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Article
Author
Journal
Largemouth bass
David R.
Lake and
consumption
Christensen;
Reservoir
demand on
Barry C.
Management
hatchery rainbow
Moore
ISSN
ISSN
(Electronic)
(Paper)
1040-2381
0743-
CONTROL
Volume
Issue
Date
Pages
26
3
2010
200 -
Largemouth bass
High mortality (84-
211
consumption
89%) of stocked
demand on
rainbow trout
hatchery rainbow
(Oncorhynchus
trout in two
trout in two
mykiss) in Twin
Washington lakes
Washington lakes
Lakes, Washington,
8141
(Author)
Abstract
has been partially blamed on predation from nonnative largemouth bass (Micropterus salmoides). We examined the gutcontent of 434 largemouth bass and applied a bioenergetics model to determine the consumption demand on hatchery-released rainbow trout and other prey species in the Twin Lakes. Largemouth bass consumed approximately 4915 (95% CI; 239313,452) fall stocked rainbow trout in South Twin. No rainbow trout consumption was observed in North Twin, despite a similar stocking regime. Approximately 6.3% (95% CI; 317%) of total fall stocked rainbow trout in South Twin were consumed by largemouth bass. Rainbow trout stocked in the fall ranged from 100 to 160 mm total length and were all subject to predation by large largemouth bass ≥300 mm. Large largemouth bass consumed rainbow trout that reached up to 210 mm in length and 58% of bass body length. No predation was observed on larger rainbow trout (215370 mm) stocked during the spring. Smaller largemouth bass ≤299 mm consumed primarily invertebrates, including crayfish, and did not consume rainbow trout in either lake. During spring and summer in South Twin Lake, large largemouth bass consumed principally golden shiner (Notemigonus crysoleucas) and crayfish. In North Twin Lake, golden shiner constituted most of the larger bass diet for the entire year. Differences in macrophyte distribution, bathymetry, temperature and/or predator-prey demographics likely influenced variability in largemouth bass predation between lakes. Largemouth bass predation did not account for overall rainbow trout mortality. Public preferences
Damian C.
Lake and
and values for
Adams;
Reservoir
management of
Santiago
Management
aquatic invasive
1040-2381
0743-
26
3
2010
185 -
Public preferences
Alien invasive
193
and values for
plants (AIP)
management of
significantly impact
Bucaram;
aquatic invasive
the ecology of
plants in state
Donna J. Lee;
plants in state parks
natural areas and
parks
Alan W.
nature-based
Hodges
recreation, yet
8141
control programs are chronically underfunded. This study examined Florida residents' willingness-to-pay (WTP) to control aquatic AIP in river and lake state parks through entrance fees. We used a method commonly applied in the nonmarket valuation literature, but not previously applied to AIP, and found that residents have a high WTP to control AIP and are willing to support control programs through entrance fees. In 2007, we surveyed 1299 Florida residents to estimate the impact of AIP on state park recreation. The survey included conjoint choice questions to establish the impact of several park attributes on respondents' economic utility or welfare: abundance of AIP, entrance fees, park facilities, abundance of native plant species, and abundance of native animal species. Using entrance fees as a payment vehicle, we estimated that the typical Florida resident has a pervisit WTP of $6.15 to reduce AIP coverage, $4.41 to improve park facilities, $3.81 to increase the abundance of native plants, and $4.99 to increase the abundance for native animals. We used annual attendance data from 63 river and lake state parks to calculate statewide WTP to control AIP and found that local residents are willing to spend $12.26 million/yr, and all users are willing to spend $35.01 million/yr to keep AIP from becoming “numerous and dense†in the 63 parks. This far outweighs the $26 million/yr that the state is currently spending in all natural areas, including state parks. Spatial and
Margaret A.
Lake and
temporal patterns
Shanafield;
Reservoir
of nearshore
Richard B.
Management
clarity in Lake
1040-2381
0743-
26
3
2010
178 -
Spatial and
The nearshore areas
184
temporal patterns of
of lakes respond
nearshore clarity in
quickly to
Susfalk;
Lake Tahoe from
watershed runoff,
Tahoe from fine
Kendrick C.
fine resolution
increases in
resolution turbidity
Taylor
turbidity
tributary inflows
measurements
from annual
8141
measurements
snowmelt, and increased anthropogenic activity in the basin. Therefore, this area of the lake serves both as an early warning system for water quality degradation and as an indicator of the effectiveness of land management practices or sediment control projects. In this study we evaluated the usefulness of combining finescale water quality measurements and discrete particle sample analysis to gain a better understanding of seasonal and spatial trends in the nearshore area of Lake Tahoe. Turbidity and mineral composition at 0.5 m depth were measured in nearshore waters near the City of South Lake Tahoe at a spatial resolution of 5-30 m in 2002 and 2003. Particles filtered from discrete samples collected 200 m from shore were analyzed by scanning electron microscopy and chemical analysis using quantum electron dispersive spectrometry. Baseline turbidity levels were extremely low (0.15 NTU) during calm periods in the fall but rose to levels above 4.0 NTU in response to winter and spring precipitation events and spring snowmelt runoff. Discrete samples collected 200 m from shore contained over 80% organic material during the dry part of the year and at least 50% mineral particles during the winter and spring. The effectiveness of this method for detecting variability in nearshore conditions at Lake Tahoe is promising for monitoring the littoral areas of other pristine lakes facing increased anthropogenic pressure and other watershed disturbances. Using GIS to
Jeffrey
Lake and
estimate lake
Hollister; W.
Reservoir
volume from
Bryan
Management
limited data
Milstead
1040-2381
0743-
26
3
2010
8141
194 -
Using GIS to
Estimates of lake
199
estimate lake
volume are
volume from
necessary for
limited data
calculating residence time and modeling pollutants. Modern GIS methods for calculating lake volume improve on more dated technologies (e.g., planimeters) and do not require potentially inaccurate assumptions (e.g., volume of a frustum of a cone), but most GIS methods do require detailed bathymetric data, which may be unavailable. GIS technology cannot correct for a lack of data; however, it can facilitate development of methods that better use the relatively simple and more widely available measurements of lake shape and maximum depth. In this research note we describe a method to model bathymetry and estimate lake volume with a limited set of data that consists only of a maximum depth measurement and a GIS layer of lake shoreline. Using a simple linear transformation, we estimated depth as a function of distance from shoreline and with the resultant information estimated lake volume. We applied and compared this method with estimates derived from field bathymetry data of 129 lakes in New Hampshire. In New Hampshire lakes, the assumption of depth as a function of distance is appropriate, and the simple GIS method has lower overall error than simply using the formula for volume of a cone to estimate lake volume. This approach has broad implications in the assessment of lake condition from national surveys (e.g., US Environmental Protection Agency's National Lakes Assessment) and should improve upon models of nutrients, contaminants and hydrology, even in the absence of detailed bathymetric data. Supplemental materials are available for this article. Go to the publisher's online edition of Lake and Reservoir Management to view the free supplemental file.
Manganese
Carmen
Lake and
sources and
Betancourt;
Reservoir
cycling in a
Fanny Jorge;
Management
tropical eutrophic
1040-2381
0743-
26
3
2010
217 -
Manganese sources
Paso Bonito
226
and cycling in a
Reservoir (mean
tropical eutrophic
depth = 6.5 m;
Roberto
water supply
volume = 8.0 106
water supply
Suárez;
reservoir, Paso
m3) is a small raw
reservoir, Paso
Marc Beutel;
Bonito Reservoir,
water reservoir in
Bonito Reservoir,
Seyoum
Cuba
south-central Cuba.
Cuba
Gebremariam
8141
This study evaluated sources of high levels of manganese in the reservoir causing taste and odor problems. Watershed monitoring showed that levels of total manganese (Mn) and total iron (Fe) were high (Mn 0.14-0.64 mg/L; Fe 5.3-12.4 mg/L) during the first flood of the wet season in river sampling stations near historical pyrite mining operations. Monitoring in the reservoir showed that Mn and Fe were present in bottom waters throughout the year, with peak levels (>8 mg/L of Mn and >30 mg/L of Fe) coinciding with low levels of oxygen in summer months. Empirical modeling of Mn concentration in the reservoir water column showed that it correlated significantly with Fe (positive correlation), redox potential (negative correlation) and dissolved oxygen (negative correlation). Statistical evaluation of the temporal cycle of Mn in raw water delivered to the Juan Gonzales Water Treatment Plant showed that Mn accumulation was highly seasonal, peaking annually around September when dissolved oxygen in raw water was at a minimum. Data suggest that during first-flood conditions early in the wet season, mass loading of Mn and Fe from the watershed to the reservoir is high. During the subsequent drier low-flow summer period, external mass loading of metals drops dramatically and the reservoir becomes a large exporter of Mn and Fe as the metals are internally recycled under anaerobic conditions in bottom waters.
Food web effects
Roland W.
Lake and
and the
Wang; Lars
Reservoir
disappearance of
G. Rudstam;
Management
the spring clear
1040-2381
0743-
26
3
2010
169 -
Food web effects
The annual spring
177
and the
clear water phase
disappearance of
(May-June) in
Thomas E.
the spring clear
Onondaga Lake,
water phase in
Brooking;
water phase in
New York,
Onondaga Lake
David J.
Onondaga Lake
unexpectedly
following nutrient
Snyder; Mark
following nutrient
disappeared in 2003
loading reductions
A. Arrigo;
loading reductions
following several
8141
Edward L.
years of phosphorus
Mills
and ammonia loading reductions at the Metropolitan Syracuse Wastewater Treatment Facility (Metro). Mean chlorophyll a concentration during May-June was higher from 2003 to 2007 than from 1990 to 2002, with mean Secchi disk depths