Dr. John Valentine
Professor, University of South Alabama
Executive Director, Dauphin Island Sea Lab
Ph.D. 1989, University of Alabama
Emphasis: Experimental Marine Ecology, Plant-animal interactions, Habitat Linkages, Human-Dominated Ecosystems.
My current research interests examine the role of biotic processes, and human perturbations, in controlling the flow of energy among trophic levels both within and between marine habitats, with emphasis on submerged vegetated habitats. This research is being conducted in diverse locations ranging from the lower reaches of the Mobile Bay Delta to the Marine Protected Areas of the northern Florida Keys. Much of the emphasis of this work is on
1) experimental assessments of grazing intensity in seagrass habitats,
2) responses of seagrasses to this grazing, and
3) the role of omnivory in controlling trophic cascades in marine systems.See More
Newly funded work will examine
1) the degree to which marine production can subsidize the diets adult freshwater piscivorous fishes in oligohaline vegetated habitats in the northern Gulf of Mexico,
2) the relative value of infaunal functional groups to demersal fish growth, also in the northern Gulf of Mexico and
3) the indirect effects of the removal of large predatory fishes on the base of seagrass food webs in the Florida Keys.
Finally, one planned project will be to investigate the degree to which seagrass detritus can subsidize the productivity of macroinvertebrates in nearby unvegetated habitats. The overall significance of this research lies in its attempt to understand the processes that control the distribution and productivity of submerged vegetated habitats throughout the western Atlantic Ocean. Because of the widespread occurrence of these habitats, the extraordinary productivity and richness of their associated biota, an understanding of the factors controlling their distribution and the degree to which they subsidize the productivity of nearby less productive habitats is essential to our understanding of how the overall productivity of nearshore waters is determined.
Selected Current Research Grants
Lead PI - Alabama Center for Ecological Resilience. Gulf of Mexico Research Initiative (2015-2018). - $6,497,054
Food & Drug Administration (FDA) and MESC/Dauphin Island Sea Lab Collaboration - $790,000
National Science Foundation - "Collaborative Proposal: Gulf Coast ADVANCE: Cross Institutional Synergy for Women Scientist - $44,652.00
Steele, L. and J. Valentine. 2015. Seagrass deterrence to mesograzer herbivory: evidence from mesocosm experiments and feeding preference trials. Marine Ecology Progress Series. 524: 83-94.
Martin, C.W., and J.F. Valentine. 2014. Tolerance of Embryos and Hatchlings of the Invasive Apple Snail Pomacea maculata to Estuarine Conditions. Aquatic Ecology 48: 321-326.
Martin, C.W., and J.F. Valentine. 2014. Sexual and asexual reproductive strategies of invasive eurasian milfoil (Myriophyllum spicatum) in estuarine environments. Hydrobiologia. 727: 177-184.See More
Blackmon, D., and J.F. Valentine. 2013. Recurring nocturnal benthic emergence along the coral reef-seagrass interface in the Florida Keys National Marine Sanctuary: evidence of a possible novel prey escape response. Journal of Experimental Marine Biology and Ecology. 448: 220-227.
Peterson, B.J., J.F. Valentine and K.L. Heck, Jr. 2013. The Snapper-Grunt pump: habitat modification and facilitation of the associated benthic plant communities by reef resident fish. J. Experimental Marine Biology and Ecology. 441: 50-54.
Rozas, L.P., C.W. Martin and J.F. Valentine. 2013. Effects of reduced hydrological connectivity on the nursery function of shallow estuarine habitats within a river delta. Marine Ecology Progress Series. 492: 9-20.
Shepard, A., J.F. Valentine, C. F. D’Elia, D.W. Yoskowitz, D. E. Dismukes. 2013. Economic impact of Gulf of Mexico: integrating ecosystem service values into restoration decision-making. Gulf of Mexico Science. 31: 10-27
Martin, C.W., K.M. Baya, and J.F. Valentine. 2012. Establishment of the invasive island apple snail Pomacea insularum (Gastropoda: Ampullariidae) and eradication efforts in Mobile, Alabama, USA. Gulf of Mexico Science. 30: 30-38.
Puntila,R.I., C.W. Martin, and J.F. Valentine. 2012. Measuring predation with a new design of submersible chronographic timer. Bulletin of Marine Science 88: 1115-1122.
Steele, L., and J.F. Valentine. 2012. Idiosyncratic responses of seagrass phenolic production following sea urchin grazing. Marine Ecology Progress Series. 466:81-92.
Lemoine, N.P., and J.F. Valentine. 2012. Structurally complex habitats provided by Acropora palmata influence ecosystem processes on a reef in the Florida Keys National Marine Sanctuary. Coral Reefs. 31: 779-786
Martin, C.W. and J.F. Valentine. 2012. Eurasian milfoil invasion in Mobile Bay, Alabama: evidence that disturbance can reduce the proliferation of an aquatic nuisance species. Marine Ecology Progress Series. 449:109-119.
Hayworth, J.S., T.P. Clement, and J.F. Valentine. 2011. Deepwater Horizon oil spill impacts on Alabama beaches. Hydrol. Earth Syst, Sci. Discuss. 8: 6721-3741.
Martin, C.M. and J.F. Valentine. 2011. Impacts of a habitat-forming exotic species on estuarine structure and function: an experimental assessment of eurasian milfoil. Estuaries and Coasts. 34: 364-372.
Martin, C.M., M. Valentine and J.F. Valentine. 2010. Competitive Interactions between Invasive Nile Tilapia and Native Fish: the Potential for Altered Trophic Exchange and Modification of Food Webs. PLoSONE. 5:1-6