Mayday Monday - Legacy Toxins and Bioaccumulation

Primary Threat #2: Legacy Toxins and Bioaccumulation

Chemical pollution is another major threat to the orcas: the Southern Resident orcas are one of the most contaminated marine mammal populations in the world. They are a long-lived top predator, which makes them incredibly vulnerable to pollutants that accumulate up the food chain. Their home in Puget Sound is very urban, and toxins that originate on land make their way to the rivers and coastal habitats where they are absorbed by tiny plankton - these plankton are eaten by small baitfish and work their way up the food web to the salmon that orcas eat. At every step in the food chain, the concentration of contamination is compounded, a process called biomagnification. 

Toxins of greatest concern are the "persistent organic pollutants" or POPs, such as the pesticide DDT, PCBs (a known carcinogen) and PBDEs, (flame retardants). Exposure to these chemicals is linked to disease in orcas because they depress the immune system and act as endocrine disrupters that cause reproductive problems. These chemicals are known as "legacy toxins" because of their tendency to persist in the environment. Both DDT and PCBs have been banned in the US, but are still present in alarming concentrations in whales' blubber layer. Because these toxins are found in reproducing females, calves will continue to be exposed to - and accumulate - these same "legacy toxins" for generations to come. Young whales have particularly high toxin levels that they acquire from their mothers, who use their fat stores to help the growth and development of their calves. The health of new babies is compromised from the beginning because of this toxin offloading between mother and calf. The level of PCBs found in the blubber of Southern Residents greatly exceeds the level we know to be detrimental to other marine mammals. High levels of toxins play a prominent role in preventing them from increasing at the rate needed for recovery.

Southern Residents and legacy contaminants
Southern Residents are among the most contaminated marine mammals in the world

The three pods differ in their levels of each specific toxin: L and K have higher levels than J pod of DDT, which is more likely to occur off the California coast, indicating that these two pods spend more time feeding on prey there - an area not included in critical habitat but part of the proposed expansion. The National Marine Fisheries Service (NMFS) has collected fecal samples from the Southern Residents as they travel the outer coast, which could provide new information about their contaminant levels, but samples from the past three years have yet to be analyzed and the results made public.

While DDT and PCBs are banned in the US, chemical pollution is still an issue because of historic use, retention in blubber, and their use in developing countries where they still enter the ocean and circulate to west coast waters. Critical habitat will not directly help to remove threats associated with toxin exposure and accumulation, but will help manage the ongoing harmful human actions that affect the Southern Residents, and adds protection from any future activities that may result in more toxins entering their habitat. The severity and persistence of these toxins makes it all the more important that we take what actions we can to lessen other stressors.

Help us expand the Southern Residents' critical habitat by signing our letter urging NMFS to act NOW.

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Southern Resident orca San Juan Island
Southern Residents swim past San Juan Island

Comments

Please expand this critical habitat.

Save our Oceans; save the LIFE within our Oceans!

Stop the inhumane treatment of these highly intelligent souls!

We need all our God's Wildlife for the balance of nature and the natural laws of our excellent environment. Nothing is worth losing this treasure!

Please act now to save our Southern Resident Orcas for generations to come. They are counting on us. They didn't ask for their habitat to be tainted by toxins and chemicals. Let's be their voice. Thank you

Act now to save the Orcas, thank you.

Help the Orcas is our priviledge and duty!

Protect our waters and our whales.

We must do more to protect our orcas from the toxins in the ocean. Not only are these toxins bad for the orcas, they are bad for all living beings, including humans.

Hello. The need for protection and remediation is as of DECADES ago. Human pest-like behavior is destroying our biosphere as it monetizes everything and elevates the financial spreadsheet as our highest religion. ENOUGH!

There is no amount of money that makes giving big corporations the
right of way to kill our environment and our creatures and ourselves
a good idea. The definition of insanity is doing the same thing over
and over again, expecting different results. Take heed and do the right thing.

Oceans matter more. Protecting the oceans/Orcas, marine life recipricates in keeping humans healthy as well.

Saving the oceans and the live that depends on it, saves us all. We, all living being are important to our fragile eco-system.

We need to start taking responsibility for the harm we have done to our planet before it's too late.

Toxins not only effect the ocean but every living thing on this planet. Time to take responsibility for the harm done and repair before it's too late

#respect + #protect

Southern Resident orcas need critical habitat expanded. We must do more to protect them from the multiplicity of toxins in the ocean, before we lose them forever.

We need to stop the toxins killing not only the Orcas but our planet too.

Please expand the Orca's critical habitat and do more to eliminate and outlaw chemical pollution of our waters.

Please expand the orcas critical habitat and outlaw chemicals being dumped Into the Ocean

Quit poisoning the bay's!!!!!!!!!

Give a hoot, don't pollute!

For the love of aquatic life/human life, stop chemical dumping into our waters/oceans.

Orcas are an apex predator also on the endangered species list we should be doing all we can to protect them and shut down the establishments that keep them