<p>The aim of the study was to examine if the benthos in a restored portion of a small lowland stream south of Linkoping differed from two non</p><p>restored reference areas two years after restoration. The reference areas were one stretch downstream and one upstream stretches of the restored</p><p>stream. The benthic invertebrates were collected using standardized kick sampling. In order to classify the communities and estimate any</p><p>differences, three different indices were exercised. In addition rank-abundance curves and checklists were used to get a picture of species</p><p>composition. The only index that showed a difference between areas was the Berger-Parker diversity index showing that the downstream reference</p><p>stretch differed from the other two. None of the analyses showed that the restored area was different from the other two, probably due to too short</p><p>a time since the restoration. To allow for the bottom substrate to develop and stabilize so that species can re-colonize the area.</p>

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In 2008 an initial benthic habitat map was completed by the contractor Avineon, Inc. The National Park Service South Florida / Caribbean Network (SFCN) conducted an accuracy assessment of the map and found the overall habitat identification to be acceptable. However, upon further inspection, the soft-bottom habitat classifications displayed a relatively high level of accuracy, while the hard-bottom habitats were below an acceptable level. With the acquisition of new higher resolution side scan sonar data and 2054 field data points from multiple sources, the 2008 map was revised and improved by utilizing these new data sets to produce the 2010 Dry Tortugas benthic habitat map. The 2010 Dry Tortugas benthic habitat map was developed using 13 mapping classes and 1709 polygons totaling an area of 26,229 hectares. All “Unknown” areas (10,444 hectares) in the 2008 map were identified, the line work for the hard-bottom areas was fine-tuned and a mapping layer was developed showing those areas which have a higher potential for fish and benthic biodiversity. In addition, a final bathymetry layer for the park was developed by merging the existing light detection and ranging (LiDAR) and newly acquired side scan sonar/bathymetry data. The current management plan for the Dry Tortugas National Park (DRTO) marine areas focuses much of its effort on the Research Natural Area (RNA). The intensive amount of research effort placed on the RNA has also accomplished the research needed for the rest of DRTO because current research and monitoring efforts are split equally between areas of the DRTO that fall within and outside the RNA to make for a balanced comparative study design. In February of 2007, National Park Service (NPS) and Florida Fish and Wildlife Conservation Commission (FWC) developed a science plan to assess conservation effectiveness for the RNA in conjunction with the rest of DRTO and the two nearby existing marine reserves. The implementation of the science plan has been accomplished through collaboration and cooperation of federal and state agencies, academic scientists, and NPS. The new benthic habitat map and corresponding products will help in showing what types of marine habitats are located in the Dry Tortugas National Park and provide the ability to track whether management interventions are effectively protecting the environment and associated resources.

Thesis (doctoral)--Universität Bremen, 2004. / Includes bibliographical references (p. 145-159).

Iron mining began in Wawa, Ontario in the late 1800s and ceased in 1998. The sintering process of iron pyrite produced sulfur dioxide which led to the acidification of nearby lakes. Benthic macroinvertebrate samples were collected from lakes along a gradient of historical impairment in Wawa to examine the extent to which the benthos of the lakes would separate along the historical impairment gradient. The results show that the lakes are not separated along a gradient of impairment, and acid-intolerant taxa were collected in previously acidified lakes. There was no ameliorative intervention to combat the historical acidification and the observed recovery of water chemistry and benthos is entirely due to natural ecosystem processes. The two sampling methods (littoral kick sampling using a D-net and Hester-Dendy substrates) used to sample the benthos in these lakes can lead to substantial differences in the taxa collected.