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Facies

, Volume 16, Issue 1, pp 1–9 | Cite as

Diversity and distributional patterns of reef building scleractinians in recent lagoonal patch reefs on the Coast of Kenya

  • Wolf-Christian Dullo
  • Georg Süßmeier
  • Gerd Friedrich Tietz
Article

Summary

Four patch reef areas were mapped in detail within the microatoll zone of the narrow fringing reef near Kilifi (Coast of Kenya). The biota of these four test areas were counted according to frame building scleractinians and reef dwellers, including calcareous algae. The species diversity of the scleractinians was evaluated using the Shannon Wiener Theory Index. This index is small in landward patches, increasing towards the inner microatooll zone with a maximum almost at the beginning of the rear reef. Here, this index becomes zero, probably owing to decreasing water depths that limit vertical patch reef growth within the lagoonal environment. The interaction between the substrate preparation by coralline algae and reef destruction by sea urchins are additionally important factors influencing this species diversity pattern.

Diversität und Verteilungsmuster riffbildender Steinkorallen in rezenten, lagunären Fleckenriffen an der Küste Kenyas

Zusammenfassung

In einem schmalen Saumriff an der kenyanischen Küste wurden vier Fleckenriff-Areale innerhalb der Mikroatollzone kartiert und ihr Faunen- und Florenanteil quantitativ erfaßt. Die Artendiversität der Scleractinia, die nach dem Shannon Wiener Theorie Index ermittelt wurde, ist in landnähren Fleckenriffen gering, steigt gegen die Mitte der Mikroatollzone bis fast zu Beginn des Rückriffs an und sinkt an der Rückriffkante auf Null zurück. Dies ist einerseits durch die geringe Wassertiefe im lagunären Fleckenriffareal bedingt, die ein vertikales Riffwachstum rasch ausschließt und zu erhöhten Anteilen abgestorbener Korallenkolonien führt. Andererseits spielt die Wechselbeziehung zwischen den substratpräparierenden Rotalgen und den die Riffknospen durch Bioerosion zerstörenden Seeigeln ebenso eine wichtige Rolle.

Schlüsselwörter

Scleractinians Species diversity Recent reefs Indian ocean Kenya 

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Copyright information

© Institut für Paläontologie, Universität Erlangen 1987

Authors and Affiliations

  • Wolf-Christian Dullo
    • 1
  • Georg Süßmeier
    • 2
  • Gerd Friedrich Tietz
    • 1
  1. 1.Institut für PaläontologieUniversität ErlangenErlangen
  2. 2.Backnang

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