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Primary production in two shallow lakes with contrasting plant form dominance: A paradox of enrichment?

Blindow, I ; Hargeby, Anders LU ; Meyercordt, J and Schubert, H (2006) In Limnology and Oceanography 51(6). p.2711-2721
Abstract
We estimated total lake plant biomass and primary net production in two shallow Swedish lakes that differ in nutrient loading and plant form dominance. In clearwater Lake Krankesjon (10 mu g chlorophyll a L-1), submerged macrophytes contributed more than phytoplankton and epiphyton to the estimated plant biomass. Estimated net primary production during May to September was 90-130, 1.2, and 14 g C m(-2) for phytoplankton, epiphyton, and submerged macrophytes, respectively. In turbid Lake Borringesjon (60-80 mu g chlorophyll a L-1), primary production by submerged macrophytes and periphyton was negligible. Although gross primary production of phytoplankton was high close to the water surface, estimated areal net primary production during May... (More)
We estimated total lake plant biomass and primary net production in two shallow Swedish lakes that differ in nutrient loading and plant form dominance. In clearwater Lake Krankesjon (10 mu g chlorophyll a L-1), submerged macrophytes contributed more than phytoplankton and epiphyton to the estimated plant biomass. Estimated net primary production during May to September was 90-130, 1.2, and 14 g C m(-2) for phytoplankton, epiphyton, and submerged macrophytes, respectively. In turbid Lake Borringesjon (60-80 mu g chlorophyll a L-1), primary production by submerged macrophytes and periphyton was negligible. Although gross primary production of phytoplankton was high close to the water surface, estimated areal net primary production during May to September was low, -40 to +25 g C m(-2), as a result of self-shading and high respiration. Grazing pressure from zooplankton rarely exceeded 15% d(-1) in both lakes, indicating that phytoplankton production was not limited by grazing. Low gross epiphyton production could result from high grazing by macroinvertebrates and thus higher trophic transfer efficiency through the benthic than through the pelagic food web. Provided that conditions in Lake Borringesjon reflect previous turbid state conditions in Lake Krankesjon, our results may explain why a shift to a clearwater state was followed by increased biomass of higher trophic levels. Our results also support the paradox of enrichment hypothesis, which predicts lower productivity at high nutrient loading. Contrary to former investigations, we found lower production at a higher nutrient loading already at the trophic level of primary producers. (Less)
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; ; and
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type
Contribution to journal
publication status
published
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in
Limnology and Oceanography
volume
51
issue
6
pages
2711 - 2721
publisher
ASLO
external identifiers
  • wos:000242265700018
  • scopus:33845414127
ISSN
1939-5590
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
4520adb3-fb5c-4373-b186-d562638ee484 (old id 163727)
alternative location
http://www.aslo.org/lo/pdf/vol_51/issue_6/2711.pdf
date added to LUP
2016-04-01 16:59:25
date last changed
2021-10-10 04:18:23
@article{4520adb3-fb5c-4373-b186-d562638ee484,
  abstract     = {We estimated total lake plant biomass and primary net production in two shallow Swedish lakes that differ in nutrient loading and plant form dominance. In clearwater Lake Krankesjon (10 mu g chlorophyll a L-1), submerged macrophytes contributed more than phytoplankton and epiphyton to the estimated plant biomass. Estimated net primary production during May to September was 90-130, 1.2, and 14 g C m(-2) for phytoplankton, epiphyton, and submerged macrophytes, respectively. In turbid Lake Borringesjon (60-80 mu g chlorophyll a L-1), primary production by submerged macrophytes and periphyton was negligible. Although gross primary production of phytoplankton was high close to the water surface, estimated areal net primary production during May to September was low, -40 to +25 g C m(-2), as a result of self-shading and high respiration. Grazing pressure from zooplankton rarely exceeded 15% d(-1) in both lakes, indicating that phytoplankton production was not limited by grazing. Low gross epiphyton production could result from high grazing by macroinvertebrates and thus higher trophic transfer efficiency through the benthic than through the pelagic food web. Provided that conditions in Lake Borringesjon reflect previous turbid state conditions in Lake Krankesjon, our results may explain why a shift to a clearwater state was followed by increased biomass of higher trophic levels. Our results also support the paradox of enrichment hypothesis, which predicts lower productivity at high nutrient loading. Contrary to former investigations, we found lower production at a higher nutrient loading already at the trophic level of primary producers.},
  author       = {Blindow, I and Hargeby, Anders and Meyercordt, J and Schubert, H},
  issn         = {1939-5590},
  language     = {eng},
  number       = {6},
  pages        = {2711--2721},
  publisher    = {ASLO},
  series       = {Limnology and Oceanography},
  title        = {Primary production in two shallow lakes with contrasting plant form dominance: A paradox of enrichment?},
  url          = {http://www.aslo.org/lo/pdf/vol_51/issue_6/2711.pdf},
  volume       = {51},
  year         = {2006},
}