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Publication Type J
Authors Mangora, MM; Mtolera, MSP; Bjork, M
Author Full Name Mangora, M. M.; Mtolera, M. S. P.; Bjork, M.
Title Effects of waterlogging, salinity and light on the productivity of Bruguiera gymnorrhiza and Heritiera littoralis seedlings
Source AFRICAN JOURNAL OF MARINE SCIENCE
Language English
Document Type Article
Author Keywords ecophysiology; growth; mangrove forests; mesocosm experiment; photosynthetic yield; survival
Keywords Plus SEA-LEVEL RISE; MANGROVE SEEDLINGS; RHIZOPHORA-STYLOSA; CLIMATE-CHANGE; RED MANGROVE; SOUTH-AFRICA; GROWTH; LEAF; PHOTOSYNTHESIS; CONDUCTANCE
Abstract This study aimed to establish the effects of waterlogging, salinity and light on the early development of mangroves. Seedlings of Bruguiera gymnorrhiza (L.) Lamk. and Heritiera littoralis Dryand were exposed to 12 weeks of waterlogging, during which time growth and photosynthesis were measured every two weeks. The salinity of the water inundation ranged from fresh water to full-strength sea water (salinity 35). Seedlings were exposed to either full sunlight of 1 500 mu mol photon m(-2) s(-1) (SD 397) at midday or shade conditions of 325 mu mol photon m(-2) s(-1) (SD 40) of light at midday, to explore whether the plants would be differently affected by prolonged waterlogging in increased salinities and under different light conditions. Heritiera littoralis was more sensitive to waterlogging, salinity and light, displaying a least relative growth rate of 0.127 g g(-1) week(-1) (SE 0.032) under shade, and 0.025 g g(-1) week(-1) (SE 0.021) in full light; while under shade, photosynthesis continued only in fresh water, but photosynthetic yield decreased from 0.7 to 0.4 with increasing duration of waterlogging. By 12 weeks, all H. littoralis seedlings treated with any saltwater mixture had died. Bruguiera gymnorrhiza seedlings maintained a moderate rate of photosynthesis throughout inundation in both shade and full light, with yields of 0.7 and 0.3, respectively. Furthermore, B. gymnorrhiza survived waterlogging in up to 66% seawater, and maintained comparable relative growth rates of 0.164 g g(-1) week(-1) (SE 0.066) with 0.083 g g(-1) week(-1) (SE 0.065) and 0.074 g g(-1) week(-1) (SE 0.036) with 0.052 g g(-1) week(-1) (SE 0.037) under shade and in full light between fresh water and the highest salinity conditions, respectively. These results suggest that B. gymnorrhiza is broadly tolerant, making it a potential candidate species for restoring vulnerable mangrove forests.
Author Address [Mangora, M. M.; Mtolera, M. S. P.] Univ Dar Es Salaam, Inst Marine Sci, Zanzibar, Tanzania; [Bjork, M.] Stockholm Univ, Dept Ecol Environm & Plant Sci, Stockholm, Sweden
Reprint Address Mangora, MM (reprint author), Univ Dar Es Salaam, Inst Marine Sci, Zanzibar, Tanzania.
E-mail Address mmangora@yahoo.com
ORCID Number Bjork, Mats/0000-0003-0363-110X
Funding Agency and Grant Number University of Dar es Salaam (Tanzania); Stockholm University (Sweden); Western Indian Ocean Marine Science Association (WIOMSA) at the Department of Ecology, Environment and Plant Sciences, Stockholm University
Funding Text Funding for the field expenses and part of the data analysis were provided by the Sida Bilateral Marine Science Programme, implemented by the University of Dar es Salaam (Tanzania) and Stockholm University (Sweden). The Western Indian Ocean Marine Science Association (WIOMSA) supported the first author through a travel grant for placement at the Department of Ecology, Environment and Plant Sciences, Stockholm University, to allow for additional data analysis and writing of the manuscript.
Cited Reference Count 45
Publisher NATL INQUIRY SERVICES CENTRE PTY LTD
Publisher City GRAHAMSTOWN
Publisher Address 19 WORCESTER STREET, PO BOX 377, GRAHAMSTOWN 6140, SOUTH AFRICA
ISSN 1814-232X
29-Character Source Abbreviation AFR J MAR SCI
ISO Source Abbreviation Afr. J. Mar. Sci.
Year Published 2017
Volume 39
Issue 2
Beginning Page 167
Ending Page 174
Digital Object Identifier (DOI) 10.2989/1814232X.2017.1328372
Page Count 8
Web of Science Category Marine & Freshwater Biology
Subject Category Marine & Freshwater Biology
Document Delivery Number FG7DT
Unique Article Identifier WOS:000410573800004
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