Trend, seasonality, cycle, and irregular fluctuations in primary productivity at Lake Tahoe, California-Nevada, USA

  title={Trend, seasonality, cycle, and irregular fluctuations in primary productivity at Lake Tahoe, California-Nevada, USA},
  author={Alan D. Jassby and Charles Remington Goldman and Thomas M. Powell},
Primary productivity has been measured routinely at Lake Tahoe since 1967, and a number of mechanisms underlying variability in the productivity record have now been identified. A long-term trend due to nutrient loading dominates the series. Seasonality also is prominent, apparently controlled by direct physical factors unrelated to the trophic cascade. A 3-yr cycle has been detected and several possible mechanisms are considered. Irregular fluctuations also are present, caused in part by… 
Patterns and mechanisms of phytoplankton variability in Lake Washington (USA).
Annual primary production: Patterns and mechanisms of change in a nutrient‐rich tidal ecosystem
Although nutrient supply often underlies long‐term changes in aquatic primary production, other regulatory processes can be important. The Sacramento‐San Joaquin River Delta, a complex of tidal
The Warming of Lake Tahoe
SummaryWe investigated the effects of climate variability on the thermal structure of Lake Tahoe, California-Nevada, 1970–2002, and with principal components analysis and step-wise multiple
Aerosol‐nutrient‐induced picoplankton growth in Lake Tahoe
Lake Tahoe is an oligotrophic lake appreciated for its transparent waters, yet the Lake's clarity has been declining for several decades due in part to eutrophication. At the same time, a shift from
Phytoplankton production in Italian freshwater and marine ecosystems: State of the art and perspectives
The present work aims at evaluating the state of art of phytoplankton production research in Italy. We present a synthesis of the main results achieved in three ecosystems where primary production
Water quality response to the Angora Fire, Lake Tahoe, California
The Angora Fire (summer of 2007) was the largest and most severe wildfire in recent history within the Lake Tahoe basin of the Sierra Nevada. To determine the watershed response and to assess the
Time series of multivariate data in aquatic ecology
Coupling of multivariate methods and time series analysis can be ueful for studying dynamics of aquatic communities. This is demonstratred with a data set from the pelagic area of an
Results suggest that the elevated levels of dissolved oxygen are associated with the dinoflagellate, P. aciculiferum, of Arrowwood Lake, and that this bloom was most likely the result of an excystment event rather than a general growth response.
A plea for more ecology in phytoplankton ecology
It is suggested that it is advantageous to tackle eutrophication from the perspective of general ecology, rather than from a specifically planktonic orientation, and useful general ecological tools, for example, time series and assembly-rule studies, can be used.


Interannual fluctuations in primary production: Meteorological forcing at two subalpine lakes
Meteorological factors are associated with most of the interannual variability in primary production at both Castle Lake, California (4 l”N, 122%‘) and Lake Tahoe, California-Nevada (39”N, 12O”W). At
Interannual fluctuations in primary production: Direct physical effects and the trohic cascade at Castle Lake, California
Direct physical effects and cascading trophic interactions operate together to determine interannual variability in the seasonal pattern .of primary productivity at Castle Lake, California. Principal
Mixing and the dynamics of the deep chlorophyll maximum in Lake Tahoe
Chlorophyll-temperature profiles were measured across Lake Tahoe about every 10 days from April through July 1980. Analysis of the 123 profiles and associated productivity and nutrient data
Spring Mixing Depth as a Determinant of Annual Primary Production in Lakes
Year-to-year fluctuations in spring mixing depth are a major source of interannual variation in primary production at Lake Tahoe, California-Nevada. The morphology of the Tahoe basin predisposes the
Primary productivity, nutrients, and transparency during the early onset of eutrophication in ultra‐oligotrophic Lake Tahoe, Califomia‐Nevada1
For more than half a century, the trophic status of water bodies has been of interest to Iimnologists and oceanographers alike. This report demonstrates the close, inverse relationship between
Temporal Variation in a Paleolimnological Record Arising from a Trophic Cascade
Results indicate that some of the variance in this paleolimnological record is due to the trophic cascade, which may arise from terrestrial or climatic processes.
Snow goose migration phenology is related to extratropical storm climate
The phenologies of autumn and spring migrations by greater snow geese (Anser caerulescens atlantica) are shown to be statistically independent. Spring and fall migration phenologies are demonstrated
Sustained viability of aphotic phytoplankton in Lake Tahoe (California‐Nevada)
Biomass, chlorophyll a, and photosynthetic potential of phytoplankton were measured year-round throughout a 450-m water column of ultraoligotrophic Lake Tahoe. Phytoplankton biomass was uniform from
Detecting Ecosystem Responses to Anthropogenic Stress
Recent ecological work on aquatic populations, communities, and ecosystems is reviewed for advances which show promise as early indicators of anthropogenic stress in aquatic ecosystems. Work at the
Temporal Variation, Spatial Heterogeneity, and Competition for Resources in Plankton Systems: A Theoretical Model
This model of two species competing for two resources in a spatially nonuniform environment based upon the experience with phytoplankton competing for nutrients in lakes and the ocean shows much more variable behavior in space and time than the usual smooth approach to coexistence seen in previous resource competition models.