Online Resource #1. Study site and field data
Climatic Change manuscript-CLIM-D-16-00498: Prediction of Lake
Water Temperature, Dissolved Oxygen, and Fish Habitat under
Changing Climate.
Authors: Shahram Missaghi; Miki Hondzo; William Herb
Corresponding author: Shahram Missaghi, [email protected]
Study site
Lake Minnetonka (60 km2), located at 4454 N; 9341 W, is a
morphologically complex lake (Wetzel, 2001). The lake has 23 bays,
200 km of shoreline, 24 km2 of littoral area, a maximum depth of 34
m, with a watershed size of 319 km2 (Fig. 1). Lake Minnetonka was
inhabited pre European settlement and has been a regional
destination offering swimming, boating, and fishing. At least 15
fish species are found in Lake Minnetonka dominated with northern
pike (Esox lucius), walleye (Stizostedion vitreum), and bluegill
(Lepomis macrochirus). The walleye population is sustained by
annual stocking at two bays. However, fish population assessment
study results showed different catch average sizes (length) among
different bays of the lake indicating the presence of distinct fish
habitats within the lake (MNDNR, 2007). The computational domain of
the study area included four bays and two stream inflows into the
lake. Each bay has a specific individual water quality
characteristic representing the strong water quality heterogeneity
throughout the whole lake.
Field data
Measured stream and lake water quality data were provided by the
Water Quality Department of Minnehaha Creek Watershed District
organization (Minnetonka, MN). All field lake water quality samples
were collected from the deepest point of the three bays of Halsted
Bay (HB, 10 m), Cooks Bay (CB, 8.5 m), and West Upper Bay (WU, 24
m) within the study area (Fig. 1). Each station was sampled
biweekly and analyzed for T, DO, conductivity, pH profiles, surface
and bottom total phosphorus (TP), soluble reactive phosphorus
(PO4), total nitrogen (TN), and a composite top 2-m sample for
algae biomass as measured by chlorophyll a (Chla). Stream inflow
(m3s-1) data were based on the correlation between daily averaged
available measured outflow and precipitation data (1997-2011; R2=
0.82) where the correlation was then applied to hourly
precipitation data of each scenario to generate outflow data. The
biweekly sampling from Six Mile and Langdon creeks (Fig. 1)
included flow, T, DO, Chla, TP, and PO4. Stream water temperatures
from nearby (
