I'm a Research Fish Biologist with the U.S. Geological Survey's California Water Science Center in Sacramento, California. My research program is broadly focused on applied aquatic ecology with an emphasis on fishes. In general, my work aims to fill critical data gaps needed by fisheries and water resource managers to implement effective restoration and conservation measures for imperiled species and ecosystems. In particular, my work has focused on how aquatic ecosystems function at varying spatio-temporal scales and how this influences species-habitat relationships. Recent and active study topics span the range of life history studies of threatened and endangered species to the role of climate variability and climate change on species and communities.
Feyrer, F., L.R. Brown, R.L. Brown, and J.J. Orsi, editors. 2004. Early Life History of Fishes in the San Francisco Estuary and Watershed. American Fisheries Society, Symposium 39 Bethesda, Maryland.
Young, M., Feyrer, F., DeCarion, D., Conrad, L., and Sih, A, 2018, Anticipating the ecological outcome of habitat restoration: fish-habitat relationships along the estuarine gradient of the Sacramento-San Joaquin Delta, California. In review
Grimaldo, L., Feyrer, F., Burns, J., Maniscalco, D, 2017, Sampling uncharted waters: examining rearing habitat of larval longfin Smelt (Spirinchus thaleichthys) in the Upper San Francisco Estuary: Estuaries and Coasts. DOI 10.1007/s12237-017-0255-9
Zeug, S., Feyrer, F., Brodsky, A., and Melgo, J., 2017, Piscivore diet response to a collapse in pelagic prey populations: Environmental Biology of Fishes. DOI:10.1007/s10641-017-0618-x
Feyrer, F., Slater, S., Portz, D., Odom, D., Morgan-King, T., and Brown, L, 2016, Pelagic nekton abundance and distribution in the northern Sacramento-San Joaquin Delta, California, USA: Transactions of the American Fisheries Society. DOI: 10.1080/00028487.2016.1243577
Bever, A., M. MacWilliams, B. Herbold, L. Brown, and F. Feyrer. 2016. Linking hydrodynamic complexity to delta smelt distribution in the San Francisco Estuary, USA. San Francisco Estuary and Watershed Science, 14(1). jmie_sfews_30419. Retrieved from: http://escholarship.org/uc/item/2x91q0fr
Verhille, C., T. Dabruzzi, D. Cocherell, F. Feyrer, T. Foin, M. Baerwald and N. Fangue. 2016. Inter-population differences in salinity tolerance and osmoregulation of juvenile wild and hatchery-reared Sacramento splittail. Conservation Physiology 2016 4 (1): cov063. DOI: 10.1093/conphys/cov063
Feyrer, F., J. Cloern, L. Brown, M. Fish, K. Hieb, and R. Baxter. 2015. Estuarine fish communities respond to climate variability over both river and ocean basins. Global Change Biology 21(10), 3608-3619, 2015/10/1. DOI: 10.1111/gcb.12969
Feyrer, F., K. Newman, T. Sommer, M. Nobriga. 2015. Delta Smelt Habitat in the San Francisco Estuary: A Reply to Manly, Fullerton, Hendrix and Burnham’s “Comments on Feyrer et al. Modeling the Effects of Future Outflow on the Abiotic Habitat of an Imperiled Estuarine Fish” Estuaries and Coasts DOI: 10.1007/s12237-015-9987-6
Feyrer, F., J. Hobbs, S. Acuna, B. Mahardja, L. Grimaldo, M. Baerwald, R. Johnson, and S. Teh. 2015. Metapopulation ecology of a semi-anadromous fish in a dynamic environment. Canadian Journal of Fisheries and Aquatic Sciences DOI 10.1139/cjfas-2014-0433.
Mahardja, B., B. May, F. Feyrer, R. Coalter, N. Fangue, T. Foin, and M. Baerwald. 2014. Interannual variation in connectivity and comparison of effective population size between two splittail (Pogonichthys macrolepidotus) populations in the San Francisco Estuary. Conservation Genetics DOI 10.1007/s10592-014-0665-1
Sommer, T., B. Harrell, and F. Feyrer. 2013. Large-bodied fish migration and residency in a flood basin of the Sacramento River, California, USA. Ecology of Freshwater Fish doi: 10.1111/eff.12095.
Feyrer. F, D. Portz, D. Odom, D. Contreras, K. Newman, R. Baxter, S. Slater, and E. Van Niewenhuyse. 2013. SmeltCam: underwater video codend for trawled nets with an application to the endangered delta smelt.PLoS ONE 8(7): e67829. doi:10.1371/journal.pone.0067829
Brown, L., W. Bennett, W. Wagner, T. Morgan-King, N. Knowles, F. Feyrer, D. Schoellhamer, M. Stacey, M. Dettinger. 2013. Implications for future survival of delta smelt from four climate change scenarios for the Sacramento-San Joaquin Delta, California. Estuaries and Coasts 36:754-774.
Nobriga, M., E. Loboschefsky, and F. Feyrer. 2012. Common predator, rare prey: exploring juvenile striped bass predation on delta smelt in California’s San Francisco Estuary. Transactions of the American Fisheries Society 142:1563-1575.
Sommer, T., M. Nobriga, L. Grimaldo, F. Feyrer, F. Mejia. 2011. The spawning migration of delta smelt in the upper San Francisco Estuary. San Francisco Estuary and Watershed Science (9)2 http://escholarship.org/uc/item/86m0g5sz.
Feyrer, F., K. Newman, M. Nobriga, and T. Sommer. 2011. Modeling the effects of future outflow on the abiotic habitat of an imperiled estuarine fish. Estuaries and Coasts 34:120-128.
Feyrer, F., J. Hobbs, and T. Sommer. 2010. Salinity inhabited by age-0 splittail as determined by direct field observation and retrospective analyses with otolith chemistry. San Francisco Estuary and Watershed Science 8(2) http://escholarship.org/uc/item/14j5160h.
Mac Nally, R., J.R. Thompson, W.J. Kimmerer, F. Feyrer, K.B. Newman, A. Sih, W.A. Bennett, L. Brown, E. Fleishman, S. Culberson, and G. Castillo. 2010. An analysis of pelagic species decline in the upper San Francisco Estuary using multivariate autoregressive modeling. Ecological Applications 20(5)1417-1430.
Thomson, J., W. Kimmerer, L. Brown, K. Newman, R. Mac Nally, F. Feyrer, E. Fleishman. 2010. Bayesian change-point analysis of temporal patterns in fish abundances in the upper San Francisco Estuary. Ecological Applications 20(5)1431-1448.
Feyrer F., T. Sommer, and S.B. Slater. 2009. Old school vs. new school: status of threadfin shad (Dorosoma petenense) five decades after its introduction to the Sacramento-San Joaquin Delta. San Francisco Estuary and Watershed Science. Vol. 7, Issue 1, Article 3.
Nobriga, M., and F. Feyrer. 2008. Diet composition in San Francisco Estuary striped bass: does trophic adaptability have its limits? Environmental Biology of Fishes 83:495-503.
Baerwald, M., F. Feyrer, B. May. 2008. Distribution of genetically differentiated splittail populations during the non-spawning season. Transactions of the American Fisheries Society 137:1335–1345.
Sommer, T., W. Harrell, Z. Matica, and F. Feyrer. 2008. Habitat associations and behavior of adult and juvenile splittail (Cyprinidae: Pogonichthys macrolepidotus) in a managed seasonal floodplain wetland. San Francisco Estuary and Watershed Science. Vol. 6, Issue 2, Article 3.
Nobriga, M., T. Sommer, F. Feyrer, and K. Fleming. 2008. Long-term trends in summertime habitat suitability for delta smelt, Hypomesus transpacificus. San Francisco Estuary and Watershed Science. Vol. 6, Issue 1 (February), Article 1.
Feyrer, F., T. Sommer, and J. Hobbs, 2007. Living in a dynamic environment: variability in life history traits of age-0 splittail in tributaries of San Francisco Bay. Transactions of the American Fisheries Society 136:1393-1405.
Sommer, T., C. Armor, R. Baxter, R. Breuer, L. Brown, M. Chotkowski, S. Culberson, F. Feyrer, M. Gingras, B. Herbold, W. Kimmerer, A. Mueller-Solger, M. Nobriga, and K. Souza. 2007. The collapse of pelagic fishes in the upper San Francisco Estuary. Fisheries 32:270-277.
Feyrer, F., M. Nobriga, and T. Sommer. 2007. Multi-decadal trends for three declining fish species: habitat patterns and mechanisms in the San Francisco Estuary, California, U.S.A. Canadian Journal of Fisheries and Aquatic Sciences 64:723-734.
Nobriga, M., and F. Feyrer. 2007. Shallow-water piscivore-prey dynamics in the Sacramento-San Joaquin Delta. San Francisco Estuary and Watershed Science Vol.5, Issue 2, Article 4.
Sommer, T., R. Baxter, and F. Feyrer. 2007. Splittail revisited: how recent population trends and restoration activities led to the "delisting" of this native minnow. Pages 25-38 in M.J. Brouder and J.A. Scheuer, editors. Status, Distribution, and Conservation of Freshwater Fishes of Western North America. American Fisheries Society Symposium 53. Bethesda, Maryland.
Feyrer, F., J.A. Hobbs, M. Baerwald, T. Sommer, Q. Yin, K. Clark, B.P. May, and W.A. Bennett. 2007. Otolith microchemistry provides information complimentary to microsatellite DNA for a migratory fish. Transactions of the American Fisheries Society 136:469-476.
Baerwald, M., V. Bien, F. Feyrer, and B. May. 2007. Microsatellite analysis reveals two genetically distinct splittail (Pogonichthys macrolepidotus) populations in the San Francisco estuary. Conservation Genetics 8:159-167.
Feyrer, F, T. Sommer, and W. Harrell. 2006. Managing floodplain inundation for native fish: production dynamics of age-0 splittail in California’s Yolo Bypass. Hydrobiologia 573:213-216.
Feyrer, F, T. Sommer, and W. Harrell. 2006. Importance of flood dynamics versus intrinsic physical habitat in structuring fish communities: evidence from two adjacent engineered floodplains on the Sacramento River,California. North American Journal of Fisheries Management 26:408-417.
Nobriga, M., F. Feyrer, and R. Baxter. 2006. Aspects of Sacramento pikeminnow biology in nearshore habitats of the Sacramento-San Joaquin Delta. Western North American Naturalist 66:106-114.
Nobriga, M., F. Feyrer, R. Baxter, and M. Chotkowski. 2005. Fish community ecology in an altered river delta: spatial patterns in species composition, life history strategies, and biomass. Estuaries 28:776-785.
Kimmerer, W., S. Avent, S. Bollens, F. Feyrer, L. Grimaldo, P. Moyle, M. Nobriga, and T. Visintainer. 2005. Variability in length-weight relationships used to estimate biomass of estuarine fish from survey data. Transactions of the American Fisheries Society 134:481-495.
Feyrer, F., T. Sommer, and R. Baxter. 2005. Spatial-temporal distribution and habitat associations of age-0 splittail in the lower San Francisco Estuary watershed. Copeia 2005:159-168.
Feyrer, F., T. Sommer, G. O’Leary, S. Zeug, and W. Harrell. 2004. Fish assemblages of perennial floodplain ponds of the Sacramento River, California (U.S.A.), with implications for the conservation of native fishes. Fisheries Management and Ecology 11:335-344.
Feyrer, F. 2004. Ecological segregation of native and alien larval fish assemblages in the southern Sacramento-San Joaquin Delta. Pages 67-80 in F. Feyrer, L.R. Brown, R.L. Brown, and J.J. Orsi, editors. Early Life History of Fishes in the San Francisco Estuary and Watershed. American Fisheries Society, Symposium 39, Bethesda, Maryland.
Sommer, T., W. Harrell, R. Kurth, F. Feyrer, S. Zeug, and G. O’Leary. 2004. Ecological patterns of early life stages of fishes in a river-floodplain of the San Francisco Estuary. Pages 111-124 in F. Feyrer, L.R. Brown, R.L. Brown, and J.J. Orsi, editors. Early Life History of Fishes in the San Francisco Estuary and Watershed. American Fisheries Society, Symposium 39, Bethesda, Maryland.
Feyrer, F., B. Herbold, S.A. Matern, and P.B. Moyle. 2003. Dietary shifts in a stressed fish assemblage: consequences of a bivalve invasion in the San Francisco Estuary. Environmental Biology of Fishes 67:277-288.
Feyrer, F., and M. Healey. 2003. Fish community structure and environmental correlates in the highly altered southern Sacramento-San Joaquin Delta. Environmental Biology of Fishes 66:123-132.
Feyrer, F., and M. Healey. 2002. Structure, sampling gear and environmental associations, and historical change in the southern Sacramento-San Joaquin Delta fish assemblage. California Fish and Game 88:126-138.
Sommer, T., L. Conrad, G. O’Leary, F. Feyrer, and W. Harrell. 2002. Spawning and rearing of splittail in a model floodplain wetland. Transactions of the American Fisheries Society 131:966-974.
Feyrer, F., and R. Baxter. 1998. Splittail fecundity and egg size. California Fish and Game 84:119-126.