James Cloern (Former Employee)
Science and Products
Filter Total Items: 104
Microphytobenthos potential productivity estimated in three tidal embayments of the San Francisco Bay system Microphytobenthos potential productivity estimated in three tidal embayments of the San Francisco Bay system
In this paper we describe a three-step procedure to infer the spatial heterogeneity in microphytobenthos primary productivity at the scale of tidal estuaries and embayments. The first step involves local measurement of the carbon assimilation rate of benthic microalgae to determine the parameters of the photosynthesis-irradiance (P-E) curves (using non-linear optimization methods). In...
Authors
Jean-Marc Guarini, James E. Cloern, Jody L. Edmunds, Philippe Gros
Annual primary production: Patterns and mechanisms of change in a nutrient-rich tidal ecosystem 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 waterways forming the landward portion of the San Francisco Estuary, has ample nutrient supplies, enabling us to examine alternate regulatory mechanisms over a 21-yr period. Delta-wide primary...
Authors
Alan D. Jassby, James E. Cloern, B.E. Cole
A comment on the use of flushing time, residence time, and age as transport time scales A comment on the use of flushing time, residence time, and age as transport time scales
Applications of transport time scales are pervasive in biological, hydrologic, and geochemical studies yet these times scales are not consistently defined and applied with rigor in the literature. We compare three transport time scales (flushing time, age, and residence time) commonly used to measure the retention of water or scalar quantities transported with water. We identify the...
Authors
Nancy E. Monsen, James E. Cloern, Lisa V. Lucas, Stephen G. Monismith
Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study
Processes influencing estuarine phytoplankton growth occur over a range of time scales, but many conceptual and numerical models of estuarine phytoplankton production dynamics neglect mechanisms occurring on the shorter (e.g., intratidal) time scales. We used a numerical model to explore the influence of short time-scale variability in phytoplankton sources and sinks on long-term growth...
Authors
L.V. Lucas, J. E. Cloern
Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications
We have now entered an era of large-scale attempts to restore ecological functions and biological communities in impaired ecosystems. Our knowledge base of complex ecosystems and interrelated functions is limited, so the outcomes of specific restoration actions are highly uncertain. One approach for exploring that uncertainty and anticipating the range of possible restoration outcomes is
Authors
L.V. Lucas, J. E. Cloern, J.K. Thompson, N.E. Monsen
Our evolving conceptual model of the coastal eutrophication problem Our evolving conceptual model of the coastal eutrophication problem
A primary focus of coastal science during the past 3 decades has been the question: How does anthropogenic nutrient enrichment cause change in the structure or function of nearshore coastal ecosystems? This theme of environmental science is recent, so our conceptual model of the coastal eutrophication problem continues to change rapidly. In this review, I suggest that the early (Phase I)
Authors
James E. Cloern
Science and Products
Filter Total Items: 104
Microphytobenthos potential productivity estimated in three tidal embayments of the San Francisco Bay system Microphytobenthos potential productivity estimated in three tidal embayments of the San Francisco Bay system
In this paper we describe a three-step procedure to infer the spatial heterogeneity in microphytobenthos primary productivity at the scale of tidal estuaries and embayments. The first step involves local measurement of the carbon assimilation rate of benthic microalgae to determine the parameters of the photosynthesis-irradiance (P-E) curves (using non-linear optimization methods). In...
Authors
Jean-Marc Guarini, James E. Cloern, Jody L. Edmunds, Philippe Gros
Annual primary production: Patterns and mechanisms of change in a nutrient-rich tidal ecosystem 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 waterways forming the landward portion of the San Francisco Estuary, has ample nutrient supplies, enabling us to examine alternate regulatory mechanisms over a 21-yr period. Delta-wide primary...
Authors
Alan D. Jassby, James E. Cloern, B.E. Cole
A comment on the use of flushing time, residence time, and age as transport time scales A comment on the use of flushing time, residence time, and age as transport time scales
Applications of transport time scales are pervasive in biological, hydrologic, and geochemical studies yet these times scales are not consistently defined and applied with rigor in the literature. We compare three transport time scales (flushing time, age, and residence time) commonly used to measure the retention of water or scalar quantities transported with water. We identify the...
Authors
Nancy E. Monsen, James E. Cloern, Lisa V. Lucas, Stephen G. Monismith
Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study
Processes influencing estuarine phytoplankton growth occur over a range of time scales, but many conceptual and numerical models of estuarine phytoplankton production dynamics neglect mechanisms occurring on the shorter (e.g., intratidal) time scales. We used a numerical model to explore the influence of short time-scale variability in phytoplankton sources and sinks on long-term growth...
Authors
L.V. Lucas, J. E. Cloern
Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications
We have now entered an era of large-scale attempts to restore ecological functions and biological communities in impaired ecosystems. Our knowledge base of complex ecosystems and interrelated functions is limited, so the outcomes of specific restoration actions are highly uncertain. One approach for exploring that uncertainty and anticipating the range of possible restoration outcomes is
Authors
L.V. Lucas, J. E. Cloern, J.K. Thompson, N.E. Monsen
Our evolving conceptual model of the coastal eutrophication problem Our evolving conceptual model of the coastal eutrophication problem
A primary focus of coastal science during the past 3 decades has been the question: How does anthropogenic nutrient enrichment cause change in the structure or function of nearshore coastal ecosystems? This theme of environmental science is recent, so our conceptual model of the coastal eutrophication problem continues to change rapidly. In this review, I suggest that the early (Phase I)
Authors
James E. Cloern