discharge
; salmonid
; seepage
; spawning ground
; stream
; suboxic conditions
; Cape Cod
; Massachusetts
; United States
; Salmonidae
; Salvelinus fontinalis
英文摘要: Brook trout (Salvelinus fontinalis) spawn in fall and overwintering egg development can benefit from stable, relatively warm temperatures in groundwater-seepage zones. However, eggs are also sensitive to dissolved oxygen concentration, which may be reduced in discharging groundwater (i.e., seepage). We investigated a 2km reach of the coastal Quashnet River in Cape Cod, Massachusetts, USA, to relate preferred fish spawning habitats to geology, geomorphology, and discharging groundwater geochemistry. Thermal reconnaissance methods were used to locate zones of rapid groundwater discharge, which were predominantly found along the central channel of a wider stream valley section. Pore-water chemistry and temporal vertical groundwater flux were measured at a subset of these zones during field campaigns over several seasons. Seepage zones in open-valley sub-reaches generally showed suboxic conditions and higher dissolved solutes compared to the underlying glacial outwash aquifer. These discharge zones were cross-referenced with preferred brook trout redds and evaluated during 10 years of observation, all of which were associated with discrete alcove features in steep cutbanks, where stream meander bends intersect the glacial valley walls. Seepage in these repeat spawning zones was generally stronger and more variable than in open-valley sites, with higher dissolved oxygen and reduced solute concentrations. The combined evidence indicates that regional groundwater discharge along the broader valley bottom is predominantly suboxic due to the influence of near-stream organic deposits; trout show no obvious preference for these zones when spawning. However, the meander bends that cut into sandy deposits near the valley walls generate strong oxic seepage zones that are utilized routinely for redd construction and the overwintering of trout eggs. Stable water isotopic data support the conclusion that repeat spawning zones are located directly on preferential discharges of more localized groundwater. In similar coastal systems with extensive valley peat deposits, the specific use of groundwater-discharge points by brook trout may be limited to morphologies such as cutbanks, where groundwater flow paths do not encounter substantial buried organic material and remain oxygen-rich. © Author(s) 2018. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163110
Appears in Collections: 气候变化与战略
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作者单位: Briggs, M.A., U.S. Geological Survey, Hydrogeophysics Branch, 11 Sherman Place, Storrs, CT 06269, United States; Harvey, J.W., U.S. Geological Survey, Water Cycle Branch, M.S. 430, Reston, VA 20192, United States; Hurley, S.T., Massachusetts Division of Fisheries and Wildlife, 195 Bournedale Road, Buzzards Bay, MA 02532, United States; Rosenberry, D.O., U.S. Geological Survey, National Research Program, M.S. 406, Lakewood, CO 80225, United States; McCobb, T., U.S. Geological Survey, 10 Bearfoot Road, Northborough, MA 01532, United States; Werkema, D., U.S. Environmental Protection Agency, Exposure Methods and Measurement Division, Environmental Chemistry Branch, Las Vegas, NV 89119, United States; Lane, J.W., Jr., U.S. Geological Survey, Hydrogeophysics Branch, 11 Sherman Place, Storrs, CT 06269, United States
Recommended Citation:
Briggs M.A.,Harvey J.W.,Hurley S.T.,et al. Hydrogeochemical controls on brook trout spawning habitats in a coastal stream[J]. Hydrology and Earth System Sciences,2018-01-01,22(12)