Isa Woo (Former Employee)
Science and Products
Filter Total Items: 15
Tidal marsh biomass field plot and remote sensing datasets for six regions in the conterminous United States (ver. 2.0, June 2020) Tidal marsh biomass field plot and remote sensing datasets for six regions in the conterminous United States (ver. 2.0, June 2020)
Remote sensing based maps of tidal marshes, both of their extents and carbon stocks, have the potential to play a key role in conducting greenhouse gas inventories and implementing climate mitigation policies. Our objective was to generate a single remote sensing model of tidal marsh aboveground biomass and carbon that represents nationally diverse tidal marshes within the conterminous...
Small mammal surveys from northern San Francisco Bay: 1998-2014 Small mammal surveys from northern San Francisco Bay: 1998-2014
This datasets summarizes small mammal trapping efforts that USGS San Francisco Bay Estuary Field Station has led, co-led, or supervised, to detect and monitor the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in the northern reaches of San Francisco Bay from 1998-2014. As the salt marsh harvest mouse is listed as endangered under the Endangered Species Act, sensitive...
Historical Time-series Classification of Habitat for 1957, 1980 and 2015 in the Nisqually River Delta, Washington Historical Time-series Classification of Habitat for 1957, 1980 and 2015 in the Nisqually River Delta, Washington
This USGS Data Release represents geospatial and tabular data for the Nisqually River Delta historical habitat mapping. The data release was produced in compliance with the new 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. The dataset consists of 9 separate items: 1. Forest Change (raster...
Filter Total Items: 40
Small shorebirds feast on green slime to fuel their long migration Small shorebirds feast on green slime to fuel their long migration
Shorebirds wade in shallow waters along shorelines searching for food. More than a million shorebirds visit the San Francisco Estuary each year during their migration to feast on the insects, worms, clams, and crabs that live on or under the surface of the sand or mud. The abundant food in the Estuary provides shorebirds with the energy they need to migrate thousands of kilometers...
Authors
Laurie Anne Hall, Susan E.W. De La Cruz, Isa Woo, Tomohiro Kuwae, David Mcgovern Nelson, John Y. Takekawa
Age‐ and sex‐related dietary specialization facilitate seasonal resource partitioning in a migratory shorebird Age‐ and sex‐related dietary specialization facilitate seasonal resource partitioning in a migratory shorebird
Dietary specialization is common in animals and has important implications for individual fitness, inter‐ and intraspecific competition, and the adaptive potential of a species. Diet composition can be influenced by age‐ and sex‐related factors including an individual's morphology, social status, and acquired skills; however, specialization may only be necessary when competition is...
Authors
Laurie Anne Hall, Susan E.W. De La Cruz, Isa Woo, Tomohiro Kuwae, John Y. Takekawa
Impacts of periodic dredging on macroinvertebrate prey availability for benthic foraging fishes in central San Francisco Bay, California Impacts of periodic dredging on macroinvertebrate prey availability for benthic foraging fishes in central San Francisco Bay, California
Background Because of its importance for species covered under Federal Fishery Management Plans (FMPs), the San Francisco Bay (SFB) estuary has been designated as Essential Fish Habitat (EFH) under the Magnuson-Stevens Fishery Conservation and Management Act (MSA; 16 United States Code §18559b). Within this estuary, benthic macroinvertebrate communities provide important prey resources...
Authors
Susan E. W. De La Cruz, Isa Woo, Laurie Hall, Alison Flanagan, Hannah Mittelstaedt
Rediscovery of the horseshoe shrimp Lightiella serendipita Jones, 1961 (Cephalocarida: Hutchinsoniellidae) in San Francisco Bay, California, USA, with a key to the worldwide species of Cephalocarida Rediscovery of the horseshoe shrimp Lightiella serendipita Jones, 1961 (Cephalocarida: Hutchinsoniellidae) in San Francisco Bay, California, USA, with a key to the worldwide species of Cephalocarida
Lightiella serendipitaJones, 1961 was first discovered in San Francisco Bay, California in 1953, but it had not been observed since 1988. In 2017, a total of 13 adult L. serendipita specimens were found as part of a study in central San Francisco Bay, nearly doubling the total number of specimens ever collected. We measured vertical distribution of macroinvertebrates and environmental...
Authors
Crystal Garcia, Isa Woo, D. Christopher Rogers, Alison M Flanagan, Susan E.W. De La Cruz
Carbon sources in the sediments of a restoring vs. historically unaltered salt marsh Carbon sources in the sediments of a restoring vs. historically unaltered salt marsh
Salt marshes provide the important ecosystem service of carbon storage in their sediments; however, little is known about the sources of such carbon and whether they differ between historically unaltered and restoring systems. In this study, stable isotope analysis was used to quantify carbon sources in a restoring, sparsely vegetated marsh (Restoring) and an adjacent, historically...
Authors
Judith Z. Drexler, Melanie J. Davis, Isa Woo, Susan E.W. De La Cruz
Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay
Understanding habitat associations is vital for conservation of at‐risk marsh‐endemic wildlife species, particularly those under threat from sea level rise. We modeled environmental and habitat associations of the marsh‐endemic, Federally endangered salt marsh harvest mouse (Reithrodontomys raviventris, RERA) and co‐occurrence with eight associated small mammal species from annual trap...
Authors
Bruce G. Marcot, Isa Woo, Karen M. Thorne, Chase M. Freeman, Glenn R. Guntenspergen
Disentangling the effects of habitat biogeochemistry, food web structure, and diet composition on mercury bioaccumulation in a wetland bird Disentangling the effects of habitat biogeochemistry, food web structure, and diet composition on mercury bioaccumulation in a wetland bird
Methylmercury (MeHg) is a globally pervasive contaminant with known toxicity to humans and wildlife. Several sources of variation can lead to spatial differences in MeHg bioaccumulation within a species including: biogeochemical processes that influence MeHg production and availability within an organism’s home range; trophic positions of consumers and MeHg biomagnification efficiency in...
Authors
Laurie Anne Hall, Isa Woo, Mark C. Marvin-DiPasquale, Danika C Tsao, David P. Krabbenhoft, John Y. Takekawa, Susan E.W. De La Cruz
Development and implementation of an empirical habitat change model and decision support tool for estuarine ecosystems Development and implementation of an empirical habitat change model and decision support tool for estuarine ecosystems
Widespread land use change in coastal ecosystems has led to a decline in the amount of habitat available for fish and wildlife, lower production of ecosystem goods and services, and loss of recreational and aesthetic value. This has prompted global efforts to restore the natural hydrologic regimes of developed shorelines, especially resource-rich estuaries, but the resilience of these...
Authors
Melanie J. Davis, Isa Woo, Susan E.W. De La Cruz
A mosaic of estuarine habitat types with prey resources from multiple environmental strata supports a diversified foraging portfolio for juvenile Chinook salmon A mosaic of estuarine habitat types with prey resources from multiple environmental strata supports a diversified foraging portfolio for juvenile Chinook salmon
Estuaries provide vital nursery habitat for threatened Chinook salmon (Oncorhynchus tshawytscha) by promoting an ecological portfolio effect, whereby multiple habitat types and environmental strata maximize foraging opportunities for out-migrating salmon by varying the abundance and composition of prey through space and time. To study this portfolio effect, we evaluated the foraging...
Authors
Isa Woo, Melanie J. Davis, Christopher S. Ellings, Sayre Hodgson, John Y. Takekawa, Glynnis Nakai, Susan E.W. De La Cruz
Carbon accumulation and vertical accretion in a restored vs. historic salt marsh in southern Puget Sound, Washington, United States Carbon accumulation and vertical accretion in a restored vs. historic salt marsh in southern Puget Sound, Washington, United States
Few comparisons exist between vertical accretion (VA) and carbon accumulation rates (CARs), in restored vs. historic (i.e., reference) marshes. Here we compare these processes in a formerly diked, sparsely vegetated, restored salt marsh (Six Gill Slough, SG), whose surface is subsided relative to the tidal frame, to an adjacent, relatively pristine, historic salt marsh (Animal Slough, AS...
Authors
Judith Z. Drexler, Isa Woo, Christopher C. Fuller, Glynnis Nakai
Freshwater tidal forests and estuarine wetlands may confer early life growth advantages for delta-reared Chinook Salmon Freshwater tidal forests and estuarine wetlands may confer early life growth advantages for delta-reared Chinook Salmon
Large river deltas are complex ecosystems that are believed to play a pivotal role in promoting the early marine growth and survival of threatened Chinook Salmon Oncorhynchus tshawytscha. We used a fish bioenergetics model to assess the functional role of multiple delta habitats across a gradient of salinities and vegetation types, where consumption and growth rate potential (GRP) were...
Authors
Melanie J. Davis, Isa Woo, Christopher S. Ellings, Sayre Hodgson, David A. Beauchamp, Glynnis Nakai, Susan E.W. De La Cruz
Changes in aquatic prey resources in response to estuary restoration in Willapa Bay, southwestern Washington Changes in aquatic prey resources in response to estuary restoration in Willapa Bay, southwestern Washington
Executive Summary The ongoing restoration of more than 200 hectares of estuarine habitat at Willapa National Wildlife Refuge, southwestern Washington, is expected to benefit a variety of species, including salmonids that use estuarine and tidal marshes as rearing and feeding areas as well as migratory waterbirds. During March–June 2014 and 2015, U.S. Geological Survey Western Ecological...
Authors
Isa Woo, Melanie J. Davis, Susan E.W. De La Cruz
Science and Products
Filter Total Items: 15
Tidal marsh biomass field plot and remote sensing datasets for six regions in the conterminous United States (ver. 2.0, June 2020) Tidal marsh biomass field plot and remote sensing datasets for six regions in the conterminous United States (ver. 2.0, June 2020)
Remote sensing based maps of tidal marshes, both of their extents and carbon stocks, have the potential to play a key role in conducting greenhouse gas inventories and implementing climate mitigation policies. Our objective was to generate a single remote sensing model of tidal marsh aboveground biomass and carbon that represents nationally diverse tidal marshes within the conterminous...
Small mammal surveys from northern San Francisco Bay: 1998-2014 Small mammal surveys from northern San Francisco Bay: 1998-2014
This datasets summarizes small mammal trapping efforts that USGS San Francisco Bay Estuary Field Station has led, co-led, or supervised, to detect and monitor the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in the northern reaches of San Francisco Bay from 1998-2014. As the salt marsh harvest mouse is listed as endangered under the Endangered Species Act, sensitive...
Historical Time-series Classification of Habitat for 1957, 1980 and 2015 in the Nisqually River Delta, Washington Historical Time-series Classification of Habitat for 1957, 1980 and 2015 in the Nisqually River Delta, Washington
This USGS Data Release represents geospatial and tabular data for the Nisqually River Delta historical habitat mapping. The data release was produced in compliance with the new 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. The dataset consists of 9 separate items: 1. Forest Change (raster...
Filter Total Items: 40
Small shorebirds feast on green slime to fuel their long migration Small shorebirds feast on green slime to fuel their long migration
Shorebirds wade in shallow waters along shorelines searching for food. More than a million shorebirds visit the San Francisco Estuary each year during their migration to feast on the insects, worms, clams, and crabs that live on or under the surface of the sand or mud. The abundant food in the Estuary provides shorebirds with the energy they need to migrate thousands of kilometers...
Authors
Laurie Anne Hall, Susan E.W. De La Cruz, Isa Woo, Tomohiro Kuwae, David Mcgovern Nelson, John Y. Takekawa
Age‐ and sex‐related dietary specialization facilitate seasonal resource partitioning in a migratory shorebird Age‐ and sex‐related dietary specialization facilitate seasonal resource partitioning in a migratory shorebird
Dietary specialization is common in animals and has important implications for individual fitness, inter‐ and intraspecific competition, and the adaptive potential of a species. Diet composition can be influenced by age‐ and sex‐related factors including an individual's morphology, social status, and acquired skills; however, specialization may only be necessary when competition is...
Authors
Laurie Anne Hall, Susan E.W. De La Cruz, Isa Woo, Tomohiro Kuwae, John Y. Takekawa
Impacts of periodic dredging on macroinvertebrate prey availability for benthic foraging fishes in central San Francisco Bay, California Impacts of periodic dredging on macroinvertebrate prey availability for benthic foraging fishes in central San Francisco Bay, California
Background Because of its importance for species covered under Federal Fishery Management Plans (FMPs), the San Francisco Bay (SFB) estuary has been designated as Essential Fish Habitat (EFH) under the Magnuson-Stevens Fishery Conservation and Management Act (MSA; 16 United States Code §18559b). Within this estuary, benthic macroinvertebrate communities provide important prey resources...
Authors
Susan E. W. De La Cruz, Isa Woo, Laurie Hall, Alison Flanagan, Hannah Mittelstaedt
Rediscovery of the horseshoe shrimp Lightiella serendipita Jones, 1961 (Cephalocarida: Hutchinsoniellidae) in San Francisco Bay, California, USA, with a key to the worldwide species of Cephalocarida Rediscovery of the horseshoe shrimp Lightiella serendipita Jones, 1961 (Cephalocarida: Hutchinsoniellidae) in San Francisco Bay, California, USA, with a key to the worldwide species of Cephalocarida
Lightiella serendipitaJones, 1961 was first discovered in San Francisco Bay, California in 1953, but it had not been observed since 1988. In 2017, a total of 13 adult L. serendipita specimens were found as part of a study in central San Francisco Bay, nearly doubling the total number of specimens ever collected. We measured vertical distribution of macroinvertebrates and environmental...
Authors
Crystal Garcia, Isa Woo, D. Christopher Rogers, Alison M Flanagan, Susan E.W. De La Cruz
Carbon sources in the sediments of a restoring vs. historically unaltered salt marsh Carbon sources in the sediments of a restoring vs. historically unaltered salt marsh
Salt marshes provide the important ecosystem service of carbon storage in their sediments; however, little is known about the sources of such carbon and whether they differ between historically unaltered and restoring systems. In this study, stable isotope analysis was used to quantify carbon sources in a restoring, sparsely vegetated marsh (Restoring) and an adjacent, historically...
Authors
Judith Z. Drexler, Melanie J. Davis, Isa Woo, Susan E.W. De La Cruz
Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay
Understanding habitat associations is vital for conservation of at‐risk marsh‐endemic wildlife species, particularly those under threat from sea level rise. We modeled environmental and habitat associations of the marsh‐endemic, Federally endangered salt marsh harvest mouse (Reithrodontomys raviventris, RERA) and co‐occurrence with eight associated small mammal species from annual trap...
Authors
Bruce G. Marcot, Isa Woo, Karen M. Thorne, Chase M. Freeman, Glenn R. Guntenspergen
Disentangling the effects of habitat biogeochemistry, food web structure, and diet composition on mercury bioaccumulation in a wetland bird Disentangling the effects of habitat biogeochemistry, food web structure, and diet composition on mercury bioaccumulation in a wetland bird
Methylmercury (MeHg) is a globally pervasive contaminant with known toxicity to humans and wildlife. Several sources of variation can lead to spatial differences in MeHg bioaccumulation within a species including: biogeochemical processes that influence MeHg production and availability within an organism’s home range; trophic positions of consumers and MeHg biomagnification efficiency in...
Authors
Laurie Anne Hall, Isa Woo, Mark C. Marvin-DiPasquale, Danika C Tsao, David P. Krabbenhoft, John Y. Takekawa, Susan E.W. De La Cruz
Development and implementation of an empirical habitat change model and decision support tool for estuarine ecosystems Development and implementation of an empirical habitat change model and decision support tool for estuarine ecosystems
Widespread land use change in coastal ecosystems has led to a decline in the amount of habitat available for fish and wildlife, lower production of ecosystem goods and services, and loss of recreational and aesthetic value. This has prompted global efforts to restore the natural hydrologic regimes of developed shorelines, especially resource-rich estuaries, but the resilience of these...
Authors
Melanie J. Davis, Isa Woo, Susan E.W. De La Cruz
A mosaic of estuarine habitat types with prey resources from multiple environmental strata supports a diversified foraging portfolio for juvenile Chinook salmon A mosaic of estuarine habitat types with prey resources from multiple environmental strata supports a diversified foraging portfolio for juvenile Chinook salmon
Estuaries provide vital nursery habitat for threatened Chinook salmon (Oncorhynchus tshawytscha) by promoting an ecological portfolio effect, whereby multiple habitat types and environmental strata maximize foraging opportunities for out-migrating salmon by varying the abundance and composition of prey through space and time. To study this portfolio effect, we evaluated the foraging...
Authors
Isa Woo, Melanie J. Davis, Christopher S. Ellings, Sayre Hodgson, John Y. Takekawa, Glynnis Nakai, Susan E.W. De La Cruz
Carbon accumulation and vertical accretion in a restored vs. historic salt marsh in southern Puget Sound, Washington, United States Carbon accumulation and vertical accretion in a restored vs. historic salt marsh in southern Puget Sound, Washington, United States
Few comparisons exist between vertical accretion (VA) and carbon accumulation rates (CARs), in restored vs. historic (i.e., reference) marshes. Here we compare these processes in a formerly diked, sparsely vegetated, restored salt marsh (Six Gill Slough, SG), whose surface is subsided relative to the tidal frame, to an adjacent, relatively pristine, historic salt marsh (Animal Slough, AS...
Authors
Judith Z. Drexler, Isa Woo, Christopher C. Fuller, Glynnis Nakai
Freshwater tidal forests and estuarine wetlands may confer early life growth advantages for delta-reared Chinook Salmon Freshwater tidal forests and estuarine wetlands may confer early life growth advantages for delta-reared Chinook Salmon
Large river deltas are complex ecosystems that are believed to play a pivotal role in promoting the early marine growth and survival of threatened Chinook Salmon Oncorhynchus tshawytscha. We used a fish bioenergetics model to assess the functional role of multiple delta habitats across a gradient of salinities and vegetation types, where consumption and growth rate potential (GRP) were...
Authors
Melanie J. Davis, Isa Woo, Christopher S. Ellings, Sayre Hodgson, David A. Beauchamp, Glynnis Nakai, Susan E.W. De La Cruz
Changes in aquatic prey resources in response to estuary restoration in Willapa Bay, southwestern Washington Changes in aquatic prey resources in response to estuary restoration in Willapa Bay, southwestern Washington
Executive Summary The ongoing restoration of more than 200 hectares of estuarine habitat at Willapa National Wildlife Refuge, southwestern Washington, is expected to benefit a variety of species, including salmonids that use estuarine and tidal marshes as rearing and feeding areas as well as migratory waterbirds. During March–June 2014 and 2015, U.S. Geological Survey Western Ecological...
Authors
Isa Woo, Melanie J. Davis, Susan E.W. De La Cruz