James Cloern (Former Employee)
Science and Products
Filter Total Items: 104
A cold phase of the East Pacific triggers new phytoplankton blooms in San Francisco Bay A cold phase of the East Pacific triggers new phytoplankton blooms in San Francisco Bay
Ecological observations sustained over decades often reveal abrupt changes in biological communities that signal altered ecosystem states. We report a large shift in the biological communities of San Francisco Bay, first detected as increasing phytoplankton biomass and occurrences of new seasonal blooms that began in 1999. This phytoplankton increase is paradoxical because it occurred in...
Authors
James E. Cloern, Alan D. Jassby, Janet K. Thompson, Kathryn Hieb
Eutrophication of freshwater and marine ecosystems Eutrophication of freshwater and marine ecosystems
Initial understanding of the links between nutrients and aquatic productivity originated in Europe in the early 1900s, and our knowledge base has expanded greatly during the past 40 yr. This explosion of eutrophication-related research has made it unequivocally clear that a comprehensive strategy to prevent excessive amounts of nitrogen and phosphorus from entering our waterways is...
Authors
Val H. Smith, Samantha B. Joye, Robert W. Howarth
Ecological values of shallow-water habitats: Implications for the restoration of disturbed ecosystems Ecological values of shallow-water habitats: Implications for the restoration of disturbed ecosystems
A presumed value of shallow-habitat enhanced pelagic productivity derives from the principle that in nutrient-rich aquatic systems phytoplankton growth rate is controlled by light availability, which varies inversely with habitat depth. We measured a set of biological indicators across the gradient of habitat depth within the Sacramento–San Joaquin River Delta (California) to test the...
Authors
C.B. Lopez, J. E. Cloern, T.S. Schraga, A.J. Little, L.V. Lucas, J.K. Thompson, J.R. Burau
Heat wave brings an unprecedented red tide to San Francisco Bay Heat wave brings an unprecedented red tide to San Francisco Bay
An exceptional red tide in San Francisco Bay was observed on 8 September 2004. The red tide had chlorophyll concentrations approaching 200 mg/m3 (Figure 1) in red/purple surface streaks containing high abundances of the dinoflagellate Akashiwo sanguinea. Red tides and harmful algal blooms (HABs) are common features of coastal ecosystems, and their growing frequency is a suspected outcome...
Authors
James E. Cloern, Tara S. Schraga, Cary B. Lopez
Detritus fuels ecosystem metabolism but not metazoan food webs in San Francisco estuary's freshwater delta Detritus fuels ecosystem metabolism but not metazoan food webs in San Francisco estuary's freshwater delta
Detritus from terrestrial ecosystems is the major source of organic matter in many streams, rivers, and estuaries, yet the role of detritus in supporting pelagic food webs is debated. We examined the importance of detritus to secondary productivity in the Sacramento and San Joaquin River Delta (California, United States), a large complex of tidal freshwater habitats. The Delta ecosystem...
Authors
W. V. Sobczak, J. E. Cloern, A.D. Jassby, B.E. Cole, T.S. Schraga, A. Arnsberg
Science and Products
Filter Total Items: 104
A cold phase of the East Pacific triggers new phytoplankton blooms in San Francisco Bay A cold phase of the East Pacific triggers new phytoplankton blooms in San Francisco Bay
Ecological observations sustained over decades often reveal abrupt changes in biological communities that signal altered ecosystem states. We report a large shift in the biological communities of San Francisco Bay, first detected as increasing phytoplankton biomass and occurrences of new seasonal blooms that began in 1999. This phytoplankton increase is paradoxical because it occurred in...
Authors
James E. Cloern, Alan D. Jassby, Janet K. Thompson, Kathryn Hieb
Eutrophication of freshwater and marine ecosystems Eutrophication of freshwater and marine ecosystems
Initial understanding of the links between nutrients and aquatic productivity originated in Europe in the early 1900s, and our knowledge base has expanded greatly during the past 40 yr. This explosion of eutrophication-related research has made it unequivocally clear that a comprehensive strategy to prevent excessive amounts of nitrogen and phosphorus from entering our waterways is...
Authors
Val H. Smith, Samantha B. Joye, Robert W. Howarth
Ecological values of shallow-water habitats: Implications for the restoration of disturbed ecosystems Ecological values of shallow-water habitats: Implications for the restoration of disturbed ecosystems
A presumed value of shallow-habitat enhanced pelagic productivity derives from the principle that in nutrient-rich aquatic systems phytoplankton growth rate is controlled by light availability, which varies inversely with habitat depth. We measured a set of biological indicators across the gradient of habitat depth within the Sacramento–San Joaquin River Delta (California) to test the...
Authors
C.B. Lopez, J. E. Cloern, T.S. Schraga, A.J. Little, L.V. Lucas, J.K. Thompson, J.R. Burau
Heat wave brings an unprecedented red tide to San Francisco Bay Heat wave brings an unprecedented red tide to San Francisco Bay
An exceptional red tide in San Francisco Bay was observed on 8 September 2004. The red tide had chlorophyll concentrations approaching 200 mg/m3 (Figure 1) in red/purple surface streaks containing high abundances of the dinoflagellate Akashiwo sanguinea. Red tides and harmful algal blooms (HABs) are common features of coastal ecosystems, and their growing frequency is a suspected outcome...
Authors
James E. Cloern, Tara S. Schraga, Cary B. Lopez
Detritus fuels ecosystem metabolism but not metazoan food webs in San Francisco estuary's freshwater delta Detritus fuels ecosystem metabolism but not metazoan food webs in San Francisco estuary's freshwater delta
Detritus from terrestrial ecosystems is the major source of organic matter in many streams, rivers, and estuaries, yet the role of detritus in supporting pelagic food webs is debated. We examined the importance of detritus to secondary productivity in the Sacramento and San Joaquin River Delta (California, United States), a large complex of tidal freshwater habitats. The Delta ecosystem...
Authors
W. V. Sobczak, J. E. Cloern, A.D. Jassby, B.E. Cole, T.S. Schraga, A. Arnsberg