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Hydrobiologia

, Volume 748, Issue 1, pp 161–169 | Cite as

Microhabitat variations in diatom composition and stable isotope ratios of the epilithic algae in Lake Malawi

  • Atsushi MaruyamaEmail author
  • Kohei Shinohara
  • Michito Sakurai
  • Taisuke Ohtsuka
  • Bosco Rusuwa
ADVANCES IN CICHLID RESEARCH

Abstract

Microhabitat-level spatial variations in diatom and isotope compositions of epilithic periphyton in the littoral zones of Lake Malawi were examined using periphyton samples collected from seven regions of the lake. Discriminant analysis revealed a clear difference in diatom composition among the slopes of the rocks from which the samples were collected. This difference may be associated with interspecific variation in the adhesive power of diatoms. The slope of the rocks also strongly affected the stable carbon isotope ratios of periphyton, together with subsidiary effects of algae size class, sampling site, depth, and some of their interaction terms. The effect of slope can be explained by the decrease in photosynthetic activity along the slope, which originates from the decline in sunlight. Thus, the diatom composition and carbon isotope ratios may be good indicators of microhabitat and have the potential to be powerful tools for quantitative measurement of microhabitat utilization of epilithic algae-feeding consumers of this lake, including territorial cichlids.

Keywords

Attached algae δ13Gut content Niche Periphyton Slope Stable carbon isotope Rock slope 

Notes

Acknowledgments

We are grateful to Mr R. Zatha, Mr Y. Kazembe, Mr B. Matundu, Mr A. Nyoni, and Mr A. Mangawa at the University of Malawi for their support during sample collection. We also thank Ms Y. Nonomatsu, Ms M. Umemoto, Mr Y. Nakamura, and Ms E. Ishizumi for their assistance with laboratory analyses. Our thanks go to Dr M. Yuma, Dr M. Genner, and anonymous reviewers for their constructive criticism. This study was conducted in accordance with the prevailing laws of the Republic of Malawi. Financial support was provided by the Joint Research Centre for Science and Technology of Ryukoku University and by JSPS KAKENHI Grant Number 25840144.

Supplementary material

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Supplementary material 1 (DOCX 124 kb)

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Atsushi Maruyama
    • 1
    Email author
  • Kohei Shinohara
    • 1
  • Michito Sakurai
    • 1
  • Taisuke Ohtsuka
    • 2
  • Bosco Rusuwa
    • 3
  1. 1.Faculty of Science and TechnologyRyukoku UniversityOtsuJapan
  2. 2.Lake Biwa MuseumKusatsuJapan
  3. 3.Department of Biological Sciences, Chancellor CollegeUniversity of MalawiZombaMalawi

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