Littoral water temperature response to experimental shoreline logging around small boreal forest lakes

2001 ◽  
Vol 58 (8) ◽  
pp. 1638-1647 ◽  
Author(s):  
Robert J Steedman ◽  
Robert S Kushneriuk ◽  
Robert L France
Keyword(s):  
Boreal Forest ◽  
Water Temperature ◽  
Diurnal Temperature Range ◽  
Temperature Response ◽  
Early Summer ◽  
Buffer Strips ◽  
Monitoring Period ◽  
Diurnal Temperature ◽  
Northwestern Ontario ◽  
Forest Lakes

Shoreline logging did not significantly increase average littoral water temperatures in two small boreal forest lakes in northwestern Ontario, Canada. However, over the early summer monitoring period clearcut shorelines were associated with increases of 1–2°C in maximum littoral water temperature, and increases of 0.3–0.6°C in average diurnal temperature range, compared with undisturbed shorelines or shorelines with 30-m shoreline buffer strips. Comparison of simultaneous water temperatures at littoral locations with and without shoreline forest showed that increased temperatures were caused by daytime heating.

Changes in phytoplankton communities following logging in the drainage basins of three boreal forest lakes in northwestern Ontario (Canada), 1991–2000

2003 ◽  
Vol 60 (1) ◽  
pp. 43-54 ◽  
Author(s):  
K H Nicholls ◽  
R J Steedman ◽  
E C Carney
Keyword(s):  
Boreal Forest ◽  
Drainage Basin ◽  
Forest Harvesting ◽  
Intermediate Disturbance Hypothesis ◽  
Drainage Basins ◽  
Mixing Depth ◽  
Buffer Strip ◽  
Northwestern Ontario ◽  
Phytoplankton Communities ◽  
Forest Lakes

The phytoplankton communities of three small boreal forest lakes (L26, L39, and L42) on Ontario's Precambrian Shield (Canada) were investigated over 10 years for possible effects of forest harvesting (logging) within their drainage basins (5 years before logging vs. 5 years after logging). During the postlogging period, higher biovolumes of several taxa were recorded, consistent with previously reported changes in nutrients, chlorophyll, light penetration, and mixing depth. Among the most dramatic changes were increases of 100 and 266% in Cyanophyceae in L39 and L42, respectively, 167% in Dinophyceae in L26, 51 and 130% in Chlorophyceae in L26 and L42, respectively, 182% in Bacillariophyceae in L26, and 53 and 73% in total phytoplankton in L26 and L42, respectively. Other effects associated with logging in the watersheds of these lakes included an increase in the numbers of taxa (in accordance with the intermediate disturbance hypothesis) and a decrease in interannual variability in phytoplankton community structure (in accordance with the ecosystem diversity–stability hypothesis). The less extensive logging of the L26 drainage basin and the maintenance of an unlogged shoreline buffer strip did not preclude apparent effects on phytoplankton comparable with some of those found in the other two lakes, where drainage basin logging was more extensive.

Initial effects of catchment deforestation around small boreal forest lakes in northwestern Ontario, Canada

2000 ◽  
Vol 27 (2) ◽  
pp. 1101-1107
Author(s):  
Robert J. Steedman ◽  
Robert S. Kushneriuk ◽  
Robert L. France
Keyword(s):  
Boreal Forest ◽  
Northwestern Ontario ◽  
Forest Lakes

scholarly journals Bed conduction impact on fiber optic distributed temperature sensing water temperature measurements

2015 ◽  
Vol 4 (1) ◽  
pp. 19-22 ◽  
Author(s):  
T. O'Donnell Meininger ◽  
J. S. Selker
Keyword(s):  
Water Temperature ◽  
Diurnal Temperature Range ◽  
Fiber Optic ◽  
Stream Temperature ◽  
Temperature Sensing ◽  
Temperature Measurements ◽  
Distributed Temperature Sensing ◽  
Diurnal Temperature ◽  
Sediment Bed ◽  
Bed Materials

Abstract. Error in distributed temperature sensing (DTS) water temperature measurements may be introduced by contact of the fiber optic cable sensor with bed materials (e.g., seafloor, lakebed, streambed). Heat conduction from the bed materials can affect cable temperature and the resulting DTS measurements. In the Middle Fork John Day River, apparent water temperature measurements were influenced by cable sensor contact with aquatic vegetation and fine sediment bed materials. Affected cable segments measured a diurnal temperature range reduced by 10% and lagged by 20–40 min relative to that of ambient stream temperature. The diurnal temperature range deeper within the vegetation–sediment bed material was reduced 70% and lagged 240 min relative to ambient stream temperature. These site-specific results illustrate the potential magnitude of bed-conduction impacts with buried DTS measurements. Researchers who deploy DTS for water temperature monitoring should understand the importance of the environment into which the cable is placed on the range and phase of temperature measurements.

scholarly journals Technical Note: Bed conduction impact on fiber optic DTS water temperature measurements

2014 ◽  
Vol 4 (2) ◽  
pp. 375-384
Author(s):  
T. O'Donnell Meininger ◽  
J. S. Selker
Keyword(s):  
Water Temperature ◽  
Diurnal Temperature Range ◽  
Aquatic Vegetation ◽  
Fiber Optic ◽  
Stream Temperature ◽  
Temperature Measurements ◽  
Diurnal Temperature ◽  
Temperature Range ◽  
Sediment Bed ◽  
Bed Materials

Abstract. Error in Distributed Temperature Sensor (DTS) water temperature measurements may be introduced by contact of the fiber optic cable sensor with bed materials (e.g., seafloor, lakebed, stream bed). Heat conduction from the bed materials can affect cable temperature and the resulting DTS measurements. In the Middle Fork John Day River, apparent water temperature measurements were influenced by cable sensor contact with aquatic vegetation and fine sediment bed materials. Affected cable segments measured a diurnal temperature range reduced by 10% and lagged by 20–40 min relative to that of ambient stream temperature. The diurnal temperature range deeper within the vegetation–sediment bed material was reduced 70% and lagged 240 min relative to ambient stream temperature. These site-specific results illustrate the potential magnitude of bed-conduction impacts with buried DTS measurements. Researchers who deploy DTS for water temperature monitoring should understand the importance of the environment into which the cable is placed on the range and phase of temperature measurements.

scholarly journals Extreme Meteorological Events in a Coastal Lagoon Ecosystem: The Ria de Aveiro Lagoon (Portugal) Case Study

2021 ◽  
Vol 9 (7) ◽  
pp. 727
Author(s):  
José Fortes Lopes ◽  
Carina Lurdes Lopes ◽  
João Miguel Dias
Keyword(s):  
Water Temperature ◽  
Coastal Lagoon ◽  
Early Summer ◽  
Extreme Weather Events ◽  
Climate Change Scenarios ◽  
State Variables ◽  
Ria De Aveiro ◽  
Physical Conditions ◽  
Weather Events ◽  
The Impact

Extreme weather events (EWEs) represent meteorological hazards for coastal lagoon hydrodynamics, of which intensity and frequency are increasing over the last decades as a consequence of climate changes. The imbalances they generated should affect primarily vulnerable low-lying areas while potentially disturbing the physical balances (salt and water temperature) and, therefore, the ecosystem equilibrium. This study arises from the need to assess the impact of EWEs on the Ria de Aveiro, a lagoon situated in the Portuguese coastal area. Furthermore, it was considered that those events occur under the frame of a future sea-level rise, as predicted by several climate change scenarios. Two EWEs scenarios, a dry and an extremely wet early summer reflecting past situations and likely to occur in the future, were considered to assess the departure from the system baseline functioning. It was used as a biogeochemistry model that simulates the hydrodynamics, as well as the baseline physical and biogeochemistry state variables. The dry summer scenario, corresponding to a significant reduction in the river’s inflow, evidences a shift of the system to a situation under oceanic dominance characterized by colder and saltier water (~18 °C; 34 PSU) than the baseline while lowering the concentration of the nutrients and reducing the phytoplankton population to a low-level limit. Under a wet summer scenario, the lagoon shifted to a brackish and warmer situation (~21 °C, <15 PSU) in a time scale of some tidal periods, driven by the combining effect of the tidal transport and the river’s inflow. Phytoplankton patterns respond to variability on local and short-term scales that reflect physical conditions within the lagoon, inducing nutrient-supported growth. Overall, the results indicate that EWEs generate local and transient changes in physical conditions (namely salinity and water temperature) in response to the characteristic variability of the lagoon’s hydrodynamics associated with a tidal-dominated system. Therefore, in addition to the potential impact of changing physical conditions on the ecosystem, saline intrusion along the lagoon or the transfer of brackish water to the mouth of the system are the main consequences of EWEs, while the main biogeochemistry changes tend to remain moderate.

Sign in / Sign up

Export Citation Format

Share Document