Author : Susan J. Nichols
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Book Synopsis Biological Assessment of River Health Using Macroinvertebrates by : Susan J. Nichols
Download or read book Biological Assessment of River Health Using Macroinvertebrates written by Susan J. Nichols and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aquatic macroinvertebrates are commonly used biological indicators for assessing the health of freshwater resources. Compared to traditional methods, 'rapid' biological assessment methods provide a quicker turn-around of results, reduced costs and more easily interpreted results. The assumption underpinning many biological assessment methods is that the resulting macroinvertebrate sample is representative of the site at the scale to be assessed while still fulfilling the 'rapid' criteria of the bioassessment process. Complete enumeration of the invertebrates in the large samples that are usually collected is time consuming and costly, and would negate one of the 'rapid' components of bioassessment. Therefore, sub-sampling is often done by fixed time/count live-picking in the field or with preserved material using sample splitters in the laboratory. These methods are commonly used in conjunction with AUSRIVAS predictive models as part of Australia's National River Health Program. The macroinvertebrate sub-sample is expected to be adequate for assessing a site adequately in comparison to reference sites. This study examined the effects of sampling area, replication and sub-sampling methods on biological assessment results.