Early Registration Deadline
12 February 2010

Travel Award & Grant Recipients Notified
March 2010

Authors Notified
April 2010

Schedule Posted
January 2010

Peterson, S. D., Southern Illinois University/ Department of Zoology and Center for Ecology, Carbondale, IL, USA, pete13@siu.edu
Rugenski, A. T., Southern Illinois University/ Department of Zoology and Center for Ecology, Carbondale,IL, USA, arugenski@yahoo.com
Colon-Gaud, J. C., University of Puerto Rico- Rio Piedras/ Institute for Tropical Ecosystem Studies, San Juan, Puerto Rico, checo@siu.edu
Whiles, M. R., Southern Illinois University/ Department of Zoology and Center for Ecology, Carbondale,IL, USA, mwhiles@zoology.siu.edu
Kilham, S. S., Drexel University/ Department of Biology, Philadelphia, PA, USA, kilhams@drexel.edu
Lips, K. R., University of Maryland/ Department of Biology, College Park, MD, USA, klips@umd.edu
Pringle, C. M., University of Georgia/ Institute of Ecology, Athens, GA, USA, cpringle@uga.edu

INFLUENCES OF CATASTROPHIC AMPHIBIAN DECLINES ON STORAGE AND EXPORT OF FINE PARTICULATE ORGANIC MATTER IN NEOTROPICAL HEADWATER STREAMS

Larval amphibians can be important in tropical streams because their feeding and egestion can enhance food availability to other consumers. As part of the Tropical Amphibian Declines in Streams (TADS) project, we are examining the long-term ecological consequences of stream-breeding amphibian extirpations in the Panamanian Highlands. We sampled fine (<1mm, >250μm) and very fine (<250μm) benthic organic matter and organic seston (<754μm) for multiple years in streams at El Cope, where a recent amphibian decline occurred, and Fortuna, which declined over a decade ago. In El Cope streams, post-decline benthic organic matter standing stocks remained similar to pre-decline (74.5 and 73.4 gAFDM/m2, respectively). Organic seston C/N in Fortuna streams averaged 10.4, while El Cope increased from 9.0 (pre-decline) to 10.6 (post-decline). At El Cope, base flow organic seston concentrations decreased from 2.7mg L-1 (pre-decline) to 1.4mg L-1 (post-decline). Increased C/N and lower concentrations of seston indicate that amphibian declines alter the quantity and quality of organic materials exported from tropical headwater streams, but may not affect benthic organic matter standing stocks, at least within the time frames we examined.

Poster presentation

Session #:T24
Date: 06-10-10
Time: 17:30 - 19:30

Presentation is given by student: No