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.
Results
Showing 1 to 20 of 87 for “"Benthos"”.
-
Macroscopic Benthos Populations in A South Dakota Power Plant Cooling Reservoir
… seasonal variation, and entrainment of benthos were studied at the Big Stone Power Plant cooling reservoir. Benthos samples were collected from January 1979 through March 1980 utilizing a stratified random sampling design in 3 areas related to the thermal discharge site and cooling water …
-
Quantitative ecology reveals scale-dependent structural processes of the Antarctic benthos through time
Modern day benthic community composition and distribution in the Southern Ocean are influenced by a variety of environmental and evolutionary factors across different spatial scales. Depth, temperature, salinity, and sea ice impact community structure at large spatial scales (e.g., > 60 km). Far …
-
Spatial and temporal distribution of the benthos in the Mfolozi-Msunduzi Estuary, KwaZulu – Natal
… in 2009 to investigate seasonal patterns of the benthos of the system. Another aim of this study was to determine the benthic biomass of the Mfolozi – Msunduzi estuarine system. Results indicated that 23 taxa were recorded in 2009 with 18 and 15 taxa in the Mfolozi and Msunduzi Estuary, …
-
Macroscopic Benthos Populations and Taxonomy of the Family Chironomidae in Lake Poinsett, South Dakota
Benthos samples were collected in Lake Poinsett, a highly eutrophic eastern South Dakota lake, from March 1970 through February 1971. The lake bottom was divided into three substrate types (sand, sand-sapropel mixture and sapropel) and the percent of each substrate type was calculated. Nineteen …
-
Effects of Hydrological Connectivity on the Benthos of a Large River (Lower Mississippi River, USA)
The effects of hydrological connectivity between the Mississippi River main channel and adjacent secondary channel and floodplain habitats on macroinvertebrate community structure, water chemistry, and sediment makeup and chemistry are analyzed. In river-floodplain systems, connectivity between the …
-
Investigating the importance of different sources of organic matter as food for the benthos on three Arctic shelves
… crucial to<br/>understand what fuels the Arctic benthos, to understand how resilient it can be to these<br/>shifting food sources. Three Arctic shelves were studied: the Barents Sea, the Northeast<br/>Greenland Shelf, and the Beaufort Sea Shelf, representing the often-described …
-
The genetic structure of New Zealand's coastal benthos: using the estuarine clam Austrovenus stutchburyi, to determine rates of gene flow and population connectivity
… genetic structure of New Zealand’s coastal benthos with the aim of enhancing our understanding of population connectivity, as well as identifying physical and biological processes that might influence population genetic structure. The population genetic structure of New Zealand’s coastal …
-
Benthic and Planktonic Microalgal Community Structure and Primary Productivity in Lower Chesapeake Bay
… is understood, but the contribution of microphytobenthos remains unclear. This project surveys intertidal microphytobenthic communities, in relation to phytoplankton communities, around lower Chesapeake Bay describing the taxonomic makeup of these populations, coupled with quantification of cell …
-
Aquatic Macroinvertebrate Production in Predominant Habitats of a Warmwater Stream: The James River, South Dakota
… were much higher on snags than in rock or mud benthos. Mean annual densities of total macroinvertebrates ranged from 56,761 m2 on snags to 12,279 m2 in rock substrates. Abundant taxa varied among the three habitats. Glyptotendipes spp. (Chironomidae), Cyrne/lus .fraternus (frichoptera), and …
-
Use of demersal bycatch data to determine the distribution of soft-bottom assemblages off the West and South coasts of South Africa.
… biodiversity patterns of the offshore benthos around South Africa. Samples were collected as bycatch from demersal trawl surveys conducted along the South (one cruise) and West Coasts (two cruises).
-
An Investigation of the Relationships Between Stream Benthic Macroinvertebrate Assemblage Conditions and Their Stressors
… to evaluate the accuracy of the stressor/benthos relationships, and to discuss the implications of the study results for development of benthic TMDLs. A procedure to determine the relationships between stressors and benthic macroinvertebrate assemblage conditions was developed. Existing …
-
Assessment of predation by the West Coast rock lobster (Jasus lalandii) : relationships among growth rate, diet and benthic community composition, with implications for the survival of juvenile abalone (Haliotis midae)
… the influence of rock-lobster predation on the benthos, but more specifically on sea urchins and juvenile abalone.
-
Benthic Population Distributions in Red Rock Reservoir, Iowa Summer 1972
… the study three major groups comprised the benthos. Of the total numbers collected during the study Oligochaeta comprised 52.4%, Chironomidae 44.8% and Chaoborus 2.8%. Total mean numbers collected ranged from 24 to 212 organisms/m2. Thermal and chemical stratification of the bottom waters …
-
Studies on the macroinvertebrate bottom fauna of the Irwell, a polluted river
… from analysis of bi-monthly samples of riffle benthos from ten sites on the river show the fauna to be dominated by Oligochaeta, notably Limnodrilus hoffmeisteri. Using simple association analysis the fauna is divisible into three 'ecological assemblages'. One assemblage, association B, …
-
Functional anatomy of the Macrouridae (Teleostei, Gadiformes)
… the group. Macrourids that are predators on benthos tend to be small and live at depths shallower than 2000 meters.
-
Food Habits of Larval Ringed Salamanders, Ambystoma Annulatum
… The larvae fed mostly on plankton and added benthos to their diet as they grew larger. Also, larger larvae ate more prey items than smaller larvae and were able to feed on larger prey items. However, larger prey items were not frequently present in the diet and gape size did not explain much …
-
Habitat and Ecological Observations on Gymnodinium Acidotum Nygaard, a Colorless Dinoflagellate Phagocytizing Blue-Green Cryptophytes
… is normally associated with Spirogyra sp. in the benthos of shallow marshy areas frequented by waterfowl. Morphology and pigmentation vary in the natural environment according to water chemistry and the presence of cryptophytes. A short colorless phase, observed in vitro, consists of mononucleate …
-
Physiological and behavioral responses, and their variability, in squid, Doryteuthis pealeii, embryos and paralarvae reared under chronic ocean acidification
… web, and annually lays its eggs in the nearshore benthos during summer. This thesis sought to characterize morphological, physiological, and behavioral responses of D. pealeii embryos and paralarvae to OA. Experiments began in 2013, where I exposed squid eggs to a range of acidification levels …
Page 1 of 5