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Showing 1 to 13 of 13 for “"Benthic algal."”.
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Lake Benthic Algal Production and Extracellular Material
… its importance to the lake as a whole. Benthic extracellular material, shown to be important for food web dynamics and stabilization of the surrounding ecosystem in the marine intertidal, is even less frequently studied in lakes. I examined the environmental and community level drivers …
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Nutrient enrichment modulates the structure and temporal assembly of riverine benthic algal and macroinvertebrate assemblage.
… assembly of natural communities. By studying benthic algal and macroinvertebrate assemblages from 35 streams over two years that spanned a wide gradient of nutrient enrichment, I found that the temporal assembly patterns of both assemblages were heavily influenced by novel nutrient …
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Effect of Macrograzers (Campostoma spp. and Faxonius spp.) on Periphyton in Ozark Streams with Considerations Given to Macrograzer Biomass, Phosphorus, and Season: Mensurative and Manipulative Studies
<p>Nutrient and benthic algal biomass relationships can guide numeric nutrient criteria development in lotic systems. However, herbivorous macrograzers may confound this relationship by reducing the slope of the positive relationship between nutrients and periphyton biomass in streams. I conducted …
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Volatile organic compounds in seawater
… A source related to the transformation of the algal fatty acid, hexadecaugic acid, by zooplankton is proposed since anthropogenic and direct phytoplankton sources are unlikely. C2-alkylated benzenes were found in the upwelled water off Peru at about 4 ng/kg in the surface (5 and 20m), 3 ng/kg …
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The foraging strategy of Diadema antillarum (Philippi) (Echinodermata: Echinoidea)
… urchins have a strong feeding preference for algal turf. Seasonal variation in the abundance of this preferred food item results in increased incidences of live coral predation. Experimental manipulations demonstrate that over the short term food availability is more important than urchin …
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Ecology of acidification and recovery in Welsh upland streams
… acid deposition on the structure and function of benthic communities in streams of contrasting pH in mid-Wales, UK, and examines barriers to biological recovery across the sites. The results of field surveys across 30 streams revealed sustained effects of acid stress on macroinvertebrate …
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Snail grazing effects on the composition and metabolism of benthic diatom communities and subsequent effects on fish growth
… to untreated tanks. The standing stocks of algal pigments, respiration and photosynthesis were depressed in the microcosms which received the 12-snail or the raking treatments. Simulating snail excretion by fertilization with ammonium increased chlorophyll standing stock by a similar …
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The abundance and diversity patterns of seaweed communities on natural and artificial substrata at Sodwana Bay, South Africa
… by macroalgae. The nature and dynamics of this algal overgrowth are not well understood. This study was done on Two-Mile Reef, Sodwana Bay, located in the iSimangaliso Wetland Park, a World Heritage Site. The first aim was to investigate the abundance and diversity of benthic algal communities …
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An analysis of subtidal seaweed communities on a depth gradient at Sodwana Bay, on the KwaZulu-Natal coast, South Africa
… and biogeographical affinities of the marine benthic algal flora of this region. The newest leg of the project is focusing on correlating biogeographic patterns with abiotic factors in the area between the St. Lucia estuary and Sodwana Bay, where it has become evident that there is a huge …
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Organic Matter Processes of Constructed Streams and Associated Riparian Areas in the Coalfields of Southwest Virginia
… oxidized nitrogen concentrations, depressed benthic macroinvertebrate richness, and lower levels of canopy cover. Functionally, litterfall input and total leaf breakdown means for constructed streams were approximately 25% and 60% of reference means, respectively. Leaf breakdown in …
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Investigation of the distribution, structure, composition, development and primary productivity of blue-green algal mat communities in an Antarctic lake
Benthic blue-green algal mats in Lake Bonney, South Victoria-land, Antarctica, were investigated during the 1972-73, 1973-74 and 1974-75 austral summers. This investigation included (1) the distribution, structure, biological and chemical composition, and (2) measurements of photosynthesis, …
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Load reduction and invasive mussel effects on eutrophication dynamics in Saginaw Bay, Lake Huron
… invasion, cyanobacterial blooms and nuisance benthic algal growth have reappeared in many nearshore areas of the Great Lakes.</p><p>This dissertation characterizes long-term patterns of phosphorus loading and mussel populations for Saginaw Bay, and estimates the effects of load reductions and …