History of Fish Presence and Absence Following Lake
Acidification and Recovery in Lake Minnewaska,
Shawangunk Ridge, NY
David M. Charifson, Paul C. Huth, John E. Thompson, Robert K. Angyal, Michael J. Flaherty, and David C. Richardson
Northeastern Naturalist, Volume 22, Issue 4 (2015): 762–781
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D.M. Charifson, P.C. Huth, J.E. Thompson, R.K. Angyal, M.J. Flaherty, and D.C. Richardson
22001155 NORTHEASTERN NATURALIST 2V2(o4l). :2726,2 N–7o8. 14
History of Fish Presence and Absence Following Lake
Acidification and Recovery in Lake Minnewaska,
Shawangunk Ridge, NY
David M. Charifson1, 2, Paul C. Huth3, John E. Thompson3, Robert K. Angyal4,
Michael J. Flaherty4, and David C. Richardson1,*
Abstract - Lake acidification is a major problem in northeastern US lakes that can control
fish presence or absence. We examined the history of fish populations in Lake Minnewaska,
in eastern New York. We examined historical documents and found that Lake Minnewaska
was fishless from 1922–2008 because of high lake-acidity. Following 30 years of recovery
from acidic conditions, Notemigonus crysoleucas (Golden Shiner), a small minnow species,
was introduced in 2008 and quickly proliferated, peaking at ~15,000 individuals in 2013. In
2012, the piscivorous species Micropterus salmoides (Largemouth Bass) was introduced,
and the minnow population was effectively removed by 2014. We present a conceptual
model of the history of fish in Lake Minnewaska as fish disappeared and reappeared over
100 years as a consequence of acid rain and human introductions .
Introduction
Fish communities are integral components of most aquatic ecosystems and play
key roles in linking lower trophic levels to top predators within and outside of their
aquatic boundaries (Vander Zanden and Vadeboncoeur 2002). Fish communities
also provide ecosystem goods and services on which humans rely (Palmer and
Richardson 2009). Species presence and population size are cont rolled by both biotic
and abiotic factors, with spatial scale playing a strong role in mediating these
dynamics (Jackson et al. 2001). The community of fish species able to migrate to
any given lake is ultimately controlled by the regional-species pool and anthropogenic
introductions. Biotic and abiotic factors in lakes regulate the presence of
fish species from the regional pool as well as the growth of each population. Biotic
factors include bottom-up controls via reduction or increase in food sources, and
top-down controls via predation and interspecific competition (e .g., Trumpickas et
al. 2011). There are 3 categories of abiotic factors that control fish communities:
physical habitat and habitat accessibility, climatic factors, and water chemistry,
including dissolved oxygen and acidity (Beisner et al. 2006, Jackson et al. 2001,
Jeppensen et al. 2010).
Lake acidity is particularly important in determining fish species presence/
absence and fish-community structure, depending on species’ tolerance for low
1Biology Department, SUNY New Paltz, 1 Hawk Drive, New Paltz, NY 12561. 2Department
of Ecology and Evolution, Stony Brook University, Stony Brook, NY 11790. 3Mohonk Preserve,
PO Box 715, New Paltz, NY 12561. 4New York State Department of Environmental
Conservation, 21 South Putt Corners Road, New Paltz, NY 12561. *Corresponding author
- richardsond@newpaltz.edu.
Manuscript Editor: Craig Purchase
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pH. Acidity can cause deleterious physiological and behavioral responses and the
extirpation of fish populations through direct fish kills, especially those species
sensitive to decreasing pH (Matuszek et al. 1990). With slow increases in acidity,
fish experience behavioral modifications, morphological deformities, and impairment
of chemoreception (Mount 1973, Ore et al. 1997). For example, Pimephales
promelas Rafinesque (Fathead Minnow) can survive at pH 5–6, but behavior is
abnormal, swimming patterns are modified, and stress levels appear to increase
(Mount 1973). At pH < 6, morphological deformities appear; male Fathead Minnows
may be hunch-backed and have smaller-than-average heads (Mount 1973).
For multiple species, fish reproduction is sensitive to lake acidification; reduced
egg production and viability have been documented when pH < 6 (Eaton et al.
1992, Mount 1973).
Lake acidification in the northeastern US became a problem in the 19th and
20th centuries following industrial intensification at local and regional scales
and continual increases in anthropogenically driven sulfate and NOx emissions to
the atmosphere (Likens et al. 2005). Anthropogenic emissions cause decreases in
the pH of precipitation, and prevailing west-to-east winds push the acidic fronts
to the Northeast. Acidic precipitation has been a problem for fish populations,
and some communities in acidified lakes have lost species richness or entire fish
populations (e.g., Driscoll et al. 1991). The potential for impacts of lake acidification
are moderated by the underlying geology in the watershed and the lake’s
position in the landscape (Driscoll et al. 2003a, b). For example, lakes located
on quartz or granite bedrock are more susceptible to acidification than those on
shale or carbonate-rich lithology with high inherent buffering capacity. In the
northeastern US, there are over 7000 lakes with underlying geology that make
them susceptible to acidification as a result of acid rain (Brakke et al. 1988).
Since enactment of the 1990 Clean Air Act amendment, there has been a general
increase in the pH of rain across the Northeast, resulting in moderate recovery of
susceptible, acidified lakes (Greaver et al. 2012).
Lake acidification in the Sudbury region of Ontario, Canada, is well-studied and
provides many interesting parallels to our study system, Lake Minnewaska, and the
other lakes of the Shawangunk Ridge, NY. Mining and smelting operations in Sudbury
were extensive, and released copious amounts of sulfur and trace-metal
emissions into the air, which led to acidification of both local and regional aquatic
systems (Dixit et al. 1992a). The lakes of Killarney Provincial Park in the La Cloche
Mountains, nearby Sudbury, have thin, sandy soils, with quartzite bedrock that
provided little buffering capacity to overlaying aquatic systems, increasing their
susceptibility to acidification (Dixit et al. 1992a, b; Keller et al. 2003). A study of 3
lakes in Killarney Provincial Park estimated the progression of and recovery from
acidification during the period spanning the pre-industrial period to the late 1980s
using diatom and chrysophyte records in sediment cores as environmental indicators
(Dixit et al. 1992b). The 3 lakes were generally slightly acidic with pH values
of ~5.5–6.2 prior to industrialization. They started to acidify further around 1920–
1930, reached a pH minimum (pH ≈ 4 for the most acidic of the studied lakes)
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between 1970–1980, and began to recover soon after (Dixit et al. 1992b). Lakes far
to the east of Sudbury in the Atlantic Provinces of Canada were also acidified, but
have not shown nearly as much recovery, despite large decreases in acid deposition
(Clair et al. 2011, Jeffries et al. 2003).
Fish populations were greatly altered by acid deposition in the lakes near Sudbury,
Canada (e.g., Beamish 1974, Gunn and Keller 1990). However, biological
recovery has been noted in many of these lakes. For example, in 1980, Whitepine
Lake (pH of <5.5) contained abundant Perca flavescens Mitchill (Yellow Perch),
an acid-tolerant species, but sensitive species like Salvelinus namaycush Walbaum
(Lake Trout) and Catostomus commersonii Lacépède (White Sucker) were rare and
not able to reproduce (Gunn and Keller 1990). With increases in pH and buffering
capacity, Lake Trout began to reproduce in the lake in 1982; the catch-per-effort
rate for juvenile Lake Trout increased by a factor of 50 from 1982 to 1987 (Gunn
and Keller 1990).
Similarly, the lakes across New York State, especially in the Adirondack and
Catskill mountain ranges, have been affected by the increase and more-recent decrease
of acid rain. Adirondack mountain lakes are susceptible to acid rain because
of weather patterns that deposit large volumes of low-pH precipitation in lakes
with little acid-buffering capacity due to underlying bedrock geology (Driscoll et
al. 2003b). Paleolimnological evidence supports that this acidification occurred
between the 1920s and 1970s (Charles et al. 1990). In the Adirondacks, the proportion
of lakes with low pH and without fish went from 4% in the 1930s to 46% in
the 1970s (Schofield 1976), but recovery has taken place since the implementation
of the 1990 Clean Air Act amendment. The percentage of acidic Adirondack lakes
with acid-neutralizing capacity of <0 μeq L-1 has dropped from 15% down to 8% of
all lakes (Waller et al. 2012), with implications for the recovery of fish populations.
For example, Honnedaga Lake lost acid-sensitive fish from 1920 to 1960, leaving
only Salvelinus fontinalis Mitchill (Brook Trout) extant until the late 1970s when
the Brook Trout were extirpated from the lake (Josephson et al. 2014). Following
recovery from acid rain and associated changes in water chemistry through the
1990s, Brook Trout were able to recolonize Honnedaga Lake by 2000, although
there has been minimal recovery of other acid-sensitive species like White Sucker
(Josephson et al. 2014).
Similar to lakes in eastern Canada and the northeastern US, waterbodies along
the Shawangunk Ridge (Fig. 1), at the foot of the Catskill Mountain range in southeastern
New York, have also experienced extirpation of fish populations as a direct
result of local and regional acid rain. The aim of our research was to examine the
history of fish presence and absence in Lake Minnewaska, one of 5 sky lakes on
the Shawangunk Ridge. Fish reappeared in Lake Minnewaska in 2008 following
86 y without fish due to acidic lake waters. We had 2 specific research objectives
with different methodological approaches. First, we wanted to determine how
fish-population size and composition changed in Lake Minnewaska between the
late 1800s and 2008. Scientific data was lacking for much of that period; thus,
we examined reports, historical documents, and personal anecdotes to elucidate
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the history of fish in Lake Minnewaska. Second, following the fish reintroduction
in 2008, we sought to describe changes in fish population size, age structure,
and species composition. We established a scientific protocol for evaluation of
fish-population and community dynamics, including the evaluation of population
size via catch–mark–recapture techniques. We measured, aged, and identified fish
for several years. Herein, we present a general conceptual model of the history of
fish in Lake Minnewaska as fish appeared, disappeared, and reappeared over more
than 150 y as a consequence of acid rain and human introductions. This conceptual
model helps to establish a context and goals for management decisions regarding
fish introduction in the other Shawangunk Lakes.
Site Description
Lake Minnewaska (41°43'41''N, 74°14'10''W) is one of 5 glacial sky lakes located
in the Shawangunk Ridge of southeastern New York (Fig. 1). The sky lakes
(Maratanza, Haseco, Awosting, Minnewaska, Mohonk; Fig. 1) lie atop the Shawangunk
Formation, which is composed of weathering-resistant quartz-conglomerate
of middle Silurian age (Epstein 1993). This bedrock produces shallow, acidic soils,
and releases few acid-neutralizing ions into surrounding waters, similar to lakes
with underlying quartzite bedrock in Killarney Provincial Park, ON (Dixit et al.
1992a, b). The Shawangunk conglomerate lies above the Ordovician Martinsburg
Formation and is composed of shale beds (Epstein 1993). Lake Minnewaska is glacial
in origin—it was gouged out during the last glacial retreat (Peteet et al. 2009).
The lake has a surface area of 18.6 ha, a maximum depth of 23.4 m (Fig. 1), and an
elevation of ~503 m above sea level. The Lake Minnewaska watershed is small; the
lake itself contains ~45% of the total surface area of its watershed (Kiviat 1988).
The lake has no inlets and only a single outlet that has intermittent surface-flow.
These characteristics make Lake Minnewaska primarily rain-fed, and therefore
sensitive to acid precipitation.
Methods
History of fish in Lake Minnewaska
The Smiley family, founders and owners of the Mohonk Mountain House since
1869, have collected observations of fish in Lake Minnewaska over the past 145
years. Daniel Smiley compiled records and stories from local historians, researchers,
and ecologists, and consulted with fisheries experts at the regional office of
the New York State Department of Environmental Conservation (NYSDEC). We
have synthesized these and other historical records into a conceptual framework of
the history of fish in Lake Minnewaska with bounds on fish presence prior to our
study. We include a history of fish in both Lake Minnewaska and a nearby sky lake,
Awosting, which is currently fishless. The conceptual framework for fish occupation
of Lake Minnewaska (Fig. 2) includes high uncertainty for fish presence and
population sizes based on lack of scientific data.
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2015 Vol. 22, No. 4
Figure 1. Location of the Northern Shawangunk Ridge and Lake Minnwaska (black diamond)
in the Hudson Valley, NY (41º43'41''N, 74º14'10''W. The sky lakes (top inset) are
highlighted in circles from southwest to northeast: lakes Maratanza, Haseco, Awosting,
Minnewaska, and Mohonk. Data and topographic map for this inset from Google accessed
14 May 2015. Lake Minnewaska bathymetry (bottom left inset) depths are in 4-m intervals
with the deepest location in the northern part of the lake (ope n diamond) at 23.4 m.
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Catch–mark–recapture
During 2012–2014, we measured total length of fish captured via net-seining
and electrofishing in Lake Minnewaska as described below. In 2013 and 2014, we
estimated fish-population sizes in Lake Minnewaska using catch–mark–recapture
techniques. Only 2 fish species have been found in the lake during the past 6 years:
Micropterus salmoides Lacépède (Largemouth Bass) and Notemigonus crysoleucas
Mitchill (Golden Shiner). We marked both species by clipping the dorsal portion
of the caudal fin. Under laboratory conditions, swimming ability was not obviously
affected by fin clips, and the mark was clearly noticeable for 1.5 months. During
summer 2013, we initially caught fish by seining multiple times at several locations.
We recaptured fish by electrofishing. In summer 2014, we employed electrofishing
techniques for both the capture and recapture phases. For electrofishing, we
used a Smith-Root 4.9-m electrofishing boat (Smith-Root, Vancouver, WA) with
2 bow scrapers during each collection run. We operated the electrofishing boat at
1000V, 120 pps DC drawing 5A for all samples, with the exception of the 17 June
2014 sample when the boat was inadvertently operated in AC mode. Operating in
AC may be less efficient, resulting in a decreased catch/effort, but since this was
the marking run of a mark–recapture sample effort, the change did not affect the
final fish-population estimates. We conducted all sampling beginning roughly at
sunset, and each run consisted of a minimum of 1 circuit of the shoreline of Lake
Minnewaska. The habitat for Largemouth Bass and Golden Shiner is better along
the southern shore; thus, we often made another pass up that shore in an attempt
to collect more fish. However, each time we did this, the habitat-specific catch rate
for both species appeared to decline from the earlier pass. Additionally, on 30 June
2014, we made 1 linear run up the middle of the lake and back with the objective
of sampling any pelagic Golden Shiners that may have been present. We completed
all electrofishing by 23:00. We calculated population-size estimates (N) using Peterson’s
method (Krebs 1998) such that
N = ([M + 1] [C + 1] / [R + 1]) - 1,
Figure 2. Conceptual model
of fish presence in Lake
Minnewaska with the yaxis
representing relative
fish abundance. The shaded
region represents relative
fish abundance with
thickness indicating uncertainty,
based on anecdotal
evidence and historical records
prior to 2012 and
population estimates after
2012. The horizontal line
between 1922 and 2008
indicates total absence of
fish.
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2015 Vol. 22, No. 4
where N is the population size, M is the number of initially marked individuals, C
is the sample size of the recaptured individuals, and R is the marked, recaptured
individuals. We determined 95% confidence intervals using the Poisson distribution
due to a small number (<10%) of recaptures relative to fish marked originally
(Krebs 1998) as follows:
CI = ([M + 1] [C + 1] / X) - 1,
where X = 1.051 for the upper 95% confidence limit and X = 6.323 for the lower
95% confidence limit. We used a t-test to compare the estimated population size
between 2013 and 2014 for each species. We compared average-fish length among
years (2012–2014) using either a 2-sample t-test when 2 years of data were available
or a 1-way ANOVA when more than 2 years of data were available. We conducted
all statistical analyses and verification that the data met assumptions of
normality with the R statistical package (R Core Team 2013).
Age estimation from scales
To estimate fish age, we collected scale samples from behind 1 of the pectoral
fins of a subset of Largemouth Bass and from between the dorsal fin and the lateral
line of 5 Golden Shiners per cm–length group. We heat-pressed scale samples into
acetate plastic, and inspected them under magnification with a microfiche reader.
We estimated ages by counting annular marks on the individual scales, following
the general methods described by Jearld (1983).
We were confident that our Largemouth Bass age estimates were accurate.
However, NYSDEC staff in this region typically do not age Golden Shiners,
so our experience with this species was very limited. We noted apparent check
marks in the pattern of circuli on some of these samples that did not exhibit the
spacing expected from true annuli; thus, the age estimates of Golden Shiner
should be used with some caution. We applied a simple linear regression between
fish size and age for each species to derive an equation for converting
mean size to age in each year.
Changes in limnological parameters following fish intr oduction
We compiled all available limnological (physical, biological, and chemical parameters)
data—including pH, Secchi depth, chlorophyll a (chl a) concentration,
total phosphorus (TP) concentration, specific conductivity, and occurrences of
anoxia in the hypolimnion prior to and following fish introduction in 2008—from
primary-literature sources and New York State reports for Lake Minnewaska. In
2012 and 2013, we measured the above variables at 4 shallow locations around
the edge of the lake and at the deep site in the surface waters (Fig. 1). We used
standard spectrophotometric methods for chl a and TP concentrations (Richardson
et al. 2014). We averaged all data prior to fish introduction (1922–2008) and post
fish introduction (2009–2014), and when data was available for the period prior to
2009, we performed a 2-sample t-test to test the difference of limnological variables
before and after fish introduction.
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Results
Local and regional acid rain in the Shawangunk Ridge
Industry, both locally and regionally, was increasing rapidly in the early 20th
century and might have contributed to decreasing air quality resulting in the acidification
of the lakes. There were many potential sources of air pollution to the south
and west of the Shawangunk Ridge that, following prevailing wind patterns, passed
over the sky lakes. During the 19th century, the regional demand for wood products
exploded to support industrial growth, and settlers were hired to cut Shawangunk
Ridge forests for tanbark, barrel-hoop poles, charcoal production, and cordwood
harvest (Josephson and Larsen 2013, Thompson and Huth 2011). Charcoal production
and deforestation occurred across the Ridge and likely resulted in poor air
quality and transport of heavy particles over short distances from the earth-mound
and pit-kiln charcoal-production fires (e.g., Pennise et al. 2001, Straka 2014,
Thompson and Huth 2011). There was substantial zinc, lead, and copper smelting
within 10 km of Lake Minnewaska in Ellenville, NY, where forges and iron blastfurnaces
worked 24 h per day (Josephson and Larsen 2013, Thompson and Huth
2011). During the 19th and 20th centuries, the railroads expanded on both sides of
the Shawangunk Ridge, and the fuel load for the furnaces switched from locally
harvested wood and charcoal to coal and coke, which is a high-carbon–content fuel
manufactured from coal (Josephson and Larsen 2013). Industrialization expanded
nationally throughout the early 20th century, and many lakes became increasingly
acidic (Likens et al. 2005).
History of fish in Lake Minnewaska prior to 2008
Lake Minnewaska and all of the other sky lakes are glacial in origin with waterfalls
along their outlet streams that restrict fish migration. Fish dispersal into Lake
Minnewaska was probably prevented by these geographic barriers despite the likelihood
that pH was high enough for fish survival and reproduction. However, there
is historical evidence that fish were present in the sky lakes during the 19th century,
possibly due to introductions by humans (Table 1). A reasonable alternative is that
for a period following the retreat of the last glacier, the landscape did not contain
geographic barriers to fish dispersal into the lake. The first non-indigenous settlement
and forestry activity on the Shawangunk Ridge dates to about 1799. There is
little record of land use in the early 1800s. In the mid-1800s, George Davis, a settler,
owned Lake Minnewaska but rarely saw it, indicating that he did not use the lake for
fishing before selling the property and lake to Alfred Smiley, owner of the nearby
Mohonk Mountain House (Josephson and Larsen 2013). Calvin Burger, a hunting
guide on the mountain, had a boat on the lake prior to the sale of the lake and land to
Alfred Smiley (Josephson and Larsen 2013); it is possible that he fished for sustenance
or as recreation for visiting (and paying) tourists. It is unlikely that the Smiley
brothers stocked the lake with fish from Mohonk given that they would have recorded
it in their meticulous naturalist records (e.g., Cook et al. 2008). Prior to the 20th
century, loggers or stonecutters could have stocked Lake Minnewaska with several
species of fish as a food source for nearby logging camps. Similar procedures have
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been documented for other sites in northern New York and New England where logging
companies sent teams to stock nearby lakes with easily caught fish species for
food at the camps a decade before logging an area (Brokaw and Lucas 2008). This
possibility is supported by the documented 19th-century presence in the sky lakes of
2 fish species that were often used in stocking lakes and ponds for logging camps—
Esox niger Lesueur (Chain Pickerel) and Yellow Perch (Table 1; Brokaw and Lucas
2008). The date of the last fish recorded in Lake Minnewaska was in 1922 when
300 Yellow Perch were collected following the dynamiting of the lake to retrieve a
drowning victim (Table 1, Fig. 3). After that, Lake Minnewaska and the other sky
lakes were too acidic to support the fish populations. In 1957, for example, 1500
trout from various species were stocked in nearby Lake Awosting, which had acidity
similar to that of Lake Minnewaska; within 4–5 days, most of the trout were dead
(Smiley and Huth 1983).
Reintroduction of fish in 2008
In 2008, individual Golden Shiners were first spotted in Lake Minnewaska, and
the population increased rapidly over the next few years until schools of the fish were
visible to all visitors to the lake (D.C. Richardson, pers. observ.). Golden Shiners may
have been dumped in 2008 as leftover bait fish from a day of unsuccessful fishing at
Lake Minnewaska or introduced through illegal stocking. In 2012, we observed clear
populations of Golden Shiners in the shallows around the entire lake that were easy
to catch via beach seining. In 2013, we estimated the Golden Shiner population size
at 15,320 ± 5300 (mean ± SE); however, in 2014, we found no Golden Shiners. This
result represents an abrupt and statistically significant decrease (t = 3.35, P < 0.001,
df = 327; Fig. 4). We first observed Largemouth Bass in 2012. We surmise that in 2012,
Largemouth Bass were dumped as fry or as larger fish by an angler who saw a possible
fishing location with sufficient prey species to support a bass population. The
Table 1. History of fish presence in 2 lakes on the Shawangunk Ridge. For the column labeled Verifiable,
Yes = an account with photographic or written record (primary source) for the given time and
species and No = anecdotes of local people or a written secondary source. Dates prior to 2009 are
from Smiley and Huth (1983), dates after are the observations o f the authors.
Lake Minnewaska Lake Awosting
Year(s) Species present Verifiable? Year(s) Species present Verifiable?
1878 Trout spp.A No 1878 Yellow Perch Yes
1879 Chain Pickerel No 1889 Chain Pickerel Yes
Prior to 1914 Yellow Perch No 1889 Yellow Perch No
Prior to 1914 Chain Pickerel No 1901–1903 Chain Pickerel No
1922 Yellow PerchB Yes 1909C Chain Pickerel No
2009–2013 Golden Shiner Yes 1956D Trout spp. Yes
2012–present Largemouth Bass Yes
A7 individuals found dead; only known occurrence of this species at Minnewaska.
BLast known occurrence of fish at Lake Minnewaska, prior to reint roduction in 2009.
CLast recorded natural occurrence of fish at Lake Awosting.
DLake Awosting was stocked with 1500 trout from various species. Nearl y all died within 5 days.
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population across all size classes of Largemouth Bass increased from 869 ± 471 (mean
± SE) individuals in 2013 to 1380 ± 770 in 2014. Although the population increased
by 60%, this difference was not significant (t = 0.54, P = 0.59, df = 157; Fig. 4) due to a
large standard error caused by the small number of individuals recaptured.
Figure 3. Photograph of the last known fish in Lake Minnewaska prior to reintroduction in
2008 showing ~60 Yellow Perch of the 300 that died following dynamiting of the lake to
recover a drowning victim in 1922. Published with permission from the Mohonk Preserve,
Alfred F. Smiley collection.
Figure 4. Populationsize
estimates of N.
crysoleucas (Golden
Shiner) and M.
salmoides (Largemouth
Bass) in Lake
Minnewaska. Dark
gray and light gray
are 2013 and 2014,
respectively. Error
bars represent 95%
confidence intervals
constructed using the
Poisson distribution.
No Golden Shiners
were found in 2014.
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Mean Golden Shiner size was 82 ± 19.7 mm in 2012 and 90 ± 14.0 mm (mean ±
SD) in 2013, a significant increase in mean fish size (t = -3.3, df = 104, P = 0.001;
Fig. 5). Golden Shiner length (mm) was positively and linearly related to fish age
(y): 0.022–0.25 (fish length) (F1, 67 = 47, P < 0.001, r2 = 0.41; Fig. 6). Using the
length–age regression yielded average-age estimates of 1.5 years in 2012 and 1.7
years in 2013. Mean Largemouth Bass size was 149.8 ± 113.0 mm, 113.1 ± 68.0
mm, and 168.8 ± 61.2 (mean ± SD) in 2012, 2013, and 2014 respectively (Fig. 7).
Size was a significant main effect (1-way ANOVA: F2,203 = 39, P < 0.001) with
posthoc means comparisons indicating that mean size significantly increased from
2013 to 2014 but neither 2013 nor 2014 were different from 2012 likely due to
small sample size (n = 4 Largemouth Bass caught). There was a significant positive
linear relationship between fish length (mm) and age (y) in Largemouth Bass: age =
0.012 (length) (F1, 40 = 138, P < 0.001, r2 = 0.78; Fig. 6). Largemouth Bass average
age was calculated as 2.0 y in 2012, 1.6 y in 2013, and 2.3 y i n 2014.
Changes in limnological parameters following fish intr oduction
Data from regular measurements in the 1970s show that the lake was acidic
with pH ≈ 4.5 (Table 2; Rubin 1982). Between 1991 to 2013, pH increased more
rapidly in Lake Minnewaska than the other acidified sky lakes on the Shawangunk
Ridge and was closer to neutral at pH 6.1 in recent years (Table 2). This trend began
before the fish were introduced, but pH has continued to increase following
Figure 5. Histograms of
N. crysoleucas (Golden
Shiner) length in 2012 (n
= 85) and 2013 (n = 361).
No Golden Shiners were
present in 2014.
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fish introduction. Lake Minnewaska underwent a recent increase in productivity
and decrease in transparency following fish introduction (Table 2). Before fish
introduction, the lake was oligotrophic with low TP and chl a concentrations and
extremely high transparency (>6 m; Table 2). Following the Golden Shiner introduction,
chl a and TP concentrations increased, transparency became much lower,
and benthic anoxia was present in the hypolimnion; these facts all indicate the lake
has transitioned to a mesotrophic condition (Table 2). Changes in variables relating
Figure 6. Regressions of fish length (mm) and age (y) of N. crysoleucas (Golden Shiner, top)
and M. salmoides (Largemouth Bass, bottom).
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2015 Vol. 22, No. 4
to lake productivity are associated with the introduction of fish, likely through a
trophic cascade. Increases in TP may be due to greater internal cycling of nutrients
in the lake (benthic-feeding fish excreting into the water column) or to the release
of phosphorus from iron complexes in sediment under both neutral pH and anoxic
conditions (Wetzel 2001). All data indicate that Lake Minnewaska has always had
low specific conductivity (Table 2).
Figure 7. Histograms of
M. salmoides (Largemouth
Bass) length in 2012 (n = 4),
2013 (n = 94), and 2014 (n =
108).
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2015
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Discussion
The history of fish presence in Lake Minnewaska is linked to human activity.
Fish were likely introduced in the 18th or 19th century and remained in the lake
until pH decreased below a critical threshold for survival or reproduction. Lake
Minnewaska pH has steadily increased over the past 40 years from pH = 4 in the
1970s to pH = 6.5 in 2014; we hypothesize this change is a result of recovery from
acid rain, the loss of a large mat of Sphagnum trinitense Müller (Trinity Sphagnum)
(van Breeman 1995), and addition of eroding, neutralizing shale from hiking trails
that circumscribe the lake. Since 1999, the lake pH > 5.5 and could support acidtolerant
fish (Kretser et al. 1989).
A subset of Adirondack lakes with extirpated fish populations are also recovering
from acidification. There has been a resurgence of acid-tolerant Brook Trout
in Lake Honnedaga since 2000 (Josephson et al. 2014). Compared to Lake Minnewaska,
the change in pH at Lake Honnedaga has been minimal, but the return of
fish has been hastened by a tributary system that provided refugia for fish (Josephson
et al. 2014). Lake Minnewaska’s single outlet stream is intermittent and has
waterfalls impassable to fish, thus preventing dispersal of fish into the lake (D.M.
Charifson, SUNY Stony Brook, NY, pers. comm.). Lake Minnewaska is one of 5
sky lakes on the Shawangunk Ridge, 4 of which were acidified and had a pH of
4–4.5 by the 1970s (Rubin 1982). Extirpation of fish in the Shawangunk Ridge occurred
earlier than in the Adirondacks. Eighty percent (4/5) of lakes were fishless
due to acidification by 1922, while only 4% of lakes in the Adirondack Mountains
were fishless because of low pH by 1930; the percentage of acidic fishless lakes in
the Adirondacks grew to 46% by the 1970s (Schofield 1976).
We are less certain of the timing of fish loss in the other sky lakes. Fish were
present in each lake in the late 19th century, but we must rely on historical accounts
and anecdotal evidence (i.e., fish stories) to estimate past fish diversity.
Table 2. Pre-fish (prior to 2009) and post-fish (2009 and later) means ± standard deviations of several
key limnological variables. Chl a = chlorophyll a concentration and TP = total phosphorus concentration.
T-test P-value indicates significant difference between pre- and post-fish values with associated
degrees of freedom (df) for the heterogeneous variances comparison.
Pre-fish Post-fish t-test Years with
mean mean P-value df available data
pH 5.2 ± 0.6 6.1 ± 0.3 less than 0.001 220 1970–2013
Secchi depth (m) 6.1 ± 1.8 2.9 ± 0.8 0.003 9 1989, 2000–2013
Chl a (μg/L) 0.9 ± 0.3A 4.4 ± 2.5 less than 0.001 41 1989, 1992, 2012–2013
TP (μg/L) 12.8 ± 3.5B 22.9 ± 14.6 less than 0.001 49 2004, 2009, 2011–2013
Specific conductivity (μS/cm) 50.7C 21.7 ± 11.7 NA NA 1972–1974, 2012–2013
Anoxia in hypolimnion NoD Yes - - 1992, 2000–2013
AFrom Baines and Pace (1994); Cole and Pace (1995).
BNew York State Environmental Management Bureau, Albany, NY, unpubl. data; Cole et al. (1993).
CRubin (1982), one value converted from 1972–1974 average in meq /L.
DCole and Pace (1995); New York State Environmental Management Bureau, Albany, NY, unpubl.
data.
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2015 Vol. 22, No. 4
Reliable historical records show that Yellow Perch and Chain Pickerel were present
in another sky lake, Lake Awosting, prior to 1910 (Smiley and Huth 1983) but
extensive fishing effort between 1915 and 1921 in Lake Awosting yielded no fish.
Another sky lake, Lake Mohonk, was never acidified, has been stocked with game
fish since 1871, and had pre-existing fish populations prior to stocking (Smiley
and Huth 1983).
The reintroduction of fish to Lake Minnewaska has caused numerous changes
in whole-lake community structure. From 2010 to 2013, zooplanktivorous Golden
Shiners likely suppressed zooplankton populations and contributed to internal
loading of epilimnetic phosphorus. Both factors combined to result in increased
phytoplankton biomass measured as pelagic chl a. Since the Golden Shiner has
apparently been extirpated, the lake may see a decrease in producer biomass as
zooplankton are released from predation. In fact, we saw transparency increase
throughout the summer of 2014 to a maximum 6 m in early fall (D.C. Richardson
et al., unpubl. data). Fishless lakes have rich and characteristic amphibian and
macroinvertebrate communities and experience losses of these organisms with fish
introductions (Bull and Marx 2002, Hecnar and M’Closkey 1997, Schilling et al.
2009). After fish introduction, Lake Minnewaska saw losses in amphibian-species
richness and changes to macroinvertebrate-community composistion (Jorgensen
2012, L. Townley, New York State Environmental Management Bureau, Albany,
NY, pers. comm.). The loss of the aquatic bryophyte, Trinity Sphagnum, appears to
predate the fish introduction, but is likely linked to the changing pH. Temporal and
spatial patterns of increased benthic coverage of Sphagnum spp. with decreasing
pH have been observed in several acidified lakes in Sweden (Grahn 1977), so the
converse could be true with Trinity Sphagnum greatly reduced or even extirpated
by recovery from acidification in Lake Minnewaska. However, Sphagnum is an
ecosystem engineer that acidifies its environment through production of organic
acids; thus, we cannot rule out the possibility that recovery in Lake Minnewaksa
was in part caused by the loss of Trinity Sphagnum (van Breeman 1995).
We did not observe Golden Shiners in Lake Minnewaska in the summer of 2014
during electrofishing and diving surveys. This apparent extirpation likely occurred
as a result of Largemouth Bass predation. Largemouth Bass increased in length
by 56 mm between 2013 and 2014, resulting in larger fish with bigger gape sizes
which enhanced their ability to consume larger Golden Shiners. The introduction or
increased abundance of predatory fish can greatly reduce the populations of its prey
species. When the Lake Trout population of Whitepine Lake began to increase due
to increasing pH, the abundance of Yellow Perch decreased dramatically (Gunn and
Keller 1990). Without the zooplanktivorous minnows, the lake will be trophically
structured by piscivores like nearby Lake Mohonk, likely leading to changes in the
zooplankton community via a trophic cascade (Carpenter et al. 1 987).
The remaining fishless sky lakes are too acidic for most fish species. During
summer the summer of 2013, the pH of each of the other 3 sky lakes was below
5.0 (D. Richardson et al., unpubl. data). As the remaining fishless sky lakes
slowly recover from acidification, it may be possible for them to support fish.
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D.M. Charifson, P.C. Huth, J.E. Thompson, R.K. Angyal, M.J. Flaherty, and D.C. Richardson
2015
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The pH of Lake Awosting has been slowly recovering over the past 22 years (J.E.
Thompson et al., unpubl. data). If recovery in Lake Awosting continues linearly,
the average pH will be 5.5 by ~2060, a pH suitable for survival of acid-tolerant
fish species. However, fish will not be able to disperse into the lake without human
aid due to geographic barriers.
The reintroduction of fish to Lake Minnewaska can be viewed from multiple
conservation perspectives. The lake is clearly on the road to recovery from anthropogenic
acidification, although the introduction of fish has led to decreased
abundance and extirpation of species with atypical behaviors that were only able to
inhabit the lake in the absence of fish. For example, Bahret (1996) found that the
Lake Minnewaska population of Eurycea bislineata Green (Northern Two-lined
Salamander) exhibited no parental care of eggs and had a wide dispersal of eggs
across habitats and depths—behaviors that have only been documented within
Lake Minnewaska. The once crystal-clear waters had become green and opaque for
several years, likely due to fish reintroduction, much to the dismay of visitors to
Minnewaska State Park Preserve; however, we saw some recovery in transparency
in 2014 following Golden Shiner loss. Little information is known about the state
of the lake prior to acidification; however, a New York Times article indicated that
the water was so clear that a white object could be seen ~9 m (30 feet) below the
surface of Lake Minnewaska during the 1870s (NYT 1876). Management goals
for Lake Minnewaska must be established in the context of what is known about
its history and ecology. After further study of the ecosystem effects of the Largemouth
Bass population, managers could begin a series of regular removals of fish
by electrofishing to return the lake to a fishless state. Removal of fish may, to an
extent, restore some of the uncommon community and ecosystem characteristics
that existed historically, but successful fish reintroductions in the future remain a
possibility due to increased pH.
Acknowledgments
This research was funded by grants and awards from the SUNY New Paltz Summer
Undergraduate Research Experience program, SUNY New Paltz School of Science and
Engineering, and the New York State Water Resources Institute to D.C. Richardson,
J.E. Thompson, and Kathleen Weathers, and National Science Foundation Research Opportunity
Award to D.C. Richardson as a supplement to NSF DEB #1144627 (Jon Cole,
Principal Investigator). The Mohonk Preserve and NYS Environmental Management
Bureau were crucial partners and contributed data and resources to this project. Jon Cole
was helpful in providing data from previous publications. We thank the New York State
Department of Environmental Conservation for assistance with electrofishing and volunteers
for late night sampling. B. Albers, S. Dimeglio, M. Forcella, B. Krebs, S. Mogil, K.
Munger, K. Myers, J. Odin, V. Stanson, and E. Stern assisted in field sampling, lab work,
data collection, and analysis. S. Dimeglio and K. Cappillino were instrumental in creating
Figure 1. Numerous volunteers from the Richardson and Chowdhury labs from SUNY
New Paltz helped with field work. We thank Minnewaska State Park Preserve (especially
Jorge Gomes and Eric Humphrey) for permission to conduct research within the Park
boundaries and for general assistance.
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2015 Vol. 22, No. 4
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