Saturday, May 20, 2006 Shopping Cart (2 Items)    Log Out  
 Online Journals
Online Journals Home
About Journals
Search
Browse
 Account
Account Home
Shopping Cart
Order History
Activate Access
Register
 Services
Services Home
Favorites
Alerting
ActiveSearch
 Support
Support Home
Contact Us
Downloads
Exports
  
Article Back To:  Main    Publication    Issue 

  

Israel Journal of Zoology
  Issue:  Volume 47, Number 4 / 2001
  Pages:  387 - 396
  URL:  Linking Options

   Special Issue: Ecology of Temporary Pools
  Guest Editor(s): L. Blaustein and S.S. Schwartz
 
HABITAT EPHEMERALITY AND HATCHING FRACTIONS OF A DIAPAUSING ANOSTRACAN (CRUSTACEA: BRANCHIOPODA)

THOMAS E. PHILIPPI A1, MARIE A. SIMOVICH A2, ELLEN T. BAUDER A3, JACOB A. MOORAD A4, JACOB A. MOORAD A5

A1 University of Georgia Savannah River Ecology Lab, Aiken, South Carolina 29802, USA
A2 Department of Biology, University of San Diego, 5998 Alcala Park, San Diego, California 92110, USA
A3 Department of Biology, San Diego State University, San Diego, California 92182-4614, USA
A4 Department of Marine and Environmental Science, University of San Diego, 5998 Alcala Park, San Diego, California 92110, USA
A5 Department of Biology, Indiana University, Bloomington, Indiana 47405-3700, USA

Abstract:

Diapause allows aquatic organisms to survive periods of drydown in intermittent pools. However, often not all of the individuals hatch in response to a filling event. This prolonged diapause (diapause lasting through one or more favorable periods) is the likely consequence of several factors. We address the possibility that prolonged diapause in fairy shrimp in Southern California vernal pools is a bet-hedging adaptation to unpredictability in the duration of filling events. Under the simplest bet-hedging model of selection on prolonged diapause, the fraction of eggs hatching in any filling event should approximate the fraction of filling events lasting long enough for successful reproduction.

We quantified filling durations in seven pools of coastal San Diego County, California for all winter and spring events between 1983 and 1996. The distributions of filling durations did not differ significantly among pools, so selection should be similar across pools. When the 189 filling durations were combined into a single estimated probability distribution, approximately 28% of the filling events lasted 17 days or longer, the developmental time to first reproduction (under field conditions) in the fairy shrimp Branchinecta sandiegonensis (Branchiopoda: Anostraca) inhabiting these pools. Previous laboratory hatching experiments determined a maximum hatching rate of 28% at 10 C, with lower hatching percentages at higher and lower temperatures.


The references of this article are secured to subscribers.


  
 Full Text Access
Full Text Secured

The full text of this article is secured to subscribers. To gain access, you may:

   Subscribe to this publication.

Subscribe

   Add this item to your shopping cart for purchase later.

Add to Shopping Cart

   Purchase this item now.

Purchase Item Now

   Log in to verify access.

Log In



  


For more information feel free to contact us:
E-Mail: laserpages@netmedia.net.il
Fax: 972-2-652-2277 Tel: 972-2-652-2226
Laser Pages
P.O. Box 35409
Jerusalem 91352, Israel
©2006 Laser Pages
All Rights Reserved.

Remote Address: 209.128.119.47 • Server: MPWEB08
HTTP User Agent: Mozilla/5.0 (compatible; heritrix/1.6.0 +http://innovationblog.com)