Possible Ecological Implications of Floating Microbial Assemblages Lifted from the Lakebed on an Antarctic Lake

Yukiko Tanabe, Sakae Kudoh

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Microbial assemblages can be found drifting/floating in lake water and being washed ashore in continental Antarctica. Two field studies in early and late January 2008 measured the light utilization properties and photosynthetic responses of these assemblages, which were then compared with those of pelagic and benthic microbial communities to evaluate the ecological implications of this phenomenon. The nutrient concentrations were low in the lake water, indicating oligotrophic conditions. Based on microscopic and pigment analysis, both the floating and benthic communities were mainly composed of Oedogonium sp. (Chlorophyceae), followed by cyanobacteria, diatoms, and dinoflagellates. Floating assemblages had a firmer and denser structure, and possessed more rich carotenoids than the benthic community. Measurements of photosynthesis conducted in early January indicated that the activities of the floating assemblages were considerably low. In late January almost all floating assemblages on the lakeshore turned white because of freezing and drying by the ambient temperature decrease, and had no photosynthetic signals. These results suggest that the floating assemblages could spontaneously lift off from the lakebed because of the bubbles created by photosynthesis and then repeatedly roll, flip, sink, or float depending on buoyancy. In addition, this phenomenon seemed to greatly change the cycling of matter by transporting the lake's photosynthetic products to the surrounding ecosystems, then give the benthic subsurface communities in dark regions a chance to reactivate such as gap regeneration in the case of climax forest, and also allow the floating assemblages to restart photosynthesis at the top of the lakebed by resinking.

Original languageEnglish
Pages (from-to)359-367
Number of pages9
JournalEcological Research
Volume27
Issue number2
DOIs
Publication statusPublished - 2012 Mar

Fingerprint

photosynthesis
lakes
lake water
benthos
lake
climax forests
Oedogonium
Chlorophyceae
Bacillariophyceae
climax
bubbles
carotenoid
dinoflagellate
Antarctica
buoyancy
freezing
microbial communities
bubble
pigment
Cyanobacteria

Keywords

  • Antarctica
  • Arctic
  • Ecosystem
  • Lake
  • Material cycling
  • Oligotrophic
  • Photosynthesis
  • Polar
  • Production

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Possible Ecological Implications of Floating Microbial Assemblages Lifted from the Lakebed on an Antarctic Lake. / Tanabe, Yukiko; Kudoh, Sakae.

In: Ecological Research, Vol. 27, No. 2, 03.2012, p. 359-367.

Research output: Contribution to journalArticle

@article{c9cbce665f9648eeb56f3ab80b700c79,
title = "Possible Ecological Implications of Floating Microbial Assemblages Lifted from the Lakebed on an Antarctic Lake",
abstract = "Microbial assemblages can be found drifting/floating in lake water and being washed ashore in continental Antarctica. Two field studies in early and late January 2008 measured the light utilization properties and photosynthetic responses of these assemblages, which were then compared with those of pelagic and benthic microbial communities to evaluate the ecological implications of this phenomenon. The nutrient concentrations were low in the lake water, indicating oligotrophic conditions. Based on microscopic and pigment analysis, both the floating and benthic communities were mainly composed of Oedogonium sp. (Chlorophyceae), followed by cyanobacteria, diatoms, and dinoflagellates. Floating assemblages had a firmer and denser structure, and possessed more rich carotenoids than the benthic community. Measurements of photosynthesis conducted in early January indicated that the activities of the floating assemblages were considerably low. In late January almost all floating assemblages on the lakeshore turned white because of freezing and drying by the ambient temperature decrease, and had no photosynthetic signals. These results suggest that the floating assemblages could spontaneously lift off from the lakebed because of the bubbles created by photosynthesis and then repeatedly roll, flip, sink, or float depending on buoyancy. In addition, this phenomenon seemed to greatly change the cycling of matter by transporting the lake's photosynthetic products to the surrounding ecosystems, then give the benthic subsurface communities in dark regions a chance to reactivate such as gap regeneration in the case of climax forest, and also allow the floating assemblages to restart photosynthesis at the top of the lakebed by resinking.",
keywords = "Antarctica, Arctic, Ecosystem, Lake, Material cycling, Oligotrophic, Photosynthesis, Polar, Production",
author = "Yukiko Tanabe and Sakae Kudoh",
year = "2012",
month = "3",
doi = "10.1007/s11284-011-0907-3",
language = "English",
volume = "27",
pages = "359--367",
journal = "Ecological Research",
issn = "0912-3814",
publisher = "Springer Japan",
number = "2",

}

TY - JOUR

T1 - Possible Ecological Implications of Floating Microbial Assemblages Lifted from the Lakebed on an Antarctic Lake

AU - Tanabe, Yukiko

AU - Kudoh, Sakae

PY - 2012/3

Y1 - 2012/3

N2 - Microbial assemblages can be found drifting/floating in lake water and being washed ashore in continental Antarctica. Two field studies in early and late January 2008 measured the light utilization properties and photosynthetic responses of these assemblages, which were then compared with those of pelagic and benthic microbial communities to evaluate the ecological implications of this phenomenon. The nutrient concentrations were low in the lake water, indicating oligotrophic conditions. Based on microscopic and pigment analysis, both the floating and benthic communities were mainly composed of Oedogonium sp. (Chlorophyceae), followed by cyanobacteria, diatoms, and dinoflagellates. Floating assemblages had a firmer and denser structure, and possessed more rich carotenoids than the benthic community. Measurements of photosynthesis conducted in early January indicated that the activities of the floating assemblages were considerably low. In late January almost all floating assemblages on the lakeshore turned white because of freezing and drying by the ambient temperature decrease, and had no photosynthetic signals. These results suggest that the floating assemblages could spontaneously lift off from the lakebed because of the bubbles created by photosynthesis and then repeatedly roll, flip, sink, or float depending on buoyancy. In addition, this phenomenon seemed to greatly change the cycling of matter by transporting the lake's photosynthetic products to the surrounding ecosystems, then give the benthic subsurface communities in dark regions a chance to reactivate such as gap regeneration in the case of climax forest, and also allow the floating assemblages to restart photosynthesis at the top of the lakebed by resinking.

AB - Microbial assemblages can be found drifting/floating in lake water and being washed ashore in continental Antarctica. Two field studies in early and late January 2008 measured the light utilization properties and photosynthetic responses of these assemblages, which were then compared with those of pelagic and benthic microbial communities to evaluate the ecological implications of this phenomenon. The nutrient concentrations were low in the lake water, indicating oligotrophic conditions. Based on microscopic and pigment analysis, both the floating and benthic communities were mainly composed of Oedogonium sp. (Chlorophyceae), followed by cyanobacteria, diatoms, and dinoflagellates. Floating assemblages had a firmer and denser structure, and possessed more rich carotenoids than the benthic community. Measurements of photosynthesis conducted in early January indicated that the activities of the floating assemblages were considerably low. In late January almost all floating assemblages on the lakeshore turned white because of freezing and drying by the ambient temperature decrease, and had no photosynthetic signals. These results suggest that the floating assemblages could spontaneously lift off from the lakebed because of the bubbles created by photosynthesis and then repeatedly roll, flip, sink, or float depending on buoyancy. In addition, this phenomenon seemed to greatly change the cycling of matter by transporting the lake's photosynthetic products to the surrounding ecosystems, then give the benthic subsurface communities in dark regions a chance to reactivate such as gap regeneration in the case of climax forest, and also allow the floating assemblages to restart photosynthesis at the top of the lakebed by resinking.

KW - Antarctica

KW - Arctic

KW - Ecosystem

KW - Lake

KW - Material cycling

KW - Oligotrophic

KW - Photosynthesis

KW - Polar

KW - Production

UR - http://www.scopus.com/inward/record.url?scp=84858791991&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84858791991&partnerID=8YFLogxK

U2 - 10.1007/s11284-011-0907-3

DO - 10.1007/s11284-011-0907-3

M3 - Article

VL - 27

SP - 359

EP - 367

JO - Ecological Research

JF - Ecological Research

SN - 0912-3814

IS - 2

ER -