Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (854.0 KB bytes)

Title: Reduced detrital resources limit Pycnopsyche gentilis (Trichoptera: Limnephilidae) production and growth

Author: Eggert, Susan L.; Wallace, J. Bruce;

Date: 2003

Source: Journal North American Benthol. Society 22(3): 388-400

Publication Series: Scientific Journal (JRNL)

Description: Leaf inputs in temperate forest streams may limit caddisfly production because leaf detritus serves both as a food and case-material resource. We estimated Pycnopsyche gentilis produdion in a stream experimentally decoupled fmm its riparian habitat and a reference stream for 8 y in the southern Appalachians. We also examined laboratory survivorship, growth, and case-building activities of P. gentilis in substrate containing various quantities of leaf material. Pycnopsyche gentilis produdion declined to 0 within 3 y of the start of litter exclusion. Abundance, biomass, and production of P. gentilis were positively related to leaf litter standing naps. Maxixnum individual length, of P. gentilis was reduced when annual leaf standing crops fell below 25 to 50 g AFDM/m2. Observations of case construction for instars removed from their origninal leaf cases and kept in substrate with low leaf standing crop, showed that P. gentilis was capable of rebuilding a case of available substrate and surviving for 3 to 4 wk before dying of starvation Survivorship and growth were significantly greater for larvae reared at high and intermediate leaf standing crops, than at low leaf standing crop. Older instars had higher survivorship rates but lower growth rates than younger instars in the low litter substrates. Survivorship and growth rates were lower for some individuals forced to rebuild new cases, indicating an energetic cost associated with case-building activities. Our results demonsrate that the linkage between terrestrially derived organic matter and production of a caddisfly shredder was a consequence of food availability.

Keywords: Case-building behavior, caddisfly, organic matter, macroinvertebrates, stream, resource limitation

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Eggert, Susan L.; Wallace, J. Bruce 2003. Reduced detrital resources limit Pycnopsyche gentilis (Trichoptera: Limnephilidae) production and growth. Journal North American Benthol. Society 22(3): 388-400

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.