Effects of prey abundance and light intensity on nutrition of a mixotrophic flagellate and its competitive relationship with an obligate heterotroph
(2004) In Aquatic Microbial Ecology 36(3). p.247-256- Abstract
- The mixotroph Poterioochromonas malhamensis was grown in batch and semicontinuous cultures in order to examine the dependence of phagotrophy versus phototrophy at bacterial densities similar to those found in oligo- and mesotrophic lakes in combination with differing light regimes. In addition, the growth rates and biomass accumulation of the mixotroph were compared to those of the heterotroph Spumella elongata grown under similar conditions. In P. malhamensis, primary production rates and cell-specific chlorophyll a concentrations were significantly higher when grown at low bacterial densities, and the carbon cell-(1) gained by photosynthesis corresponded to 79% of the carbon cell-(1) gained by bacterial ingestion. Furthermore, due to a... (More)
- The mixotroph Poterioochromonas malhamensis was grown in batch and semicontinuous cultures in order to examine the dependence of phagotrophy versus phototrophy at bacterial densities similar to those found in oligo- and mesotrophic lakes in combination with differing light regimes. In addition, the growth rates and biomass accumulation of the mixotroph were compared to those of the heterotroph Spumella elongata grown under similar conditions. In P. malhamensis, primary production rates and cell-specific chlorophyll a concentrations were significantly higher when grown at low bacterial densities, and the carbon cell-(1) gained by photosynthesis corresponded to 79% of the carbon cell-(1) gained by bacterial ingestion. Furthermore, due to a longer exponential growth phase, cell densities and biomass of P. malhamensis were significantly higher when the mixotroph was cultured in high light than in darkness. As a result, the cumulative biomass of the mixotroph was significantly higher in the light treatments than the biomass of the heterotroph at similar bacterial densities. These results suggest that photosynthesis may contribute more to the nutrition of P. Malhamensis in lakes with low bacterial abundances than previously suggested, and that the mixotroph's capacity for photosynthesis enables it to dominate in terms of biomass over the heterotroph. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/136611
- author
- Pålsson, Carina LU and Daniel, Cesar Bolivar LU
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Aquatic Microbial Ecology
- volume
- 36
- issue
- 3
- pages
- 247 - 256
- publisher
- Inter-Research
- external identifiers
-
- wos:000224897600005
- scopus:6344291712
- ISSN
- 0948-3055
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Limnology (Closed 2011) (011007000)
- id
- 2a05517b-4a9e-484d-90ca-498bd24b40a0 (old id 136611)
- alternative location
- http://www.int-res.com/articles/ame2004/36/a036p247.pdf
- http://www.limnol.lu.se/limnologen/publikationer/475.pdf
- date added to LUP
- 2016-04-01 17:11:29
- date last changed
- 2022-04-07 21:31:20
@article{2a05517b-4a9e-484d-90ca-498bd24b40a0,
abstract = {{The mixotroph Poterioochromonas malhamensis was grown in batch and semicontinuous cultures in order to examine the dependence of phagotrophy versus phototrophy at bacterial densities similar to those found in oligo- and mesotrophic lakes in combination with differing light regimes. In addition, the growth rates and biomass accumulation of the mixotroph were compared to those of the heterotroph Spumella elongata grown under similar conditions. In P. malhamensis, primary production rates and cell-specific chlorophyll a concentrations were significantly higher when grown at low bacterial densities, and the carbon cell-(1) gained by photosynthesis corresponded to 79% of the carbon cell-(1) gained by bacterial ingestion. Furthermore, due to a longer exponential growth phase, cell densities and biomass of P. malhamensis were significantly higher when the mixotroph was cultured in high light than in darkness. As a result, the cumulative biomass of the mixotroph was significantly higher in the light treatments than the biomass of the heterotroph at similar bacterial densities. These results suggest that photosynthesis may contribute more to the nutrition of P. Malhamensis in lakes with low bacterial abundances than previously suggested, and that the mixotroph's capacity for photosynthesis enables it to dominate in terms of biomass over the heterotroph.}},
author = {{Pålsson, Carina and Daniel, Cesar Bolivar}},
issn = {{0948-3055}},
language = {{eng}},
number = {{3}},
pages = {{247--256}},
publisher = {{Inter-Research}},
series = {{Aquatic Microbial Ecology}},
title = {{Effects of prey abundance and light intensity on nutrition of a mixotrophic flagellate and its competitive relationship with an obligate heterotroph}},
url = {{http://www.int-res.com/articles/ame2004/36/a036p247.pdf}},
volume = {{36}},
year = {{2004}},
}