Problem
A. Bigg's (Transient) orcas have a higher concentration of PCBs in their body than Southern Resident orcas, even though they are frequently found in the same waters. What do you think causes this pattern?
B. Male orcas have a higher concentration of PCBs in their body than female orcas. What you think causes this pattern? Explain your answer.
C. Explain how eutrophication can lead to the formation of a dead zone. Include what metabolic processes are involved to cause the hypoxia.
D. Dead zones have been recorded in the Hood Canal region of the Puget Sound as well as some areas off of the Washington and Oregon coasts. Describe two different possible causes for increased eutrophication in these areas.