Sains Malaysiana 42(8)(2013): 1059–1064


Physiological Responses of Avicennia marina var. acutissima and Bruguiera

parviflora under Simulated Rise in Sea Level

(Respon Fisiologi Avicennia marina var. acutissimadan Bruguiera parviflora

di Bawah Simulasi Kenaikan Aras Air Laut)


M.Z. Rasheed, O. Normaniza* & M.Z. Rozainah

Institute of Biological Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia


Received: 1 November 2011/Accepted: 3 April 2013



Climate change components such as increased in atmospheric carbon dioxide (CO2) and rising sea levels are likely to affect mangrove ecosystems. Healthy mature propagules of A. marina var. acutissima and B. Parviflora were subjected to two tidal treatments; shallow and deep; for six months. Shallow treatment mimicked the current tidal fluctuations and deep treatment simulated future tidal conditions under rise in sea level. Deep treatment decreased Amax of both species and significant two way interactions between tidal treatments and species were observed. A400 was significantly reduced in the deep treatment in B. parviflora but not in A. marina. Carbon dioxide compensation point was not affected by the tidal treatments but varied significantly between both species. The ratio A400/Amax was significantly lower in the shallow treatment in B. parviflora indicating higher carbon sink potential at moderate tidal flooding whereas A400/Amax of A. marina was less variable between tidal treatments. Chlorophyll conductance was insensitive to tidal flooding but was significantly higher in B. parviflora than in A. marina. Carbon sequestration of  B. parviflora was substantially reduced in the deep treatment while the difference between tidal treatments was much less in A. marina. These results indicated that these two species responded differently under tidal flooding where A. marina was less sensitive to tidal. Thus, A. marina is better adapted to the projected climate change than B. parviflora.


Keywords: Climate change; inundation; mangroves; seedling growth; water logging



Unsur-unsur perubahan iklim seperti kenaikan karbon dioksida atmosfera dan aras air laut sememangnya mempengaruhi ekosistem hutan paya bakau. Dalam kajian ini, propagulAvicennia marina var acutissima dan Bruguiera parviflora didedahkan kepada 2 perlakuan air pasang; dalam dan cetek; selama 6 bulan. Perlakuan cetek mewakili keadaan semasa sementara perlakuan dalam mewakili keadaan kenaikan aras air laut pada masa hadapan. Perlakuan dalam mengurangkan nilai Amax untuk kedua-dua spesis. Nilai A400 menurun dengan bererti bagi B. parviflora tetapi tidak A. marina untuk perlakuan dalam. Titik imbangan karbon dioksida tidak dipengaruhi oleh perlakuan air pasang tetapi menunjukkan perbezaan bererti antara kedua-dua spesis. Nisbah A400/Amax adalah rendah pada perlakuan cetek B. parviflorayang menandakan potensi sinki karbon yang lebih tinggi manakala nisbah A400/Amax bagi A. marina kurang menunujukkan variasi. Konduktans klorofil tidak sensitif terhadap air pasang namun B. parviflora menunjukkan nilai lebih tinggi berbanding A. marina. Sekuestrasi karbon B. parvifloramenurun pada perlakuan dalam tetapi tidak begitu ketara pada A. marina. Kesemua keputusan menunjukkanA. marina lebih toleren terhadap kenaikan aras air laut berbandingB. parviflora.


Kata kunci: Kebanjiran; kegenangan air; paya bakau; pertumbuhan biji benih; perubahan iklim


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