Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Species number"”.
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The Relationship of Small Mammal Species to Habitat Variables in West-Central Georgia and East-Central Alabama
… of environmental variables upon small mammal species distribution in 60 plots on Fort Benning, Muscogee and Chattahoochee Counties, Georgia and Russell County, Alabama. The small mammal fieldwork was carried out in December of 1994 through January of 1995. The vegetation was inventoried in …
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The dynamics of enzymatic switch cascades
… transfer with respect to reaction velocity and species number parameters, and observe the dynamical memory-gain and memory-loss as well as decay in mutual information in quadruple-linked switch systems.
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ΒΙΟΝΟΜΙΚΗ ΜΕΛΕΤΗ ΤΩΝ ΘΑΛΑΣΣΙΩΝ ΑΝΕΜΩΝΩΝ (ACTINIARIA, ANTHOZOA) ΤΟΥ ΘΕΡΜΑΙΚΟΥ ΚΟΛΠΟΥ
… IN THERMAIKOS GULF REVEALED THE PRESENCE OF 15 SPECIESOF SEA ANEMONES. NINE OF THE FIFTEEN SPECIES FOUND, ARE REPORTED FOR THE FIRSTTIME FROM THE EASTERN MEDITERRANEAN AND ONE FROM THE AEGEAN SEA. ACCORDING TO THE SELECTIVE PREFERENCE SHOWED BY THE VARIOUS ANEMONE SPECIES TO VARIOUS TYPESOF …
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Relations between forest and prairie fragmentation and depredation of artificial nests in Missouri
… of diversity, the mechanisms that determine species composition, and ways of preserving the existing flora and fauna within the remaining areas. Principles derived from island biogeography offer possibilities for conserving species in fragmented habitats. MacArthur and Wilson (1967) proposed …
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Patterns of microbial community development in isolated aquatic systems
… (170 day) experiments suggest that no protracted species equilibrium is achieved in these systems; an initial asymptotic increase in species richness was followed by large oscillations in the number of species. There was no correlation between rates of species colonization and the number of …
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Seasonal population levels, breeding and hunting of waterfowl on the New River, Virginia
… censused by canoe 33 times over a 1 year period. Species and number of waterfowl were recorded for each operation. A total of 16 species were observed, including 8 species of diving ducks, 7 species of dabbling ducks and 1 species of goose. Species diversity was highest in February and March and …
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Breeding bird populations in relation to the vegetation structure of abandoned contour mines in Southwest Virginia
… was employed to census bird populations. The number of breeding species, number of breeding pairs, bird species diversity, and number of observed species (breeding or visiting) were determined for each disturbed area, the marginal undisturbed forest, and each total study area (marginal and …
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Biodiversity effects on the performance of terrestrial plant and phytoplankton communities
Die Ökosysteme unserer Erde sind durch das rasante Artensterben infolge von Umweltveränderungen durch den Menschen und des globalen Klimawandels stark betroffen. Mit den Auswirkungen dieses Artenverlustes und der damit einhergehenden Veränderung der Diversität beschäftigt sich die heutige …
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Stream aufwuchs accumulation
… age and to be greater in HSS than in LSS. Diatom species and diversity were greater in LSS than in HSS. In Stroubles Creek I tested the effect 6f five factors on the Aufwuchs accumulation process and found biomass accumulation was greater in summer than in fall, in riffles than in pools, and in …
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An investigation into the ecology and biogeography of subtidal seaweed communities of KwaZulu-Natal
… between 1 and 30 m deep. Each sample comprised a number of25 x 25 cm quadrats [usually five] that were scraped off hard substrata. A number of easily measured environmental variables were recorded for each quadrat. These were correlated against the biological findings to investigate the effects on …
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Resurvey of a GLORIA Target Region in the Swiss National Park
… the first (2002/03) and second survey in plant species number, species frequency and in heterogeneity between plots. Furthermore, is altitude, cardinal direction and bedrock influencing changes or are there species groups reacting different and what are the reasons behind it? In total 226 …
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Leaf litter ant communities in tropical lowland rain forests in Sabah, Malaysia
… In logged over forests, only 70 per cent of the species of a primary forest were present even 25 years after timber extraction. The ant communities were thinned and could be described by a lower species density producing lower species numbers and a different community composition. The similarity …
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Evaluation of the joint performance estimates within the PDS durability procedure
… pallet deck. The pallets tested varied by lumber species, number of fastener couples, and fastener stiffness as measured by the MIBANT bend angle. The observed affect of changes in fastener stiffness on pallet diagonal rigidity was found to be accurately reflected in the computed F(2) values. The …
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Effect of salinity and environmental changes on the fish community of the St Lucia Estuarine System with focus on the salinity tolerance of Oreochromis mossambicus (Mozambique Tilapia)
… conditions which greatly reduced marine fish species diversity. Regardless of this, the freshwater tilapia, Oreochromis mossambicus has been found in abundance in all parts of the system. This indicates that O. mossambicus is capable of surviving hypersaline conditions when no other fish …
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Systematics and evolutionary biology of the Weevils associated with cycads in Australia
… four genera and approximately 90 named species. Weevils play significant roles in pollination of Australian cycads, although some species are also pollinated or co-pollinated by some genera and species of the beetle families Boganiidae and Erotylidae and thrips. While it is now …
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Systematics and evolutionary biology of the Weevils associated with cycads in Australia
… four genera and approximately 90 named species. Weevils play significant roles in pollination of Australian cycads, although some species are also pollinated or co-pollinated by some genera and species of the beetle families Boganiidae and Erotylidae and thrips. While it is now …
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The phylogeny, morphological evolution and biogeography of the Gaultherieae (Ericaceae).
… Tepuia Camp., with a total of approximately 250 species. The tribe is defined by its four-appendaged anthers and a base chromosome number of 11, although both of these characters also occur in a closely related genus, Zenobia D. Don (tribe Andromedeae; Kron et al. 2002). The group exhibits an …
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How availability and quality of nectar and honeydew shape an Australian rainforest ant community
… a minority of floral visitors. In total, 43 ant species were observed to consume nectar from extrafloral nectaries (34 plant species) or from flowers (14 plant species), and wound sap exudates (three plant species). Six nectar-foraging ant species attended trophobionts (including at least 12 …
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Ecology of Lake District ostracoda
… taken from all 75 sites and yielded 31 ostracod species, of which 8 were new to the Lake District fauna. The collection of multiple littoral samples from two sites demonstrated that a single sample produced an adequate faunal representation if it encompassed a variety of microhabitats. …
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Marine alien species of South Africa : threats and opportunities
… and status of three intertidal alien species (Mytilus galloprovineialis, Care in us maenas and Careinus aestuarii) and documented the presence and status of a previously unknown invasive, the Japanese oyster, Crassostrea gigas. M galloprovincialis was recorded along the entire west …