Zooplankton grazing and growth: Scaling within the 2‐2,‐μm body size range
- P. J. Hansen, P. K. Bjørnsen, B. Hansen
- Environmental Science
- 1 June 1997
The size dependency of grazing and growth rates in zooplankton, data collected from laboratory studies in the literature, covering both limnic and marinc organisms, found significant differences between groups, but the entire set of observations could not be fitted by an overall regression.
The size ratio between planktonic predators and their prey
- B. Hansen, P. K. Bjørnsen, P. J. Hansen
- Environmental Science
- 1 March 1994
The assumption of a fixed size ratio between pelagic predators and their prey is re-evaluate on the basis of data now available in the literature and several criteria may be involved in food selection.
Zooplankton grazing and growth: Scaling within the 2–2,000‐µm body size range
- P. J. Hansen, Peter Koefoed BjØrnsen, B. Hansen
- Environmental Science
- 1 December 2000
In order to study the size dependency of grazing and growth rates in zooplankton, data wcrc collected from laboratory studies in the literature, covering both limnic and marinc organisms. Data were…
Prey size selection, feeding rates and growth dynamics of heterotrophic dinoflagellates with special emphasis on Gyrodinium spirale
- P. J. Hansen
- Environmental Science
- 1 June 1992
Heterotrophic dinoflagellates have growth rates which are approximately three times lower than that of their potential competitors, the ciliates, and the ability to ingest relatively large prey may explain why these organisms are competitive in nature.
Effect of high pH on the growth and survival of marine phytoplankton: implications for species succession
- P. J. Hansen
- Environmental Science
- 24 July 2002
Ten years of pH measurements (1990 to 1999) in the surface waters of the eutrophic Mariager Fjord, Denmark, revealed profound seasonal variation. Typically, pH was relatively constant around 8 from…
Effect of pH on growth and domoic acid production by potentially toxic diatoms of the genera Pseudo-nitzschia and Nitzschia
- N. Lundholm, P. J. Hansen, Y. Kotaki
- Environmental Science
- 8 June 2004
A compilation of all available data on the pH limits for growth of marine planktonic diatoms suggests that species from ponds and rock pools all have higher limits than coastal and oceanic species, and smaller species have a higher upper pH limit for growth than larger species.
Prey size selection, grazing and growth response of the small heterotrophic dinoflagellate Gymnodinium sp. and the ciliate Balanion comatum--a comparative study
- H. Jakobsen, P. J. Hansen
- Environmental Science
- 17 November 1997
Prey selectivity, growth and feeding responses were studied in the cillate Balanion comaturn (17 pm) and the heterotroph~c dinoflagellate Gjmnodinium sp. (7 pm). Almost identical prey size spectra…
Allelopathy in the prymnesiophyte Chrysochromulina polylepis: effect of cell concentration, growth phase and pH
- Lisanna Schmidt, P. J. Hansen
- Environmental Science, Biology
- 6 July 2001
The role of cell concentration, growth phase, and pH in the ability of C. polylepis to immobilize the dinoflagellate H. triquetra cells was dependent on the pH of the growth medium, and the harmful effect on the tested algae was observed as an initial decrease in growth rate, followed by a decline in their population numbers.
The Role of Photosynthesis and Food Uptake for the Growth of Marine Mixotrophic Dinoflagellates 1
- P. J. Hansen
- Environmental ScienceJournal of Eukaryotic Microbiology
- 1 May 2011
Dinoflagellates, which form symbioses with endo‐ and ectosymbionts are a very heterogeneous group, which have been studied only sporadically, and some species are clearly primarily phototrophs, while others rely heavily on food uptake for growth.
Effects of high pH on the growth and survival of six marine heterotrophic protists
- M. F. Pedersen, P. J. Hansen
- Environmental Science
- 30 September 2003
The results suggest that such pH levels will kill many, but not all, heterotrophic protists, and may, at least temporarily, lead to a reduction in grazing control of such algal blooms, thereby further allowing their growth and persistence.
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