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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 11 to 20 of 861 (0.048 seconds)Spelling suggestions: "subject:"ecosystems"" "subject:"cosystems""
| 11 |
Variation in the erosion threshold of natural intertidal sedimentsGeorge, Christian Robert January 1994 (has links)
No description available.
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| 12 |
Interactions between fish, Mysis, and zooplankton in Lough NeaghKirkwood, Richard Christopher January 1996 (has links)
No description available.
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| 13 |
The role of food in determining the distribution and ecology of two species of freshwater hoglice, Asellus aquaticus (L.) and Proasellus meridianus (Rac)Peet, Sarah Loanda January 1992 (has links)
No description available.
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| 14 |
Monitoring and modelling rangeland vegetation in Tunisia using satellite and meteorological dataWellens, Jane January 1993 (has links)
No description available.
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| 15 |
The response and tolerance of wetland plants to sulphideSellars, Barbara January 1991 (has links)
No description available.
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| 16 |
Testing and developing protocols for the practical application of PHABSIM for instream flow and habitat assessmentTriggol, Anna January 2001 (has links)
No description available.
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| 17 |
The impact of agricultural practices on the aquatic invertebrate populations of ricefieldsSimpson, Ian Charles January 1992 (has links)
No description available.
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| 18 |
The creation and maintenance of spatial heterogeneity in plant communities : the role of plant-animal interactionsEdwards, Grant R. January 1994 (has links)
No description available.
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| 19 |
Soils, vegetation and herbivores in the Sabi-Sand Wildtuin, Transvaal, S.ABen-Shahar, Raphael January 1990 (has links)
No description available.
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| 20 |
Pollutant pressure effects on the diversity, stability and function of the soil microbial communityGirvan, Martina Susanna January 2000 (has links)
This study aims to investigate the link between genetic functioning and diversity, and to establish a relationship, if any, between that diversity and the stability of the community. Extreme transient perturbations were performed, using repeat chloroform fumigations, to reduce the community to its lowest genetic level (0.7% of the DNA of the control population). Severe reduction in community diversity and selection for bacilli was initially observed, the community subsequently recovered (6 months) to its previous diversity but was altered in community composition, bacilli were no longer dominant. Perturbations using benzene resulted in a reduced genetic diversity (16S rDNA and DGGE) which did not recover (after 4 weeks). However, full recovery was observed for culturable cell numbers, DNA concentration and community level physiological profile (Biolog)., suggesting high levels of genetic redundancy within soil. Investigation of the relationship between diversity and stability was performed by perturbing soils with naturally differing levels of diversity (Sourhope>Boyndie) to equivalent toxicity, using copper and benzene. Large decreases in biomass were observed for both soils after benzene perturbation. Assuming successful equivalent toxicity, the genetic diversity of the naturally more diverse soil was more resistant to benzene perturbation than the less diverse soil. The broad scale function of both benzene-treated soil communities was unaffected (14C-labelled wheat shoot mineralisation). Narrow niche function was impaired for both soils (14C-labelled 2,4-DCP mineralisation). The Sourhope soil recovered this function by the end of the experiment, but Boyndie did not. The genetic diversity of both soils was resistant to copper perturbation despite biomass decreases. Initial shifts in physiological profiles of both soils was observed but rapidly returned to that of the control. In conclusion, diversity-stability relationships may exist in soil communities, despite generally being an extremely robust system.
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