RESEARCH THEME - 1 Whole-animal responses to environmental stress
Early in my research career, I conducted a rigorous assessment of the physiological responses to decompression stress caused by fishing, injuries resulting from swim bladder overexpansion and gas embolisms. This seminal research has been well cited and is utilized as a model for fisheries management surrounding catch-and-release protocols and conservation organizations worldwide.
Rummer J.L. & Bennett W.A. 2005. Physiological effects of swim bladder overexpansion and catastrophic decompression on red snapper, Lutjanus campechanus. Transactions of the American Fisheries Society 134(6): 1457-1470. doi:10.1577/T04-235.1
Rummer. J.L. 2007. Interacting factors affecting release mortality in red snapper with an emphasis on catastrophic decompression and swim bladder form and function. pp.123-144 in W.F. Patterson, III, J.H. Cowan, Jr., G.R. Fitzhugh, & D.L. Nieland, eds. Red Snapper Ecology & Fisheries in the U.S. Gulf of Mexico, American Fisheries Society Symp. 60, Bethesda, Maryland.
More recently, I have standardized techniques for estimating whole animal resting and maximum metabolic rates during exposure to various types of environmental (temperature, hypoxia, and elevated CO2 to simulate ocean acidification) or exercise-induced stress.
Rummer, J.L., Stecyk, J.A.W., Couturier, C.S., Watson, S-A., Nilsson, G.E., Munday, P.L. 2013. Elevated CO2 enhances aerobic scope of a coral reef fish. Conservation Physiology 1, doi:10.1093/conphys/cot023
Rummer, J.L., Couturier, C.S., Stecyk, J.A.W., Gardiner, N.M., Kinch, J.P., Nilsson, G.E., Munday, P.L. 2014. Life on the edge: Thermal optima for aerobic scope of equatorial reef fishes are close to current day temperatures. Global Change Biology 20(4):1055-66. doi:10.1111/gcb.12455
Roche, D.G., Binning, S.A., Bosiger, Y., Johansen, J.L., Rummer, J.L. 2013. Finding the best estimates for metabolic rates in a coral reef fish. Journal of Experimental Biology 216, 2103-2110. doi:10.1242/jeb.082925
Rummer, J.L., Binning, S.A., Roche, D.G., Johansen, J.L. Method matters: The importance of locomotory mode and respirometry technique for estimating metabolic rate in fish. Methods in Ecology and Evolution (in review)
I have also made conclusions as to the temporal scale of thermal acclimation and metabolic performance in coral reef fishes and how this relates to temperature preference, a link crucial to developing management strategies for the conservation of marine biodiversity and the sustainable use of marine fisheries, especially in the advent of climate change. Some of this work has been done by my graduate student, Adam Habary, whom I co-supervise with Dr. Jacob Johansen and Prof. John Steffensen. Other studies under this theme were done in the Caribbean and Dry Tortugas National Park as well as Indonesia in collaboration with Dr. Nann Fangue.
Rummer, J. L., Fangue, N. A., Jordan, H. L., Tiffany, B. N., Blansit, K. J., Galleher, S., Kirkpatrick, A., Kizlauskus, A., Pomory, C. M., Bennett, W. A. 2009. Physiological tolerance to hyperthermia and hypoxia and effects on species richness and distribution of rockpool fishes of Loggerhead Key, Dry Tortugas National Park. Journal of Experimental Marine Biology and Ecology 371(2):155-162
Fangue, N. A., Flaherty, K. E., Rummer, J. L., Cole, G. Hansen, K. S., Hinote, R. Noel, B. L. Wallman, H., Bennett, W.A. 2001. Temperature and hypoxia tolerance of selected fishes from a hyperthermal rockpool in the Dry Tortugas, with notes on diversity and behavior. Caribbean Journal of Science 37(1-2): 81-87. doi:10.1086/589109
Dabruzzi, T.F., Fangue, N.A., Rummer, J.L., Bennett, W.A. 2013. Juvenile Ribbontail Stingray, Taeniura lymma (Forsskål, 1775) demonstrate a unique suite of physiological adaptations to survive hyperthermic nursery conditions. Hydrobiologia 701, 37-49
I have also determined the intra- and inter-specific morphological and physiological variations in swimming performance in coral reef fishes and how fish respond to strong currents and wave energy, which are prominent physical stressors in shallow marine habitats. Much of this work has been via collaborations with Dr. Sandra Binning, Dr. Dominique Roche, and Dr. Jacob Johansen.
Rummer, J.L., Binning, S.A., Roche, D.G., Johansen, J.L. Method matters: The importance of locomotory mode and respirometry technique for estimating metabolic rate in fish. Methods in Ecology and Evolution (in review)
While much of my whole-animal work has been done on adult fishes, I have integrated several studies on larval fishes into my program. I recently collaborated with Dr. Shaun Killen to understand the tradeoffs between dominant behaviours and aerobic metabolic scope in larval coral reef damselfish. In another study, we incorporated these ideas along with climate change scenarios including ocean warming and acidification.
Killen, S.S, Mitchell, M.D., Rummer, J.L., Chivers, D.P., Ferrari, M.C.O., Meekan, M., McCormick, M.I. 2014. Aerobic scope predicts dominance during early life in a tropical damselfish. Functional Ecology (Advanced online publication, 16 June 2014). doi:10.1111/1365-2435.12296
Ferrari, M.C.O., Munday, P.L., Rummer, J.L., McCormick, M.I., Corkill, K., Watson, S-A., Allan, B.J.M, Meekan, M.G., Chivers, D.P. Interactive effects of ocean acidification and rising sea temperatures alter prey mortality and predator selectivity in reef fish communities. Global Change Biology (in review)
One of my recent graduates (Sybille Hess) determined that anatomical development and gas-exchange function of the gills of coral reef fishes can be impaired if larvae are exposed to high concentrations of suspended sediment (e.g. dredge spoil), levels that could occur with storm or agricultural run-off from coastal communities. This work has been in collaboration with Dr. Amelia Wenger and Dr. Tracy Ainsworth.
Hess, S., Wenger, A.S., Ainsworth, T., Rummer, J.L. Rising suspended sediment levels on the Great Barrier Reef pose a risk to fish health. Scientific Reports (in review).
In addition, both temperature and food supply can influence development, growth, and metabolism in larval clownfish. This is important because climate change models predict 2-3°C ocean warming this century, which will also impact plankton communities and therefore food for larval fishes. Recently graduated, Dr. Ian McLeod pioneered this project.
McLeod, I.M., Rummer, J.L., Clark, T.D., Jones, G.P., Wenger, A.S., McCormick, M.I., Munday, P.L. 2013. Climate change and the performance of larval coral reef fishes: the interaction between temperature and food availability. Conservation Physiology 1. doi:10.1093/conphys/cot024