Daily Archives: November 22, 2012

Can we please have a scientific cormorant policy in Minnesota?

After hundreds of studies, it has been difficult to link fish predation by cormorants (Phalacrocorax auritus) to the reduction of fishing quality in Minnesota lakes. It appears that game fish such as walleye and northern pike make up from less than 1% to nearly 3% of the bird’s diet. They eat only small fish. Many of the fish they eat are perch, which prey on walleye, and it is even possible that by culling small walleye or northerns, they increase the growth rate for those fish in two way. One is by reducing competition between fish for food, and the other is by exerting selective pressure for faster growth.

When cormorants were heavily culled on Leech Lake a few years ago, the Walleye fishing got better. The fishermen and resort owners hailed the killing of the birds as a great thing and attributed the improved fishing to the culling policy. However, the lake simultaneously underwent a very aggressive restocking, and slot limits had been imposed at the same time. The fisherman and resort owners are, sorry to say, being stupid about this, rejecting the science, and possibly shooting themselves in the foot.

Two Minnesota Congressmen have been behind changing federal law to allow widespread killing off of cormorants in the state. This, I believe, is unbecoming of a member of Congress who have the responsibility of paying attention to the science, and of being stewards of our national resources at a level greater than a few local whiny mayors and resort owners.

This issue has been brewing for a few years and will continue. I am hoping that the recent focus on the importance of science in developing public policy will mean a more intelligent, less immature and misinformed cormorant policy in Minnesota over the next few years.

Sources and resources on Cormorants (Phalacrocorax auritus):

  • Most-hated bird in the world: Sanctioned killing of cormorants continues unabated in Minnesota (MinnPost)
  • Expert Linda Wires on MPR
  • DNR Cormorant page
  • Audubon Minnesota position paper on cormorants
  • House Bill HR 3074 sponsored by Representative John Kline (Rep-MN2)
  • Photographs of Double Crested Cormorants
  • Climate Change from the Biotic to the Exotic

    How will climate change affect the flavor of wine? Are warming oceans responsible for the recent global jellyfish outbreak? Do we know how a rise in atmospheric carbon dioxide will affect poison ivy, tobacco, or even sea anemones? NCSE climate change project director talks about what the research shows and future questions to be answered. Sponsored by the Bay Area Skeptics.

    Time might actually be Wibbly Wobbly Timey Wimey…Stuff

    BaBar data recently analyzed might confirm that time is wibbly wobbly timey wimey stuff.

    If you are a B meson, time may not run the same in both directions for you. This is based on a report in Physical Review Letters called “Observation of Time-Reversal Violation in the B0 Meson System” which has this abstract:

    I had to use a screen shot because I can't type in all that wiggly wobbly formula stuff.

    Nature Blogs’s Eugenie Samuel Reich explains this HERE. If that is not clear, just watch this video: