31 |
A benthological investigation of Lake MichiganMerna, James William. January 1960 (has links)
Thesis (M.S.)--Michigan State University. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 58).
|
32 |
Estuarine sediment nutrient exchange : the importance of physical transport mechanisms and benthic micro-communities /Reay, William Glendon. January 1992 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 207-235). Also available via the Internet.
|
33 |
Systematics and ecology of the benthic ciliates of Point Mugu Lagoon, Southern CaliforniaSmith, Thomas Patrick. January 1981 (has links)
Thesis (Ph. D.)--University of Southern California, 1981. / Includes bibliographical references (leaves 228-251).
|
34 |
A study of the benthic algae in the kelp bed off Del Monte Beach, Monterey, CaliforniaKeithly, John Luther. January 1974 (has links)
Thesis (M.S.)--Naval Postgraduate School, 1974. / Includes bibliographical references (leaves 141-142).
|
35 |
The benthic macrofauna of the mainland shelf of Southern CaliforniaJones, Gilbert Fred. January 1973 (has links)
Thesis (Ph. D.)--University of Southern California, 1967. / Photocopy of: Los Angeles : University of Southern California, 1967. Includes bibliographical references (leaves 577-592).
|
36 |
Snail grazing effects on the composition and metabolism of benthic diatom communities and subsequent effects on fish growth /Connor, Michael Stewart. January 1980 (has links)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1980. / Supervised by John M. Teal. Vita. Includes bibliographical references.
|
37 |
Benz(a)anthracene in benthic marine environments : bioavailability, metabolism, and physiological effects on the polychaete Nereis virens /McElroy, Anne Elizabeth. January 1985 (has links)
Thesis (Ph. D.)--Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1985. / Bibliography: p. 218-234.
|
38 |
A quantitative comparison of meiofaunal distributions in an open sand area and a sea grass bed (Thalassia testudinum)Unknown Date (has links)
Thesis (M. S.) - Florida State University. / Bibliography: leaves 136-142.
|
39 |
The relationship between sediment composition and infaunal polychaete communities along the southern coast of NamibiaClarke, Dylan Thomas January 2005 (has links)
Magister Scientiae - MSc / This study examined the relationship between sediment structure and infaunal polychaete communities off the southern coast of Namibia from two separate sets of data, and a total of ninety-two samples. It also examined whether a selected group of organisms (polychaetes) could provide the same level of information regarding community structure, as the entire fauna, at a number of taxonomic resolutions. A total of 44 samples were collected by De Beers Marine (Pty) Ltd in 1999 off the southern coast of Luderitz from depths between 40 m and 90 m. The sediments varied from soft muds (45 μm) to gravel (> 710 μm). Forty-three morpho species of polychaetes were distinguished, of which only 28 known species of polychaetes could be positively identified, which suggests that more information on the diversity of polychaetes in the region is needed. The fauna was dominated by species in the Ampharetidae, Capitellidae,
Maldanidae, Spionidae, Lumbrineridae, Flabilligeridae, Nephtyidae, Pectinariidae and Onuphidae. Multi-variate analyses using PRIMER indicated that communities were
structured by mud (45 μm) and very fine sand (45 - 63 μm) and gravel (> 710 μm). Mud and gravel, although selected by the BIOENV procedure as accounting for some of the variation in the polychaete assemblage structure, explained no more of the data (in combination) than did mud on its own. As similar clustering of samples was observed when the data were analysed at both the family and species-level, suggesting that the same level of information was being gained at the two taxonomic levels. The results of the BIOENV analyses were also broadly similar for both taxonomic levels of analyses, in terms of both the proportion of the variation in assemblage structure explained by the
selected environmental variables and the choice of selected variables. These results suggested the information gathered at the polychaete family-level were equally clear when they are collected at the family-level for the entire infauna.
The use of polychaetes (to the family-level) as surrogates, using sediment structure and depth was independently investigated from a total of 48 samples that were collected by
De Beers Marine (Pty) Ltd in 2001, from depths between 20 m and 110 m. The sediment varied from mud (< 63 μm) to gravel (> 710 μm). Twenty-two families of polychaetes
were distinguished, the fauna showing an abundance of Capitellidae, Cirratulidae, Flabilligeridae, Lumbrineridae, Magelonidae, Nephtyidae, Paraonidae, Pilargiidae, Onuphidae, Syllidae and Spionidae. Striking differences were found in the amount of variation accounted for in the biological samples by the environmental data. Interestingly, depth in combination with a particular sediment size fraction featured very strongly in structuring both sets of communities. The biotic patterns in the family-level total infauna were not similar for the polychaetes (at the same taxonomic resolution). These results
suggested that one group of organisms (polychaetes at the family-level) may not be useful as a proxy for the entire infauna (at the family-level). Because of the contrasting results that were obtained in 1999 and 2001, the biological
data in 1999 were pooled and the environmental data (sediment size fractions) were adjusted accordingly (i.e. some of the differences in the results may reflect differences in the methods used to collect data). Consequently the results still did not adequately explain why there was a low level of similarity between the total infauna and polychaete
family-level biotic patterns in 2001. It seemed that pooled data improved the taxonomic resolution (amount of variation obtained), but when the sediment size fraction data were
adjusted, it lowered the amount of taxonomic resolution. The results suggest that comprehensive and standardized samples must be collected to fully understand the relationships between biotic patterns and environmental variables. This is potentially important given the costs involved and the potentially long lasting value of the material collected. These sediment and biological samples were collected by industry (for baseline biological monitoring in the mining industry, and not academic purposes). Proper protocols need to be established which allow industry-related monitoring programs to make a real contribution to our understanding of the biodiversity and ecology of the area. / South Africa
|
40 |
Comparison of the responses of benthic and planktonic communities to enrichment with inorganic fertilizersCameron, Roderick L. January 1973 (has links)
A comparison was made of the responses of benthic and planktonic components of natural water-sediment systems enriched with inorganic fertilizers. Three levels of fertilization
were applied to a series of enclosures placed in a shallow (1 m depth) area of Marion Lake, British Columbia
and community respiration, primary production, standing
algal crop and the distribution of added phosphorus were measured in both the sediment and the water column over a period of two years. A loss of added phosphorus from the water column corresponded
to an increase measured in the sediment. Uptake and release of phosphorus by the sediment was proportional to its concentration in the water column, indicating a water-sediment equilibrium. In an undisturbed system, however,
there was a net movement of phosphorus into the sediment
. A sustained high level of planktonic primary production persisted throughout the period of fertilization. However, an initial increase in total benthic primary production returned
to pre-fertilization levels following the establishment
of an increased standing crop of epipelic algae. At this point, benthic primary production appeared to be a function
of grazing pressure, responding to increased grazing but not to additional fertilization. When grazing was experimentally
increased by concentrating grazers in an experimental area,
benthic primary production increased. Fertilized sediment appeared to have a much greater ability to withstand increased
grazing pressure than normal sediment, maintaining high levels of primary production even at five times normal grazer density. But despite this potential, measurements of grazer and bacteria populations within the experimental enclosures showed no response to the greater standing crop of epipelic algae. As a result, sustained increase in benthic primary production could be induced only experiment-, ally. It was concluded that the benthic community was more stable in its response to enrichment than that of the plankton
and by absorbing nutrients from the water column served to dampen the effects of the more pronounced fluctuations of the planktonic community. / Science, Faculty of / Zoology, Department of / Graduate
|
Page generated in 0.0501 seconds