MAY 11, 2016 New DEATH ZONE
54 views · Published 20 May 2016 · 4:53 · Indexed 9 October 2026
Channel: Sea lion Defense Brigade · 2016 · Education
"Predation is frequently associated with “approximate” cause of mortality because "virtually any factor that weakens or disorientates a salmon will increase the probability of predation.” --- Dr. Gary Grossman For example, copper concentrations commonly found in the Ca Delta waters produces abnormal behaviors in Coho salmon that render them more susceptible to predators. In this case predation may be the "approximate” cause of mortality but the contaminant is actually the "ultimate" cause. “When considering salmon mortality one must distinguish between approximated and ultimate causes of death because management efforts as expensive as they are can only be so successful when they address the "ultimate" causes." --Dr. Gary Grossman Since 1981, Dr. Grossman has been a professor of animal ecology from the University of Georgia. His primary research areas are “population dynamics and habitat selection and fishes.” He has published over one hundred and fifteen scientific papers, cited over 5,000 times. For the last twenty years has been advising fisheries agencies in California. In addition, in 2013 led a public hearing on the effects of fish predation on endangered salmonids that produced a technical report. He has recently completed a general review on the effects of predators on San Joaquin Deltas fishes, to be published in “State of Delta’s Science”
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