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Interagency Ecological Program: Zooplankton and water quality data in the San Francisco Estuary collected by the Summer Townet and Fall Midwater Trawl monitoring programs.
The Interagency Ecological Program’s (IEP) Summer Townet Survey (STN) and Fall Midwater Trawl (FMWT) are two long-term monitoring projects conducted by the California Department of Fish and Wildlife (CDFW) to monitor fish abundance and distribution trends in the San Francisco Estuary (SFE) since 1959 and 1967, respectively. Starting in 2005, zooplankton monitoring was added and paired with fish tows to investigate food availability for young fishes. Food limitation has been a long-term issue and a focus of the Pelagic Organism Decline (POD) studies that began in 2005. By 2011, STN routinely conducted zooplankton monitoring at 40 stations, and FMWT at 32 stations in the upper SFE from Carquinez Strait to the Sacramento Deep Water Ship Channel and into the South Delta. STN samples every other week from June to August and FMWT samples once monthly from September to December. Both projects collect mesozooplankton samples using a modified Clarke-Bumpus (CB) net to target copepods and cladocerans, and FMWT also samples macrozooplankton (i.e. mysids and amphipods) using a mysid net. Flowmeters are used to measure the volume sampled to determine zooplankton catch per unit effort. Environmental variables such as water temperature, turbidity, secchi, and electrical conductivity are collected with each zooplankton sample. Concurrent fish and zooplankton tows conducted by STN and FMWT have allowed for comparisons of fish diet to the available zooplankton prey at the time of collection.
Interagency Ecological Program: Summer Townet Survey for Young Pelagic Fishes in the San Francisco Estuary
The Interagency Ecological Program’s (IEP) Summer Townet Survey (STN) is a long-term effort to monitor the annual recruitment success of young pelagic fishes in the upper San Francisco Estuary (California, United States). Conducted by the California Department of Fish and Wildlife (CDFW) since 1959, STN has sampled fixed locations from Eastern San Pablo Bay to Rio Vista on the Sacramento River, and to Stockton on the San Joaquin River; and a single station in the lower Napa River. The study area was expanded in 2011 to include the Sacramento Deep Water Ship Channel (SDWSC) and Cache Slough (CS). Currently, 40 stations are sampled as a “survey” every other week June through August for 6 surveys. A conical net, lashed to a fixed metal “D” frame, is pulled obliquely through the water column 2 to 3 times at each station. All fish and macro-invertebrates are identified and enumerated from each tow, with fork lengths (mm) of the first 50 of each fish species also recorded. Fish catch, length-frequency, and catch-per-unit-effort (CPUE) among stations is available with data visualization tools on the study website for all species (https://wildlife.ca.gov/Conservation/Delta/Townet-Survey). Data collected at historic 31 stations are used to calculate annual relative abundance indices for age-0 Striped Bass (Morone saxatilis) and Delta Smelt (Hypomesus transpacificus). The remaining 9 stations are sampled to expand our sampling range further upriver and increase our understanding of larval and juvenile fish abundance and distribution in the lower Napa River and the North Delta. A meso-zooplankton net targeting copepods and cladocerans is also used in parallel to assess fish food resources at each station and a subset of the fish collected are retained for diet analysis by CDFW researchers (beginning 2005, see STN and FMWT zooplankton data on EDI). The STN also measures habitat conditions via water temperature (°C), water clarity (Secchi disk depth in cm), Turbidity (NTU) and s
Delta Smelt (Hypomesus transpacificus) biomarker and genetic data from supplemental release into the San Francisco Estuary, 2022
Delta Smelt (Hypomesus transpacificus) is an endangered fish that is endemic to the San Francisco Estuary. As a conservation strategy, hatchery-reared Delta Smelt have been released into the San Francisco Estuary to supplement the wild population. State and federal agencies surveyed the abundance of Delta Smelt, collected fish specimens, and recorded associated environmental data from sampling sites. Delta Smelt specimens were preserved and transported to the University of California, Davis where a variety of biomarkers were assessed on individual fish. This project, including the supplementation of hatchery-reared Delta Smelt and data collection, is ongoing.
Interagency Ecological Program: Data for Synthesis for Ecological Impacts of Drought in the Upper San Francisco Estuary, 1975-2021
These data were collected for the special issue on Drought in the Sacramento-San Joaquin Delta published in San Francisco Estuary and Watershed Sciences, Volume 22, Issue 1, March of 2024. Multi-year droughts are important and impactful features of California’s Mediterranean climate and can fundamentally affect the water quality and the ecosystem response of the San Francisco Estuary and the Sacramento-San Joaquin Delta. This data set was assembled from data collected by long-term monitoring programs over the past 46 years (1975-2021) to evaluate how the estuary changed during multi-year droughts. Data include fish, zooplankton, jellyfish, clams, temperature, Secchi depth, and salinity as measured by fish and water quality surveys, as well as nutrients and chlorophyll measured by water quality surveys. These data are accompanied by hydrologic metrics including Delta Inflow, Delta Outflow, the position of the 2-PSU isohaline, residence time, and daily values of various continuous water quality stations located in the Delta.
Interagency Ecological Program San Francisco Estuary Larval Entrainment Study (LES)
Fish entrainment into California's State Water Project (SWP) and Central Valley Project (CVP) has been a source of mortality for native osmerid species, including Delta Smelt (Hypomesus transpacificus) and Longfin Smelt (Spirinchus thaleichthys). While entrained adult and juvenile fishes are collected, identified and enumerated, the facilities design does not allow for a quantifiable estimate of larval fishes being entrained. This knowledge gap makes it difficult for managers to make scientifically informed decisions regarding the endangered Longfin & Delta Smelt. The Larval Entrainment Study (LES) aims to address this gap by providing a high-resolution dataset and insights into the variable abundances of Smelt at risk of entrainment, the community composition surrounding them, and associated water quality data. Our study design utilizes a variety of gear types and maximizes replicates to improve the understanding of larval Smelt abundances within the southern reach of the Sacramento and San Joaquin River Delta, the zone of entrainment for the SWP and CVP. Sampling began in 2022 using 10-minute stepped oblique tows of a Smelt Larval Survey (SLS) sled mounted with a 500 μm net. Tows were conducted in West Canal, outside Clifton Court Forebay (CCF), where the risk of entrainment is highest. Sampling was conducted five days a week in 2022 and three days a week in the following years. . Beginning in mid-January 2023, a 940 μm mesh net with the same dimensions as the SLS net was added, with sampling alternating between the two. This provided an intermediate gear between SLS (500 μm) and 20mm (1600 μm) nets. In 2024 we expanded to sample a transect of sites within the Old and Middle River (OMR) corridor. This provides broader spatial resolution and improves our ability to detect Osmerids within the South Delta. Sampling alternated between a high priority day (with intensive sampling in the lower San Joaquin River, SLS stations 809 & 812) and a longer transect day that ran
Characterization of Water Quality, Nutrients, and Algae Under Ice in the St. Louis River Estuary 2013 - 2018
This data package includes physical, chemical, and biological measurements characterizing under-ice and early open-water conditions in the St. Louis River Estuary—a freshwater estuary located at the western tip of Lake Superior. Data were collected annually during February and March from 2013 to 2018, with additional sampling in May and June 2018. Sampling sites were distributed across the estuary to assess spatial variability and investigate potential hypoxia. Field data include in situ water quality measurements (e.g., temperature, dissolved oxygen, conductivity, pH), light penetration, and snow and ice thickness. Laboratory analyses were conducted on collected samples to quantify nutrients, suspended sediment, and chlorophyll-a concentrations. Phytoplankton samples were collected using plankton nets and preserved in Lugol’s solution for taxonomic identification. Sampling and analysis followed EPA and USGS Standard Methods where applicable to ensure compatibility with other environmental datasets. This dataset fills a critical gap in winter limnology by providing rare observations of under-ice estuarine conditions. It supports ecological research, environmental monitoring, and comparative studies of seasonal dynamics, nutrient cycling, and primary producer communities in Great Lakes coastal wetlands and other northern freshwater systems. The dataset is complete and not ongoing, although data acquired through the System-wide Monitoring Program at the Lake Superior National Estuarine Research Reserve is complementary and ongoing.
Delta Smelt Enclosure Studies, North Delta Arc of the upper San Francisco Estuary, CA, 2019 - 2024
This dataset comprises data from seven different enclosure studies, each of which used Delta Smelt reared by the UC Davis Fish Conservation and Culture Laboratory (FCCL). Each study had unique study questions and utilized slightly different methods. Enclosure Prototype (Rio Vista (RV) and Sacramento Deep Water Ship Channel (SDWSC)) – these studies, conducted January through February (RV) and March (SDWSC) of 2019, were designed to test different enclosure mesh sizes to assess their effects on Delta Smelt growth, survival, and feeding efficacy over a period of four weeks. Three different enclosure designs were deployed at two locations (Rio Vista and the Sacramento Deep Water Ship Channel), with 60 to 64 fish per enclosure and a control group of 30 fish at FCCL. See Baerwald et al, 2023 for details. - https://doi.org/10.1371/journal.pone.0286027 North Delta Pilot – This study, conducted in July and August of 2019, was implemented to test the feasibility of using enclosures to evaluate a flow action designed to improve food for Delta Smelt in the Yolo Bypass, and test upper thermal limits in field conditions for cultured Delta Smelt. Three enclosures were placed at Rio Vista and one enclosure was placed in the Yolo Bypass. Each enclosure held 60 fish. A control group of 90 fish was held at FCCL. The study lasted for four weeks; however, the Yolo Bypass enclosures were removed after three weeks following a heat wave that was lethal to all enclosure fish at that site. Suisun Marsh Pilot – This study, conducted in October and November of 2019, tested the feasibility of using enclosures to evaluate a flow action designed to improve low salinity habitat for Delta Smelt in Suisun Marsh. Three enclosures per site were placed at three locations (Suisun Marsh, Rio Vista, and the Yolo Bypass). Each enclosure held 60 fish, and a control group of 90 fish was held at FCCL. The study lasted for four weeks. Domestication/Behavior – This study, conducted in January and February of 20
Fish Restoration Program Tidal Wetland Restoration Monitoring in Upper San Francisco Estuary, 2015-ongoing
The Fish Restoration Program Monitoring Team assesses the biological effectiveness of 8,000+ acres of tidal wetland restoration in the Upper San Francisco Estuary (Sacramento-San Joaquin Delta and Suisun Marsh) through a contract with the CA Department of Water Resources. The restoration is pursuant to requirements in the 2008/2009 and 2019 Biological Opinions for state and federal water project operations. Data on fish and invertebrate abundance on or near these sites was collected as baseline monitoring data and to determine the most efficient methods for monitoring wetlands. Understanding how invertebrate, fish, and phytoplankton communities change pre- to post-restoration is essential to evaluating the benefits of tidal wetlands to native fish species. Invertebrate data was collected using sweep nets, benthic cores, neuston nets, and zooplankton trawls. Fish data was collected using otter trawls, lampara nets, and beach seines. For each method, the team recorded the catch of fish, invertebrates, and other organisms, length of selected organisms, and a suite of environmental information, including: dissolved oxygen, water temperature, pH, specific conductance, turbidity, chlorophyll a, phycocyanin, and dissolved organic carbon. Additional water quality samples, processed for Chlorophyll a, Dissolved Ammonia, Dissolved Nitrite + Nitrate, Dissolved Organic Carbon, Dissolved Organic Nitrogen, Dissolved Ortho-phosphate, Pheophytin a, Total Kjeldahl Nitrogen, Total Organic Carbon, Total Phosphorus, and Total Suspended Solids, were collected at a subset of sampling sites. Data are collected before and after restoration at project and reference sites (Before-After-Control-Impact-design), as well as at adjacent water bodies.
Interagency Ecological Program San Francisco Estuary Spring Kodiak Trawl Survey 2002 - 2021
The Interagency Ecological Program San Francisco Estuary Spring Kodiak Trawl Survey was initiated by the California Department of Fish and Wildlife (CDFW) in 2002 to improve the detection rate of pre-spawning and mature Delta Smelt (hypomesus transpacificus). The survey began as the Spring Midwater Trawl Survey, an extension of the Fall Midwater Trawl Survey, in 1991 to assist with water management and export decisions in relation to the distribution of pre-spawning Delta Smelt. Net evaluations studies compared the relative catch efficiency of 3 types of nets and found that the Kodiak net was most effective for Sampling adult Delta Smelt. Objectives of SKT are to improve the ability to detect Delta Smelt, obtain maturity status for adult Delta Smelt, and provide results to scientist and managers on a near real-time basis to ais in resource management. SKT operates 6 monthly surveys December through May each lasting 4-5 days in length. Each survey, 40 fix sample locations are sampled using a standard 10 minute Kodiak trawl with a total length of 65 feet and a fully expanded mouth opening of 25 feet by 6 feet. The volume of water sampled is estimated using a General Oceanics flowmeter placed over the side of the boat. The net is constructed of green or black variable mesh ranging in dimension from 2 inches knoteted stretched mesh at the mouth and decreasing by ½ inch through a series of 5 panels to ¼ inch knotless stretched mesh at the cod-end. All fish sampled are identified to species and enumeration, Delta Smelt are staged in the field. At each station, environmental and water quality data are also collected, and include: temperature, electrical conductivity (normalized @ 25°C), water clarity, and tidal condition.
Interagency Ecological Program San Francisco Estuary 20-mm Survey 1995 - 2024
The Interagency Ecological Program San Francisco Estuary 20-mm Survey was initiated by the California Department of Fish and Wildlife (CDFW) in 1995 to monitor the distribution and abundance of post-larval and juvenile Delta Smelt (Hypomesus transpacificus). Delta Smelt are considered to be an annual fish endemic to the upper San Francisco Estuary that spawn in early spring and rear through the summer and fall in fresh to brackish water. Young of the Year (YOY) Delta Smelt are considered juveniles at sizes greater than or equal to 20-mm, and this survey targets those Delta Smelt. The 20-mm Survey currently samples 61 stations at fixed locations from San Pablo Bay through Suisun Bay and into the Sacramento-San Joaquin River Delta every other week from March to July. The survey has historically sampled between 41 and 55 stations. At each station, three 10-minute stepped oblique tows are conducted for fish. Each stepped oblique tow follows a tow schedule to sample the water column up to 32 ft, and the volume of water sampled is estimated using a General Oceanics flowmeter. The net is a cone shaped plankton net composed of 1600μm mesh and measuring 5.5 meters in length with a mouth area of 1.51m2 lashed onto a rigid D-frame with skis. Post-larval and juvenile fish samples are preserved in the field in 10% Formalin dyed with Rose Bengal and brought back to the CDFW Stockton Lab for identification to species and enumeration under a microscope. Fish are measured to fork length or total length when fork is not present. At each station, environmental and water quality data are also collected, and include: top temperature, top and bottom electrical conductivity (normalized at 25 degree C), secchi (cm), surface water clarity (FNU), and tidal condition.
Mechanisms mediating plant distributions across estuarine landscapes in a low-latitude tidal estuary
Understanding of how plant communities are organized and will respond to global changes requires an understanding of how plant species respond to multiple environmental gradients. We examined the mechanisms mediating the distribution patterns of tidal marsh plants along an estuarine gradient in Georgia using a combination of field transplant experiments and monitoring. Our results could not be fully explained by the “competition-to-stress hypothesis” (the current paradigm explaining plant distributions across estuarine landscapes). This hypothesis states that the upstream limits of plant distributions are determined by competition, and the downstream limits by abiotic stress. We found that competition was generally strong in freshwater and brackish marshes, and that conditions in brackish and salt marshes were stressful to freshwater marsh plants, results consistent with the competition-to-stress hypothesis. Four other aspects of our results, however, were not explained by the competition-to-stress hypothesis. First, several halophytes found the freshwater habitat stressful, and performed best (in the absence of competition) in brackish or salt marshes. Second, the upstream distribution of one species was determined by the combination of both abiotic and biotic (competition) factors. Third, marsh productivity (estimated by standing biomass) was a better predictor of relative biotic interaction intensity (RII) than was salinity or flooding, suggesting that productivity is a better indicator of plant stress than salinity or flooding gradients. Fourth, facilitation played a role in mediating the distribution patterns of some plants. Our results illustrate that even apparently simple abiotic gradients can encompass surprisingly complex processes mediating plant distributions.
Geographic coordinates, soil properties, plant species composition and vegetation survey data in the study on tidal marshes of the Ogeechee, Altamaha and Satilla estuaries in Georgia, USA
We examined patterns of habitat function (plant species richness), productivity (plant aboveground biomass and total C), and nutrient stocks (N and P in aboveground plant biomass and soil) in tidal marshes of the Satilla, Altamaha, and Ogeechee Estuaries in Georgia, USA. We worked at two sites within each salinity zone (fresh, brackish, and saline) in each estuary, sampling a transect from the creekbank to the marsh platform. Site-scale and plot-scale species richness decreased from fresh to saline sites. Standing crop biomass and total carbon stocks were greatest at brackish sites, followed by freshwater then saline sites.
2004 Estuarine Fish Sampling - Managing freshwater inflow to estuaries in northeast Puerto Rico
Historical data are often one of the only resources for documenting and assessing causes of environmental change, particularly in developing regions where funding for ecological studies is limited. In this study, previously unpublished data from a 1977 year-long study of the fish community of the Espiritu Santo estuary are presented. This dataset is among the oldest and most extensive surveys of a Caribbean island estuarine fish community. A comparison of these historical data with data collected in June and July 2004 using identical sampling methods allowed description of potential long-term changes in the fish community, identification of vulnerable species, and assessment of potential drivers of change. Results strongly suggest a decline in species richness and abundance in the Espiritu Santo estuarine fish community, with greater declines in freshwater-tolerant than marine or euryhaline species. Declines in freshwater inflow to the estuary, due to large-scale upstream water abstractions for municipal use, have increased since the initial 1977 survey. This is the first study to examine long-term change in the fish community of a tropical island estuary. Additional research and conservation efforts are needed to understand mechanisms of change and to protect Caribbean island estuarine fish communities. Chapter 2 (isotope and gut content data): The contribution of riverine-derived organisms and organic matter to four fishes along the salinity gradient in two Puerto Rican estuaries, the Espiritu Santo and Mameyes, was examined via stable isotope and gut content analyses. Stable isotope analyses indicated that riverine organic matter potentially contributed as much as 69% of the diet of one (caitipa mojarra, Diapterus rhombeus) of four fishes sampled. In contrast, riverine organic matter was of little direct importance to the three other fishes, tarpon snook (Centropomus pectinatus), ground croaker (Bairdiella ronchus), and white mullet (Mugil curema) contributing le
PIE LTER nutrient samples collected by Sigma Autosampler between 2001 and 2017 in three headwater sites of contrasting land use, and at the Parker and Ipswich River Dams as they enter into the Plum Island Sound estuary, Massachusetts.
Total organic nitrogen, total organic phosphorus, and nitrate concentrations collected frequently by Sigma autosampler (or volunteers in winter) from 5 sites. Sites include three headwater sites of contrasting land use (CC= Forest, SB = suburban, CS = wetland) and at the mouth of the Ipswich and Parker Rivers where they flow into the estuary.
PIE LTER, stable isotope chemistry (carbon, nitrogen and sulfur) for food web analysis of functional groups in the Plum Island Sound Estuary, Massachusetts.
Stable isotopes of primary producers will be compared to stable isotopes of functional groups of organisms at primarily three sites within the estuary that have different dominant sources of organic matter. The three sites are: Lower (IBYC, SO-3, mouth of Plum Island Sound, 2-3 km upstream of the mouth of the estuary), Middle (OTL, PR-10.1, upper Sound, lower Parker, 8-11 km upstream of the mouth of the estuary) and Upper (P2, PR-21.9, upper Parker, above Middle Rd Bridge (22 km upstream of the mouth of the estuary). The Lower site is dominated by marine phytoplankton, the Middle site is dominated by a mixture of salt marsh and phytoplankton and the Upper site is dominated by oligohaline phytoplankton and fresh marsh. Ten functional groups will be sampled at each site (Surface sediment, benthic diatoms, Nereis, mummichog, ribbed mussels, POM, blue mussels, pelagic copepods (Acartia), silversides and soft shell clams (Mya). Marsh, benthic algae and phytoplankton inputs or benthic vs. pelagic pathways will be evident in the isotopic signals of these functional groups. Samples will be collected between the middle and end of August to reflect a growing season using recently produced OM. Samples of 15 – 20 individuals will be pooled for analysis. Some silverside samplings will have 3 different pooled samples for determination of variance. Often times the same species are not collected at each site due to habitat differences (salinity/discharge) so additional species are collected to try to accomplish task of getting functional groups collected.
Plum Island LTER phytoplankton identification using HPLC and Chem Taxonomy along transects in the Plum Island Sound estuary, Massachusetts.
Water column samples are collected along an estuarine salinity gradient as part of our monitoring surveys of the Parker River estuary each spring and late summer (typically high vs low freshwater input). Samples are filtered, and stored frozen for later pigment analyses by HPLC. Pigment data are then analyzed by CHEMTAX, calibrated to a matrix of pigment ratios based on taxonomy and enumeration of selected subsamples by microspcopy. Data are presented in terms of chlorophyll a concentrations partitionaed among the major phytoplankton groups as determined by CHEMTAX. For 2003-2006, sampling stations along the Plum Island Sound-Parker River were at fixed geographic locations at specific "Bends" in the river. In 2008, we began sampling the water column in salinity space rather than at specific geographic locations along the river. This sampling approach was adopted in order to follow particular water masses in this macrotidal estuary. In practical terms, it means that sampling locations, or stations, are not static. Therefore, we have mapped the 11 sampling locations (latitude and longitude are logged at each station) from each transect along the mainstem of the estuary, so each station may be placed along the river (to the nearest 0.5km) as well as in salinity space. We have also used the km marker to assign the sampling locations from each survey to one of four bounding boxes : the Sound (Plum Island Sound; EST-PR-SoundBND) which encompasses approximatly the first 9.5 km or the transect, with Okm at the mouth of the sound; the Lower Parker River (EST-PR-LowerParkerBND) , ~9.5 - 14.5 km; the Middle Parker River (EST-PRMiddleParkerBND), ~14.5 - 18.75 km, and the Upper Parker River (EST-PR-UpperParker BND)., ~18.75 to 24.25 km (the Parker R. Dam).
PIE LTER zooplankton surveys using plankton tows along transects in the Plum Island Sound estuary, Massachusetts
Zooplankton were collected in spring and late summer/fall at four stations representing the salinity gradient in the Parker River-Plum Island Sound estuary. Two size classes, greater than 335 micron and greater than 150 micron, were collected by net tows. Conductivity or salinty and temperature were recorded for each sample. Samples were concentrated to less than 250 mls and preserved in 70 percent EtOH. For taxonomy, sample splits were taken such that a minimum of 250 individuals were present, and counted under a dissecting microscope. Individuals were identified to the lowest taxonomic level possible, generally to species. Adult copepods were additionally characterized by sex.
Year 2014, 15 minute interval, water quality measurements of water column temperature, salinity, oxygen, and depth in the upper Parker River Estuary near Middle Road Bridge, Newbury, MA.
Year 2014, water quality sonde data.15 minute readings of water column temperature, salinity, oxygen and depth in the upper Parker River Estuary near Middle Rd Bridge, Newbury, MA
Year 2015, 15 minute interval, water quality measurements of water column temperature, salinity, oxygen, and depth in the upper Parker River Estuary near Middle Road Bridge, Newbury, MA.
Year 2015, water quality sonde data.15 minute readings of water column temperature, salinity, oxygen and depth in the upper Parker River Estuary near Middle Rd Bridge, Newbury, MA
Year 2016, 15 minute interval, water quality measurements of water column temperature, salinity, oxygen, and depth in the upper Parker River Estuary near Middle Road Bridge, Newbury, MA.
Year 2016, water quality sonde data.15 minute readings of water column temperature, salinity, oxygen and depth in the upper Parker River Estuary near Middle Rd Bridge, Newbury, MA
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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