Realm: Freshwater
Climate: Temperate
Biome: Small river ecosystems
Central latitude: 38.180350
Central longitude: -121.820100
Duration: 5 years, from 2017 to 2021

10081 records

16 distinct species

Across the time series Hyperacanthomysis longirostris is the most frequently occurring species

Methods

Curators note: The original IEP zooplankton dataset has been split by the different survey programmes due to methodological differences. The Interagency Ecological Program (IEP) is a consortium of State and federal agencies that has been conducting cooperative ecological investigations since the 1970s. The IEP runs over twenty long-term monitoring surveys on biological components of the Upper San Francisco Estuary. Surveys monitor phytoplankton, zooplankton, benthic invertebrates, water quality, and many types of fish. Several fish surveys sample zooplankton concurrently, and information on zooplankton species composition and abundance can be coupled with fish diet studies. The IEP long-term surveys that monitor zooplankton are the Environmental Monitoring Program (EMP; also known as the IEP zooplankton study), 20-mm Survey (20mm), Fall Midwater Trawl (FMWT), Summer Townet Survey (STN), the Yolo Bypass Fisheries Monitoring Survey (not included in this integrated dataset), and the Fish Restoration Program (FRP). An overview of these programs is provided in study_metadata.csv. Locations of fixed sampling locations for surveys with fixed sampling designs are provided in stations.csv, and coordinates for every sample are provided in environment.csv. Zooplankton surveys sample 3 different size classes of zooplankton, by towing nets with different sized mesh (or in one case a pump that pumps water into a microzooplankton net). Every IEP survey that collects zooplankton samples with a mesozooplankton net, which targets adult copepods and cladocerans, because these taxa are believed to comprise the majority of zooplankton in juvenile and adult planktivorous fish diets. Some surveys also sample with micro- or macro-zooplankton nets. Three size classes of zooplankton are targeted by these sampling programs with different net mesh sizes: micro zooplankton (copepods and rotifers) are targeted with a 43 µm mesh net, meso zooplankton (copepods and cladocerans) are targeted with 150 - 160 µm mesh nets, and macro zooplankton (mysids and amphipods) are targeted with 500-505 µm mesh nets. DOP The Directed Outflow Project was initiated by the United States Bureau of Reclamation in 2017 to evaluate the effectiveness of fall outflow actions on Delta Smelt. Field sampling is paired with the United States Fish and Wildlife Service Enhanced Delta Smelt Monitoring. Three random sites are chosen per region (Suisun Bay, Suisun Marsh, the Lower Sacramento River, the Cache Slough Complex, and the Sacramento Deep Water Ship Channel) and time period using a Generalized Random Tessellation Stratified design. Samples were collected once every two weeks in 2017 and weekly thereafter. Sampling is conducted in the fall and, starting in 2019, spring and summer seasons have also been sampled. In 2017, stations were sampled in 3 additional regions: West of the Benicia Bridge, Lower San Joaquin, and Upper Sac River. At each station, sample collection is attempted at both shoal (less than or equal to 10 feet deep) and channel (greater than 10 feet deep) habitat. Channels are sampled at the surface (0.5 m deep) and, if deeper than 20 feet, also at the bottom 1/2 to 1/3 of the water column. In 2017, oblique tows were also conducted to compare with the horizontal tows. DOP samples with meso (150 ?m) and macro (500 ?m) zooplankton nets that are each 2 m in length. In 2017, both nets were 50 cm in diameter but starting in 2018 a smaller 20 cm diameter net was used for the mesozooplankton samples. Samples are stored in 10% formalin.

Citation(s)

@Dataset{BioTIME_cit332, Study_id = {556}, Citation_id = {332}, Author = {Bashevkin, S.M. and Hartman, R. and Thomas, M. and Barros, A. and Burdi, C.E. and Hennessy, A. and Tempel, T. and Kayfetz, K. and Alstad, K. and Pien, C.}, Publisher = {Environmental Data Initiative}, Title = {Interagency Ecological Program: Zooplankton abundance in the Upper San Francisco Estuary from 1972-2021, an integration of 7 long-term monitoring programs ver 4}, Year = {2023}, Doi = {10.6073/pasta/8b646dfbeb625e308212a39f1e46f69b}, Url = {https://doi.org/10.6073/pasta/8b646dfbeb625e308212a39f1e46f69b}, Language = {English}, Version = {4} }