Zooplankton Seasonal Succession in Lake Ontario at Northshore, Midlake, and Southshore Stations in 1982, and a Comparison with 1970

Taylor, William D.; Fricker, H.-J.; Lean, D. R. S.

doi:10.1139/f87-267

Cited by 32 publications

(7 citation statements)

References 24 publications

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“…We have shown that the sediment record provides evidence of recent changes in the trophic state of Lake Ontario when no evidence of such change, except for a qualitative change in diatom populations (Johannsson et al 1985), has been found in other limnological investigations (Johannsson et al 1985;Lean et al 1987;Stevens and Neilson 1987;Gray 1987;Taylor et al 1987). Detecting trends in real time is complicated by interannual and shorter term variability in trophic state variables (Harris 1986) which are poorly resolved by conventional sampling.…”

Section: Conchionsmentioning

confidence: 68%

Recent changes in productivity and climate of Lake Ontario detected by isotopic analysis of sediments

Schelske

Hodeli

1991

Limnology & Oceanography

239

119

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Cores from Lake Ontario provide a record of lake :rcsponses to increased phosphorus loading that began after early forest clearance in the mid-1800s. We measured1XY2C ratios of organic and inorganic C (calcite) in the sediments to infer recent .trends in primary production. The 6% of organic C increased in response to historic increases in P enrichment until the mid-1970s and then decreased in response to reduced P loading. The 6°C of calcite increased after 1940 but did not decrease in response to reduced P loading. We conclude that the results differ because 8°C of organic C is determined by primary production early in the seasonal cycle when flux of organic C to the sediments is greatest, whereas 6°C of calcite depends on the isotopic composition of dissolved inorganic C during late summer when calcite is precipitated.Calcite accumulation and its 613C ratio oscillated after 1940 with peaks estimated at 1948, 1966, 1977, and 1983. These peaks correspond to minima in ,6'*0 values, indicating calcite precipitation at higher temperature, and to years of early thermal stratification. We hypothesize that calcite accumulation and its stable isotopic ratios are controlled by interannual variability in onset of thermal stratification of the lake. Our results thus suggest a direct link from climate (i.e. thermal stratification) to interannual variation in lake productivity and to carbonate precipitation and its 6% signature. Lake Ontario is a large (19,700 km*), P-limited system in which long-term increases in production of organic matter were undoubtedly regulated by supplies of P (Schelske et al. 1988;Lean et al. 1987). Its sediments provide a historic record of lake productivity and exhibit a two-stage response to P loading (Schelske et al. 1988; Stoermer et al. 1985~). The first stage occurred after 1850, following early settlement and forest clearance by settlers, and is marked by an increase in biogenic silica and organic C flux to the sediments (Schelske et al. 1983(Schelske et al. , 1988. The second stage occurred AcknowledgmentsWe acknowledge Mark Brenner and the late E. S. Deevey for reading the manuscript and providing facilities and assistance with analyses of total carbon. We thank Jose Garrido for laboratory assistance with coulometric titration and Roger Bachmann for assistance with calculations of stable isotopic ratios of carbon resulting from changes in primary production. We also thank two anonymous reviewers for criticism of our interpretation of results and for their role in refining our model.

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Section: Conchionsmentioning

confidence: 68%

Recent changes in productivity and climate of Lake Ontario detected by isotopic analysis of sediments

Schelske

Hodeli

1991

Limnology & Oceanography

239

119

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“…The dynamic nature of this aspect of the zooplankton community (Dimension 2) in comparison to the relative seasonal stability of Dimension 1 in Middleton Pond, suggests that different mechanisms are influencing these two components of the zooplankton community. The zooplankton communities of some lakes and reservoirs are thought to follow fairly well characterized patterns of successional development and these seasonal patterns may be repeatable year after year (e.g., DeMott, 1983;Kratz et al, 1987;Taylor et al, 1987;Hu & Tessier, 1995). Indeed, even when a lake undergoes a series of fish additions and removals, each of which is likely to affect the zooplankton, there exists a high degree of repeatability in how zooplankton, or groups of zooplankton, respond to changes in the level of planktivory (He et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Seasonal Patterns of Abundance: Do Zooplankton in Small Ponds do the Same Thing Every Spring–Summer?

2006

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Small ponds ( £ 2 ha) are often a common landscape feature, but their ecology has been less well studied than that of lakes. Studies of some lakes and reservoirs show among-year repeatability in the seasonal abundance of different zooplankton (i.e., succession). For small ponds the seasonal dynamics of zooplankton community structure are relatively unstudied, as are any mechanisms underlying these dynamics. We took a community-level approach to studying the spring-summer abundance of zooplankton in two small Ohio ponds. In particular we wanted to know if repeatable patterns exist for zooplankton community structure in these ponds. We surveyed the spring-summer zooplankton communities in the ponds from 2001 to 2003 and used community-level ordination techniques (i.e., non-metric multidimensional scaling, NMDS) to characterize the assemblages. For both ponds the seasonal pattern of total zooplankton abundance differed significantly among years. We found that the proportional abundance of taxa across the season also varied among years. Elements of the zooplankton community, as described by the NMDS dimensions, showed among-year variation in the spring-summer trajectories that developed. Some of the variation in these zooplankton communities was associated with seasonal changes in water temperature. This among-year variation in the seasonal pattern of zooplankton community structure suggests that community dynamics in these small ponds may not be very repeatable. These complex dynamics of zooplankton thus challenges us to improve our characterization of zooplankton communities in small ponds such that we can better understand the factors that drive the patterns we observe.

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“…They attributed the control of algal biomass to the physical transport of lake water masses in lieu of nutrients when the mixing zone depth exceeds that of the euphotic zone. Taylor et al (1987) reported that Lake Ontario zooplankton measured in 1982 did not change in response to changes in nutrient loading and salmonid predators during the 1970s. To examine this discrepancy, Wolin et al (1991) collected a surficial sediment core in 1987 from the Rochester Basin (Fig.…”

Section: Main Lake Regionmentioning

confidence: 99%

The ecological history of Lake Ontario according to phytoplankton

Estepp

Reavie

2015

Journal of Great Lakes Research

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Lake Ontario's condition has fluctuated since European settlement, and our understanding of the linkages between observed ecosystem shifts and stressors is improving. Changes in the physical and chemical environment of the lake due to non-indigenous species, pollution, sedimentation, turbidity, and climate change altered the pelagic primary producers, so algal assessments have been valuable for tracking long-term conditions. We present a chronological account of algal assessments to summarize past and present environmental conditions in Lake Ontario. This review particularly focuses on pelagic, diatom-based assessments as their fossils in sediments have revealed the combined effects of environmental insults and recovery. This review recaps the long-term trends according to three unique regions: Hamilton Harbour, the main lake basin, and the Bay of Quinte. We summarize pre-European impact settlement; eutrophication throughout most of the 20th century; subsequent water quality changes due to nutrient reductions; and filter-feeding dreissenid colonization and contemporary pelagic, shoreline, and embayment impairments. Recent data suggest that although phytoplankton biovolume is stable, species composition has shifted to an increase in densities of spring eutrophic diatoms and summer cyanobacteria. Continued monitoring and evaluation of historical data will assist in understanding and responding to the natural and anthropogenic drivers of Lake Ontario's environmental conditions.

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Zooplankton Seasonal Succession in Lake Ontario at Northshore, Midlake, and Southshore Stations in 1982, and a Comparison with 1970

Cited by 32 publications

References 24 publications

Recent changes in productivity and climate of Lake Ontario detected by isotopic analysis of sediments

Recent changes in productivity and climate of Lake Ontario detected by isotopic analysis of sediments

Seasonal Patterns of Abundance: Do Zooplankton in Small Ponds do the Same Thing Every Spring–Summer?

The ecological history of Lake Ontario according to phytoplankton

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