Effects of alternatives to clearcutting on invertebrate and organic detritus transport from headwaters in southeastern Alaska / Jake Musslewhite and Mark S. Wipfli.

Format:

Book

Government document

Author/Creator:

Musslewhite, Jake.

Contributor:

Wipfli, Mark S. (Mark Steven)

Pacific Northwest Research Station (Portland, Or.)

Series:

General technical report PNW ; 602.

General technical report PNW ; 602

Language:

English

Subjects (All):

Logging--Environmental aspects--Alaska, Southeast.

Logging.

Stream ecology--Alaska, Southeast.

Stream ecology.

Stream invertebrates--Effect of logging on--Alaska, Southeast.

Stream invertebrates.

Logging--Environmental aspects.

Southeast Alaska.

Physical Description:

1 online resource (28 pages).

Place of Publication:

Portland, OR : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [2004]

Summary:

"We examined the transport of invertebrates and coarse organic detritus from headwater streams draining timber harvest units in a selective timber harvesting study, alternatives to clearcutting (ATC) in southeastern Alaska. Transport in 17 small streams (mean measured discharge range: 1.2 to 14.6 L/s) was sampled with 250- m-mesh drift nets in spring, summer, and fall near Hanus Bay at an ATC installation on Catherine and Baranof Islands. Samples were taken before (1996) and after (1999, 2000) nine timber harvesting treatments were applied. Invertebrate and organic detritus drift densities and community composition were used to assess treatment effects. A comparison of drift densities before and after treatment showed year-to-year differences comparable to natural variation at other sites in this study, but no clear relationship to intensity or type of timber harvest treatments. Natural variation in drift densities prevented detection of any potential timber harvesting effects. Coefficients of variation showed transport was most variable among streams, followed by seasons and then days. A trend toward an increase in the proportion of true flies (Diptera) and a decrease in the proportion of mayflies (Ephemeroptera) was seen in more intensive treatments. Although transport rates were extremely variable, a mean of 220 mg invertebrate dry mass and 18 g detritus per stream per day was being transported downstream. The transport of this material suggests that headwaters are potential source areas of aquatic and terrestrial invertebrates and detritus, linking upland ecosystems with habitats commonly fish bearing) lower in the catchment."

Notes:

Title from title screen (viewed on Apr. 9, 2008).

"April 2004."

Includes bibliographical references (pages 23-25).

Electronic reproduction. [Place of publication not identified] : HathiTrust Digital Library, 2010.

Other Format:

Print version: Musslewhite, Jake. Effects of alternatives to clearcutting on invertebrate and organic detritus transport from headwaters in southeastern Alaska.

OCLC:

55045431

Access Restriction:

Use copy Restrictions unspecified