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4 December 1998 Spatial and temporal distribution of algae in soil crusts in the Sahel of W Africa: Preliminary results
Andrea Hahn, Hannelore Kusserow
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As part of an international project dealing with genetic diversity in wild forage species of the Sahelian Zone, a preliminary investigation of soil algal crusts in highly degraded environments was made. Soil sealing and the formation of crusts belong to the complex mechanisms of desertification processes. The kinds of soil algae present in the crusts and their temporal dynamics through the seasons are of relevance for the understanding of these processes. Surface crust samples from two wet and two dry seasons were examined for their algal flora by culturing and microscopy, in order to assess the role of algae in such processes. At least two different types of crusts were distinguished: dark crusts with a high algal contribution, dominated by filamentous blue-green algae (cyanobacteria), and light crusts with a far lesser algal contribution. The development of cyanobacterial crusts over two years suggests a seasonality, with a codominance of coccal green algae during the dry seasons. On light soils, a gradient was also apparent in the algal flora from sealed to sandy patches. In long-term development of fast changing arid ecosystems such as the Sahel, soil algae might prove a useful bio-indicator in screening for desertification and revegetation.

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S. E. Campbell 1979: Soil stabilization by a prokaryotic desert crust: Implications for precambrian land biota. —  Origins Life 9: 335–348. Google Scholar


S. E. Campbell & J.-S. Seeler & S. Golubic 1989: Desert crust formation and soil stabilization. — Arid Soil Res. Rehab. 3: 217–228. Google Scholar


A. Casenave & C. Valentin 1989: Les états de surface de la zone Sahélienne. — Paris. Google Scholar


A. Danin 1978: Plant species diversity and plant succession in a sandy area in the northern Negev. — Flora 167: 409–422. Google Scholar


H. Ettl & G. Gärtner 1995: Syllabus der Boden-, Luft- und Flechtenalgen. — Jena. Google Scholar


R. P. Ewing & S. C. Gupta 1994: Pore-scale network modeling of compaction and filtration during surface sealing. — Soil Sci. Soc. Amer. J. 58: 712–720. Google Scholar


A. E. Grondin & J. R. Johansen 1993: Microbial spatial heterogeneity in microbiotic crusts in Colorado National Monument. 1. Algae. —  Great Basin Naturalist 53: 24–30. Google Scholar


K. T. Harper & J. R. Marble 1988: A role for nonvascular plants in management of arid and semiarid rangelands. — Pp. 133–169 in: P. T. Tueller (ed.), Vegetation science applications for rangeland analysis and management. — Dordrecht. Google Scholar


A. O. Isichei 1980: Nitrogen fixation by blue-green algal soil crusts in Nigerian savanna. — Pp. 191–199 in: T. Rosswall (ed.). Nitrogen cycling in West African ecosystems. — Stockholm. Google Scholar


H. Kusserow 1994: Quantitative und qualitative Erfassung von Vegetationsänderungen. Ein Beispiel aus dem Südsahel Malis. — Die Erde 125: 35–56. Google Scholar


H. Kusserow 1997: Patterns of genetic diversity in wild forage species and in situ conservation in the Sahel. — Gesellschaft für Technische Zusammenarbeit (GTZ), Final report Project No. 91.7860.901.165. Google Scholar


H. N. Le Houérou 1989: The grazing land ecosystem of the African Sahel. — Berlin, etc. Google Scholar


S. G. Loftis & E. B. Kurtz 1980: Field studies of inorganic nitrogen added to semiarid soils by rainfall and blue-green algae. —  Soil Sci. 129: 150–155. Google Scholar


M. Mainguet 1991: Desertification. National background and human mismanagement. — Berlin, etc. Google Scholar


H. G. Mensching 1990: Desertifikation. Ein weltweites Problem der ökologischen Verwüstung in den Trockengebieten der Erde. — Darmstadt. Google Scholar


B. Metting 1981: The systematics and ecology of soil algae. —  Bot. Rev. (Lancaster) 52: 195–312. Google Scholar


I. Noy-Meir 1973: Desert ecosystems: Environment and producers. —  Annual Rev. Ecol. Syst. 4: 25–51. Google Scholar


S. Scherer , A. Ernst , T.-W. Chen & P. Böger 1984: Rewetting of drought-resistant blue-green algae: Time course of water uptake and reappearance of respiration, photosynthesis, and nitrogen fixation. —  Oecologia 62: 418–423. Google Scholar


M. Shachak & Y. Steinberger 1980: An algae-desert snail food chain: Energy flow and soil turnover. —  Oecologia 146: 402–411. Google Scholar


L. M. Shields & L. W. Durrell 1964: Algae in relation to soil fertility. —  Bot. Rev. (Lancaster) 30: 92–128. Google Scholar


L. E. Shubert & T. L. Starks 1979: Algal succession on orphaned coal mine spoils. — Pp. 661–669 in: M. K. Wali (ed.). Ecology and coal resource development. — New York. Google Scholar


L. E. Shubert & T. L. Starks 1980: Soil algal relationships from surface mined soils. — Brit. Phycol. J. 15: 417–428. Google Scholar


J. Skujins & B. Klubek 1978: Nitrogen fixation and cycling by blue-green algae-lichen-crusts in arid rangeland soils. — Ecol. Bull. 26: 164–171. Google Scholar


L. L. St. Clair , B. L. Webb , J. R. Johansen & G. T. Nebeker 1984: Cryptogamic soil crusts: Enhancement of seedling establishment in disturbed and undisturbed areas. — Reclam. Reveg. Res. 3: 129–136. Google Scholar


T. L. Starks , L. E. Shubert & F. R. Trainor 1981: Ecology of soil algae: A review. — Phycologia 20: 65–80. Google Scholar


G. Uehara & R. C. Jones 1974: Bonding mechanisms for soil crusts 1. Particle surfaces and cementing agents. — [In: J. W. Cary & D. D. Evans (ed.). Soil crusts]. — Arizona Agrie. Exper. Sta., Techn. Bull. 214: 17–28. Google Scholar


N. E. West 1990: Structure and function of microphytic soil crusts in wildland ecosystems of arid to semiarid regions. —  Advances Ecol. Res. 20: 179–223. Google Scholar
Andrea Hahn and Hannelore Kusserow "Spatial and temporal distribution of algae in soil crusts in the Sahel of W Africa: Preliminary results," Willdenowia 28(1/2), 227-238, (4 December 1998).
Published: 4 December 1998
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