The influence of fluctuating light intensities on species composition and diversity of natural phytoplankton communities

Sabine Flöder, Jotaro Urabe, Zen ichiro Kawabata

研究成果: Article

48 引用 (Scopus)

抜粋

The influence of fluctuating light intensities on phytoplankton composition and diversity was investigated for 49 days under semi-continuous culture conditions with sufficient nutrient supply, using phytoplankton assemblages from Lake Biwa, Japan. Light conditions were either periodically changed from high intensity (100 μmol photons m-2 s-1) to low intensity (20 μmol photons m-2 s-1) at intervals of 1, 3, 6 and 12 days, or fixed to constant intensities (permanent high and low light levels). All treatments additionally experienced a day:night cycle of 16:8 h. Phytoplankton abundance increased and reached a saturation level on day 19 of the treatment with permanent high light, but increased continuously until the end of the experiment (day 49) in the treatment with permanent low light intensity. In treatments with periodically changing light intensities, the phytoplankton abundance reached saturation levels between these dates. Under phytoplankton abundance saturation, chlorophytes predominated in the treatment with permanent high light, while either cyanophytes or diatoms were abundant under permanent low light intensity. Treatments with changing light supply had chlorophyte- and cyanobacteria-dominated replicates as well as replicates with balanced proportions of both. Furthermore, species diversity, measured by the Shannon index, was low in cultures under permanent light intensity, while slow fluctuating light at the scale of 3-12 days resulted in an increased diversity index. These results indicate that species composition and diversity of the phytoplankton were affected by the periodically changing light regime in the order of days, and suggest that temporal changes in weather conditions are a major impediment to competitive exclusion of phytoplankton species in nature.

元の言語English
ページ(範囲)395-401
ページ数7
ジャーナルOecologia
133
発行部数3
DOI
出版物ステータスPublished - 2002 12 1
外部発表Yes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

フィンガープリント The influence of fluctuating light intensities on species composition and diversity of natural phytoplankton communities' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用