Science Keywords>HUMAN DIMENSIONS>HABITAT CONVERSION/FRAGMENTATION>RECLAMATION/REVEGETATION/RESTORATION
Empirical studies in Support of Florida Bay and Adjacent Marine Ecosystems RestorationEntry ID: USGS_SOFIA_robblee_fb_shrimp_04
Abstract: The objectives of these activities are broadly: 1) to develop and implement (with other agency members) a program of research to support the restoration of Florida Bay; 2) with other PDT members to develop and evaluate restoration alternatives for Florida Bay and 3) with other committee members to develop performance measures and assess restoration alternatives affecting Florida Bay, Biscayne Bay, ... Barnes Sound and Manatee Bay and the lower southwest coast mangrove estuaries.
Florida Bay lies downstream of the Everglades ecosystem. Perceived deterioration of the Everglades over the last century - and Florida Bay since the mid-1980s - is generally viewed as linked to changes in freshwater flow and water quality associated with water management in South Florida. The pink shrimp is a species of special interest in each of the above studies because it has been chosen as an indicator species for use in restoration of south Florida estuaries. Empirical and experimental data developed in these studies will be used to support the development of a pink shrimp landscape simulation model and restoration performance measures.
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Data Set Citation
Dataset Originator/Creator: Michael B. Robblee Clinton Hittle; Joan Browder; Maria Criales; John Wang
Dataset Title: Empirical studies in Support of Florida Bay and Adjacent Marine Ecosystems Restoration
Dataset Release Date: UnknownOnline Resource: http://sofia.usgs.gov/projects/index.php?project_url=emp_flbay/
Start Date: 2002-10-01Stop Date: 2003-09-30
BIOSPHERE > TERRESTRIAL ECOSYSTEMS > WETLANDS
HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > RECLAMATION/REVEGETATION/RESTORATION
OCEANS > COASTAL PROCESSES > MANGROVES
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS > DECAPODS
BIOSPHERE > AQUATIC ECOSYSTEMS > ESTUARINE HABITAT
BIOSPHERE > AQUATIC ECOSYSTEMS > WETLANDS
Quality LOGICAL CONSISTENCY REPORT: not applicable
COMPLETENESS REPORT: not available
Critical long-term databases exist for pink shrimp that are suitable for developing empirical relationships and baselines. NOAA has collected and maintained catch and effort data on this fishery since 1960. The National Park ... Service and USGS have monitored juvenile shrimp abundance in relation to physical conditions of salinity and temperature and seagrass habitat, principally in western Florida Bay, since 1981.
Analysis of this data set will provide the pink shrimp simulation model with seasonal timing, size frequency data as well as abundance and size of juvenile pink shrimp in relation to bank, basin and near-key habitats seagrass cover. Specific objectives include:
1. Quantify density and size of juvenile pink shrimp in relation to bank, basin and near-key habitat in Johnson Key Basin, western Florida Bay.
2. Implement Braun Blanquet cover estimation as a means of associating pink shrimp abundance to seagrass and algal habitat.
3. Evaluate the existing benthic database in order to develop a monitoring protocol for assessing juvenile pink shrimp abundance and distribution in Florida Bay in relation to changes in salinity.
Using established methods nine stations (3 bank, 3 basin, 3 near-key habitat) in Johnson Key Basin will be sampled on a six-week interval for a total of 9 collections during FY2003. A one meter square throw-trap is used to quantitatively collect seagrass associated fish and invertebrates including the pink shrimp. Each throw-trap is swept three times to remove organisms. Four throw-trap samples are collected at each station as well as a suite of environmental and habitat variables. Previously habitat estimates have been made based on biomass estimates of seagrass and algae associated with throw-trap collections. Braun Blanquet is a categorical cover estimate technique currently used in seagrass monitoring programs in Florida Bay and the Florida Keys. In the laboratory samples will be sorted, all fish and shrimp (caridean and pink shrimp) will be identified to species and enumerated. Data will be stored in the Everglades National Park Oracle Database.
The timing, distribution and magnitude of postlarval shrimp immigration to Florida Bay were identified as critical information needs required for development of the pink shrimp simulation model. To address these needs a field study is ongoing to estimate and compare monthly postlarval immigration to Florida Bay through six defined channels: two from the Gulf of Mexico (Sandy Key, Middle Ground) into western Florida Bay, two from the Atlantic Ocean (Whale Harbor Channel, Indian Key Channel) through the Florida Keys into southwestern and central Florida Bay, and two interior channels that connect Florida Bay sub basins, Conchie Channel near Flamingo in western Florida Bay and Panhandle Key Cut in south central Florida Bay. Sampling postlarval pink shrimp at these six stations involves the closely coordinated efforts of NOAA, responsible for sampling the Florida Keys stations, and UM and USGS personnel with responsibility for sampling the western Florida Bay stations. Specific objectives include:
1. Quantify the seasonality and magnitude of postlarval pink shrimp immigration to Florida Bay.
2. Compare timing and magnitude of postlarval pink shrimp immigration from the Gulf of Mexico and the Atlantic Ocean.
3. Assess accessibility of inner Florida Bay to postlarval pink shrimp by comparing the timing and magnitude of Gulf of Mexico stations to Conchie Channel; of Atlantic Ocean stations to Panhandle Key Cut.
4. Assess sampling protocols by comparing postlarvae catch in relation to tidal phase and depth.
5. Participate in the development of a transport module for the pink shrimp simulation model.
Post larval pink shrimp sampling was initiated in January 2000. Channel nets (0.75 m2 opening, 1-mm mesh net, 500-micron mesh in the cod end) are used. The nets are attached to fixed moorings in the evening and samples are collected the following morning having passively collected postlarvae over night. The top of the channel net is set at .5 meter deep. At present paired channel nets sample six channels on two nights of the new moon; thus, four samples are obtained from each site each month for a total of 24. Pink shrimp postlarvae are sorted from the sample, identified, and preserved in 95% ethanol. The raw catch in each sample is standardized to density per 1,000 m3 of water filtered. Mean monthly density is calculated as the average over the two sampling nights. Densities are tested for normality and homogeneity of variance. Two experiments will be conducted to evaluate the current sampling methods. The present method of drifting the channel nets over night will be evaluated by sampling on a two-hour interval with the object of understanding when post larvae are most abundant. A second experiment will evaluate the relationship of depth and postlarval pink shrimp abundance by comparing catch in nets drifted at the surface, .5 meter and 1 meter. Experimental results will be used to aid in interpretation of catches or alternatively to modify sampling protocols.
In October of 2001, a study began to determine the volume transport at each of the six stations where postlarvae are being sampled. Acoustic Doppler technology has been installed at the four defined channels connecting Florida Bay with the Gulf of Mexico (Sandy, Middle Ground) and the Atlantic Ocean (Whale Harbor, Indian Key) and the two interior channels Conchie, Panhandle) that connect to Florida Bay interior sub basins where monthly postlarval sampling occurs. These estimates of volume transport facilitate the direct comparison of the six stations being sampled for postlarvae and are essential to an assessment of the relative importance of the two known pathways of larval immigration into Florida Bay - west from the Gulf of Mexico and from the Atlantic Ocean through passages in the Florida Keys. These continuous measurements are also essential in developing a larval transport module for the pink shrimp simulation model. A significant additional benefit of the data being collected is that it will be very useful in the development of a Florida Bay circulation model, a high priority of CERP. Specific objectives include:
1. Estimate volume transport in the six channels being sampled for postlarvae.
2. Construct rating curves at each station under a variety of tidal flow conditions in order to improve volume transport estimates.
3. Compare volume transport among the six stations in a comparison of postlarval immigration into Florida Bay.
4. Participate in the development of a transport module for the pink shrimp simulation model.
Measurements of flow, stage, and salinity will continue in FY 2003 in the six channels being sampled for post larvae. In collaboration with Dr. Joan Browder of NOAA these data will be applied to the construction of the larval transport module for the pink shrimp simulation module. Methods developed to date and in other studies will continue to be employed. Acoustic Doppler Velocity Meters (ADVM) have been installed at the instrumented sites and are used to measure continuous (15- minute) water velocity. A boat-mounted Acoustic Doppler Current Profiler (ADCP) is used to calculate total discharge along a transect of the channels during inspections. The ADCP also measures water depth, boat speed, and direction of boat movement using acoustic reflections from the streambed. Discharge and flow direction are both calculated from data collected with the ADCP. The mean velocity for the creek section is calculated by dividing the total discharge measured with the ADCP by the cross-sectional area corresponding to the water level at the time of the discharge measurement. The cross-sectional area is computed by using site-specific stage-area ratings. A velocity rating between the mean ADCP velocity and the in situ ADVM velocity is calculated by regression analysis. This rating equation is then used to calculate continous discharge using the velocity data. Stage measurements are made acoustically and through water pressure in the ADVM and Salinity instrumentation respectively. Stage is used to define the cross-sectional area over which flow measurements are made, and are used in the regression analysis between flow and stage. Salinity measured near the surface and bottom of each channel to quantify the vertical stratification present at each site, which could be detrimental to acoustic signals. Additionally, temperature is measured to monitor possible vertical temperature gradients that could be detrimental to acoustic signals and as a necessary parameter to calculate salinity from conductivity.
Work planned for FY 2004
1. The CESI sponsored long-term study entitled 'Temporal and spatial variation in seagrass associated fish and invertebrates in Johnson Key Basin, western Florida Bay, with emphasis on the pink shrimp, Farfantepenaeus duorarum' will document long-term responses of the seagrass associated shrimp and fish community in Johnson Key Basin to environmental conditions (e.g. salinity) and changes in seagrass habitat
2. with Joan Browder the SFWMD sponsored study entitled 'Biscayne Bay Coastal and Nearshore Community Baseline Study to Develop Biological Performance Measures' will develop performance measures relating the fish and crustacean communities of southern Biscayne Bay to salinity and habitat
3 with Joan Browder, Maria Criales and Clinton Hittle the NOAA sponsored study entitled 'Immigration pathways of pink shrimp postlarvae into and within Florida Bay' will evaluate postlarval immigration (seasonal timing and abundance) to and into Florida Bay in relation to environmental conditions and habitat. The pink shrimp is a species of special interest in each of the above studies because it has been chosen as an indicator species for use in restoration of south Florida estuaries. Empirical and experimental data developed in these studies will be used to support the development of a pink shrimp landscape simulation model and restoration performance measures.
PROCESS DATE: Unknown
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Access Constraints ACCESS CONSTRAINTS: none
DISTRIBUTION LIABILITY: The USGS assumes no responsibility for the use of the data
Use Constraints Any data from this project are subject to change and are not citeable until reviewed and approved for official publication.
Data Set Progress
Role: TECHNICAL CONTACT
Phone: (305) 348-1269
Fax: (305) 348-4096
Email: mike_robblee at usgs.gov
U.S. Geological Survey FIU, University Park Campus OE Building, Room 148
Province or State: FL
Postal Code: 33199
Role: DIF AUTHOR
Email: alicia.m.aleman at nasa.gov
Goddard Space Flight Center Code 610.2
Province or State: MD
Postal Code: 20771
Fourqurean, J. W., Robblee, M. B., 1999, Florida Bay: a history of recent ecological changes, Estuaries, v. 22, n.2B, New York, Springer New York.
Browder, J. A., 1985, Relationship between pink shrimp production on the Tortugas and water flow patterns in the Florida Everglades, Bulletin of Marine Science, 37, Coral Gables, FL, University of Florida Press.
Browder, J. A., Restrepo, V. R.; Rice, J. K.; Robblee, M. B.; Zein-Eldin, A., 1999, Environmental influences on potential recruitment of pink shrimp, Farfantepenaeus duoraram, from Florida Bay nursery grounds,
Estuaries, v. 22, n. 2B, New York, New York, Springer New York.
Browder, J. A., Moore, D., 1981, A new approach to determining the quantative relationship between fishery production and the flow of fresh water to estuaries, Proceedings, National Symposium on Freshwater Inflow to Estuaries, Vol. 1, FWS/OBS-81/04, Washington, DC, U.S. Fish and Wildlife Service, R. Cross and D. Williams, editors.
Browder, J. A., 1991, Watershed management and the importance of freshwater flow to estuaries, Proceedings, Tampa Bay Area Scientific Information Symposium, Tampa, FL, unknown, S. F. Treat and P. A. Clark, editors.
Creation and Review Dates
DIF Creation Date: 2008-11-03
Last DIF Revision Date: 2009-02-18