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Trees

, Volume 30, Issue 1, pp 35–45 | Cite as

How are anatomical and hydraulic features of the mangroves Avicennia marina and Rhizophora mucronata influenced by siltation?

  • Hannes De DeurwaerderEmail author
  • J. A. Okello
  • N. Koedam
  • N. Schmitz
  • K. Steppe
Original Article
Part of the following topical collections:
  1. Long Distance Transport: Phloem and Xylem

Abstract

Key message

This article provides significant data in the debate on whether siltation might have a negative impact on the hydraulic functioning of two widespread mangrove tree species Avicennia marina and Rhizophora mucronata.

Abstract

Elevated sediment addition, or siltation, within mangrove ecosystems is considered as being negative for trees and saplings, resulting in stress and higher mortality rates. However, little is known about how siltation influences the hydraulic functioning of mangrove trees. Comparing two mangrove tree species (Avicennia marina Vierh. Forsk. and Rhizophora mucronata Lam.) from low and high-siltation plots led to the detection of anatomical and morphological differences and tendencies. Adaptations to high siltation were found to be either mutual among both species, e.g., significant smaller single leaf area (p A.marina  = 0.058, F1.38 = 3.8; p R.mucronata  = 0.005, F1.38 = 8.7; n = 20 × 20) and a tendency towards smaller stomatal areas (p A.marina  = 0.131, F1.8 = 2.8; p R.mucronata  = 0.185, F1.8 = 2.1, n = 5 × 60), or species-specific trends for A. marina, such as higher phloem band/growth layer ratios (p = 0.101, F1.8 = 3.4, n = 5 × 3) and stomatal density (p = 0.052, F1.8 = 5.2, n = 5 × 4). All adaptations seemingly contributed to a comparable hydraulic conductivity independent of the degree of siltation. These findings indicate that silted trees level off fluctuations in their hydraulic performance as a survival mechanism to cope with this less favourable environment. Most of the trees’ structural adaptations to cope with siltation are similar to known drought stress-imposed adaptations.

Keywords

Hydraulic conductivity Wood anatomy Stomata Leaf area Phloem band/growth layer ratio 

Notes

Acknowledgments

The authors are very grateful for the attribution of George Onduso and Eric Okuku, without whom the measurement campaign never would have succeeded. For all the help during the measurement campaign and laboratory work, we would like to thank Samuel Njoroge, Naftali Mukua, Oduor Nancy Awuor, Jan Van Den Bulcke and Piet Dekeyser. Soil analysis was performed by Sturcky Okumu and Oliver Ochola. For statistical support, the authors are grateful towards Rosanna Overholser (FIRE—Fostering Innovative Research based on Evidence—statistical consulting). We also want to thank Veerle De Schepper and Elisabeth M.R. Robert for commenting the M.Sc. text. For logistic support we like to thank Jared Bosire (Kenya Marine and Fisheries Research Institute, KMFRI), Hans Beeckman (Laboratory of Wood Biology and Xylarium, Royal Museum for Central Africa) and Joris Van Acker (Laboratory of Wood Technology—Woodlab, UGent). Additionally, the authors gratefully thank the 3 anonymous reviewers for their constructive comments.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Hannes De Deurwaerder
    • 1
    Email author
  • J. A. Okello
    • 2
    • 3
  • N. Koedam
    • 3
  • N. Schmitz
    • 3
    • 4
  • K. Steppe
    • 1
  1. 1.Laboratory of Plant Ecology, Faculty of Bioscience EngineeringGhent University (UGent)GhentBelgium
  2. 2.Kenya Marine and Fisheries Research Institute (KMFRI)MombasaKenya
  3. 3.Laboratory of Plant Biology and Nature Management (APNA)Vrije Universiteit Brussel (VUB)BrusselsBelgium
  4. 4.Universität für Bodenkultur Wien (BOKU)ViennaAustria

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