English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Carbon flow into major end-products of photosynthesis in ultraphytoplankton from the deep chlorophyll maximum layer of the oligotrophic eastern Mediterranean Sea.

Rai, H., & Dockal, N. (1999). Carbon flow into major end-products of photosynthesis in ultraphytoplankton from the deep chlorophyll maximum layer of the oligotrophic eastern Mediterranean Sea. New vistas in aquatic microbial ecology, 147-166.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-E102-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-E103-D
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Rai, Hakumat1, Author              
Dockal, Norbert2, Author              
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976549              

Content

show
hide
Free keywords: -
 Abstract: Patterns in lipid, carbohydrate, and protein production and the photosynthetic parameters describing their production were determined for ultra-phytoplankton communities of deep chlorophyll maxima (DCM) from the eastern Mediterranean Sea. There were strong similarities in the photosynthetic characteristics of the DCM of the eastern Mediterranean and DCM of other oligotrophic freshwater and marine systems. Pmax of DCM at different stations varied between 1.1-7.8 109g C (μg Chl-a)⁻¹ h⁻¹ (mean = 2.47; S.D. 0±2.05). Light utilization efficiency (a) was high and varied between 0.015-0.116 109g C (μg Chl-a)⁻¹ h⁻¹ (μmol quanta m⁻²s⁻¹)⁻¹, (mean 0.036; S.D. = ± 0.03). Estimates of lk from this study fall within the range of 48-139 μmol m⁻²s⁻¹. These values of Ik are consistent with published estimates (50-150 μmol m⁻²s⁻¹) from different freshwater and marine environments. In this study lk estimates indicate that DCM ultraphytoplankton communities are adapted to low light. Artificially irradiated DCM communities were susceptible to photoinhibition, however, the photoinhibition parameters exhibited great variability (mean = 1.13 × 10⁻³; range 2.89 × 10⁻⁴ to 3.0 × 10⁻³ μg C (μg Chl-a)⁻¹h⁻¹ (μmol m⁻²s⁻¹)⁻¹. Most of the ¹⁴C was incorporated into polysaccharide (range = 38-72%; mean = 55%; C.V. = 8.7%), with lowest amounts incorporated into protein (range = 12-23%; mean = 17%; C.V. = 11.3%). Percentage of carbon fixation into lipid (LIP-FCF) varied between 16-44% (mean = 23.7%; CV = 18.1%). In contrast to previous marine literature which has shown an increase in algal lipids when either P or N is exhausted, or results indicate no such relationship. This discrepancy may be due to different algae, which may exhibit different physiological responses. Further, this study shows that nutrient deficiency does not affect the LIP-FCF in natural populations of the DCM from the eastern Mediterranean Sea.

Details

show
hide
Language(s): eng - English
 Dates: 1999
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 121447
Other: 1763/S 37408
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: New vistas in aquatic microbial ecology
Source Genre: Issue
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 147 - 166 Identifier: ISBN: 3-510-47056-7

Source 2

show
hide
Title: Archiv für Hydrobiologie, Advances in Limnology
  Alternative Title : Arch. Hydrobiol. Spec. Issues Advanc. Limnol.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 54 Sequence Number: - Start / End Page: - Identifier: ISSN: 0071-1128