Record Display for the EPA National Library Catalog

RECORD NUMBER: 43 OF 144

OLS Field Name OLS Field Data
Main Title Effects of Experimental Acidification in Macroinvertebrate Drift Diversity in a Mountain Stream.
Author Hall, R. J. ; Pratt, J. M. ; Likens, G. E. ;
CORP Author Cornell Univ., Ithaca, NY.;Environmental Research Lab.-Duluth, MN.
Year Published 1982
Report Number EPA-R-807555; EPA-600/J-82-434;
Stock Number PB84-226562
Additional Subjects Acidification ; Invertebrates ; Ecology ; Stream pollution ; Insects ; Drift ; pH ; Snowmelt ; Diurnal variations ; Mountains ; Stress(Physiology) ; Minnesota ; Reprints ; Mayflies ; Species diversity ; Brilloins formula
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB84-226562 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 17p
Abstract
A small stream (Norris Brook) within the Hubbard Brook Experimental Forest was acidified to determine what effect elevated H+ stress may have on the ecology of a mountain stream. The experiment was designed to simulate a pH level (4.0) that can occur during initial snowmelt (acute period) and during longer term (chronic period) acidification. Daily macroinvertebrate drift samples were collected from treatment and reference areas of Norris Brook. Drift diversity at the generic level was calculated using Brillouin's formula and partitioned hierarchically following macroinvertebrate classifications based on taxonomy (orders) and feeding strategies (functional groups or guilds). The rate of movement of individuals and genera was significantly greater for those organisms leaving the acid-stressed area during the first five days than for those entering, whereas no difference between the rate of macroinvertebrates entering or leaving the acid-stressed area was apparent for either numbers or genera over the remaining 25-day period. (Copyright (c) 1982 by D.Reidel Publishing Co.)