• Home
  • About
  • Email List
  • Past Speakers
  • SFNHS Coordinator
  • Upcoming Speakers

SF Natural History Series

A lecture series exploring nature in the San Francisco Bay Area

Feeds:
Posts
Comments
« Next Talk, Thursday October 22nd
Next Talk, Thursday, November 19th »

I Now Know Newts

November 1, 2009 by Adrian Cotter

my lecture notes for Karen Goetz's lecture

I now know at least a little bit about newts. Karen Goetz, with beautiful photographs,  introduced us to the natural history of the California Newt (Taricha torosa). Karen, as part of her graduate studies in Conservation biology, had studied how female newts selected their egg laying sites in the hills of the East Bay.

She lead with the life cycle of these amphibian’s (a type of salamander in fact): from their start as eggs the size of o large cherry, through their larval stage on into their adult life, their mating habits, and how they lay eggs, growing 6-8 inches, with toxins in their skin, and living for a surprisingly long time (20 years at least in the wild, with a record of 35 in captivity). Despite their toxic skin, they still have their predators, crayfish and garter snakes, and other newts as well.

What Karen had studied in particular was where the female salamanders lay their eggs. It turns out they tend to lay their eggs in deeper pools (greater than 37cm in depth), on woody objects of 9mm diameter or greater,  near muddy banks. Her hypothesis being that their choice relates a lot to biomechanics — how eggs fare in the seasonal flooding of California creeks: eggs fare best when laid on woody branches resilient to turbulent waters, and deep enough that they would avoid being hung out to dry before the eggs hatched.

Her pictures from under the water were ethereal glimpses of the lives of these animals. Probably the part we know best, as when they crawl out from the creek, there’s not a lot of data of how far, or doing what. We do know that newts, like many other amphibians, are vulnerable because they are so dependent on water for such a crucial part of their life. Humankind has had a huge impact in what it has been putting into the water, as well as how the water flows.

Share this:

  • Click to share on Facebook (Opens in new window)
  • Click to share on Tumblr (Opens in new window)
  • Click to share on Pinterest (Opens in new window)
  • Click to share on Twitter (Opens in new window)
  • Click to email a link to a friend (Opens in new window)

Like this:

Like Loading...

Related

Posted in Lecture Notes |

  • SFNHS

    Our lecture series explores all aspects of nature in the Bay Area, and seeks to understand our impact both past and present on those natural systems, and their impact on us.
  • Find Us Elsewhere

    • Facebook
    • Google+
    • Twitter
  • Local Science & History

    • Ask a Scientist SF
    • California Center for Natural History
    • California Naturalist Program
    • Friends of Five Creeks
    • Nature in the City
    • Shaping SF
    • The Long Now Seminars
    • Think Walks
    • Urban Adventures for Kids
  • Our Hosts

    • Exploratorium Bay Observatory Gallery
    • Green Apple Books
    • Rotary Nature Center
    • SF Public Library
    • The Randall Museum
  • Science in Other Cities

    • Bay to Beach Life
    • NYC Wildlife
  • Speaker

    • Cartographer's Notebook
    • Keith Hansen
    • Marin Carbon Project
    • Nowtopians
  • SF Naturalist

    • RT @Sierra_Jobs: Are you interested in developing web applications, and shaping technical solutions for complex use cases at a mission-cent… 6 months ago
    • @Longreads @jkehe @WIRED This does just essentially seem like a reboot of intelligent design. Why is it easier to b… twitter.com/i/web/status/1… 11 months ago
    • My couple minutes of Corvid fame on @kalw's @CrosscurrentsFM this week -- shoutout to friends who clued me in to th… twitter.com/i/web/status/1… 1 year ago
  • Archives

    • July 2018
    • January 2017
    • June 2016
    • April 2016
    • March 2016
    • February 2016
    • November 2015
    • October 2015
    • August 2015
    • July 2015
    • June 2015
    • May 2015
    • April 2015
    • March 2015
    • February 2015
    • January 2015
    • November 2014
    • October 2014
    • September 2014
    • July 2014
    • June 2014
    • May 2014
    • April 2014
    • March 2014
    • February 2014
    • January 2014
    • October 2013
    • September 2013
    • August 2013
    • July 2013
    • June 2013
    • May 2013
    • April 2013
    • March 2013
    • February 2013
    • January 2013
    • December 2012
    • October 2012
    • August 2012
    • July 2012
    • May 2012
    • April 2012
    • February 2012
    • January 2012
    • November 2011
    • October 2011
    • August 2011
    • July 2011
    • June 2011
    • May 2011
    • April 2011
    • March 2011
    • February 2011
    • January 2011
    • December 2010
    • November 2010
    • October 2010
    • September 2010
    • August 2010
    • July 2010
    • June 2010
    • May 2010
    • April 2010
    • February 2010
    • January 2010
    • November 2009
    • October 2009
    • September 2009
    • August 2009
    • July 2009
    • June 2009
    • May 2009
    • March 2009

Blog at WordPress.com.

WPThemes.


  • Follow Following
    • SF Natural History Series
    • Join 35 other followers
    • Already have a WordPress.com account? Log in now.
    • SF Natural History Series
    • Customize
    • Follow Following
    • Sign up
    • Log in
    • Copy shortlink
    • Report this content
    • View post in Reader
    • Manage subscriptions
    • Collapse this bar
 

Loading Comments...
 

    %d bloggers like this: