Larry Brown (Former Employee)
Science and Products
Filter Total Items: 121
Can diet-dependent factors help explain fish-to-fish variation in thiamine-dependent early mortality syndrome?
To provide insight into the reasons why offspring of certain salmonine females exhibit early mortality syndrome (EMS) in the Great Lakes whereas others do not, we measured the egg concentrations of potential biochemical markers (stable isotopes of nitrogen and carbon, fatty acid signatures, and lipid-soluble carotenoids and vitamins) that are indicative of differing food web and trophic structure.
Authors
S.B. Brown, M.T. Arts, L. R. Brown, M. Brown, K. Moore, M. Villella, J.D. Fitzsimons, D. C. Honeyfield, D. E. Tillitt, J.L. Zajicek, M. Wolgamood, J.G. Hnath
Thiamine content and thiaminase activity of ten freshwater stocks and one marine stock of alewives
Alewives Alosa pseudoharengus contain thiaminase activity that has been implicated in the development of a thiamine deficiency and associated effects in salmonines of the Great Lakes basin. Little is known about the factors that regulate thiaminase activity in alewives. We sampled alewives of uniform size (60-120 mm) during the summer of 1998 from the Gulf of St. Lawrence, seven of New York's Fing
Authors
J.D. Fitzsimons, B. Williston, J.L. Zajicek, D. E. Tillitt, S.B. Brown, L. R. Brown, D. C. Honeyfield, D.M. Warner, L. G. Rudstam, W. Pearsall
Effectiveness of egg immersion in aqueous solutions of thiamine and thiamine analogs for reducing early mortality syndrome
Protocols used for therapeutic thiamine treatments in salmonine early mortality syndrome (EMS) were investigated in lake trout Salvelinus namaycush and coho salmon Oncorhynchus kisutch to assess their efficacy. At least 500 mg of thiamine HCl/L added to egg baths was required to produce a sustained elevation of thiamine content in lake trout eggs. Thiamine uptake from egg baths was not influenced
Authors
S.B. Brown, L. R. Brown, M. Brown, K. Moore, M. Villella, J.D. Fitzsimons, B. Williston, D. C. Honeyfield, J. P. Hinterkopf, D. E. Tillitt, J.L. Zajicek, M. Wolgamood
Thiamine and thiaminase status in forage fish of salmonines from Lake Michigan
Dietary sources of thiamine (vitamin B1) and thiamine-degrading enzymes (thiaminases) are thought to be primary factors in the development of thiamine deficiency among Great Lakes salmonines. We surveyed major forage fish species in Lake Michigan for their content of thiamine, thiamine vitamers, and thiaminase activity. Concentrations of total thiamine were similar (P ≤ 0.05) among most forage fis
Authors
D. E. Tillitt, J.L. Zajicek, S.B. Brown, L. R. Brown, J.D. Fitzsimons, D. C. Honeyfield, M.E. Holey, G.M. Wright
Effect of sample handling on thiamine and thiaminolytic activity in alewife
Alewives Alosa pseudoharengus were collected to evaluate handling and processing conditions that may affect the measurement of their thiamine-thiaminase content. Fish were captured by otter trawl, and reference samples of live fish were quick-frozen on dry ice immediately following capture. Other samples were placed on wet ice (4??C) or held in ambient lake water (21.5??C) for periods of up to 5 h
Authors
G.M. Wright, S.B. Brown, L. R. Brown, K. Moore, M. Villella, J.L. Zajicek, D. E. Tillitt, J.D. Fitzsimons, D. C. Honeyfield
Risk factors and declines in northern cricket frogs (Acris crepitans)
No abstract available.
Authors
V.R. Beasley, S. Faeh, B. Wikoff, C. Staehle, J. Eisold, D. Nichols, Rebecca A. Cole, A. Schotthoefer, M. Greenwell, L. Brown
Urbanization effects on fishes and habitat quality in a southern Piedmont river basin
We quantified the relationships among urban land cover, fishes, and habitat quality to determine how fish assemblages respond to urbanization and if a habitat index can be used as an indirect measure of urban effects on stream ecosystems. We sampled 30 wadeable streams along an urban gradient (5?37% urban land cover) in the Etowah River basin, Georgia. Fish assemblages, sampled by electrofishing
Authors
D.M. Walters, Mary C. Freeman, D.S. Leigh, B. J. Freeman, C.P. Pringle
Invaders eating invaders: Exploitation of novel alien prey by the alien shimofuri goby in the San Francisco Estuary, California
The shimofuri goby (Tridentiger bifasciatus), which is native to Asian estuaries, was recently introduced to the San Francisco Estuary, California, USA. We conducted gut content analyses to examine the goby's feeding ecology in this highly invaded estuary. Shimofuri gobies were generalist predators on benthic invertebrates, consuming seasonally abundant prey, especially amphipods (Corophium spp.).
Authors
S.A. Matern, L. R. Brown
Aquatic assemblages of the highly urbanized Santa Ana River Basin, California
We assessed the structure of periphyton, benthic macroinvertebrate, and fish assemblages and their associations with environmental variables at 17 sites on streams of the highly urbanized Santa Ana River basin in Southern California. All assemblages exhibited strong differences between highly urbanized sites in the valley and the least-impacted sites at the transition between the valley and undeve
Authors
Larry R. Brown, Carmen A. Burton, Kenneth Belitz
Assessing water source and channel type as factors affecting benthic macroinvertebrate and periphyton assemblages in the highly urbanized Santa Ana River Basin, California
The Santa Ana River basin is the largest stream system in Southern California and includes a densely populated coastal area. Extensive urbanization has altered the geomorphology and hydrology of the streams, adversely affecting aquatic communities. We studied macroinvertebrate and periphyton assemblages in relation to two categorical features of the highly engineered hydrologic system-water source
Authors
Carmen A. Burton, Larry R. Brown, Kenneth Belitz
Occurrence, Distribution, Instantaneous Loads, and Yields of Dissolved Pesticides in the San Joaquin River Basin, California, During Summer Conditions, 1994 and 2001
Water samples were collected from 22 drainage basins for analysis of 48 dissolved pesticides during summer flow conditions in 1994 and 2001. Of the 48 pesticides, 31 were reported applied in the basin in the 28 days preceding the June 1994 sampling, 25 in the 28 days preceding the June 2001 sampling, and 24 in the 28 days preceding the August 2001 sampling. The number of dissolved pesticides detec
Authors
Larry R. Brown, Sandra Y. Panshin, Charles R. Kratzer, Celia Zamora, JoAnn M. Gronberg
Periphyton and Macroinvertebrate Communities at Five Sites in the San Joaquin River Basin, California, during June and September, 2001
The effects of agriculture, particularly from the use of pesticides, on aquatic ecosystems in the San Joaquin River Basin concern many aquatic resource managers, water quality managers, and water users. A total of five sites were sampled once in June 2001 and once in September 2001 to document the periphyton (attached algae) community, the benthic macroinvertebrate (insects and non-insects) commun
Authors
Larry R. Brown, Jason T. May
Science and Products
Filter Total Items: 121
Can diet-dependent factors help explain fish-to-fish variation in thiamine-dependent early mortality syndrome?
To provide insight into the reasons why offspring of certain salmonine females exhibit early mortality syndrome (EMS) in the Great Lakes whereas others do not, we measured the egg concentrations of potential biochemical markers (stable isotopes of nitrogen and carbon, fatty acid signatures, and lipid-soluble carotenoids and vitamins) that are indicative of differing food web and trophic structure.
Authors
S.B. Brown, M.T. Arts, L. R. Brown, M. Brown, K. Moore, M. Villella, J.D. Fitzsimons, D. C. Honeyfield, D. E. Tillitt, J.L. Zajicek, M. Wolgamood, J.G. Hnath
Thiamine content and thiaminase activity of ten freshwater stocks and one marine stock of alewives
Alewives Alosa pseudoharengus contain thiaminase activity that has been implicated in the development of a thiamine deficiency and associated effects in salmonines of the Great Lakes basin. Little is known about the factors that regulate thiaminase activity in alewives. We sampled alewives of uniform size (60-120 mm) during the summer of 1998 from the Gulf of St. Lawrence, seven of New York's Fing
Authors
J.D. Fitzsimons, B. Williston, J.L. Zajicek, D. E. Tillitt, S.B. Brown, L. R. Brown, D. C. Honeyfield, D.M. Warner, L. G. Rudstam, W. Pearsall
Effectiveness of egg immersion in aqueous solutions of thiamine and thiamine analogs for reducing early mortality syndrome
Protocols used for therapeutic thiamine treatments in salmonine early mortality syndrome (EMS) were investigated in lake trout Salvelinus namaycush and coho salmon Oncorhynchus kisutch to assess their efficacy. At least 500 mg of thiamine HCl/L added to egg baths was required to produce a sustained elevation of thiamine content in lake trout eggs. Thiamine uptake from egg baths was not influenced
Authors
S.B. Brown, L. R. Brown, M. Brown, K. Moore, M. Villella, J.D. Fitzsimons, B. Williston, D. C. Honeyfield, J. P. Hinterkopf, D. E. Tillitt, J.L. Zajicek, M. Wolgamood
Thiamine and thiaminase status in forage fish of salmonines from Lake Michigan
Dietary sources of thiamine (vitamin B1) and thiamine-degrading enzymes (thiaminases) are thought to be primary factors in the development of thiamine deficiency among Great Lakes salmonines. We surveyed major forage fish species in Lake Michigan for their content of thiamine, thiamine vitamers, and thiaminase activity. Concentrations of total thiamine were similar (P ≤ 0.05) among most forage fis
Authors
D. E. Tillitt, J.L. Zajicek, S.B. Brown, L. R. Brown, J.D. Fitzsimons, D. C. Honeyfield, M.E. Holey, G.M. Wright
Effect of sample handling on thiamine and thiaminolytic activity in alewife
Alewives Alosa pseudoharengus were collected to evaluate handling and processing conditions that may affect the measurement of their thiamine-thiaminase content. Fish were captured by otter trawl, and reference samples of live fish were quick-frozen on dry ice immediately following capture. Other samples were placed on wet ice (4??C) or held in ambient lake water (21.5??C) for periods of up to 5 h
Authors
G.M. Wright, S.B. Brown, L. R. Brown, K. Moore, M. Villella, J.L. Zajicek, D. E. Tillitt, J.D. Fitzsimons, D. C. Honeyfield
Risk factors and declines in northern cricket frogs (Acris crepitans)
No abstract available.
Authors
V.R. Beasley, S. Faeh, B. Wikoff, C. Staehle, J. Eisold, D. Nichols, Rebecca A. Cole, A. Schotthoefer, M. Greenwell, L. Brown
Urbanization effects on fishes and habitat quality in a southern Piedmont river basin
We quantified the relationships among urban land cover, fishes, and habitat quality to determine how fish assemblages respond to urbanization and if a habitat index can be used as an indirect measure of urban effects on stream ecosystems. We sampled 30 wadeable streams along an urban gradient (5?37% urban land cover) in the Etowah River basin, Georgia. Fish assemblages, sampled by electrofishing
Authors
D.M. Walters, Mary C. Freeman, D.S. Leigh, B. J. Freeman, C.P. Pringle
Invaders eating invaders: Exploitation of novel alien prey by the alien shimofuri goby in the San Francisco Estuary, California
The shimofuri goby (Tridentiger bifasciatus), which is native to Asian estuaries, was recently introduced to the San Francisco Estuary, California, USA. We conducted gut content analyses to examine the goby's feeding ecology in this highly invaded estuary. Shimofuri gobies were generalist predators on benthic invertebrates, consuming seasonally abundant prey, especially amphipods (Corophium spp.).
Authors
S.A. Matern, L. R. Brown
Aquatic assemblages of the highly urbanized Santa Ana River Basin, California
We assessed the structure of periphyton, benthic macroinvertebrate, and fish assemblages and their associations with environmental variables at 17 sites on streams of the highly urbanized Santa Ana River basin in Southern California. All assemblages exhibited strong differences between highly urbanized sites in the valley and the least-impacted sites at the transition between the valley and undeve
Authors
Larry R. Brown, Carmen A. Burton, Kenneth Belitz
Assessing water source and channel type as factors affecting benthic macroinvertebrate and periphyton assemblages in the highly urbanized Santa Ana River Basin, California
The Santa Ana River basin is the largest stream system in Southern California and includes a densely populated coastal area. Extensive urbanization has altered the geomorphology and hydrology of the streams, adversely affecting aquatic communities. We studied macroinvertebrate and periphyton assemblages in relation to two categorical features of the highly engineered hydrologic system-water source
Authors
Carmen A. Burton, Larry R. Brown, Kenneth Belitz
Occurrence, Distribution, Instantaneous Loads, and Yields of Dissolved Pesticides in the San Joaquin River Basin, California, During Summer Conditions, 1994 and 2001
Water samples were collected from 22 drainage basins for analysis of 48 dissolved pesticides during summer flow conditions in 1994 and 2001. Of the 48 pesticides, 31 were reported applied in the basin in the 28 days preceding the June 1994 sampling, 25 in the 28 days preceding the June 2001 sampling, and 24 in the 28 days preceding the August 2001 sampling. The number of dissolved pesticides detec
Authors
Larry R. Brown, Sandra Y. Panshin, Charles R. Kratzer, Celia Zamora, JoAnn M. Gronberg
Periphyton and Macroinvertebrate Communities at Five Sites in the San Joaquin River Basin, California, during June and September, 2001
The effects of agriculture, particularly from the use of pesticides, on aquatic ecosystems in the San Joaquin River Basin concern many aquatic resource managers, water quality managers, and water users. A total of five sites were sampled once in June 2001 and once in September 2001 to document the periphyton (attached algae) community, the benthic macroinvertebrate (insects and non-insects) commun
Authors
Larry R. Brown, Jason T. May
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government