Joseph S. Ramus

Journal Article Journal of Coastal Research · January 1, 2007 The seasonal variations of water quality parameters as nitrite plus nitrate (NOx-), total phosphate (PO43-), chlorophyll a (chl a), and dissolved oxygen (DO) are analyzed across the Croatan-Roanoke-Albemarle-Pamlico-Core Sounds estuarine system (CAPES). Ov ... Full text Cite

Ecological response to hurricane events in the Pamlico Sound system, North Carolina, and implications for assessment and management in a regime of increased frequency

Journal Article Estuaries and Coasts · January 1, 2006 Since the mid 1990s, the Atlantic and Gulf Coast regions have experienced a dramatic increase in the number of hurricane landfalls. In eastern North Carolina alone, eight hurricanes have affected the coast in the past 9 years. These storms have exhibited i ... Full text Cite

Ferry-based monitoring of surface water quality in North Carolina estuaries

Journal Article Estuaries · 2003 Several interrelated factors affect water quality in the Albemarle-Pamlico Estuarine System (APES) including land use change in the upland and coastal watersheds, legislatively mandated basin-wide nutrient management plans, intense storms, and global and l ... Cite

Phytoplankton Forcing by a Record Freshwater Discharge Event into a Large Lagoonal Estuary

Journal Article Estuaries · 2003 We report here the response of the water column and phytoplankton biomass of a large lagoonal estuary to a record freshwater discharge event which followed from extraordinary hurricane activity. In the fall of 1999, three hurricanes passed over eastern Nor ... Cite

Effect of diel and interday variations in light on the cell division pattern and in situ growth rates of the bloom-forming dinoflagellate Heterocapsa triquetra

Journal Article Marine Ecology Progress Series · 2002 Heterocapsa triquetra is an important bloom-forming dinoflagellate found in estuaries and nearshore regions worldwide. In an initial time-intensive study, the shallow, tidally mixed Newport River estuary, North Carolina, USA, was sampled from a fixed point ... Cite

Seasonal niche strategy of the bloom-forming dinoflagellate Heterocapsa triquetra

Journal Article Marine Ecology Progress Series · 2002 Heterocapsa triquetra is one of the most common bloom-forming dinoflagellates found in estuaries and near shore regions around the world. This work examined the environmental factors associated with 3 separate wintertime H. triquetra blooms in the shallow ... Cite

Ecosystem impacts of three sequential hurricanes (Dennis, Floyd, and Irene) on the United States' largest lagoonal estuary, Pamlico Sound, NC.

Journal Article Proceedings of the National Academy of Sciences of the United States of America · May 2001 Three sequential hurricanes, Dennis, Floyd, and Irene, affected coastal North Carolina in September and October 1999. These hurricanes inundated the region with up to 1 m of rainfall, causing 50- to 500-year flooding in the watershed of the Pamlico Sound, ... Full text Cite

Short-term environmental variability and phytoplankton abundance in a shallow tidal estuary. II. Spring and fall

Journal Article Marine Ecology Progress Series · 1993 In spring, the estuary was in transition from riverine to lagoonal condition. Temperatures rose steadily (22 to 28°C), salinities (23 to 35‰) and chl a biomass (22 μg l-1) were high, and dissolved inorganic nitrogen (DIN) low (0.13 μM). Growth-limiting N w ... Cite

Fluorescence quenching during photosynthesis and photoinhibition of Ulva rotundata blid.

Journal Article Planta · 1993 The relationships between photoinhibition and photoprotection in high and low-light-grown Ulva were examined by a combination of chlorophyll-fluorescence-monitoring techniques. Tissues were exposed to a computer-controlled sequence of 5-min exposures to re ... Full text Cite

Photosynthetic response of Ulva rotundata to light and temperature during emersion on an intertidal sand flat

Journal Article Oecologia · 1992 We have investigated the diurnal response of photosynthesis and variable photosystem II (PSII) chlorophyll fluorescence at 77 K for thalli of the chlorophyte macroalga, Ulva rotundata, grown in outdoor culture and transplanted to an intertidal sand flat in ... Full text Cite

Two components of onset and recovery during photoinhibition of Ulva rotundata

Journal Article Planta · 1992 Short-term (up to 5 h) transfers of shade-adapted (100 μmol · m-2 · s-1) clonal tissue of the marine macroalga Ulva rotundata Blid. (Chlorophyta) to higher irradiances (1700, 850, and 350 μmol · m-2 · s-1) led to photoinhibition of room-temperature chlorop ... Full text Cite

Photosynthetic performance of deep-water macroalgae (Phaeophyta, Dictyotales) off Bermuda

Journal Article Hydrobiologia · 1992 Photosynthetic performance and dark respiration rates were determined in situ for abundant macroalgae occurring between 27-49 m depths off Bermuda. Brown algae, particularly members of the order Dictyotales, predominated at all deep-water sites, and Stypop ... Full text Cite

Diurnal responses of photosynthesis and fluorescence in Ulva rotundata acclimated to sun and shade in outdoor culture

Journal Article Marine Ecology Progress Series · 1991 Thalli of Ulva rotundata were acclimated to sun (100% Io) and shade (9% Io) in outdoor tumble tanks under nutrient-sufficient conditions. Diurnal patterns were determined for areal photosynthetic O2 exchange capacity (Pm) and quantum yield, respiration (Rd ... Cite

Photoacclimation and photoinhibition in Ulva rotundata as influenced by nitrogen availability

Journal Article Planta · 1991 Clonal tissue of the marine chlorophyte macroalga, Ulva rotundata Blid., was transferred from 100 to 1700 μmol photons · m-2 · s-1 under limiting (1.5 μM NH4+maximum, N/P=2) and sufficient (15 μM NH4+maximum, N/P=20) nitrogen supply at 18° C and 11 h light ... Full text Cite

A form-function analysis of photon capture for seaweeds

Journal Article Hydrobiologia · 1990 The ecological significance of photoadaptation and photoacclimation is at best inferential. This is attributed to two factors: 1) The dimensions of light absorption by multicellular tissues are inadequately described by theory, which is confounded by the i ... Full text Cite

Shear degradation as a probe of microalgal exopolymer structure and rheological properties

Journal Article Biotechnology and Bioengineering · 1989 The bulk rheological properties of exopolymers produced by three species of microalgae are destroyed by shear stress. The properties are drag reduction in capillary pressure flow and low shear rate viscosity. As such, shear stress constitutes an experiment ... Cite

Photoacclimation of Ulva rotundata (Chlorophyta) under natural irradiance

Journal Article Marine Biology · 1989 Two vegetative clones (designated 11/85 and 7/86 in accordance with month/year of collection) of the green macroalga Ulva rotundata were collected in the vicinity of Beaufort, North Carolina, USA. Each was grown in an outdoor continuous-flow system in summ ... Full text Cite

Optimization of pigment content and the limits of photoacclimation for Ulva rotundata (Chlorophyta)

Journal Article Marine Biology · 1989 Two vegetative clones (designated 11/85 and 7/86 in accordance with month/year of collection) of the chlorophyte macroalga Ulva rotundata were collected in the vicinity of Beaufort, North Carolina, USA. Each was grown in an outdoor continuous-flow system i ... Full text Cite

Effects of temperature, nitrogen supply, and tissue nitrogen on ammonium uptake rates of the chlorophyte seaweeds Ulva curvata and Codium decorticatum

Journal Article Journal of Phycology · 1989 N uptake rates of U. curvata were inversely correlated with tissue N and affected only slightly by temperature. There was no correlation of N uptake rate with tissue N in C. decorticatum. N uptake rates of C. decorticatum were affected by temperature but t ... Cite

Effect of temperature on nitrogen-limited growth rate and chemical composition of Ulva curvata (Ulvales: Chlorophyta)

Journal Article Marine Biology · 1989 Ulva curvata (Kutz.) de Toni growing in shallow estuaries experiences a highly variable supply of dissolved inorganic N, which can limit growth rates. The effects of N supply variability and annual temperature and light variation on growth rates and chemic ... Full text Cite

Community oxygen metabolism in a shallow tidal estuary

Journal Article Estuarine, Coastal and Shelf Science · 1988 Comprehensive sampling of a shallow tidal estuary was performed hourly for 14 days, at three-month intervals throughout the annual temperature cycle. The project took place in the Newport River estuary located inside the Outer Banks of North Carolina, U.S. ... Cite

Abundances and physiological properties of deep-water seaweeds from Carolina outer continental shelf

Journal Article Journal of Experimental Marine Biology and Ecology · 1988 The morphology, physiology, and relative abundances of two deep-water seaweed assemblages off Cape Fear, North Carolina, were examined, one at 30 m and the other at 42 m depth. Both sites are subtropical areas of low physical disturbance. In situ O2-exchan ... Cite

Short-term environmental variability and phytoplankton abundance in a shallow tidal estuary - I. Winter and summer

Journal Article Marine Biology · 1987 Fixed-point sampling of a shallow tidal estuary was performed hourly for 14 d in summer of 1982 and again in winter of 1983. This sampling regime was of statistically appropriate duration to allow characterization of the variability between periods of 2 to ... Full text Cite

Seasonal variation in RuBPcase activity and N allocation in the chlorophyte seaweeds ulva curvata (kutz.) de toni and Codium decorticatum (Woodw.) Howe

Journal Article Journal of Experimental Marine Biology and Ecology · 1987 Seasonal variation in ribulosebisphosphate carboxylase (RuBPCase) activity and cellular N allocation in Ulva curvata (Kutz.) De Toni and Codium decorticatum (Woodw.) Howe was followed over two annual cycles. Because apparent seasonal variation may result f ... Cite

Uptake of inorganic nitrogen and seaweed surface area: Volume ratios

Journal Article Aquatic Botany · 1984 Surge uptake of ammonium and nitrate by four intertidal seaweed species was examined under standard conditions (16.5 or 20°C, 72 μE m-2 s-1), at both subsaturating and saturating initial nutrient concentrations. Uptake rates were positively correlated with ... Cite

Ecological growth strategies in the seaweeds Gracilaria foliifera (Rhodophyceae) and Ulva sp. (Chlorophyceae): Soluble nitrogen and reserve carbohydrates

Journal Article Marine Biology · 1982 The seaweeds Gracilaria foliifera (Rhodophyceae) and Ulva sp. (Chlorophyceae) were grown in an outdoor continuous-flow system at both ambient incident light (I0) and 0.13 I0. During the winter, both species accumulated substantial soluble nitrogen reserves ... Full text Cite

Diurnal photosynthetic performance of seaweeds measured under natural conditions

Journal Article Marine Biology · 1980 Statements comparing photosynthetic performance characteristics of species rely upon empirical data, usually light-saturation curves (photosynthesis, P, versus incidentlight flux-density, Io, relationships) derived from instantaneous measurements. The spec ... Full text Cite

Adaptation of light-harvesting pigments to downwelling light and the consequent photosynthetic performance of the eulittoral rockweeds Ascophyllum nodosum and Fucus vesiculosus

Journal Article Marine Biology · 1977 We compared the effect of habitat and water depth on the light-harvesting pigment content for Ascophyllum nodosum and Fucus vesiculosus at two near-shore stations in Long Island Sound (USA). Excised pieces of seaweeds were attached at depth intervals to a ... Full text Cite

Correlation of changes in pigment content with photosynthetic capacity of seaweeds as a function of water depth

Journal Article Marine Biology · 1976 We conducted a study of the relationship between changes in photosynthetic pigment content and photosynthetic capacity as a function of water depth in Great Harbor near Woods Hole, Massachusetts, USA, on the green algae Ulva lactuca and Codium fragile and ... Full text Cite

Changes in photosynthetic pigment concentration in seaweeds as a function of water depth

Journal Article Marine Biology · 1976 We conducted a study of the relationship between changes in photosynthetic pigment content and water depth in Great Harbor near Woods Hole, Massachusetts, USA, on the green algae Ulva lactuca and Codium fragile and the red algae Porphyra umbilicalis and Ch ... Full text Cite

Primary-Production measurements for the green seaweed Codium fragile in long island sound

Journal Article Marine Biology · 1973 Rates of primary production and compensation depths were determined for Codium fragile by 3 different measurements: (1) growth rate; (2) rate of 14C-fixation; (3) rate of O2 evolution. The radiocarbon assay employed liquid scintillation counting of homogen ... Full text Cite

Incorporation of sulfate into the capsular polysaccharide of the red alga Porphyridium.

Journal Article Journal of Cell Biology · 1972 Cite

Analysis of blue-green and red algal ribosomal-RNAs by gel electrophoresis

Journal Article Archiv für Mikrobiologie · 1971 Ribosomal-RNAs of two species of red algae (Porphyridium aerugineum and Griffithsia pacifica) and a blue-green alga (Phormidium persicinium) were examined by the method of polycrylamide gel electrophoresis. The results of this study indicate that red algal ... Full text Cite

Dimorphic pit connections in red alga Pseudogloiophloea.

Journal Article Journal of Cell Biology · 1969 Cite