J. Ramus

Publications46
h-index28
Citations2,424
Highly Influential Citations85
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Ecological growth strategies in the seaweeds Gracilaria foliifera (Rhodophyceae) and Ulva sp. (Chlorophyceae): Soluble nitrogen and reserve carbohydrates
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… Expand
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Uptake of inorganic nitrogen and seaweed surface area: Volume ratios
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… Expand
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Photoacclimation and photoinhibition in Ulva rotundata as influenced by nitrogen availability
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… Expand
  • 158
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THE PRODUCTION OF EXTRACELLULAR POLYSACCHARIDE BY THE UNICELLULAR RED ALGA PORPHYRIDIUM AERUGINEUM 1, 2
The unicellular red alga Porphyridium aerugineum was shown to be encapsulated by an amorphous, water‐soluble, polyanionic polysaccharide of high molecular weight. The encapsulating polysaccharide is… Expand
  • 167
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Effect of temperature on nitrogen-limited growth rate and chemical composition of Ulva curvata (Ulvales: Chlorophyta)
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… Expand
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GROWTH OF THE GREEN ALGA CODIUM FRAGILE IN A CONNECTICUT ESTUARY 1
An in situ comparison of environmental and physiological factors was undertaken in 1971–72 (15 months) in the Niantic River estuary to elucidate some of the important aspects, of the growth and… Expand
  • 53
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SEAWEED ANATOMY AND PHOTOSYNTHETIC PERFORMANCE: THE ECOLOGICAL SIGNIFICANCE OF LIGHT GUIGES, HETEROGENEOUS ABSORPTION AND MULTIPLE SCATTER 1 2
Light absorption by two green seaweeds with similar photophysiology but different anatomies are compared: i) Ulva lactuca var. rigida (C. Ag.) Le Jolis, an optically translucent species of two cell… Expand
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Seasonal niche strategy of the bloom-forming dinoflagellate Heterocapsa triquetra
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… Expand
  • 69
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Ecological Growth Strategies in the Seaweeds Gracilaria foliifera (Rhodophyceae) and Ulva sp. (Chlorophyceae): Photosynthesis and Antenna Composition
Observations have been made on photosynthesis (oxygen evolution) and seasonal fluctuations in antenna pigments in 2 seaweeds which CO-occur in the vicinity of Beaufort, North Carolina, USA.… Expand
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Diurnal photosynthetic performance of seaweeds measured under natural conditions
Statements comparing photosynthetic performance characteristics of species rely upon empirical data, usually light-saturation curves (photosynthesis, P, versus incidentlight flux-density, Io,… Expand
  • 87
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