Stephen Walsh, Ph.D.
Stephen Walsh is a retired Research Fish Biologist with USGS-WARC in Gainesville, Florida.
Stephen's primary expertise is in the general fields of ichthyology and fish biology, with secondary expertise in aquatic ecology and ecophysiology. Most of his research has been focused in lotic and estuarine systems throughout the Southeast. Additionally, he has conducted research in the Neotropics, Africa, and Micronesia. His research interests include conservation biology and biodiversity of aquatic organisms; ecology and environmental physiology of fishes and aquatic invertebrates; evolution, systematics, and zoogeography of temperate and tropical freshwater, estuarine, and inshore marine fishes; reproductive biology and physiology of lower vertebrates; life-history strategies.
Education
Ph.D., University of Florida
M.A., Southern Illinois University
B.A., Saint Louis University
Professional Experience
1991-2021, U.S. Fish & Wildlife Service, U.S. Geological Survey
1986-1990, Florida Museum of Natural History
Affiliations
School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, University of Florida (Courtesy Assistant Professor, 2005-present); Florida Museum of Natural History (Courtesy Associate Curator in Ichthyology, 1992-present); Department of Biology, University of Florida (Courtesy Assistant Professor, 1996-present). Served on 13 graduate student committees (University of Florida; University of Southern Mississippi; Southern Illinois University, Valdosta State University).
Science and Products
Mekong River fish ecology information gap assessment and capacity building in Laos
Importance of floodplain connectivity to fish populations in the Apalachicola River, Florida
A bibliography of all known publications & reports on the Gulf sturgeon, Acipenser oxyrinchus desotoi
Discovery of South American suckermouth armored catfishes (Loricariidae, Pterygoplichthys spp.) in the Santa Fe River drainage, Suwannee River basin, USA
The native Florida Green Watersnak, Nerodia floridana (Goff 1936) , preying upon the nonindigenous African Jewelfish, Hemichromis letourneuxi Sauvage 1880, in Florida.
Evaluating the potential for stock size to limit recruitment in largemouth bass
Hydrology, Water Quality, and Aquatic Communities of Selected Springs in the St. Johns River Water Management District, Florida
Composition of Age-0 Fish Assemblages in the Apalachicola River, River Styx, and Battle Bend, Florida
The decline of North American freshwater fishes
Conservation status of imperiled north American freshwater and diadromous fishes
Aquatic Community, Hydrologic, and Water-Quality Data for Apopka, Bugg, Rock, and Wekiva Springs, Central Florida, 1931-2006
Alpine treeline of western North America: Linking organism-to-landscape dynamics
Science and Products
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Filter Total Items: 51
Mekong River fish ecology information gap assessment and capacity building in Laos
No abstract availableAuthorsStephen J. Walsh, Douglas C. Peterson, Kulthida A TechasarinImportance of floodplain connectivity to fish populations in the Apalachicola River, Florida
Floodplain habitats provide critical spawning and rearing habitats for many large-river fishes. The paradigm that floodplains are essential habitats is often a key reason for restoring altered rivers to natural flow regimes. However, few studies have documented spatial and temporal utilization of floodplain habitats by adult fish of sport or commercial management interest or assessed obligatory acAuthorsO.T. Burgess, William E. Pine, S. J. WalshA bibliography of all known publications & reports on the Gulf sturgeon, Acipenser oxyrinchus desotoi
This functional bibliography is meant to be a complete and comprehensive bibliography of all discoverable reports containing information on the Gulf Sturgeon (GS). This bibliography contains all known reports presenting, documenting, summarizing, listing, or interpreting information on the GS through 31 December 2013. Report citations are organized into four sections. Section I includes publishedAuthorsMelissa Price, Jennifer Adler, Chanda Littles, April Norem Randolph, Ursula A. Nash, Bethan Gillett, Michael T. Randall, Kenneth J. Sulak, Stephen J. Walsh, Prescott BrownellDiscovery of South American suckermouth armored catfishes (Loricariidae, Pterygoplichthys spp.) in the Santa Fe River drainage, Suwannee River basin, USA
We report on the occurrence of South American suckermouth armored catfishes (Loricariidae) in the Suwannee River basin, southeastern USA. Over the past few years (2009-2012), loricariid catfishes have been observed at various sites in the Santa Fe River drainage, a major tributary of the Suwannee in the state of Florida. Similar to other introduced populations of Pterygoplichthys, there is high liAuthorsLeo G. Nico, Peter L. Butt, Gerald R. Johnston, Howard L. Jelks, Matthew Kail, Stephen J. WalshThe native Florida Green Watersnak, Nerodia floridana (Goff 1936) , preying upon the nonindigenous African Jewelfish, Hemichromis letourneuxi Sauvage 1880, in Florida.
No abstract availableAuthorsKenneth L. Krysko, Stephen J. Walsh, Robert H. RobinsEvaluating the potential for stock size to limit recruitment in largemouth bass
Compensatory changes in juvenile survival allow fish stocks to maintain relatively constant recruitment across a wide range of stock sizes (and levels of fishing), but few studies have experimentally explored recruitment compensation in fish populations. We evaluated the potential for recruitment compensation in largemouth bass Micropterus salmoides by stocking six 0.4-ha hatchery ponds with adultAuthorsMichael S. Allen, Mark W. Rogers, Mathew J. Catalano, Daniel G. Gwinn, Stephen J. WalshHydrology, Water Quality, and Aquatic Communities of Selected Springs in the St. Johns River Water Management District, Florida
Hydrologic, physicochemical, and aquatic community data were collected and compiled by the U.S. Geological Survey for selected springs within the St. Johns River Water Management District from January 2004 to October 2007. Nine springs were included in this study: Alexander, Apopka, Bugg, De Leon, Gemini, Green, Rock, Silver Glen, and Wekiwa. Urban lands increased in Alexander, Apopka, De Leon, GeAuthorsStephen J. Walsh, Leel Knowles, Brian G. Katz, Douglas G. StromComposition of Age-0 Fish Assemblages in the Apalachicola River, River Styx, and Battle Bend, Florida
Light traps were used to sample the age-0 year class of fish communities in the Apalachicola River and associated floodplain water bodies of River Styx and Battle Bend, Florida, in 2006-2007. A total of 629 light traps were deployed during the spring and early summer months (341 between March 15 and June 6, 2006; 288 between March 9 and July 3, 2007). For combined years, 13.8 percent of traps wereAuthorsStephen J. Walsh, Elissa N. Buttermore, O. Towns Burgess, William E. PineThe decline of North American freshwater fishes
North America has a broad array of freshwater ecosystems because of the continent's complex geography and geological history. Within a multitude of habitats—that include streams, large rivers, natural lakes, springs, and wetlands—rich assemblages of fishes reside, representing diverse taxonomic groups with unique ecological requirements. They face an unprecedented conservation crisis.1 In the lastAuthorsStephen J. Walsh, Howard L. Jelks, Noel M. BurkheadConservation status of imperiled north American freshwater and diadromous fishes
This is the third compilation of imperiled (i.e., endangered, threatened, vulnerable) plus extinct freshwater and diadromous fishes of North America prepared by the American Fisheries Society's Endangered Species Committee. Since the last revision in 1989, imperilment of inland fishes has increased substantially. This list includes 700 extant taxa representing 133 genera and 36 families, a 92% incAuthorsH.L. Jelks, S. J. Walsh, N.M. Burkhead, Salvador Contreras-Balderas, E. Diaz-Pardo, D.A. Hendrickson, J. Lyons, N.E. Mandrak, F. McCormick, Joseph S. Nelson, Steven P. Platania, B.A. Porter, C.B. Renaud, J. J. Schmitter-Soto, E.B. Taylor, M.L. WarrenAquatic Community, Hydrologic, and Water-Quality Data for Apopka, Bugg, Rock, and Wekiva Springs, Central Florida, 1931-2006
This report summarizes aquatic community, hydrologic, and water-quality data collected or compiled by the U.S. Geological Survey (USGS) for Apopka, Bugg, Rock, and Wekiva springs from October 1, 2005 to September 30, 2006. Aquatic community data are summarized for quarterly collections of benthic macroinvertebrates, and fishes collected during one sampling event per spring. Hydrologic data for eacAuthorsStephen J. Walsh, Sharon E. KroeningAlpine treeline of western North America: Linking organism-to-landscape dynamics
Although the ecological dynamics of the alpine treeline ecotone are influenced by climate, it is an imperfect indicator of climate change. Mechanistic processes that shape the ecotone—seed rain, seed germination, seedling establishment and subsequent tree growth form, or, conversely tree dieback—depend on microsite patterns. Growth forms affect wind and snow, and so develop positive and negative fAuthorsGeorge P. Malanson, David R. Butler, Daniel B. Fagre, Stephen J Walsh, Diana F. Tomback, Lori D. Daniels, Lynn M. Resler, William K. Smith, Daniel J. Weiss, David L. Peterson, Andrew G. Bunn, Christopher A. Hiemstra, Daniel Liptzin, Patrick S. Bourgeron, Zehao Shen, Constance I. Millar - Science
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