hero image
Tim Bradley - UC Irvine. Irvine, CA, US

Tim Bradley Tim Bradley

Professor of Ecology and Evolutionary | UC Irvine


Tim Bradley studies physiological ecology and conservation biology at salt lakes. His current focus is the Salton Sea.



Tim Bradley Publication




Interview with Tim Bradley




Tim Bradley's laboratory is engaged in studies of physiological ecology, the evolution of physiological processes, the physiology of respiration and energy metabolism, and conservation biology at salt lakes.

Areas of Expertise (5)

Salton Sea

Evolution of Physiological Processes


Physiological Ecology

Energy Metabolism

Accomplishments (1)

Daniel G. Aldrich, Jr. Distinguished University Service Award (professional)


Media Appearances (3)

Salton Sea odor alert extended through Thursday. Rotten egg stench will linger a bit longer

Desert Sun  online


Tim Bradley, director of the UC Irvine Salton Sea Initiative, is studying algae as the lake grows saltier. He's concerned the state may be unprepared to deal with the dust as the lake shrinks.

view more

Salton Sea: Fish and the birds that fed on them wiped out this winter

Desert Sun  online


Tim Bradley crunched across a broad beach made of dead barnacles and fish bones. He bent down and stirred green slime, tinged with brown foam at the western edge of the vast lake unfurled before him. It was a sign for the longtime biologist that the much-maligned Salton Sea is alive.

view more

UCI biologist named to Salton Sea science advisory committee

UCI News  online


The California Natural Resources Agency has named University of California, Irvine biologist Tim Bradley to the science advisory committee for the state effort to preserve its largest inland body of water.

view more

Articles (5)

Aerobic function in mitochondria persists beyond death by heat stress in insects

Journal of Thermal Biology

Heinrich, E., E. Gray, A. Ossher, S. Meigher, F. Grun, T.J. Bradley

2017 The critical thermal maximum (CTmax) of insects can be determined using flow-through thermolimit respirometry. It has been demonstrated that respiratory patterns cease and insects do not recover once the CTmax temperature has been reached. However, if high temperatures are maintained following the CTmax, researchers have observed a curious phenomenon whereby the insect body releases a large burst of carbon dioxide at a rate and magnitude that often exceed that of the live insect. This carbon dioxide release has been termed the post-mortal peak (PMP).

view more

Starvation but not locomotion enhances heart robustness in Drosophila

Journal of Insect Physiology

Kezos JN, L.G. Cabral, B.D. Wong, B.K. Khou, A. Oh, J.F. Harb, D. Chiem, T.J. Bradley, L.D. Mueller, M.R. Rose

2017 Insects and vertebrates have multiple major physiological systems, each species having a circulatory system, a metabolic system, and a respiratory system that enable locomotion and survival in stressful environments, among other functions. Broadening our understanding of the physiology of Drosophila melanogaster requires the parsing of interrelationships among such major component physiological systems.

view more

Hypotheses regarding the discontinuous gas exchange cycle (DGC) of insects

Current Opinion in Insect Science

Contreras, H.L., E.C. Heinrich & T.J. Bradley

2014 The evolutionary origin of the insect respiratory pattern referred to as the discontinuous gas exchange cycle (DGC) has been a topic of extensive discussion among insect physiologists for at least 50 years. This pattern has often been thought to reduce respiratory water loss (RWL). However, because this pattern does not consistently conserve water among all taxa, other hypotheses have been proposed to try and explain the significance of the DGC.

view more

Temperature dependent variation in respiratory patterns and spiracular control in Rhodnius prolixus

The FASEB Journal

Erica Heinrich and Timothy Bradley

2013 Our understanding of insect respiratory control indicates that spiracular activity is regulated by two interacting feedback loops which respond to changes in internal pCO2 and pO2. Since spiracles open in response to a specific pCO2 threshold, the volume of CO2 released in a burst by a discontinuously respiring insect should remain constant. However, previous studies which manipulated metabolic rate via temperature found that burst volume decreases at high temperatures.

view more

Coordinated ventilation and spiracle activity produce unidirectional airflow in the hissing cockroach, Gromphadorhina portentosa

Journal of Experimental Biology

Erica C. Heinrich, Matthew J. McHenry, Timothy J. Bradley

2013 Insects exchange respiratory gases via an extensive network of tracheal vessels that open to the surface of the body through spiracular valves. Although gas exchange is known to increase with the opening of these spiracles, it is not clear how this event relates to gas flow through the tracheal system.

view more