Marine diatoms grown in chemostats under silicate or ammonium limitation. IV. Transient response of Chaetoceros debilis, Skeletonema costatum, and Thalassiosira ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1977-09

AUTHORS

H. L. Conway, P. J. Harrison

ABSTRACT

The kinetic response of ammonium- or silicate-limited and ammonium- or silicatestarved populations of Chaetoceros debilis, Skeletonema costatum, and Thalassiosira gravida was determined by a single addition of the limiting nutrient to a steady-state culture and subsequent monitoring of the nutrient disappearance of the limiting and non-limiting nutrients at frequent time intervals. The kinetic response of nonlimited (nutrient) populations of these three species was also determined. Three distinct modes of the uptake of the limiting nutrient were observed for ammonium-or silicate-limited populations of these three species, surge uptake (Vs), internally (cellular) controlled uptake (Vi), and externally (ambient limiting nutrient concentration) controlled uptake (Ve). Non-limited populations did not exhibit the three distinct segments of uptake, Vs, Vi and Ve. Estimates of the maximal uptake rate (Vmax) and the Michaelis constant (Ks) were obtained from nutrient-limited populations during the Ve segment of the uptake curve. Pooled values of Ve for the three ammonium-limited populations yielded Vmax and Ks estimates of 0.16 h-1 and 0.5 μg-at NH4−N l-1. Kinetic data derived from the Ve segment of the uptake curve for silicate-limited populations yielded different values of Vmax and Ks for each of the three species. In a number of parameters that were measured, T. gravida was clearly different from C. debilis and S. costatum and its recovery from nutrient starvation was the slowest. Recovery of all species from silicate limitation or starvation was slower than from ammonium limitation or starvation. Ammonium-starved populations maintained a maximal uptake rate at a substrate concentration an order of magnitude lower (≈0.1 μg-at NH4−N l-1) than that observed for NH4-limited populations (≈1.0 μg-at NH4−N l-1). Adaptation to the severity of the nutrient limitation occurred as changes in the magnitude of cellular characteristics, such as short-term uptake potential (Vs) and affinity for the substrate (Ks). The consequence of these results are discussed in terms of another possible mechanism to explain changes in species composition and succession in nutrient-depleted environments. More... »

PAGES

33-43

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00392569

DOI

http://dx.doi.org/10.1007/bf00392569

DIMENSIONS

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